/* * tkImgPhoto.c -- * * Implements images of type "photo" for Tk. Photo images are * stored in full color (24 bits per pixel) and displayed using * dithering if necessary. * * Copyright (c) 1994 The Australian National University. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * Author: Paul Mackerras (paulus@cs.anu.edu.au), * Department of Computer Science, * Australian National University. * * SCCS: @(#) tkImgPhoto.c 1.60 97/08/08 11:32:46 */ #include "tkInt.h" #include "tkPort.h" #ifdef SCM_CODE # include #else # include "tclMath.h" #endif #include /* * Declaration for internal Xlib function used here: */ #ifdef SCM_CODE extern int _XInitImageFuncPtrs _ANSI_ARGS_((XImage *image)); #else extern _XInitImageFuncPtrs _ANSI_ARGS_((XImage *image)); #endif /* * A signed 8-bit integral type. If chars are unsigned and the compiler * isn't an ANSI one, then we have to use short instead (which wastes * space) to get signed behavior. */ #if defined(__STDC__) || defined(_AIX) typedef signed char schar; #else # ifndef __CHAR_UNSIGNED__ typedef char schar; # else typedef short schar; # endif #endif /* * An unsigned 32-bit integral type, used for pixel values. * We use int rather than long here to accommodate those systems * where longs are 64 bits. */ typedef unsigned int pixel; /* * The maximum number of pixels to transmit to the server in a * single XPutImage call. */ #define MAX_PIXELS 65536 /* * The set of colors required to display a photo image in a window depends on: * - the visual used by the window * - the palette, which specifies how many levels of each primary * color to use, and * - the gamma value for the image. * * Pixel values allocated for specific colors are valid only for the * colormap in which they were allocated. Sets of pixel values * allocated for displaying photos are re-used in other windows if * possible, that is, if the display, colormap, palette and gamma * values match. A hash table is used to locate these sets of pixel * values, using the following data structure as key: */ typedef struct { Display *display; /* Qualifies the colormap resource ID */ Colormap colormap; /* Colormap that the windows are using. */ double gamma; /* Gamma exponent value for images. */ Tk_Uid palette; /* Specifies how many shades of each primary * we want to allocate. */ } ColorTableId; /* * For a particular (display, colormap, palette, gamma) combination, * a data structure of the following type is used to store the allocated * pixel values and other information: */ typedef struct ColorTable { ColorTableId id; /* Information used in selecting this * color table. */ int flags; /* See below. */ int refCount; /* Number of instances using this map. */ int liveRefCount; /* Number of instances which are actually * in use, using this map. */ int numColors; /* Number of colors allocated for this map. */ XVisualInfo visualInfo; /* Information about the visual for windows * using this color table. */ pixel redValues[256]; /* Maps 8-bit values of red intensity * to a pixel value or index in pixelMap. */ pixel greenValues[256]; /* Ditto for green intensity */ pixel blueValues[256]; /* Ditto for blue intensity */ unsigned long *pixelMap; /* Actual pixel values allocated. */ unsigned char colorQuant[3][256]; /* Maps 8-bit intensities to quantized * intensities. The first index is 0 for * red, 1 for green, 2 for blue. */ } ColorTable; /* * Bit definitions for the flags field of a ColorTable. * BLACK_AND_WHITE: 1 means only black and white colors are * available. * COLOR_WINDOW: 1 means a full 3-D color cube has been * allocated. * DISPOSE_PENDING: 1 means a call to DisposeColorTable has * been scheduled as an idle handler, but it * hasn't been invoked yet. * MAP_COLORS: 1 means pixel values should be mapped * through pixelMap. */ #define BLACK_AND_WHITE 1 #define COLOR_WINDOW 2 #define DISPOSE_PENDING 4 #define MAP_COLORS 8 /* * Definition of the data associated with each photo image master. */ typedef struct PhotoMaster { Tk_ImageMaster tkMaster; /* Tk's token for image master. NULL means * the image is being deleted. */ Tcl_Interp *interp; /* Interpreter associated with the * application using this image. */ Tcl_Command imageCmd; /* Token for image command (used to delete * it when the image goes away). NULL means * the image command has already been * deleted. */ int flags; /* Sundry flags, defined below. */ int width, height; /* Dimensions of image. */ int userWidth, userHeight; /* User-declared image dimensions. */ Tk_Uid palette; /* User-specified default palette for * instances of this image. */ double gamma; /* Display gamma value to correct for. */ char *fileString; /* Name of file to read into image. */ char *dataString; /* String value to use as contents of image. */ char *format; /* User-specified format of data in image * file or string value. */ unsigned char *pix24; /* Local storage for 24-bit image. */ int ditherX, ditherY; /* Location of first incorrectly * dithered pixel in image. */ TkRegion validRegion; /* Tk region indicating which parts of * the image have valid image data. */ struct PhotoInstance *instancePtr; /* First in the list of instances * associated with this master. */ } PhotoMaster; /* * Bit definitions for the flags field of a PhotoMaster. * COLOR_IMAGE: 1 means that the image has different color * components. * IMAGE_CHANGED: 1 means that the instances of this image * need to be redithered. */ #define COLOR_IMAGE 1 #define IMAGE_CHANGED 2 /* * The following data structure represents all of the instances of * a photo image in windows on a given screen that are using the * same colormap. */ typedef struct PhotoInstance { PhotoMaster *masterPtr; /* Pointer to master for image. */ Display *display; /* Display for windows using this instance. */ Colormap colormap; /* The image may only be used in windows with * this particular colormap. */ struct PhotoInstance *nextPtr; /* Pointer to the next instance in the list * of instances associated with this master. */ int refCount; /* Number of instances using this structure. */ Tk_Uid palette; /* Palette for these particular instances. */ double gamma; /* Gamma value for these instances. */ Tk_Uid defaultPalette; /* Default palette to use if a palette * is not specified for the master. */ ColorTable *colorTablePtr; /* Pointer to information about colors * allocated for image display in windows * like this one. */ Pixmap pixels; /* X pixmap containing dithered image. */ int width, height; /* Dimensions of the pixmap. */ schar *error; /* Error image, used in dithering. */ XImage *imagePtr; /* Image structure for converted pixels. */ XVisualInfo visualInfo; /* Information about the visual that these * windows are using. */ GC gc; /* Graphics context for writing images * to the pixmap. */ } PhotoInstance; /* * The following data structure is used to return information * from ParseSubcommandOptions: */ struct SubcommandOptions { int options; /* Individual bits indicate which * options were specified - see below. */ char *name; /* Name specified without an option. */ int fromX, fromY; /* Values specified for -from option. */ int fromX2, fromY2; /* Second coordinate pair for -from option. */ int toX, toY; /* Values specified for -to option. */ int toX2, toY2; /* Second coordinate pair for -to option. */ int zoomX, zoomY; /* Values specified for -zoom option. */ int subsampleX, subsampleY; /* Values specified for -subsample option. */ char *format; /* Value specified for -format option. */ }; /* * Bit definitions for use with ParseSubcommandOptions: * Each bit is set in the allowedOptions parameter on a call to * ParseSubcommandOptions if that option is allowed for the current * photo image subcommand. On return, the bit is set in the options * field of the SubcommandOptions structure if that option was specified. * * OPT_FORMAT: Set if -format option allowed/specified. * OPT_FROM: Set if -from option allowed/specified. * OPT_SHRINK: Set if -shrink option allowed/specified. * OPT_SUBSAMPLE: Set if -subsample option allowed/spec'd. * OPT_TO: Set if -to option allowed/specified. * OPT_ZOOM: Set if -zoom option allowed/specified. */ #define OPT_FORMAT 1 #define OPT_FROM 2 #define OPT_SHRINK 4 #define OPT_SUBSAMPLE 8 #define OPT_TO 0x10 #define OPT_ZOOM 0x20 /* * List of option names. The order here must match the order of * declarations of the OPT_* constants above. */ static char *optionNames[] = { "-format", "-from", "-shrink", "-subsample", "-to", "-zoom", (char *) NULL }; /* * The type record for photo images: */ static int ImgPhotoCreate _ANSI_ARGS_((Tcl_Interp *interp, char *name, int argc, char **argv, Tk_ImageType *typePtr, Tk_ImageMaster master, ClientData *clientDataPtr)); static ClientData ImgPhotoGet _ANSI_ARGS_((Tk_Window tkwin, ClientData clientData)); static void ImgPhotoDisplay _ANSI_ARGS_((ClientData clientData, Display *display, Drawable drawable, int imageX, int imageY, int width, int height, int drawableX, int drawableY)); static void ImgPhotoFree _ANSI_ARGS_((ClientData clientData, Display *display)); static void ImgPhotoDelete _ANSI_ARGS_((ClientData clientData)); Tk_ImageType tkPhotoImageType = { "photo", /* name */ ImgPhotoCreate, /* createProc */ ImgPhotoGet, /* getProc */ ImgPhotoDisplay, /* displayProc */ ImgPhotoFree, /* freeProc */ ImgPhotoDelete, /* deleteProc */ (Tk_ImageType *) NULL /* nextPtr */ }; /* * Default configuration */ #define DEF_PHOTO_GAMMA "1" #define DEF_PHOTO_HEIGHT "0" #define DEF_PHOTO_PALETTE "" #define DEF_PHOTO_WIDTH "0" /* * Information used for parsing configuration specifications: */ static Tk_ConfigSpec configSpecs[] = { {TK_CONFIG_STRING, "-data", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(PhotoMaster, dataString), TK_CONFIG_NULL_OK}, {TK_CONFIG_STRING, "-format", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(PhotoMaster, format), TK_CONFIG_NULL_OK}, {TK_CONFIG_STRING, "-file", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(PhotoMaster, fileString), TK_CONFIG_NULL_OK}, {TK_CONFIG_DOUBLE, "-gamma", (char *) NULL, (char *) NULL, DEF_PHOTO_GAMMA, Tk_Offset(PhotoMaster, gamma), 0}, {TK_CONFIG_INT, "-height", (char *) NULL, (char *) NULL, DEF_PHOTO_HEIGHT, Tk_Offset(PhotoMaster, userHeight), 0}, {TK_CONFIG_UID, "-palette", (char *) NULL, (char *) NULL, DEF_PHOTO_PALETTE, Tk_Offset(PhotoMaster, palette), 0}, {TK_CONFIG_INT, "-width", (char *) NULL, (char *) NULL, DEF_PHOTO_WIDTH, Tk_Offset(PhotoMaster, userWidth), 0}, {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, (char *) NULL, 0, 0} }; /* * Hash table used to hash from (display, colormap, palette, gamma) * to ColorTable address. */ static Tcl_HashTable imgPhotoColorHash; static int imgPhotoColorHashInitialized; #define N_COLOR_HASH (sizeof(ColorTableId) / sizeof(int)) /* * Pointer to the first in the list of known photo image formats. */ static Tk_PhotoImageFormat *formatList = NULL; /* * Forward declarations */ static int ImgPhotoCmd _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, int argc, char **argv)); static int ParseSubcommandOptions _ANSI_ARGS_(( struct SubcommandOptions *optPtr, Tcl_Interp *interp, int allowedOptions, int *indexPtr, int argc, char **argv)); static void ImgPhotoCmdDeletedProc _ANSI_ARGS_(( ClientData clientData)); static int ImgPhotoConfigureMaster _ANSI_ARGS_(( Tcl_Interp *interp, PhotoMaster *masterPtr, int argc, char **argv, int flags)); static void ImgPhotoConfigureInstance _ANSI_ARGS_(( PhotoInstance *instancePtr)); static void ImgPhotoSetSize _ANSI_ARGS_((PhotoMaster *masterPtr, int width, int height)); static void ImgPhotoInstanceSetSize _ANSI_ARGS_(( PhotoInstance *instancePtr)); static int IsValidPalette _ANSI_ARGS_((PhotoInstance *instancePtr, char *palette)); static int CountBits _ANSI_ARGS_((pixel mask)); static void GetColorTable _ANSI_ARGS_((PhotoInstance *instancePtr)); static void FreeColorTable _ANSI_ARGS_((ColorTable *colorPtr)); static void AllocateColors _ANSI_ARGS_((ColorTable *colorPtr)); static void DisposeColorTable _ANSI_ARGS_((ClientData clientData)); static void DisposeInstance _ANSI_ARGS_((ClientData clientData)); static int ReclaimColors _ANSI_ARGS_((ColorTableId *id, int numColors)); static int MatchFileFormat _ANSI_ARGS_((Tcl_Interp *interp, Tcl_Channel chan, char *fileName, char *formatString, Tk_PhotoImageFormat **imageFormatPtr, int *widthPtr, int *heightPtr)); static int MatchStringFormat _ANSI_ARGS_((Tcl_Interp *interp, char *string, char *formatString, Tk_PhotoImageFormat **imageFormatPtr, int *widthPtr, int *heightPtr)); static void Dither _ANSI_ARGS_((PhotoMaster *masterPtr, int x, int y, int width, int height)); static void DitherInstance _ANSI_ARGS_((PhotoInstance *instancePtr, int x, int y, int width, int height)); #undef MIN #define MIN(a, b) ((a) < (b)? (a): (b)) #undef MAX #define MAX(a, b) ((a) > (b)? (a): (b)) /* *---------------------------------------------------------------------- * * Tk_CreatePhotoImageFormat -- * * This procedure is invoked by an image file handler to register * a new photo image format and the procedures that handle the * new format. The procedure is typically invoked during * Tcl_AppInit. * * Results: * None. * * Side effects: * The new image file format is entered into a table used in the * photo image "read" and "write" subcommands. * *---------------------------------------------------------------------- */ void Tk_CreatePhotoImageFormat(formatPtr) Tk_PhotoImageFormat *formatPtr; /* Structure describing the format. All of * the fields except "nextPtr" must be filled * in by caller. Must not have been passed * to Tk_CreatePhotoImageFormat previously. */ { Tk_PhotoImageFormat *copyPtr; copyPtr = (Tk_PhotoImageFormat *) ckalloc(sizeof(Tk_PhotoImageFormat)); *copyPtr = *formatPtr; copyPtr->name = (char *) ckalloc((unsigned) (strlen(formatPtr->name) + 1)); strcpy(copyPtr->name, formatPtr->name); copyPtr->nextPtr = formatList; formatList = copyPtr; } /* *---------------------------------------------------------------------- * * ImgPhotoCreate -- * * This procedure is called by the Tk image code to create * a new photo image. * * Results: * A standard Tcl result. * * Side effects: * The data structure for a new photo image is allocated and * initialized. * *---------------------------------------------------------------------- */ static int ImgPhotoCreate(interp, name, argc, argv, typePtr, master, clientDataPtr) Tcl_Interp *interp; /* Interpreter for application containing * image. */ char *name; /* Name to use for image. */ int argc; /* Number of arguments. */ char **argv; /* Argument strings for options (doesn't * include image name or type). */ Tk_ImageType *typePtr; /* Pointer to our type record (not used). */ Tk_ImageMaster master; /* Token for image, to be used by us in * later callbacks. */ ClientData *clientDataPtr; /* Store manager's token for image here; * it will be returned in later callbacks. */ { PhotoMaster *masterPtr; /* * Allocate and initialize the photo image master record. */ masterPtr = (PhotoMaster *) ckalloc(sizeof(PhotoMaster)); memset((void *) masterPtr, 0, sizeof(PhotoMaster)); masterPtr->tkMaster = master; masterPtr->interp = interp; masterPtr->imageCmd = Tcl_CreateCommand(interp, name, ImgPhotoCmd, (ClientData) masterPtr, ImgPhotoCmdDeletedProc); masterPtr->palette = NULL; masterPtr->pix24 = NULL; masterPtr->instancePtr = NULL; masterPtr->validRegion = TkCreateRegion(); /* * Process configuration options given in the image create command. */ if (ImgPhotoConfigureMaster(interp, masterPtr, argc, argv, 0) != TCL_OK) { ImgPhotoDelete((ClientData) masterPtr); return TCL_ERROR; } *clientDataPtr = (ClientData) masterPtr; return TCL_OK; } /* *---------------------------------------------------------------------- * * ImgPhotoCmd -- * * This procedure is invoked to process the Tcl command that * corresponds to a photo image. See the user documentation * for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ImgPhotoCmd(clientData, interp, argc, argv) ClientData clientData; /* Information about photo master. */ Tcl_Interp *interp; /* Current interpreter. */ int argc; /* Number of arguments. */ char **argv; /* Argument strings. */ { PhotoMaster *masterPtr = (PhotoMaster *) clientData; int c, result, index; int x, y, width, height; int dataWidth, dataHeight; struct SubcommandOptions options; int listArgc; char **listArgv; char **srcArgv; unsigned char *pixelPtr; Tk_PhotoImageBlock block; Tk_Window tkwin; char string[16]; XColor color; Tk_PhotoImageFormat *imageFormat; int imageWidth, imageHeight; int matched; Tcl_Channel chan; Tk_PhotoHandle srcHandle; size_t length; if (argc < 2) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " option ?arg arg ...?\"", (char *) NULL); return TCL_ERROR; } c = argv[1][0]; length = strlen(argv[1]); if ((c == 'b') && (strncmp(argv[1], "blank", length) == 0)) { /* * photo blank command - just call Tk_PhotoBlank. */ if (argc == 2) { Tk_PhotoBlank(masterPtr); } else { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " blank\"", (char *) NULL); return TCL_ERROR; } } else if ((c == 'c') && (length >= 2) && (strncmp(argv[1], "cget", length) == 0)) { if (argc != 3) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " cget option\"", (char *) NULL); return TCL_ERROR; } Tk_ConfigureValue(interp, Tk_MainWindow(interp), configSpecs, (char *) masterPtr, argv[2], 0); } else if ((c == 'c') && (length >= 3) && (strncmp(argv[1], "configure", length) == 0)) { /* * photo configure command - handle this in the standard way. */ if (argc == 2) { return Tk_ConfigureInfo(interp, Tk_MainWindow(interp), configSpecs, (char *) masterPtr, (char *) NULL, 0); } if (argc == 3) { return Tk_ConfigureInfo(interp, Tk_MainWindow(interp), configSpecs, (char *) masterPtr, argv[2], 0); } return ImgPhotoConfigureMaster(interp, masterPtr, argc-2, argv+2, TK_CONFIG_ARGV_ONLY); } else if ((c == 'c') && (length >= 3) && (strncmp(argv[1], "copy", length) == 0)) { /* * photo copy command - first parse options. */ index = 2; memset((VOID *) &options, 0, sizeof(options)); options.zoomX = options.zoomY = 1; options.subsampleX = options.subsampleY = 1; options.name = NULL; if (ParseSubcommandOptions(&options, interp, OPT_FROM | OPT_TO | OPT_ZOOM | OPT_SUBSAMPLE | OPT_SHRINK, &index, argc, argv) != TCL_OK) { return TCL_ERROR; } if (options.name == NULL || index < argc) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " copy source-image ?-from x1 y1 x2 y2?", " ?-to x1 y1 x2 y2? ?-zoom x y? ?-subsample x y?", "\"", (char *) NULL); return TCL_ERROR; } /* * Look for the source image and get a pointer to its image data. * Check the values given for the -from option. */ if ((srcHandle = Tk_FindPhoto(interp, options.name)) == NULL) { Tcl_AppendResult(interp, "image \"", argv[2], "\" doesn't", " exist or is not a photo image", (char *) NULL); return TCL_ERROR; } Tk_PhotoGetImage(srcHandle, &block); if ((options.fromX2 > block.width) || (options.fromY2 > block.height) || (options.fromX2 > block.width) || (options.fromY2 > block.height)) { Tcl_AppendResult(interp, "coordinates for -from option extend ", "outside source image", (char *) NULL); return TCL_ERROR; } /* * Fill in default values for unspecified parameters. */ if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) { options.fromX2 = block.width; options.fromY2 = block.height; } if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) { width = options.fromX2 - options.fromX; if (options.subsampleX > 0) { width = (width + options.subsampleX - 1) / options.subsampleX; } else if (options.subsampleX == 0) { width = 0; } else { width = (width - options.subsampleX - 1) / -options.subsampleX; } options.toX2 = options.toX + width * options.zoomX; height = options.fromY2 - options.fromY; if (options.subsampleY > 0) { height = (height + options.subsampleY - 1) / options.subsampleY; } else if (options.subsampleY == 0) { height = 0; } else { height = (height - options.subsampleY - 1) / -options.subsampleY; } options.toY2 = options.toY + height * options.zoomY; } /* * Set the destination image size if the -shrink option was specified. */ if (options.options & OPT_SHRINK) { ImgPhotoSetSize(masterPtr, options.toX2, options.toY2); } /* * Copy the image data over using Tk_PhotoPutZoomedBlock. */ block.pixelPtr += options.fromX * block.pixelSize + options.fromY * block.pitch; block.width = options.fromX2 - options.fromX; block.height = options.fromY2 - options.fromY; Tk_PhotoPutZoomedBlock((Tk_PhotoHandle) masterPtr, &block, options.toX, options.toY, options.toX2 - options.toX, options.toY2 - options.toY, options.zoomX, options.zoomY, options.subsampleX, options.subsampleY); } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) { /* * photo get command - first parse and check parameters. */ if (argc != 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " get x y\"", (char *) NULL); return TCL_ERROR; } if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK) || (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) { return TCL_ERROR; } if ((x < 0) || (x >= masterPtr->width) || (y < 0) || (y >= masterPtr->height)) { Tcl_AppendResult(interp, argv[0], " get: ", "coordinates out of range", (char *) NULL); return TCL_ERROR; } /* * Extract the value of the desired pixel and format it as a string. */ pixelPtr = masterPtr->pix24 + (y * masterPtr->width + x) * 3; sprintf(string, "%d %d %d", pixelPtr[0], pixelPtr[1], pixelPtr[2]); Tcl_AppendResult(interp, string, (char *) NULL); } else if ((c == 'p') && (strncmp(argv[1], "put", length) == 0)) { /* * photo put command - first parse the options and colors specified. */ index = 2; memset((VOID *) &options, 0, sizeof(options)); options.name = NULL; if (ParseSubcommandOptions(&options, interp, OPT_TO, &index, argc, argv) != TCL_OK) { return TCL_ERROR; } if ((options.name == NULL) || (index < argc)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " put {{colors...}...} ?-to x1 y1 x2 y2?\"", (char *) NULL); return TCL_ERROR; } if (Tcl_SplitList(interp, options.name, &dataHeight, &srcArgv) != TCL_OK) { return TCL_ERROR; } tkwin = Tk_MainWindow(interp); block.pixelPtr = NULL; dataWidth = 0; pixelPtr = NULL; for (y = 0; y < dataHeight; ++y) { if (Tcl_SplitList(interp, srcArgv[y], &listArgc, &listArgv) != TCL_OK) { break; } if (y == 0) { dataWidth = listArgc; pixelPtr = (unsigned char *) ckalloc((unsigned) dataWidth * dataHeight * 3); block.pixelPtr = pixelPtr; } else { if (listArgc != dataWidth) { Tcl_AppendResult(interp, "all elements of color list must", " have the same number of elements", (char *) NULL); ckfree((char *) listArgv); break; } } for (x = 0; x < dataWidth; ++x) { if (!XParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin), listArgv[x], &color)) { Tcl_AppendResult(interp, "can't parse color \"", listArgv[x], "\"", (char *) NULL); break; } *pixelPtr++ = color.red >> 8; *pixelPtr++ = color.green >> 8; *pixelPtr++ = color.blue >> 8; } ckfree((char *) listArgv); if (x < dataWidth) break; } ckfree((char *) srcArgv); if (y < dataHeight || dataHeight == 0 || dataWidth == 0) { if (block.pixelPtr != NULL) { ckfree((char *) block.pixelPtr); } if (y < dataHeight) { return TCL_ERROR; } return TCL_OK; } /* * Fill in default values for the -to option, then * copy the block in using Tk_PhotoPutBlock. */ if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) { options.toX2 = options.toX + dataWidth; options.toY2 = options.toY + dataHeight; } block.width = dataWidth; block.height = dataHeight; block.pitch = dataWidth * 3; block.pixelSize = 3; block.offset[0] = 0; block.offset[1] = 1; block.offset[2] = 2; Tk_PhotoPutBlock((ClientData)masterPtr, &block, options.toX, options.toY, options.toX2 - options.toX, options.toY2 - options.toY); ckfree((char *) block.pixelPtr); } else if ((c == 'r') && (length >= 3) && (strncmp(argv[1], "read", length) == 0)) { /* * photo read command - first parse the options specified. */ index = 2; memset((VOID *) &options, 0, sizeof(options)); options.name = NULL; options.format = NULL; if (ParseSubcommandOptions(&options, interp, OPT_FORMAT | OPT_FROM | OPT_TO | OPT_SHRINK, &index, argc, argv) != TCL_OK) { return TCL_ERROR; } if ((options.name == NULL) || (index < argc)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " read fileName ?-format format-name?", " ?-from x1 y1 x2 y2? ?-to x y? ?-shrink?\"", (char *) NULL); return TCL_ERROR; } /* * Prevent file system access in safe interpreters. */ if (Tcl_IsSafe(interp)) { Tcl_AppendResult(interp, "can't get image from a file in a", " safe interpreter", (char *) NULL); return TCL_ERROR; } /* * Open the image file and look for a handler for it. */ chan = Tcl_OpenFileChannel(interp, options.name, "r", 0); if (chan == NULL) { return TCL_ERROR; } if (Tcl_SetChannelOption(interp, chan, "-translation", "binary") != TCL_OK) { return TCL_ERROR; } if (MatchFileFormat(interp, chan, options.name, options.format, &imageFormat, &imageWidth, &imageHeight) != TCL_OK) { Tcl_Close(NULL, chan); return TCL_ERROR; } /* * Check the values given for the -from option. */ if ((options.fromX > imageWidth) || (options.fromY > imageHeight) || (options.fromX2 > imageWidth) || (options.fromY2 > imageHeight)) { Tcl_AppendResult(interp, "coordinates for -from option extend ", "outside source image", (char *) NULL); Tcl_Close(NULL, chan); return TCL_ERROR; } if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) { width = imageWidth - options.fromX; height = imageHeight - options.fromY; } else { width = options.fromX2 - options.fromX; height = options.fromY2 - options.fromY; } /* * If the -shrink option was specified, set the size of the image. */ if (options.options & OPT_SHRINK) { ImgPhotoSetSize(masterPtr, options.toX + width, options.toY + height); } /* * Call the handler's file read procedure to read the data * into the image. */ result = (*imageFormat->fileReadProc)(interp, chan, options.name, options.format, (Tk_PhotoHandle) masterPtr, options.toX, options.toY, width, height, options.fromX, options.fromY); if (chan != NULL) { Tcl_Close(NULL, chan); } return result; } else if ((c == 'r') && (length >= 3) && (strncmp(argv[1], "redither", length) == 0)) { if (argc == 2) { /* * Call Dither if any part of the image is not correctly * dithered at present. */ x = masterPtr->ditherX; y = masterPtr->ditherY; if (masterPtr->ditherX != 0) { Dither(masterPtr, x, y, masterPtr->width - x, 1); } if (masterPtr->ditherY < masterPtr->height) { x = 0; Dither(masterPtr, 0, masterPtr->ditherY, masterPtr->width, masterPtr->height - masterPtr->ditherY); } if (y < masterPtr->height) { /* * Tell the core image code that part of the image has changed. */ Tk_ImageChanged(masterPtr->tkMaster, x, y, (masterPtr->width - x), (masterPtr->height - y), masterPtr->width, masterPtr->height); } } else { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " redither\"", (char *) NULL); return TCL_ERROR; } } else if ((c == 'w') && (strncmp(argv[1], "write", length) == 0)) { /* * Prevent file system access in safe interpreters. */ if (Tcl_IsSafe(interp)) { Tcl_AppendResult(interp, "can't write image to a file in a", " safe interpreter", (char *) NULL); return TCL_ERROR; } /* * photo write command - first parse and check any options given. */ index = 2; memset((VOID *) &options, 0, sizeof(options)); options.name = NULL; options.format = NULL; if (ParseSubcommandOptions(&options, interp, OPT_FORMAT | OPT_FROM, &index, argc, argv) != TCL_OK) { return TCL_ERROR; } if ((options.name == NULL) || (index < argc)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " write fileName ?-format format-name?", "?-from x1 y1 x2 y2?\"", (char *) NULL); return TCL_ERROR; } if ((options.fromX > masterPtr->width) || (options.fromY > masterPtr->height) || (options.fromX2 > masterPtr->width) || (options.fromY2 > masterPtr->height)) { Tcl_AppendResult(interp, "coordinates for -from option extend ", "outside image", (char *) NULL); return TCL_ERROR; } /* * Fill in default values for unspecified parameters. */ if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) { options.fromX2 = masterPtr->width; options.fromY2 = masterPtr->height; } /* * Search for an appropriate image file format handler, * and give an error if none is found. */ matched = 0; for (imageFormat = formatList; imageFormat != NULL; imageFormat = imageFormat->nextPtr) { if ((options.format == NULL) || (strncasecmp(options.format, imageFormat->name, strlen(imageFormat->name)) == 0)) { matched = 1; if (imageFormat->fileWriteProc != NULL) { break; } } } if (imageFormat == NULL) { if (options.format == NULL) { Tcl_AppendResult(interp, "no available image file format ", "has file writing capability", (char *) NULL); } else if (!matched) { Tcl_AppendResult(interp, "image file format \"", options.format, "\" is unknown", (char *) NULL); } else { Tcl_AppendResult(interp, "image file format \"", options.format, "\" has no file writing capability", (char *) NULL); } return TCL_ERROR; } /* * Call the handler's file write procedure to write out * the image. */ Tk_PhotoGetImage((Tk_PhotoHandle) masterPtr, &block); block.pixelPtr += options.fromY * block.pitch + options.fromX * 3; block.width = options.fromX2 - options.fromX; block.height = options.fromY2 - options.fromY; return (*imageFormat->fileWriteProc)(interp, options.name, options.format, &block); } else { Tcl_AppendResult(interp, "bad option \"", argv[1], "\": must be blank, cget, configure, copy, get, put,", " read, redither, or write", (char *) NULL); return TCL_ERROR; } return TCL_OK; } /* *---------------------------------------------------------------------- * * ParseSubcommandOptions -- * * This procedure is invoked to process one of the options * which may be specified for the photo image subcommands, * namely, -from, -to, -zoom, -subsample, -format, and -shrink. * * Results: * A standard Tcl result. * * Side effects: * Fields in *optPtr get filled in. * *---------------------------------------------------------------------- */ static int ParseSubcommandOptions(optPtr, interp, allowedOptions, optIndexPtr, argc, argv) struct SubcommandOptions *optPtr; /* Information about the options specified * and the values given is returned here. */ Tcl_Interp *interp; /* Interpreter to use for reporting errors. */ int allowedOptions; /* Indicates which options are valid for * the current command. */ int *optIndexPtr; /* Points to a variable containing the * current index in argv; this variable is * updated by this procedure. */ int argc; /* Number of arguments in argv[]. */ char **argv; /* Arguments to be parsed. */ { int index, c, bit, currentBit; size_t length; char *option, **listPtr; int values[4]; int numValues, maxValues, argIndex; for (index = *optIndexPtr; index < argc; *optIndexPtr = ++index) { /* * We can have one value specified without an option; * it goes into optPtr->name. */ option = argv[index]; if (option[0] != '-') { if (optPtr->name == NULL) { optPtr->name = option; continue; } break; } /* * Work out which option this is. */ length = strlen(option); c = option[0]; bit = 0; currentBit = 1; for (listPtr = optionNames; *listPtr != NULL; ++listPtr) { if ((c == *listPtr[0]) && (strncmp(option, *listPtr, length) == 0)) { if (bit != 0) { bit = 0; /* An ambiguous option. */ break; } bit = currentBit; } currentBit <<= 1; } /* * If this option is not recognized and allowed, put * an error message in the interpreter and return. */ if ((allowedOptions & bit) == 0) { Tcl_AppendResult(interp, "unrecognized option \"", argv[index], "\": must be ", (char *)NULL); bit = 1; for (listPtr = optionNames; *listPtr != NULL; ++listPtr) { if ((allowedOptions & bit) != 0) { if ((allowedOptions & (bit - 1)) != 0) { Tcl_AppendResult(interp, ", ", (char *) NULL); if ((allowedOptions & ~((bit << 1) - 1)) == 0) { Tcl_AppendResult(interp, "or ", (char *) NULL); } } Tcl_AppendResult(interp, *listPtr, (char *) NULL); } bit <<= 1; } return TCL_ERROR; } /* * For the -from, -to, -zoom and -subsample options, * parse the values given. Report an error if too few * or too many values are given. */ if ((bit != OPT_SHRINK) && (bit != OPT_FORMAT)) { maxValues = ((bit == OPT_FROM) || (bit == OPT_TO))? 4: 2; argIndex = index + 1; for (numValues = 0; numValues < maxValues; ++numValues) { if ((argIndex < argc) && (isdigit(UCHAR(argv[argIndex][0])) || ((argv[argIndex][0] == '-') && (isdigit(UCHAR(argv[argIndex][1])))))) { if (Tcl_GetInt(interp, argv[argIndex], &values[numValues]) != TCL_OK) { return TCL_ERROR; } } else { break; } ++argIndex; } if (numValues == 0) { Tcl_AppendResult(interp, "the \"", argv[index], "\" option ", "requires one ", maxValues == 2? "or two": "to four", " integer values", (char *) NULL); return TCL_ERROR; } *optIndexPtr = (index += numValues); /* * Y values default to the corresponding X value if not specified. */ if (numValues == 1) { values[1] = values[0]; } if (numValues == 3) { values[3] = values[2]; } /* * Check the values given and put them in the appropriate * field of the SubcommandOptions structure. */ switch (bit) { case OPT_FROM: if ((values[0] < 0) || (values[1] < 0) || ((numValues > 2) && ((values[2] < 0) || (values[3] < 0)))) { Tcl_AppendResult(interp, "value(s) for the -from", " option must be non-negative", (char *) NULL); return TCL_ERROR; } if (numValues <= 2) { optPtr->fromX = values[0]; optPtr->fromY = values[1]; optPtr->fromX2 = -1; optPtr->fromY2 = -1; } else { optPtr->fromX = MIN(values[0], values[2]); optPtr->fromY = MIN(values[1], values[3]); optPtr->fromX2 = MAX(values[0], values[2]); optPtr->fromY2 = MAX(values[1], values[3]); } break; case OPT_SUBSAMPLE: optPtr->subsampleX = values[0]; optPtr->subsampleY = values[1]; break; case OPT_TO: if ((values[0] < 0) || (values[1] < 0) || ((numValues > 2) && ((values[2] < 0) || (values[3] < 0)))) { Tcl_AppendResult(interp, "value(s) for the -to", " option must be non-negative", (char *) NULL); return TCL_ERROR; } if (numValues <= 2) { optPtr->toX = values[0]; optPtr->toY = values[1]; optPtr->toX2 = -1; optPtr->toY2 = -1; } else { optPtr->toX = MIN(values[0], values[2]); optPtr->toY = MIN(values[1], values[3]); optPtr->toX2 = MAX(values[0], values[2]); optPtr->toY2 = MAX(values[1], values[3]); } break; case OPT_ZOOM: if ((values[0] <= 0) || (values[1] <= 0)) { Tcl_AppendResult(interp, "value(s) for the -zoom", " option must be positive", (char *) NULL); return TCL_ERROR; } optPtr->zoomX = values[0]; optPtr->zoomY = values[1]; break; } } else if (bit == OPT_FORMAT) { /* * The -format option takes a single string value. */ if (index + 1 < argc) { *optIndexPtr = ++index; optPtr->format = argv[index]; } else { Tcl_AppendResult(interp, "the \"-format\" option ", "requires a value", (char *) NULL); return TCL_ERROR; } } /* * Remember that we saw this option. */ optPtr->options |= bit; } return TCL_OK; } /* *---------------------------------------------------------------------- * * ImgPhotoConfigureMaster -- * * This procedure is called when a photo image is created or * reconfigured. It processes configuration options and resets * any instances of the image. * * Results: * A standard Tcl return value. If TCL_ERROR is returned then * an error message is left in masterPtr->interp->result. * * Side effects: * Existing instances of the image will be redisplayed to match * the new configuration options. * *---------------------------------------------------------------------- */ static int ImgPhotoConfigureMaster(interp, masterPtr, argc, argv, flags) Tcl_Interp *interp; /* Interpreter to use for reporting errors. */ PhotoMaster *masterPtr; /* Pointer to data structure describing * overall photo image to (re)configure. */ int argc; /* Number of entries in argv. */ char **argv; /* Pairs of configuration options for image. */ int flags; /* Flags to pass to Tk_ConfigureWidget, * such as TK_CONFIG_ARGV_ONLY. */ { PhotoInstance *instancePtr; char *oldFileString, *oldDataString, *oldPaletteString; double oldGamma; int result; Tcl_Channel chan; Tk_PhotoImageFormat *imageFormat; int imageWidth, imageHeight; /* * Save the current values for fileString and dataString, so we * can tell if the user specifies them anew. */ oldFileString = masterPtr->fileString; oldDataString = (oldFileString == NULL)? masterPtr->dataString: NULL; oldPaletteString = masterPtr->palette; oldGamma = masterPtr->gamma; /* * Process the configuration options specified. */ if (Tk_ConfigureWidget(interp, Tk_MainWindow(interp), configSpecs, argc, argv, (char *) masterPtr, flags) != TCL_OK) { return TCL_ERROR; } /* * Regard the empty string for -file, -data or -format as the null * value. */ if ((masterPtr->fileString != NULL) && (masterPtr->fileString[0] == 0)) { ckfree(masterPtr->fileString); masterPtr->fileString = NULL; } if ((masterPtr->dataString != NULL) && (masterPtr->dataString[0] == 0)) { ckfree(masterPtr->dataString); masterPtr->dataString = NULL; } if ((masterPtr->format != NULL) && (masterPtr->format[0] == 0)) { ckfree(masterPtr->format); masterPtr->format = NULL; } /* * Set the image to the user-requested size, if any, * and make sure storage is correctly allocated for this image. */ ImgPhotoSetSize(masterPtr, masterPtr->width, masterPtr->height); /* * Read in the image from the file or string if the user has * specified the -file or -data option. */ if ((masterPtr->fileString != NULL) && (masterPtr->fileString != oldFileString)) { /* * Prevent file system access in a safe interpreter. */ if (Tcl_IsSafe(interp)) { Tcl_AppendResult(interp, "can't get image from a file in a", " safe interpreter", (char *) NULL); return TCL_ERROR; } #if defined(SCM_CODE) && defined(WIN32) chan = Tcl_OpenFileChannel(interp, masterPtr->fileString, "rb", 0); #else chan = Tcl_OpenFileChannel(interp, masterPtr->fileString, "r", 0); #endif if (chan == NULL) { return TCL_ERROR; } #ifndef SCM_CODE if (Tcl_SetChannelOption(interp, chan, "-translation", "binary") != TCL_OK) { return TCL_ERROR; } #endif if (MatchFileFormat(interp, chan, masterPtr->fileString, masterPtr->format, &imageFormat, &imageWidth, &imageHeight) != TCL_OK) { Tcl_Close(NULL, chan); return TCL_ERROR; } ImgPhotoSetSize(masterPtr, imageWidth, imageHeight); result = (*imageFormat->fileReadProc)(interp, chan, masterPtr->fileString, masterPtr->format, (Tk_PhotoHandle) masterPtr, 0, 0, imageWidth, imageHeight, 0, 0); Tcl_Close(NULL, chan); if (result != TCL_OK) { return TCL_ERROR; } masterPtr->flags |= IMAGE_CHANGED; } if ((masterPtr->fileString == NULL) && (masterPtr->dataString != NULL) && (masterPtr->dataString != oldDataString)) { if (MatchStringFormat(interp, masterPtr->dataString, masterPtr->format, &imageFormat, &imageWidth, &imageHeight) != TCL_OK) { return TCL_ERROR; } ImgPhotoSetSize(masterPtr, imageWidth, imageHeight); if ((*imageFormat->stringReadProc)(interp, masterPtr->dataString, masterPtr->format, (Tk_PhotoHandle) masterPtr, 0, 0, imageWidth, imageHeight, 0, 0) != TCL_OK) { return TCL_ERROR; } masterPtr->flags |= IMAGE_CHANGED; } /* * Enforce a reasonable value for gamma. */ if (masterPtr->gamma <= 0) { masterPtr->gamma = 1.0; } if ((masterPtr->gamma != oldGamma) || (masterPtr->palette != oldPaletteString)) { masterPtr->flags |= IMAGE_CHANGED; } /* * Cycle through all of the instances of this image, regenerating * the information for each instance. Then force the image to be * redisplayed everywhere that it is used. */ for (instancePtr = masterPtr->instancePtr; instancePtr != NULL; instancePtr = instancePtr->nextPtr) { ImgPhotoConfigureInstance(instancePtr); } /* * Inform the generic image code that the image * has (potentially) changed. */ Tk_ImageChanged(masterPtr->tkMaster, 0, 0, masterPtr->width, masterPtr->height, masterPtr->width, masterPtr->height); masterPtr->flags &= ~IMAGE_CHANGED; return TCL_OK; } /* *---------------------------------------------------------------------- * * ImgPhotoConfigureInstance -- * * This procedure is called to create displaying information for * a photo image instance based on the configuration information * in the master. It is invoked both when new instances are * created and when the master is reconfigured. * * Results: * None. * * Side effects: * Generates errors via Tcl_BackgroundError if there are problems * in setting up the instance. * *---------------------------------------------------------------------- */ static void ImgPhotoConfigureInstance(instancePtr) PhotoInstance *instancePtr; /* Instance to reconfigure. */ { PhotoMaster *masterPtr = instancePtr->masterPtr; XImage *imagePtr; int bitsPerPixel; ColorTable *colorTablePtr; XRectangle validBox; /* * If the -palette configuration option has been set for the master, * use the value specified for our palette, but only if it is * a valid palette for our windows. Use the gamma value specified * the master. */ if ((masterPtr->palette && masterPtr->palette[0]) && IsValidPalette(instancePtr, masterPtr->palette)) { instancePtr->palette = masterPtr->palette; } else { instancePtr->palette = instancePtr->defaultPalette; } instancePtr->gamma = masterPtr->gamma; /* * If we don't currently have a color table, or if the one we * have no longer applies (e.g. because our palette or gamma * has changed), get a new one. */ colorTablePtr = instancePtr->colorTablePtr; if ((colorTablePtr == NULL) || (instancePtr->colormap != colorTablePtr->id.colormap) || (instancePtr->palette != colorTablePtr->id.palette) || (instancePtr->gamma != colorTablePtr->id.gamma)) { /* * Free up our old color table, and get a new one. */ if (colorTablePtr != NULL) { colorTablePtr->liveRefCount -= 1; FreeColorTable(colorTablePtr); } GetColorTable(instancePtr); /* * Create a new XImage structure for sending data to * the X server, if necessary. */ if (instancePtr->colorTablePtr->flags & BLACK_AND_WHITE) { bitsPerPixel = 1; } else { bitsPerPixel = instancePtr->visualInfo.depth; } if ((instancePtr->imagePtr == NULL) || (instancePtr->imagePtr->bits_per_pixel != bitsPerPixel)) { if (instancePtr->imagePtr != NULL) { XFree((char *) instancePtr->imagePtr); } imagePtr = XCreateImage(instancePtr->display, instancePtr->visualInfo.visual, (unsigned) bitsPerPixel, (bitsPerPixel > 1? ZPixmap: XYBitmap), 0, (char *) NULL, 1, 1, 32, 0); instancePtr->imagePtr = imagePtr; /* * Determine the endianness of this machine. * We create images using the local host's endianness, rather * than the endianness of the server; otherwise we would have * to byte-swap any 16 or 32 bit values that we store in the * image in those situations where the server's endianness * is different from ours. */ if (imagePtr != NULL) { union { int i; char c[sizeof(int)]; } kludge; imagePtr->bitmap_unit = sizeof(pixel) * NBBY; kludge.i = 0; kludge.c[0] = 1; imagePtr->byte_order = (kludge.i == 1) ? LSBFirst : MSBFirst; _XInitImageFuncPtrs(imagePtr); } } } /* * If the user has specified a width and/or height for the master * which is different from our current width/height, set the size * to the values specified by the user. If we have no pixmap, we * do this also, since it has the side effect of allocating a * pixmap for us. */ if ((instancePtr->pixels == None) || (instancePtr->error == NULL) || (instancePtr->width != masterPtr->width) || (instancePtr->height != masterPtr->height)) { ImgPhotoInstanceSetSize(instancePtr); } /* * Redither this instance if necessary. */ if ((masterPtr->flags & IMAGE_CHANGED) || (instancePtr->colorTablePtr != colorTablePtr)) { TkClipBox(masterPtr->validRegion, &validBox); if ((validBox.width > 0) && (validBox.height > 0)) { DitherInstance(instancePtr, validBox.x, validBox.y, validBox.width, validBox.height); } } } /* *---------------------------------------------------------------------- * * ImgPhotoGet -- * * This procedure is called for each use of a photo image in a * widget. * * Results: * The return value is a token for the instance, which is passed * back to us in calls to ImgPhotoDisplay and ImgPhotoFree. * * Side effects: * A data structure is set up for the instance (or, an existing * instance is re-used for the new one). * *---------------------------------------------------------------------- */ static ClientData ImgPhotoGet(tkwin, masterData) Tk_Window tkwin; /* Window in which the instance will be * used. */ ClientData masterData; /* Pointer to our master structure for the * image. */ { PhotoMaster *masterPtr = (PhotoMaster *) masterData; PhotoInstance *instancePtr; Colormap colormap; int mono, nRed, nGreen, nBlue; XVisualInfo visualInfo, *visInfoPtr; XRectangle validBox; char buf[16]; int numVisuals; XColor *white, *black; XGCValues gcValues; /* * Table of "best" choices for palette for PseudoColor displays * with between 3 and 15 bits/pixel. */ static int paletteChoice[13][3] = { /* #red, #green, #blue */ {2, 2, 2, /* 3 bits, 8 colors */}, {2, 3, 2, /* 4 bits, 12 colors */}, {3, 4, 2, /* 5 bits, 24 colors */}, {4, 5, 3, /* 6 bits, 60 colors */}, {5, 6, 4, /* 7 bits, 120 colors */}, {7, 7, 4, /* 8 bits, 198 colors */}, {8, 10, 6, /* 9 bits, 480 colors */}, {10, 12, 8, /* 10 bits, 960 colors */}, {14, 15, 9, /* 11 bits, 1890 colors */}, {16, 20, 12, /* 12 bits, 3840 colors */}, {20, 24, 16, /* 13 bits, 7680 colors */}, {26, 30, 20, /* 14 bits, 15600 colors */}, {32, 32, 30, /* 15 bits, 30720 colors */} }; /* * See if there is already an instance for windows using * the same colormap. If so then just re-use it. */ colormap = Tk_Colormap(tkwin); for (instancePtr = masterPtr->instancePtr; instancePtr != NULL; instancePtr = instancePtr->nextPtr) { if ((colormap == instancePtr->colormap) && (Tk_Display(tkwin) == instancePtr->display)) { /* * Re-use this instance. */ if (instancePtr->refCount == 0) { /* * We are resurrecting this instance. */ Tcl_CancelIdleCall(DisposeInstance, (ClientData) instancePtr); if (instancePtr->colorTablePtr != NULL) { FreeColorTable(instancePtr->colorTablePtr); } GetColorTable(instancePtr); } instancePtr->refCount++; return (ClientData) instancePtr; } } /* * The image isn't already in use in a window with the same colormap. * Make a new instance of the image. */ instancePtr = (PhotoInstance *) ckalloc(sizeof(PhotoInstance)); instancePtr->masterPtr = masterPtr; instancePtr->display = Tk_Display(tkwin); instancePtr->colormap = Tk_Colormap(tkwin); Tk_PreserveColormap(instancePtr->display, instancePtr->colormap); instancePtr->refCount = 1; instancePtr->colorTablePtr = NULL; instancePtr->pixels = None; instancePtr->error = NULL; instancePtr->width = 0; instancePtr->height = 0; instancePtr->imagePtr = 0; instancePtr->nextPtr = masterPtr->instancePtr; masterPtr->instancePtr = instancePtr; /* * Obtain information about the visual and decide on the * default palette. */ visualInfo.screen = Tk_ScreenNumber(tkwin); visualInfo.visualid = XVisualIDFromVisual(Tk_Visual(tkwin)); visInfoPtr = XGetVisualInfo(Tk_Display(tkwin), VisualScreenMask | VisualIDMask, &visualInfo, &numVisuals); nRed = 2; nGreen = nBlue = 0; mono = 1; if (visInfoPtr != NULL) { instancePtr->visualInfo = *visInfoPtr; switch (visInfoPtr->class) { case DirectColor: case TrueColor: nRed = 1 << CountBits(visInfoPtr->red_mask); nGreen = 1 << CountBits(visInfoPtr->green_mask); nBlue = 1 << CountBits(visInfoPtr->blue_mask); mono = 0; break; case PseudoColor: case StaticColor: if (visInfoPtr->depth > 15) { nRed = 32; nGreen = 32; nBlue = 32; mono = 0; } else if (visInfoPtr->depth >= 3) { int *ip = paletteChoice[visInfoPtr->depth - 3]; nRed = ip[0]; nGreen = ip[1]; nBlue = ip[2]; mono = 0; } break; case GrayScale: case StaticGray: nRed = 1 << visInfoPtr->depth; break; } XFree((char *) visInfoPtr); } else { panic("ImgPhotoGet couldn't find visual for window"); } sprintf(buf, ((mono) ? "%d": "%d/%d/%d"), nRed, nGreen, nBlue); instancePtr->defaultPalette = Tk_GetUid(buf); /* * Make a GC with background = black and foreground = white. */ white = Tk_GetColor(masterPtr->interp, tkwin, "white"); black = Tk_GetColor(masterPtr->interp, tkwin, "black"); gcValues.foreground = (white != NULL)? white->pixel: WhitePixelOfScreen(Tk_Screen(tkwin)); gcValues.background = (black != NULL)? black->pixel: BlackPixelOfScreen(Tk_Screen(tkwin)); gcValues.graphics_exposures = False; instancePtr->gc = Tk_GetGC(tkwin, GCForeground|GCBackground|GCGraphicsExposures, &gcValues); /* * Set configuration options and finish the initialization of the instance. */ ImgPhotoConfigureInstance(instancePtr); /* * If this is the first instance, must set the size of the image. */ if (instancePtr->nextPtr == NULL) { Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0, masterPtr->width, masterPtr->height); } /* * Dither the image to fill in this instance's pixmap. */ TkClipBox(masterPtr->validRegion, &validBox); if ((validBox.width > 0) && (validBox.height > 0)) { DitherInstance(instancePtr, validBox.x, validBox.y, validBox.width, validBox.height); } return (ClientData) instancePtr; } /* *---------------------------------------------------------------------- * * ImgPhotoDisplay -- * * This procedure is invoked to draw a photo image. * * Results: * None. * * Side effects: * A portion of the image gets rendered in a pixmap or window. * *---------------------------------------------------------------------- */ static void ImgPhotoDisplay(clientData, display, drawable, imageX, imageY, width, height, drawableX, drawableY) ClientData clientData; /* Pointer to PhotoInstance structure for * for instance to be displayed. */ Display *display; /* Display on which to draw image. */ Drawable drawable; /* Pixmap or window in which to draw image. */ int imageX, imageY; /* Upper-left corner of region within image * to draw. */ int width, height; /* Dimensions of region within image to draw. */ int drawableX, drawableY; /* Coordinates within drawable that * correspond to imageX and imageY. */ { PhotoInstance *instancePtr = (PhotoInstance *) clientData; /* * If there's no pixmap, it means that an error occurred * while creating the image instance so it can't be displayed. */ if (instancePtr->pixels == None) { return; } /* * masterPtr->region describes which parts of the image contain * valid data. We set this region as the clip mask for the gc, * setting its origin appropriately, and use it when drawing the * image. */ TkSetRegion(display, instancePtr->gc, instancePtr->masterPtr->validRegion); XSetClipOrigin(display, instancePtr->gc, drawableX - imageX, drawableY - imageY); XCopyArea(display, instancePtr->pixels, drawable, instancePtr->gc, imageX, imageY, (unsigned) width, (unsigned) height, drawableX, drawableY); XSetClipMask(display, instancePtr->gc, None); XSetClipOrigin(display, instancePtr->gc, 0, 0); } /* *---------------------------------------------------------------------- * * ImgPhotoFree -- * * This procedure is called when a widget ceases to use a * particular instance of an image. We don't actually get * rid of the instance until later because we may be about * to get this instance again. * * Results: * None. * * Side effects: * Internal data structures get cleaned up, later. * *---------------------------------------------------------------------- */ static void ImgPhotoFree(clientData, display) ClientData clientData; /* Pointer to PhotoInstance structure for * for instance to be displayed. */ Display *display; /* Display containing window that used image. */ { PhotoInstance *instancePtr = (PhotoInstance *) clientData; ColorTable *colorPtr; instancePtr->refCount -= 1; if (instancePtr->refCount > 0) { return; } /* * There are no more uses of the image within this widget. * Decrement the count of live uses of its color table, so * that its colors can be reclaimed if necessary, and * set up an idle call to free the instance structure. */ colorPtr = instancePtr->colorTablePtr; if (colorPtr != NULL) { colorPtr->liveRefCount -= 1; } Tcl_DoWhenIdle(DisposeInstance, (ClientData) instancePtr); } /* *---------------------------------------------------------------------- * * ImgPhotoDelete -- * * This procedure is called by the image code to delete the * master structure for an image. * * Results: * None. * * Side effects: * Resources associated with the image get freed. * *---------------------------------------------------------------------- */ static void ImgPhotoDelete(masterData) ClientData masterData; /* Pointer to PhotoMaster structure for * image. Must not have any more instances. */ { PhotoMaster *masterPtr = (PhotoMaster *) masterData; PhotoInstance *instancePtr; while ((instancePtr = masterPtr->instancePtr) != NULL) { if (instancePtr->refCount > 0) { panic("tried to delete photo image when instances still exist"); } Tcl_CancelIdleCall(DisposeInstance, (ClientData) instancePtr); DisposeInstance((ClientData) instancePtr); } masterPtr->tkMaster = NULL; if (masterPtr->imageCmd != NULL) { Tcl_DeleteCommandFromToken(masterPtr->interp, masterPtr->imageCmd); } if (masterPtr->pix24 != NULL) { ckfree((char *) masterPtr->pix24); } if (masterPtr->validRegion != NULL) { TkDestroyRegion(masterPtr->validRegion); } Tk_FreeOptions(configSpecs, (char *) masterPtr, (Display *) NULL, 0); ckfree((char *) masterPtr); } /* *---------------------------------------------------------------------- * * ImgPhotoCmdDeletedProc -- * * This procedure is invoked when the image command for an image * is deleted. It deletes the image. * * Results: * None. * * Side effects: * The image is deleted. * *---------------------------------------------------------------------- */ static void ImgPhotoCmdDeletedProc(clientData) ClientData clientData; /* Pointer to PhotoMaster structure for * image. */ { PhotoMaster *masterPtr = (PhotoMaster *) clientData; masterPtr->imageCmd = NULL; if (masterPtr->tkMaster != NULL) { Tk_DeleteImage(masterPtr->interp, Tk_NameOfImage(masterPtr->tkMaster)); } } /* *---------------------------------------------------------------------- * * ImgPhotoSetSize -- * * This procedure reallocates the image storage and instance * pixmaps for a photo image, as necessary, to change the * image's size to `width' x `height' pixels. * * Results: * None. * * Side effects: * Storage gets reallocated, for the master and all its instances. * *---------------------------------------------------------------------- */ static void ImgPhotoSetSize(masterPtr, width, height) PhotoMaster *masterPtr; int width, height; { unsigned char *newPix24; int h, offset, pitch; unsigned char *srcPtr, *destPtr; XRectangle validBox, clipBox; TkRegion clipRegion; PhotoInstance *instancePtr; if (masterPtr->userWidth > 0) { width = masterPtr->userWidth; } if (masterPtr->userHeight > 0) { height = masterPtr->userHeight; } /* * We have to trim the valid region if it is currently * larger than the new image size. */ TkClipBox(masterPtr->validRegion, &validBox); if ((validBox.x + validBox.width > width) || (validBox.y + validBox.height > height)) { clipBox.x = 0; clipBox.y = 0; clipBox.width = width; clipBox.height = height; clipRegion = TkCreateRegion(); TkUnionRectWithRegion(&clipBox, clipRegion, clipRegion); TkIntersectRegion(masterPtr->validRegion, clipRegion, masterPtr->validRegion); TkDestroyRegion(clipRegion); TkClipBox(masterPtr->validRegion, &validBox); } if ((width != masterPtr->width) || (height != masterPtr->height) || (masterPtr->pix24 == NULL)) { /* * Reallocate storage for the 24-bit image and copy * over valid regions. */ pitch = width * 3; newPix24 = (unsigned char *) ckalloc((unsigned) (height * pitch)); /* * Zero the new array. The dithering code shouldn't read the * areas outside validBox, but they might be copied to another * photo image or written to a file. */ if ((masterPtr->pix24 != NULL) && ((width == masterPtr->width) || (width == validBox.width))) { if (validBox.y > 0) { memset((VOID *) newPix24, 0, (size_t) (validBox.y * pitch)); } h = validBox.y + validBox.height; if (h < height) { memset((VOID *) (newPix24 + h * pitch), 0, (size_t) ((height - h) * pitch)); } } else { memset((VOID *) newPix24, 0, (size_t) (height * pitch)); } if (masterPtr->pix24 != NULL) { /* * Copy the common area over to the new array array and * free the old array. */ if (width == masterPtr->width) { /* * The region to be copied is contiguous. */ offset = validBox.y * pitch; memcpy((VOID *) (newPix24 + offset), (VOID *) (masterPtr->pix24 + offset), (size_t) (validBox.height * pitch)); } else if ((validBox.width > 0) && (validBox.height > 0)) { /* * Area to be copied is not contiguous - copy line by line. */ destPtr = newPix24 + (validBox.y * width + validBox.x) * 3; srcPtr = masterPtr->pix24 + (validBox.y * masterPtr->width + validBox.x) * 3; for (h = validBox.height; h > 0; h--) { memcpy((VOID *) destPtr, (VOID *) srcPtr, (size_t) (validBox.width * 3)); destPtr += width * 3; srcPtr += masterPtr->width * 3; } } ckfree((char *) masterPtr->pix24); } masterPtr->pix24 = newPix24; masterPtr->width = width; masterPtr->height = height; /* * Dithering will be correct up to the end of the last * pre-existing complete scanline. */ if ((validBox.x > 0) || (validBox.y > 0)) { masterPtr->ditherX = 0; masterPtr->ditherY = 0; } else if (validBox.width == width) { if ((int) validBox.height < masterPtr->ditherY) { masterPtr->ditherX = 0; masterPtr->ditherY = validBox.height; } } else { if ((masterPtr->ditherY > 0) || ((int) validBox.width < masterPtr->ditherX)) { masterPtr->ditherX = validBox.width; masterPtr->ditherY = 0; } } } /* * Now adjust the sizes of the pixmaps for all of the instances. */ for (instancePtr = masterPtr->instancePtr; instancePtr != NULL; instancePtr = instancePtr->nextPtr) { ImgPhotoInstanceSetSize(instancePtr); } } /* *---------------------------------------------------------------------- * * ImgPhotoInstanceSetSize -- * * This procedure reallocates the instance pixmap and dithering * error array for a photo instance, as necessary, to change the * image's size to `width' x `height' pixels. * * Results: * None. * * Side effects: * Storage gets reallocated, here and in the X server. * *---------------------------------------------------------------------- */ static void ImgPhotoInstanceSetSize(instancePtr) PhotoInstance *instancePtr; /* Instance whose size is to be * changed. */ { PhotoMaster *masterPtr; schar *newError; schar *errSrcPtr, *errDestPtr; int h, offset; XRectangle validBox; Pixmap newPixmap; masterPtr = instancePtr->masterPtr; TkClipBox(masterPtr->validRegion, &validBox); if ((instancePtr->width != masterPtr->width) || (instancePtr->height != masterPtr->height) || (instancePtr->pixels == None)) { newPixmap = Tk_GetPixmap(instancePtr->display, RootWindow(instancePtr->display, instancePtr->visualInfo.screen), (masterPtr->width > 0) ? masterPtr->width: 1, (masterPtr->height > 0) ? masterPtr->height: 1, instancePtr->visualInfo.depth); /* * The following is a gross hack needed to properly support colormaps * under Windows. Before the pixels can be copied to the pixmap, * the relevent colormap must be associated with the drawable. * Normally we can infer this association from the window that * was used to create the pixmap. However, in this case we're * using the root window, so we have to be more explicit. */ TkSetPixmapColormap(newPixmap, instancePtr->colormap); if (instancePtr->pixels != None) { /* * Copy any common pixels from the old pixmap and free it. */ XCopyArea(instancePtr->display, instancePtr->pixels, newPixmap, instancePtr->gc, validBox.x, validBox.y, validBox.width, validBox.height, validBox.x, validBox.y); Tk_FreePixmap(instancePtr->display, instancePtr->pixels); } instancePtr->pixels = newPixmap; } if ((instancePtr->width != masterPtr->width) || (instancePtr->height != masterPtr->height) || (instancePtr->error == NULL)) { newError = (schar *) ckalloc((unsigned) (masterPtr->height * masterPtr->width * 3 * sizeof(schar))); /* * Zero the new array so that we don't get bogus error values * propagating into areas we dither later. */ if ((instancePtr->error != NULL) && ((instancePtr->width == masterPtr->width) || (validBox.width == masterPtr->width))) { if (validBox.y > 0) { memset((VOID *) newError, 0, (size_t) (validBox.y * masterPtr->width * 3 * sizeof(schar))); } h = validBox.y + validBox.height; if (h < masterPtr->height) { memset((VOID *) (newError + h * masterPtr->width * 3), 0, (size_t) ((masterPtr->height - h) * masterPtr->width * 3 * sizeof(schar))); } } else { memset((VOID *) newError, 0, (size_t) (masterPtr->height * masterPtr->width * 3 * sizeof(schar))); } if (instancePtr->error != NULL) { /* * Copy the common area over to the new array * and free the old array. */ if (masterPtr->width == instancePtr->width) { offset = validBox.y * masterPtr->width * 3; memcpy((VOID *) (newError + offset), (VOID *) (instancePtr->error + offset), (size_t) (validBox.height * masterPtr->width * 3 * sizeof(schar))); } else if (validBox.width > 0 && validBox.height > 0) { errDestPtr = newError + (validBox.y * masterPtr->width + validBox.x) * 3; errSrcPtr = instancePtr->error + (validBox.y * instancePtr->width + validBox.x) * 3; for (h = validBox.height; h > 0; --h) { memcpy((VOID *) errDestPtr, (VOID *) errSrcPtr, validBox.width * 3 * sizeof(schar)); errDestPtr += masterPtr->width * 3; errSrcPtr += instancePtr->width * 3; } } ckfree((char *) instancePtr->error); } instancePtr->error = newError; } instancePtr->width = masterPtr->width; instancePtr->height = masterPtr->height; } /* *---------------------------------------------------------------------- * * IsValidPalette -- * * This procedure is called to check whether a value given for * the -palette option is valid for a particular instance * of a photo image. * * Results: * A boolean value: 1 if the palette is acceptable, 0 otherwise. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int IsValidPalette(instancePtr, palette) PhotoInstance *instancePtr; /* Instance to which the palette * specification is to be applied. */ char *palette; /* Palette specification string. */ { int nRed, nGreen, nBlue, mono, numColors; char *endp; /* * First parse the specification: it must be of the form * %d or %d/%d/%d. */ nRed = strtol(palette, &endp, 10); if ((endp == palette) || ((*endp != 0) && (*endp != '/')) || (nRed < 2) || (nRed > 256)) { return 0; } if (*endp == 0) { mono = 1; nGreen = nBlue = nRed; } else { palette = endp + 1; nGreen = strtol(palette, &endp, 10); if ((endp == palette) || (*endp != '/') || (nGreen < 2) || (nGreen > 256)) { return 0; } palette = endp + 1; nBlue = strtol(palette, &endp, 10); if ((endp == palette) || (*endp != 0) || (nBlue < 2) || (nBlue > 256)) { return 0; } mono = 0; } switch (instancePtr->visualInfo.class) { case DirectColor: case TrueColor: if ((nRed > (1 << CountBits(instancePtr->visualInfo.red_mask))) || (nGreen > (1 << CountBits(instancePtr->visualInfo.green_mask))) || (nBlue > (1 << CountBits(instancePtr->visualInfo.blue_mask)))) { return 0; } break; case PseudoColor: case StaticColor: numColors = nRed; if (!mono) { numColors *= nGreen*nBlue; } if (numColors > (1 << instancePtr->visualInfo.depth)) { return 0; } break; case GrayScale: case StaticGray: if (!mono || (nRed > (1 << instancePtr->visualInfo.depth))) { return 0; } break; } return 1; } /* *---------------------------------------------------------------------- * * CountBits -- * * This procedure counts how many bits are set to 1 in `mask'. * * Results: * The integer number of bits. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int CountBits(mask) pixel mask; /* Value to count the 1 bits in. */ { int n; for( n = 0; mask != 0; mask &= mask - 1 ) n++; return n; } /* *---------------------------------------------------------------------- * * GetColorTable -- * * This procedure is called to allocate a table of colormap * information for an instance of a photo image. Only one such * table is allocated for all photo instances using the same * display, colormap, palette and gamma values, so that the * application need only request a set of colors from the X * server once for all such photo widgets. This procedure * maintains a hash table to find previously-allocated * ColorTables. * * Results: * None. * * Side effects: * A new ColorTable may be allocated and placed in the hash * table, and have colors allocated for it. * *---------------------------------------------------------------------- */ static void GetColorTable(instancePtr) PhotoInstance *instancePtr; /* Instance needing a color table. */ { ColorTable *colorPtr; Tcl_HashEntry *entry; ColorTableId id; int isNew; /* * Look for an existing ColorTable in the hash table. */ memset((VOID *) &id, 0, sizeof(id)); id.display = instancePtr->display; id.colormap = instancePtr->colormap; id.palette = instancePtr->palette; id.gamma = instancePtr->gamma; if (!imgPhotoColorHashInitialized) { Tcl_InitHashTable(&imgPhotoColorHash, N_COLOR_HASH); imgPhotoColorHashInitialized = 1; } entry = Tcl_CreateHashEntry(&imgPhotoColorHash, (char *) &id, &isNew); if (!isNew) { /* * Re-use the existing entry. */ colorPtr = (ColorTable *) Tcl_GetHashValue(entry); } else { /* * No color table currently available; need to make one. */ colorPtr = (ColorTable *) ckalloc(sizeof(ColorTable)); /* * The following line of code should not normally be needed due * to the assignment in the following line. However, it compensates * for bugs in some compilers (HP, for example) where * sizeof(ColorTable) is 24 but the assignment only copies 20 bytes, * leaving 4 bytes uninitialized; these cause problems when using * the id for lookups in imgPhotoColorHash, and can result in * core dumps. */ memset((VOID *) &colorPtr->id, 0, sizeof(ColorTableId)); colorPtr->id = id; Tk_PreserveColormap(colorPtr->id.display, colorPtr->id.colormap); colorPtr->flags = 0; colorPtr->refCount = 0; colorPtr->liveRefCount = 0; colorPtr->numColors = 0; colorPtr->visualInfo = instancePtr->visualInfo; colorPtr->pixelMap = NULL; Tcl_SetHashValue(entry, colorPtr); } colorPtr->refCount++; colorPtr->liveRefCount++; instancePtr->colorTablePtr = colorPtr; if (colorPtr->flags & DISPOSE_PENDING) { Tcl_CancelIdleCall(DisposeColorTable, (ClientData) colorPtr); colorPtr->flags &= ~DISPOSE_PENDING; } /* * Allocate colors for this color table if necessary. */ if ((colorPtr->numColors == 0) && ((colorPtr->flags & BLACK_AND_WHITE) == 0)) { AllocateColors(colorPtr); } } /* *---------------------------------------------------------------------- * * FreeColorTable -- * * This procedure is called when an instance ceases using a * color table. * * Results: * None. * * Side effects: * If no other instances are using this color table, a when-idle * handler is registered to free up the color table and the colors * allocated for it. * *---------------------------------------------------------------------- */ static void FreeColorTable(colorPtr) ColorTable *colorPtr; /* Pointer to the color table which is * no longer required by an instance. */ { colorPtr->refCount--; if (colorPtr->refCount > 0) { return; } if ((colorPtr->flags & DISPOSE_PENDING) == 0) { Tcl_DoWhenIdle(DisposeColorTable, (ClientData) colorPtr); colorPtr->flags |= DISPOSE_PENDING; } } /* *---------------------------------------------------------------------- * * AllocateColors -- * * This procedure allocates the colors required by a color table, * and sets up the fields in the color table data structure which * are used in dithering. * * Results: * None. * * Side effects: * Colors are allocated from the X server. Fields in the * color table data structure are updated. * *---------------------------------------------------------------------- */ static void AllocateColors(colorPtr) ColorTable *colorPtr; /* Pointer to the color table requiring * colors to be allocated. */ { int i, r, g, b, rMult, mono; int numColors, nRed, nGreen, nBlue; double fr, fg, fb, igam; XColor *colors; unsigned long *pixels; /* 16-bit intensity value for i/n of full intensity. */ # define CFRAC(i, n) ((i) * 65535 / (n)) /* As for CFRAC, but apply exponent of g. */ # define CGFRAC(i, n, g) ((int)(65535 * pow((double)(i) / (n), (g)))) /* * First parse the palette specification to get the required number of * shades of each primary. */ mono = sscanf(colorPtr->id.palette, "%d/%d/%d", &nRed, &nGreen, &nBlue) <= 1; igam = 1.0 / colorPtr->id.gamma; /* * Each time around this loop, we reduce the number of colors we're * trying to allocate until we succeed in allocating all of the colors * we need. */ for (;;) { /* * If we are using 1 bit/pixel, we don't need to allocate * any colors (we just use the foreground and background * colors in the GC). */ if (mono && (nRed <= 2)) { colorPtr->flags |= BLACK_AND_WHITE; return; } /* * Calculate the RGB coordinates of the colors we want to * allocate and store them in *colors. */ if ((colorPtr->visualInfo.class == DirectColor) || (colorPtr->visualInfo.class == TrueColor)) { /* * Direct/True Color: allocate shades of red, green, blue * independently. */ if (mono) { numColors = nGreen = nBlue = nRed; } else { numColors = MAX(MAX(nRed, nGreen), nBlue); } colors = (XColor *) ckalloc(numColors * sizeof(XColor)); for (i = 0; i < numColors; ++i) { if (igam == 1.0) { colors[i].red = CFRAC(i, nRed - 1); colors[i].green = CFRAC(i, nGreen - 1); colors[i].blue = CFRAC(i, nBlue - 1); } else { colors[i].red = CGFRAC(i, nRed - 1, igam); colors[i].green = CGFRAC(i, nGreen - 1, igam); colors[i].blue = CGFRAC(i, nBlue - 1, igam); } } } else { /* * PseudoColor, StaticColor, GrayScale or StaticGray visual: * we have to allocate each color in the color cube separately. */ numColors = (mono) ? nRed: (nRed * nGreen * nBlue); colors = (XColor *) ckalloc(numColors * sizeof(XColor)); if (!mono) { /* * Color display using a PseudoColor or StaticColor visual. */ i = 0; for (r = 0; r < nRed; ++r) { for (g = 0; g < nGreen; ++g) { for (b = 0; b < nBlue; ++b) { if (igam == 1.0) { colors[i].red = CFRAC(r, nRed - 1); colors[i].green = CFRAC(g, nGreen - 1); colors[i].blue = CFRAC(b, nBlue - 1); } else { colors[i].red = CGFRAC(r, nRed - 1, igam); colors[i].green = CGFRAC(g, nGreen - 1, igam); colors[i].blue = CGFRAC(b, nBlue - 1, igam); } i++; } } } } else { /* * Monochrome display - allocate the shades of grey we want. */ for (i = 0; i < numColors; ++i) { if (igam == 1.0) { r = CFRAC(i, numColors - 1); } else { r = CGFRAC(i, numColors - 1, igam); } colors[i].red = colors[i].green = colors[i].blue = r; } } } /* * Now try to allocate the colors we've calculated. */ pixels = (unsigned long *) ckalloc(numColors * sizeof(unsigned long)); for (i = 0; i < numColors; ++i) { if (!XAllocColor(colorPtr->id.display, colorPtr->id.colormap, &colors[i])) { /* * Can't get all the colors we want in the default colormap; * first try freeing colors from other unused color tables. */ if (!ReclaimColors(&colorPtr->id, numColors - i) || !XAllocColor(colorPtr->id.display, colorPtr->id.colormap, &colors[i])) { /* * Still can't allocate the color. */ break; } } pixels[i] = colors[i].pixel; } /* * If we didn't get all of the colors, reduce the * resolution of the color cube, free the ones we got, * and try again. */ if (i >= numColors) { break; } XFreeColors(colorPtr->id.display, colorPtr->id.colormap, pixels, i, 0); ckfree((char *) colors); ckfree((char *) pixels); if (!mono) { if ((nRed == 2) && (nGreen == 2) && (nBlue == 2)) { /* * Fall back to 1-bit monochrome display. */ mono = 1; } else { /* * Reduce the number of shades of each primary to about * 3/4 of the previous value. This should reduce the * total number of colors required to about half the * previous value for PseudoColor displays. */ nRed = (nRed * 3 + 2) / 4; nGreen = (nGreen * 3 + 2) / 4; nBlue = (nBlue * 3 + 2) / 4; } } else { /* * Reduce the number of shades of gray to about 1/2. */ nRed = nRed / 2; } } /* * We have allocated all of the necessary colors: * fill in various fields of the ColorTable record. */ if (!mono) { colorPtr->flags |= COLOR_WINDOW; /* * The following is a hairy hack. We only want to index into * the pixelMap on colormap displays. However, if the display * is on Windows, then we actually want to store the index not * the value since we will be passing the color table into the * TkPutImage call. */ #ifndef __WIN32__ if ((colorPtr->visualInfo.class != DirectColor) && (colorPtr->visualInfo.class != TrueColor)) { colorPtr->flags |= MAP_COLORS; } #endif /* __WIN32__ */ } colorPtr->numColors = numColors; colorPtr->pixelMap = pixels; /* * Set up quantization tables for dithering. */ rMult = nGreen * nBlue; for (i = 0; i < 256; ++i) { r = (i * (nRed - 1) + 127) / 255; if (mono) { fr = (double) colors[r].red / 65535.0; if (colorPtr->id.gamma != 1.0 ) { fr = pow(fr, colorPtr->id.gamma); } colorPtr->colorQuant[0][i] = (int)(fr * 255.99); colorPtr->redValues[i] = colors[r].pixel; } else { g = (i * (nGreen - 1) + 127) / 255; b = (i * (nBlue - 1) + 127) / 255; if ((colorPtr->visualInfo.class == DirectColor) || (colorPtr->visualInfo.class == TrueColor)) { colorPtr->redValues[i] = colors[r].pixel & colorPtr->visualInfo.red_mask; colorPtr->greenValues[i] = colors[g].pixel & colorPtr->visualInfo.green_mask; colorPtr->blueValues[i] = colors[b].pixel & colorPtr->visualInfo.blue_mask; } else { r *= rMult; g *= nBlue; colorPtr->redValues[i] = r; colorPtr->greenValues[i] = g; colorPtr->blueValues[i] = b; } fr = (double) colors[r].red / 65535.0; fg = (double) colors[g].green / 65535.0; fb = (double) colors[b].blue / 65535.0; if (colorPtr->id.gamma != 1.0) { fr = pow(fr, colorPtr->id.gamma); fg = pow(fg, colorPtr->id.gamma); fb = pow(fb, colorPtr->id.gamma); } colorPtr->colorQuant[0][i] = (int)(fr * 255.99); colorPtr->colorQuant[1][i] = (int)(fg * 255.99); colorPtr->colorQuant[2][i] = (int)(fb * 255.99); } } ckfree((char *) colors); } /* *---------------------------------------------------------------------- * * DisposeColorTable -- * * * Results: * None. * * Side effects: * The colors in the argument color table are freed, as is the * color table structure itself. The color table is removed * from the hash table which is used to locate color tables. * *---------------------------------------------------------------------- */ static void DisposeColorTable(clientData) ClientData clientData; /* Pointer to the ColorTable whose * colors are to be released. */ { ColorTable *colorPtr; Tcl_HashEntry *entry; colorPtr = (ColorTable *) clientData; if (colorPtr->pixelMap != NULL) { if (colorPtr->numColors > 0) { XFreeColors(colorPtr->id.display, colorPtr->id.colormap, colorPtr->pixelMap, colorPtr->numColors, 0); Tk_FreeColormap(colorPtr->id.display, colorPtr->id.colormap); } ckfree((char *) colorPtr->pixelMap); } entry = Tcl_FindHashEntry(&imgPhotoColorHash, (char *) &colorPtr->id); if (entry == NULL) { panic("DisposeColorTable couldn't find hash entry"); } Tcl_DeleteHashEntry(entry); ckfree((char *) colorPtr); } /* *---------------------------------------------------------------------- * * ReclaimColors -- * * This procedure is called to try to free up colors in the * colormap used by a color table. It looks for other color * tables with the same colormap and with a zero live reference * count, and frees their colors. It only does so if there is * the possibility of freeing up at least `numColors' colors. * * Results: * The return value is TRUE if any colors were freed, FALSE * otherwise. * * Side effects: * ColorTables which are not currently in use may lose their * color allocations. * *---------------------------------------------------------------------- */ static int ReclaimColors(id, numColors) ColorTableId *id; /* Pointer to information identifying * the color table which needs more colors. */ int numColors; /* Number of colors required. */ { Tcl_HashSearch srch; Tcl_HashEntry *entry; ColorTable *colorPtr; int nAvail; /* * First scan through the color hash table to get an * upper bound on how many colors we might be able to free. */ nAvail = 0; entry = Tcl_FirstHashEntry(&imgPhotoColorHash, &srch); while (entry != NULL) { colorPtr = (ColorTable *) Tcl_GetHashValue(entry); if ((colorPtr->id.display == id->display) && (colorPtr->id.colormap == id->colormap) && (colorPtr->liveRefCount == 0 )&& (colorPtr->numColors != 0) && ((colorPtr->id.palette != id->palette) || (colorPtr->id.gamma != id->gamma))) { /* * We could take this guy's colors off him. */ nAvail += colorPtr->numColors; } entry = Tcl_NextHashEntry(&srch); } /* * nAvail is an (over)estimate of the number of colors we could free. */ if (nAvail < numColors) { return 0; } /* * Scan through a second time freeing colors. */ entry = Tcl_FirstHashEntry(&imgPhotoColorHash, &srch); while ((entry != NULL) && (numColors > 0)) { colorPtr = (ColorTable *) Tcl_GetHashValue(entry); if ((colorPtr->id.display == id->display) && (colorPtr->id.colormap == id->colormap) && (colorPtr->liveRefCount == 0) && (colorPtr->numColors != 0) && ((colorPtr->id.palette != id->palette) || (colorPtr->id.gamma != id->gamma))) { /* * Free the colors that this ColorTable has. */ XFreeColors(colorPtr->id.display, colorPtr->id.colormap, colorPtr->pixelMap, colorPtr->numColors, 0); numColors -= colorPtr->numColors; colorPtr->numColors = 0; ckfree((char *) colorPtr->pixelMap); colorPtr->pixelMap = NULL; } entry = Tcl_NextHashEntry(&srch); } return 1; /* we freed some colors */ } /* *---------------------------------------------------------------------- * * DisposeInstance -- * * This procedure is called to finally free up an instance * of a photo image which is no longer required. * * Results: * None. * * Side effects: * The instance data structure and the resources it references * are freed. * *---------------------------------------------------------------------- */ static void DisposeInstance(clientData) ClientData clientData; /* Pointer to the instance whose resources * are to be released. */ { PhotoInstance *instancePtr = (PhotoInstance *) clientData; PhotoInstance *prevPtr; if (instancePtr->pixels != None) { Tk_FreePixmap(instancePtr->display, instancePtr->pixels); } if (instancePtr->gc != None) { Tk_FreeGC(instancePtr->display, instancePtr->gc); } if (instancePtr->imagePtr != NULL) { XFree((char *) instancePtr->imagePtr); } if (instancePtr->error != NULL) { ckfree((char *) instancePtr->error); } if (instancePtr->colorTablePtr != NULL) { FreeColorTable(instancePtr->colorTablePtr); } if (instancePtr->masterPtr->instancePtr == instancePtr) { instancePtr->masterPtr->instancePtr = instancePtr->nextPtr; } else { for (prevPtr = instancePtr->masterPtr->instancePtr; prevPtr->nextPtr != instancePtr; prevPtr = prevPtr->nextPtr) { /* Empty loop body */ } prevPtr->nextPtr = instancePtr->nextPtr; } Tk_FreeColormap(instancePtr->display, instancePtr->colormap); ckfree((char *) instancePtr); } /* *---------------------------------------------------------------------- * * MatchFileFormat -- * * This procedure is called to find a photo image file format * handler which can parse the image data in the given file. * If a user-specified format string is provided, only handlers * whose names match a prefix of the format string are tried. * * Results: * A standard TCL return value. If the return value is TCL_OK, a * pointer to the image format record is returned in * *imageFormatPtr, and the width and height of the image are * returned in *widthPtr and *heightPtr. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int MatchFileFormat(interp, chan, fileName, formatString, imageFormatPtr, widthPtr, heightPtr) Tcl_Interp *interp; /* Interpreter to use for reporting errors. */ Tcl_Channel chan; /* The image file, open for reading. */ char *fileName; /* The name of the image file. */ char *formatString; /* User-specified format string, or NULL. */ Tk_PhotoImageFormat **imageFormatPtr; /* A pointer to the photo image format * record is returned here. */ int *widthPtr, *heightPtr; /* The dimensions of the image are * returned here. */ { int matched; Tk_PhotoImageFormat *formatPtr; /* * Scan through the table of file format handlers to find * one which can handle the image. */ matched = 0; for (formatPtr = formatList; formatPtr != NULL; formatPtr = formatPtr->nextPtr) { if (formatString != NULL) { if (strncasecmp(formatString, formatPtr->name, strlen(formatPtr->name)) != 0) { continue; } matched = 1; if (formatPtr->fileMatchProc == NULL) { Tcl_AppendResult(interp, "-file option isn't supported for ", formatString, " images", (char *) NULL); return TCL_ERROR; } } if (formatPtr->fileMatchProc != NULL) { (void) Tcl_Seek(chan, 0L, SEEK_SET); if ((*formatPtr->fileMatchProc)(chan, fileName, formatString, widthPtr, heightPtr)) { if (*widthPtr < 1) { *widthPtr = 1; } if (*heightPtr < 1) { *heightPtr = 1; } break; } } } if (formatPtr == NULL) { if ((formatString != NULL) && !matched) { Tcl_AppendResult(interp, "image file format \"", formatString, "\" is not supported", (char *) NULL); } else { Tcl_AppendResult(interp, "couldn't recognize data in image file \"", fileName, "\"", (char *) NULL); } return TCL_ERROR; } *imageFormatPtr = formatPtr; (void) Tcl_Seek(chan, 0L, SEEK_SET); return TCL_OK; } /* *---------------------------------------------------------------------- * * MatchStringFormat -- * * This procedure is called to find a photo image file format * handler which can parse the image data in the given string. * If a user-specified format string is provided, only handlers * whose names match a prefix of the format string are tried. * * Results: * A standard TCL return value. If the return value is TCL_OK, a * pointer to the image format record is returned in * *imageFormatPtr, and the width and height of the image are * returned in *widthPtr and *heightPtr. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int MatchStringFormat(interp, string, formatString, imageFormatPtr, widthPtr, heightPtr) Tcl_Interp *interp; /* Interpreter to use for reporting errors. */ char *string; /* String containing the image data. */ char *formatString; /* User-specified format string, or NULL. */ Tk_PhotoImageFormat **imageFormatPtr; /* A pointer to the photo image format * record is returned here. */ int *widthPtr, *heightPtr; /* The dimensions of the image are * returned here. */ { int matched; Tk_PhotoImageFormat *formatPtr; /* * Scan through the table of file format handlers to find * one which can handle the image. */ matched = 0; for (formatPtr = formatList; formatPtr != NULL; formatPtr = formatPtr->nextPtr) { if (formatString != NULL) { if (strncasecmp(formatString, formatPtr->name, strlen(formatPtr->name)) != 0) { continue; } matched = 1; if (formatPtr->stringMatchProc == NULL) { Tcl_AppendResult(interp, "-data option isn't supported for ", formatString, " images", (char *) NULL); return TCL_ERROR; } } if ((formatPtr->stringMatchProc != NULL) && (*formatPtr->stringMatchProc)(string, formatString, widthPtr, heightPtr)) { break; } } if (formatPtr == NULL) { if ((formatString != NULL) && !matched) { Tcl_AppendResult(interp, "image format \"", formatString, "\" is not supported", (char *) NULL); } else { Tcl_AppendResult(interp, "couldn't recognize image data", (char *) NULL); } return TCL_ERROR; } *imageFormatPtr = formatPtr; return TCL_OK; } /* *---------------------------------------------------------------------- * * Tk_FindPhoto -- * * This procedure is called to get an opaque handle (actually a * PhotoMaster *) for a given image, which can be used in * subsequent calls to Tk_PhotoPutBlock, etc. The `name' * parameter is the name of the image. * * Results: * The handle for the photo image, or NULL if there is no * photo image with the name given. * * Side effects: * None. * *---------------------------------------------------------------------- */ Tk_PhotoHandle Tk_FindPhoto(interp, imageName) Tcl_Interp *interp; /* Interpreter (application) in which image * exists. */ char *imageName; /* Name of the desired photo image. */ { ClientData clientData; Tk_ImageType *typePtr; clientData = Tk_GetImageMasterData(interp, imageName, &typePtr); if (typePtr != &tkPhotoImageType) { return NULL; } return (Tk_PhotoHandle) clientData; } /* *---------------------------------------------------------------------- * * Tk_PhotoPutBlock -- * * This procedure is called to put image data into a photo image. * * Results: * None. * * Side effects: * The image data is stored. The image may be expanded. * The Tk image code is informed that the image has changed. * *---------------------------------------------------------------------- */ void Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height) Tk_PhotoHandle handle; /* Opaque handle for the photo image * to be updated. */ register Tk_PhotoImageBlock *blockPtr; /* Pointer to a structure describing the * pixel data to be copied into the image. */ int x, y; /* Coordinates of the top-left pixel to * be updated in the image. */ int width, height; /* Dimensions of the area of the image * to be updated. */ { register PhotoMaster *masterPtr; int xEnd, yEnd; int greenOffset, blueOffset; int wLeft, hLeft; int wCopy, hCopy; unsigned char *srcPtr, *srcLinePtr; unsigned char *destPtr, *destLinePtr; int pitch; XRectangle rect; masterPtr = (PhotoMaster *) handle; if ((masterPtr->userWidth != 0) && ((x + width) > masterPtr->userWidth)) { width = masterPtr->userWidth - x; } if ((masterPtr->userHeight != 0) && ((y + height) > masterPtr->userHeight)) { height = masterPtr->userHeight - y; } if ((width <= 0) || (height <= 0)) return; xEnd = x + width; yEnd = y + height; if ((xEnd > masterPtr->width) || (yEnd > masterPtr->height)) { ImgPhotoSetSize(masterPtr, MAX(xEnd, masterPtr->width), MAX(yEnd, masterPtr->height)); } if ((y < masterPtr->ditherY) || ((y == masterPtr->ditherY) && (x < masterPtr->ditherX))) { /* * The dithering isn't correct past the start of this block. */ masterPtr->ditherX = x; masterPtr->ditherY = y; } /* * If this image block could have different red, green and blue * components, mark it as a color image. */ greenOffset = blockPtr->offset[1] - blockPtr->offset[0]; blueOffset = blockPtr->offset[2] - blockPtr->offset[0]; if ((greenOffset != 0) || (blueOffset != 0)) { masterPtr->flags |= COLOR_IMAGE; } /* * Copy the data into our local 24-bit/pixel array. * If we can do it with a single memcpy, we do. */ destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 3; pitch = masterPtr->width * 3; if ((blockPtr->pixelSize == 3) && (greenOffset == 1) && (blueOffset == 2) && (width <= blockPtr->width) && (height <= blockPtr->height) && ((height == 1) || ((x == 0) && (width == masterPtr->width) && (blockPtr->pitch == pitch)))) { memcpy((VOID *) destLinePtr, (VOID *) (blockPtr->pixelPtr + blockPtr->offset[0]), (size_t) (height * width * 3)); } else { for (hLeft = height; hLeft > 0;) { srcLinePtr = blockPtr->pixelPtr + blockPtr->offset[0]; hCopy = MIN(hLeft, blockPtr->height); hLeft -= hCopy; for (; hCopy > 0; --hCopy) { destPtr = destLinePtr; for (wLeft = width; wLeft > 0;) { wCopy = MIN(wLeft, blockPtr->width); wLeft -= wCopy; srcPtr = srcLinePtr; for (; wCopy > 0; --wCopy) { *destPtr++ = srcPtr[0]; *destPtr++ = srcPtr[greenOffset]; *destPtr++ = srcPtr[blueOffset]; srcPtr += blockPtr->pixelSize; } } srcLinePtr += blockPtr->pitch; destLinePtr += pitch; } } } /* * Add this new block to the region which specifies which data is valid. */ rect.x = x; rect.y = y; rect.width = width; rect.height = height; TkUnionRectWithRegion(&rect, masterPtr->validRegion, masterPtr->validRegion); /* * Update each instance. */ Dither(masterPtr, x, y, width, height); /* * Tell the core image code that this image has changed. */ Tk_ImageChanged(masterPtr->tkMaster, x, y, width, height, masterPtr->width, masterPtr->height); } /* *---------------------------------------------------------------------- * * Tk_PhotoPutZoomedBlock -- * * This procedure is called to put image data into a photo image, * with possible subsampling and/or zooming of the pixels. * * Results: * None. * * Side effects: * The image data is stored. The image may be expanded. * The Tk image code is informed that the image has changed. * *---------------------------------------------------------------------- */ void Tk_PhotoPutZoomedBlock(handle, blockPtr, x, y, width, height, zoomX, zoomY, subsampleX, subsampleY) Tk_PhotoHandle handle; /* Opaque handle for the photo image * to be updated. */ register Tk_PhotoImageBlock *blockPtr; /* Pointer to a structure describing the * pixel data to be copied into the image. */ int x, y; /* Coordinates of the top-left pixel to * be updated in the image. */ int width, height; /* Dimensions of the area of the image * to be updated. */ int zoomX, zoomY; /* Zoom factors for the X and Y axes. */ int subsampleX, subsampleY; /* Subsampling factors for the X and Y axes. */ { register PhotoMaster *masterPtr; int xEnd, yEnd; int greenOffset, blueOffset; int wLeft, hLeft; int wCopy, hCopy; int blockWid, blockHt; unsigned char *srcPtr, *srcLinePtr, *srcOrigPtr; unsigned char *destPtr, *destLinePtr; int pitch; int xRepeat, yRepeat; int blockXSkip, blockYSkip; XRectangle rect; if ((zoomX == 1) && (zoomY == 1) && (subsampleX == 1) && (subsampleY == 1)) { Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height); return; } masterPtr = (PhotoMaster *) handle; if ((zoomX <= 0) || (zoomY <= 0)) return; if ((masterPtr->userWidth != 0) && ((x + width) > masterPtr->userWidth)) { width = masterPtr->userWidth - x; } if ((masterPtr->userHeight != 0) && ((y + height) > masterPtr->userHeight)) { height = masterPtr->userHeight - y; } if ((width <= 0) || (height <= 0)) return; xEnd = x + width; yEnd = y + height; if ((xEnd > masterPtr->width) || (yEnd > masterPtr->height)) { int sameSrc = (blockPtr->pixelPtr == masterPtr->pix24); ImgPhotoSetSize(masterPtr, MAX(xEnd, masterPtr->width), MAX(yEnd, masterPtr->height)); if (sameSrc) { blockPtr->pixelPtr = masterPtr->pix24; } } if ((y < masterPtr->ditherY) || ((y == masterPtr->ditherY) && (x < masterPtr->ditherX))) { /* * The dithering isn't correct past the start of this block. */ masterPtr->ditherX = x; masterPtr->ditherY = y; } /* * If this image block could have different red, green and blue * components, mark it as a color image. */ greenOffset = blockPtr->offset[1] - blockPtr->offset[0]; blueOffset = blockPtr->offset[2] - blockPtr->offset[0]; if ((greenOffset != 0) || (blueOffset != 0)) { masterPtr->flags |= COLOR_IMAGE; } /* * Work out what area the pixel data in the block expands to after * subsampling and zooming. */ blockXSkip = subsampleX * blockPtr->pixelSize; blockYSkip = subsampleY * blockPtr->pitch; if (subsampleX > 0) blockWid = ((blockPtr->width + subsampleX - 1) / subsampleX) * zoomX; else if (subsampleX == 0) blockWid = width; else blockWid = ((blockPtr->width - subsampleX - 1) / -subsampleX) * zoomX; if (subsampleY > 0) blockHt = ((blockPtr->height + subsampleY - 1) / subsampleY) * zoomY; else if (subsampleY == 0) blockHt = height; else blockHt = ((blockPtr->height - subsampleY - 1) / -subsampleY) * zoomY; /* * Copy the data into our local 24-bit/pixel array. */ destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 3; srcOrigPtr = blockPtr->pixelPtr + blockPtr->offset[0]; if (subsampleX < 0) { srcOrigPtr += (blockPtr->width - 1) * blockPtr->pixelSize; } if (subsampleY < 0) { srcOrigPtr += (blockPtr->height - 1) * blockPtr->pitch; } pitch = masterPtr->width * 3; for (hLeft = height; hLeft > 0; ) { hCopy = MIN(hLeft, blockHt); hLeft -= hCopy; yRepeat = zoomY; srcLinePtr = srcOrigPtr; for (; hCopy > 0; --hCopy) { destPtr = destLinePtr; for (wLeft = width; wLeft > 0;) { wCopy = MIN(wLeft, blockWid); wLeft -= wCopy; srcPtr = srcLinePtr; for (; wCopy > 0; wCopy -= zoomX) { for (xRepeat = MIN(wCopy, zoomX); xRepeat > 0; xRepeat--) { *destPtr++ = srcPtr[0]; *destPtr++ = srcPtr[greenOffset]; *destPtr++ = srcPtr[blueOffset]; } srcPtr += blockXSkip; } } destLinePtr += pitch; yRepeat--; if (yRepeat <= 0) { srcLinePtr += blockYSkip; yRepeat = zoomY; } } } /* * Add this new block to the region that specifies which data is valid. */ rect.x = x; rect.y = y; rect.width = width; rect.height = height; TkUnionRectWithRegion(&rect, masterPtr->validRegion, masterPtr->validRegion); /* * Update each instance. */ Dither(masterPtr, x, y, width, height); /* * Tell the core image code that this image has changed. */ Tk_ImageChanged(masterPtr->tkMaster, x, y, width, height, masterPtr->width, masterPtr->height); } /* *---------------------------------------------------------------------- * * Dither -- * * This procedure is called to update an area of each instance's * pixmap by dithering the corresponding area of the image master. * * Results: * None. * * Side effects: * The pixmap of each instance of this image gets updated. * The fields in *masterPtr indicating which area of the image * is correctly dithered get updated. * *---------------------------------------------------------------------- */ static void Dither(masterPtr, x, y, width, height) PhotoMaster *masterPtr; /* Image master whose instances are * to be updated. */ int x, y; /* Coordinates of the top-left pixel * in the area to be dithered. */ int width, height; /* Dimensions of the area to be dithered. */ { PhotoInstance *instancePtr; if ((width <= 0) || (height <= 0)) { return; } for (instancePtr = masterPtr->instancePtr; instancePtr != NULL; instancePtr = instancePtr->nextPtr) { DitherInstance(instancePtr, x, y, width, height); } /* * Work out whether this block will be correctly dithered * and whether it will extend the correctly dithered region. */ if (((y < masterPtr->ditherY) || ((y == masterPtr->ditherY) && (x <= masterPtr->ditherX))) && ((y + height) > (masterPtr->ditherY))) { /* * This block starts inside (or immediately after) the correctly * dithered region, so the first scan line at least will be right. * Furthermore this block extends into scanline masterPtr->ditherY. */ if ((x == 0) && (width == masterPtr->width)) { /* * We are doing the full width, therefore the dithering * will be correct to the end. */ masterPtr->ditherX = 0; masterPtr->ditherY = y + height; } else { /* * We are doing partial scanlines, therefore the * correctly-dithered region will be extended by * at most one scan line. */ if (x <= masterPtr->ditherX) { masterPtr->ditherX = x + width; if (masterPtr->ditherX >= masterPtr->width) { masterPtr->ditherX = 0; masterPtr->ditherY++; } } } } } /* *---------------------------------------------------------------------- * * DitherInstance -- * * This procedure is called to update an area of an instance's * pixmap by dithering the corresponding area of the master. * * Results: * None. * * Side effects: * The instance's pixmap gets updated. * *---------------------------------------------------------------------- */ static void DitherInstance(instancePtr, xStart, yStart, width, height) PhotoInstance *instancePtr; /* The instance to be updated. */ int xStart, yStart; /* Coordinates of the top-left pixel in the * block to be dithered. */ int width, height; /* Dimensions of the block to be dithered. */ { PhotoMaster *masterPtr; ColorTable *colorPtr; XImage *imagePtr; int nLines, bigEndian; int i, c, x, y; int xEnd, yEnd; int bitsPerPixel, bytesPerLine, lineLength; unsigned char *srcLinePtr, *srcPtr; schar *errLinePtr, *errPtr; unsigned char *destBytePtr, *dstLinePtr; pixel *destLongPtr; pixel firstBit, word, mask; int col[3]; int doDithering = 1; colorPtr = instancePtr->colorTablePtr; masterPtr = instancePtr->masterPtr; /* * Turn dithering off in certain cases where it is not * needed (TrueColor, DirectColor with many colors). */ if ((colorPtr->visualInfo.class == DirectColor) || (colorPtr->visualInfo.class == TrueColor)) { int nRed, nGreen, nBlue, result; result = sscanf(colorPtr->id.palette, "%d/%d/%d", &nRed, &nGreen, &nBlue); if ((nRed >= 256) && ((result == 1) || ((nGreen >= 256) && (nBlue >= 256)))) { doDithering = 0; } } /* * First work out how many lines to do at a time, * then how many bytes we'll need for pixel storage, * and allocate it. */ nLines = (MAX_PIXELS + width - 1) / width; if (nLines < 1) { nLines = 1; } if (nLines > height ) { nLines = height; } imagePtr = instancePtr->imagePtr; if (imagePtr == NULL) { return; /* we must be really tight on memory */ } bitsPerPixel = imagePtr->bits_per_pixel; bytesPerLine = ((bitsPerPixel * width + 31) >> 3) & ~3; imagePtr->width = width; imagePtr->height = nLines; imagePtr->bytes_per_line = bytesPerLine; imagePtr->data = (char *) ckalloc((unsigned) (imagePtr->bytes_per_line * nLines)); bigEndian = imagePtr->bitmap_bit_order == MSBFirst; firstBit = bigEndian? (1 << (imagePtr->bitmap_unit - 1)): 1; lineLength = masterPtr->width * 3; srcLinePtr = masterPtr->pix24 + yStart * lineLength + xStart * 3; errLinePtr = instancePtr->error + yStart * lineLength + xStart * 3; xEnd = xStart + width; /* * Loop over the image, doing at most nLines lines before * updating the screen image. */ for (; height > 0; height -= nLines) { if (nLines > height) { nLines = height; } dstLinePtr = (unsigned char *) imagePtr->data; yEnd = yStart + nLines; for (y = yStart; y < yEnd; ++y) { srcPtr = srcLinePtr; errPtr = errLinePtr; destBytePtr = dstLinePtr; destLongPtr = (pixel *) dstLinePtr; if (colorPtr->flags & COLOR_WINDOW) { /* * Color window. We dither the three components * independently, using Floyd-Steinberg dithering, * which propagates errors from the quantization of * pixels to the pixels below and to the right. */ for (x = xStart; x < xEnd; ++x) { if (doDithering) { for (i = 0; i < 3; ++i) { /* * Compute the error propagated into this pixel * for this component. * If e[x,y] is the array of quantization error * values, we compute * 7/16 * e[x-1,y] + 1/16 * e[x-1,y-1] * + 5/16 * e[x,y-1] + 3/16 * e[x+1,y-1] * and round it to an integer. * * The expression ((c + 2056) >> 4) - 128 * computes round(c / 16), and works correctly on * machines without a sign-extending right shift. */ c = (x > 0) ? errPtr[-3] * 7: 0; if (y > 0) { if (x > 0) { c += errPtr[-lineLength-3]; } c += errPtr[-lineLength] * 5; if ((x + 1) < masterPtr->width) { c += errPtr[-lineLength+3] * 3; } } /* * Add the propagated error to the value of this * component, quantize it, and store the * quantization error. */ c = ((c + 2056) >> 4) - 128 + *srcPtr++; if (c < 0) { c = 0; } else if (c > 255) { c = 255; } col[i] = colorPtr->colorQuant[i][c]; *errPtr++ = c - col[i]; } } else { /* * Output is virtually continuous in this case, * so don't bother dithering. */ col[0] = *srcPtr++; col[1] = *srcPtr++; col[2] = *srcPtr++; } /* * Translate the quantized component values into * an X pixel value, and store it in the image. */ i = colorPtr->redValues[col[0]] + colorPtr->greenValues[col[1]] + colorPtr->blueValues[col[2]]; if (colorPtr->flags & MAP_COLORS) { i = colorPtr->pixelMap[i]; } switch (bitsPerPixel) { case NBBY: *destBytePtr++ = i; break; #ifndef __WIN32__ /* * This case is not valid for Windows because the image format is different * from the pixel format in Win32. Eventually we need to fix the image * code in Tk to use the Windows native image ordering. This would speed * up the image code for all of the common sizes. */ case NBBY * sizeof(pixel): *destLongPtr++ = i; break; #endif default: XPutPixel(imagePtr, x - xStart, y - yStart, (unsigned) i); } } } else if (bitsPerPixel > 1) { /* * Multibit monochrome window. The operation here is similar * to the color window case above, except that there is only * one component. If the master image is in color, use the * luminance computed as * 0.344 * red + 0.5 * green + 0.156 * blue. */ for (x = xStart; x < xEnd; ++x) { c = (x > 0) ? errPtr[-1] * 7: 0; if (y > 0) { if (x > 0) { c += errPtr[-lineLength-1]; } c += errPtr[-lineLength] * 5; if (x + 1 < masterPtr->width) { c += errPtr[-lineLength+1] * 3; } } c = ((c + 2056) >> 4) - 128; if ((masterPtr->flags & COLOR_IMAGE) == 0) { c += srcPtr[0]; } else { c += (unsigned)(srcPtr[0] * 11 + srcPtr[1] * 16 + srcPtr[2] * 5 + 16) >> 5; } srcPtr += 3; if (c < 0) { c = 0; } else if (c > 255) { c = 255; } i = colorPtr->colorQuant[0][c]; *errPtr++ = c - i; i = colorPtr->redValues[i]; switch (bitsPerPixel) { case NBBY: *destBytePtr++ = i; break; #ifndef __WIN32__ /* * This case is not valid for Windows because the image format is different * from the pixel format in Win32. Eventually we need to fix the image * code in Tk to use the Windows native image ordering. This would speed * up the image code for all of the common sizes. */ case NBBY * sizeof(pixel): *destLongPtr++ = i; break; #endif default: XPutPixel(imagePtr, x - xStart, y - yStart, (unsigned) i); } } } else { /* * 1-bit monochrome window. This is similar to the * multibit monochrome case above, except that the * quantization is simpler (we only have black = 0 * and white = 255), and we produce an XY-Bitmap. */ word = 0; mask = firstBit; for (x = xStart; x < xEnd; ++x) { /* * If we have accumulated a whole word, store it * in the image and start a new word. */ if (mask == 0) { *destLongPtr++ = word; mask = firstBit; word = 0; } c = (x > 0) ? errPtr[-1] * 7: 0; if (y > 0) { if (x > 0) { c += errPtr[-lineLength-1]; } c += errPtr[-lineLength] * 5; if (x + 1 < masterPtr->width) { c += errPtr[-lineLength+1] * 3; } } c = ((c + 2056) >> 4) - 128; if ((masterPtr->flags & COLOR_IMAGE) == 0) { c += srcPtr[0]; } else { c += (unsigned)(srcPtr[0] * 11 + srcPtr[1] * 16 + srcPtr[2] * 5 + 16) >> 5; } srcPtr += 3; if (c < 0) { c = 0; } else if (c > 255) { c = 255; } if (c >= 128) { word |= mask; *errPtr++ = c - 255; } else { *errPtr++ = c; } mask = bigEndian? (mask >> 1): (mask << 1); } *destLongPtr = word; } srcLinePtr += lineLength; errLinePtr += lineLength; dstLinePtr += bytesPerLine; } /* * Update the pixmap for this instance with the block of * pixels that we have just computed. */ TkPutImage(colorPtr->pixelMap, colorPtr->numColors, instancePtr->display, instancePtr->pixels, instancePtr->gc, imagePtr, 0, 0, xStart, yStart, (unsigned) width, (unsigned) nLines); yStart = yEnd; } ckfree(imagePtr->data); imagePtr->data = NULL; } /* *---------------------------------------------------------------------- * * Tk_PhotoBlank -- * * This procedure is called to clear an entire photo image. * * Results: * None. * * Side effects: * The valid region for the image is set to the null region. * The generic image code is notified that the image has changed. * *---------------------------------------------------------------------- */ void Tk_PhotoBlank(handle) Tk_PhotoHandle handle; /* Handle for the image to be blanked. */ { PhotoMaster *masterPtr; PhotoInstance *instancePtr; masterPtr = (PhotoMaster *) handle; masterPtr->ditherX = masterPtr->ditherY = 0; masterPtr->flags = 0; /* * The image has valid data nowhere. */ if (masterPtr->validRegion != NULL) { TkDestroyRegion(masterPtr->validRegion); } masterPtr->validRegion = TkCreateRegion(); /* * Clear out the 24-bit pixel storage array. * Clear out the dithering error arrays for each instance. */ memset((VOID *) masterPtr->pix24, 0, (size_t) (masterPtr->width * masterPtr->height * 3)); for (instancePtr = masterPtr->instancePtr; instancePtr != NULL; instancePtr = instancePtr->nextPtr) { if (instancePtr->error) { memset((VOID *) instancePtr->error, 0, (size_t) (masterPtr->width * masterPtr->height * 3 * sizeof(schar))); } } /* * Tell the core image code that this image has changed. */ Tk_ImageChanged(masterPtr->tkMaster, 0, 0, masterPtr->width, masterPtr->height, masterPtr->width, masterPtr->height); } /* *---------------------------------------------------------------------- * * Tk_PhotoExpand -- * * This procedure is called to request that a photo image be * expanded if necessary to be at least `width' pixels wide and * `height' pixels high. If the user has declared a definite * image size (using the -width and -height configuration * options) then this call has no effect. * * Results: * None. * * Side effects: * The size of the photo image may change; if so the generic * image code is informed. * *---------------------------------------------------------------------- */ void Tk_PhotoExpand(handle, width, height) Tk_PhotoHandle handle; /* Handle for the image to be expanded. */ int width, height; /* Desired minimum dimensions of the image. */ { PhotoMaster *masterPtr; masterPtr = (PhotoMaster *) handle; if (width <= masterPtr->width) { width = masterPtr->width; } if (height <= masterPtr->height) { height = masterPtr->height; } if ((width != masterPtr->width) || (height != masterPtr->height)) { ImgPhotoSetSize(masterPtr, MAX(width, masterPtr->width), MAX(height, masterPtr->height)); Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0, masterPtr->width, masterPtr->height); } } /* *---------------------------------------------------------------------- * * Tk_PhotoGetSize -- * * This procedure is called to obtain the current size of a photo * image. * * Results: * The image's width and height are returned in *widthp * and *heightp. * * Side effects: * None. * *---------------------------------------------------------------------- */ void Tk_PhotoGetSize(handle, widthPtr, heightPtr) Tk_PhotoHandle handle; /* Handle for the image whose dimensions * are requested. */ int *widthPtr, *heightPtr; /* The dimensions of the image are returned * here. */ { PhotoMaster *masterPtr; masterPtr = (PhotoMaster *) handle; *widthPtr = masterPtr->width; *heightPtr = masterPtr->height; } /* *---------------------------------------------------------------------- * * Tk_PhotoSetSize -- * * This procedure is called to set size of a photo image. * This call is equivalent to using the -width and -height * configuration options. * * Results: * None. * * Side effects: * The size of the image may change; if so the generic * image code is informed. * *---------------------------------------------------------------------- */ void Tk_PhotoSetSize(handle, width, height) Tk_PhotoHandle handle; /* Handle for the image whose size is to * be set. */ int width, height; /* New dimensions for the image. */ { PhotoMaster *masterPtr; masterPtr = (PhotoMaster *) handle; masterPtr->userWidth = width; masterPtr->userHeight = height; ImgPhotoSetSize(masterPtr, ((width > 0) ? width: masterPtr->width), ((height > 0) ? height: masterPtr->height)); Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0, masterPtr->width, masterPtr->height); } /* *---------------------------------------------------------------------- * * Tk_PhotoGetImage -- * * This procedure is called to obtain image data from a photo * image. This procedure fills in the Tk_PhotoImageBlock structure * pointed to by `blockPtr' with details of the address and * layout of the image data in memory. * * Results: * TRUE (1) indicating that image data is available, * for backwards compatibility with the old photo widget. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tk_PhotoGetImage(handle, blockPtr) Tk_PhotoHandle handle; /* Handle for the photo image from which * image data is desired. */ Tk_PhotoImageBlock *blockPtr; /* Information about the address and layout * of the image data is returned here. */ { PhotoMaster *masterPtr; masterPtr = (PhotoMaster *) handle; blockPtr->pixelPtr = masterPtr->pix24; blockPtr->width = masterPtr->width; blockPtr->height = masterPtr->height; blockPtr->pitch = masterPtr->width * 3; blockPtr->pixelSize = 3; blockPtr->offset[0] = 0; blockPtr->offset[1] = 1; blockPtr->offset[2] = 2; return 1; }