stk/Tk/win/tkWinImage.c

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/*
* tkWinImage.c --
*
* This file contains routines for manipulation full-color images.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkWinImage.c 1.13 97/07/07 11:19:45
*/
#include "tkWinInt.h"
static int DestroyImage _ANSI_ARGS_((XImage* data));
static unsigned long ImageGetPixel _ANSI_ARGS_((XImage *image, int x, int y));
static int PutPixel _ANSI_ARGS_((XImage *image, int x, int y,
unsigned long pixel));
/*
*----------------------------------------------------------------------
*
* DestroyImage --
*
* This is a trivial wrapper around ckfree to make it possible to
* pass ckfree as a pointer.
*
* Results:
* None.
*
* Side effects:
* Deallocates the image.
*
*----------------------------------------------------------------------
*/
int
DestroyImage(imagePtr)
XImage *imagePtr; /* image to free */
{
if (imagePtr) {
if (imagePtr->data) {
ckfree((char*)imagePtr->data);
}
ckfree((char*)imagePtr);
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* ImageGetPixel --
*
* Get a single pixel from an image.
*
* Results:
* Returns the 32 bit pixel value.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
unsigned long
ImageGetPixel(image, x, y)
XImage *image;
int x, y;
{
unsigned long pixel = 0;
unsigned char *srcPtr = &(image->data[(y * image->bytes_per_line)
+ ((x * image->bits_per_pixel) / NBBY)]);
switch (image->bits_per_pixel) {
case 32:
case 24:
pixel = RGB(srcPtr[2], srcPtr[1], srcPtr[0]);
break;
case 16:
pixel = RGB(((((WORD*)srcPtr)[0]) >> 7) & 0xf8,
((((WORD*)srcPtr)[0]) >> 2) & 0xf8,
((((WORD*)srcPtr)[0]) << 3) & 0xf8);
break;
case 8:
pixel = srcPtr[0];
break;
case 4:
pixel = ((x%2) ? (*srcPtr) : ((*srcPtr) >> 4)) & 0x0f;
break;
case 1:
pixel = ((*srcPtr) & (0x80 >> (x%8))) ? 1 : 0;
break;
}
return pixel;
}
/*
*----------------------------------------------------------------------
*
* PutPixel --
*
* Set a single pixel in an image.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
PutPixel(image, x, y, pixel)
XImage *image;
int x, y;
unsigned long pixel;
{
unsigned char *destPtr = &(image->data[(y * image->bytes_per_line)
+ ((x * image->bits_per_pixel) / NBBY)]);
switch (image->bits_per_pixel) {
case 32:
/*
* Pixel is DWORD: 0x00BBGGRR
*/
destPtr[3] = 0;
case 24:
/*
* Pixel is triplet: 0xBBGGRR.
*/
destPtr[0] = (unsigned char) GetBValue(pixel);
destPtr[1] = (unsigned char) GetGValue(pixel);
destPtr[2] = (unsigned char) GetRValue(pixel);
break;
case 16:
/*
* Pixel is WORD: 5-5-5 (R-G-B)
*/
(*(WORD*)destPtr) =
((GetRValue(pixel) & 0xf8) << 7)
| ((GetGValue(pixel) & 0xf8) <<2)
| ((GetBValue(pixel) & 0xf8) >> 3);
break;
case 8:
/*
* Pixel is 8-bit index into color table.
*/
(*destPtr) = (unsigned char) pixel;
break;
case 4:
/*
* Pixel is 4-bit index in MSBFirst order.
*/
if (x%2) {
(*destPtr) = (unsigned char) (((*destPtr) & 0xf0)
| (pixel & 0x0f));
} else {
(*destPtr) = (unsigned char) (((*destPtr) & 0x0f)
| ((pixel << 4) & 0xf0));
}
break;
case 1: {
/*
* Pixel is bit in MSBFirst order.
*/
int mask = (0x80 >> (x%8));
if (pixel) {
(*destPtr) |= mask;
} else {
(*destPtr) &= ~mask;
}
}
break;
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* XCreateImage --
*
* Allocates storage for a new XImage.
*
* Results:
* Returns a newly allocated XImage.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
XImage *
XCreateImage(display, visual, depth, format, offset, data, width, height,
bitmap_pad, bytes_per_line)
Display* display;
Visual* visual;
unsigned int depth;
int format;
int offset;
char* data;
unsigned int width;
unsigned int height;
int bitmap_pad;
int bytes_per_line;
{
XImage* imagePtr = (XImage *) ckalloc(sizeof(XImage));
imagePtr->width = width;
imagePtr->height = height;
imagePtr->xoffset = offset;
imagePtr->format = format;
imagePtr->data = data;
imagePtr->byte_order = LSBFirst;
imagePtr->bitmap_unit = 8;
imagePtr->bitmap_bit_order = MSBFirst;
imagePtr->bitmap_pad = bitmap_pad;
imagePtr->bits_per_pixel = depth;
imagePtr->depth = depth;
/*
* Under Windows, bitmap_pad must be on an LONG data-type boundary.
*/
#define LONGBITS (sizeof(LONG) * 8)
bitmap_pad = (bitmap_pad + LONGBITS - 1) / LONGBITS * LONGBITS;
/*
* Round to the nearest bitmap_pad boundary.
*/
if (bytes_per_line) {
imagePtr->bytes_per_line = bytes_per_line;
} else {
imagePtr->bytes_per_line = (((depth * width)
+ (bitmap_pad - 1)) >> 3) & ~((bitmap_pad >> 3) - 1);
}
imagePtr->red_mask = 0;
imagePtr->green_mask = 0;
imagePtr->blue_mask = 0;
imagePtr->f.put_pixel = PutPixel;
imagePtr->f.get_pixel = ImageGetPixel;
imagePtr->f.destroy_image = DestroyImage;
imagePtr->f.create_image = NULL;
imagePtr->f.sub_image = NULL;
imagePtr->f.add_pixel = NULL;
return imagePtr;
}
/*
*----------------------------------------------------------------------
*
* XGetImage --
*
* This function copies data from a pixmap or window into an
* XImage.
*
* Results:
* Returns a newly allocated image containing the data from the
* given rectangle of the given drawable.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
XImage *
XGetImage(display, d, x, y, width, height, plane_mask, format)
Display* display;
Drawable d;
int x;
int y;
unsigned int width;
unsigned int height;
unsigned long plane_mask;
int format;
{
TkWinDrawable *twdPtr = (TkWinDrawable *)d;
XImage *imagePtr;
HDC dc;
char infoBuf[sizeof(BITMAPINFO) + sizeof(RGBQUAD)];
BITMAPINFO *infoPtr = (BITMAPINFO*)infoBuf;
if ((twdPtr->type != TWD_BITMAP) || (twdPtr->bitmap.handle == NULL)
|| (format != XYPixmap) || (plane_mask != 1)) {
panic("XGetImage: not implemented");
}
imagePtr = XCreateImage(display, NULL, 1, XYBitmap, 0, NULL,
width, height, 32, 0);
imagePtr->data = ckalloc(imagePtr->bytes_per_line * imagePtr->height);
dc = GetDC(NULL);
GetDIBits(dc, twdPtr->bitmap.handle, 0, height, NULL,
infoPtr, DIB_RGB_COLORS);
infoPtr->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
infoPtr->bmiHeader.biWidth = width;
infoPtr->bmiHeader.biHeight = -(LONG)height;
infoPtr->bmiHeader.biPlanes = 1;
infoPtr->bmiHeader.biBitCount = 1;
infoPtr->bmiHeader.biCompression = BI_RGB;
infoPtr->bmiHeader.biCompression = 0;
infoPtr->bmiHeader.biXPelsPerMeter = 0;
infoPtr->bmiHeader.biYPelsPerMeter = 0;
infoPtr->bmiHeader.biClrUsed = 0;
infoPtr->bmiHeader.biClrImportant = 0;
GetDIBits(dc, twdPtr->bitmap.handle, 0, height, imagePtr->data,
infoPtr, DIB_RGB_COLORS);
ReleaseDC(NULL, dc);
return imagePtr;
}