408 lines
12 KiB
C
408 lines
12 KiB
C
/*
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* tkUnixCursor.c --
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*
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* This file contains X specific cursor manipulation routines.
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*
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* Copyright (c) 1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkUnixCursor.c 1.4 96/10/08 09:33:08
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*/
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#include "tkPort.h"
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#include "tkInt.h"
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/*
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* The following data structure is a superset of the TkCursor structure
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* defined in tkCursor.c. Each system specific cursor module will define
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* a different cursor structure. All of these structures must have the
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* same header consisting of the fields in TkCursor.
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*/
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typedef struct {
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TkCursor info; /* Generic cursor info used by tkCursor.c */
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Display *display; /* Display for which cursor is valid. */
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} TkUnixCursor;
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/*
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* The table below is used to map from the name of a cursor to its
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* index in the official cursor font:
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*/
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static struct CursorName {
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char *name;
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unsigned int shape;
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} cursorNames[] = {
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{"X_cursor", XC_X_cursor},
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{"arrow", XC_arrow},
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{"based_arrow_down", XC_based_arrow_down},
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{"based_arrow_up", XC_based_arrow_up},
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{"boat", XC_boat},
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{"bogosity", XC_bogosity},
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{"bottom_left_corner", XC_bottom_left_corner},
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{"bottom_right_corner", XC_bottom_right_corner},
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{"bottom_side", XC_bottom_side},
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{"bottom_tee", XC_bottom_tee},
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{"box_spiral", XC_box_spiral},
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{"center_ptr", XC_center_ptr},
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{"circle", XC_circle},
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{"clock", XC_clock},
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{"coffee_mug", XC_coffee_mug},
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{"cross", XC_cross},
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{"cross_reverse", XC_cross_reverse},
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{"crosshair", XC_crosshair},
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{"diamond_cross", XC_diamond_cross},
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{"dot", XC_dot},
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{"dotbox", XC_dotbox},
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{"double_arrow", XC_double_arrow},
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{"draft_large", XC_draft_large},
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{"draft_small", XC_draft_small},
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{"draped_box", XC_draped_box},
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{"exchange", XC_exchange},
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{"fleur", XC_fleur},
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{"gobbler", XC_gobbler},
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{"gumby", XC_gumby},
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{"hand1", XC_hand1},
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{"hand2", XC_hand2},
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{"heart", XC_heart},
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{"icon", XC_icon},
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{"iron_cross", XC_iron_cross},
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{"left_ptr", XC_left_ptr},
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{"left_side", XC_left_side},
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{"left_tee", XC_left_tee},
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{"leftbutton", XC_leftbutton},
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{"ll_angle", XC_ll_angle},
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{"lr_angle", XC_lr_angle},
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{"man", XC_man},
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{"middlebutton", XC_middlebutton},
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{"mouse", XC_mouse},
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{"pencil", XC_pencil},
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{"pirate", XC_pirate},
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{"plus", XC_plus},
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{"question_arrow", XC_question_arrow},
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{"right_ptr", XC_right_ptr},
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{"right_side", XC_right_side},
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{"right_tee", XC_right_tee},
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{"rightbutton", XC_rightbutton},
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{"rtl_logo", XC_rtl_logo},
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{"sailboat", XC_sailboat},
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{"sb_down_arrow", XC_sb_down_arrow},
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{"sb_h_double_arrow", XC_sb_h_double_arrow},
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{"sb_left_arrow", XC_sb_left_arrow},
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{"sb_right_arrow", XC_sb_right_arrow},
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{"sb_up_arrow", XC_sb_up_arrow},
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{"sb_v_double_arrow", XC_sb_v_double_arrow},
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{"shuttle", XC_shuttle},
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{"sizing", XC_sizing},
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{"spider", XC_spider},
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{"spraycan", XC_spraycan},
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{"star", XC_star},
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{"target", XC_target},
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{"tcross", XC_tcross},
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{"top_left_arrow", XC_top_left_arrow},
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{"top_left_corner", XC_top_left_corner},
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{"top_right_corner", XC_top_right_corner},
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{"top_side", XC_top_side},
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{"top_tee", XC_top_tee},
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{"trek", XC_trek},
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{"ul_angle", XC_ul_angle},
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{"umbrella", XC_umbrella},
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{"ur_angle", XC_ur_angle},
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{"watch", XC_watch},
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{"xterm", XC_xterm},
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{NULL, 0}
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};
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/*
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* Font to use for cursors:
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*/
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#ifndef CURSORFONT
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#define CURSORFONT "cursor"
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#endif
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/*
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*----------------------------------------------------------------------
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*
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* TkGetCursorByName --
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*
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* Retrieve a cursor by name. Parse the cursor name into fields
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* and create a cursor, either from the standard cursor font or
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* from bitmap files.
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*
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* Results:
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* Returns a new cursor, or NULL on errors.
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*
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* Side effects:
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* Allocates a new cursor.
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*
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*----------------------------------------------------------------------
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*/
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TkCursor *
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TkGetCursorByName(interp, tkwin, string)
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Tcl_Interp *interp; /* Interpreter to use for error reporting. */
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Tk_Window tkwin; /* Window in which cursor will be used. */
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Tk_Uid string; /* Description of cursor. See manual entry
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* for details on legal syntax. */
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{
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TkUnixCursor *cursorPtr = NULL;
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Cursor cursor = None;
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int argc;
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char **argv = NULL;
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Pixmap source = None;
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Pixmap mask = None;
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Display *display = Tk_Display(tkwin);
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if (Tcl_SplitList(interp, string, &argc, &argv) != TCL_OK) {
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return NULL;
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}
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if (argc == 0) {
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goto badString;
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}
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if (argv[0][0] != '@') {
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XColor fg, bg;
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unsigned int maskIndex;
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register struct CursorName *namePtr;
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TkDisplay *dispPtr;
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/*
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* The cursor is to come from the standard cursor font. If one
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* arg, it is cursor name (use black and white for fg and bg).
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* If two args, they are name and fg color (ignore mask). If
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* three args, they are name, fg, bg. Some of the code below
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* is stolen from the XCreateFontCursor Xlib procedure.
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*/
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if (argc > 3) {
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goto badString;
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}
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for (namePtr = cursorNames; ; namePtr++) {
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if (namePtr->name == NULL) {
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goto badString;
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}
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if ((namePtr->name[0] == argv[0][0])
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&& (strcmp(namePtr->name, argv[0]) == 0)) {
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break;
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}
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}
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maskIndex = namePtr->shape + 1;
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if (argc == 1) {
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fg.red = fg.green = fg.blue = 0;
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bg.red = bg.green = bg.blue = 65535;
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} else {
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if (XParseColor(display, Tk_Colormap(tkwin), argv[1],
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&fg) == 0) {
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Tcl_AppendResult(interp, "invalid color name \"", argv[1],
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"\"", (char *) NULL);
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goto cleanup;
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}
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if (argc == 2) {
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bg.red = bg.green = bg.blue = 0;
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maskIndex = namePtr->shape;
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} else {
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if (XParseColor(display, Tk_Colormap(tkwin), argv[2],
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&bg) == 0) {
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Tcl_AppendResult(interp, "invalid color name \"", argv[2],
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"\"", (char *) NULL);
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goto cleanup;
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}
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}
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}
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dispPtr = ((TkWindow *) tkwin)->dispPtr;
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if (dispPtr->cursorFont == None) {
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dispPtr->cursorFont = XLoadFont(display, CURSORFONT);
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if (dispPtr->cursorFont == None) {
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interp->result = "couldn't load cursor font";
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goto cleanup;
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}
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}
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cursor = XCreateGlyphCursor(display, dispPtr->cursorFont,
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dispPtr->cursorFont, namePtr->shape, maskIndex,
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&fg, &bg);
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} else {
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int width, height, maskWidth, maskHeight;
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int xHot, yHot, dummy1, dummy2;
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XColor fg, bg;
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/*
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* Prevent file system access in safe interpreters.
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*/
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if (Tcl_IsSafe(interp)) {
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Tcl_AppendResult(interp, "can't get cursor from a file in",
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" a safe interpreter", (char *) NULL);
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cursorPtr = NULL;
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goto cleanup;
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}
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/*
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* The cursor is to be created by reading bitmap files. There
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* should be either two elements in the list (source, color) or
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* four (source mask fg bg).
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*/
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if ((argc != 2) && (argc != 4)) {
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goto badString;
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}
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if (TkReadBitmapFile(display,
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RootWindowOfScreen(Tk_Screen(tkwin)), &argv[0][1],
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(unsigned int *) &width, (unsigned int *) &height,
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&source, &xHot, &yHot) != BitmapSuccess) {
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Tcl_AppendResult(interp, "cleanup reading bitmap file \"",
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&argv[0][1], "\"", (char *) NULL);
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goto cleanup;
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}
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if ((xHot < 0) || (yHot < 0) || (xHot >= width) || (yHot >= height)) {
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Tcl_AppendResult(interp, "bad hot spot in bitmap file \"",
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&argv[0][1], "\"", (char *) NULL);
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goto cleanup;
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}
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if (argc == 2) {
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if (XParseColor(display, Tk_Colormap(tkwin), argv[1],
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&fg) == 0) {
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Tcl_AppendResult(interp, "invalid color name \"",
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argv[1], "\"", (char *) NULL);
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goto cleanup;
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}
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cursor = XCreatePixmapCursor(display, source, source,
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&fg, &fg, (unsigned) xHot, (unsigned) yHot);
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} else {
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if (TkReadBitmapFile(display,
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RootWindowOfScreen(Tk_Screen(tkwin)), argv[1],
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(unsigned int *) &maskWidth, (unsigned int *) &maskHeight,
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&mask, &dummy1, &dummy2) != BitmapSuccess) {
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Tcl_AppendResult(interp, "cleanup reading bitmap file \"",
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argv[1], "\"", (char *) NULL);
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goto cleanup;
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}
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if ((maskWidth != width) && (maskHeight != height)) {
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interp->result =
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"source and mask bitmaps have different sizes";
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goto cleanup;
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}
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if (XParseColor(display, Tk_Colormap(tkwin), argv[2],
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&fg) == 0) {
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Tcl_AppendResult(interp, "invalid color name \"", argv[2],
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"\"", (char *) NULL);
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goto cleanup;
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}
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if (XParseColor(display, Tk_Colormap(tkwin), argv[3],
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&bg) == 0) {
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Tcl_AppendResult(interp, "invalid color name \"", argv[3],
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"\"", (char *) NULL);
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goto cleanup;
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}
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cursor = XCreatePixmapCursor(display, source, mask,
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&fg, &bg, (unsigned) xHot, (unsigned) yHot);
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}
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}
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if (cursor != None) {
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cursorPtr = (TkUnixCursor *) ckalloc(sizeof(TkUnixCursor));
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cursorPtr->info.cursor = (Tk_Cursor) cursor;
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cursorPtr->display = display;
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}
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cleanup:
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if (argv != NULL) {
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ckfree((char *) argv);
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}
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if (source != None) {
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Tk_FreePixmap(display, source);
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}
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if (mask != None) {
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Tk_FreePixmap(display, mask);
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}
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return (TkCursor *) cursorPtr;
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badString:
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Tcl_AppendResult(interp, "bad cursor spec \"", string, "\"",
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(char *) NULL);
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return NULL;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkCreateCursorFromData --
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*
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* Creates a cursor from the source and mask bits.
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*
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* Results:
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* Returns a new cursor, or NULL on errors.
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*
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* Side effects:
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* Allocates a new cursor.
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*
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*----------------------------------------------------------------------
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*/
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TkCursor *
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TkCreateCursorFromData(tkwin, source, mask, width, height, xHot, yHot,
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fgColor, bgColor)
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Tk_Window tkwin; /* Window in which cursor will be used. */
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char *source; /* Bitmap data for cursor shape. */
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char *mask; /* Bitmap data for cursor mask. */
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int width, height; /* Dimensions of cursor. */
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int xHot, yHot; /* Location of hot-spot in cursor. */
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XColor fgColor; /* Foreground color for cursor. */
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XColor bgColor; /* Background color for cursor. */
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{
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Cursor cursor;
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Pixmap sourcePixmap, maskPixmap;
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TkUnixCursor *cursorPtr = NULL;
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Display *display = Tk_Display(tkwin);
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sourcePixmap = XCreateBitmapFromData(display,
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RootWindowOfScreen(Tk_Screen(tkwin)), source, (unsigned) width,
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(unsigned) height);
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maskPixmap = XCreateBitmapFromData(display,
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RootWindowOfScreen(Tk_Screen(tkwin)), mask, (unsigned) width,
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(unsigned) height);
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cursor = XCreatePixmapCursor(display, sourcePixmap,
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maskPixmap, &fgColor, &bgColor, (unsigned) xHot, (unsigned) yHot);
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Tk_FreePixmap(display, sourcePixmap);
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Tk_FreePixmap(display, maskPixmap);
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if (cursor != None) {
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cursorPtr = (TkUnixCursor *) ckalloc(sizeof(TkUnixCursor));
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cursorPtr->info.cursor = (Tk_Cursor) cursor;
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cursorPtr->display = display;
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}
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return (TkCursor *) cursorPtr;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkFreeCursor --
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*
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* This procedure is called to release a cursor allocated by
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* TkGetCursorByName.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The cursor data structure is deallocated.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkFreeCursor(cursorPtr)
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TkCursor *cursorPtr;
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{
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TkUnixCursor *unixCursorPtr = (TkUnixCursor *) cursorPtr;
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XFreeCursor(unixCursorPtr->display, (Cursor) unixCursorPtr->info.cursor);
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Tk_FreeXId(unixCursorPtr->display, (XID) unixCursorPtr->info.cursor);
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ckfree((char *) unixCursorPtr);
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}
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