541 lines
16 KiB
C
541 lines
16 KiB
C
/*
|
||
* tkVisual.c --
|
||
*
|
||
* This file contains library procedures for allocating and
|
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* freeing visuals and colormaps. This code is based on a
|
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* prototype implementation by Paul Mackerras.
|
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*
|
||
* Copyright (c) 1994 The Regents of the University of California.
|
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* Copyright (c) 1994-1995 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.
|
||
*
|
||
* SCCS: @(#) tkVisual.c 1.18 96/02/15 18:53:08
|
||
*/
|
||
|
||
#include "tkInt.h"
|
||
#include "tkPort.h"
|
||
|
||
/*
|
||
* The table below maps from symbolic names for visual classes
|
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* to the associated X class symbols.
|
||
*/
|
||
|
||
typedef struct VisualDictionary {
|
||
char *name; /* Textual name of class. */
|
||
int minLength; /* Minimum # characters that must be
|
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* specified for an unambiguous match. */
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int class; /* X symbol for class. */
|
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} VisualDictionary;
|
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static VisualDictionary visualNames[] = {
|
||
{"best", 1, 0},
|
||
{"directcolor", 2, DirectColor},
|
||
{"grayscale", 1, GrayScale},
|
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{"greyscale", 1, GrayScale},
|
||
{"pseudocolor", 1, PseudoColor},
|
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{"staticcolor", 7, StaticColor},
|
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{"staticgray", 7, StaticGray},
|
||
{"staticgrey", 7, StaticGray},
|
||
{"truecolor", 1, TrueColor},
|
||
{NULL, 0, 0},
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||
};
|
||
|
||
/*
|
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* One of the following structures exists for each distinct non-default
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* colormap allocated for a display by Tk_GetColormap.
|
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*/
|
||
|
||
struct TkColormap {
|
||
Colormap colormap; /* X's identifier for the colormap. */
|
||
Visual *visual; /* Visual for which colormap was
|
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* allocated. */
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int refCount; /* How many uses of the colormap are still
|
||
* outstanding (calls to Tk_GetColormap
|
||
* minus calls to Tk_FreeColormap). */
|
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int shareable; /* 0 means this colormap was allocated by
|
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* a call to Tk_GetColormap with "new",
|
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* implying that the window wants it all
|
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* for itself. 1 means that the colormap
|
||
* was allocated as a default for a particular
|
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* visual, so it can be shared. */
|
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struct TkColormap *nextPtr; /* Next in list of colormaps for this display,
|
||
* or NULL for end of list. */
|
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};
|
||
|
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/*
|
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*----------------------------------------------------------------------
|
||
*
|
||
* Tk_GetVisual --
|
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*
|
||
* Given a string identifying a particular kind of visual, this
|
||
* procedure returns a visual and depth that matches the specification.
|
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*
|
||
* Results:
|
||
* The return value is normally a pointer to a visual. If an
|
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* error occurred in looking up the visual, NULL is returned and
|
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* an error message is left in interp->result. The depth of the
|
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* visual is returned to *depthPtr under normal returns. If
|
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* colormapPtr is non-NULL, then this procedure also finds a
|
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* suitable colormap for use with the visual in tkwin, and it
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* returns that colormap in *colormapPtr unless an error occurs.
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*
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* Side effects:
|
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* A new colormap may be allocated.
|
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*
|
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*----------------------------------------------------------------------
|
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*/
|
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|
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Visual *
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Tk_GetVisual(interp, tkwin, string, depthPtr, colormapPtr)
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Tcl_Interp *interp; /* Interpreter to use for error
|
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* reporting. */
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Tk_Window tkwin; /* Window in which visual will be
|
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* used. */
|
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char *string; /* String describing visual. See
|
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* manual entry for details. */
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int *depthPtr; /* The depth of the returned visual
|
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* is stored here. */
|
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Colormap *colormapPtr; /* If non-NULL, then a suitable
|
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* colormap for visual is placed here.
|
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* This colormap must eventually be
|
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* freed by calling Tk_FreeColormap. */
|
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{
|
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Tk_Window tkwin2;
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XVisualInfo template, *visInfoList, *bestPtr;
|
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long mask;
|
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Visual *visual;
|
||
int length, c, numVisuals, prio, bestPrio, i;
|
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char *p;
|
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VisualDictionary *dictPtr;
|
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TkColormap *cmapPtr;
|
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TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
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||
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/*
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* Parse string and set up a template for use in searching for
|
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* an appropriate visual.
|
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*/
|
||
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c = string[0];
|
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if (c == '.') {
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/*
|
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* The string must be a window name. If the window is on the
|
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* same screen as tkwin, then just use its visual. Otherwise
|
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* use the information about the visual as a template for the
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* search.
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*/
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||
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tkwin2 = Tk_NameToWindow(interp, string, tkwin);
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if (tkwin2 == NULL) {
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return NULL;
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}
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visual = Tk_Visual(tkwin2);
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if (Tk_Screen(tkwin) == Tk_Screen(tkwin2)) {
|
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*depthPtr = Tk_Depth(tkwin2);
|
||
if (colormapPtr != NULL) {
|
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/*
|
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* Use the colormap from the other window too (but be sure
|
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* to increment its reference count if it's one of the ones
|
||
* allocated here).
|
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*/
|
||
|
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*colormapPtr = Tk_Colormap(tkwin2);
|
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for (cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL;
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cmapPtr = cmapPtr->nextPtr) {
|
||
if (cmapPtr->colormap == *colormapPtr) {
|
||
cmapPtr->refCount += 1;
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||
break;
|
||
}
|
||
}
|
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}
|
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return visual;
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}
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template.depth = Tk_Depth(tkwin2);
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template.class = visual->class;
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template.red_mask = visual->red_mask;
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template.green_mask = visual->green_mask;
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template.blue_mask = visual->blue_mask;
|
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template.colormap_size = visual->map_entries;
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template.bits_per_rgb = visual->bits_per_rgb;
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mask = VisualDepthMask|VisualClassMask|VisualRedMaskMask
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|VisualGreenMaskMask|VisualBlueMaskMask|VisualColormapSizeMask
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|VisualBitsPerRGBMask;
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} else if ((c == 0) || ((c == 'd') && (string[1] != 0)
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&& (strncmp(string, "default", strlen(string)) == 0))) {
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/*
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* Use the default visual for the window's screen.
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*/
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||
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if (colormapPtr != NULL) {
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*colormapPtr = DefaultColormapOfScreen(Tk_Screen(tkwin));
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}
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*depthPtr = DefaultDepthOfScreen(Tk_Screen(tkwin));
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return DefaultVisualOfScreen(Tk_Screen(tkwin));
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} else if (isdigit(UCHAR(c))) {
|
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int visualId;
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||
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/*
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||
* This is a visual ID.
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*/
|
||
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if (Tcl_GetInt(interp, string, &visualId) == TCL_ERROR) {
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Tcl_ResetResult(interp);
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Tcl_AppendResult(interp, "bad X identifier for visual: ",
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string, "\"", (char *) NULL);
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return NULL;
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||
}
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||
template.visualid = visualId;
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mask = VisualIDMask;
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} else {
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/*
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||
* Parse the string into a class name (or "best") optionally
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* followed by whitespace and a depth.
|
||
*/
|
||
|
||
for (p = string; *p != 0; p++) {
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if (isspace(UCHAR(*p)) || isdigit(UCHAR(*p))) {
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break;
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}
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}
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length = p - string;
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template.class = -1;
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for (dictPtr = visualNames; dictPtr->name != NULL; dictPtr++) {
|
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if ((dictPtr->name[0] == c) && (length >= dictPtr->minLength)
|
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&& (strncmp(string, dictPtr->name,
|
||
(size_t) length) == 0)) {
|
||
template.class = dictPtr->class;
|
||
break;
|
||
}
|
||
}
|
||
if (template.class == -1) {
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Tcl_AppendResult(interp, "unknown or ambiguous visual name \"",
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string, "\": class must be ", (char *) NULL);
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for (dictPtr = visualNames; dictPtr->name != NULL; dictPtr++) {
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Tcl_AppendResult(interp, dictPtr->name, ", ", (char *) NULL);
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}
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Tcl_AppendResult(interp, "or default", (char *) NULL);
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return NULL;
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}
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while (isspace(UCHAR(*p))) {
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p++;
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}
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if (*p == 0) {
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template.depth = 10000;
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} else {
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if (Tcl_GetInt(interp, p, &template.depth) != TCL_OK) {
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return NULL;
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}
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}
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if (c == 'b') {
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mask = 0;
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} else {
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mask = VisualClassMask;
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}
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}
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/*
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* Find all visuals that match the template we've just created,
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* and return an error if there are none that match.
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*/
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||
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template.screen = Tk_ScreenNumber(tkwin);
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mask |= VisualScreenMask;
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visInfoList = XGetVisualInfo(Tk_Display(tkwin), mask, &template,
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&numVisuals);
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if (visInfoList == NULL) {
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interp->result = "couldn't find an appropriate visual";
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return NULL;
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}
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/*
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* Search through the visuals that were returned to find the best
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* one. The choice is based on the following criteria, in decreasing
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* order of importance:
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*
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* 1. Depth: choose a visual with exactly the desired depth,
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* else one with more bits than requested but as few bits
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* as possible, else one with fewer bits but as many as
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* possible.
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* 2. Class: some visual classes are more desirable than others;
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* pick the visual with the most desirable class.
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* 3. Default: the default visual for the screen gets preference
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* over other visuals, all else being equal.
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*/
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bestPrio = 0;
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bestPtr = NULL;
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for (i = 0; i < numVisuals; i++) {
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switch (visInfoList[i].class) {
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case DirectColor: prio = 5; break;
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case GrayScale: prio = 1; break;
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case PseudoColor: prio = 7; break;
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case StaticColor: prio = 3; break;
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case StaticGray: prio = 1; break;
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case TrueColor: prio = 5; break;
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default: prio = 0; break;
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}
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if (visInfoList[i].visual
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== DefaultVisualOfScreen(Tk_Screen(tkwin))) {
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prio++;
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}
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if (bestPtr == NULL) {
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goto newBest;
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}
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if (visInfoList[i].depth < bestPtr->depth) {
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if (visInfoList[i].depth >= template.depth) {
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goto newBest;
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}
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} else if (visInfoList[i].depth > bestPtr->depth) {
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if (bestPtr->depth < template.depth) {
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goto newBest;
|
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}
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} else {
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if (prio > bestPrio) {
|
||
goto newBest;
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||
}
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}
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continue;
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||
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newBest:
|
||
bestPtr = &visInfoList[i];
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bestPrio = prio;
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}
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*depthPtr = bestPtr->depth;
|
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visual = bestPtr->visual;
|
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XFree((char *) visInfoList);
|
||
|
||
/*
|
||
* If we need to find a colormap for this visual, do it now.
|
||
* If the visual is the default visual for the screen, then
|
||
* use the default colormap. Otherwise search for an existing
|
||
* colormap that's shareable. If all else fails, create a new
|
||
* colormap.
|
||
*/
|
||
|
||
if (colormapPtr != NULL) {
|
||
if (visual == DefaultVisualOfScreen(Tk_Screen(tkwin))) {
|
||
*colormapPtr = DefaultColormapOfScreen(Tk_Screen(tkwin));
|
||
} else {
|
||
for (cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL;
|
||
cmapPtr = cmapPtr->nextPtr) {
|
||
if (cmapPtr->shareable && (cmapPtr->visual == visual)) {
|
||
*colormapPtr = cmapPtr->colormap;
|
||
cmapPtr->refCount += 1;
|
||
goto done;
|
||
}
|
||
}
|
||
cmapPtr = (TkColormap *) ckalloc(sizeof(TkColormap));
|
||
cmapPtr->colormap = XCreateColormap(Tk_Display(tkwin),
|
||
RootWindowOfScreen(Tk_Screen(tkwin)), visual,
|
||
AllocNone);
|
||
cmapPtr->visual = visual;
|
||
cmapPtr->refCount = 1;
|
||
cmapPtr->shareable = 1;
|
||
cmapPtr->nextPtr = dispPtr->cmapPtr;
|
||
dispPtr->cmapPtr = cmapPtr;
|
||
*colormapPtr = cmapPtr->colormap;
|
||
}
|
||
}
|
||
|
||
done:
|
||
return visual;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tk_GetColormap --
|
||
*
|
||
* Given a string identifying a colormap, this procedure finds
|
||
* an appropriate colormap.
|
||
*
|
||
* Results:
|
||
* The return value is normally the X resource identifier for the
|
||
* colormap. If an error occurs, None is returned and an error
|
||
* message is placed in interp->result.
|
||
*
|
||
* Side effects:
|
||
* A reference count is incremented for the colormap, so
|
||
* Tk_FreeColormap must eventually be called exactly once for
|
||
* each call to Tk_GetColormap.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
Colormap
|
||
Tk_GetColormap(interp, tkwin, string)
|
||
Tcl_Interp *interp; /* Interpreter to use for error
|
||
* reporting. */
|
||
Tk_Window tkwin; /* Window where colormap will be
|
||
* used. */
|
||
char *string; /* String that identifies colormap:
|
||
* either "new" or the name of
|
||
* another window. */
|
||
{
|
||
Colormap colormap;
|
||
TkColormap *cmapPtr;
|
||
TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
|
||
Tk_Window other;
|
||
|
||
/*
|
||
* Allocate a new colormap, if that's what is wanted.
|
||
*/
|
||
|
||
if (strcmp(string, "new") == 0) {
|
||
cmapPtr = (TkColormap *) ckalloc(sizeof(TkColormap));
|
||
cmapPtr->colormap = XCreateColormap(Tk_Display(tkwin),
|
||
RootWindowOfScreen(Tk_Screen(tkwin)), Tk_Visual(tkwin),
|
||
AllocNone);
|
||
cmapPtr->visual = Tk_Visual(tkwin);
|
||
cmapPtr->refCount = 1;
|
||
cmapPtr->shareable = 0;
|
||
cmapPtr->nextPtr = dispPtr->cmapPtr;
|
||
dispPtr->cmapPtr = cmapPtr;
|
||
return cmapPtr->colormap;
|
||
}
|
||
|
||
/*
|
||
* Use a colormap from an existing window. It must have the same
|
||
* visual as tkwin (which means, among other things, that the
|
||
* other window must be on the same screen).
|
||
*/
|
||
|
||
other = Tk_NameToWindow(interp, string, tkwin);
|
||
if (other == NULL) {
|
||
return None;
|
||
}
|
||
if (Tk_Screen(other) != Tk_Screen(tkwin)) {
|
||
Tcl_AppendResult(interp, "can't use colormap for ", string,
|
||
": not on same screen", (char *) NULL);
|
||
return None;
|
||
}
|
||
if (Tk_Visual(other) != Tk_Visual(tkwin)) {
|
||
Tcl_AppendResult(interp, "can't use colormap for ", string,
|
||
": incompatible visuals", (char *) NULL);
|
||
return None;
|
||
}
|
||
colormap = Tk_Colormap(other);
|
||
|
||
/*
|
||
* If the colormap was a special one allocated by code in this file,
|
||
* increment its reference count.
|
||
*/
|
||
|
||
for (cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL;
|
||
cmapPtr = cmapPtr->nextPtr) {
|
||
if (cmapPtr->colormap == colormap) {
|
||
cmapPtr->refCount += 1;
|
||
}
|
||
}
|
||
return colormap;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tk_FreeColormap --
|
||
*
|
||
* This procedure is called to release a colormap that was
|
||
* previously allocated by Tk_GetColormap.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The colormap's reference count is decremented. If this was the
|
||
* last reference to the colormap, then the colormap is freed.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
Tk_FreeColormap(display, colormap)
|
||
Display *display; /* Display for which colormap was
|
||
* allocated. */
|
||
Colormap colormap; /* Colormap that is no longer needed.
|
||
* Must have been returned by previous
|
||
* call to Tk_GetColormap, or
|
||
* preserved by a previous call to
|
||
* Tk_PreserveColormap. */
|
||
{
|
||
TkDisplay *dispPtr;
|
||
TkColormap *cmapPtr, *prevPtr;
|
||
|
||
/*
|
||
* Find Tk's information about the display, then see if this
|
||
* colormap is a non-default one (if it's a default one, there
|
||
* won't be an entry for it in the display's list).
|
||
*/
|
||
|
||
dispPtr = TkGetDisplay(display);
|
||
if (dispPtr == NULL) {
|
||
panic("unknown display passed to Tk_FreeColormap");
|
||
}
|
||
for (prevPtr = NULL, cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL;
|
||
prevPtr = cmapPtr, cmapPtr = cmapPtr->nextPtr) {
|
||
if (cmapPtr->colormap == colormap) {
|
||
cmapPtr->refCount -= 1;
|
||
if (cmapPtr->refCount == 0) {
|
||
XFreeColormap(display, colormap);
|
||
if (prevPtr == NULL) {
|
||
dispPtr->cmapPtr = cmapPtr->nextPtr;
|
||
} else {
|
||
prevPtr->nextPtr = cmapPtr->nextPtr;
|
||
}
|
||
ckfree((char *) cmapPtr);
|
||
}
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tk_PreserveColormap --
|
||
*
|
||
* This procedure is called to indicate to Tk that the specified
|
||
* colormap is being referenced from another location and should
|
||
* not be freed until all extra references are eliminated. The
|
||
* colormap must have been returned by Tk_GetColormap.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The colormap's reference count is incremented, so
|
||
* Tk_FreeColormap must eventually be called exactly once for
|
||
* each call to Tk_PreserveColormap.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
Tk_PreserveColormap(display, colormap)
|
||
Display *display; /* Display for which colormap was
|
||
* allocated. */
|
||
Colormap colormap; /* Colormap that should be
|
||
* preserved. */
|
||
{
|
||
TkDisplay *dispPtr;
|
||
TkColormap *cmapPtr, *prevPtr;
|
||
|
||
/*
|
||
* Find Tk's information about the display, then see if this
|
||
* colormap is a non-default one (if it's a default one, there
|
||
* won't be an entry for it in the display's list).
|
||
*/
|
||
|
||
dispPtr = TkGetDisplay(display);
|
||
if (dispPtr == NULL) {
|
||
panic("unknown display passed to Tk_PreserveColormap");
|
||
}
|
||
for (prevPtr = NULL, cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL;
|
||
prevPtr = cmapPtr, cmapPtr = cmapPtr->nextPtr) {
|
||
if (cmapPtr->colormap == colormap) {
|
||
cmapPtr->refCount += 1;
|
||
return;
|
||
}
|
||
}
|
||
}
|