cpython-source-deps/unix/tkUnixColor.c at tk · python/cpython-source-deps · GitHub

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* tkUnixColor.c --

* This file contains the platform specific color routines needed for X

* support.

* See the file "license.terms" for information on usage and redistribution of

* this file, and for a DISCLAIMER OF ALL WARRANTIES.

#include "tkUnixInt.h"

#include "tkColor.h"

* If a colormap fills up, attempts to allocate new colors from that colormap

* will fail. When that happens, we'll just choose the closest color from

* those that are available in the colormap. One of the following structures

* will be created for each "stressed" colormap to keep track of the colors

* that are available in the colormap (otherwise we would have to re-query

* from the server on each allocation, which would be very slow). These

* entries are flushed after a few seconds, since other clients may release or

* reallocate colors over time.

struct TkStressedCmap {

Colormap colormap; /* X's token for the colormap. */

int numColors; /* Number of entries currently active at

* *colorPtr. */

XColor *colorPtr; /* Pointer to malloc'ed array of all colors

* that seem to be available in the colormap.

* Some may not actually be available, e.g.

* because they are read-write for another

* client; when we find this out, we remove

* them from the array. */

struct TkStressedCmap *nextPtr;

/* Next in list of all stressed colormaps for

* the display. */

};

* Forward declarations for functions defined in this file:

static void DeleteStressedCmap(Display *display,

Colormap colormap);

static void FindClosestColor(Tk_Window tkwin,

XColor *desiredColorPtr, XColor *actualColorPtr);

*----------------------------------------------------------------------

* TkpFreeColor --

* Release the specified color back to the system.

* Results:

* None

* Side effects:

* Invalidates the colormap cache for the colormap associated with the

* given color.

*----------------------------------------------------------------------

void

TkpFreeColor(

TkColor *tkColPtr) /* Color to be released. Must have been

* allocated by TkpGetColor or

* TkpGetColorByValue. */

{

Visual *visual;

Screen *screen = tkColPtr->screen;

* Careful! Don't free black or white, since this will make some servers

* very unhappy. Also, there is a bug in some servers (such Sun's X11/NeWS

* server) where reference counting is performed incorrectly, so that if a

* color is allocated twice in different places and then freed twice, the

* second free generates an error (this bug existed as of 10/1/92). To get

* around this problem, ignore errors that occur during the free

* operation.

visual = tkColPtr->visual;

if ((visual->c_class != StaticGray) && (visual->c_class != StaticColor)

&& (tkColPtr->color.pixel != BlackPixelOfScreen(screen))

&& (tkColPtr->color.pixel != WhitePixelOfScreen(screen))) {

Tk_ErrorHandler handler;

handler = Tk_CreateErrorHandler(DisplayOfScreen(screen),

-1, -1, -1, NULL, NULL);

XFreeColors(DisplayOfScreen(screen), tkColPtr->colormap,

&tkColPtr->color.pixel, 1, 0L);

Tk_DeleteErrorHandler(handler);

}

DeleteStressedCmap(DisplayOfScreen(screen), tkColPtr->colormap);

}

*----------------------------------------------------------------------

* TkpGetColor --

* Allocate a new TkColor for the color with the given name.

* Results:

* Returns a newly allocated TkColor, or NULL on failure.

* Side effects:

* May invalidate the colormap cache associated with tkwin upon

* allocating a new colormap entry. Allocates a new TkColor structure.

*----------------------------------------------------------------------

TkColor *

TkpGetColor(

Tk_Window tkwin, /* Window in which color will be used. */

const char *name) /* Name of color to allocated (in form

* suitable for passing to XParseColor). */

{

Display *display = Tk_Display(tkwin);

Colormap colormap = Tk_Colormap(tkwin);

XColor color;

TkColor *tkColPtr;

* Map from the name to a pixel value. Call XAllocNamedColor rather than

* XParseColor for non-# names: this saves a server round-trip for those

* names.

if (*name != '#') {

XColor screen;

if (((*name - 'A') & 0xDF) < sizeof(tkWebColors)/sizeof(tkWebColors[0])) {

if (!((name[0] - 'G') & 0xDF) && !((name[1] - 'R') & 0xDF)

&& !((name[2] - 'A') & 0xDB) && !((name[3] - 'Y') & 0xDF)

&& !name[4]) {

name = "#808080808080";

goto gotWebColor;

} else {

const char *p = tkWebColors[((*name - 'A') & 0x1F)];

if (p) {

const char *q = name;

while (!((*p - *(++q)) & 0xDF)) {

if (!*p++) {

name = p;

goto gotWebColor;

}

if (strlen(name) > 99) {

/* Don't bother to parse this. [Bug 2809525]*/

return NULL;

} else if (XAllocNamedColor(display, colormap, name, &screen, &color) != 0) {

DeleteStressedCmap(display, colormap);

} else {

* Couldn't allocate the color. Try translating the name to a

* color value, to see whether the problem is a bad color name or

* a full colormap. If the colormap is full, then pick an

* approximation to the desired color.

if (XLookupColor(display, colormap, name, &color, &screen) == 0) {

return NULL;

}

FindClosestColor(tkwin, &screen, &color);

}

} else {

gotWebColor:

if (TkParseColor(display, colormap, name, &color) == 0) {

return NULL;

}

if (XAllocColor(display, colormap, &color) != 0) {

DeleteStressedCmap(display, colormap);

} else {

FindClosestColor(tkwin, &color, &color);

}

tkColPtr = (TkColor *)ckalloc(sizeof(TkColor));

tkColPtr->color = color;

return tkColPtr;

}

*----------------------------------------------------------------------

* TkpGetColorByValue --

* Given a desired set of red-green-blue intensities for a color, locate

* a pixel value to use to draw that color in a given window.

* Results:

* The return value is a pointer to an TkColor structure that indicates

* the closest red, blue, and green intensities available to those

* specified in colorPtr, and also specifies a pixel value to use to draw

* in that color.

* Side effects:

* May invalidate the colormap cache for the specified window. Allocates

* a new TkColor structure.

*----------------------------------------------------------------------

TkColor *

TkpGetColorByValue(

Tk_Window tkwin, /* Window in which color will be used. */

XColor *colorPtr) /* Red, green, and blue fields indicate

* desired color. */

{

Display *display = Tk_Display(tkwin);

Colormap colormap = Tk_Colormap(tkwin);

TkColor *tkColPtr = (TkColor *)ckalloc(sizeof(TkColor));

tkColPtr->color.red = colorPtr->red;

tkColPtr->color.green = colorPtr->green;

tkColPtr->color.blue = colorPtr->blue;

if (XAllocColor(display, colormap, &tkColPtr->color) != 0) {

DeleteStressedCmap(display, colormap);

} else {

FindClosestColor(tkwin, &tkColPtr->color, &tkColPtr->color);

}

return tkColPtr;

}

*----------------------------------------------------------------------

* FindClosestColor --

* When Tk can't allocate a color because a colormap has filled up, this

* function is called to find and allocate the closest available color in

* the colormap.

* Results:

* There is no return value, but *actualColorPtr is filled in with

* information about the closest available color in tkwin's colormap.

* This color has been allocated via X, so it must be released by the

* caller when the caller is done with it.

* Side effects:

* A color is allocated.

*----------------------------------------------------------------------

static void

FindClosestColor(

Tk_Window tkwin, /* Window where color will be used. */

XColor *desiredColorPtr, /* RGB values of color that was wanted (but

* unavailable). */

XColor *actualColorPtr) /* Structure to fill in with RGB and pixel for

* closest available color. */

{

TkStressedCmap *stressPtr;

double tmp, distance, closestDistance;

int i, closest, numFound;

XColor *colorPtr;

TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;

Colormap colormap = Tk_Colormap(tkwin);

XVisualInfo templ, *visInfoPtr;

* Find the TkStressedCmap structure for this colormap, or create a new

* one if needed.

for (stressPtr = dispPtr->stressPtr; ; stressPtr = stressPtr->nextPtr) {

if (stressPtr == NULL) {

stressPtr = (TkStressedCmap *)ckalloc(sizeof(TkStressedCmap));

stressPtr->colormap = colormap;

templ.visualid = XVisualIDFromVisual(Tk_Visual(tkwin));

visInfoPtr = XGetVisualInfo(Tk_Display(tkwin),

VisualIDMask, &templ, &numFound);

if (numFound < 1) {

Tcl_Panic("FindClosestColor couldn't lookup visual");

}

stressPtr->numColors = visInfoPtr->colormap_size;

XFree(visInfoPtr);

stressPtr->colorPtr = (XColor *)

ckalloc((size_t)stressPtr->numColors * sizeof(XColor));

for (i = 0; i < stressPtr->numColors; i++) {

stressPtr->colorPtr[i].pixel = (unsigned long) i;

}

XQueryColors(dispPtr->display, colormap, stressPtr->colorPtr,

stressPtr->numColors);

stressPtr->nextPtr = dispPtr->stressPtr;

dispPtr->stressPtr = stressPtr;

break;

}

if (stressPtr->colormap == colormap) {

break;

}

* Find the color that best approximates the desired one, then try to

* allocate that color. If that fails, it must mean that the color was

* read-write (so we can't use it, since it's owner might change it) or

* else it was already freed. Try again, over and over again, until

* something succeeds.

while (1) {

if (stressPtr->numColors == 0) {

Tcl_Panic("FindClosestColor ran out of colors");

}

closestDistance = 1e30;

closest = 0;

for (colorPtr = stressPtr->colorPtr, i = 0; i < stressPtr->numColors;

colorPtr++, i++) {

* Use Euclidean distance in RGB space, weighted by Y (of YIQ) as

* the objective function; this accounts for differences in the

* color sensitivity of the eye.

tmp = .30*(((int) desiredColorPtr->red) - (int) colorPtr->red);

distance = tmp*tmp;

tmp = .61*(((int) desiredColorPtr->green) - (int) colorPtr->green);

distance += tmp*tmp;

tmp = .11*(((int) desiredColorPtr->blue) - (int) colorPtr->blue);

distance += tmp*tmp;

if (distance < closestDistance) {

closest = i;

closestDistance = distance;

}

if (XAllocColor(dispPtr->display, colormap,

&stressPtr->colorPtr[closest]) != 0) {

*actualColorPtr = stressPtr->colorPtr[closest];

return;

}

* Couldn't allocate the color. Remove it from the table and go back

* to look for the next best color.

stressPtr->colorPtr[closest] =

stressPtr->colorPtr[stressPtr->numColors-1];

stressPtr->numColors -= 1;

}

*----------------------------------------------------------------------

* DeleteStressedCmap --

* This function releases the information cached for "colormap" so that

* it will be refetched from the X server the next time it is needed.

* Results:

* None.

* Side effects:

* The TkStressedCmap structure for colormap is deleted; the colormap is

* no longer considered to be "stressed".

* Note:

* This function is invoked whenever a color in a colormap is freed, and

* whenever a color allocation in a colormap succeeds. This guarantees

* that TkStressedCmap structures are always deleted before the

* corresponding Colormap is freed.

*----------------------------------------------------------------------

static void

DeleteStressedCmap(

Display *display, /* Xlib's handle for the display containing

* the colormap. */

Colormap colormap) /* Colormap to flush. */

{

TkStressedCmap *prevPtr, *stressPtr;

TkDisplay *dispPtr = TkGetDisplay(display);

for (prevPtr = NULL, stressPtr = dispPtr->stressPtr; stressPtr != NULL;

prevPtr = stressPtr, stressPtr = stressPtr->nextPtr) {

if (stressPtr->colormap == colormap) {

if (prevPtr == NULL) {

dispPtr->stressPtr = stressPtr->nextPtr;

} else {

prevPtr->nextPtr = stressPtr->nextPtr;

}

ckfree(stressPtr->colorPtr);

ckfree(stressPtr);

return;

}

*----------------------------------------------------------------------

* TkpCmapStressed --

* Check to see whether a given colormap is known to be out of entries.

* Results:

* 1 is returned if "colormap" is stressed (i.e. it has run out of

* entries recently), 0 otherwise.

* Side effects:

* None.

*----------------------------------------------------------------------

#undef TkpCmapStressed

int

TkpCmapStressed(

Tk_Window tkwin, /* Window that identifies the display

* containing the colormap. */

Colormap colormap) /* Colormap to check for stress. */

{

TkStressedCmap *stressPtr;

for (stressPtr = ((TkWindow *) tkwin)->dispPtr->stressPtr;

stressPtr != NULL; stressPtr = stressPtr->nextPtr) {

if (stressPtr->colormap == colormap) {

return 1;

}

return 0;

}

* Local Variables:

* mode: c

* c-basic-offset: 4

* fill-column: 78

* End:

cpython-source-deps/unix/tkUnixColor.c at tk · python/cpython-source-deps · GitHub

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