diff options
| -rw-r--r-- | unix/tkUnixRFont.c | 150 |
1 files changed, 106 insertions, 44 deletions
diff --git a/unix/tkUnixRFont.c b/unix/tkUnixRFont.c index ab2ed4a..36e5462 100644 --- a/unix/tkUnixRFont.c +++ b/unix/tkUnixRFont.c @@ -14,6 +14,8 @@ #include <X11/Xft/Xft.h> #include <ctype.h> +#define MAX_CACHED_COLORS 16 + typedef struct { XftFont *ftFont; XftFont *ft0Font; @@ -23,6 +25,11 @@ typedef struct { } UnixFtFace; typedef struct { + XftColor color; + int next; +} UnixFtColorList; + +typedef struct { TkFont font; /* Stuff used by generic font package. Must be * first in structure. */ UnixFtFace *faces; @@ -33,7 +40,9 @@ typedef struct { Display *display; int screen; XftDraw *ftDraw; - XftColor color; + int ncolors; + int firstColor; + UnixFtColorList colors[MAX_CACHED_COLORS]; } UnixFtFont; /* @@ -289,11 +298,8 @@ InitFont( fontPtr->display = Tk_Display(tkwin); fontPtr->screen = Tk_ScreenNumber(tkwin); fontPtr->ftDraw = 0; - fontPtr->color.color.red = 0; - fontPtr->color.color.green = 0; - fontPtr->color.color.blue = 0; - fontPtr->color.color.alpha = 0xffff; - fontPtr->color.pixel = 0xffffffff; + fontPtr->ncolors = 0; + fontPtr->firstColor = -1; /* * Fill in platform-specific fields of TkFont. @@ -737,6 +743,89 @@ TkpMeasureCharsInContext( maxLength, flags, lengthPtr); } +/* + *---------------------------------------------------------------------- + * + * LookUpColor -- + * + * Convert a pixel value to an XftColor. This can be slow due to the + * need to call XQueryColor, which involves a server round-trip. To + * avoid that, a least-recently-used cache of up to MAX_CACHED_COLORS + * is kept, in the form of a linked list. The returned color is moved + * to the front of the list, so repeatedly asking for the same one + * should be fast. + * + * Results: + * A pointer to the XftColor structure for the requested color is + * returned. + * + * Side effects: + * The converted color is stored in a cache in the UnixFtFont structure. The cache + * can hold at most MAX_CACHED_COLORS colors. If no more slots are available, the least + * recently used color is replaced with the new one. + *---------------------------------------------------------------------- + */ + +static XftColor * +LookUpColor(Display *display, /* Display to lookup colors on */ + UnixFtFont *fontPtr, /* Font to search for cached colors */ + unsigned long pixel) /* Pixel value to translate to XftColor */ +{ + int i, last = -1, last2 = -1; + XColor xcolor; + + for (i = fontPtr->firstColor; + i >= 0; last2 = last, last = i, i = fontPtr->colors[i].next) { + + if (pixel == fontPtr->colors[i].color.pixel) { + /* + * Color found in cache. Move it to the front of the list and return it. + */ + if (last >= 0) { + fontPtr->colors[last].next = fontPtr->colors[i].next; + fontPtr->colors[i].next = fontPtr->firstColor; + fontPtr->firstColor = i; + } + + return &fontPtr->colors[i].color; + } + } + + /* + * Color wasn't found, so it needs to be added to the cache. + * If a spare slot is available, it can be put there. If not, last + * will now point to the least recently used color, so replace that one. + */ + + if (fontPtr->ncolors < MAX_CACHED_COLORS) { + last2 = -1; + last = fontPtr->ncolors++; + } + + /* + * Translate the pixel value to a color. Needs a server round-trip. + */ + xcolor.pixel = pixel; + XQueryColor(display, DefaultColormap(display, fontPtr->screen), &xcolor); + + fontPtr->colors[last].color.color.red = xcolor.red; + fontPtr->colors[last].color.color.green = xcolor.green; + fontPtr->colors[last].color.color.blue = xcolor.blue; + fontPtr->colors[last].color.color.alpha = 0xffff; + fontPtr->colors[last].color.pixel = pixel; + + /* + * Put at the front of the list. + */ + if (last2 >= 0) { + fontPtr->colors[last2].next = fontPtr->colors[last].next; + } + fontPtr->colors[last].next = fontPtr->firstColor; + fontPtr->firstColor = last; + + return &fontPtr->colors[last].color; +} + #define NUM_SPEC 1024 void @@ -760,7 +849,7 @@ Tk_DrawChars( const int maxCoord = 0x7FFF;/* Xft coordinates are 16 bit values */ UnixFtFont *fontPtr = (UnixFtFont *) tkfont; XGCValues values; - XColor xcolor; + XftColor *xftcolor; int clen, nspec, xStart = x; XftGlyphFontSpec specs[NUM_SPEC]; XGlyphInfo metrics; @@ -782,16 +871,7 @@ Tk_DrawChars( Tk_DeleteErrorHandler(handler); } XGetGCValues(display, gc, GCForeground, &values); - if (values.foreground != fontPtr->color.pixel) { - xcolor.pixel = values.foreground; - XQueryColor(display, DefaultColormap(display, fontPtr->screen), - &xcolor); - fontPtr->color.color.red = xcolor.red; - fontPtr->color.color.green = xcolor.green; - fontPtr->color.color.blue = xcolor.blue; - fontPtr->color.color.alpha = 0xffff; - fontPtr->color.pixel = values.foreground; - } + xftcolor = LookUpColor(display, fontPtr, values.foreground); if (tsdPtr->clipRegion != None) { XftDrawSetClip(fontPtr->ftDraw, tsdPtr->clipRegion); } @@ -823,14 +903,14 @@ Tk_DrawChars( y += metrics.yOff; nspec++; if (nspec == NUM_SPEC) { - XftDrawGlyphFontSpec(fontPtr->ftDraw, &fontPtr->color, + XftDrawGlyphFontSpec(fontPtr->ftDraw, xftcolor, specs, nspec); nspec = 0; } } } if (nspec) { - XftDrawGlyphFontSpec(fontPtr->ftDraw, &fontPtr->color, specs, nspec); + XftDrawGlyphFontSpec(fontPtr->ftDraw, xftcolor, specs, nspec); } doUnderlineStrikeout: @@ -892,7 +972,7 @@ TkDrawAngledChars( const int minCoord = -1000; /* Should be good enough... */ UnixFtFont *fontPtr = (UnixFtFont *) tkfont; XGCValues values; - XColor xcolor; + XftColor *xftcolor; int xStart = x, yStart = y; ThreadSpecificData *tsdPtr = (ThreadSpecificData *) Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); @@ -919,16 +999,7 @@ TkDrawAngledChars( } XGetGCValues(display, gc, GCForeground, &values); - if (values.foreground != fontPtr->color.pixel) { - xcolor.pixel = values.foreground; - XQueryColor(display, DefaultColormap(display, fontPtr->screen), - &xcolor); - fontPtr->color.color.red = xcolor.red; - fontPtr->color.color.green = xcolor.green; - fontPtr->color.color.blue = xcolor.blue; - fontPtr->color.color.alpha = 0xffff; - fontPtr->color.pixel = values.foreground; - } + xftcolor = LookUpColor(display, fontPtr, values.foreground); if (tsdPtr->clipRegion != None) { XftDrawSetClip(fontPtr->ftDraw, tsdPtr->clipRegion); } @@ -967,7 +1038,7 @@ TkDrawAngledChars( * this information... but we'll be ready when it does! */ - XftDrawGlyphs(fontPtr->ftDraw, &fontPtr->color, currentFtFont, + XftDrawGlyphs(fontPtr->ftDraw, xftcolor, currentFtFont, originX, originY, glyphs, nglyph); } originX = ROUND16(x); @@ -984,7 +1055,7 @@ TkDrawAngledChars( glyphs[nglyph++] = XftCharIndex(fontPtr->display, ftFont, c); } if (nglyph) { - XftDrawGlyphs(fontPtr->ftDraw, &fontPtr->color, currentFtFont, + XftDrawGlyphs(fontPtr->ftDraw, xftcolor, currentFtFont, originX, originY, glyphs, nglyph); } #else /* !XFT_HAS_FIXED_ROTATED_PLACEMENT */ @@ -1008,16 +1079,7 @@ TkDrawAngledChars( Tk_DeleteErrorHandler(handler); } XGetGCValues(display, gc, GCForeground, &values); - if (values.foreground != fontPtr->color.pixel) { - xcolor.pixel = values.foreground; - XQueryColor(display, DefaultColormap(display, fontPtr->screen), - &xcolor); - fontPtr->color.color.red = xcolor.red; - fontPtr->color.color.green = xcolor.green; - fontPtr->color.color.blue = xcolor.blue; - fontPtr->color.color.alpha = 0xffff; - fontPtr->color.pixel = values.foreground; - } + xftcolor = LookUpColor(display, fontPtr, values.foreground); if (tsdPtr->clipRegion != None) { XftDrawSetClip(fontPtr->ftDraw, tsdPtr->clipRegion); } @@ -1051,14 +1113,14 @@ TkDrawAngledChars( y += metrics.yOff*cosA - metrics.xOff*sinA; nspec++; if (nspec == NUM_SPEC) { - XftDrawGlyphFontSpec(fontPtr->ftDraw, &fontPtr->color, + XftDrawGlyphFontSpec(fontPtr->ftDraw, xftcolor, specs, nspec); nspec = 0; } } } if (nspec) { - XftDrawGlyphFontSpec(fontPtr->ftDraw, &fontPtr->color, specs, nspec); + XftDrawGlyphFontSpec(fontPtr->ftDraw, xftcolor, specs, nspec); } #endif /* XFT_HAS_FIXED_ROTATED_PLACEMENT */ |