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//========================================================================
//
// SplashFont.cc
//
//========================================================================
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif
#include <string.h>
#include "gmem.h"
#include "SplashMath.h"
#include "SplashGlyphBitmap.h"
#include "SplashFontFile.h"
#include "SplashFont.h"
//------------------------------------------------------------------------
// font cache size parameters
#define splashFontCacheAssoc 8
#define splashFontCacheMaxSets 8
#define splashFontCacheSize (128*1024)
//------------------------------------------------------------------------
struct SplashFontCacheTag {
int c;
short xFrac, yFrac; // x and y fractions
int mru; // valid bit (0x80000000) and MRU index
int x, y, w, h; // offset and size of glyph
};
//------------------------------------------------------------------------
// SplashFont
//------------------------------------------------------------------------
SplashFont::SplashFont(SplashFontFile *fontFileA, SplashCoord *matA,
SplashCoord *textMatA, GBool aaA) {
fontFile = fontFileA;
fontFile->incRefCnt();
mat[0] = matA[0];
mat[1] = matA[1];
mat[2] = matA[2];
mat[3] = matA[3];
textMat[0] = textMatA[0];
textMat[1] = textMatA[1];
textMat[2] = textMatA[2];
textMat[3] = textMatA[3];
aa = aaA;
cache = NULL;
cacheTags = NULL;
xMin = yMin = xMax = yMax = 0;
}
void SplashFont::initCache() {
int i;
// this should be (max - min + 1), but we add some padding to
// deal with rounding errors
glyphW = xMax - xMin + 3;
glyphH = yMax - yMin + 3;
if (aa) {
glyphSize = glyphW * glyphH;
} else {
glyphSize = ((glyphW + 7) >> 3) * glyphH;
}
// set up the glyph pixmap cache
cacheAssoc = splashFontCacheAssoc;
for (cacheSets = splashFontCacheMaxSets;
cacheSets > 1 &&
cacheSets * cacheAssoc * glyphSize > splashFontCacheSize;
cacheSets >>= 1) ;
cache = (Guchar *)gmallocn(cacheSets * cacheAssoc, glyphSize);
cacheTags = (SplashFontCacheTag *)gmallocn(cacheSets * cacheAssoc,
sizeof(SplashFontCacheTag));
for (i = 0; i < cacheSets * cacheAssoc; ++i) {
cacheTags[i].mru = i & (cacheAssoc - 1);
}
}
SplashFont::~SplashFont() {
fontFile->decRefCnt();
if (cache) {
gfree(cache);
}
if (cacheTags) {
gfree(cacheTags);
}
}
GBool SplashFont::getGlyph(int c, int xFrac, int yFrac,
SplashGlyphBitmap *bitmap) {
SplashGlyphBitmap bitmap2;
int size;
Guchar *p;
int i, j, k;
// no fractional coordinates for large glyphs or non-anti-aliased
// glyphs
if (!aa || glyphH > 50) {
xFrac = yFrac = 0;
}
// check the cache
i = (c & (cacheSets - 1)) * cacheAssoc;
for (j = 0; j < cacheAssoc; ++j) {
if ((cacheTags[i+j].mru & 0x80000000) &&
cacheTags[i+j].c == c &&
(int)cacheTags[i+j].xFrac == xFrac &&
(int)cacheTags[i+j].yFrac == yFrac) {
bitmap->x = cacheTags[i+j].x;
bitmap->y = cacheTags[i+j].y;
bitmap->w = cacheTags[i+j].w;
bitmap->h = cacheTags[i+j].h;
for (k = 0; k < cacheAssoc; ++k) {
if (k != j &&
(cacheTags[i+k].mru & 0x7fffffff) <
(cacheTags[i+j].mru & 0x7fffffff)) {
++cacheTags[i+k].mru;
}
}
cacheTags[i+j].mru = 0x80000000;
bitmap->aa = aa;
bitmap->data = cache + (i+j) * glyphSize;
bitmap->freeData = gFalse;
return gTrue;
}
}
// generate the glyph bitmap
if (!makeGlyph(c, xFrac, yFrac, &bitmap2)) {
return gFalse;
}
// if the glyph doesn't fit in the bounding box, return a temporary
// uncached bitmap
if (bitmap2.w > glyphW || bitmap2.h > glyphH) {
*bitmap = bitmap2;
return gTrue;
}
// insert glyph pixmap in cache
if (aa) {
size = bitmap2.w * bitmap2.h;
} else {
size = ((bitmap2.w + 7) >> 3) * bitmap2.h;
}
p = NULL; // make gcc happy
for (j = 0; j < cacheAssoc; ++j) {
if ((cacheTags[i+j].mru & 0x7fffffff) == cacheAssoc - 1) {
cacheTags[i+j].mru = 0x80000000;
cacheTags[i+j].c = c;
cacheTags[i+j].xFrac = (short)xFrac;
cacheTags[i+j].yFrac = (short)yFrac;
cacheTags[i+j].x = bitmap2.x;
cacheTags[i+j].y = bitmap2.y;
cacheTags[i+j].w = bitmap2.w;
cacheTags[i+j].h = bitmap2.h;
p = cache + (i+j) * glyphSize;
memcpy(p, bitmap2.data, size);
} else {
++cacheTags[i+j].mru;
}
}
*bitmap = bitmap2;
bitmap->data = p;
bitmap->freeData = gFalse;
if (bitmap2.freeData) {
gfree(bitmap2.data);
}
return gTrue;
}
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