[2] | 1 | //======================================================================== |
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| 2 | // |
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| 3 | // SplashFont.cc |
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| 4 | // |
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| 5 | //======================================================================== |
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| 6 | |
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| 7 | #include <config.h> |
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| 8 | |
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| 9 | #ifdef USE_GCC_PRAGMAS |
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| 10 | #pragma implementation |
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| 11 | #endif |
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| 12 | |
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| 13 | #include <string.h> |
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| 14 | #include "goo/gmem.h" |
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| 15 | #include "SplashMath.h" |
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| 16 | #include "SplashGlyphBitmap.h" |
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| 17 | #include "SplashFontFile.h" |
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| 18 | #include "SplashFont.h" |
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| 19 | |
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| 20 | //------------------------------------------------------------------------ |
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| 21 | |
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| 22 | struct SplashFontCacheTag { |
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| 23 | int c; |
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| 24 | short xFrac, yFrac; // x and y fractions |
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| 25 | int mru; // valid bit (0x80000000) and MRU index |
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| 26 | int x, y, w, h; // offset and size of glyph |
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| 27 | }; |
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| 28 | |
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| 29 | //------------------------------------------------------------------------ |
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| 30 | // SplashFont |
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| 31 | //------------------------------------------------------------------------ |
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| 32 | |
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| 33 | SplashFont::SplashFont(SplashFontFile *fontFileA, SplashCoord *matA, |
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| 34 | GBool aaA) { |
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| 35 | fontFile = fontFileA; |
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| 36 | fontFile->incRefCnt(); |
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| 37 | mat[0] = matA[0]; |
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| 38 | mat[1] = matA[1]; |
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| 39 | mat[2] = matA[2]; |
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| 40 | mat[3] = matA[3]; |
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| 41 | aa = aaA; |
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| 42 | |
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| 43 | cache = NULL; |
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| 44 | cacheTags = NULL; |
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| 45 | |
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| 46 | xMin = yMin = xMax = yMax = 0; |
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| 47 | } |
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| 48 | |
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| 49 | void SplashFont::initCache() { |
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| 50 | int i; |
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| 51 | |
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| 52 | // this should be (max - min + 1), but we add some padding to |
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| 53 | // deal with rounding errors |
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| 54 | glyphW = xMax - xMin + 3; |
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| 55 | glyphH = yMax - yMin + 3; |
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| 56 | if (aa) { |
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| 57 | glyphSize = glyphW * glyphH; |
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| 58 | } else { |
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| 59 | glyphSize = ((glyphW + 7) >> 3) * glyphH; |
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| 60 | } |
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| 61 | |
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| 62 | // set up the glyph pixmap cache |
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| 63 | cacheAssoc = 8; |
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| 64 | if (glyphSize <= 256) { |
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| 65 | cacheSets = 8; |
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| 66 | } else if (glyphSize <= 512) { |
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| 67 | cacheSets = 4; |
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| 68 | } else if (glyphSize <= 1024) { |
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| 69 | cacheSets = 2; |
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| 70 | } else { |
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| 71 | cacheSets = 1; |
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| 72 | } |
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| 73 | cache = (Guchar *)gmallocn(cacheSets* cacheAssoc, glyphSize); |
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| 74 | cacheTags = (SplashFontCacheTag *)gmallocn(cacheSets * cacheAssoc, |
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| 75 | sizeof(SplashFontCacheTag)); |
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| 76 | for (i = 0; i < cacheSets * cacheAssoc; ++i) { |
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| 77 | cacheTags[i].mru = i & (cacheAssoc - 1); |
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| 78 | } |
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| 79 | } |
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| 80 | |
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| 81 | SplashFont::~SplashFont() { |
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| 82 | fontFile->decRefCnt(); |
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| 83 | if (cache) { |
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| 84 | gfree(cache); |
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| 85 | } |
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| 86 | if (cacheTags) { |
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| 87 | gfree(cacheTags); |
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| 88 | } |
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| 89 | } |
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| 90 | |
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| 91 | GBool SplashFont::getGlyph(int c, int xFrac, int yFrac, |
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| 92 | SplashGlyphBitmap *bitmap) { |
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| 93 | SplashGlyphBitmap bitmap2; |
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| 94 | int size; |
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| 95 | Guchar *p; |
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| 96 | int i, j, k; |
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| 97 | |
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| 98 | // no fractional coordinates for large glyphs or non-anti-aliased |
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| 99 | // glyphs |
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| 100 | if (!aa || glyphH > 50) { |
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| 101 | xFrac = yFrac = 0; |
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| 102 | } |
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| 103 | |
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| 104 | // check the cache |
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| 105 | i = (c & (cacheSets - 1)) * cacheAssoc; |
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| 106 | for (j = 0; j < cacheAssoc; ++j) { |
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| 107 | if ((cacheTags[i+j].mru & 0x80000000) && |
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| 108 | cacheTags[i+j].c == c && |
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| 109 | (int)cacheTags[i+j].xFrac == xFrac && |
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| 110 | (int)cacheTags[i+j].yFrac == yFrac) { |
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| 111 | bitmap->x = cacheTags[i+j].x; |
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| 112 | bitmap->y = cacheTags[i+j].y; |
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| 113 | bitmap->w = cacheTags[i+j].w; |
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| 114 | bitmap->h = cacheTags[i+j].h; |
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| 115 | for (k = 0; k < cacheAssoc; ++k) { |
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| 116 | if (k != j && |
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| 117 | (cacheTags[i+k].mru & 0x7fffffff) < |
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| 118 | (cacheTags[i+j].mru & 0x7fffffff)) { |
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| 119 | ++cacheTags[i+k].mru; |
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| 120 | } |
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| 121 | } |
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| 122 | cacheTags[i+j].mru = 0x80000000; |
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| 123 | bitmap->aa = aa; |
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| 124 | bitmap->data = cache + (i+j) * glyphSize; |
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| 125 | bitmap->freeData = gFalse; |
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| 126 | return gTrue; |
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| 127 | } |
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| 128 | } |
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| 129 | |
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| 130 | // generate the glyph bitmap |
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| 131 | if (!makeGlyph(c, xFrac, yFrac, &bitmap2)) { |
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| 132 | return gFalse; |
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| 133 | } |
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| 134 | |
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| 135 | // if the glyph doesn't fit in the bounding box, return a temporary |
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| 136 | // uncached bitmap |
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| 137 | if (bitmap2.w > glyphW || bitmap2.h > glyphH) { |
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| 138 | *bitmap = bitmap2; |
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| 139 | return gTrue; |
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| 140 | } |
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| 141 | |
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| 142 | // insert glyph pixmap in cache |
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| 143 | if (aa) { |
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| 144 | size = bitmap2.w * bitmap2.h; |
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| 145 | } else { |
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| 146 | size = ((bitmap2.w + 7) >> 3) * bitmap2.h; |
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| 147 | } |
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| 148 | p = NULL; // make gcc happy |
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| 149 | for (j = 0; j < cacheAssoc; ++j) { |
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| 150 | if ((cacheTags[i+j].mru & 0x7fffffff) == cacheAssoc - 1) { |
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| 151 | cacheTags[i+j].mru = 0x80000000; |
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| 152 | cacheTags[i+j].c = c; |
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| 153 | cacheTags[i+j].xFrac = (short)xFrac; |
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| 154 | cacheTags[i+j].yFrac = (short)yFrac; |
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| 155 | cacheTags[i+j].x = bitmap2.x; |
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| 156 | cacheTags[i+j].y = bitmap2.y; |
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| 157 | cacheTags[i+j].w = bitmap2.w; |
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| 158 | cacheTags[i+j].h = bitmap2.h; |
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| 159 | p = cache + (i+j) * glyphSize; |
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| 160 | memcpy(p, bitmap2.data, size); |
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| 161 | } else { |
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| 162 | ++cacheTags[i+j].mru; |
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| 163 | } |
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| 164 | } |
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| 165 | *bitmap = bitmap2; |
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| 166 | bitmap->data = p; |
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| 167 | bitmap->freeData = gFalse; |
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| 168 | if (bitmap2.freeData) { |
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| 169 | gfree(bitmap2.data); |
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| 170 | } |
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| 171 | return gTrue; |
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| 172 | } |
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