source/libs/poppler/poppler-src/splash/SplashFont.cc

   1 //========================================================================
   2 //
   3 // SplashFont.cc
   4 //
   5 //========================================================================
   6
   7 //========================================================================
   8 //
   9 // Modified under the Poppler project - http://poppler.freedesktop.org
  10 //
  11 // All changes made under the Poppler project to this file are licensed
  12 // under GPL version 2 or later
  13 //
  14 // Copyright (C) 2007-2008, 2010, 2014 Albert Astals Cid <aacid@kde.org>
  15 //
  16 // To see a description of the changes please see the Changelog file that
  17 // came with your tarball or type make ChangeLog if you are building from git
  18 //
  19 //========================================================================
  20
  21 #include <config.h>
  22
  23 #ifdef USE_GCC_PRAGMAS
  24 #pragma implementation
  25 #endif
  26
  27 #include <limits.h>
  28 #include <string.h>
  29 #include "goo/gmem.h"
  30 #include "SplashMath.h"
  31 #include "SplashGlyphBitmap.h"
  32 #include "SplashFontFile.h"
  33 #include "SplashFont.h"
  34
  35 //------------------------------------------------------------------------
  36
  37 struct SplashFontCacheTag {
  38   int c;
  39   short xFrac, yFrac;           // x and y fractions
  40   int mru;                      // valid bit (0x80000000) and MRU index
  41   int x, y, w, h;               // offset and size of glyph
  42 };
  43
  44 //------------------------------------------------------------------------
  45 // SplashFont
  46 //------------------------------------------------------------------------
  47
  48 SplashFont::SplashFont(SplashFontFile *fontFileA, SplashCoord *matA,
  49                        SplashCoord *textMatA, GBool aaA) {
  50   fontFile = fontFileA;
  51   fontFile->incRefCnt();
  52   mat[0] = matA[0];
  53   mat[1] = matA[1];
  54   mat[2] = matA[2];
  55   mat[3] = matA[3];
  56   textMat[0] = textMatA[0];
  57   textMat[1] = textMatA[1];
  58   textMat[2] = textMatA[2];
  59   textMat[3] = textMatA[3];
  60   aa = aaA;
  61
  62   cache = NULL;
  63   cacheTags = NULL;
  64
  65   xMin = yMin = xMax = yMax = 0;
  66 }
  67
  68 void SplashFont::initCache() {
  69   int i;
  70
  71   // this should be (max - min + 1), but we add some padding to
  72   // deal with rounding errors
  73   glyphW = xMax - xMin + 3;
  74   glyphH = yMax - yMin + 3;
  75   if (glyphW > INT_MAX / glyphH) {
  76     glyphSize = -1;
  77   } else {
  78     if (aa) {
  79       glyphSize = glyphW * glyphH;
  80     } else {
  81       glyphSize = ((glyphW + 7) >> 3) * glyphH;
  82     }
  83   }
  84
  85   // set up the glyph pixmap cache
  86   cacheAssoc = 8;
  87   if (glyphSize <= 64) {
  88     cacheSets = 32;
  89   } else if (glyphSize <= 128) {
  90     cacheSets = 16;
  91   } else if (glyphSize <= 256) {
  92     cacheSets = 8;
  93   } else if (glyphSize <= 512) {
  94     cacheSets = 4;
  95   } else if (glyphSize <= 1024) {
  96     cacheSets = 2;
  97   } else {
  98     cacheSets = 1;
  99   }
 100   cache = (Guchar *)gmallocn_checkoverflow(cacheSets* cacheAssoc, glyphSize);
 101   if (cache != NULL) {
 102     cacheTags = (SplashFontCacheTag *)gmallocn(cacheSets * cacheAssoc,
 103                                              sizeof(SplashFontCacheTag));
 104     for (i = 0; i < cacheSets * cacheAssoc; ++i) {
 105       cacheTags[i].mru = i & (cacheAssoc - 1);
 106     }
 107   } else {
 108     cacheAssoc = 0;
 109   }
 110 }
 111
 112 SplashFont::~SplashFont() {
 113   fontFile->decRefCnt();
 114   if (cache) {
 115     gfree(cache);
 116   }
 117   if (cacheTags) {
 118     gfree(cacheTags);
 119   }
 120 }
 121
 122 GBool SplashFont::getGlyph(int c, int xFrac, int yFrac,
 123                            SplashGlyphBitmap *bitmap, int x0, int y0, SplashClip *clip, SplashClipResult *clipRes) {
 124   SplashGlyphBitmap bitmap2;
 125   int size;
 126   Guchar *p;
 127   int i, j, k;
 128
 129   // no fractional coordinates for large glyphs or non-anti-aliased
 130   // glyphs
 131   if (!aa || glyphH > 50) {
 132     xFrac = yFrac = 0;
 133   }
 134
 135   // check the cache
 136   i = (c & (cacheSets - 1)) * cacheAssoc;
 137   for (j = 0; j < cacheAssoc; ++j) {
 138     if ((cacheTags[i+j].mru & 0x80000000) &&
 139         cacheTags[i+j].c == c &&
 140         (int)cacheTags[i+j].xFrac == xFrac &&
 141         (int)cacheTags[i+j].yFrac == yFrac) {
 142       bitmap->x = cacheTags[i+j].x;
 143       bitmap->y = cacheTags[i+j].y;
 144       bitmap->w = cacheTags[i+j].w;
 145       bitmap->h = cacheTags[i+j].h;
 146       for (k = 0; k < cacheAssoc; ++k) {
 147         if (k != j &&
 148             (cacheTags[i+k].mru & 0x7fffffff) <
 149               (cacheTags[i+j].mru & 0x7fffffff)) {
 150           ++cacheTags[i+k].mru;
 151         }
 152       }
 153       cacheTags[i+j].mru = 0x80000000;
 154       bitmap->aa = aa;
 155       bitmap->data = cache + (i+j) * glyphSize;
 156       bitmap->freeData = gFalse;
 157
 158       *clipRes = clip->testRect(x0 - bitmap->x,
 159                                 y0 - bitmap->y,
 160                                 x0 - bitmap->x + bitmap->w - 1,
 161                                 y0 - bitmap->y + bitmap->h - 1);
 162
 163       return gTrue;
 164     }
 165   }
 166
 167   // generate the glyph bitmap
 168   if (!makeGlyph(c, xFrac, yFrac, &bitmap2, x0, y0, clip, clipRes)) {
 169     return gFalse;
 170   }
 171
 172   if (*clipRes == splashClipAllOutside)
 173   {
 174     bitmap->freeData = gFalse;
 175     if (bitmap2.freeData) gfree(bitmap2.data);
 176     return gTrue;
 177   }
 178
 179   // if the glyph doesn't fit in the bounding box, return a temporary
 180   // uncached bitmap
 181   if (bitmap2.w > glyphW || bitmap2.h > glyphH) {
 182     *bitmap = bitmap2;
 183     return gTrue;
 184   }
 185
 186   // insert glyph pixmap in cache
 187   if (aa) {
 188     size = bitmap2.w * bitmap2.h;
 189   } else {
 190     size = ((bitmap2.w + 7) >> 3) * bitmap2.h;
 191   }
 192   p = NULL; // make gcc happy
 193   if (cacheAssoc == 0)
 194   {
 195     // we had problems on the malloc of the cache, so ignore it
 196     *bitmap = bitmap2;
 197   }
 198   else
 199   {
 200     for (j = 0; j < cacheAssoc; ++j) {
 201       if ((cacheTags[i+j].mru & 0x7fffffff) == cacheAssoc - 1) {
 202         cacheTags[i+j].mru = 0x80000000;
 203         cacheTags[i+j].c = c;
 204         cacheTags[i+j].xFrac = (short)xFrac;
 205         cacheTags[i+j].yFrac = (short)yFrac;
 206         cacheTags[i+j].x = bitmap2.x;
 207         cacheTags[i+j].y = bitmap2.y;
 208         cacheTags[i+j].w = bitmap2.w;
 209         cacheTags[i+j].h = bitmap2.h;
 210         p = cache + (i+j) * glyphSize;
 211         memcpy(p, bitmap2.data, size);
 212       } else {
 213         ++cacheTags[i+j].mru;
 214       }
 215     }
 216     *bitmap = bitmap2;
 217     bitmap->data = p;
 218     bitmap->freeData = gFalse;
 219     if (bitmap2.freeData) {
 220       gfree(bitmap2.data);
 221     }
 222   }
 223   return gTrue;
 224 }