source/libs/poppler/poppler-src/splash/SplashT1Font.cc

   1 //========================================================================
   2 //
   3 // SplashT1Font.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 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 #if HAVE_T1LIB_H
  24
  25 #ifdef USE_GCC_PRAGMAS
  26 #pragma implementation
  27 #endif
  28
  29 #include <stdlib.h>
  30 #include <t1lib.h>
  31 #include "goo/gmem.h"
  32 #include "SplashMath.h"
  33 #include "SplashGlyphBitmap.h"
  34 #include "SplashPath.h"
  35 #include "SplashT1FontEngine.h"
  36 #include "SplashT1FontFile.h"
  37 #include "SplashT1Font.h"
  38
  39 //------------------------------------------------------------------------
  40
  41 static Guchar bitReverse[256] = {
  42   0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
  43   0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
  44   0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
  45   0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
  46   0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
  47   0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
  48   0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
  49   0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
  50   0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
  51   0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
  52   0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
  53   0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
  54   0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
  55   0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
  56   0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
  57   0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
  58   0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
  59   0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
  60   0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
  61   0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
  62   0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
  63   0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
  64   0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
  65   0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
  66   0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
  67   0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
  68   0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
  69   0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
  70   0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
  71   0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
  72   0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
  73   0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
  74 };
  75
  76 //------------------------------------------------------------------------
  77 // SplashT1Font
  78 //------------------------------------------------------------------------
  79
  80 SplashT1Font::SplashT1Font(SplashT1FontFile *fontFileA, SplashCoord *matA,
  81                            SplashCoord *textMatA):
  82   SplashFont(fontFileA, matA, textMatA, fontFileA->engine->aa)
  83 {
  84   T1_TMATRIX matrix;
  85   BBox bbox;
  86   SplashCoord bbx0, bby0, bbx1, bby1;
  87   int x, y;
  88
  89   t1libID = T1_CopyFont(fontFileA->t1libID);
  90   outlineID = -1;
  91
  92   // compute font size
  93   size = (float)splashDist(0, 0, mat[2], mat[3]);
  94
  95   // transform the four corners of the font bounding box -- the min
  96   // and max values form the bounding box of the transformed font
  97   bbox = T1_GetFontBBox(t1libID);
  98   bbx0 = 0.001 * bbox.llx;
  99   bby0 = 0.001 * bbox.lly;
 100   bbx1 = 0.001 * bbox.urx;
 101   bby1 = 0.001 * bbox.ury;
 102   // some fonts are completely broken, so we fake it (with values
 103   // large enough that most glyphs should fit)
 104   if (bbx0 == 0 && bby0 == 0 && bbx1 == 0 && bby1 == 0) {
 105     bbx0 = bby0 = -0.5;
 106     bbx1 = bby1 = 1.5;
 107   }
 108   x = (int)(mat[0] * bbx0 + mat[2] * bby0);
 109   xMin = xMax = x;
 110   y = (int)(mat[1] * bbx0 + mat[3] * bby0);
 111   yMin = yMax = y;
 112   x = (int)(mat[0] * bbx0 + mat[2] * bby1);
 113   if (x < xMin) {
 114     xMin = x;
 115   } else if (x > xMax) {
 116     xMax = x;
 117   }
 118   y = (int)(mat[1] * bbx0 + mat[3] * bby1);
 119   if (y < yMin) {
 120     yMin = y;
 121   } else if (y > yMax) {
 122     yMax = y;
 123   }
 124   x = (int)(mat[0] * bbx1 + mat[2] * bby0);
 125   if (x < xMin) {
 126     xMin = x;
 127   } else if (x > xMax) {
 128     xMax = x;
 129   }
 130   y = (int)(mat[1] * bbx1 + mat[3] * bby0);
 131   if (y < yMin) {
 132     yMin = y;
 133   } else if (y > yMax) {
 134     yMax = y;
 135   }
 136   x = (int)(mat[0] * bbx1 + mat[2] * bby1);
 137   if (x < xMin) {
 138     xMin = x;
 139   } else if (x > xMax) {
 140     xMax = x;
 141   }
 142   y = (int)(mat[1] * bbx1 + mat[3] * bby1);
 143   if (y < yMin) {
 144     yMin = y;
 145   } else if (y > yMax) {
 146     yMax = y;
 147   }
 148   // This is a kludge: some buggy PDF generators embed fonts with
 149   // zero bounding boxes.
 150   if (xMax == xMin) {
 151     xMin = 0;
 152     xMax = (int)size;
 153   }
 154   if (yMax == yMin) {
 155     yMin = 0;
 156     yMax = (int)(1.2 * size);
 157   }
 158   // Another kludge: an unusually large xMin or yMin coordinate is
 159   // probably wrong.
 160   if (xMin > 0) {
 161     xMin = 0;
 162   }
 163   if (yMin > 0) {
 164     yMin = 0;
 165   }
 166   // Another kludge: t1lib doesn't correctly handle fonts with
 167   // real (non-integer) bounding box coordinates.
 168   if (xMax - xMin > 5000) {
 169     xMin = 0;
 170     xMax = (int)size;
 171   }
 172   if (yMax - yMin > 5000) {
 173     yMin = 0;
 174     yMax = (int)(1.2 * size);
 175   }
 176
 177   // transform the font
 178   matrix.cxx = (double)mat[0] / size;
 179   matrix.cxy = (double)mat[1] / size;
 180   matrix.cyx = (double)mat[2] / size;
 181   matrix.cyy = (double)mat[3] / size;
 182   T1_TransformFont(t1libID, &matrix);
 183 }
 184
 185 SplashT1Font::~SplashT1Font() {
 186   T1_DeleteFont(t1libID);
 187   if (outlineID >= 0) {
 188     T1_DeleteFont(outlineID);
 189   }
 190 }
 191
 192 GBool SplashT1Font::getGlyph(int c, int xFrac, int yFrac,
 193                              SplashGlyphBitmap *bitmap, int x0, int y0, SplashClip *clip, SplashClipResult *clipRes) {
 194   return SplashFont::getGlyph(c, 0, 0, bitmap, x0, y0, clip, clipRes);
 195 }
 196
 197 GBool SplashT1Font::makeGlyph(int c, int xFrac, int yFrac,
 198                               SplashGlyphBitmap *bitmap, int x0, int y0, SplashClip *clip, SplashClipResult *clipRes) {
 199   GLYPH *glyph;
 200   int n, i;
 201
 202   if (aa) {
 203     glyph = T1_AASetChar(t1libID, c, size, NULL);
 204   } else {
 205     glyph = T1_SetChar(t1libID, c, size, NULL);
 206   }
 207   if (!glyph) {
 208     return gFalse;
 209   }
 210
 211   bitmap->x = -glyph->metrics.leftSideBearing;
 212   bitmap->y = glyph->metrics.ascent;
 213   bitmap->w = glyph->metrics.rightSideBearing - glyph->metrics.leftSideBearing;
 214   bitmap->h = glyph->metrics.ascent - glyph->metrics.descent;
 215   bitmap->aa = aa;
 216   if (aa) {
 217     bitmap->data = (Guchar *)glyph->bits;
 218     bitmap->freeData = gFalse;
 219   } else {
 220     n = bitmap->h * ((bitmap->w + 7) >> 3);
 221     bitmap->data = (Guchar *)gmalloc(n);
 222     for (i = 0; i < n; ++i) {
 223       bitmap->data[i] = bitReverse[glyph->bits[i] & 0xff];
 224     }
 225     bitmap->freeData = gTrue;
 226   }
 227
 228   *clipRes = clip->testRect(x0 - bitmap->x,
 229                             y0 - bitmap->y,
 230                             x0 - bitmap->x + bitmap->w - 1,
 231                             y0 - bitmap->y + bitmap->h - 1);
 232
 233   return gTrue;
 234 }
 235
 236 SplashPath *SplashT1Font::getGlyphPath(int c) {
 237   T1_TMATRIX matrix;
 238   SplashPath *path;
 239   T1_OUTLINE *outline;
 240   T1_PATHSEGMENT *seg;
 241   T1_BEZIERSEGMENT *bez;
 242   int x, y, x1, y1;
 243   GBool needClose;
 244
 245   if (outlineID < 0) {
 246     outlineID = T1_CopyFont(((SplashT1FontFile *)fontFile)->t1libID);
 247     outlineSize = (float)splashDist(0, 0, textMat[2], textMat[3]);
 248     matrix.cxx = (double)textMat[0] / outlineSize;
 249     matrix.cxy = (double)textMat[1] / outlineSize;
 250     matrix.cyx = (double)textMat[2] / outlineSize;
 251     matrix.cyy = (double)textMat[3] / outlineSize;
 252     // t1lib doesn't seem to handle small sizes correctly here, so set
 253     // the size to 1000, and scale the resulting coordinates later
 254     outlineMul = (float)(outlineSize / 65536000.0);
 255     outlineSize = 1000;
 256     T1_TransformFont(outlineID, &matrix);
 257   }
 258
 259   path = new SplashPath();
 260   if ((outline = T1_GetCharOutline(outlineID, c, outlineSize, NULL))) {
 261     // NB: t1lib uses integer coordinates here; we keep a running
 262     // (x,y) total as integers, so that the final point in the path is
 263     // exactly the same as the first point, thus avoiding weird
 264     // mitered join glitches
 265     x = y = 0;
 266     needClose = gFalse;
 267     for (seg = outline; seg; seg = seg->link) {
 268       switch (seg->type) {
 269       case T1_PATHTYPE_MOVE:
 270         if (needClose) {
 271           path->close();
 272           needClose = gFalse;
 273         }
 274         x += seg->dest.x;
 275         y += seg->dest.y;
 276         path->moveTo(outlineMul * x, -outlineMul * y);
 277         break;
 278       case T1_PATHTYPE_LINE:
 279         x += seg->dest.x;
 280         y += seg->dest.y;
 281         path->lineTo(outlineMul * x, -outlineMul * y);
 282         needClose = gTrue;
 283         break;
 284       case T1_PATHTYPE_BEZIER:
 285         bez = (T1_BEZIERSEGMENT *)seg;
 286         x1 = x + bez->dest.x;
 287         y1 = y + bez->dest.y;
 288         path->curveTo(outlineMul * (x + bez->B.x),
 289                       -outlineMul * (y + bez->B.y),
 290                       outlineMul * (x + bez->C.x),
 291                       -outlineMul * (y + bez->C.y),
 292                       outlineMul * x1,
 293                       -outlineMul * y1);
 294         x = x1;
 295         y = y1;
 296         needClose = gTrue;
 297         break;
 298       }
 299     }
 300     if (needClose) {
 301       path->close();
 302     }
 303     T1_FreeOutline(outline);
 304   }
 305
 306   return path;
 307 }
 308
 309 #endif // HAVE_T1LIB_H