//======================================================================== // // SplashT1Font.cc // //======================================================================== //======================================================================== // // Modified under the Poppler project - http://poppler.freedesktop.org // // All changes made under the Poppler project to this file are licensed // under GPL version 2 or later // // Copyright (C) 2007 Albert Astals Cid // // To see a description of the changes please see the Changelog file that // came with your tarball or type make ChangeLog if you are building from git // //======================================================================== #include #if HAVE_T1LIB_H #ifdef USE_GCC_PRAGMAS #pragma implementation #endif #include #include #include "goo/gmem.h" #include "SplashMath.h" #include "SplashGlyphBitmap.h" #include "SplashPath.h" #include "SplashT1FontEngine.h" #include "SplashT1FontFile.h" #include "SplashT1Font.h" //------------------------------------------------------------------------ static Guchar bitReverse[256] = { 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff }; //------------------------------------------------------------------------ // SplashT1Font //------------------------------------------------------------------------ SplashT1Font::SplashT1Font(SplashT1FontFile *fontFileA, SplashCoord *matA, SplashCoord *textMatA): SplashFont(fontFileA, matA, textMatA, fontFileA->engine->aa) { T1_TMATRIX matrix; BBox bbox; SplashCoord bbx0, bby0, bbx1, bby1; int x, y; t1libID = T1_CopyFont(fontFileA->t1libID); outlineID = -1; // compute font size size = (float)splashDist(0, 0, mat[2], mat[3]); // transform the four corners of the font bounding box -- the min // and max values form the bounding box of the transformed font bbox = T1_GetFontBBox(t1libID); bbx0 = 0.001 * bbox.llx; bby0 = 0.001 * bbox.lly; bbx1 = 0.001 * bbox.urx; bby1 = 0.001 * bbox.ury; // some fonts are completely broken, so we fake it (with values // large enough that most glyphs should fit) if (bbx0 == 0 && bby0 == 0 && bbx1 == 0 && bby1 == 0) { bbx0 = bby0 = -0.5; bbx1 = bby1 = 1.5; } x = (int)(mat[0] * bbx0 + mat[2] * bby0); xMin = xMax = x; y = (int)(mat[1] * bbx0 + mat[3] * bby0); yMin = yMax = y; x = (int)(mat[0] * bbx0 + mat[2] * bby1); if (x < xMin) { xMin = x; } else if (x > xMax) { xMax = x; } y = (int)(mat[1] * bbx0 + mat[3] * bby1); if (y < yMin) { yMin = y; } else if (y > yMax) { yMax = y; } x = (int)(mat[0] * bbx1 + mat[2] * bby0); if (x < xMin) { xMin = x; } else if (x > xMax) { xMax = x; } y = (int)(mat[1] * bbx1 + mat[3] * bby0); if (y < yMin) { yMin = y; } else if (y > yMax) { yMax = y; } x = (int)(mat[0] * bbx1 + mat[2] * bby1); if (x < xMin) { xMin = x; } else if (x > xMax) { xMax = x; } y = (int)(mat[1] * bbx1 + mat[3] * bby1); if (y < yMin) { yMin = y; } else if (y > yMax) { yMax = y; } // This is a kludge: some buggy PDF generators embed fonts with // zero bounding boxes. if (xMax == xMin) { xMin = 0; xMax = (int)size; } if (yMax == yMin) { yMin = 0; yMax = (int)(1.2 * size); } // Another kludge: an unusually large xMin or yMin coordinate is // probably wrong. if (xMin > 0) { xMin = 0; } if (yMin > 0) { yMin = 0; } // Another kludge: t1lib doesn't correctly handle fonts with // real (non-integer) bounding box coordinates. if (xMax - xMin > 5000) { xMin = 0; xMax = (int)size; } if (yMax - yMin > 5000) { yMin = 0; yMax = (int)(1.2 * size); } // transform the font matrix.cxx = (double)mat[0] / size; matrix.cxy = (double)mat[1] / size; matrix.cyx = (double)mat[2] / size; matrix.cyy = (double)mat[3] / size; T1_TransformFont(t1libID, &matrix); } SplashT1Font::~SplashT1Font() { T1_DeleteFont(t1libID); if (outlineID >= 0) { T1_DeleteFont(outlineID); } } GBool SplashT1Font::getGlyph(int c, int xFrac, int yFrac, SplashGlyphBitmap *bitmap, int x0, int y0, SplashClip *clip, SplashClipResult *clipRes) { return SplashFont::getGlyph(c, 0, 0, bitmap, x0, y0, clip, clipRes); } GBool SplashT1Font::makeGlyph(int c, int xFrac, int yFrac, SplashGlyphBitmap *bitmap, int x0, int y0, SplashClip *clip, SplashClipResult *clipRes) { GLYPH *glyph; int n, i; if (aa) { glyph = T1_AASetChar(t1libID, c, size, NULL); } else { glyph = T1_SetChar(t1libID, c, size, NULL); } if (!glyph) { return gFalse; } bitmap->x = -glyph->metrics.leftSideBearing; bitmap->y = glyph->metrics.ascent; bitmap->w = glyph->metrics.rightSideBearing - glyph->metrics.leftSideBearing; bitmap->h = glyph->metrics.ascent - glyph->metrics.descent; bitmap->aa = aa; if (aa) { bitmap->data = (Guchar *)glyph->bits; bitmap->freeData = gFalse; } else { n = bitmap->h * ((bitmap->w + 7) >> 3); bitmap->data = (Guchar *)gmalloc(n); for (i = 0; i < n; ++i) { bitmap->data[i] = bitReverse[glyph->bits[i] & 0xff]; } bitmap->freeData = gTrue; } *clipRes = clip->testRect(x0 - bitmap->x, y0 - bitmap->y, x0 - bitmap->x + bitmap->w - 1, y0 - bitmap->y + bitmap->h - 1); return gTrue; } SplashPath *SplashT1Font::getGlyphPath(int c) { T1_TMATRIX matrix; SplashPath *path; T1_OUTLINE *outline; T1_PATHSEGMENT *seg; T1_BEZIERSEGMENT *bez; int x, y, x1, y1; GBool needClose; if (outlineID < 0) { outlineID = T1_CopyFont(((SplashT1FontFile *)fontFile)->t1libID); outlineSize = (float)splashDist(0, 0, textMat[2], textMat[3]); matrix.cxx = (double)textMat[0] / outlineSize; matrix.cxy = (double)textMat[1] / outlineSize; matrix.cyx = (double)textMat[2] / outlineSize; matrix.cyy = (double)textMat[3] / outlineSize; // t1lib doesn't seem to handle small sizes correctly here, so set // the size to 1000, and scale the resulting coordinates later outlineMul = (float)(outlineSize / 65536000.0); outlineSize = 1000; T1_TransformFont(outlineID, &matrix); } path = new SplashPath(); if ((outline = T1_GetCharOutline(outlineID, c, outlineSize, NULL))) { // NB: t1lib uses integer coordinates here; we keep a running // (x,y) total as integers, so that the final point in the path is // exactly the same as the first point, thus avoiding weird // mitered join glitches x = y = 0; needClose = gFalse; for (seg = outline; seg; seg = seg->link) { switch (seg->type) { case T1_PATHTYPE_MOVE: if (needClose) { path->close(); needClose = gFalse; } x += seg->dest.x; y += seg->dest.y; path->moveTo(outlineMul * x, -outlineMul * y); break; case T1_PATHTYPE_LINE: x += seg->dest.x; y += seg->dest.y; path->lineTo(outlineMul * x, -outlineMul * y); needClose = gTrue; break; case T1_PATHTYPE_BEZIER: bez = (T1_BEZIERSEGMENT *)seg; x1 = x + bez->dest.x; y1 = y + bez->dest.y; path->curveTo(outlineMul * (x + bez->B.x), -outlineMul * (y + bez->B.y), outlineMul * (x + bez->C.x), -outlineMul * (y + bez->C.y), outlineMul * x1, -outlineMul * y1); x = x1; y = y1; needClose = gTrue; break; } } if (needClose) { path->close(); } T1_FreeOutline(outline); } return path; } #endif // HAVE_T1LIB_H