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