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Commit | Line | Data |
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ef416fc2 | 1 | //======================================================================== |
2 | // | |
3 | // SplashT1Font.cc | |
4 | // | |
5 | //======================================================================== | |
6 | ||
7 | #include <config.h> | |
8 | ||
9 | #if HAVE_T1LIB_H | |
10 | ||
11 | #ifdef USE_GCC_PRAGMAS | |
12 | #pragma implementation | |
13 | #endif | |
14 | ||
15 | #include <stdlib.h> | |
16 | #include <t1lib.h> | |
17 | #include "gmem.h" | |
18 | #include "SplashMath.h" | |
19 | #include "SplashGlyphBitmap.h" | |
20 | #include "SplashPath.h" | |
21 | #include "SplashT1FontEngine.h" | |
22 | #include "SplashT1FontFile.h" | |
23 | #include "SplashT1Font.h" | |
24 | ||
25 | //------------------------------------------------------------------------ | |
26 | ||
27 | static Guchar bitReverse[256] = { | |
28 | 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, | |
29 | 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, | |
30 | 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, | |
31 | 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, | |
32 | 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, | |
33 | 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, | |
34 | 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, | |
35 | 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, | |
36 | 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, | |
37 | 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, | |
38 | 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, | |
39 | 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, | |
40 | 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, | |
41 | 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, | |
42 | 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, | |
43 | 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, | |
44 | 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, | |
45 | 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, | |
46 | 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, | |
47 | 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, | |
48 | 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, | |
49 | 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, | |
50 | 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, | |
51 | 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, | |
52 | 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, | |
53 | 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, | |
54 | 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, | |
55 | 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, | |
56 | 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, | |
57 | 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, | |
58 | 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, | |
59 | 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff | |
60 | }; | |
61 | ||
62 | //------------------------------------------------------------------------ | |
63 | // SplashT1Font | |
64 | //------------------------------------------------------------------------ | |
65 | ||
66 | SplashT1Font::SplashT1Font(SplashT1FontFile *fontFileA, SplashCoord *matA): | |
67 | SplashFont(fontFileA, matA, ((SplashT1FontFile *)fontFileA)->engine->aa) | |
68 | { | |
69 | T1_TMATRIX matrix; | |
70 | BBox bbox; | |
71 | SplashCoord bbx0, bby0, bbx1, bby1; | |
72 | int x, y; | |
73 | ||
74 | t1libID = T1_CopyFont(fontFileA->t1libID); | |
75 | ||
76 | // compute font size | |
77 | size = (float)splashSqrt(mat[2]*mat[2] + mat[3]*mat[3]); | |
78 | ||
79 | // transform the four corners of the font bounding box -- the min | |
80 | // and max values form the bounding box of the transformed font | |
81 | bbox = T1_GetFontBBox(t1libID); | |
82 | bbx0 = 0.001 * bbox.llx; | |
83 | bby0 = 0.001 * bbox.lly; | |
84 | bbx1 = 0.001 * bbox.urx; | |
85 | bby1 = 0.001 * bbox.ury; | |
86 | // some fonts are completely broken, so we fake it (with values | |
87 | // large enough that most glyphs should fit) | |
88 | if (bbx0 == 0 && bby0 == 0 && bbx1 == 0 && bby1 == 0) { | |
89 | bbx0 = bby0 = -0.5; | |
90 | bbx1 = bby1 = 1.5; | |
91 | } | |
92 | x = (int)(mat[0] * bbx0 + mat[2] * bby0); | |
93 | xMin = xMax = x; | |
94 | y = (int)(mat[1] * bbx0 + mat[3] * bby0); | |
95 | yMin = yMax = y; | |
96 | x = (int)(mat[0] * bbx0 + mat[2] * bby1); | |
97 | if (x < xMin) { | |
98 | xMin = x; | |
99 | } else if (x > xMax) { | |
100 | xMax = x; | |
101 | } | |
102 | y = (int)(mat[1] * bbx0 + mat[3] * bby1); | |
103 | if (y < yMin) { | |
104 | yMin = y; | |
105 | } else if (y > yMax) { | |
106 | yMax = y; | |
107 | } | |
108 | x = (int)(mat[0] * bbx1 + mat[2] * bby0); | |
109 | if (x < xMin) { | |
110 | xMin = x; | |
111 | } else if (x > xMax) { | |
112 | xMax = x; | |
113 | } | |
114 | y = (int)(mat[1] * bbx1 + mat[3] * bby0); | |
115 | if (y < yMin) { | |
116 | yMin = y; | |
117 | } else if (y > yMax) { | |
118 | yMax = y; | |
119 | } | |
120 | x = (int)(mat[0] * bbx1 + mat[2] * bby1); | |
121 | if (x < xMin) { | |
122 | xMin = x; | |
123 | } else if (x > xMax) { | |
124 | xMax = x; | |
125 | } | |
126 | y = (int)(mat[1] * bbx1 + mat[3] * bby1); | |
127 | if (y < yMin) { | |
128 | yMin = y; | |
129 | } else if (y > yMax) { | |
130 | yMax = y; | |
131 | } | |
132 | // This is a kludge: some buggy PDF generators embed fonts with | |
133 | // zero bounding boxes. | |
134 | if (xMax == xMin) { | |
135 | xMin = 0; | |
136 | xMax = (int)size; | |
137 | } | |
138 | if (yMax == yMin) { | |
139 | yMin = 0; | |
140 | yMax = (int)(1.2 * size); | |
141 | } | |
142 | // Another kludge: an unusually large xMin or yMin coordinate is | |
143 | // probably wrong. | |
144 | if (xMin > 0) { | |
145 | xMin = 0; | |
146 | } | |
147 | if (yMin > 0) { | |
148 | yMin = 0; | |
149 | } | |
150 | // Another kludge: t1lib doesn't correctly handle fonts with | |
151 | // real (non-integer) bounding box coordinates. | |
152 | if (xMax - xMin > 5000) { | |
153 | xMin = 0; | |
154 | xMax = (int)size; | |
155 | } | |
156 | if (yMax - yMin > 5000) { | |
157 | yMin = 0; | |
158 | yMax = (int)(1.2 * size); | |
159 | } | |
160 | ||
161 | // transform the font | |
162 | matrix.cxx = (double)mat[0] / size; | |
163 | matrix.cxy = (double)mat[1] / size; | |
164 | matrix.cyx = (double)mat[2] / size; | |
165 | matrix.cyy = (double)mat[3] / size; | |
166 | T1_TransformFont(t1libID, &matrix); | |
167 | } | |
168 | ||
169 | SplashT1Font::~SplashT1Font() { | |
170 | T1_DeleteFont(t1libID); | |
171 | } | |
172 | ||
173 | GBool SplashT1Font::getGlyph(int c, int xFrac, int yFrac, | |
174 | SplashGlyphBitmap *bitmap) { | |
175 | return SplashFont::getGlyph(c, 0, 0, bitmap); | |
176 | } | |
177 | ||
178 | GBool SplashT1Font::makeGlyph(int c, int xFrac, int yFrac, | |
179 | SplashGlyphBitmap *bitmap) { | |
180 | GLYPH *glyph; | |
181 | int n, i; | |
182 | ||
183 | if (aa) { | |
184 | glyph = T1_AASetChar(t1libID, c, size, NULL); | |
185 | } else { | |
186 | glyph = T1_SetChar(t1libID, c, size, NULL); | |
187 | } | |
188 | if (!glyph) { | |
189 | return gFalse; | |
190 | } | |
191 | ||
192 | bitmap->x = -glyph->metrics.leftSideBearing; | |
193 | bitmap->y = glyph->metrics.ascent; | |
194 | bitmap->w = glyph->metrics.rightSideBearing - glyph->metrics.leftSideBearing; | |
195 | bitmap->h = glyph->metrics.ascent - glyph->metrics.descent; | |
196 | bitmap->aa = aa; | |
197 | if (aa) { | |
198 | bitmap->data = (Guchar *)glyph->bits; | |
199 | bitmap->freeData = gFalse; | |
200 | } else { | |
201 | n = bitmap->h * ((bitmap->w + 7) >> 3); | |
202 | bitmap->data = (Guchar *)gmalloc(n); | |
203 | for (i = 0; i < n; ++i) { | |
204 | bitmap->data[i] = bitReverse[glyph->bits[i] & 0xff]; | |
205 | } | |
206 | bitmap->freeData = gTrue; | |
207 | } | |
208 | ||
209 | return gTrue; | |
210 | } | |
211 | ||
212 | SplashPath *SplashT1Font::getGlyphPath(int c) { | |
213 | SplashPath *path; | |
214 | T1_OUTLINE *outline; | |
215 | T1_PATHSEGMENT *seg; | |
216 | T1_BEZIERSEGMENT *bez; | |
217 | SplashCoord x, y, x1, y1; | |
218 | GBool needClose; | |
219 | ||
220 | path = new SplashPath(); | |
221 | if (!(outline = T1_GetCharOutline(t1libID, c, size, NULL))) { | |
222 | return path; | |
223 | } | |
224 | x = 0; | |
225 | y = 0; | |
226 | needClose = gFalse; | |
227 | for (seg = outline; seg; seg = seg->link) { | |
228 | switch (seg->type) { | |
229 | case T1_PATHTYPE_MOVE: | |
230 | if (needClose) { | |
231 | path->close(); | |
232 | needClose = gFalse; | |
233 | } | |
234 | x += seg->dest.x / 65536.0; | |
235 | y += seg->dest.y / 65536.0; | |
236 | path->moveTo(x, y); | |
237 | break; | |
238 | case T1_PATHTYPE_LINE: | |
239 | x += seg->dest.x / 65536.0; | |
240 | y += seg->dest.y / 65536.0; | |
241 | path->lineTo(x, y); | |
242 | needClose = gTrue; | |
243 | break; | |
244 | case T1_PATHTYPE_BEZIER: | |
245 | bez = (T1_BEZIERSEGMENT *)seg; | |
246 | x1 = x + bez->dest.x / 65536.0; | |
247 | y1 = y + bez->dest.y / 65536.0; | |
248 | path->curveTo(x + bez->B.x / 65536.0, y + bez->B.y / 65536.0, | |
249 | x + bez->C.x / 65536.0, y + bez->C.y / 65536.0, | |
250 | x1, y1); | |
251 | x = x1; | |
252 | y = y1; | |
253 | needClose = gTrue; | |
254 | break; | |
255 | } | |
256 | } | |
257 | if (needClose) { | |
258 | path->close(); | |
259 | } | |
260 | T1_FreeOutline(outline); | |
261 | return path; | |
262 | } | |
263 | ||
264 | #endif // HAVE_T1LIB_H |