1 /* remove_font_transform.c
3 Part of the swftools package.
5 Copyright (c) 2010 Matthias Kramm <kramm@quiss.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
24 #include "../gfxfilter.h"
25 #include "../gfxtools.h"
26 #include "../gfxfont.h"
32 typedef struct _mymatrix {
33 float m00,m01,m10,m11;
38 static void* mymatrix_clone(const void*_m) {
41 const mymatrix_t*m1=_m;
42 mymatrix_t*m2 = malloc(sizeof(mymatrix_t));
44 m2->id = strdup(m1->id);
47 static unsigned int mymatrix_hash(const void*_m) {
50 const mymatrix_t*m = (mymatrix_t*)_m;
52 h = crc32_add_bytes(h, (char*)&m->m00, sizeof(m->m00));
53 h = crc32_add_bytes(h, (char*)&m->m01, sizeof(m->m01));
54 h = crc32_add_bytes(h, (char*)&m->m10, sizeof(m->m10));
55 h = crc32_add_bytes(h, (char*)&m->m11, sizeof(m->m11));
56 h = crc32_add_bytes(h, (char*)&m->alpha, 1);
57 h = crc32_add_string(h, m->id);
60 static void mymatrix_destroy(void*_m) {
61 mymatrix_t*m = (mymatrix_t*)_m;
65 static char mymatrix_equals(const void*_m1, const void*_m2) {
66 const mymatrix_t*m1=_m1;
67 const mymatrix_t*m2=_m2;
71 /* we do a binary comparison of the float32
72 bits here instead of a numerical comparison
73 to prevent the compiler from e.g. removing the
74 (float) cast during optimization, which would break
75 the equivalence between equals() and hash() (as
76 the hash is derived from the float32 values) */
77 return *(U32*)&m1->m00 == *(U32*)&m2->m00 &&
78 *(U32*)&m1->m01 == *(U32*)&m2->m01 &&
79 *(U32*)&m1->m10 == *(U32*)&m2->m10 &&
80 *(U32*)&m1->m11 == *(U32*)&m2->m11 &&
81 m1->alpha == m2->alpha &&
82 !strcmp(m1->id, m2->id);
84 type_t mymatrix_type = {
87 free: mymatrix_destroy,
88 equals: mymatrix_equals
91 typedef struct _internal {
98 void __attribute__((noinline))
99 matrix_convert(gfxmatrix_t*in, const char*id, mymatrix_t*out, gfxmatrix_t*scalematrix, unsigned char alpha)
101 void matrix_convert(gfxmatrix_t*in, const char*id, mymatrix_t*out, gfxmatrix_t*scalematrix, unsigned char alpha)
104 double l1 = sqrt(in->m00 * in->m00 + in->m01 * in->m01);
105 double l2 = sqrt(in->m10 * in->m10 + in->m11 * in->m11);
106 double l = (l1+l2)/2.0;
108 memset(out, 0, sizeof(*out));
111 out->m00 = in->m00 / l;
112 out->m10 = in->m10 / l;
113 out->m01 = -in->m01 / l;
114 out->m11 = -in->m11 / l;
116 out->alpha = alpha?1:0;
119 scalematrix->m00 = l;
120 scalematrix->m01 = 0;
121 scalematrix->m10 = 0;
122 scalematrix->m11 = -l;
123 scalematrix->tx = in->tx;
124 scalematrix->ty = in->ty;
128 typedef struct _matrixdata {
132 typedef struct _transformedfont {
140 static transformedfont_t* transformedfont_new(gfxfont_t*orig, mymatrix_t*m)
142 transformedfont_t*f = rfx_calloc(sizeof(transformedfont_t));
145 f->used = rfx_calloc(sizeof(f->used[0])*orig->num_glyphs);
147 for(t=0;t<orig->num_glyphs;t++) {
148 if(orig->glyphs[t].unicode==32)
149 f->used[t]=1; //always preserve the space char in fonts
154 static void pass1_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_t*color, gfxmatrix_t*matrix, gfxdevice_t*out)
156 internal_t*i = (internal_t*)f->internal;
159 msg("<error> Font has no ID");
160 matrix_convert(matrix, font->id?font->id:"unknown", &m, 0, color->a);
161 transformedfont_t*fd = dict_lookup(i->matrices, &m);
163 fd = transformedfont_new(font, &m);
164 dict_put(i->matrices, &m, fd);
167 out->drawchar(out, font, glyphnr, color, matrix);
170 static void glyph_transform(gfxglyph_t*g, mymatrix_t*mm)
181 g->line = gfxline_clone(g->line);
182 gfxline_transform(g->line, &m);
185 static gfxresult_t* pass1_finish(gfxfilter_t*f, gfxdevice_t*out)
187 internal_t*i = (internal_t*)f->internal;
188 DICT_ITERATE_DATA(i->matrices, transformedfont_t*, fd) {
189 gfxfont_t*font = fd->font = rfx_calloc(sizeof(gfxfont_t));
191 static int fontcount=0;
192 sprintf(id, "font%d", fontcount++);
193 font->id = strdup(id);
196 for(t=0;t<fd->orig->num_glyphs;t++) {
200 font->num_glyphs = count;
201 font->glyphs = rfx_calloc(sizeof(gfxglyph_t)*font->num_glyphs);
203 for(t=0;t<fd->orig->num_glyphs;t++) {
205 font->glyphs[count] = fd->orig->glyphs[t];
206 glyph_transform(&font->glyphs[count], &fd->matrix);
212 /* adjust the origin so that every character is to the
213 right of the origin */
214 gfxbbox_t total = {0,0,0,0};
215 double average_xmax = 0;
216 for(t=0;t<count;t++) {
217 gfxline_t*line = font->glyphs[t].line;
218 gfxbbox_t b = gfxline_getbbox(line);
219 total = gfxbbox_expand_to_bbox(total, b);
222 average_xmax /= count;
224 fd->dx = -total.xmin;
226 font->ascent = total.ymax;
227 font->descent = -total.ymin;
229 for(t=0;t<count;t++) {
230 gfxglyph_t*g = &font->glyphs[t];
231 gfxline_t*line = font->glyphs[t].line;
233 if(fd->matrix.alpha) {
240 gfxline_free(g->line);
241 /* for OCR: remove the outlines of characters that are only
242 ever displayed with alpha=0 */
243 g->line = (gfxline_t*)rfx_calloc(sizeof(gfxline_t));
244 g->line->type = gfx_moveTo;
245 g->line->x = g->advance;
248 gfxfont_fix_unicode(font);
250 return out->finish(out);
253 static void pass2_addfont(gfxfilter_t*f, gfxfont_t*font, gfxdevice_t*out)
255 /* we throw away original fonts, and do the addfont() for the transformed
256 fonts in the first drawchar() */
259 static void pass2_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_t*_color, gfxmatrix_t*matrix, gfxdevice_t*out)
261 internal_t*i = (internal_t*)f->internal;
262 gfxcolor_t color = *_color;
266 DICT_ITERATE_DATA(i->matrices, transformedfont_t*, fd) {
267 out->addfont(out, fd->font);
272 gfxmatrix_t scalematrix;
273 matrix_convert(matrix, font->id?font->id:"unknown", &m, &scalematrix, color.a);
274 transformedfont_t*d = dict_lookup(i->matrices, &m);
275 scalematrix.tx -= d->dx*scalematrix.m00;
277 /* if this character is invisible (alpha=0), then we will have removed the
278 outline, so we make set the alpha color channel to "fully visible" again to allow
279 output devices to be more performant (transparency is expensive) */
283 out->drawchar(out, d->font, d->used[glyphnr], &color, &scalematrix);
286 void gfxtwopassfilter_remove_font_transforms_init(gfxtwopassfilter_t*f)
288 internal_t*i = (internal_t*)rfx_calloc(sizeof(internal_t));
290 memset(f, 0, sizeof(gfxtwopassfilter_t));
291 f->type = gfxfilter_twopass;
293 f->pass1.name = "remove font transforms pass 1";
294 f->pass1.drawchar = pass1_drawchar;
295 f->pass1.finish = pass1_finish;
296 f->pass1.internal = i;
298 f->pass2.name = "remove font transforms pass 2";
299 f->pass2.addfont = pass2_addfont;
300 f->pass2.drawchar = pass2_drawchar;
301 f->pass2.internal = i;
303 i->matrices = dict_new2(&mymatrix_type);