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/cvs/cf.schmorp.de/Deliantra-Client/pango-render.c
Revision: 1.8
Committed: Sat Aug 11 11:32:29 2007 UTC (16 years, 11 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.7: +25 -20 lines
Log Message:
initial rewrite of pangorenderer => rendercache

File Contents

# Content
1 /* Pango
2 * Rendering routines to OpenGL
3 *
4 * Copyright (C) 2006 Marc Lehmann <pcg@goof.com>
5 * Copyright (C) 2004 Red Hat Software
6 * Copyright (C) 2000 Tor Lillqvist
7 *
8 * This file is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This file is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
22 */
23
24 #include <math.h>
25
26 #include "pangoopengl.h"
27
28 #define PANGO_OPENGL_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_OPENGL_RENDERER, PangoOpenGLRendererClass))
29 #define PANGO_IS_OPENGL_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_OPENGL_RENDERER))
30 #define PANGO_OPENGL_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_OPENGL_RENDERER, PangoOpenGLRendererClass))
31
32 typedef struct {
33 PangoRendererClass parent_class;
34 } PangoOpenGLRendererClass;
35
36 struct _PangoOpenGLRenderer
37 {
38 PangoRenderer parent_instance;
39 float r, g, b, a; // modulate
40 int flags;
41 rc_t *rc; // rendercache
42 rc_key_t key; // current render key
43 rc_array_t *arr;
44 };
45
46 G_DEFINE_TYPE (PangoOpenGLRenderer, pango_opengl_renderer, PANGO_TYPE_RENDERER)
47
48 typedef struct
49 {
50 uint8_t *bitmap;
51 int width, stride, height, top, left;
52 } Glyph;
53
54 static void *
55 temp_buffer (size_t size)
56 {
57 static char *buffer;
58 static size_t alloc;
59
60 if (size > alloc)
61 {
62 size = (size + 4095) & ~4095;
63 free (buffer);
64 alloc = size;
65 buffer = malloc (size);
66 }
67
68 return buffer;
69 }
70
71 static void
72 render_box (Glyph *glyph, int width, int height, int top)
73 {
74 int i;
75 int left = 0;
76
77 if (height > 2)
78 {
79 height -= 2;
80 top++;
81 }
82
83 if (width > 2)
84 {
85 width -= 2;
86 left++;
87 }
88
89 glyph->stride = (width + 3) & ~3;
90 glyph->width = width;
91 glyph->height = height;
92 glyph->top = top;
93 glyph->left = left;
94
95 glyph->bitmap = temp_buffer (width * height);
96 memset (glyph->bitmap, 0, glyph->stride * height);
97
98 for (i = width; i--; )
99 glyph->bitmap [i] = glyph->bitmap [i + (height - 1) * glyph->stride] = 0xff;
100
101 for (i = height; i--; )
102 glyph->bitmap [i * glyph->stride] = glyph->bitmap [i * glyph->stride + (width - 1)] = 0xff;
103 }
104
105 static void
106 font_render_glyph (Glyph *glyph, PangoFont *font, int glyph_index)
107 {
108 FT_Face face;
109
110 if (glyph_index & PANGO_GLYPH_UNKNOWN_FLAG)
111 {
112 PangoFontMetrics *metrics;
113
114 if (!font)
115 goto generic_box;
116
117 metrics = pango_font_get_metrics (font, NULL);
118 if (!metrics)
119 goto generic_box;
120
121 render_box (glyph, PANGO_PIXELS (metrics->approximate_char_width),
122 PANGO_PIXELS (metrics->ascent + metrics->descent),
123 PANGO_PIXELS (metrics->ascent));
124
125 pango_font_metrics_unref (metrics);
126
127 return;
128 }
129
130 face = pango_opengl_font_get_face (font);
131
132 if (face)
133 {
134 PangoOpenGLFont *glfont = (PangoOpenGLFont *)font;
135
136 FT_Load_Glyph (face, glyph_index, glfont->load_flags);
137 FT_Render_Glyph (face->glyph, ft_render_mode_normal);
138
139 glyph->width = face->glyph->bitmap.width;
140 glyph->stride = face->glyph->bitmap.pitch;
141 glyph->height = face->glyph->bitmap.rows;
142 glyph->top = face->glyph->bitmap_top;
143 glyph->left = face->glyph->bitmap_left;
144 glyph->bitmap = face->glyph->bitmap.buffer;
145 }
146 else
147 generic_box:
148 render_box (glyph, PANGO_UNKNOWN_GLYPH_WIDTH, PANGO_UNKNOWN_GLYPH_HEIGHT, PANGO_UNKNOWN_GLYPH_HEIGHT);
149 }
150
151 typedef struct glyph_info {
152 tc_area tex;
153 int left, top;
154 int generation;
155 } glyph_info;
156
157 static void
158 free_glyph_info (glyph_info *g)
159 {
160 tc_put (&g->tex);
161 g_slice_free (glyph_info, g);
162 }
163
164 static void
165 draw_glyph (PangoRenderer *renderer_, PangoFont *font, PangoGlyph glyph, double x, double y)
166 {
167 PangoOpenGLRenderer *renderer = PANGO_OPENGL_RENDERER (renderer_);
168 glyph_info *g;
169 float x1, y1, x2, y2;
170
171 if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
172 {
173 glyph = pango_opengl_get_unknown_glyph (font);
174
175 if (glyph == PANGO_GLYPH_EMPTY)
176 glyph = PANGO_GLYPH_UNKNOWN_FLAG;
177 }
178
179 g = _pango_opengl_font_get_cache_glyph_data (font, glyph);
180
181 if (!g || g->generation != tc_generation)
182 {
183 Glyph bm;
184 font_render_glyph (&bm, font, glyph);
185
186 if (g)
187 g->generation = tc_generation;
188 else
189 {
190 g = g_slice_new (glyph_info);
191
192 _pango_opengl_font_set_glyph_cache_destroy (font, (GDestroyNotify)free_glyph_info);
193 _pango_opengl_font_set_cache_glyph_data (font, glyph, g);
194 }
195
196 tc_get (&g->tex, bm.width, bm.height);
197
198 g->left = bm.left;
199 g->top = bm.top;
200
201 glBindTexture (GL_TEXTURE_2D, g->tex.name);
202 glPixelStorei (GL_UNPACK_ROW_LENGTH, bm.stride);
203 glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
204 glTexSubImage2D (GL_TEXTURE_2D, 0, g->tex.x, g->tex.y, bm.width, bm.height, GL_ALPHA, GL_UNSIGNED_BYTE, bm.bitmap);
205 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
206 glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
207 }
208
209 x += g->left;
210 y -= g->top;
211
212 x1 = g->tex.x * (1. / TC_WIDTH );
213 y1 = g->tex.y * (1. / TC_HEIGHT);
214 x2 = g->tex.w * (1. / TC_WIDTH ) + x1;
215 y2 = g->tex.h * (1. / TC_HEIGHT) + y1;
216
217 if (g->tex.name != renderer->key.texname)
218 {
219 renderer->key.texname = g->tex.name;
220 renderer->arr = rc_array (renderer->rc, &renderer->key);
221 }
222
223 rc_t2f_v3f (renderer->arr, x1, y1, x , y , 0);
224 rc_t2f_v3f (renderer->arr, x2, y1, x + g->tex.w, y , 0);
225 rc_t2f_v3f (renderer->arr, x2, y2, x + g->tex.w, y + g->tex.h, 0);
226 rc_t2f_v3f (renderer->arr, x1, y2, x , y + g->tex.h, 0);
227 }
228
229 static void
230 draw_trapezoid (PangoRenderer *renderer_,
231 PangoRenderPart part,
232 double y1,
233 double x11,
234 double x21,
235 double y2,
236 double x12,
237 double x22)
238 {
239 PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
240 rc_key_t key = renderer->key;
241 rc_array_t *arr;
242
243 key.mode = GL_QUADS;
244 key.format = GL_V2F;
245 key.texname = 0;
246
247 arr = rc_array (renderer->rc, &key);
248
249 rc_v2f (arr, x11, y1);
250 rc_v2f (arr, x21, y1);
251 rc_v2f (arr, x22, y2);
252 rc_v2f (arr, x12, y2);
253 }
254
255 void
256 pango_opengl_render_layout_subpixel (PangoLayout *layout,
257 int x, int y,
258 float r, float g, float b, float a,
259 int flags)
260 {
261 PangoContext *context;
262 PangoFontMap *fontmap;
263 PangoRenderer *renderer;
264 PangoOpenGLRenderer *gl;
265
266 context = pango_layout_get_context (layout);
267 fontmap = pango_context_get_font_map (context);
268 renderer = _pango_opengl_font_map_get_renderer (PANGO_OPENGL_FONT_MAP (fontmap));
269 gl = PANGO_OPENGL_RENDERER (renderer);
270
271 gl->rc = rc_alloc ();
272 gl->r = r;
273 gl->g = g;
274 gl->b = b;
275 gl->a = a;
276 gl->flags = flags;
277
278 pango_renderer_draw_layout (renderer, layout, x, y);
279
280 rc_free (gl->rc);
281 }
282
283 void
284 pango_opengl_render_layout (PangoLayout *layout,
285 int x, int y,
286 float r, float g, float b, float a,
287 int flags)
288 {
289 pango_opengl_render_layout_subpixel (layout, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags);
290 }
291
292 static void
293 pango_opengl_renderer_init (PangoOpenGLRenderer *renderer)
294 {
295 memset (&renderer->key, 0, sizeof (rc_key_t));
296
297 renderer->r = 1.;
298 renderer->g = 1.;
299 renderer->b = 1.;
300 renderer->a = 1.;
301 }
302
303 static void
304 prepare_run (PangoRenderer *renderer, PangoLayoutRun *run)
305 {
306 PangoOpenGLRenderer *glrenderer = (PangoOpenGLRenderer *)renderer;
307 PangoColor *fg = 0;
308 GSList *l;
309 unsigned char r, g, b, a;
310
311 renderer->underline = PANGO_UNDERLINE_NONE;
312 renderer->strikethrough = FALSE;
313
314 glrenderer->key.mode = GL_QUADS;
315 glrenderer->key.format = GL_T2F_V3F;
316 glrenderer->key.texname = 0;
317
318 for (l = run->item->analysis.extra_attrs; l; l = l->next)
319 {
320 PangoAttribute *attr = l->data;
321
322 switch (attr->klass->type)
323 {
324 case PANGO_ATTR_UNDERLINE:
325 renderer->underline = ((PangoAttrInt *)attr)->value;
326 break;
327
328 case PANGO_ATTR_STRIKETHROUGH:
329 renderer->strikethrough = ((PangoAttrInt *)attr)->value;
330 break;
331
332 case PANGO_ATTR_FOREGROUND:
333 fg = &((PangoAttrColor *)attr)->color;
334 break;
335
336 default:
337 break;
338 }
339 }
340
341 if (fg)
342 {
343 r = fg->red * (255.f / 65535.f);
344 g = fg->green * (255.f / 65535.f);
345 b = fg->blue * (255.f / 65535.f);
346 }
347 else
348 {
349 r = glrenderer->r * 255.f;
350 g = glrenderer->g * 255.f;
351 b = glrenderer->b * 255.f;
352 }
353
354 a = glrenderer->a * 255.f;
355
356 if (glrenderer->flags & FLAG_INVERSE)
357 {
358 r ^= 0xffU;
359 g ^= 0xffU;
360 b ^= 0xffU;
361 }
362
363 glrenderer->key.r = r;
364 glrenderer->key.g = g;
365 glrenderer->key.b = b;
366 glrenderer->key.a = a;
367 }
368
369 static void
370 draw_begin (PangoRenderer *renderer_)
371 {
372 PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
373
374 glEnable (GL_TEXTURE_2D);
375 glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
376 glEnable (GL_BLEND);
377 gl_BlendFuncSeparate (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
378 GL_ONE , GL_ONE_MINUS_SRC_ALPHA);
379 glEnable (GL_ALPHA_TEST);
380 glAlphaFunc (GL_GREATER, 0.01f);
381 }
382
383 static void
384 draw_end (PangoRenderer *renderer_)
385 {
386 PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
387
388 rc_draw (renderer->rc);
389
390 glDisable (GL_ALPHA_TEST);
391 glDisable (GL_BLEND);
392 glDisable (GL_TEXTURE_2D);
393 }
394
395 static void
396 pango_opengl_renderer_class_init (PangoOpenGLRendererClass *klass)
397 {
398 PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
399
400 renderer_class->draw_glyph = draw_glyph;
401 renderer_class->draw_trapezoid = draw_trapezoid;
402 renderer_class->prepare_run = prepare_run;
403 renderer_class->begin = draw_begin;
404 renderer_class->end = draw_end;
405 }
406