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/cvs/cf.schmorp.de/Deliantra-Client/pango-render.c
Revision: 1.14
Committed: Sun Jan 13 08:22:33 2008 UTC (16 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.13: +9 -6 lines
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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
170 if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
171 {
172 glyph = pango_opengl_get_unknown_glyph (font);
173
174 if (glyph == PANGO_GLYPH_EMPTY)
175 glyph = PANGO_GLYPH_UNKNOWN_FLAG;
176 }
177
178 g = _pango_opengl_font_get_cache_glyph_data (font, glyph);
179
180 if (!g || g->generation != tc_generation)
181 {
182 Glyph bm;
183 font_render_glyph (&bm, font, glyph);
184
185 if (!g)
186 {
187 g = g_slice_new (glyph_info);
188
189 _pango_opengl_font_set_glyph_cache_destroy (font, (GDestroyNotify)free_glyph_info);
190 _pango_opengl_font_set_cache_glyph_data (font, glyph, g);
191 }
192
193 g->generation = tc_generation;
194 tc_get (&g->tex, bm.width, bm.height);
195
196 g->left = bm.left;
197 g->top = bm.top;
198
199 if (bm.width && bm.height)
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
210 x += g->left;
211 y -= g->top;
212
213 if (g->tex.name != renderer->key.texname)
214 {
215 renderer->key.texname = g->tex.name;
216 renderer->arr = rc_array (renderer->rc, &renderer->key);
217 }
218
219 rc_glyph (renderer->arr, g->tex.x, g->tex.y, g->tex.w, g->tex.h, x, y);
220 }
221
222 static void
223 draw_trapezoid (PangoRenderer *renderer_,
224 PangoRenderPart part,
225 double y1,
226 double x11,
227 double x21,
228 double y2,
229 double x12,
230 double x22)
231 {
232 PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
233 rc_key_t key = renderer->key;
234 rc_array_t *arr;
235
236 key.mode = GL_QUADS;
237 key.format = GL_V2F;
238 key.texname = 0;
239
240 arr = rc_array (renderer->rc, &key);
241
242 rc_v2f (arr, x11, y1);
243 rc_v2f (arr, x21, y1);
244 rc_v2f (arr, x22, y2);
245 rc_v2f (arr, x12, y2);
246 }
247
248 void
249 pango_opengl_render_layout_subpixel (PangoLayout *layout,
250 rc_t *rc,
251 int x, int y,
252 float r, float g, float b, float a,
253 int flags)
254 {
255 PangoContext *context;
256 PangoFontMap *fontmap;
257 PangoRenderer *renderer;
258 PangoOpenGLRenderer *gl;
259
260 context = pango_layout_get_context (layout);
261 fontmap = pango_context_get_font_map (context);
262 renderer = _pango_opengl_font_map_get_renderer (PANGO_OPENGL_FONT_MAP (fontmap));
263 gl = PANGO_OPENGL_RENDERER (renderer);
264
265 gl->rc = rc;
266 gl->r = r;
267 gl->g = g;
268 gl->b = b;
269 gl->a = a;
270 gl->flags = flags;
271
272 pango_renderer_draw_layout (renderer, layout, x, y);
273 }
274
275 void
276 pango_opengl_render_layout (PangoLayout *layout,
277 rc_t *rc,
278 int x, int y,
279 float r, float g, float b, float a,
280 int flags)
281 {
282 pango_opengl_render_layout_subpixel (
283 layout, rc, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags
284 );
285 }
286
287 static void
288 pango_opengl_renderer_init (PangoOpenGLRenderer *renderer)
289 {
290 memset (&renderer->key, 0, sizeof (rc_key_t));
291
292 renderer->r = 1.;
293 renderer->g = 1.;
294 renderer->b = 1.;
295 renderer->a = 1.;
296 }
297
298 static void
299 prepare_run (PangoRenderer *renderer, PangoLayoutRun *run)
300 {
301 PangoOpenGLRenderer *gl = (PangoOpenGLRenderer *)renderer;
302 PangoColor *fg = 0;
303 GSList *l;
304 unsigned char r, g, b, a;
305
306 renderer->underline = PANGO_UNDERLINE_NONE;
307 renderer->strikethrough = FALSE;
308
309 gl->key.mode = GL_QUADS;
310 gl->key.format = 0; // glyphs
311 gl->key.texname = 0;
312
313 for (l = run->item->analysis.extra_attrs; l; l = l->next)
314 {
315 PangoAttribute *attr = l->data;
316
317 switch (attr->klass->type)
318 {
319 case PANGO_ATTR_UNDERLINE:
320 renderer->underline = ((PangoAttrInt *)attr)->value;
321 break;
322
323 case PANGO_ATTR_STRIKETHROUGH:
324 renderer->strikethrough = ((PangoAttrInt *)attr)->value;
325 break;
326
327 case PANGO_ATTR_FOREGROUND:
328 fg = &((PangoAttrColor *)attr)->color;
329 break;
330
331 default:
332 break;
333 }
334 }
335
336 if (fg)
337 {
338 r = fg->red * (255.f / 65535.f);
339 g = fg->green * (255.f / 65535.f);
340 b = fg->blue * (255.f / 65535.f);
341 }
342 else
343 {
344 r = gl->r * 255.f;
345 g = gl->g * 255.f;
346 b = gl->b * 255.f;
347 }
348
349 a = gl->a * 255.f;
350
351 if (gl->flags & FLAG_INVERSE)
352 {
353 r ^= 0xffU;
354 g ^= 0xffU;
355 b ^= 0xffU;
356 }
357
358 gl->key.r = r;
359 gl->key.g = g;
360 gl->key.b = b;
361 gl->key.a = a;
362 }
363
364 static void
365 draw_begin (PangoRenderer *renderer_)
366 {
367 PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
368 }
369
370 static void
371 draw_end (PangoRenderer *renderer_)
372 {
373 PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
374 }
375
376 static void
377 pango_opengl_renderer_class_init (PangoOpenGLRendererClass *klass)
378 {
379 PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
380
381 renderer_class->draw_glyph = draw_glyph;
382 renderer_class->draw_trapezoid = draw_trapezoid;
383 renderer_class->prepare_run = prepare_run;
384 renderer_class->begin = draw_begin;
385 renderer_class->end = draw_end;
386 }
387