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Revision: 1.7
Committed: Sat Aug 11 11:28:03 2007 UTC (16 years, 11 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.6: +33 -40 lines
Log Message:
need more flushes

File Contents

# User Rev Content
1 root 1.1 /* 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 root 1.6 int flags;
41 root 1.7 rc_t *rc; // rendercache
42     rc_key_t key; // current render key
43     rc_array_t *arr;
44 root 1.1 };
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 root 1.2 FT_Face face;
109    
110 root 1.1 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 root 1.2 face = pango_opengl_font_get_face (font);
131 root 1.1
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 root 1.3 int generation;
155 root 1.1 } 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 root 1.2 glyph_info *g;
169     float x1, y1, x2, y2;
170 root 1.1
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 root 1.2 g = _pango_opengl_font_get_cache_glyph_data (font, glyph);
180 root 1.1
181 root 1.3 if (!g || g->generation != tc_generation)
182 root 1.1 {
183     Glyph bm;
184     font_render_glyph (&bm, font, glyph);
185    
186 root 1.3 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 root 1.1
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 root 1.2 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 root 1.1
217 root 1.7 if (g->tex.name != renderer->key.texname)
218 root 1.1 {
219 root 1.7 renderer->key.texname = g->tex.name;
220     renderer->arr = rc_array (renderer->rc, &renderer->key);
221 root 1.1 }
222    
223 root 1.7 rc_t2f_v3f (x1, y1, x , y , 0);
224     rc_t2f_v3f (x2, y1, x + g->tex.w, y , 0);
225     rc_t2f_v3f (x2, y2, x + g->tex.w, y + g->tex.h, 0);
226     rc_t2f_v3f (x1, y2, x , y + g->tex.h, 0);
227 root 1.1 }
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 root 1.7 rc_key_t key = renderer->key;
241     rc_array_t *arr;
242 root 1.1
243 root 1.7 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 (x11, y1);
250     rc_v2f (x21, y1);
251     rc_v2f (x22, y2);
252     rc_v2f (x12, y2);
253 root 1.1 }
254    
255     void
256     pango_opengl_render_layout_subpixel (PangoLayout *layout,
257     int x, int y,
258 root 1.6 float r, float g, float b, float a,
259     int flags)
260 root 1.1 {
261     PangoContext *context;
262     PangoFontMap *fontmap;
263     PangoRenderer *renderer;
264    
265     context = pango_layout_get_context (layout);
266     fontmap = pango_context_get_font_map (context);
267     renderer = _pango_opengl_font_map_get_renderer (PANGO_OPENGL_FONT_MAP (fontmap));
268    
269     PANGO_OPENGL_RENDERER (renderer)->r = r;
270     PANGO_OPENGL_RENDERER (renderer)->g = g;
271     PANGO_OPENGL_RENDERER (renderer)->b = b;
272     PANGO_OPENGL_RENDERER (renderer)->a = a;
273 root 1.6 PANGO_OPENGL_RENDERER (renderer)->flags = flags;
274 root 1.1
275     pango_renderer_draw_layout (renderer, layout, x, y);
276     }
277    
278     void
279     pango_opengl_render_layout (PangoLayout *layout,
280     int x, int y,
281 root 1.6 float r, float g, float b, float a,
282     int flags)
283 root 1.1 {
284 root 1.6 pango_opengl_render_layout_subpixel (layout, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags);
285 root 1.1 }
286    
287     static void
288     pango_opengl_renderer_init (PangoOpenGLRenderer *renderer)
289     {
290 root 1.7 memset (&renderer->key, 0, sizeof (rc_key_t));
291    
292 root 1.1 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 *glrenderer = (PangoOpenGLRenderer *)renderer;
302     PangoColor *fg = 0;
303     GSList *l;
304 root 1.6 unsigned char r, g, b, a;
305 root 1.1
306     renderer->underline = PANGO_UNDERLINE_NONE;
307     renderer->strikethrough = FALSE;
308    
309 root 1.7 renderer->key.mode = GL_QUADS;
310     renderer->key.format = GL_T2F_V2F;
311     renderer->key.texname = 0;
312    
313 root 1.1 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 root 1.6 {
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 root 1.1 else
343 root 1.6 {
344     r = glrenderer->r * 255.f;
345     g = glrenderer->g * 255.f;
346     b = glrenderer->b * 255.f;
347     }
348    
349     a = glrenderer->a * 255.f;
350    
351     if (glrenderer->flags & FLAG_INVERSE)
352     {
353     r ^= 0xffU;
354     g ^= 0xffU;
355     b ^= 0xffU;
356     }
357    
358 root 1.7 renderer->key.r = r;
359     renderer->key.g = g;
360     renderer->key.b = b;
361     renderer->key.a = a;
362 root 1.1 }
363    
364     static void
365     draw_begin (PangoRenderer *renderer_)
366     {
367     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
368    
369     glEnable (GL_TEXTURE_2D);
370     glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
371     glEnable (GL_BLEND);
372     gl_BlendFuncSeparate (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
373     GL_ONE , GL_ONE_MINUS_SRC_ALPHA);
374     glEnable (GL_ALPHA_TEST);
375     glAlphaFunc (GL_GREATER, 0.01f);
376     }
377    
378     static void
379     draw_end (PangoRenderer *renderer_)
380     {
381     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
382    
383 root 1.7 rc_draw (renderer->rc);
384 root 1.1
385     glDisable (GL_ALPHA_TEST);
386     glDisable (GL_BLEND);
387     glDisable (GL_TEXTURE_2D);
388     }
389    
390     static void
391     pango_opengl_renderer_class_init (PangoOpenGLRendererClass *klass)
392     {
393     PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
394    
395     renderer_class->draw_glyph = draw_glyph;
396     renderer_class->draw_trapezoid = draw_trapezoid;
397     renderer_class->prepare_run = prepare_run;
398     renderer_class->begin = draw_begin;
399     renderer_class->end = draw_end;
400     }
401