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Revision: 1.13
Committed: Wed Dec 26 10:34:23 2007 UTC (16 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-0_9963
Changes since 1.12: +2 -3 lines
Log Message:
*** empty log message ***

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 root 1.1
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 root 1.2 g = _pango_opengl_font_get_cache_glyph_data (font, glyph);
179 root 1.1
180 root 1.3 if (!g || g->generation != tc_generation)
181 root 1.1 {
182     Glyph bm;
183     font_render_glyph (&bm, font, glyph);
184    
185 root 1.13 if (!g)
186 root 1.3 {
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 root 1.1
193 root 1.13 g->generation = tc_generation;
194 root 1.1 tc_get (&g->tex, bm.width, bm.height);
195    
196     g->left = bm.left;
197     g->top = bm.top;
198    
199     glBindTexture (GL_TEXTURE_2D, g->tex.name);
200     glPixelStorei (GL_UNPACK_ROW_LENGTH, bm.stride);
201     glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
202     glTexSubImage2D (GL_TEXTURE_2D, 0, g->tex.x, g->tex.y, bm.width, bm.height, GL_ALPHA, GL_UNSIGNED_BYTE, bm.bitmap);
203     glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
204     glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
205     }
206    
207     x += g->left;
208     y -= g->top;
209    
210 root 1.7 if (g->tex.name != renderer->key.texname)
211 root 1.1 {
212 root 1.7 renderer->key.texname = g->tex.name;
213     renderer->arr = rc_array (renderer->rc, &renderer->key);
214 root 1.1 }
215    
216 root 1.11 rc_glyph (renderer->arr, g->tex.x, g->tex.y, g->tex.w, g->tex.h, x, y);
217 root 1.1 }
218    
219     static void
220     draw_trapezoid (PangoRenderer *renderer_,
221     PangoRenderPart part,
222     double y1,
223     double x11,
224     double x21,
225     double y2,
226     double x12,
227     double x22)
228     {
229     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
230 root 1.7 rc_key_t key = renderer->key;
231     rc_array_t *arr;
232 root 1.1
233 root 1.7 key.mode = GL_QUADS;
234     key.format = GL_V2F;
235     key.texname = 0;
236    
237     arr = rc_array (renderer->rc, &key);
238    
239 root 1.8 rc_v2f (arr, x11, y1);
240     rc_v2f (arr, x21, y1);
241     rc_v2f (arr, x22, y2);
242     rc_v2f (arr, x12, y2);
243 root 1.1 }
244    
245     void
246     pango_opengl_render_layout_subpixel (PangoLayout *layout,
247 root 1.10 rc_t *rc,
248 root 1.1 int x, int y,
249 root 1.6 float r, float g, float b, float a,
250     int flags)
251 root 1.1 {
252     PangoContext *context;
253     PangoFontMap *fontmap;
254     PangoRenderer *renderer;
255 root 1.8 PangoOpenGLRenderer *gl;
256 root 1.1
257     context = pango_layout_get_context (layout);
258     fontmap = pango_context_get_font_map (context);
259     renderer = _pango_opengl_font_map_get_renderer (PANGO_OPENGL_FONT_MAP (fontmap));
260 root 1.8 gl = PANGO_OPENGL_RENDERER (renderer);
261 root 1.1
262 root 1.10 gl->rc = rc;
263 root 1.8 gl->r = r;
264     gl->g = g;
265     gl->b = b;
266     gl->a = a;
267     gl->flags = flags;
268 root 1.1
269     pango_renderer_draw_layout (renderer, layout, x, y);
270     }
271    
272     void
273     pango_opengl_render_layout (PangoLayout *layout,
274 root 1.10 rc_t *rc,
275 root 1.1 int x, int y,
276 root 1.6 float r, float g, float b, float a,
277     int flags)
278 root 1.1 {
279 root 1.10 pango_opengl_render_layout_subpixel (
280     layout, rc, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags
281     );
282 root 1.1 }
283    
284     static void
285     pango_opengl_renderer_init (PangoOpenGLRenderer *renderer)
286     {
287 root 1.7 memset (&renderer->key, 0, sizeof (rc_key_t));
288    
289 root 1.1 renderer->r = 1.;
290     renderer->g = 1.;
291     renderer->b = 1.;
292     renderer->a = 1.;
293     }
294    
295     static void
296     prepare_run (PangoRenderer *renderer, PangoLayoutRun *run)
297     {
298 root 1.9 PangoOpenGLRenderer *gl = (PangoOpenGLRenderer *)renderer;
299 root 1.1 PangoColor *fg = 0;
300     GSList *l;
301 root 1.6 unsigned char r, g, b, a;
302 root 1.1
303     renderer->underline = PANGO_UNDERLINE_NONE;
304     renderer->strikethrough = FALSE;
305    
306 root 1.9 gl->key.mode = GL_QUADS;
307 root 1.11 gl->key.format = 0; // glyphs
308 root 1.9 gl->key.texname = 0;
309 root 1.7
310 root 1.1 for (l = run->item->analysis.extra_attrs; l; l = l->next)
311     {
312     PangoAttribute *attr = l->data;
313    
314     switch (attr->klass->type)
315     {
316     case PANGO_ATTR_UNDERLINE:
317     renderer->underline = ((PangoAttrInt *)attr)->value;
318     break;
319    
320     case PANGO_ATTR_STRIKETHROUGH:
321     renderer->strikethrough = ((PangoAttrInt *)attr)->value;
322     break;
323    
324     case PANGO_ATTR_FOREGROUND:
325     fg = &((PangoAttrColor *)attr)->color;
326     break;
327    
328     default:
329     break;
330     }
331     }
332    
333     if (fg)
334 root 1.6 {
335     r = fg->red * (255.f / 65535.f);
336     g = fg->green * (255.f / 65535.f);
337     b = fg->blue * (255.f / 65535.f);
338     }
339 root 1.1 else
340 root 1.6 {
341 root 1.9 r = gl->r * 255.f;
342     g = gl->g * 255.f;
343     b = gl->b * 255.f;
344 root 1.6 }
345    
346 root 1.9 a = gl->a * 255.f;
347 root 1.6
348 root 1.9 if (gl->flags & FLAG_INVERSE)
349 root 1.6 {
350     r ^= 0xffU;
351     g ^= 0xffU;
352     b ^= 0xffU;
353     }
354    
355 root 1.9 gl->key.r = r;
356     gl->key.g = g;
357     gl->key.b = b;
358     gl->key.a = a;
359 root 1.1 }
360    
361     static void
362     draw_begin (PangoRenderer *renderer_)
363     {
364     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
365     }
366    
367     static void
368     draw_end (PangoRenderer *renderer_)
369     {
370     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
371     }
372    
373     static void
374     pango_opengl_renderer_class_init (PangoOpenGLRendererClass *klass)
375     {
376     PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
377    
378     renderer_class->draw_glyph = draw_glyph;
379     renderer_class->draw_trapezoid = draw_trapezoid;
380     renderer_class->prepare_run = prepare_run;
381     renderer_class->begin = draw_begin;
382     renderer_class->end = draw_end;
383     }
384