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/cvs/cf.schmorp.de/Deliantra-Client/pango-render.c
Revision: 1.15
Committed: Sun Jan 13 08:31:45 2008 UTC (16 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-2_03, rel-2_02, rel-0_9965, rel-0_9964, rel-2_05, rel-2_04, rel-0_9968, rel-2_0, rel-0_9972, rel-0_9973, rel-0_9974, rel-0_9975, rel-0_9976, rel-0_9977, rel-0_9978, rel-0_9971, rel-0_9967, rel-1_21, rel-0_9966
Changes since 1.14: +3 -2 lines
Log Message:
better fix

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
195     g->left = bm.left;
196     g->top = bm.top;
197    
198 root 1.15 tc_get (&g->tex, bm.width, bm.height);
199    
200 root 1.14 if (bm.width && bm.height)
201     {
202     glBindTexture (GL_TEXTURE_2D, g->tex.name);
203     glPixelStorei (GL_UNPACK_ROW_LENGTH, bm.stride);
204     glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
205     glTexSubImage2D (GL_TEXTURE_2D, 0, g->tex.x, g->tex.y, bm.width, bm.height, GL_ALPHA, GL_UNSIGNED_BYTE, bm.bitmap);
206     glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
207     glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
208     }
209 root 1.1 }
210    
211     x += g->left;
212     y -= g->top;
213    
214 root 1.7 if (g->tex.name != renderer->key.texname)
215 root 1.1 {
216 root 1.7 renderer->key.texname = g->tex.name;
217     renderer->arr = rc_array (renderer->rc, &renderer->key);
218 root 1.1 }
219    
220 root 1.11 rc_glyph (renderer->arr, g->tex.x, g->tex.y, g->tex.w, g->tex.h, x, y);
221 root 1.1 }
222    
223     static void
224     draw_trapezoid (PangoRenderer *renderer_,
225     PangoRenderPart part,
226     double y1,
227     double x11,
228     double x21,
229     double y2,
230     double x12,
231     double x22)
232     {
233     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
234 root 1.7 rc_key_t key = renderer->key;
235     rc_array_t *arr;
236 root 1.1
237 root 1.7 key.mode = GL_QUADS;
238     key.format = GL_V2F;
239     key.texname = 0;
240    
241     arr = rc_array (renderer->rc, &key);
242    
243 root 1.8 rc_v2f (arr, x11, y1);
244     rc_v2f (arr, x21, y1);
245     rc_v2f (arr, x22, y2);
246     rc_v2f (arr, x12, y2);
247 root 1.1 }
248    
249     void
250     pango_opengl_render_layout_subpixel (PangoLayout *layout,
251 root 1.10 rc_t *rc,
252 root 1.1 int x, int y,
253 root 1.6 float r, float g, float b, float a,
254     int flags)
255 root 1.1 {
256     PangoContext *context;
257     PangoFontMap *fontmap;
258     PangoRenderer *renderer;
259 root 1.8 PangoOpenGLRenderer *gl;
260 root 1.1
261     context = pango_layout_get_context (layout);
262     fontmap = pango_context_get_font_map (context);
263     renderer = _pango_opengl_font_map_get_renderer (PANGO_OPENGL_FONT_MAP (fontmap));
264 root 1.8 gl = PANGO_OPENGL_RENDERER (renderer);
265 root 1.1
266 root 1.10 gl->rc = rc;
267 root 1.8 gl->r = r;
268     gl->g = g;
269     gl->b = b;
270     gl->a = a;
271     gl->flags = flags;
272 root 1.1
273     pango_renderer_draw_layout (renderer, layout, x, y);
274     }
275    
276     void
277     pango_opengl_render_layout (PangoLayout *layout,
278 root 1.10 rc_t *rc,
279 root 1.1 int x, int y,
280 root 1.6 float r, float g, float b, float a,
281     int flags)
282 root 1.1 {
283 root 1.10 pango_opengl_render_layout_subpixel (
284 root 1.15 layout, rc, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags
285 root 1.10 );
286 root 1.1 }
287    
288     static void
289     pango_opengl_renderer_init (PangoOpenGLRenderer *renderer)
290     {
291 root 1.7 memset (&renderer->key, 0, sizeof (rc_key_t));
292    
293 root 1.1 renderer->r = 1.;
294     renderer->g = 1.;
295     renderer->b = 1.;
296     renderer->a = 1.;
297     }
298    
299     static void
300     prepare_run (PangoRenderer *renderer, PangoLayoutRun *run)
301     {
302 root 1.9 PangoOpenGLRenderer *gl = (PangoOpenGLRenderer *)renderer;
303 root 1.1 PangoColor *fg = 0;
304     GSList *l;
305 root 1.6 unsigned char r, g, b, a;
306 root 1.1
307     renderer->underline = PANGO_UNDERLINE_NONE;
308     renderer->strikethrough = FALSE;
309    
310 root 1.9 gl->key.mode = GL_QUADS;
311 root 1.11 gl->key.format = 0; // glyphs
312 root 1.9 gl->key.texname = 0;
313 root 1.7
314 root 1.1 for (l = run->item->analysis.extra_attrs; l; l = l->next)
315     {
316     PangoAttribute *attr = l->data;
317    
318     switch (attr->klass->type)
319     {
320     case PANGO_ATTR_UNDERLINE:
321     renderer->underline = ((PangoAttrInt *)attr)->value;
322     break;
323    
324     case PANGO_ATTR_STRIKETHROUGH:
325     renderer->strikethrough = ((PangoAttrInt *)attr)->value;
326     break;
327    
328     case PANGO_ATTR_FOREGROUND:
329     fg = &((PangoAttrColor *)attr)->color;
330     break;
331    
332     default:
333     break;
334     }
335     }
336    
337     if (fg)
338 root 1.6 {
339     r = fg->red * (255.f / 65535.f);
340     g = fg->green * (255.f / 65535.f);
341     b = fg->blue * (255.f / 65535.f);
342     }
343 root 1.1 else
344 root 1.6 {
345 root 1.9 r = gl->r * 255.f;
346     g = gl->g * 255.f;
347     b = gl->b * 255.f;
348 root 1.6 }
349    
350 root 1.9 a = gl->a * 255.f;
351 root 1.6
352 root 1.9 if (gl->flags & FLAG_INVERSE)
353 root 1.6 {
354     r ^= 0xffU;
355     g ^= 0xffU;
356     b ^= 0xffU;
357     }
358    
359 root 1.9 gl->key.r = r;
360     gl->key.g = g;
361     gl->key.b = b;
362     gl->key.a = a;
363 root 1.1 }
364    
365     static void
366     draw_begin (PangoRenderer *renderer_)
367     {
368     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
369     }
370    
371     static void
372     draw_end (PangoRenderer *renderer_)
373     {
374     PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
375     }
376    
377     static void
378     pango_opengl_renderer_class_init (PangoOpenGLRendererClass *klass)
379     {
380     PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
381    
382     renderer_class->draw_glyph = draw_glyph;
383     renderer_class->draw_trapezoid = draw_trapezoid;
384     renderer_class->prepare_run = prepare_run;
385     renderer_class->begin = draw_begin;
386     renderer_class->end = draw_end;
387     }
388