deliantra/Deliantra-Client/pango-render.c

/* Pango
 * Rendering routines to OpenGL
 *
 * Copyright (C) 2006 Marc Lehmann <pcg@goof.com>
 * Copyright (C) 2004 Red Hat Software
 * Copyright (C) 2000 Tor Lillqvist
 *
 * This file is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This file is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <math.h>

#include "pangoopengl.h"

#define PANGO_OPENGL_RENDERER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_OPENGL_RENDERER, PangoOpenGLRendererClass))
#define PANGO_IS_OPENGL_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_OPENGL_RENDERER))
#define PANGO_OPENGL_RENDERER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_OPENGL_RENDERER, PangoOpenGLRendererClass))

typedef struct {
  PangoRendererClass parent_class;
} PangoOpenGLRendererClass;

struct _PangoOpenGLRenderer
{
  PangoRenderer parent_instance;
  float r, g, b, a; // modulate
  int flags;
  rc_t *rc; // rendercache
  rc_key_t key; // current render key
  rc_array_t *arr;
};

G_DEFINE_TYPE (PangoOpenGLRenderer, pango_opengl_renderer, PANGO_TYPE_RENDERER)

typedef struct
{
  uint8_t *bitmap;
  int width, stride, height, top, left;
} Glyph;

static void *
temp_buffer (size_t size)
{
  static char *buffer;
  static size_t alloc;

  if (size > alloc)
    {
      size = (size + 4095) & ~4095;
      free (buffer);
      alloc = size;
      buffer = malloc (size);
    }

  return buffer;
}

static void
render_box (Glyph *glyph, int width, int height, int top)
{
  int i;
  int left = 0;

  if (height > 2)
    {
      height -= 2;
      top++;
    }

  if (width > 2)
    {
      width -= 2;
      left++;
    }

  glyph->stride = (width + 3) & ~3;
  glyph->width  = width;
  glyph->height = height;
  glyph->top    = top;
  glyph->left   = left;

  glyph->bitmap = temp_buffer (width * height);
  memset (glyph->bitmap, 0, glyph->stride * height);

  for (i = width; i--; )
    glyph->bitmap [i] = glyph->bitmap [i + (height - 1) * glyph->stride] = 0xff;

  for (i = height; i--; )
    glyph->bitmap [i * glyph->stride] = glyph->bitmap [i * glyph->stride + (width - 1)] = 0xff;
}

static void
font_render_glyph (Glyph *glyph, PangoFont *font, int glyph_index)
{
  FT_Face face;

  if (glyph_index & PANGO_GLYPH_UNKNOWN_FLAG)
    {
      PangoFontMetrics *metrics;

      if (!font)
        goto generic_box;

      metrics = pango_font_get_metrics (font, NULL);
      if (!metrics)
        goto generic_box;

      render_box (glyph, PANGO_PIXELS (metrics->approximate_char_width),
                         PANGO_PIXELS (metrics->ascent + metrics->descent),
                         PANGO_PIXELS (metrics->ascent));

      pango_font_metrics_unref (metrics);

      return;
    }

  face = pango_opengl_font_get_face (font);
  
  if (face)
    {
      PangoOpenGLFont *glfont = (PangoOpenGLFont *)font;

      FT_Load_Glyph (face, glyph_index, glfont->load_flags);
      FT_Render_Glyph (face->glyph, ft_render_mode_normal);

      glyph->width  = face->glyph->bitmap.width;
      glyph->stride = face->glyph->bitmap.pitch;
      glyph->height = face->glyph->bitmap.rows;
      glyph->top    = face->glyph->bitmap_top;
      glyph->left   = face->glyph->bitmap_left;
      glyph->bitmap = face->glyph->bitmap.buffer;
    }
  else
    generic_box:
      render_box (glyph, PANGO_UNKNOWN_GLYPH_WIDTH, PANGO_UNKNOWN_GLYPH_HEIGHT, PANGO_UNKNOWN_GLYPH_HEIGHT);
}

typedef struct glyph_info {
  tc_area tex;
  int left, top;
  int generation;
} glyph_info;

static void
free_glyph_info (glyph_info *g)
{
  tc_put (&g->tex);
  g_slice_free (glyph_info, g);
}

static void
draw_glyph (PangoRenderer *renderer_, PangoFont *font, PangoGlyph glyph, double x, double y)
{
  PangoOpenGLRenderer *renderer = PANGO_OPENGL_RENDERER (renderer_);
  glyph_info *g;
  float x1, y1, x2, y2;

  if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
    {
      glyph = pango_opengl_get_unknown_glyph (font);

      if (glyph == PANGO_GLYPH_EMPTY)
        glyph = PANGO_GLYPH_UNKNOWN_FLAG;
    }

  g = _pango_opengl_font_get_cache_glyph_data (font, glyph);

  if (!g || g->generation != tc_generation)
    {
      Glyph bm;
      font_render_glyph (&bm, font, glyph);

      if (g)
        g->generation = tc_generation;
      else
        {
          g = g_slice_new (glyph_info);

          _pango_opengl_font_set_glyph_cache_destroy (font, (GDestroyNotify)free_glyph_info);
          _pango_opengl_font_set_cache_glyph_data (font, glyph, g);
        }

      tc_get (&g->tex, bm.width, bm.height);

      g->left = bm.left;
      g->top  = bm.top;

      glBindTexture (GL_TEXTURE_2D, g->tex.name);
      glPixelStorei (GL_UNPACK_ROW_LENGTH, bm.stride);
      glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
      glTexSubImage2D (GL_TEXTURE_2D, 0, g->tex.x, g->tex.y, bm.width, bm.height, GL_ALPHA, GL_UNSIGNED_BYTE, bm.bitmap);
      glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
      glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
    }

  x += g->left;
  y -= g->top;

  if (g->tex.name != renderer->key.texname)
    {
      renderer->key.texname = g->tex.name;
      renderer->arr = rc_array (renderer->rc, &renderer->key);
    }

  rc_glyph (renderer->arr, g->tex.x, g->tex.y, g->tex.w, g->tex.h, x, y);
}

static void
draw_trapezoid (PangoRenderer   *renderer_,
                PangoRenderPart  part,
                double           y1,
                double           x11,
                double           x21,
                double           y2,
                double           x12,
                double           x22)
{
  PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
  rc_key_t key = renderer->key;
  rc_array_t *arr;

  key.mode    = GL_QUADS;
  key.format  = GL_V2F;
  key.texname = 0;

  arr = rc_array (renderer->rc, &key);

  rc_v2f (arr, x11, y1);
  rc_v2f (arr, x21, y1);
  rc_v2f (arr, x22, y2);
  rc_v2f (arr, x12, y2);
}

void 
pango_opengl_render_layout_subpixel (PangoLayout *layout,
                                     rc_t *rc,
                                     int x, int y,
                                     float r, float g, float b, float a,
                                     int flags)
{
  PangoContext *context;
  PangoFontMap *fontmap;
  PangoRenderer *renderer;
  PangoOpenGLRenderer *gl;

  context = pango_layout_get_context (layout);
  fontmap = pango_context_get_font_map (context);
  renderer = _pango_opengl_font_map_get_renderer (PANGO_OPENGL_FONT_MAP (fontmap));
  gl = PANGO_OPENGL_RENDERER (renderer);

  gl->rc = rc;
  gl->r = r;
  gl->g = g;
  gl->b = b;
  gl->a = a;
  gl->flags = flags;
  
  pango_renderer_draw_layout (renderer, layout, x, y);
}

void 
pango_opengl_render_layout (PangoLayout *layout,
                            rc_t *rc,
                            int x, int y,
                            float r, float g, float b, float a,
                            int flags)
{
  pango_opengl_render_layout_subpixel (
     layout, rc, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags
  );
}

static void
pango_opengl_renderer_init (PangoOpenGLRenderer *renderer)
{
  memset (&renderer->key, 0, sizeof (rc_key_t));

  renderer->r = 1.;
  renderer->g = 1.;
  renderer->b = 1.;
  renderer->a = 1.;
}

static void
prepare_run (PangoRenderer *renderer, PangoLayoutRun *run)
{
  PangoOpenGLRenderer *gl = (PangoOpenGLRenderer *)renderer;
  PangoColor *fg = 0;
  GSList *l;
  unsigned char r, g, b, a;

  renderer->underline = PANGO_UNDERLINE_NONE;
  renderer->strikethrough = FALSE;

  gl->key.mode    = GL_QUADS;
  gl->key.format  = 0; // glyphs
  gl->key.texname = 0;

  for (l = run->item->analysis.extra_attrs; l; l = l->next)
    {
      PangoAttribute *attr = l->data;
      
      switch (attr->klass->type)
        {
        case PANGO_ATTR_UNDERLINE:
          renderer->underline = ((PangoAttrInt *)attr)->value;
          break;
          
        case PANGO_ATTR_STRIKETHROUGH:
          renderer->strikethrough = ((PangoAttrInt *)attr)->value;
          break;
          
        case PANGO_ATTR_FOREGROUND:
          fg = &((PangoAttrColor *)attr)->color;
          break;
          
        default:
          break;
        }
    }

  if (fg)
    {
      r = fg->red   * (255.f / 65535.f);
      g = fg->green * (255.f / 65535.f);
      b = fg->blue  * (255.f / 65535.f);
    }
  else 
    {
      r = gl->r * 255.f;
      g = gl->g * 255.f;
      b = gl->b * 255.f;
    }

  a = gl->a * 255.f;

  if (gl->flags & FLAG_INVERSE)
    {
      r ^= 0xffU;
      g ^= 0xffU;
      b ^= 0xffU;
    } 

  gl->key.r = r;
  gl->key.g = g;
  gl->key.b = b;
  gl->key.a = a;
}

static void
draw_begin (PangoRenderer *renderer_)
{
  PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
}

static void
draw_end (PangoRenderer *renderer_)
{
  PangoOpenGLRenderer *renderer = (PangoOpenGLRenderer *)renderer_;
}

static void
pango_opengl_renderer_class_init (PangoOpenGLRendererClass *klass)
{
  PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);

  renderer_class->draw_glyph     = draw_glyph;
  renderer_class->draw_trapezoid = draw_trapezoid;
  renderer_class->prepare_run    = prepare_run;
  renderer_class->begin          = draw_begin;
  renderer_class->end            = draw_end;
}

Revision:	1.11
Committed:	Sun Aug 12 08:44:22 2007 UTC (16 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.10:	+2 -10 lines
Log Message:	use an compressed format for glyph quad vectors. this reduces the size of e.g. the opengl info from 200k to 20k, and typical sizes for labels are now <<100 bytes. the cost is full immediate mode submission of coordinates (cpu), but glInterleavedArrays is likely not much faster and modern cpus probably prefer more decoding over more cache misses.
#	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	1.7	if (g->tex.name != renderer->key.texname)
213	root	1.1	{
214	root	1.7	renderer->key.texname = g->tex.name;
215			renderer->arr = rc_array (renderer->rc, &renderer->key);
216	root	1.1	}
217
218	root	1.11	rc_glyph (renderer->arr, g->tex.x, g->tex.y, g->tex.w, g->tex.h, x, y);
219	root	1.1	}
220
221			static void
222			draw_trapezoid (PangoRenderer *renderer_,
223			PangoRenderPart part,
224			double y1,
225			double x11,
226			double x21,
227			double y2,
228			double x12,
229			double x22)
230			{
231			PangoOpenGLRenderer renderer = (PangoOpenGLRenderer )renderer_;
232	root	1.7	rc_key_t key = renderer->key;
233			rc_array_t *arr;
234	root	1.1
235	root	1.7	key.mode = GL_QUADS;
236			key.format = GL_V2F;
237			key.texname = 0;
238
239			arr = rc_array (renderer->rc, &key);
240
241	root	1.8	rc_v2f (arr, x11, y1);
242			rc_v2f (arr, x21, y1);
243			rc_v2f (arr, x22, y2);
244			rc_v2f (arr, x12, y2);
245	root	1.1	}
246
247			void
248			pango_opengl_render_layout_subpixel (PangoLayout *layout,
249	root	1.10	rc_t *rc,
250	root	1.1	int x, int y,
251	root	1.6	float r, float g, float b, float a,
252			int flags)
253	root	1.1	{
254			PangoContext *context;
255			PangoFontMap *fontmap;
256			PangoRenderer *renderer;
257	root	1.8	PangoOpenGLRenderer *gl;
258	root	1.1
259			context = pango_layout_get_context (layout);
260			fontmap = pango_context_get_font_map (context);
261			renderer = _pango_opengl_font_map_get_renderer (PANGO_OPENGL_FONT_MAP (fontmap));
262	root	1.8	gl = PANGO_OPENGL_RENDERER (renderer);
263	root	1.1
264	root	1.10	gl->rc = rc;
265	root	1.8	gl->r = r;
266			gl->g = g;
267			gl->b = b;
268			gl->a = a;
269			gl->flags = flags;
270	root	1.1
271			pango_renderer_draw_layout (renderer, layout, x, y);
272			}
273
274			void
275			pango_opengl_render_layout (PangoLayout *layout,
276	root	1.10	rc_t *rc,
277	root	1.1	int x, int y,
278	root	1.6	float r, float g, float b, float a,
279			int flags)
280	root	1.1	{
281	root	1.10	pango_opengl_render_layout_subpixel (
282			layout, rc, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags
283			);
284	root	1.1	}
285
286			static void
287			pango_opengl_renderer_init (PangoOpenGLRenderer *renderer)
288			{
289	root	1.7	memset (&renderer->key, 0, sizeof (rc_key_t));
290
291	root	1.1	renderer->r = 1.;
292			renderer->g = 1.;
293			renderer->b = 1.;
294			renderer->a = 1.;
295			}
296
297			static void
298			prepare_run (PangoRenderer renderer, PangoLayoutRun run)
299			{
300	root	1.9	PangoOpenGLRenderer gl = (PangoOpenGLRenderer )renderer;
301	root	1.1	PangoColor *fg = 0;
302			GSList *l;
303	root	1.6	unsigned char r, g, b, a;
304	root	1.1
305			renderer->underline = PANGO_UNDERLINE_NONE;
306			renderer->strikethrough = FALSE;
307
308	root	1.9	gl->key.mode = GL_QUADS;
309	root	1.11	gl->key.format = 0; // glyphs
310	root	1.9	gl->key.texname = 0;
311	root	1.7
312	root	1.1	for (l = run->item->analysis.extra_attrs; l; l = l->next)
313			{
314			PangoAttribute *attr = l->data;
315
316			switch (attr->klass->type)
317			{
318			case PANGO_ATTR_UNDERLINE:
319			renderer->underline = ((PangoAttrInt *)attr)->value;
320			break;
321
322			case PANGO_ATTR_STRIKETHROUGH:
323			renderer->strikethrough = ((PangoAttrInt *)attr)->value;
324			break;
325
326			case PANGO_ATTR_FOREGROUND:
327			fg = &((PangoAttrColor *)attr)->color;
328			break;
329
330			default:
331			break;
332			}
333			}
334
335			if (fg)
336	root	1.6	{
337			r = fg->red * (255.f / 65535.f);
338			g = fg->green * (255.f / 65535.f);
339			b = fg->blue * (255.f / 65535.f);
340			}
341	root	1.1	else
342	root	1.6	{
343	root	1.9	r = gl->r * 255.f;
344			g = gl->g * 255.f;
345			b = gl->b * 255.f;
346	root	1.6	}
347
348	root	1.9	a = gl->a * 255.f;
349	root	1.6
350	root	1.9	if (gl->flags & FLAG_INVERSE)
351	root	1.6	{
352			r ^= 0xffU;
353			g ^= 0xffU;
354			b ^= 0xffU;
355			}
356
357	root	1.9	gl->key.r = r;
358			gl->key.g = g;
359			gl->key.b = b;
360			gl->key.a = a;
361	root	1.1	}
362
363			static void
364			draw_begin (PangoRenderer *renderer_)
365			{
366			PangoOpenGLRenderer renderer = (PangoOpenGLRenderer )renderer_;
367			}
368
369			static void
370			draw_end (PangoRenderer *renderer_)
371			{
372			PangoOpenGLRenderer renderer = (PangoOpenGLRenderer )renderer_;
373			}
374
375			static void
376			pango_opengl_renderer_class_init (PangoOpenGLRendererClass *klass)
377			{
378			PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
379
380			renderer_class->draw_glyph = draw_glyph;
381			renderer_class->draw_trapezoid = draw_trapezoid;
382			renderer_class->prepare_run = prepare_run;
383			renderer_class->begin = draw_begin;
384			renderer_class->end = draw_end;
385			}
386