| 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 |
|
| 195 |
g->left = bm.left; |
| 196 |
g->top = bm.top; |
| 197 |
|
| 198 |
tc_get (&g->tex, bm.width, bm.height); |
| 199 |
|
| 200 |
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 |
} |
| 210 |
|
| 211 |
x += g->left; |
| 212 |
y -= g->top; |
| 213 |
|
| 214 |
if (g->tex.name != renderer->key.texname) |
| 215 |
{ |
| 216 |
renderer->key.texname = g->tex.name; |
| 217 |
renderer->arr = rc_array (renderer->rc, &renderer->key); |
| 218 |
} |
| 219 |
|
| 220 |
rc_glyph (renderer->arr, g->tex.x, g->tex.y, g->tex.w, g->tex.h, x, y); |
| 221 |
} |
| 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 |
rc_key_t key = renderer->key; |
| 235 |
rc_array_t *arr; |
| 236 |
|
| 237 |
key.mode = GL_QUADS; |
| 238 |
key.format = GL_V2F; |
| 239 |
key.texname = 0; |
| 240 |
|
| 241 |
arr = rc_array (renderer->rc, &key); |
| 242 |
|
| 243 |
rc_v2f (arr, x11, y1); |
| 244 |
rc_v2f (arr, x21, y1); |
| 245 |
rc_v2f (arr, x22, y2); |
| 246 |
rc_v2f (arr, x12, y2); |
| 247 |
} |
| 248 |
|
| 249 |
void |
| 250 |
pango_opengl_render_layout_subpixel (PangoLayout *layout, |
| 251 |
rc_t *rc, |
| 252 |
int x, int y, |
| 253 |
float r, float g, float b, float a, |
| 254 |
int flags) |
| 255 |
{ |
| 256 |
PangoContext *context; |
| 257 |
PangoFontMap *fontmap; |
| 258 |
PangoRenderer *renderer; |
| 259 |
PangoOpenGLRenderer *gl; |
| 260 |
|
| 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 |
gl = PANGO_OPENGL_RENDERER (renderer); |
| 265 |
|
| 266 |
gl->rc = rc; |
| 267 |
gl->r = r; |
| 268 |
gl->g = g; |
| 269 |
gl->b = b; |
| 270 |
gl->a = a; |
| 271 |
gl->flags = flags; |
| 272 |
|
| 273 |
pango_renderer_draw_layout (renderer, layout, x, y); |
| 274 |
} |
| 275 |
|
| 276 |
void |
| 277 |
pango_opengl_render_layout (PangoLayout *layout, |
| 278 |
rc_t *rc, |
| 279 |
int x, int y, |
| 280 |
float r, float g, float b, float a, |
| 281 |
int flags) |
| 282 |
{ |
| 283 |
pango_opengl_render_layout_subpixel ( |
| 284 |
layout, rc, x * PANGO_SCALE, y * PANGO_SCALE, r, g, b, a, flags |
| 285 |
); |
| 286 |
} |
| 287 |
|
| 288 |
static void |
| 289 |
pango_opengl_renderer_init (PangoOpenGLRenderer *renderer) |
| 290 |
{ |
| 291 |
memset (&renderer->key, 0, sizeof (rc_key_t)); |
| 292 |
|
| 293 |
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 |
PangoOpenGLRenderer *gl = (PangoOpenGLRenderer *)renderer; |
| 303 |
PangoColor *fg = 0; |
| 304 |
GSList *l; |
| 305 |
unsigned char r, g, b, a; |
| 306 |
|
| 307 |
renderer->underline = PANGO_UNDERLINE_NONE; |
| 308 |
renderer->strikethrough = FALSE; |
| 309 |
|
| 310 |
gl->key.mode = GL_QUADS; |
| 311 |
gl->key.format = 0; // glyphs |
| 312 |
gl->key.texname = 0; |
| 313 |
|
| 314 |
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 |
{ |
| 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 |
else |
| 344 |
{ |
| 345 |
r = gl->r * 255.f; |
| 346 |
g = gl->g * 255.f; |
| 347 |
b = gl->b * 255.f; |
| 348 |
} |
| 349 |
|
| 350 |
a = gl->a * 255.f; |
| 351 |
|
| 352 |
if (gl->flags & FLAG_INVERSE) |
| 353 |
{ |
| 354 |
r ^= 0xffU; |
| 355 |
g ^= 0xffU; |
| 356 |
b ^= 0xffU; |
| 357 |
} |
| 358 |
|
| 359 |
gl->key.r = r; |
| 360 |
gl->key.g = g; |
| 361 |
gl->key.b = b; |
| 362 |
gl->key.a = a; |
| 363 |
} |
| 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 |
|
