1 | /* vim: set sw=4: -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ |
---|
2 | /* |
---|
3 | rsvg-file-util.c: SAX-based renderer for SVG files into a GdkPixbuf. |
---|
4 | |
---|
5 | Copyright (C) 2000 Eazel, Inc. |
---|
6 | Copyright (C) 2002 Dom Lachowicz <cinamod@hotmail.com> |
---|
7 | |
---|
8 | This program is free software; you can redistribute it and/or |
---|
9 | modify it under the terms of the GNU Library General Public License as |
---|
10 | published by the Free Software Foundation; either version 2 of the |
---|
11 | License, or (at your option) any later version. |
---|
12 | |
---|
13 | This program 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 program; if not, write to the |
---|
20 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
---|
21 | Boston, MA 02111-1307, USA. |
---|
22 | |
---|
23 | Author: Raph Levien <raph@artofcode.com> |
---|
24 | */ |
---|
25 | |
---|
26 | #include "config.h" |
---|
27 | #include "rsvg.h" |
---|
28 | |
---|
29 | #if HAVE_SVGZ |
---|
30 | #include "rsvg-gz.h" |
---|
31 | #endif |
---|
32 | |
---|
33 | #include <stdio.h> |
---|
34 | #include <stdlib.h> |
---|
35 | #include <math.h> |
---|
36 | |
---|
37 | #define SVG_BUFFER_SIZE (1024 * 8) |
---|
38 | |
---|
39 | typedef enum { |
---|
40 | RSVG_SIZE_ZOOM, |
---|
41 | RSVG_SIZE_WH, |
---|
42 | RSVG_SIZE_WH_MAX, |
---|
43 | RSVG_SIZE_ZOOM_MAX |
---|
44 | } RsvgSizeType; |
---|
45 | |
---|
46 | struct RsvgSizeCallbackData |
---|
47 | { |
---|
48 | RsvgSizeType type; |
---|
49 | double x_zoom; |
---|
50 | double y_zoom; |
---|
51 | gint width; |
---|
52 | gint height; |
---|
53 | }; |
---|
54 | |
---|
55 | static void |
---|
56 | rsvg_size_callback (int *width, |
---|
57 | int *height, |
---|
58 | gpointer data) |
---|
59 | { |
---|
60 | struct RsvgSizeCallbackData *real_data = (struct RsvgSizeCallbackData *) data; |
---|
61 | double zoomx, zoomy, zoom; |
---|
62 | |
---|
63 | switch (real_data->type) { |
---|
64 | case RSVG_SIZE_ZOOM: |
---|
65 | if (*width < 0 || *height < 0) |
---|
66 | return; |
---|
67 | |
---|
68 | *width = floor (real_data->x_zoom * *width + 0.5); |
---|
69 | *height = floor (real_data->y_zoom * *height + 0.5); |
---|
70 | return; |
---|
71 | |
---|
72 | case RSVG_SIZE_ZOOM_MAX: |
---|
73 | if (*width < 0 || *height < 0) |
---|
74 | return; |
---|
75 | |
---|
76 | *width = floor (real_data->x_zoom * *width + 0.5); |
---|
77 | *height = floor (real_data->y_zoom * *height + 0.5); |
---|
78 | |
---|
79 | if (*width > real_data->width || *height > real_data->height) |
---|
80 | { |
---|
81 | zoomx = (double) real_data->width / *width; |
---|
82 | zoomy = (double) real_data->height / *height; |
---|
83 | zoom = MIN (zoomx, zoomy); |
---|
84 | |
---|
85 | *width = floor (zoom * *width + 0.5); |
---|
86 | *height = floor (zoom * *height + 0.5); |
---|
87 | } |
---|
88 | return; |
---|
89 | |
---|
90 | case RSVG_SIZE_WH_MAX: |
---|
91 | if (*width < 0 || *height < 0) |
---|
92 | return; |
---|
93 | |
---|
94 | zoomx = (double) real_data->width / *width; |
---|
95 | zoomy = (double) real_data->height / *height; |
---|
96 | zoom = MIN (zoomx, zoomy); |
---|
97 | |
---|
98 | *width = floor (zoom * *width + 0.5); |
---|
99 | *height = floor (zoom * *height + 0.5); |
---|
100 | return; |
---|
101 | |
---|
102 | case RSVG_SIZE_WH: |
---|
103 | |
---|
104 | if (real_data->width != -1) |
---|
105 | *width = real_data->width; |
---|
106 | if (real_data->height != -1) |
---|
107 | *height = real_data->height; |
---|
108 | return; |
---|
109 | } |
---|
110 | |
---|
111 | g_assert_not_reached (); |
---|
112 | } |
---|
113 | |
---|
114 | static GdkPixbuf * |
---|
115 | rsvg_pixbuf_from_file_with_size_data_ex (RsvgHandle * handle, |
---|
116 | const gchar * file_name, |
---|
117 | struct RsvgSizeCallbackData * data, |
---|
118 | GError ** error) |
---|
119 | { |
---|
120 | guchar chars[SVG_BUFFER_SIZE]; |
---|
121 | GdkPixbuf *retval; |
---|
122 | gint result; |
---|
123 | FILE *f = fopen (file_name, "rb"); |
---|
124 | |
---|
125 | if (!f) |
---|
126 | { |
---|
127 | /* FIXME: Set up error. */ |
---|
128 | return NULL; |
---|
129 | } |
---|
130 | |
---|
131 | rsvg_handle_set_size_callback (handle, rsvg_size_callback, data, NULL); |
---|
132 | |
---|
133 | while ((result = fread (chars, 1, SVG_BUFFER_SIZE, f)) > 0) |
---|
134 | rsvg_handle_write (handle, chars, result, error); |
---|
135 | |
---|
136 | rsvg_handle_close (handle, error); |
---|
137 | retval = rsvg_handle_get_pixbuf (handle); |
---|
138 | |
---|
139 | fclose (f); |
---|
140 | return retval; |
---|
141 | } |
---|
142 | |
---|
143 | static GdkPixbuf * |
---|
144 | rsvg_pixbuf_from_file_with_size_data (const gchar * file_name, |
---|
145 | struct RsvgSizeCallbackData * data, |
---|
146 | GError ** error) |
---|
147 | { |
---|
148 | #if HAVE_SVGZ |
---|
149 | RsvgHandle * handle; |
---|
150 | guchar chars[SVG_BUFFER_SIZE]; |
---|
151 | GdkPixbuf *retval; |
---|
152 | gint result; |
---|
153 | FILE *f = fopen (file_name, "rb"); |
---|
154 | |
---|
155 | if (!f) |
---|
156 | { |
---|
157 | /* FIXME: Set up error. */ |
---|
158 | return NULL; |
---|
159 | } |
---|
160 | |
---|
161 | result = fread (chars, 1, SVG_BUFFER_SIZE, f); |
---|
162 | |
---|
163 | if (result == 0) { |
---|
164 | fclose (f); |
---|
165 | return NULL; |
---|
166 | } |
---|
167 | |
---|
168 | /* test for GZ marker */ |
---|
169 | if ((result >= 2) && (chars[0] == (guchar)0x1f) && (chars[1] == (guchar)0x8b)) |
---|
170 | handle = rsvg_handle_new_gz (); |
---|
171 | else |
---|
172 | handle = rsvg_handle_new (); |
---|
173 | |
---|
174 | rsvg_handle_set_size_callback (handle, rsvg_size_callback, data, NULL); |
---|
175 | rsvg_handle_write (handle, chars, result, error); |
---|
176 | |
---|
177 | while ((result = fread (chars, 1, SVG_BUFFER_SIZE, f)) > 0) |
---|
178 | rsvg_handle_write (handle, chars, result, error); |
---|
179 | |
---|
180 | rsvg_handle_close (handle, error); |
---|
181 | retval = rsvg_handle_get_pixbuf (handle); |
---|
182 | |
---|
183 | fclose (f); |
---|
184 | rsvg_handle_free (handle); |
---|
185 | return retval; |
---|
186 | #else |
---|
187 | RsvgHandle * handle = rsvg_handle_new (); |
---|
188 | GdkPixbuf * retval = rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, data, error); |
---|
189 | rsvg_handle_free (handle); |
---|
190 | return retval; |
---|
191 | #endif |
---|
192 | } |
---|
193 | |
---|
194 | |
---|
195 | /** |
---|
196 | * rsvg_pixbuf_from_file_at_size_ex: |
---|
197 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
---|
198 | * @file_name: A file name |
---|
199 | * @width: The new width, or -1 |
---|
200 | * @height: The new height, or -1 |
---|
201 | * @error: return location for errors |
---|
202 | * |
---|
203 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
---|
204 | * from the size indicated to the new size indicated by @width and @height. If |
---|
205 | * either of these are -1, then the default size of the image being loaded is |
---|
206 | * used. The caller must assume the reference to the returned pixbuf. If an |
---|
207 | * error occurred, @error is set and %NULL is returned. Returned handle is closed |
---|
208 | * by this call and must be freed by the caller. |
---|
209 | * |
---|
210 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
211 | **/ |
---|
212 | GdkPixbuf * |
---|
213 | rsvg_pixbuf_from_file_at_size_ex (RsvgHandle * handle, |
---|
214 | const gchar *file_name, |
---|
215 | gint width, |
---|
216 | gint height, |
---|
217 | GError **error) |
---|
218 | { |
---|
219 | struct RsvgSizeCallbackData data; |
---|
220 | |
---|
221 | data.type = RSVG_SIZE_WH; |
---|
222 | data.width = width; |
---|
223 | data.height = height; |
---|
224 | |
---|
225 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
---|
226 | } |
---|
227 | |
---|
228 | /** |
---|
229 | * rsvg_pixbuf_from_file_ex: |
---|
230 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
---|
231 | * @file_name: A file name |
---|
232 | * @error: return location for errors |
---|
233 | * |
---|
234 | * Loads a new #GdkPixbuf from @file_name and returns it. The caller must |
---|
235 | * assume the reference to the reurned pixbuf. If an error occurred, @error is |
---|
236 | * set and %NULL is returned. Returned handle is closed by this call and must be |
---|
237 | * freed by the caller. |
---|
238 | * |
---|
239 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
240 | **/ |
---|
241 | GdkPixbuf * |
---|
242 | rsvg_pixbuf_from_file_ex (RsvgHandle * handle, |
---|
243 | const gchar *file_name, |
---|
244 | GError **error) |
---|
245 | { |
---|
246 | return rsvg_pixbuf_from_file_at_size_ex (handle, file_name, -1, -1, error); |
---|
247 | } |
---|
248 | |
---|
249 | /** |
---|
250 | * rsvg_pixbuf_from_file_at_zoom_ex: |
---|
251 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
---|
252 | * @file_name: A file name |
---|
253 | * @x_zoom: The horizontal zoom factor |
---|
254 | * @y_zoom: The vertical zoom factor |
---|
255 | * @error: return location for errors |
---|
256 | * |
---|
257 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
---|
258 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. The |
---|
259 | * caller must assume the reference to the returned pixbuf. If an error |
---|
260 | * occurred, @error is set and %NULL is returned. Returned handle is closed by this |
---|
261 | * call and must be freed by the caller. |
---|
262 | * |
---|
263 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
264 | **/ |
---|
265 | GdkPixbuf * |
---|
266 | rsvg_pixbuf_from_file_at_zoom_ex (RsvgHandle * handle, |
---|
267 | const gchar *file_name, |
---|
268 | double x_zoom, |
---|
269 | double y_zoom, |
---|
270 | GError **error) |
---|
271 | { |
---|
272 | struct RsvgSizeCallbackData data; |
---|
273 | |
---|
274 | g_return_val_if_fail (file_name != NULL, NULL); |
---|
275 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
---|
276 | |
---|
277 | data.type = RSVG_SIZE_ZOOM; |
---|
278 | data.x_zoom = x_zoom; |
---|
279 | data.y_zoom = y_zoom; |
---|
280 | |
---|
281 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
---|
282 | } |
---|
283 | |
---|
284 | /** |
---|
285 | * rsvg_pixbuf_from_file_at_max_size_ex: |
---|
286 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
---|
287 | * @file_name: A file name |
---|
288 | * @max_width: The requested max width |
---|
289 | * @max_height: The requested max heigh |
---|
290 | * @error: return location for errors |
---|
291 | * |
---|
292 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is uniformly |
---|
293 | * scaled so that the it fits into a rectangle of size max_width * max_height. The |
---|
294 | * caller must assume the reference to the returned pixbuf. If an error occurred, |
---|
295 | * @error is set and %NULL is returned. Returned handle is closed by this call and |
---|
296 | * must be freed by the caller. |
---|
297 | * |
---|
298 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
299 | **/ |
---|
300 | GdkPixbuf * |
---|
301 | rsvg_pixbuf_from_file_at_max_size_ex (RsvgHandle * handle, |
---|
302 | const gchar *file_name, |
---|
303 | gint max_width, |
---|
304 | gint max_height, |
---|
305 | GError **error) |
---|
306 | { |
---|
307 | struct RsvgSizeCallbackData data; |
---|
308 | |
---|
309 | data.type = RSVG_SIZE_WH_MAX; |
---|
310 | data.width = max_width; |
---|
311 | data.height = max_height; |
---|
312 | |
---|
313 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
---|
314 | } |
---|
315 | |
---|
316 | /** |
---|
317 | * rsvg_pixbuf_from_file_at_zoom_with_max_ex: |
---|
318 | * @handle: The RSVG handle you wish to render with (either normal or gzipped) |
---|
319 | * @file_name: A file name |
---|
320 | * @x_zoom: The horizontal zoom factor |
---|
321 | * @y_zoom: The vertical zoom factor |
---|
322 | * @max_width: The requested max width |
---|
323 | * @max_height: The requested max heigh |
---|
324 | * @error: return location for errors |
---|
325 | * |
---|
326 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
---|
327 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. If the |
---|
328 | * resulting pixbuf would be larger than max_width/max_heigh it is uniformly scaled |
---|
329 | * down to fit in that rectangle. The caller must assume the reference to the |
---|
330 | * returned pixbuf. If an error occurred, @error is set and %NULL is returned. |
---|
331 | * Returned handle is closed by this call and must be freed by the caller. |
---|
332 | * |
---|
333 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
334 | **/ |
---|
335 | GdkPixbuf * |
---|
336 | rsvg_pixbuf_from_file_at_zoom_with_max_ex (RsvgHandle * handle, |
---|
337 | const gchar *file_name, |
---|
338 | double x_zoom, |
---|
339 | double y_zoom, |
---|
340 | gint max_width, |
---|
341 | gint max_height, |
---|
342 | GError **error) |
---|
343 | { |
---|
344 | struct RsvgSizeCallbackData data; |
---|
345 | |
---|
346 | g_return_val_if_fail (file_name != NULL, NULL); |
---|
347 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
---|
348 | |
---|
349 | data.type = RSVG_SIZE_ZOOM_MAX; |
---|
350 | data.x_zoom = x_zoom; |
---|
351 | data.y_zoom = y_zoom; |
---|
352 | data.width = max_width; |
---|
353 | data.height = max_height; |
---|
354 | |
---|
355 | return rsvg_pixbuf_from_file_with_size_data_ex (handle, file_name, &data, error); |
---|
356 | } |
---|
357 | |
---|
358 | /** |
---|
359 | * rsvg_pixbuf_from_file: |
---|
360 | * @file_name: A file name |
---|
361 | * @error: return location for errors |
---|
362 | * |
---|
363 | * Loads a new #GdkPixbuf from @file_name and returns it. The caller must |
---|
364 | * assume the reference to the reurned pixbuf. If an error occurred, @error is |
---|
365 | * set and %NULL is returned. |
---|
366 | * |
---|
367 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
368 | **/ |
---|
369 | GdkPixbuf * |
---|
370 | rsvg_pixbuf_from_file (const gchar *file_name, |
---|
371 | GError **error) |
---|
372 | { |
---|
373 | return rsvg_pixbuf_from_file_at_size (file_name, -1, -1, error); |
---|
374 | } |
---|
375 | |
---|
376 | /** |
---|
377 | * rsvg_pixbuf_from_file_at_zoom: |
---|
378 | * @file_name: A file name |
---|
379 | * @x_zoom: The horizontal zoom factor |
---|
380 | * @y_zoom: The vertical zoom factor |
---|
381 | * @error: return location for errors |
---|
382 | * |
---|
383 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
---|
384 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. The |
---|
385 | * caller must assume the reference to the returned pixbuf. If an error |
---|
386 | * occurred, @error is set and %NULL is returned. |
---|
387 | * |
---|
388 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
389 | **/ |
---|
390 | GdkPixbuf * |
---|
391 | rsvg_pixbuf_from_file_at_zoom (const gchar *file_name, |
---|
392 | double x_zoom, |
---|
393 | double y_zoom, |
---|
394 | GError **error) |
---|
395 | { |
---|
396 | struct RsvgSizeCallbackData data; |
---|
397 | |
---|
398 | g_return_val_if_fail (file_name != NULL, NULL); |
---|
399 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
---|
400 | |
---|
401 | data.type = RSVG_SIZE_ZOOM; |
---|
402 | data.x_zoom = x_zoom; |
---|
403 | data.y_zoom = y_zoom; |
---|
404 | |
---|
405 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
---|
406 | } |
---|
407 | |
---|
408 | /** |
---|
409 | * rsvg_pixbuf_from_file_at_zoom_with_max: |
---|
410 | * @file_name: A file name |
---|
411 | * @x_zoom: The horizontal zoom factor |
---|
412 | * @y_zoom: The vertical zoom factor |
---|
413 | * @max_width: The requested max width |
---|
414 | * @max_height: The requested max heigh |
---|
415 | * @error: return location for errors |
---|
416 | * |
---|
417 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
---|
418 | * from the size indicated by the file by a factor of @x_zoom and @y_zoom. If the |
---|
419 | * resulting pixbuf would be larger than max_width/max_heigh it is uniformly scaled |
---|
420 | * down to fit in that rectangle. The caller must assume the reference to the |
---|
421 | * returned pixbuf. If an error occurred, @error is set and %NULL is returned. |
---|
422 | * |
---|
423 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
424 | **/ |
---|
425 | GdkPixbuf * |
---|
426 | rsvg_pixbuf_from_file_at_zoom_with_max (const gchar *file_name, |
---|
427 | double x_zoom, |
---|
428 | double y_zoom, |
---|
429 | gint max_width, |
---|
430 | gint max_height, |
---|
431 | GError **error) |
---|
432 | { |
---|
433 | struct RsvgSizeCallbackData data; |
---|
434 | |
---|
435 | g_return_val_if_fail (file_name != NULL, NULL); |
---|
436 | g_return_val_if_fail (x_zoom > 0.0 && y_zoom > 0.0, NULL); |
---|
437 | |
---|
438 | data.type = RSVG_SIZE_ZOOM_MAX; |
---|
439 | data.x_zoom = x_zoom; |
---|
440 | data.y_zoom = y_zoom; |
---|
441 | data.width = max_width; |
---|
442 | data.height = max_height; |
---|
443 | |
---|
444 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
---|
445 | } |
---|
446 | |
---|
447 | /** |
---|
448 | * rsvg_pixbuf_from_file_at_size: |
---|
449 | * @file_name: A file name |
---|
450 | * @width: The new width, or -1 |
---|
451 | * @height: The new height, or -1 |
---|
452 | * @error: return location for errors |
---|
453 | * |
---|
454 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is scaled |
---|
455 | * from the size indicated to the new size indicated by @width and @height. If |
---|
456 | * either of these are -1, then the default size of the image being loaded is |
---|
457 | * used. The caller must assume the reference to the returned pixbuf. If an |
---|
458 | * error occurred, @error is set and %NULL is returned. |
---|
459 | * |
---|
460 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
461 | **/ |
---|
462 | GdkPixbuf * |
---|
463 | rsvg_pixbuf_from_file_at_size (const gchar *file_name, |
---|
464 | gint width, |
---|
465 | gint height, |
---|
466 | GError **error) |
---|
467 | { |
---|
468 | struct RsvgSizeCallbackData data; |
---|
469 | |
---|
470 | data.type = RSVG_SIZE_WH; |
---|
471 | data.width = width; |
---|
472 | data.height = height; |
---|
473 | |
---|
474 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
---|
475 | } |
---|
476 | |
---|
477 | /** |
---|
478 | * rsvg_pixbuf_from_file_at_max_size: |
---|
479 | * @file_name: A file name |
---|
480 | * @max_width: The requested max width |
---|
481 | * @max_height: The requested max heigh |
---|
482 | * @error: return location for errors |
---|
483 | * |
---|
484 | * Loads a new #GdkPixbuf from @file_name and returns it. This pixbuf is uniformly |
---|
485 | * scaled so that the it fits into a rectangle of size max_width * max_height. The |
---|
486 | * caller must assume the reference to the returned pixbuf. If an error occurred, |
---|
487 | * @error is set and %NULL is returned. |
---|
488 | * |
---|
489 | * Return value: A newly allocated #GdkPixbuf, or %NULL |
---|
490 | **/ |
---|
491 | GdkPixbuf * |
---|
492 | rsvg_pixbuf_from_file_at_max_size (const gchar *file_name, |
---|
493 | gint max_width, |
---|
494 | gint max_height, |
---|
495 | GError **error) |
---|
496 | { |
---|
497 | struct RsvgSizeCallbackData data; |
---|
498 | |
---|
499 | data.type = RSVG_SIZE_WH_MAX; |
---|
500 | data.width = max_width; |
---|
501 | data.height = max_height; |
---|
502 | |
---|
503 | return rsvg_pixbuf_from_file_with_size_data (file_name, &data, error); |
---|
504 | } |
---|