summaryrefslogtreecommitdiff
path: root/image/gif.c
blob: e449db345137623fc724101d1827968971122d49 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
/*
 * Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
 * Copyright 2004 Richard Wilson <not_ginger_matt@users.sourceforge.net>
 * Copyright 2008 Sean Fox <dyntryx@gmail.com>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/** \file
 * Content for image/gif (implementation)
 *
 * All GIFs are dynamically decompressed using the routines that gifread.c
 * provides. Whilst this allows support for progressive decoding, it is
 * not implemented here as NetSurf currently does not provide such support.
 *
 * [rjw] - Sun 4th April 2004
 */

#include "utils/config.h"
#ifdef WITH_GIF

#include <assert.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <libnsgif.h>
#include "utils/config.h"
#include "content/content_protected.h"
#include "desktop/options.h"
#include "desktop/plotters.h"
#include "image/bitmap.h"
#include "image/gif.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/schedule.h"
#include "utils/utils.h"

static void nsgif_invalidate(void *bitmap, void *private_word);
static void nsgif_animate(void *p);
static gif_result nsgif_get_frame(struct content *c);

/* The Bitmap callbacks function table;
 * necessary for interaction with nsgiflib.
 */
gif_bitmap_callback_vt gif_bitmap_callbacks = {
	.bitmap_create = nsgif_bitmap_create,
	.bitmap_destroy = bitmap_destroy,
	.bitmap_get_buffer = bitmap_get_buffer,
	.bitmap_set_opaque = bitmap_set_opaque,
	.bitmap_test_opaque = bitmap_test_opaque,
	.bitmap_modified = bitmap_modified
};


bool nsgif_create(struct content *c, const struct http_parameter *params)
{
	union content_msg_data msg_data;
	/* Initialise our data structure */
	c->data.gif.gif = calloc(sizeof(gif_animation), 1);
	if (!c->data.gif.gif) {
		msg_data.error = messages_get("NoMemory");
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}
	gif_create(c->data.gif.gif, &gif_bitmap_callbacks);
	return true;
}


bool nsgif_convert(struct content *c)
{
	int res;
	struct gif_animation *gif;
	union content_msg_data msg_data;
	const char *data;
	unsigned long size;
	char title[100];

	/* Get the animation */
	gif = c->data.gif.gif;

	data = content__get_source_data(c, &size);

	/* Initialise the GIF */
	do {
		res = gif_initialise(gif, size, (unsigned char *) data);
		if (res != GIF_OK && res != GIF_WORKING && 
				res != GIF_INSUFFICIENT_FRAME_DATA) {
			switch (res) {
			case GIF_FRAME_DATA_ERROR:
			case GIF_INSUFFICIENT_DATA:
			case GIF_DATA_ERROR:
				msg_data.error = messages_get("BadGIF");
				break;
			case GIF_INSUFFICIENT_MEMORY:
				msg_data.error = messages_get("NoMemory");
				break;
			}
			content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
			return false;
		}
	} while (res != GIF_OK && res != GIF_INSUFFICIENT_FRAME_DATA);

	/* Abort on bad GIFs */
	if ((gif->frame_count_partial == 0) || (gif->width == 0) ||
			(gif->height == 0)) {
		msg_data.error = messages_get("BadGIF");
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	/* Store our content width and description */
	c->width = gif->width;
	c->height = gif->height;
	snprintf(title, sizeof(title), messages_get("GIFTitle"),
			c->width, c->height, size);
	content__set_title(c, title);
	c->size += (gif->width * gif->height * 4) + 16 + 44;

	/* Schedule the animation if we have one */
	c->data.gif.current_frame = 0;
	if (gif->frame_count_partial > 1)
		schedule(gif->frames[0].frame_delay, nsgif_animate, c);
	else
		bitmap_set_suspendable(gif->frame_image, gif, nsgif_invalidate);

	/* Exit as a success */
	c->bitmap = gif->frame_image;
	content_set_ready(c);
	content_set_done(c);
	/* Done: update status bar */
	content_set_status(c, "");
	return true;
}

void nsgif_invalidate(void *bitmap, void *private_word)
{
	struct gif_animation *gif = (struct gif_animation *)private_word;

	gif->decoded_frame = -1;
}

bool nsgif_redraw(struct content *c, int x, int y,
		int width, int height, const struct rect *clip,
		float scale, colour background_colour)
{
	if (c->data.gif.current_frame != c->data.gif.gif->decoded_frame)
		if (nsgif_get_frame(c) != GIF_OK)
			return false;
	c->bitmap = c->data.gif.gif->frame_image;
	if ((width == -1) && (height == -1))
		return true;
	return plot.bitmap(x, y, width, height,	c->bitmap,
			background_colour, BITMAPF_NONE);
}


bool nsgif_redraw_tiled(struct content *c, int x, int y,
		int width, int height, const struct rect *clip,
		float scale, colour background_colour,
		bool repeat_x, bool repeat_y)
{
	bitmap_flags_t flags = BITMAPF_NONE;

	if (c->data.gif.current_frame != c->data.gif.gif->decoded_frame)
		if (nsgif_get_frame(c) != GIF_OK)
			return false;

	c->bitmap = c->data.gif.gif->frame_image;
            
	if (repeat_x)
		flags |= BITMAPF_REPEAT_X;
	if (repeat_y)
		flags |= BITMAPF_REPEAT_Y;

	return plot.bitmap(x, y, width, height, c->bitmap, background_colour, flags);
}


void nsgif_destroy(struct content *c)
{
	/* Free all the associated memory buffers */
	schedule_remove(nsgif_animate, c);
	gif_finalise(c->data.gif.gif);
	free(c->data.gif.gif);
}


bool nsgif_clone(const struct content *old, struct content *new_content)
{
	/* Simply replay creation and conversion of content */
	if (nsgif_create(new_content, NULL) == false)
		return false;

	if (old->status == CONTENT_STATUS_READY ||
			old->status == CONTENT_STATUS_DONE) {
		if (nsgif_convert(new_content) == false)
			return false;
	}

	return true;
}


/**
 * Updates the GIF bitmap to display the current frame
 *
 * \param c  the content to update
 */
gif_result nsgif_get_frame(struct content *c)
{
	int previous_frame, current_frame, frame;
	gif_result res = GIF_OK;

	current_frame = c->data.gif.current_frame;
	if (!option_animate_images)
		current_frame = 0;
	if (current_frame < c->data.gif.gif->decoded_frame)
		previous_frame = 0;
	else
		previous_frame = c->data.gif.gif->decoded_frame + 1;
	for (frame = previous_frame; frame <= current_frame; frame++)
		res = gif_decode_frame(c->data.gif.gif, frame);

	return res;
}


/**
 * Performs any necessary animation.
 *
 * \param p  The content to animate
*/
void nsgif_animate(void *p)
{
	struct content *c = p;
	union content_msg_data data;
	struct gif_animation *gif;
	int delay;
	int f;

	/* Advance by a frame, updating the loop count accordingly */
	gif = c->data.gif.gif;
	c->data.gif.current_frame++;
	if (c->data.gif.current_frame == (int)gif->frame_count_partial) {
		c->data.gif.current_frame = 0;

		/* A loop count of 0 has a special meaning of infinite */
		if (gif->loop_count != 0) {
			gif->loop_count--;
			if (gif->loop_count == 0) {
				c->data.gif.current_frame =
						gif->frame_count_partial - 1;
				gif->loop_count = -1;
			}
		}
	}

	/* Continue animating if we should */
	if (gif->loop_count >= 0) {
		delay = gif->frames[c->data.gif.current_frame].frame_delay;
		if (delay < option_minimum_gif_delay)
			delay = option_minimum_gif_delay;
		schedule(delay, nsgif_animate, c);
	}

	if ((!option_animate_images) ||
			(!gif->frames[c->data.gif.current_frame].display))
		return;

	/* area within gif to redraw */
	f = c->data.gif.current_frame;
	data.redraw.x = gif->frames[f].redraw_x;
	data.redraw.y = gif->frames[f].redraw_y;
	data.redraw.width = gif->frames[f].redraw_width;
	data.redraw.height = gif->frames[f].redraw_height;

	/* redraw background (true) or plot on top (false) */
	if (c->data.gif.current_frame > 0) {
		data.redraw.full_redraw = gif->frames[f - 1].redraw_required;
		/* previous frame needed clearing: expand the redraw area to
		 * cover it */
		if (data.redraw.full_redraw) {
			if (data.redraw.x >
					(int)(gif->frames[f - 1].redraw_x)) {
				data.redraw.width += data.redraw.x -
						gif->frames[f - 1].redraw_x;
				data.redraw.x = gif->frames[f - 1].redraw_x;
			}
			if (data.redraw.y >
					(int)(gif->frames[f - 1].redraw_y)) {
				data.redraw.height += (data.redraw.y -
						gif->frames[f - 1].redraw_y);
				data.redraw.y = gif->frames[f - 1].redraw_y;
			}
			if ((int)(gif->frames[f - 1].redraw_x +
					gif->frames[f - 1].redraw_width) >
					(data.redraw.x + data.redraw.width))
				data.redraw.width =
						gif->frames[f - 1].redraw_x -
						data.redraw.x +
						gif->frames[f - 1].redraw_width;
			if ((int)(gif->frames[f - 1].redraw_y +
					gif->frames[f - 1].redraw_height) >
					(data.redraw.y + data.redraw.height))
				data.redraw.height =
						gif->frames[f - 1].redraw_y -
						data.redraw.y +
						gif->frames[f - 1].
								redraw_height;
		}
	} else {
		/* do advanced check */
		if ((data.redraw.x == 0) && (data.redraw.y == 0) &&
				(data.redraw.width == (int)(gif->width)) &&
				(data.redraw.height == (int)(gif->height))) {
			data.redraw.full_redraw = !gif->frames[f].opaque;
		} else {
			data.redraw.full_redraw = true;
			data.redraw.x = 0;
			data.redraw.y = 0;
			data.redraw.width = gif->width;
			data.redraw.height = gif->height;
		}
	}

	/* other data */
	data.redraw.object = c;
	data.redraw.object_x = 0;
	data.redraw.object_y = 0;
	data.redraw.object_width = c->width;
	data.redraw.object_height = c->height;

	content_broadcast(c, CONTENT_MSG_REDRAW, data);
}


/**
 * Callback for libnsgif; forwards the call to bitmap_create()
 *
 * \param  width   width of image in pixels
 * \param  height  width of image in pixels
 * \return an opaque struct bitmap, or NULL on memory exhaustion
 */
void *nsgif_bitmap_create(int width, int height)
{
	return bitmap_create(width, height, BITMAP_NEW);
}

#endif