summaryrefslogtreecommitdiff
path: root/image/gif.c
blob: 8ec0a6ef4043aa0277d9fc1015da1913e7ceff6b (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
/*
 * This file is part of NetSurf, http://netsurf.sourceforge.net/
 * Licensed under the GNU General Public License,
 *		  http://www.opensource.org/licenses/gpl-license
 * Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
 * Copyright 2004 Richard Wilson <not_ginger_matt@users.sourceforge.net>
 */

#include <assert.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/desktop/browser.h"
#include "netsurf/desktop/options.h"
#include "netsurf/desktop/plotters.h"
#include "netsurf/image/bitmap.h"
#include "netsurf/image/gif.h"
#include "netsurf/image/gifread.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/messages.h"
#include "netsurf/utils/utils.h"


/*	GIF FUNCTIONALITY
	=================

	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
*/

#ifdef WITH_GIF

static void nsgif_animate(void *p);
static void nsgif_get_frame(struct content *c);


bool nsgif_create(struct content *c, const char *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);
		warn_user("NoMemory", 0);
		return false;
	}
	return true;
}


bool nsgif_convert(struct content *c, int iwidth, int iheight) {
	int res;
	struct gif_animation *gif;
	union content_msg_data msg_data;

	/*	Create our animation
	*/
	gif = c->data.gif.gif;
	gif->gif_data = c->source_data;
	gif->buffer_size = c->source_size;
	gif->buffer_position = 0;

	/*	Initialise the GIF
	*/
	res = gif_initialise(gif);
	switch (res) {
		case GIF_INSUFFICIENT_MEMORY:
			msg_data.error = messages_get("NoMemory");
			content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
			warn_user("NoMemory", 0);
			return false;
		case GIF_INSUFFICIENT_DATA:
		case GIF_DATA_ERROR:
			msg_data.error = messages_get("BadGIF");
			content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
			return false;
	}

	/*	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;
	c->title = malloc(100);
	if (c->title)
		snprintf(c->title, 100, messages_get("GIFTitle"), c->width, c->height, c->source_size);
	c->size += (gif->width * gif->height * 4) + 16 + 44 + 100;

	/*	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);

	/*	Exit as a success
	*/
	c->bitmap = gif->frame_image;
	c->status = CONTENT_STATUS_DONE;
	return true;
}


bool nsgif_redraw(struct content *c, int x, int y,
		int width, int height,
		int clip_x0, int clip_y0, int clip_x1, int clip_y1,
		float scale, unsigned long background_colour) {

	if (c->data.gif.current_frame != c->data.gif.gif->decoded_frame)
		nsgif_get_frame(c);
	c->bitmap = c->data.gif.gif->frame_image;
	return plot.bitmap(x, y, width, height,	c->bitmap, background_colour);
}


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);
	free(c->title);
}


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

	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++)
		gif_decode_frame(c->data.gif.gif, frame);
}


/**	Performs any necessary animation.

	@param	c		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)
		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 > 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 > 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 ((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 ((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 == gif->width) &&
				(data.redraw.height == 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);
}

#endif