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netsurf/image/gif.c

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/*
* 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 <assert.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <libnsgif.h>
#include "utils/config.h"
#include "content/content_protected.h"
#include "content/hlcache.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/talloc.h"
#include "utils/utils.h"
typedef struct nsgif_content {
struct content base;
struct gif_animation *gif; /**< GIF animation data */
int current_frame; /**< current frame to display [0...(max-1)] */
} nsgif_content;
/**
* 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
*/
static void *nsgif_bitmap_create(int width, int height)
{
return bitmap_create(width, height, BITMAP_NEW);
}
/* The Bitmap callbacks function table;
* necessary for interaction with nsgiflib.
*/
static 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
};
static nserror nsgif_create_gif_data(nsgif_content *c)
{
union content_msg_data msg_data;
/* Initialise our data structure */
c->gif = calloc(sizeof(gif_animation), 1);
if (c->gif == NULL) {
msg_data.error = messages_get("NoMemory");
content_broadcast(&c->base, CONTENT_MSG_ERROR, msg_data);
return NSERROR_NOMEM;
}
gif_create(c->gif, &gif_bitmap_callbacks);
return NSERROR_OK;
}
static nserror nsgif_create(const content_handler *handler,
lwc_string *imime_type, const struct http_parameter *params,
llcache_handle *llcache, const char *fallback_charset,
bool quirks, struct content **c)
{
nsgif_content *result;
nserror error;
result = talloc_zero(0, nsgif_content);
if (result == NULL)
return NSERROR_NOMEM;
error = content__init(&result->base, handler, imime_type, params,
llcache, fallback_charset, quirks);
if (error != NSERROR_OK) {
talloc_free(result);
return error;
}
error = nsgif_create_gif_data(result);
if (error != NSERROR_OK) {
talloc_free(result);
return error;
}
*c = (struct content *) result;
return NSERROR_OK;
}
/**
* Performs any necessary animation.
*
* \param p The content to animate
*/
static void nsgif_animate(void *p)
{
nsgif_content *gif = p;
union content_msg_data data;
int delay;
int f;
/* Advance by a frame, updating the loop count accordingly */
gif->current_frame++;
if (gif->current_frame == (int)gif->gif->frame_count_partial) {
gif->current_frame = 0;
/* A loop count of 0 has a special meaning of infinite */
if (gif->gif->loop_count != 0) {
gif->gif->loop_count--;
if (gif->gif->loop_count == 0) {
gif->current_frame =
gif->gif->frame_count_partial - 1;
gif->gif->loop_count = -1;
}
}
}
/* Continue animating if we should */
if (gif->gif->loop_count >= 0) {
delay = gif->gif->frames[gif->current_frame].frame_delay;
if (delay < option_minimum_gif_delay)
delay = option_minimum_gif_delay;
schedule(delay, nsgif_animate, gif);
}
if ((!option_animate_images) ||
(!gif->gif->frames[gif->current_frame].display))
return;
/* area within gif to redraw */
f = gif->current_frame;
data.redraw.x = gif->gif->frames[f].redraw_x;
data.redraw.y = gif->gif->frames[f].redraw_y;
data.redraw.width = gif->gif->frames[f].redraw_width;
data.redraw.height = gif->gif->frames[f].redraw_height;
/* redraw background (true) or plot on top (false) */
if (gif->current_frame > 0) {
data.redraw.full_redraw =
gif->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->gif->frames[f - 1].redraw_x)) {
data.redraw.width += data.redraw.x -
gif->gif->frames[f - 1].redraw_x;
data.redraw.x =
gif->gif->frames[f - 1].redraw_x;
}
if (data.redraw.y >
(int)(gif->gif->frames[f - 1].redraw_y)) {
data.redraw.height += (data.redraw.y -
gif->gif->frames[f - 1].redraw_y);
data.redraw.y =
gif->gif->frames[f - 1].redraw_y;
}
if ((int)(gif->gif->frames[f - 1].redraw_x +
gif->gif->frames[f - 1].redraw_width) >
(data.redraw.x + data.redraw.width))
data.redraw.width =
gif->gif->frames[f - 1].redraw_x -
data.redraw.x +
gif->gif->frames[f - 1].redraw_width;
if ((int)(gif->gif->frames[f - 1].redraw_y +
gif->gif->frames[f - 1].redraw_height) >
(data.redraw.y + data.redraw.height))
data.redraw.height =
gif->gif->frames[f - 1].redraw_y -
data.redraw.y +
gif->gif->frames[f - 1].redraw_height;
}
} else {
/* do advanced check */
if ((data.redraw.x == 0) && (data.redraw.y == 0) &&
(data.redraw.width == (int)(gif->gif->width)) &&
(data.redraw.height == (int)(gif->gif->height))) {
data.redraw.full_redraw = !gif->gif->frames[f].opaque;
} else {
data.redraw.full_redraw = true;
data.redraw.x = 0;
data.redraw.y = 0;
data.redraw.width = gif->gif->width;
data.redraw.height = gif->gif->height;
}
}
/* other data */
data.redraw.object = (struct content *) gif;
data.redraw.object_x = 0;
data.redraw.object_y = 0;
data.redraw.object_width = gif->base.width;
data.redraw.object_height = gif->base.height;
content_broadcast(&gif->base, CONTENT_MSG_REDRAW, data);
}
static void nsgif_invalidate(void *bitmap, void *private_word)
{
struct gif_animation *gif = (struct gif_animation *)private_word;
gif->decoded_frame = -1;
}
static bool nsgif_convert(struct content *c)
{
nsgif_content *gif = (nsgif_content *) c;
int res;
union content_msg_data msg_data;
const char *data;
unsigned long size;
char title[100];
/* Get the animation */
data = content__get_source_data(c, &size);
/* Initialise the GIF */
do {
res = gif_initialise(gif->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->gif->frame_count_partial == 0) || (gif->gif->width == 0) ||
(gif->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->gif->width;
c->height = gif->gif->height;
snprintf(title, sizeof(title), messages_get("GIFTitle"),
c->width, c->height, size);
content__set_title(c, title);
c->size += (gif->gif->width * gif->gif->height * 4) + 16 + 44;
/* Schedule the animation if we have one */
gif->current_frame = 0;
if (gif->gif->frame_count_partial > 1)
schedule(gif->gif->frames[0].frame_delay, nsgif_animate, c);
else
bitmap_set_suspendable(gif->gif->frame_image, gif->gif,
nsgif_invalidate);
/* Exit as a success */
content_set_ready(c);
content_set_done(c);
/* Done: update status bar */
content_set_status(c, "");
return true;
}
/**
* Updates the GIF bitmap to display the current frame
*
* \param c the content to update
*/
static gif_result nsgif_get_frame(nsgif_content *gif)
{
int previous_frame, current_frame, frame;
gif_result res = GIF_OK;
current_frame = gif->current_frame;
if (!option_animate_images)
current_frame = 0;
if (current_frame < gif->gif->decoded_frame)
previous_frame = 0;
else
previous_frame = gif->gif->decoded_frame + 1;
for (frame = previous_frame; frame <= current_frame; frame++) {
res = gif_decode_frame(gif->gif, frame);
}
return res;
}
static bool nsgif_redraw(struct content *c, struct content_redraw_data *data,
const struct rect *clip, const struct redraw_context *ctx)
{
nsgif_content *gif = (nsgif_content *) c;
bitmap_flags_t flags = BITMAPF_NONE;
if (gif->current_frame != gif->gif->decoded_frame) {
if (nsgif_get_frame(gif) != GIF_OK) {
return false;
}
}
if ((data->width == -1) && (data->height == -1))
return true;
if (data->repeat_x)
flags |= BITMAPF_REPEAT_X;
if (data->repeat_y)
flags |= BITMAPF_REPEAT_Y;
return ctx->plot->bitmap(data->x, data->y, data->width, data->height,
gif->gif->frame_image, data->background_colour, flags);
}
static void nsgif_destroy(struct content *c)
{
nsgif_content *gif = (nsgif_content *) c;
/* Free all the associated memory buffers */
schedule_remove(nsgif_animate, c);
gif_finalise(gif->gif);
free(gif->gif);
}
static nserror nsgif_clone(const struct content *old, struct content **newc)
{
nsgif_content *gif;
nserror error;
gif = talloc_zero(0, nsgif_content);
if (gif == NULL)
return NSERROR_NOMEM;
error = content__clone(old, &gif->base);
if (error != NSERROR_OK) {
content_destroy(&gif->base);
return error;
}
/* Simply replay creation and conversion of content */
error = nsgif_create_gif_data(gif);
if (error != NSERROR_OK) {
content_destroy(&gif->base);
return error;
}
if (old->status == CONTENT_STATUS_READY ||
old->status == CONTENT_STATUS_DONE) {
if (nsgif_convert(&gif->base) == false) {
content_destroy(&gif->base);
return NSERROR_CLONE_FAILED;
}
}
*newc = (struct content *) gif;
return NSERROR_OK;
}
static void *nsgif_get_internal(const struct content *c, void *context)
{
nsgif_content *gif = (nsgif_content *) c;
if (gif->current_frame != gif->gif->decoded_frame) {
if (nsgif_get_frame(gif) != GIF_OK)
return NULL;
}
return gif->gif->frame_image;
}
static content_type nsgif_content_type(void)
{
return CONTENT_IMAGE;
}
static const content_handler nsgif_content_handler = {
.create = nsgif_create,
.data_complete = nsgif_convert,
.destroy = nsgif_destroy,
.redraw = nsgif_redraw,
.clone = nsgif_clone,
.get_internal = nsgif_get_internal,
.type = nsgif_content_type,
.no_share = false,
};
static const char *nsgif_types[] = {
"image/gif"
};
CONTENT_FACTORY_REGISTER_TYPES(nsgif, nsgif_types, nsgif_content_handler);
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