netsurf/image/webp.c

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/*
* Copyright 2010 Chris Young <chris@unsatisfactorysoftware.co.uk>
*
* 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/webp (libwebp implementation).
*
*/
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <webp/decode.h>
#include "desktop/plotters.h"
#include "image/bitmap.h"
#include "content/content_protected.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/utils.h"
typedef struct webp_content
{
struct content base;
struct bitmap *bitmap; /**< Created NetSurf bitmap */
} webp_content;
static nserror webp_create(const content_handler *handler,
lwc_string *imime_type, const http_parameter *params,
llcache_handle *llcache, const char *fallback_charset,
bool quirks, struct content **c)
{
webp_content *webp;
nserror error;
webp = talloc_zero(0, webp_content);
if (webp == NULL)
return NSERROR_NOMEM;
error = content__init(&webp->base, handler, imime_type, params,
llcache, fallback_charset, quirks);
if (error != NSERROR_OK) {
talloc_free(webp);
return error;
}
*c = (struct content *) webp;
return NSERROR_OK;
}
/**
* Convert a CONTENT_WEBP for display.
*
* No conversion is necessary. We merely read the WebP dimensions.
*/
static bool webp_convert(struct content *c)
{
webp_content *webp = (webp_content *)c;
union content_msg_data msg_data;
const uint8_t *data;
unsigned char *imagebuf = NULL;
unsigned long size;
int width = 0, height = 0;
char title[100];
int res = 0;
uint8_t *res_p = NULL;
data = (uint8_t *)content__get_source_data(c, &size);
res = WebPGetInfo(data, size, &width, &height);
if (res == 0) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
webp->bitmap = bitmap_create(width, height, BITMAP_NEW | BITMAP_OPAQUE);
if (!webp->bitmap) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
imagebuf = bitmap_get_buffer(webp->bitmap);
if (!imagebuf) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
unsigned int row_width = bitmap_get_rowstride(webp->bitmap);
res_p = WebPDecodeRGBAInto(data, size, imagebuf,
row_width * height, row_width);
if (res_p == NULL) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
c->width = width;
c->height = height;
snprintf(title, sizeof(title), messages_get("WebPTitle"),
width, height, size);
content__set_title(c, title);
bitmap_modified(webp->bitmap);
content_set_ready(c);
content_set_done(c);
content_set_status(c, "");
return true;
}
/**
* Destroy a CONTENT_WEBP and free all resources it owns.
*/
static void webp_destroy(struct content *c)
{
webp_content *webp = (webp_content *)c;
if (webp->bitmap != NULL)
bitmap_destroy(webp->bitmap);
}
/**
* Redraw a CONTENT_WEBP.
*/
static bool webp_redraw(struct content *c, struct content_redraw_data *data,
const struct rect *clip, const struct redraw_context *ctx)
{
webp_content *webp = (webp_content *)c;
bitmap_flags_t flags = BITMAPF_NONE;
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,
webp->bitmap, data->background_colour, flags);
}
static nserror webp_clone(const struct content *old, struct content **newc)
{
webp_content *webp;
nserror error;
webp = talloc_zero(0, webp_content);
if (webp == NULL)
return NSERROR_NOMEM;
error = content__clone(old, &webp->base);
if (error != NSERROR_OK) {
content_destroy(&webp->base);
return error;
}
/* Simply replay convert */
if (old->status == CONTENT_STATUS_READY ||
old->status == CONTENT_STATUS_DONE) {
if (webp_convert(&webp->base) == false) {
content_destroy(&webp->base);
return NSERROR_CLONE_FAILED;
}
}
*newc = (struct content *) webp;
return NSERROR_OK;
}
static void *webp_get_internal(const struct content *c, void *context)
{
webp_content *webp = (webp_content *)c;
return webp->bitmap;
}
static content_type webp_content_type(void)
{
return CONTENT_IMAGE;
}
static const content_handler webp_content_handler = {
.create = webp_create,
.data_complete = webp_convert,
.destroy = webp_destroy,
.redraw = webp_redraw,
.clone = webp_clone,
.get_internal = webp_get_internal,
.type = webp_content_type,
.no_share = false,
};
static const char *webp_types[] = {
"image/webp"
};
CONTENT_FACTORY_REGISTER_TYPES(webp, webp_types, webp_content_handler);