netsurf/image/rsvg.c

323 lines
8.2 KiB
C

/*
* Copyright 2007 Rob Kendrick <rjek@netsurf-browser.org>
*
* 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 handler for image/svg using librsvg (implementation).
*
* SVG files are rendered to a NetSurf bitmap by creating a Cairo rendering
* surface (content_rsvg_data.cs) over the bitmap's data, creating a Cairo
* drawing context using that surface, and then passing that drawing context
* to librsvg which then uses Cairo calls to plot the graphic to the bitmap.
* We store this in content->bitmap, and then use the usual bitmap plotter
* function to render it for redraw requests.
*/
#include <stdbool.h>
#include <assert.h>
#include <string.h>
#include <sys/types.h>
#include <librsvg/rsvg.h>
#include <librsvg/rsvg-cairo.h>
#include "content/content_protected.h"
#include "desktop/plotters.h"
#include "image/bitmap.h"
#include "utils/log.h"
#include "utils/utils.h"
#include "utils/messages.h"
#include "image/rsvg.h"
typedef struct rsvg_content {
struct content base;
RsvgHandle *rsvgh; /**< Context handle for RSVG renderer */
cairo_surface_t *cs; /**< The surface built inside a nsbitmap */
cairo_t *ct; /**< Cairo drawing context */
struct bitmap *bitmap; /**< Created NetSurf bitmap */
} rsvg_content;
static nserror rsvg_create_svg_data(rsvg_content *c)
{
union content_msg_data msg_data;
c->rsvgh = NULL;
c->cs = NULL;
c->ct = NULL;
c->bitmap = NULL;
if ((c->rsvgh = rsvg_handle_new()) == NULL) {
LOG(("rsvg_handle_new() returned NULL."));
msg_data.error = messages_get("NoMemory");
content_broadcast(&c->base, CONTENT_MSG_ERROR, msg_data);
return NSERROR_NOMEM;
}
return NSERROR_OK;
}
static nserror rsvg_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)
{
rsvg_content *svg;
nserror error;
svg = calloc(1, sizeof(rsvg_content));
if (svg == NULL)
return NSERROR_NOMEM;
error = content__init(&svg->base, handler, imime_type, params,
llcache, fallback_charset, quirks);
if (error != NSERROR_OK) {
free(svg);
return error;
}
error = rsvg_create_svg_data(svg);
if (error != NSERROR_OK) {
free(svg);
return error;
}
*c = (struct content *) svg;
return NSERROR_OK;
}
static bool rsvg_process_data(struct content *c, const char *data,
unsigned int size)
{
rsvg_content *d = (rsvg_content *) c;
union content_msg_data msg_data;
GError *err = NULL;
if (rsvg_handle_write(d->rsvgh, (const guchar *)data, (gsize)size,
&err) == FALSE) {
LOG(("rsvg_handle_write returned an error: %s", err->message));
msg_data.error = err->message;
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
return true;
}
/** Convert Cairo's ARGB output to NetSurf's favoured ABGR format. It converts
* the data in-place.
*
* \param pixels Pixel data, in the form of ARGB. This will
* be overwritten with new data in the form of ABGR.
* \param width Width of the bitmap
* \param height Height of the bitmap
* \param rowstride Number of bytes to skip after each row (this
* implementation requires this to be a multiple of 4.)
*/
static inline void rsvg_argb_to_abgr(uint8_t *pixels,
int width, int height, size_t rowstride)
{
uint8_t *p = pixels;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
/* Swap R and B */
const uint8_t r = p[x+3];
p[x+3] = p[x];
p[x] = r;
}
p += rowstride;
}
}
static bool rsvg_convert(struct content *c)
{
rsvg_content *d = (rsvg_content *) c;
union content_msg_data msg_data;
RsvgDimensionData rsvgsize;
GError *err = NULL;
if (rsvg_handle_close(d->rsvgh, &err) == FALSE) {
LOG(("rsvg_handle_close returned an error: %s", err->message));
msg_data.error = err->message;
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
assert(err == NULL);
/* we should now be able to query librsvg for the natural size of the
* graphic, so we can create our bitmap.
*/
rsvg_handle_get_dimensions(d->rsvgh, &rsvgsize);
c->width = rsvgsize.width;
c->height = rsvgsize.height;
if ((d->bitmap = bitmap_create(c->width, c->height,
BITMAP_NEW)) == NULL) {
LOG(("Failed to create bitmap for rsvg render."));
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
if ((d->cs = cairo_image_surface_create_for_data(
(unsigned char *)bitmap_get_buffer(d->bitmap),
CAIRO_FORMAT_ARGB32,
c->width, c->height,
bitmap_get_rowstride(d->bitmap))) == NULL) {
LOG(("Failed to create Cairo image surface for rsvg render."));
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
if ((d->ct = cairo_create(d->cs)) == NULL) {
LOG(("Failed to create Cairo drawing context for rsvg render."));
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
rsvg_handle_render_cairo(d->rsvgh, d->ct);
rsvg_argb_to_abgr(bitmap_get_buffer(d->bitmap),
c->width, c->height,
bitmap_get_rowstride(d->bitmap));
bitmap_modified(d->bitmap);
content_set_ready(c);
content_set_done(c);
/* Done: update status bar */
content_set_status(c, "");
return true;
}
static bool rsvg_redraw(struct content *c, struct content_redraw_data *data,
const struct rect *clip, const struct redraw_context *ctx)
{
rsvg_content *rsvgcontent = (rsvg_content *) c;
bitmap_flags_t flags = BITMAPF_NONE;
assert(rsvgcontent->bitmap != NULL);
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,
rsvgcontent->bitmap, data->background_colour, flags);
}
static void rsvg_destroy(struct content *c)
{
rsvg_content *d = (rsvg_content *) c;
if (d->bitmap != NULL) bitmap_destroy(d->bitmap);
if (d->rsvgh != NULL) g_object_unref(d->rsvgh);
if (d->ct != NULL) cairo_destroy(d->ct);
if (d->cs != NULL) cairo_surface_destroy(d->cs);
return;
}
static nserror rsvg_clone(const struct content *old, struct content **newc)
{
rsvg_content *svg;
nserror error;
const char *data;
unsigned long size;
svg = calloc(1, sizeof(rsvg_content));
if (svg == NULL)
return NSERROR_NOMEM;
error = content__clone(old, &svg->base);
if (error != NSERROR_OK) {
content_destroy(&svg->base);
return error;
}
/* Simply replay create/process/convert */
error = rsvg_create_svg_data(svg);
if (error != NSERROR_OK) {
content_destroy(&svg->base);
return error;
}
data = content__get_source_data(&svg->base, &size);
if (size > 0) {
if (rsvg_process_data(&svg->base, data, size) == false) {
content_destroy(&svg->base);
return NSERROR_NOMEM;
}
}
if (old->status == CONTENT_STATUS_READY ||
old->status == CONTENT_STATUS_DONE) {
if (rsvg_convert(&svg->base) == false) {
content_destroy(&svg->base);
return NSERROR_CLONE_FAILED;
}
}
*newc = (struct content *) svg;
return NSERROR_OK;
}
static void *rsvg_get_internal(const struct content *c, void *context)
{
rsvg_content *d = (rsvg_content *) c;
return d->bitmap;
}
static content_type rsvg_content_type(void)
{
return CONTENT_IMAGE;
}
static const content_handler rsvg_content_handler = {
.create = rsvg_create,
.process_data = rsvg_process_data,
.data_complete = rsvg_convert,
.destroy = rsvg_destroy,
.redraw = rsvg_redraw,
.clone = rsvg_clone,
.get_internal = rsvg_get_internal,
.type = rsvg_content_type,
.no_share = false,
};
static const char *rsvg_types[] = {
"image/svg",
"image/svg+xml"
};
CONTENT_FACTORY_REGISTER_TYPES(nsrsvg, rsvg_types, rsvg_content_handler);