netsurf/image/rsvg.c

211 lines
6.0 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 "utils/config.h"
#ifdef WITH_RSVG
#include <stdbool.h>
#include <assert.h>
#include <sys/types.h>
#include <librsvg/rsvg.h>
#include <librsvg/rsvg-cairo.h>
#include "image/rsvg.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 "utils/talloc.h"
static inline void rsvg_argb_to_abgr(uint32_t pixels[], int width, int height,
size_t rowstride);
bool rsvg_create(struct content *c, const struct http_parameter *params)
{
struct content_rsvg_data *d = &c->data.rsvg;
union content_msg_data msg_data;
d->rsvgh = NULL;
d->cs = NULL;
d->ct = NULL;
d->bitmap = NULL;
if ((d->rsvgh = rsvg_handle_new()) == NULL) {
LOG(("rsvg_handle_new() returned NULL."));
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
return true;
}
bool rsvg_process_data(struct content *c, char *data,
unsigned int size)
{
struct content_rsvg_data *d = &c->data.rsvg;
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. Operation is endian-swap and rotate right 8 bits.
*
* \param pixels Array of 32-bit values, 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(uint32_t pixels[], int width, int height,
size_t rowstride)
{
uint32_t *p = &pixels[0];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
uint32_t e = p[x];
uint32_t s = (((e & 0xff) << 24) |
((e & 0xff00) << 8) |
((e & 0xff0000) >> 8) |
((e & 0xff000000) >> 24));
p[x] = (s >> 8) | (s << 24);
}
p += (rowstride >> 2);
}
}
bool rsvg_convert(struct content *c)
{
struct content_rsvg_data *d = &c->data.rsvg;
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((uint32_t *)bitmap_get_buffer(d->bitmap),
c->width, c->height,
bitmap_get_rowstride(d->bitmap));
c->bitmap = d->bitmap;
bitmap_modified(c->bitmap);
c->status = CONTENT_STATUS_DONE;
/* Done: update status bar */
content_set_status(c, "");
return true;
}
bool rsvg_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, colour background_colour)
{
plot.bitmap(x, y, width, height, c->bitmap, background_colour, BITMAPF_NONE);
return true;
}
bool rsvg_redraw_tiled(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, colour background_colour,
bool repeat_x, bool repeat_y)
{
return true;
}
void rsvg_destroy(struct content *c)
{
struct content_rsvg_data *d = &c->data.rsvg;
if (d->bitmap != NULL) bitmap_destroy(d->bitmap);
if (d->rsvgh != NULL) rsvg_handle_free(d->rsvgh);
if (d->ct != NULL) cairo_destroy(d->ct);
if (d->cs != NULL) cairo_surface_destroy(d->cs);
return;
}
#endif /* WITH_RSVG */