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netsurf/framebuffer/thumbnail.c
2012-10-11 11:20:02 +01:00

100 lines
2.6 KiB
C

/*
* Copyright 2008 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/>.
*/
#include <stdbool.h>
#include <libnsfb.h>
#include <libnsfb_plot.h>
#include "utils/log.h"
#include "desktop/thumbnail.h"
#include "content/urldb.h"
#include "framebuffer/gui.h"
#include "framebuffer/fbtk.h"
#include "framebuffer/framebuffer.h"
bool
thumbnail_create(struct hlcache_handle *content,
struct bitmap *bitmap,
nsurl *url)
{
nsfb_t *tbm = (nsfb_t *)bitmap; /* target bitmap */
nsfb_t *bm; /* temporary bitmap */
nsfb_t *current; /* current main fb */
int width, height; /* target bitmap width height */
int cwidth, cheight;/* content width /height */
nsfb_bbox_t loc;
struct redraw_context ctx = {
.interactive = false,
.background_images = true,
.plot = &fb_plotters
};
nsfb_get_geometry(tbm, &width, &height, NULL);
LOG(("width %d, height %d", width, height));
/* Calculate size of buffer to render the content into */
/* We get the width from the content width, unless it exceeds 1024,
* in which case we use 1024. This means we never create excessively
* large render buffers for huge contents, which would eat memory and
* cripple performance. */
cwidth = min(content_get_width(content), 1024);
/* The height is set in proportion with the width, according to the
* aspect ratio of the required thumbnail. */
cheight = ((cwidth * height) + (width / 2)) / width;
/* create temporary surface */
bm = nsfb_new(NSFB_SURFACE_RAM);
if (bm == NULL) {
return false;
}
nsfb_set_geometry(bm, cwidth, cheight, NSFB_FMT_XBGR8888);
if (nsfb_init(bm) == -1) {
nsfb_free(bm);
return false;
}
current = framebuffer_set_surface(bm);
/* render the content into temporary surface */
thumbnail_redraw(content, cwidth, cheight, &ctx);
framebuffer_set_surface(current);
loc.x0 = 0;
loc.y0 = 0;
loc.x1 = width;
loc.y1 = height;
nsfb_plot_copy(bm, NULL, tbm, &loc);
nsfb_free(bm);
/* register the thumbnail with the URL */
if (url != NULL)
urldb_set_thumbnail(url, bitmap);
return true;
}