netsurf/windows/thumbnail.c

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/*
* Copyright 2009 Mark Benjamin <netsurf-browser.org.MarkBenjamin@dfgh.net>
*
* 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/>.
*/
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#include "utils/config.h"
#include <windows.h>
#include "content/urldb.h"
#include "desktop/browser.h"
#include "desktop/thumbnail.h"
#include "utils/log.h"
#include "image/bitmap.h"
#include "windows/bitmap.h"
#include "windows/gui.h"
#include "windows/plot.h"
#include "content/hlcache.h"
bool
thumbnail_create(hlcache_handle *content,
struct bitmap *bitmap,
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nsurl *url)
{
int width;
int height;
HDC hdc, bufferdc, minidc;
struct redraw_context ctx = {
.interactive = false,
.background_images = true,
.plot = &win_plotters
};
struct bitmap *fsbitmap;
width = min(content_get_width(content), 1024);
height = ((width * bitmap->height) + (bitmap->width / 2)) /
bitmap->width;
LOG(("bitmap %p for url %s content %p width %d, height %d",
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bitmap, nsurl_access(url), content, width, height));
/* create two memory device contexts to put the bitmaps in */
bufferdc = CreateCompatibleDC(NULL);
if ((bufferdc == NULL)) {
return false;
}
minidc = CreateCompatibleDC(NULL);
if ((minidc == NULL)) {
DeleteDC(bufferdc);
return false;
}
/* create a full size bitmap and plot into it */
fsbitmap = bitmap_create(width, height, BITMAP_NEW | BITMAP_CLEAR_MEMORY | BITMAP_OPAQUE | BITMAP_PERSISTENT);
SelectObject(bufferdc, fsbitmap->windib);
hdc = plot_hdc;
plot_hdc = bufferdc;
thumbnail_redraw(content, width, height, &ctx);
plot_hdc = hdc;
/* scale bitmap bufferbm into minibm */
SelectObject(minidc, bitmap->windib);
bitmap->opaque = true;
StretchBlt(minidc, 0, 0, bitmap->width, bitmap->height, bufferdc, 0, 0, width, height, SRCCOPY);
DeleteDC(bufferdc);
DeleteDC(minidc);
bitmap_destroy(fsbitmap);
if (url)
urldb_set_thumbnail(url, bitmap);
return true;
}