mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-25 07:49:38 +03:00
6f4f860ce3
More debugging of thumbnail creation as it appears to be involved in a number of recently reported crashes on RISC OS.
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
|
|
* Copyright 2011 Michael Drake <tlsa@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
|
|
* Core thumbnail handling (implementation).
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "content/content.h"
|
|
#include "content/hlcache.h"
|
|
#include "desktop/browser.h"
|
|
#include "desktop/knockout.h"
|
|
#include "utils/nsoption.h"
|
|
#include "desktop/plotters.h"
|
|
#include "desktop/thumbnail.h"
|
|
#include "utils/log.h"
|
|
|
|
|
|
/**
|
|
* Get scale at which thumbnail will be rendered for a given content and
|
|
* thumbnail size.
|
|
*
|
|
* \param content The content to redraw for thumbnail
|
|
* \param width The thumbnail width
|
|
* \return scale thumbnail will be rendered at
|
|
*
|
|
* Units for width and height are pixels.
|
|
*/
|
|
static float thumbnail_get_redraw_scale(struct hlcache_handle *content,
|
|
int width)
|
|
{
|
|
assert(content);
|
|
|
|
if (content_get_width(content))
|
|
return (float)width / (float)content_get_width(content);
|
|
else
|
|
return 1.0;
|
|
}
|
|
|
|
|
|
/* exported interface, documented in thumbnail.h */
|
|
bool thumbnail_redraw(struct hlcache_handle *content,
|
|
int width, int height, const struct redraw_context *ctx)
|
|
{
|
|
struct redraw_context new_ctx = *ctx;
|
|
struct rect clip;
|
|
struct content_redraw_data data;
|
|
float scale;
|
|
bool plot_ok = true;
|
|
|
|
assert(content);
|
|
|
|
LOG(("Content %p %dx%d ctx:%p", content, width, height, ctx));
|
|
|
|
if (ctx->plot->option_knockout) {
|
|
knockout_plot_start(ctx, &new_ctx);
|
|
}
|
|
|
|
/* Set clip rectangle to required thumbnail size */
|
|
clip.x0 = 0;
|
|
clip.y0 = 0;
|
|
clip.x1 = width;
|
|
clip.y1 = height;
|
|
|
|
new_ctx.plot->clip(&clip);
|
|
|
|
/* Plot white background */
|
|
plot_ok &= new_ctx.plot->rectangle(clip.x0, clip.y0, clip.x1, clip.y1,
|
|
plot_style_fill_white);
|
|
|
|
/* Find the scale we're using */
|
|
scale = thumbnail_get_redraw_scale(content, width);
|
|
|
|
/* Set up content redraw data */
|
|
data.x = 0;
|
|
data.y = 0;
|
|
data.width = width;
|
|
data.height = height;
|
|
|
|
data.background_colour = 0xFFFFFF;
|
|
data.scale = scale;
|
|
data.repeat_x = false;
|
|
data.repeat_y = false;
|
|
|
|
/* Render the content */
|
|
plot_ok &= content_redraw(content, &data, &clip, &new_ctx);
|
|
|
|
if (ctx->plot->option_knockout) {
|
|
knockout_plot_end();
|
|
}
|
|
|
|
return plot_ok;
|
|
}
|