mirror of
https://github.com/netsurf-browser/netsurf
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107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* Copyright 2011 Michael Drake <tlsa@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* Core thumbnail handling (implementation).
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*/
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#include <assert.h>
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#include <stdbool.h>
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#include "content/content.h"
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#include "content/hlcache.h"
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#include "desktop/browser.h"
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#include "desktop/knockout.h"
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#include "desktop/options.h"
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#include "desktop/plotters.h"
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#include "desktop/thumbnail.h"
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#include "utils/log.h"
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/**
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* Get scale at which thumbnail will be rendered for a given content and
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* thumbnail size.
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*
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* \param content The content to redraw for thumbnail
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* \param width The thumbnail width
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* \return scale thumbnail will be rendered at
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*
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* Units for width and height are pixels.
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*/
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static float thumbnail_get_redraw_scale(struct hlcache_handle *content,
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int width)
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{
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assert(content);
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if (content_get_width(content))
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return (float)width / (float)content_get_width(content);
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else
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return 1.0;
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}
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/* exported interface, documented in thumbnail.h */
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bool thumbnail_redraw(struct hlcache_handle *content,
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int width, int height, const struct redraw_context *ctx)
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{
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struct redraw_context new_ctx = *ctx;
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struct rect clip;
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struct content_redraw_data data;
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float scale;
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bool plot_ok = true;
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assert(content);
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if (ctx->plot->option_knockout)
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knockout_plot_start(ctx, &new_ctx);
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/* Set clip rectangle to required thumbnail size */
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clip.x0 = 0;
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clip.y0 = 0;
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clip.x1 = width;
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clip.y1 = height;
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new_ctx.plot->clip(&clip);
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/* Plot white background */
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plot_ok &= new_ctx.plot->rectangle(clip.x0, clip.y0, clip.x1, clip.y1,
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plot_style_fill_white);
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/* Find the scale we're using */
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scale = thumbnail_get_redraw_scale(content, width);
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/* Set up content redraw data */
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data.x = 0;
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data.y = 0;
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data.width = width;
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data.height = height;
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data.background_colour = 0xFFFFFF;
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data.scale = scale;
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data.repeat_x = false;
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data.repeat_y = false;
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/* Render the content */
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plot_ok &= content_redraw(content, &data, &clip, &new_ctx);
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if (ctx->plot->option_knockout)
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knockout_plot_end();
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return plot_ok;
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}
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