mirror of
https://github.com/netsurf-browser/netsurf
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123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/*
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* Copyright 2006 Rob Kendrick <rjek@rjek.com>
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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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* Page thumbnail creation (implementation).
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*
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* Thumbnails are created by setting the current drawing contexts to the
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* bitmap (a gdk pixbuf) we are passed, and plotting the page at a small
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* scale.
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*/
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#include <assert.h>
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#include <gtk/gtk.h>
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#include <gdk/gdk.h>
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#include "utils/log.h"
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#include "utils/utils.h"
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#include "content/content.h"
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#include "content/hlcache.h"
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#include "desktop/plotters.h"
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#include "desktop/browser.h"
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#include "desktop/thumbnail.h"
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#include "gtk/scaffolding.h"
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#include "gtk/plotters.h"
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#include "gtk/bitmap.h"
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/**
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* Create a thumbnail of a page.
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*
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* \param content content structure to thumbnail
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* \param bitmap the bitmap to draw to
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* \return true on success and bitmap updated else false
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*/
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bool thumbnail_create(hlcache_handle *content, struct bitmap *bitmap)
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{
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cairo_surface_t *dsurface = bitmap->surface;
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cairo_surface_t *surface;
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cairo_t *old_cr;
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gint dwidth, dheight;
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int cwidth, cheight;
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struct redraw_context ctx = {
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.interactive = false,
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.background_images = true,
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.plot = &nsgtk_plotters
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};
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assert(content);
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assert(bitmap);
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dwidth = cairo_image_surface_get_width(dsurface);
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dheight = cairo_image_surface_get_height(dsurface);
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/* Calculate size of buffer to render the content into */
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/* Get the width from the content width, unless it exceeds 1024,
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* in which case we use 1024. This means we never create excessively
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* large render buffers for huge contents, which would eat memory and
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* cripple performance.
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*/
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cwidth = min(max(content_get_width(content), dwidth), 1024);
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/* The height is set in proportion with the width, according to the
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* aspect ratio of the required thumbnail. */
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cheight = ((cwidth * dheight) + (dwidth / 2)) / dwidth;
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/* Create surface to render into */
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surface = cairo_surface_create_similar(dsurface, CAIRO_CONTENT_COLOR_ALPHA, cwidth, cheight);
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if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
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cairo_surface_destroy(surface);
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return false;
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}
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old_cr = current_cr;
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current_cr = cairo_create(surface);
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/* render the content */
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thumbnail_redraw(content, cwidth, cheight, &ctx);
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cairo_destroy(current_cr);
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current_cr = old_cr;
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cairo_t *cr = cairo_create(dsurface);
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/* Scale *before* setting the source surface (1) */
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cairo_scale (cr, (double)dwidth / cwidth, (double)dheight / cheight);
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cairo_set_source_surface (cr, surface, 0, 0);
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/* To avoid getting the edge pixels blended with 0 alpha,
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* which would occur with the default EXTEND_NONE. Use
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* EXTEND_PAD for 1.2 or newer (2)
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*/
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cairo_pattern_set_extend (cairo_get_source(cr), CAIRO_EXTEND_REFLECT);
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/* Replace the destination with the source instead of overlaying */
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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/* Do the actual drawing */
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cairo_paint(cr);
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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return true;
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}
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