mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-02 10:56:57 +03:00
17be8cf216
The netsurf core is driven from numerous operation tables most of which are now set through a common netsurf_register() interface. The font and plotting interfaces are currently separate and unlike all the other operation tables are modified for differing contexts. This change moves the font operations alongside all the other operations table and remove unnecessary interaction with the renderers font internals. Further this also removes the need for css internals to be visible in frontends.
129 lines
3.6 KiB
C
129 lines
3.6 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 "content/urldb.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 "image/bitmap.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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* \param url the URL the thumnail belongs to, or NULL
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*/
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bool thumbnail_create(hlcache_handle *content, struct bitmap *bitmap,
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nsurl *url)
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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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/* We 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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cwidth = min(content_get_width(content), 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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/* register the thumbnail with the URL */
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if (url)
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urldb_set_thumbnail(url, bitmap);
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return true;
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}
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