mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-24 07:19:37 +03:00
142 lines
4.1 KiB
C
142 lines
4.1 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 "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 "gtk/scaffolding.h"
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#include "gtk/plotters.h"
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#include "gtk/bitmap.h"
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#include "image/bitmap.h"
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#include "render/font.h"
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#include "utils/log.h"
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#include "utils/utils.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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const char *url)
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{
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GdkPixbuf *pixbuf;
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int cwidth, cheight;
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gint width;
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gint height;
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gint depth;
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GdkPixmap *pixmap;
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GdkPixbuf *big;
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double scale;
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struct redraw_context ctx = {
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.interactive = false,
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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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/* Get details of required final thumbnail image */
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pixbuf = gtk_bitmap_get_primary(bitmap);
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width = gdk_pixbuf_get_width(pixbuf);
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height = gdk_pixbuf_get_height(pixbuf);
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depth = (gdk_screen_get_system_visual(gdk_screen_get_default()))->depth;
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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 * height) + (width / 2)) / width;
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/* Create buffer to render into */
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pixmap = gdk_pixmap_new(NULL, cwidth, cheight, depth);
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if (pixmap == NULL) {
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/* the creation failed for some reason: most likely because
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* we've been asked to create with with at least one dimention
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* as zero. The RISC OS thumbnail generator returns false
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* from here when it can't create a bitmap, so we assume it's
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* safe to do so here too.
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*/
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return false;
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}
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gdk_drawable_set_colormap(pixmap, gdk_colormap_get_system());
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/* set to plot to pixmap */
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current_drawable = pixmap;
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current_gc = gdk_gc_new(current_drawable);
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#ifdef CAIRO_VERSION
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current_cr = gdk_cairo_create(current_drawable);
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#endif
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/* render the content */
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thumbnail_redraw(content, cwidth, cheight, &ctx);
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/* get the pixbuf we rendered the content into */
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big = gdk_pixbuf_get_from_drawable(NULL, pixmap, NULL, 0, 0, 0, 0,
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cwidth, cheight);
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/* resample the large plot down to the size of our thumbnail */
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scale = (double)width / (double)cwidth;
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gdk_pixbuf_scale(big, pixbuf, 0, 0, width, height, 0, 0,
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scale, scale, GDK_INTERP_TILES);
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/* As a debugging aid, try this to dump out a copy of the thumbnail as
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* a PNG: gdk_pixbuf_save(pixbuf, "thumbnail.png", "png", NULL, NULL);
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*/
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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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bitmap_modified(bitmap);
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g_object_unref(current_gc);
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#ifdef CAIRO_VERSION
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cairo_destroy(current_cr);
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#endif
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g_object_unref(pixmap);
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g_object_unref(big);
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return true;
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}
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