137 lines
3.9 KiB
C
137 lines
3.9 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 "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 "gtk/gtk_scaffolding.h"
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#include "gtk/gtk_plotters.h"
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#include "gtk/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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assert(content);
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assert(bitmap);
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cwidth = min(content_get_width(content), 1024);
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cheight = min(content_get_height(content), 768);
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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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LOG(("Trying to create a thumbnail pixmap for a content of %dx%d@%d",
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content_get_width(content), content_get_height(content),
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depth));
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pixmap = gdk_pixmap_new(NULL, cwidth, cwidth, 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 the plotting functions up */
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plot = nsgtk_plotters;
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nsgtk_plot_set_scale((double) cwidth /
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(double) content_get_width(content));
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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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plot.rectangle(0, 0, cwidth, cwidth, plot_style_fill_white);
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/* render the content */
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content_redraw(content, 0, 0, content_get_width(content),
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content_get_width(content),
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0, 0, content_get_width(content),
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content_get_width(content), 1.0, 0xFFFFFF);
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/* resample the large plot down to the size of our thumbnail */
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big = gdk_pixbuf_get_from_drawable(NULL, pixmap, NULL, 0, 0, 0, 0,
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cwidth, cwidth);
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gdk_pixbuf_scale(big, pixbuf, 0, 0, width, height, 0, 0,
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(double)width / (double)cwidth,
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(double)height / (double)cwidth,
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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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