126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
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* Copyright 2011 Vincent Sanders <vince@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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#include <string.h>
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#include "utils/log.h"
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#include "gtk/gdk.h"
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static void
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convert_alpha(guchar *dest_data,
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int dest_stride,
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guchar *src_data,
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int src_stride,
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int width,
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int height)
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{
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int x, y;
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for (y = 0; y < height; y++) {
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/* this cast is safe, the buffer is appropriately aligned */
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guint32 *src = (void *) src_data;
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for (x = 0; x < width; x++) {
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guint alpha = src[x] >> 24;
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if (alpha == 0) {
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dest_data[x * 4 + 0] = 0;
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dest_data[x * 4 + 1] = 0;
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dest_data[x * 4 + 2] = 0;
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} else {
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dest_data[x * 4 + 0] = (((src[x] & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
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dest_data[x * 4 + 1] = (((src[x] & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
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dest_data[x * 4 + 2] = (((src[x] & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
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}
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dest_data[x * 4 + 3] = alpha;
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}
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src_data += src_stride;
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dest_data += dest_stride;
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}
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}
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GdkPixbuf *
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nsgdk_pixbuf_get_from_surface(cairo_surface_t *surface, int scwidth, int scheight)
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{
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int width, height; /* source width and height */
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cairo_surface_t *scsurface; /* scaled surface */
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cairo_t *cr; /* cairo context for scaled surface */
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GdkPixbuf *pixbuf; /* The result pixel buffer */
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/* create pixmap */
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pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8, scwidth, scheight);
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if (pixbuf == NULL) {
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return NULL;
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}
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memset(gdk_pixbuf_get_pixels(pixbuf),
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0xff,
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gdk_pixbuf_get_rowstride(pixbuf) * scheight);
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/* scale cairo surface into new surface the target size */
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cairo_surface_flush(surface); /* ensure source surface is ready */
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/* get source surface dimensions */
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width = cairo_image_surface_get_width(surface);
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height = cairo_image_surface_get_height(surface);
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/* scaled surface always has an alpha chanel for ease */
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scsurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, scwidth, scheight);
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if (cairo_surface_status(scsurface) != CAIRO_STATUS_SUCCESS) {
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cairo_surface_destroy(scsurface);
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g_object_unref(pixbuf);
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NSLOG(netsurf, INFO, "Surface creation failed");
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return NULL;
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}
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cr = cairo_create(scsurface);
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/* Scale *before* setting the source surface */
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cairo_scale(cr, (double)scwidth / width, (double)scheight / height);
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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
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* alpha, which would occur with the default
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* EXTEND_NONE. Use EXTEND_PAD for 1.2 or newer
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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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/* copy data from surface into pixmap */
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convert_alpha(gdk_pixbuf_get_pixels(pixbuf),
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gdk_pixbuf_get_rowstride(pixbuf),
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cairo_image_surface_get_data(scsurface),
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cairo_image_surface_get_stride(scsurface),
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scwidth, scheight);
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cairo_surface_destroy(scsurface);
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return pixbuf;
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}
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