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/* Eel - pixbuf manipulation routines for graphical effects.
*
* Copyright (C) 2000 Eazel, Inc
*
* Author: Andy Hertzfeld <andy@eazel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "eel-graphic-effects.h"
GdkTexture *
eel_create_spotlight_texture (GdkTexture *texture)
{
int width;
int height;
cairo_surface_t *surface;
cairo_t *cr;
unsigned char *data;
int stride;
g_autoptr (GBytes) bytes = NULL;
GdkTexture *prelit_texture;
g_return_val_if_fail (GDK_IS_TEXTURE (texture), NULL);
width = gdk_texture_get_width (texture);
height = gdk_texture_get_height (texture);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
cr = cairo_create (surface);
data = cairo_image_surface_get_data (surface);
stride = cairo_image_surface_get_stride (surface);
gdk_texture_download (texture, data, stride);
cairo_surface_mark_dirty (surface);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
cairo_push_group (cr);
/* This is *close enough* to the original look.
* The magic alpha value was selected after visual comparison.
*/
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.18);
cairo_paint (cr);
cairo_pop_group_to_source (cr);
cairo_mask_surface (cr, surface, 0.0, 0.0);
cairo_surface_flush (surface);
bytes = g_bytes_new (data, height * stride);
prelit_texture = gdk_memory_texture_new (width, height, GDK_MEMORY_B8G8R8A8_PREMULTIPLIED, bytes, stride);
cairo_destroy (cr);
cairo_surface_destroy (surface);
return prelit_texture;
}
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