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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/>.
*/
/* This file contains pixbuf manipulation routines used for graphical effects like pre-lighting
and selection hilighting */
#include <config.h>
#include "eel-graphic-effects.h"
#include "eel-glib-extensions.h"
#include <math.h>
#include <string.h>
/* shared utility to create a new pixbuf from the passed-in one */
static GdkPixbuf *
create_new_pixbuf (GdkPixbuf *src)
{
g_assert (gdk_pixbuf_get_colorspace (src) == GDK_COLORSPACE_RGB);
g_assert ((!gdk_pixbuf_get_has_alpha (src)
&& gdk_pixbuf_get_n_channels (src) == 3)
|| (gdk_pixbuf_get_has_alpha (src)
&& gdk_pixbuf_get_n_channels (src) == 4));
return gdk_pixbuf_new (gdk_pixbuf_get_colorspace (src),
gdk_pixbuf_get_has_alpha (src),
gdk_pixbuf_get_bits_per_sample (src),
gdk_pixbuf_get_width (src),
gdk_pixbuf_get_height (src));
}
/* utility routine to bump the level of a color component with pinning */
static guchar
lighten_component (guchar cur_value)
{
int new_value = cur_value;
new_value += 24 + (new_value >> 3);
if (new_value > 255) {
new_value = 255;
}
return (guchar) new_value;
}
GdkPixbuf *
eel_create_spotlight_pixbuf (GdkPixbuf* src)
{
GdkPixbuf *dest;
int i, j;
int width, height, has_alpha, src_row_stride, dst_row_stride;
guchar *target_pixels, *original_pixels;
guchar *pixsrc, *pixdest;
g_return_val_if_fail (gdk_pixbuf_get_colorspace (src) == GDK_COLORSPACE_RGB, NULL);
g_return_val_if_fail ((!gdk_pixbuf_get_has_alpha (src)
&& gdk_pixbuf_get_n_channels (src) == 3)
|| (gdk_pixbuf_get_has_alpha (src)
&& gdk_pixbuf_get_n_channels (src) == 4), NULL);
g_return_val_if_fail (gdk_pixbuf_get_bits_per_sample (src) == 8, NULL);
dest = create_new_pixbuf (src);
has_alpha = gdk_pixbuf_get_has_alpha (src);
width = gdk_pixbuf_get_width (src);
height = gdk_pixbuf_get_height (src);
dst_row_stride = gdk_pixbuf_get_rowstride (dest);
src_row_stride = gdk_pixbuf_get_rowstride (src);
target_pixels = gdk_pixbuf_get_pixels (dest);
original_pixels = gdk_pixbuf_get_pixels (src);
for (i = 0; i < height; i++) {
pixdest = target_pixels + i * dst_row_stride;
pixsrc = original_pixels + i * src_row_stride;
for (j = 0; j < width; j++) {
*pixdest++ = lighten_component (*pixsrc++);
*pixdest++ = lighten_component (*pixsrc++);
*pixdest++ = lighten_component (*pixsrc++);
if (has_alpha) {
*pixdest++ = *pixsrc++;
}
}
}
return dest;
}
/* this routine colorizes the passed-in pixbuf by multiplying each pixel with the passed in color */
GdkPixbuf *
eel_create_colorized_pixbuf (GdkPixbuf *src,
GdkRGBA *color)
{
int i, j;
int width, height, has_alpha, src_row_stride, dst_row_stride;
guchar *target_pixels;
guchar *original_pixels;
guchar *pixsrc;
guchar *pixdest;
GdkPixbuf *dest;
gint red_value, green_value, blue_value;
g_return_val_if_fail (gdk_pixbuf_get_colorspace (src) == GDK_COLORSPACE_RGB, NULL);
g_return_val_if_fail ((!gdk_pixbuf_get_has_alpha (src)
&& gdk_pixbuf_get_n_channels (src) == 3)
|| (gdk_pixbuf_get_has_alpha (src)
&& gdk_pixbuf_get_n_channels (src) == 4), NULL);
g_return_val_if_fail (gdk_pixbuf_get_bits_per_sample (src) == 8, NULL);
red_value = (gint) floor (color->red * 255);
green_value = (gint) floor (color->green * 255);
blue_value = (gint) floor (color->blue * 255);
dest = create_new_pixbuf (src);
has_alpha = gdk_pixbuf_get_has_alpha (src);
width = gdk_pixbuf_get_width (src);
height = gdk_pixbuf_get_height (src);
src_row_stride = gdk_pixbuf_get_rowstride (src);
dst_row_stride = gdk_pixbuf_get_rowstride (dest);
target_pixels = gdk_pixbuf_get_pixels (dest);
original_pixels = gdk_pixbuf_get_pixels (src);
for (i = 0; i < height; i++) {
pixdest = target_pixels + i*dst_row_stride;
pixsrc = original_pixels + i*src_row_stride;
for (j = 0; j < width; j++) {
*pixdest++ = (*pixsrc++ * red_value) >> 8;
*pixdest++ = (*pixsrc++ * green_value) >> 8;
*pixdest++ = (*pixsrc++ * blue_value) >> 8;
if (has_alpha) {
*pixdest++ = *pixsrc++;
}
}
}
return dest;
}
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