* Cody Russell <bratsche@dfw.net>
*
* This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
+ * modify it under the terms of the GNU Lesser 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.
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
+ * You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
1.0, 1.0,
GDK_INTERP_NEAREST);
}
+
+
+
+#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
+
+/**
+ * gdk_pixbuf_saturate_and_pixelate:
+ * @src: source image
+ * @dest: place to write modified version of @src
+ * @saturation: saturation factor
+ * @pixelate: whether to pixelate
+ *
+ * Modifies saturation and optionally pixelates @src, placing the
+ * result in @dest. @src and @dest may be the same pixbuf with no ill
+ * effects. If @saturation is 1.0 then saturation is not changed. If
+ * it's less than 1.0, saturation is reduced (the image is darkened);
+ * if greater than 1.0, saturation is increased (the image is
+ * brightened). If @pixelate is TRUE, then pixels are faded in a
+ * checkerboard pattern to create a pixelated image. @src and @dest
+ * must have the same image format, size, and rowstride.
+ *
+ **/
+void
+gdk_pixbuf_saturate_and_pixelate(const GdkPixbuf *src,
+ GdkPixbuf *dest,
+ gfloat saturation,
+ gboolean pixelate)
+{
+ /* NOTE that src and dest MAY be the same pixbuf! */
+
+ g_return_if_fail (GDK_IS_PIXBUF (src));
+ g_return_if_fail (GDK_IS_PIXBUF (dest));
+ g_return_if_fail (gdk_pixbuf_get_height (src) == gdk_pixbuf_get_height (dest));
+ g_return_if_fail (gdk_pixbuf_get_width (src) == gdk_pixbuf_get_width (dest));
+ g_return_if_fail (gdk_pixbuf_get_rowstride (src) == gdk_pixbuf_get_rowstride (dest));
+ g_return_if_fail (gdk_pixbuf_get_colorspace (src) == gdk_pixbuf_get_colorspace (dest));
+
+ if (saturation == 1.0 && !pixelate) {
+ if (dest != src)
+ memcpy (gdk_pixbuf_get_pixels (dest),
+ gdk_pixbuf_get_pixels (src),
+ gdk_pixbuf_get_height (src) * gdk_pixbuf_get_rowstride (src));
+
+ return;
+ } else {
+ gint i, j;
+ gint width, height, has_alpha, rowstride;
+ guchar *target_pixels;
+ guchar *original_pixels;
+ guchar *current_pixel;
+ guchar intensity;
+
+ has_alpha = gdk_pixbuf_get_has_alpha (src);
+ width = gdk_pixbuf_get_width (src);
+ height = gdk_pixbuf_get_height (src);
+ rowstride = 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++) {
+ for (j = 0; j < width; j++) {
+ current_pixel = original_pixels + i*rowstride + j*(has_alpha?4:3);
+ intensity = INTENSITY (*(current_pixel), *(current_pixel + 1), *(current_pixel + 2));
+ if (pixelate && (i+j)%2 == 0) {
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3)) = intensity/2 + 127;
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3) + 1) = intensity/2 + 127;
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3) + 2) = intensity/2 + 127;
+ } else if (pixelate) {
+#define DARK_FACTOR 0.7
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3)) =
+ (guchar) (((1.0 - saturation) * intensity
+ + saturation * (*(current_pixel)))) * DARK_FACTOR;
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3) + 1) =
+ (guchar) (((1.0 - saturation) * intensity
+ + saturation * (*(current_pixel + 1)))) * DARK_FACTOR;
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3) + 2) =
+ (guchar) (((1.0 - saturation) * intensity
+ + saturation * (*(current_pixel + 2)))) * DARK_FACTOR;
+ } else {
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3)) =
+ (guchar) ((1.0 - saturation) * intensity
+ + saturation * (*(current_pixel)));
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3) + 1) =
+ (guchar) ((1.0 - saturation) * intensity
+ + saturation * (*(current_pixel + 1)));
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3) + 2) =
+ (guchar) ((1.0 - saturation) * intensity
+ + saturation * (*(current_pixel + 2)));
+ }
+
+ if (has_alpha)
+ *(target_pixels + i*rowstride + j*(has_alpha?4:3) + 3) = *(current_pixel + 3);
+ }
+ }
+
+ return;
+ }
+}
projects / ~andy / gtk / blobdiff