Implement the (second) suggested effect for insensitive icons.

3 files changed, 132 insertions, 0 deletions

diff --git a/gtk/engine/Makefile.am b/gtk/engine/Makefile.am
index 34bd007..eb720ff 100644
--- a/gtk/engine/Makefile.am
+++ b/gtk/engine/Makefile.am
@@ -15,6 +15,8 @@ libsugar_la_SOURCES =		\
 	sugar-style.c		\
 	sugar-info.h		\
 	sugar-info.c		\
+	sugar-utils.h		\
+	sugar-utils.c		\
 	sugar-drawing.h		\
 	sugar-drawing.c
 
diff --git a/gtk/engine/sugar-utils.c b/gtk/engine/sugar-utils.c
new file mode 100644
index 0000000..776b1ef
--- /dev/null
+++ b/gtk/engine/sugar-utils.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2007, Benjamin Berg
+ *
+ * This library is free software; you can redistribute it and/or
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * 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.
+ */
+
+#include "sugar-utils.h"
+
+GdkPixbuf*
+sugar_pixbuf_scale_or_ref (GdkPixbuf *pixbuf,
+                           gint       width,
+                           gint       height)
+{
+    gint pixbuf_width = gdk_pixbuf_get_width (pixbuf);
+    gint pixbuf_height = gdk_pixbuf_get_height (pixbuf);
+
+    if ((pixbuf_width != width) || (pixbuf_height != height)) {
+        return gdk_pixbuf_scale_simple (pixbuf, width, height, GDK_INTERP_BILINEAR);
+    } else {
+        g_object_ref (pixbuf);
+        return pixbuf;
+    }
+}
+
+#define RED 0
+#define GREEN 1
+#define BLUE 2
+#define ALPHA 3
+
+GdkPixbuf*
+sugar_get_insensitive_icon (GdkPixbuf *icon,
+                            guint      range,
+                            guint      base)
+{
+    GdkPixbuf *result = gdk_pixbuf_copy (icon);
+    guint x, y, rowstride, height, width;
+    guint n_channels;
+    guint8 *pixel, *pixels;
+    guint min_color_value = G_MAXUINT8;
+    guint max_color_value = 0;
+    guint mult;
+    gboolean has_alpha;
+
+    width = gdk_pixbuf_get_width (result);
+    height = gdk_pixbuf_get_height (result);
+    rowstride = gdk_pixbuf_get_rowstride (result);
+    n_channels = gdk_pixbuf_get_n_channels (result);
+    pixels = gdk_pixbuf_get_pixels (result);
+
+    for (y = 0; y < height; y++) {
+        pixel = pixels + y*rowstride;
+        for (x = 0; x < width; x++) {
+            if (n_channels == 4 && pixel[ALPHA] == 0) {
+                pixel += n_channels;
+                continue;
+            }
+
+            min_color_value = MIN (min_color_value, pixel[RED]);
+            max_color_value = MAX (max_color_value, pixel[RED]);
+
+            min_color_value = MIN (min_color_value, pixel[GREEN]);
+            max_color_value = MAX (max_color_value, pixel[GREEN]);
+
+            min_color_value = MIN (min_color_value, pixel[BLUE]);
+            max_color_value = MAX (max_color_value, pixel[BLUE]);
+
+            pixel += n_channels;
+        }
+    }
+
+    /* Shift the base value, to whatever we really need to adjust to. */
+    base = base - range / 2;
+    mult = (range << 8) / (max_color_value - min_color_value);
+
+    for (y = 0; y < height; y++) {
+        pixel = pixels + y*rowstride;
+        for (x = 0; x < width; x++) {
+            pixel[RED] = ((((guint) (pixel[RED] - min_color_value)) * mult) >> 8) + base;
+            pixel[GREEN] = ((((guint) (pixel[GREEN] - min_color_value)) * mult) >> 8) + base;
+            pixel[BLUE] = ((((guint) (pixel[BLUE] - min_color_value)) * mult) >> 8) + base;
+
+            pixel += n_channels;
+        }
+    }
+
+    return result;
+}
+
+#undef RED
+#undef GREEN
+#undef BLUE
+#undef ALPHA
+
diff --git a/gtk/engine/sugar-utils.h b/gtk/engine/sugar-utils.h
new file mode 100644
index 0000000..d80a389
--- /dev/null
+++ b/gtk/engine/sugar-utils.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2007, Benjamin Berg
+ *
+ * This library is free software; you can redistribute it and/or
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * 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.
+ */
+
+#include <gdk/gdk.h>
+
+G_GNUC_INTERNAL GdkPixbuf* sugar_pixbuf_scale_or_ref (GdkPixbuf *pixbuf, gint width, gint height);
+G_GNUC_INTERNAL GdkPixbuf* sugar_get_insensitive_icon (GdkPixbuf *icon, guint range, guint base);
+