moving from https://github.com/perberos/mate-desktop-environment

1 files changed, 1510 insertions, 0 deletions

diff --git a/eel/eel-gdk-pixbuf-extensions.c b/eel/eel-gdk-pixbuf-extensions.c
new file mode 100644
index 00000000..a58ef4c5
--- /dev/null
+++ b/eel/eel-gdk-pixbuf-extensions.c
@@ -0,0 +1,1510 @@
+/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+
+/* eel-gdk-pixbuf-extensions.c: Routines to augment what's in gdk-pixbuf.
+
+   Copyright (C) 2000 Eazel, Inc.
+
+   The Mate 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.
+
+   The Mate 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 the Mate Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+
+   Authors: Darin Adler <[email protected]>
+            Ramiro Estrugo <[email protected]>
+*/
+
+#include <config.h>
+#include "eel-gdk-pixbuf-extensions.h"
+
+#include "eel-art-gtk-extensions.h"
+#include "eel-debug-drawing.h"
+#include "eel-debug.h"
+#include "eel-gdk-extensions.h"
+#include "eel-glib-extensions.h"
+#include "eel-graphic-effects.h"
+#include "eel-lib-self-check-functions.h"
+#include "eel-string.h"
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gdk/gdkprivate.h>
+#include <gdk/gdkx.h>
+#include <gio/gio.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define LOAD_BUFFER_SIZE 65536
+
+const EelIRect eel_gdk_pixbuf_whole_pixbuf = { G_MININT, G_MININT, G_MAXINT, G_MAXINT };
+
+struct EelPixbufLoadHandle
+{
+    GCancellable *cancellable;
+    GInputStream *stream;
+    EelPixbufLoadCallback callback;
+    gpointer callback_data;
+    GdkPixbufLoader *loader;
+    char buffer[LOAD_BUFFER_SIZE];
+};
+
+/**
+ * eel_gdk_pixbuf_list_ref
+ * @pixbuf_list: A list of GdkPixbuf objects.
+ *
+ * Refs all the pixbufs.
+ **/
+void
+eel_gdk_pixbuf_list_ref (GList *pixbuf_list)
+{
+    g_list_foreach (pixbuf_list, (GFunc) g_object_ref, NULL);
+}
+
+/**
+ * eel_gdk_pixbuf_list_free
+ * @pixbuf_list: A list of GdkPixbuf objects.
+ *
+ * Unrefs all the pixbufs, then frees the list.
+ **/
+void
+eel_gdk_pixbuf_list_free (GList *pixbuf_list)
+{
+    eel_g_list_free_deep_custom (pixbuf_list, (GFunc) g_object_unref, NULL);
+}
+
+GdkPixbuf *
+eel_gdk_pixbuf_load (const char *uri)
+{
+    GdkPixbuf *pixbuf;
+    GFile *file;
+    GFileInputStream *stream;
+
+    g_return_val_if_fail (uri != NULL, NULL);
+
+    file = g_file_new_for_uri (uri);
+
+    stream = g_file_read (file, NULL, NULL);
+
+    g_object_unref (file);
+
+    if (stream == NULL)
+    {
+        return NULL;
+    }
+
+    pixbuf = eel_gdk_pixbuf_load_from_stream (G_INPUT_STREAM (stream));
+
+    g_object_unref (stream);
+
+    return pixbuf;
+}
+
+GdkPixbuf *
+eel_gdk_pixbuf_load_from_stream (GInputStream  *stream)
+{
+    return eel_gdk_pixbuf_load_from_stream_at_size (stream, -1);
+}
+
+static void
+pixbuf_loader_size_prepared (GdkPixbufLoader *loader,
+                             int              width,
+                             int              height,
+                             gpointer         desired_size_ptr)
+{
+    int size, desired_size;
+    float scale;
+
+    size = MAX (width, height);
+    desired_size = GPOINTER_TO_INT (desired_size_ptr);
+
+    if (size != desired_size)
+    {
+        scale = (float) desired_size / size;
+        gdk_pixbuf_loader_set_size (loader,
+                                    floor (scale * width + 0.5),
+                                    floor (scale * height + 0.5));
+    }
+}
+
+GdkPixbuf *
+eel_gdk_pixbuf_load_from_stream_at_size (GInputStream  *stream,
+        int            size)
+{
+    char buffer[LOAD_BUFFER_SIZE];
+    gssize bytes_read;
+    GdkPixbufLoader *loader;
+    GdkPixbuf *pixbuf;
+    gboolean got_eos;
+
+
+    g_return_val_if_fail (stream != NULL, NULL);
+
+    got_eos = FALSE;
+    loader = gdk_pixbuf_loader_new ();
+
+    if (size > 0)
+    {
+        g_signal_connect (loader, "size-prepared",
+                          G_CALLBACK (pixbuf_loader_size_prepared),
+                          GINT_TO_POINTER (size));
+    }
+
+    while (1)
+    {
+        bytes_read = g_input_stream_read (stream, buffer, sizeof (buffer),
+                                          NULL, NULL);
+
+        if (bytes_read < 0)
+        {
+            break;
+        }
+        if (bytes_read == 0)
+        {
+            got_eos = TRUE;
+            break;
+        }
+        if (!gdk_pixbuf_loader_write (loader,
+                                      buffer,
+                                      bytes_read,
+                                      NULL))
+        {
+            break;
+        }
+    }
+
+    g_input_stream_close (stream, NULL, NULL);
+    gdk_pixbuf_loader_close (loader, NULL);
+
+    pixbuf = NULL;
+    if (got_eos)
+    {
+        pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
+        if (pixbuf != NULL)
+        {
+            g_object_ref (pixbuf);
+        }
+    }
+
+    g_object_unref (loader);
+
+    return pixbuf;
+}
+
+static void
+free_pixbuf_load_handle (EelPixbufLoadHandle *handle)
+{
+    g_object_unref (handle->cancellable);
+    if (handle->loader != NULL)
+    {
+        g_object_unref (handle->loader);
+    }
+    if (handle->stream)
+    {
+        g_input_stream_close_async (handle->stream, 0, NULL, NULL, NULL);
+        g_object_unref (handle->stream);
+    }
+    g_free (handle);
+}
+
+static void
+load_done (EelPixbufLoadHandle *handle, GError *error, gboolean get_pixbuf)
+{
+    GdkPixbuf *pixbuf;
+
+    if (handle->loader != NULL)
+    {
+        gdk_pixbuf_loader_close (handle->loader, NULL);
+    }
+
+    pixbuf = get_pixbuf ? gdk_pixbuf_loader_get_pixbuf (handle->loader) : NULL;
+
+    handle->callback (error, pixbuf, handle->callback_data);
+
+    free_pixbuf_load_handle (handle);
+}
+
+static void
+file_read_callback (GObject *source_object,
+                    GAsyncResult *res,
+                    gpointer user_data)
+{
+    EelPixbufLoadHandle *handle;
+    gssize bytes_read;
+    GError *error;
+
+    handle = user_data;
+
+    if (g_cancellable_is_cancelled (handle->cancellable))
+    {
+        free_pixbuf_load_handle (handle);
+        return;
+    }
+
+    error = NULL;
+    bytes_read = g_input_stream_read_finish  (G_INPUT_STREAM (source_object),
+                 res, &error);
+
+    if (bytes_read > 0)
+    {
+        if (!gdk_pixbuf_loader_write (handle->loader,
+                                      handle->buffer,
+                                      bytes_read,
+                                      &error))
+        {
+            bytes_read = -1;
+        }
+        else
+        {
+            g_input_stream_read_async (handle->stream,
+                                       handle->buffer,
+                                       sizeof (handle->buffer),
+                                       0,
+                                       handle->cancellable,
+                                       file_read_callback, handle);
+            return;
+        }
+    }
+
+    load_done (handle, error, bytes_read == 0);
+
+    if (error != NULL)
+    {
+        g_error_free (error);
+    }
+}
+
+static void
+file_opened_callback (GObject *source_object,
+                      GAsyncResult *res,
+                      gpointer user_data)
+{
+    EelPixbufLoadHandle *handle;
+    GFileInputStream *stream;
+    GError *error;
+
+    handle = user_data;
+
+    if (g_cancellable_is_cancelled (handle->cancellable))
+    {
+        free_pixbuf_load_handle (handle);
+        return;
+    }
+
+    error = NULL;
+    stream = g_file_read_finish (G_FILE (source_object), res, &error);
+
+    if (stream == NULL)
+    {
+        load_done (handle, error, FALSE);
+        g_error_free (error);
+        return;
+    }
+
+    handle->stream = G_INPUT_STREAM (stream);
+    handle->loader = gdk_pixbuf_loader_new ();
+
+
+    g_input_stream_read_async (handle->stream,
+                               handle->buffer,
+                               sizeof (handle->buffer),
+                               0,
+                               handle->cancellable,
+                               file_read_callback, handle);
+}
+
+EelPixbufLoadHandle *
+eel_gdk_pixbuf_load_async (const char *uri,
+                           int priority,
+                           EelPixbufLoadCallback callback,
+                           gpointer callback_data)
+{
+    EelPixbufLoadHandle *handle;
+    GFile *file;
+
+    handle = g_new0 (EelPixbufLoadHandle, 1);
+    handle->cancellable = g_cancellable_new ();
+    handle->callback = callback;
+    handle->callback_data = callback_data;
+
+    file = g_file_new_for_uri (uri);
+
+    g_file_read_async (file, priority, handle->cancellable,
+                       file_opened_callback, handle);
+
+    return handle;
+}
+
+void
+eel_cancel_gdk_pixbuf_load (EelPixbufLoadHandle *handle)
+{
+    if (handle == NULL)
+    {
+        return;
+    }
+
+    g_cancellable_cancel (handle->cancellable);
+}
+
+/* return the average value of each component */
+guint32
+eel_gdk_pixbuf_average_value (GdkPixbuf *pixbuf)
+{
+    guint64 a_total, r_total, g_total, b_total;
+    guint row, column;
+    int row_stride;
+    const guchar *pixels, *p;
+    int r, g, b, a;
+    guint64 dividend;
+    guint width, height;
+
+    width = gdk_pixbuf_get_width (pixbuf);
+    height = gdk_pixbuf_get_height (pixbuf);
+    row_stride = gdk_pixbuf_get_rowstride (pixbuf);
+    pixels = gdk_pixbuf_get_pixels (pixbuf);
+
+    /* iterate through the pixbuf, counting up each component */
+    a_total = 0;
+    r_total = 0;
+    g_total = 0;
+    b_total = 0;
+
+    if (gdk_pixbuf_get_has_alpha (pixbuf))
+    {
+        for (row = 0; row < height; row++)
+        {
+            p = pixels + (row * row_stride);
+            for (column = 0; column < width; column++)
+            {
+                r = *p++;
+                g = *p++;
+                b = *p++;
+                a = *p++;
+
+                a_total += a;
+                r_total += r * a;
+                g_total += g * a;
+                b_total += b * a;
+            }
+        }
+        dividend = height * width * 0xFF;
+        a_total *= 0xFF;
+    }
+    else
+    {
+        for (row = 0; row < height; row++)
+        {
+            p = pixels + (row * row_stride);
+            for (column = 0; column < width; column++)
+            {
+                r = *p++;
+                g = *p++;
+                b = *p++;
+
+                r_total += r;
+                g_total += g;
+                b_total += b;
+            }
+        }
+        dividend = height * width;
+        a_total = dividend * 0xFF;
+    }
+
+    return ((a_total + dividend / 2) / dividend) << 24
+           | ((r_total + dividend / 2) / dividend) << 16
+           | ((g_total + dividend / 2) / dividend) << 8
+           | ((b_total + dividend / 2) / dividend);
+}
+
+double
+eel_gdk_scale_to_fit_factor (int width, int height,
+                             int max_width, int max_height,
+                             int *scaled_width, int *scaled_height)
+{
+    double scale_factor;
+
+    scale_factor = MIN (max_width  / (double) width, max_height / (double) height);
+
+    *scaled_width  = floor (width * scale_factor + .5);
+    *scaled_height = floor (height * scale_factor + .5);
+
+    return scale_factor;
+}
+
+/* Returns a scaled copy of pixbuf, preserving aspect ratio. The copy will
+ * be scaled as large as possible without exceeding the specified width and height.
+ */
+GdkPixbuf *
+eel_gdk_pixbuf_scale_to_fit (GdkPixbuf *pixbuf, int max_width, int max_height)
+{
+    int scaled_width;
+    int scaled_height;
+
+    eel_gdk_scale_to_fit_factor (gdk_pixbuf_get_width(pixbuf), gdk_pixbuf_get_height(pixbuf),
+                                 max_width, max_height,
+                                 &scaled_width, &scaled_height);
+
+    return gdk_pixbuf_scale_simple (pixbuf, scaled_width, scaled_height, GDK_INTERP_BILINEAR);
+}
+
+/* Returns a copy of pixbuf scaled down, preserving aspect ratio, to fit
+ * within the specified width and height. If it already fits, a copy of
+ * the original, without scaling, is returned.
+ */
+GdkPixbuf *
+eel_gdk_pixbuf_scale_down_to_fit (GdkPixbuf *pixbuf, int max_width, int max_height)
+{
+    int scaled_width;
+    int scaled_height;
+
+    double scale_factor;
+
+    scale_factor = eel_gdk_scale_to_fit_factor (gdk_pixbuf_get_width(pixbuf), gdk_pixbuf_get_height(pixbuf),
+                   max_width, max_height,
+                   &scaled_width, &scaled_height);
+
+    if (scale_factor >= 1.0)
+    {
+        return gdk_pixbuf_copy (pixbuf);
+    }
+    else
+    {
+        return eel_gdk_pixbuf_scale_down (pixbuf, scaled_width, scaled_height);
+    }
+}
+
+double
+eel_gdk_scale_to_min_factor (int width, int height,
+                             int min_width, int min_height,
+                             int *scaled_width, int *scaled_height)
+{
+    double scale_factor;
+
+    scale_factor = MAX (min_width / (double) width, min_height / (double) height);
+
+    *scaled_width  = floor (width * scale_factor + .5);
+    *scaled_height = floor (height * scale_factor + .5);
+
+    return scale_factor;
+}
+
+/* Returns a scaled copy of pixbuf, preserving aspect ratio. The copy will
+ * be scaled as small as possible without going under the specified width and height.
+ */
+GdkPixbuf *
+eel_gdk_pixbuf_scale_to_min (GdkPixbuf *pixbuf, int min_width, int min_height)
+{
+    int scaled_width;
+    int scaled_height;
+
+    eel_gdk_scale_to_min_factor (gdk_pixbuf_get_width(pixbuf), gdk_pixbuf_get_height(pixbuf),
+                                 min_width, min_height,
+                                 &scaled_width, &scaled_height);
+
+    return gdk_pixbuf_scale_simple (pixbuf, scaled_width, scaled_height, GDK_INTERP_BILINEAR);
+}
+
+/**
+ * eel_gdk_pixbuf_is_valid:
+ * @pixbuf: A GdkPixbuf
+ *
+ * Return value: A boolean indicating whether the given pixbuf is valid.
+ *
+ * A pixbuf is valid if:
+ *
+ *   1. It is non NULL
+ *   2. It is has non NULL pixel data.
+ *   3. It has width and height greater than 0.
+ */
+gboolean
+eel_gdk_pixbuf_is_valid (const GdkPixbuf *pixbuf)
+{
+    return ((pixbuf != NULL)
+            && (gdk_pixbuf_get_pixels (pixbuf) != NULL)
+            && (gdk_pixbuf_get_width (pixbuf) > 0)
+            && (gdk_pixbuf_get_height (pixbuf) > 0));
+}
+
+/**
+ * eel_gdk_pixbuf_get_dimensions:
+ * @pixbuf: A GdkPixbuf
+ *
+ * Return value: The dimensions of the pixbuf as a EelDimensions.
+ *
+ * This function is useful in code that uses libart rect
+ * intersection routines.
+ */
+EelDimensions
+eel_gdk_pixbuf_get_dimensions (const GdkPixbuf *pixbuf)
+{
+    EelDimensions dimensions;
+
+    g_return_val_if_fail (eel_gdk_pixbuf_is_valid (pixbuf), eel_dimensions_empty);
+
+    dimensions.width = gdk_pixbuf_get_width (pixbuf);
+    dimensions.height = gdk_pixbuf_get_height (pixbuf);
+
+    return dimensions;
+}
+
+/**
+ * eel_gdk_pixbuf_fill_rectangle_with_color:
+ * @pixbuf: Target pixbuf to fill into.
+ * @area: Rectangle to fill.
+ * @color: The color to use.
+ *
+ * Fill the rectangle with the the given color.
+ */
+void
+eel_gdk_pixbuf_fill_rectangle_with_color (GdkPixbuf *pixbuf,
+        EelIRect area,
+        guint32 color)
+{
+    EelIRect target;
+    guchar red;
+    guchar green;
+    guchar blue;
+    guchar alpha;
+    guchar *pixels;
+    gboolean has_alpha;
+    guint pixel_offset;
+    guint rowstride;
+    guchar *row_offset;
+    int x;
+    int y;
+
+    g_return_if_fail (eel_gdk_pixbuf_is_valid (pixbuf));
+
+    target = eel_gdk_pixbuf_intersect (pixbuf, 0, 0, area);
+    if (eel_irect_is_empty (&target))
+    {
+        return;
+    }
+
+    pixels = gdk_pixbuf_get_pixels (pixbuf);
+    rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+    has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
+    pixel_offset = has_alpha ? 4 : 3;
+    red = EEL_RGBA_COLOR_GET_R (color);
+    green = EEL_RGBA_COLOR_GET_G (color);
+    blue = EEL_RGBA_COLOR_GET_B (color);
+    alpha = EEL_RGBA_COLOR_GET_A (color);
+
+    row_offset = pixels + target.y0 * rowstride;
+
+    for (y = target.y0; y < target.y1; y++)
+    {
+        guchar *offset = row_offset + (target.x0 * pixel_offset);
+
+        for (x = target.x0; x < target.x1; x++)
+        {
+            *(offset++) = red;
+            *(offset++) = green;
+            *(offset++) = blue;
+
+            if (has_alpha)
+            {
+                *(offset++) = alpha;
+            }
+
+        }
+
+        row_offset += rowstride;
+    }
+}
+
+gboolean
+eel_gdk_pixbuf_save_to_file (const GdkPixbuf *pixbuf,
+                             const char *file_name)
+{
+    return gdk_pixbuf_save ((GdkPixbuf *) pixbuf,
+                            file_name, "png", NULL, NULL);
+}
+
+void
+eel_gdk_pixbuf_ref_if_not_null (GdkPixbuf *pixbuf_or_null)
+{
+    if (pixbuf_or_null != NULL)
+    {
+        g_object_ref (pixbuf_or_null);
+    }
+}
+
+void
+eel_gdk_pixbuf_unref_if_not_null (GdkPixbuf *pixbuf_or_null)
+{
+    if (pixbuf_or_null != NULL)
+    {
+        g_object_unref (pixbuf_or_null);
+    }
+}
+
+void
+eel_gdk_pixbuf_draw_to_drawable (const GdkPixbuf *pixbuf,
+                                 GdkDrawable *drawable,
+                                 GdkGC *gc,
+                                 int source_x,
+                                 int source_y,
+                                 EelIRect destination_area,
+                                 GdkRgbDither dither,
+                                 GdkPixbufAlphaMode alpha_compositing_mode,
+                                 int alpha_threshold)
+{
+    EelDimensions dimensions;
+    EelIRect target;
+    EelIRect source;
+    int target_width;
+    int target_height;
+    int source_width;
+    int source_height;
+
+    g_return_if_fail (eel_gdk_pixbuf_is_valid (pixbuf));
+    g_return_if_fail (drawable != NULL);
+    g_return_if_fail (gc != NULL);
+    g_return_if_fail (!eel_irect_is_empty (&destination_area));
+    g_return_if_fail (alpha_threshold > EEL_OPACITY_FULLY_TRANSPARENT);
+    g_return_if_fail (alpha_threshold <= EEL_OPACITY_FULLY_OPAQUE);
+    g_return_if_fail (alpha_compositing_mode >= GDK_PIXBUF_ALPHA_BILEVEL);
+    g_return_if_fail (alpha_compositing_mode <= GDK_PIXBUF_ALPHA_FULL);
+
+    dimensions = eel_gdk_pixbuf_get_dimensions (pixbuf);
+
+    g_return_if_fail (source_x >= 0);
+    g_return_if_fail (source_y >= 0);
+    g_return_if_fail (source_x < dimensions.width);
+    g_return_if_fail (source_y < dimensions.height);
+
+    /* Clip the destination area to the pixbuf dimensions; bail if no work */
+    target = eel_gdk_pixbuf_intersect (pixbuf,
+                                       destination_area.x0,
+                                       destination_area.y0,
+                                       destination_area);
+    if (eel_irect_is_empty (&target))
+    {
+        return;
+    }
+
+    /* Assign the source area */
+    source = eel_irect_assign (source_x,
+                               source_y,
+                               dimensions.width - source_x,
+                               dimensions.height - source_y);
+
+    /* Adjust the target width if the source area is smaller than the
+     * source pixbuf dimensions */
+    target_width = target.x1 - target.x0;
+    target_height = target.y1 - target.y0;
+    source_width = source.x1 - source.x0;
+    source_height = source.y1 - source.y0;
+
+    target.x1 = target.x0 + MIN (target_width, source_width);
+    target.y1 = target.y0 + MIN (target_height, source_height);
+
+    gdk_draw_pixbuf (drawable, gc, (GdkPixbuf *) pixbuf,
+                     source.x0,
+                     source.y0,
+                     target.x0,
+                     target.y0,
+                     target.x1 - target.x0,
+                     target.y1 - target.y0,
+                     dither,
+                     0,
+                     0);
+}
+
+/**
+ * eel_gdk_pixbuf_draw_to_pixbuf:
+ * @pixbuf: The source pixbuf to draw.
+ * @destination_pixbuf: The destination pixbuf.
+ * @source_x: The source pixbuf x coordiate to composite from.
+ * @source_y: The source pixbuf y coordiate to composite from.
+ * @destination_area: The destination area within the destination pixbuf.
+ *                    This area will be clipped if invalid in any way.
+ *
+ * Copy one pixbuf onto another another..  This function has some advantages
+ * over plain gdk_pixbuf_copy_area():
+ *
+ *   Composition paramters (source coordinate, destination area) are
+ *   given in a way that is consistent with the rest of the extensions
+ *   in this file.  That is, it matches the declaration of
+ *   eel_gdk_pixbuf_draw_to_pixbuf_alpha() and
+ *   eel_gdk_pixbuf_draw_to_drawable() very closely.
+ *
+ *   All values are clipped to make sure they are valid.
+ *
+ */
+void
+eel_gdk_pixbuf_draw_to_pixbuf (const GdkPixbuf *pixbuf,
+                               GdkPixbuf *destination_pixbuf,
+                               int source_x,
+                               int source_y,
+                               EelIRect destination_area)
+{
+    EelDimensions dimensions;
+    EelIRect target;
+    EelIRect source;
+    int target_width;
+    int target_height;
+    int source_width;
+    int source_height;
+
+    g_return_if_fail (eel_gdk_pixbuf_is_valid (pixbuf));
+    g_return_if_fail (eel_gdk_pixbuf_is_valid (destination_pixbuf));
+    g_return_if_fail (!eel_irect_is_empty (&destination_area));
+
+    dimensions = eel_gdk_pixbuf_get_dimensions (pixbuf);
+
+    g_return_if_fail (source_x >= 0);
+    g_return_if_fail (source_y >= 0);
+    g_return_if_fail (source_x < dimensions.width);
+    g_return_if_fail (source_y < dimensions.height);
+
+    /* Clip the destination area to the pixbuf dimensions; bail if no work */
+    target = eel_gdk_pixbuf_intersect (destination_pixbuf, 0, 0, destination_area);
+    if (eel_irect_is_empty (&target))
+    {
+        return;
+    }
+
+    /* Assign the source area */
+    source = eel_irect_assign (source_x,
+                               source_y,
+                               dimensions.width - source_x,
+                               dimensions.height - source_y);
+
+    /* Adjust the target width if the source area is smaller than the
+     * source pixbuf dimensions */
+    target_width = target.x1 - target.x0;
+    target_height = target.y1 - target.y0;
+    source_width = source.x1 - source.x0;
+    source_height = source.y1 - source.y0;
+
+    target.x1 = target.x0 + MIN (target_width, source_width);
+    target.y1 = target.y0 + MIN (target_height, source_height);
+
+    gdk_pixbuf_copy_area (pixbuf,
+                          source.x0,
+                          source.y0,
+                          target.x1 - target.x0,
+                          target.y1 - target.y0,
+                          destination_pixbuf,
+                          target.x0,
+                          target.y0);
+}
+
+/**
+ * eel_gdk_pixbuf_draw_to_pixbuf_alpha:
+ * @pixbuf: The source pixbuf to draw.
+ * @destination_pixbuf: The destination pixbuf.
+ * @source_x: The source pixbuf x coordiate to composite from.
+ * @source_y: The source pixbuf y coordiate to composite from.
+ * @destination_area: The destination area within the destination pixbuf.
+ *                    This area will be clipped if invalid in any way.
+ * @opacity: The opacity of the drawn tiles where 0 <= opacity <= 255.
+ * @interpolation_mode: The interpolation mode.  See <gdk-pixbuf.h>
+ *
+ * Composite one pixbuf over another.  This function has some advantages
+ * over plain gdk_pixbuf_composite():
+ *
+ *   Composition paramters (source coordinate, destination area) are
+ *   given in a way that is consistent with the rest of the extensions
+ *   in this file.  That is, it matches the declaration of
+ *   eel_gdk_pixbuf_draw_to_pixbuf() and
+ *   eel_gdk_pixbuf_draw_to_drawable() very closely.
+ *
+ *   All values are clipped to make sure they are valid.
+ *
+ *   Workaround a limitation in gdk_pixbuf_composite() that does not allow
+ *   the source (x,y) to be greater than (0,0)
+ *
+ */
+void
+eel_gdk_pixbuf_draw_to_pixbuf_alpha (const GdkPixbuf *pixbuf,
+                                     GdkPixbuf *destination_pixbuf,
+                                     int source_x,
+                                     int source_y,
+                                     EelIRect destination_area,
+                                     int opacity,
+                                     GdkInterpType interpolation_mode)
+{
+    EelDimensions dimensions;
+    EelIRect target;
+    EelIRect source;
+    int target_width;
+    int target_height;
+    int source_width;
+    int source_height;
+
+    g_return_if_fail (eel_gdk_pixbuf_is_valid (pixbuf));
+    g_return_if_fail (eel_gdk_pixbuf_is_valid (destination_pixbuf));
+    g_return_if_fail (!eel_irect_is_empty (&destination_area));
+    g_return_if_fail (opacity >= EEL_OPACITY_FULLY_TRANSPARENT);
+    g_return_if_fail (opacity <= EEL_OPACITY_FULLY_OPAQUE);
+    g_return_if_fail (interpolation_mode >= GDK_INTERP_NEAREST);
+    g_return_if_fail (interpolation_mode <= GDK_INTERP_HYPER);
+
+    dimensions = eel_gdk_pixbuf_get_dimensions (pixbuf);
+
+    g_return_if_fail (source_x >= 0);
+    g_return_if_fail (source_y >= 0);
+    g_return_if_fail (source_x < dimensions.width);
+    g_return_if_fail (source_y < dimensions.height);
+
+    /* Clip the destination area to the pixbuf dimensions; bail if no work */
+    target = eel_gdk_pixbuf_intersect (destination_pixbuf, 0, 0, destination_area);
+    if (eel_irect_is_empty (&target))
+    {
+        return;
+    }
+
+    /* Assign the source area */
+    source = eel_irect_assign (source_x,
+                               source_y,
+                               dimensions.width - source_x,
+                               dimensions.height - source_y);
+
+    /* Adjust the target width if the source area is smaller than the
+     * source pixbuf dimensions */
+    target_width = target.x1 - target.x0;
+    target_height = target.y1 - target.y0;
+    source_width = source.x1 - source.x0;
+    source_height = source.y1 - source.y0;
+
+    target.x1 = target.x0 + MIN (target_width, source_width);
+    target.y1 = target.y0 + MIN (target_height, source_height);
+
+    /* If the source point is not (0,0), then we need to create a sub pixbuf
+     * with only the source area.  This is needed to work around a limitation
+     * in gdk_pixbuf_composite() that requires the source area to be (0,0). */
+    if (source.x0 != 0 || source.y0 != 0)
+    {
+        EelIRect area;
+        int width;
+        int height;
+
+        width = dimensions.width - source.x0;
+        height = dimensions.height - source.y0;
+
+        area.x0 = source.x0;
+        area.y0 = source.y0;
+        area.x1 = area.x0 + width;
+        area.y1 = area.y0 + height;
+
+        pixbuf = eel_gdk_pixbuf_new_from_pixbuf_sub_area ((GdkPixbuf *) pixbuf, area);
+    }
+    else
+    {
+        g_object_ref (G_OBJECT (pixbuf));
+    }
+
+    gdk_pixbuf_composite (pixbuf,
+                          destination_pixbuf,
+                          target.x0,
+                          target.y0,
+                          target.x1 - target.x0,
+                          target.y1 - target.y0,
+                          target.x0,
+                          target.y0,
+                          1.0,
+                          1.0,
+                          interpolation_mode,
+                          opacity);
+
+    g_object_unref (G_OBJECT (pixbuf));
+}
+
+static void
+pixbuf_destroy_callback (guchar  *pixels,
+                         gpointer callback_data)
+{
+    g_assert (pixels != NULL);
+    g_assert (callback_data != NULL);
+
+    g_object_unref (callback_data);
+}
+
+/**
+ * eel_gdk_pixbuf_new_from_pixbuf_sub_area:
+ * @pixbuf: The source pixbuf.
+ * @area: The area within the source pixbuf to use for the sub pixbuf.
+ *        This area needs to be contained within the bounds of the
+ *        source pixbuf, otherwise it will be clipped to that.
+ *
+ * Return value: A newly allocated pixbuf that shares the pixel data
+ *               of the source pixbuf in order to represent a sub area.
+ *
+ * Create a pixbuf from a sub area of another pixbuf.  The resulting pixbuf
+ * will share the pixel data of the source pixbuf.  Memory bookeeping is
+ * all taken care for the caller.  All you need to do is g_object_unref()
+ * the resulting pixbuf to properly free resources.
+ */
+GdkPixbuf *
+eel_gdk_pixbuf_new_from_pixbuf_sub_area (GdkPixbuf *pixbuf,
+        EelIRect area)
+{
+    GdkPixbuf *sub_pixbuf;
+    EelIRect target;
+    guchar *pixels;
+
+    g_return_val_if_fail (eel_gdk_pixbuf_is_valid (pixbuf), NULL);
+    g_return_val_if_fail (!eel_irect_is_empty (&area), NULL);
+
+    /* Clip the pixbuf by the given area; bail if no work */
+    target = eel_gdk_pixbuf_intersect (pixbuf, 0, 0, area);
+    if (eel_irect_is_empty (&target))
+    {
+        return NULL;
+    }
+
+    /* Since we are going to be sharing the given pixbuf's data, we need
+     * to ref it.  It will be unreffed in the destroy function above */
+    g_object_ref (pixbuf);
+
+    /* Compute the offset into the pixel data */
+    pixels =
+        gdk_pixbuf_get_pixels (pixbuf)
+        + (target.y0 * gdk_pixbuf_get_rowstride (pixbuf))
+        + (target.x0 * (gdk_pixbuf_get_has_alpha (pixbuf) ? 4 : 3));
+
+    /* Make a pixbuf pretending its real estate is the sub area */
+    sub_pixbuf = gdk_pixbuf_new_from_data (pixels,
+                                           GDK_COLORSPACE_RGB,
+                                           gdk_pixbuf_get_has_alpha (pixbuf),
+                                           8,
+                                           eel_irect_get_width (target),
+                                           eel_irect_get_height (target),
+                                           gdk_pixbuf_get_rowstride (pixbuf),
+                                           pixbuf_destroy_callback,
+                                           pixbuf);
+
+    return sub_pixbuf;
+}
+
+/**
+ * eel_gdk_pixbuf_new_from_existing_buffer:
+ * @buffer: The existing buffer.
+ * @buffer_rowstride: The existing buffer's rowstride.
+ * @buffer_has_alpha: A boolean value indicating whether the buffer has alpha.
+ * @area: The area within the existing buffer to use for the pixbuf.
+ *        This area needs to be contained within the bounds of the
+ *        buffer, otherwise memory will be trashed.
+ *
+ * Return value: A newly allocated pixbuf that uses the existing buffer
+ *               for its pixel data.
+ *
+ * Create a pixbuf from an existing buffer.
+ *
+ * The resulting pixbuf is only valid for as long as &buffer is valid.  It is
+ * up to the caller to make sure they both exist in the same scope.
+ * Also, it is up to the caller to make sure that the given area is fully
+ * contained in the buffer, otherwise memory trashing will happen.
+ */
+GdkPixbuf *
+eel_gdk_pixbuf_new_from_existing_buffer (guchar *buffer,
+        int buffer_rowstride,
+        gboolean buffer_has_alpha,
+        EelIRect area)
+{
+    GdkPixbuf *pixbuf;
+    guchar *pixels;
+
+    g_return_val_if_fail (buffer != NULL, NULL);
+    g_return_val_if_fail (buffer_rowstride > 0, NULL);
+    g_return_val_if_fail (!eel_irect_is_empty (&area), NULL);
+
+    /* Compute the offset into the buffer */
+    pixels =
+        buffer
+        + (area.y0 * buffer_rowstride)
+        + (area.x0 * (buffer_has_alpha ? 4 : 3));
+
+    pixbuf = gdk_pixbuf_new_from_data (pixels,
+                                       GDK_COLORSPACE_RGB,
+                                       buffer_has_alpha,
+                                       8,
+                                       eel_irect_get_width (area),
+                                       eel_irect_get_height (area),
+                                       buffer_rowstride,
+                                       NULL,
+                                       NULL);
+
+    return pixbuf;
+}
+
+/**
+ * eel_gdk_pixbuf_intersect:
+ * @pixbuf: A GdkPixbuf.
+ * @pixbuf_x: X coordinate of pixbuf.
+ * @pixbuf_y: Y coordinate of pixbuf.
+ * @rectangle: An EelIRect.
+ *
+ * Return value: The intersection of the pixbuf and the given rectangle.
+ *
+ */
+EelIRect
+eel_gdk_pixbuf_intersect (const GdkPixbuf *pixbuf,
+                          int pixbuf_x,
+                          int pixbuf_y,
+                          EelIRect rectangle)
+{
+    EelIRect intersection;
+    EelIRect bounds;
+    EelDimensions dimensions;
+
+    g_return_val_if_fail (eel_gdk_pixbuf_is_valid (pixbuf), eel_irect_empty);
+
+    dimensions = eel_gdk_pixbuf_get_dimensions (pixbuf);
+    bounds = eel_irect_assign_dimensions (pixbuf_x, pixbuf_y, dimensions);
+
+    eel_irect_intersect (&intersection, &rectangle, &bounds);
+
+    /* In theory, this is not needed because a rectangle is empty
+     * regardless of how MUCH negative the dimensions are.
+     * However, to make debugging and self checks simpler, we
+     * consistenly return a standard empty rectangle.
+     */
+    if (eel_irect_is_empty (&intersection))
+    {
+        return eel_irect_empty;
+    }
+
+    return intersection;
+}
+
+GdkPixbuf *
+eel_gdk_pixbuf_scale_down (GdkPixbuf *pixbuf,
+                           int dest_width,
+                           int dest_height)
+{
+    int source_width, source_height;
+    int s_x1, s_y1, s_x2, s_y2;
+    int s_xfrac, s_yfrac;
+    int dx, dx_frac, dy, dy_frac;
+    div_t ddx, ddy;
+    int x, y;
+    int r, g, b, a;
+    int n_pixels;
+    gboolean has_alpha;
+    guchar *dest, *src, *xsrc, *src_pixels;
+    GdkPixbuf *dest_pixbuf;
+    int pixel_stride;
+    int source_rowstride, dest_rowstride;
+
+    if (dest_width == 0 || dest_height == 0)
+    {
+        return NULL;
+    }
+
+    source_width = gdk_pixbuf_get_width (pixbuf);
+    source_height = gdk_pixbuf_get_height (pixbuf);
+
+    g_assert (source_width >= dest_width);
+    g_assert (source_height >= dest_height);
+
+    ddx = div (source_width, dest_width);
+    dx = ddx.quot;
+    dx_frac = ddx.rem;
+
+    ddy = div (source_height, dest_height);
+    dy = ddy.quot;
+    dy_frac = ddy.rem;
+
+    has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
+    source_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+    src_pixels = gdk_pixbuf_get_pixels (pixbuf);
+
+    dest_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, has_alpha, 8,
+                                  dest_width, dest_height);
+    dest = gdk_pixbuf_get_pixels (dest_pixbuf);
+    dest_rowstride = gdk_pixbuf_get_rowstride (dest_pixbuf);
+
+    pixel_stride = (has_alpha)?4:3;
+
+    s_y1 = 0;
+    s_yfrac = -dest_height/2;
+    while (s_y1 < source_height)
+    {
+        s_y2 = s_y1 + dy;
+        s_yfrac += dy_frac;
+        if (s_yfrac > 0)
+        {
+            s_y2++;
+            s_yfrac -= dest_height;
+        }
+
+        s_x1 = 0;
+        s_xfrac = -dest_width/2;
+        while (s_x1 < source_width)
+        {
+            s_x2 = s_x1 + dx;
+            s_xfrac += dx_frac;
+            if (s_xfrac > 0)
+            {
+                s_x2++;
+                s_xfrac -= dest_width;
+            }
+
+            /* Average block of [x1,x2[ x [y1,y2[ and store in dest */
+            r = g = b = a = 0;
+            n_pixels = 0;
+
+            src = src_pixels + s_y1 * source_rowstride + s_x1 * pixel_stride;
+            for (y = s_y1; y < s_y2; y++)
+            {
+                xsrc = src;
+                if (has_alpha)
+                {
+                    for (x = 0; x < s_x2-s_x1; x++)
+                    {
+                        n_pixels++;
+
+                        r += xsrc[3] * xsrc[0];
+                        g += xsrc[3] * xsrc[1];
+                        b += xsrc[3] * xsrc[2];
+                        a += xsrc[3];
+                        xsrc += 4;
+                    }
+                }
+                else
+                {
+                    for (x = 0; x < s_x2-s_x1; x++)
+                    {
+                        n_pixels++;
+                        r += *xsrc++;
+                        g += *xsrc++;
+                        b += *xsrc++;
+                    }
+                }
+                src += source_rowstride;
+            }
+
+            if (has_alpha)
+            {
+                if (a != 0)
+                {
+                    *dest++ = r / a;
+                    *dest++ = g / a;
+                    *dest++ = b / a;
+                    *dest++ = a / n_pixels;
+                }
+                else
+                {
+                    *dest++ = 0;
+                    *dest++ = 0;
+                    *dest++ = 0;
+                    *dest++ = 0;
+                }
+            }
+            else
+            {
+                *dest++ = r / n_pixels;
+                *dest++ = g / n_pixels;
+                *dest++ = b / n_pixels;
+            }
+
+            s_x1 = s_x2;
+        }
+        s_y1 = s_y2;
+        dest += dest_rowstride - dest_width * pixel_stride;
+    }
+
+    return dest_pixbuf;
+}
+
+static guchar
+eel_gdk_pixbuf_lighten_pixbuf_component (guchar cur_value,
+        guint lighten_value)
+{
+    int new_value = cur_value;
+    if (lighten_value > 0)
+    {
+        new_value += lighten_value + (new_value >> 3);
+        if (new_value > 255)
+        {
+            new_value = 255;
+        }
+    }
+    return (guchar) new_value;
+}
+
+static GdkPixbuf *
+eel_gdk_pixbuf_lighten (GdkPixbuf* src,
+                        guint lighten_value)
+{
+    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_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));
+    g_assert (gdk_pixbuf_get_bits_per_sample (src) == 8);
+
+    dest = 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));
+
+    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++ = eel_gdk_pixbuf_lighten_pixbuf_component (*pixsrc++, lighten_value);
+            *pixdest++ = eel_gdk_pixbuf_lighten_pixbuf_component (*pixsrc++, lighten_value);
+            *pixdest++ = eel_gdk_pixbuf_lighten_pixbuf_component (*pixsrc++, lighten_value);
+            if (has_alpha)
+            {
+                *pixdest++ = *pixsrc++;
+            }
+        }
+    }
+    return dest;
+}
+
+GdkPixbuf *
+eel_gdk_pixbuf_render (GdkPixbuf *pixbuf,
+                       guint render_mode,
+                       guint saturation,
+                       guint brightness,
+                       guint lighten_value,
+                       guint color)
+{
+    GdkPixbuf *temp_pixbuf, *old_pixbuf;
+
+    if (render_mode == 1)
+    {
+        /* lighten icon */
+        temp_pixbuf = eel_create_spotlight_pixbuf (pixbuf);
+    }
+    else if (render_mode == 2)
+    {
+        /* colorize icon */
+        temp_pixbuf = eel_create_colorized_pixbuf (pixbuf,
+                      EEL_RGBA_COLOR_GET_R (color),
+                      EEL_RGBA_COLOR_GET_G (color),
+                      EEL_RGBA_COLOR_GET_B (color));
+    }
+    else if (render_mode == 3)
+    {
+        /* monochromely colorize icon */
+        old_pixbuf = eel_create_darkened_pixbuf (pixbuf, 0, 255);
+        temp_pixbuf = eel_create_colorized_pixbuf (old_pixbuf,
+                      EEL_RGBA_COLOR_GET_R (color),
+                      EEL_RGBA_COLOR_GET_G (color),
+                      EEL_RGBA_COLOR_GET_B (color));
+        g_object_unref (old_pixbuf);
+    }
+    else
+    {
+        temp_pixbuf = NULL;
+    }
+
+    if (saturation < 255 || brightness < 255 || temp_pixbuf == NULL)   // temp_pixbuf == NULL just for safer code (return copy)
+    {
+        old_pixbuf = temp_pixbuf;
+        temp_pixbuf = eel_create_darkened_pixbuf (temp_pixbuf ? temp_pixbuf : pixbuf, saturation, brightness);
+        if (old_pixbuf)
+        {
+            g_object_unref (old_pixbuf);
+        }
+    }
+
+    if (lighten_value > 0)
+    {
+        old_pixbuf = temp_pixbuf;
+        temp_pixbuf = eel_gdk_pixbuf_lighten (temp_pixbuf ? temp_pixbuf : pixbuf, lighten_value);
+        if (old_pixbuf)
+        {
+            g_object_unref (old_pixbuf);
+        }
+    }
+
+    return temp_pixbuf;
+}
+
+
+#if !defined (EEL_OMIT_SELF_CHECK)
+
+static char *
+check_average_value (int width, int height, const char* fill)
+{
+    char c;
+    guint r, g, b, a;
+    gboolean alpha, gray;
+    int gray_tweak;
+    GdkPixbuf *pixbuf;
+    int x, y, rowstride, n_channels;
+    guchar *pixels;
+    guint32 average;
+    guchar v;
+
+    r = g = b = a = 0;
+    alpha = FALSE;
+    gray = FALSE;
+    gray_tweak = 0;
+    if (sscanf (fill, " %x,%x,%x,%x %c", &r, &g, &b, &a, &c) == 4)
+    {
+        alpha = TRUE;
+    }
+    else if (sscanf (fill, " %x,%x,%x %c", &r, &g, &b, &c) == 3)
+    {
+    }
+    else if (sscanf (fill, " gray%d %c", &gray_tweak, &c) == 1)
+    {
+        gray = TRUE;
+    }
+    else
+    {
+        return g_strdup ("bad fill string format");
+    }
+
+    pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, alpha, 8, width, height);
+
+    pixels = gdk_pixbuf_get_pixels (pixbuf);
+    rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+    n_channels = gdk_pixbuf_get_n_channels (pixbuf);
+
+    if (!gray)
+    {
+        for (y = 0; y < height; y++)
+        {
+            for (x = 0; x < width; x++)
+            {
+                pixels [y * rowstride + x * n_channels + 0] = r;
+                pixels [y * rowstride + x * n_channels + 1] = g;
+                pixels [y * rowstride + x * n_channels + 2] = b;
+                if (alpha)
+                {
+                    pixels [y * rowstride + x * n_channels + 3] = a;
+                }
+            }
+        }
+    }
+    else
+    {
+        for (y = 0; y < height; y++)
+        {
+            for (x = 0; x < width; x++)
+            {
+                v = ((x + y) & 1) ? 0x80 : 0x7F;
+                if (((x + y) & 0xFF) == 0)
+                    v += gray_tweak;
+                pixels [y * rowstride + x * n_channels + 0] = v;
+                pixels [y * rowstride + x * n_channels + 1] = v;
+                pixels [y * rowstride + x * n_channels + 2] = v;
+            }
+        }
+        pixels [0] += gray_tweak;
+        pixels [1] += gray_tweak;
+        pixels [2] += gray_tweak;
+    }
+
+    average = eel_gdk_pixbuf_average_value (pixbuf);
+    g_object_unref (pixbuf);
+
+    return g_strdup_printf ("%02X,%02X,%02X,%02X",
+                            (average >> 16) & 0xFF,
+                            (average >> 8) & 0xFF,
+                            average & 0xFF,
+                            average >> 24);
+}
+
+void
+eel_self_check_gdk_pixbuf_extensions (void)
+{
+    GdkPixbuf *pixbuf;
+    EelIRect clip_area;
+
+    pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 100, 100);
+
+    EEL_CHECK_BOOLEAN_RESULT (eel_gdk_pixbuf_is_valid (pixbuf), TRUE);
+    EEL_CHECK_BOOLEAN_RESULT (eel_gdk_pixbuf_is_valid (NULL), FALSE);
+
+    EEL_CHECK_DIMENSIONS_RESULT (eel_gdk_pixbuf_get_dimensions (pixbuf), 100, 100);
+
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, eel_gdk_pixbuf_whole_pixbuf), 0, 0, 100, 100);
+
+    clip_area = eel_irect_assign (0, 0, 0, 0);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 0, 0);
+
+    clip_area = eel_irect_assign (0, 0, 0, 0);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 0, 0);
+
+    clip_area = eel_irect_assign (0, 0, 100, 100);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 100, 100);
+
+    clip_area = eel_irect_assign (-10, -10, 100, 100);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 90, 90);
+
+    clip_area = eel_irect_assign (-10, -10, 110, 110);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 100, 100);
+
+    clip_area = eel_irect_assign (0, 0, 99, 99);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 99, 99);
+
+    clip_area = eel_irect_assign (0, 0, 1, 1);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 1, 1);
+
+    clip_area = eel_irect_assign (-1, -1, 1, 1);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 0, 0);
+
+    clip_area = eel_irect_assign (-1, -1, 2, 2);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 1, 1);
+
+    clip_area = eel_irect_assign (100, 100, 1, 1);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 0, 0);
+
+    clip_area = eel_irect_assign (101, 101, 1, 1);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 0, 0, 0, 0);
+
+    clip_area = eel_irect_assign (80, 0, 100, 100);
+    EEL_CHECK_RECTANGLE_RESULT (eel_gdk_pixbuf_intersect (pixbuf, 0, 0, clip_area), 80, 0, 100, 100);
+
+    g_object_unref (pixbuf);
+
+    /* No checks for empty pixbufs because GdkPixbuf doesn't seem to allow them. */
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "00,00,00"), "00,00,00,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "00,00,00,00"), "00,00,00,00");
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "00,00,00,FF"), "00,00,00,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "01,01,01"), "01,01,01,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "FE,FE,FE"), "FE,FE,FE,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "FF,FF,FF"), "FF,FF,FF,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "FF,FF,FF,00"), "00,00,00,00");
+    EEL_CHECK_STRING_RESULT (check_average_value (1, 1, "11,22,33"), "11,22,33,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "00,00,00"), "00,00,00,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "00,00,00,00"), "00,00,00,00");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "00,00,00,FF"), "00,00,00,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "01,01,01"), "01,01,01,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "FE,FE,FE"), "FE,FE,FE,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "FF,FF,FF"), "FF,FF,FF,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "FF,FF,FF,00"), "00,00,00,00");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "11,22,33"), "11,22,33,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "gray -1"), "7F,7F,7F,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "gray 0"), "80,80,80,FF");
+    EEL_CHECK_STRING_RESULT (check_average_value (1000, 1000, "gray 1"), "80,80,80,FF");
+}
+
+#endif /* !EEL_OMIT_SELF_CHECK */
+