[mutter] Split shadow code into a separate file
- From: Owen Taylor <otaylor src gnome org>
- To: svn-commits-list gnome org
- Subject: [mutter] Split shadow code into a separate file
- Date: Mon, 6 Jul 2009 07:44:29 +0000 (UTC)
commit f0d22e18c41e342d7a11232f3a820d9694506025
Author: Owen W. Taylor <otaylor fishsoup net>
Date: Thu Jun 25 18:56:15 2009 -0400
Split shadow code into a separate file
Separate code related to creating the gaussian-blurred shadow texture
into a separate file.
Move the definition of MetaCompositor into a compositor-private.h
so that the shadow code can cache the source in the compositor
structure.
http://bugzilla.gnome.org/show_bug.cgi?id=587251
src/Makefile.am | 3 +
src/compositor/compositor-private.h | 25 +++
src/compositor/compositor.c | 373 +----------------------------------
src/compositor/shadow.c | 350 ++++++++++++++++++++++++++++++++
src/compositor/shadow.h | 9 +
5 files changed, 392 insertions(+), 368 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 3bc356f..d46a73a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -22,12 +22,15 @@ mutter_SOURCES= \
core/boxes.c \
include/boxes.h \
compositor/compositor.c \
+ compositor/compositor-private.h \
compositor/mutter-module.c \
compositor/mutter-module.h \
compositor/mutter-plugin.c \
compositor/mutter-plugin-manager.c \
compositor/mutter-plugin-manager.h \
compositor/mutter-shaped-texture.c \
+ compositor/shadow.c \
+ compositor/shadow.h \
compositor/mutter-shaped-texture.h \
compositor/tidy/tidy-texture-frame.c \
compositor/tidy/tidy-texture-frame.h \
diff --git a/src/compositor/compositor-private.h b/src/compositor/compositor-private.h
new file mode 100644
index 0000000..6611761
--- /dev/null
+++ b/src/compositor/compositor-private.h
@@ -0,0 +1,25 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+#ifndef META_COMPOSITOR_PRIVATE_H
+#define META_COMPOSITOR_PRIVATE_H
+
+#include "compositor.h"
+#include "display.h"
+#include <clutter/clutter.h>
+
+struct _MetaCompositor
+{
+ MetaDisplay *display;
+
+ Atom atom_x_root_pixmap;
+ Atom atom_x_set_root;
+ Atom atom_net_wm_window_opacity;
+
+ ClutterActor *shadow_src;
+
+ gboolean show_redraw : 1;
+ gboolean debug : 1;
+ gboolean no_mipmaps : 1;
+};
+
+#endif /* META_COMPOSITOR_PRIVATE_H */
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index e23a5c1..5a70bb9 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -1,28 +1,23 @@
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
-#define _GNU_SOURCE
-
#include <config.h>
-#include <stdlib.h>
#include <string.h>
-#include <math.h>
#include <unistd.h>
#include <gdk/gdk.h>
#include "../core/window-private.h"
-#include "display.h"
#include "screen.h"
#include "frame.h"
#include "errors.h"
#include "window.h"
-#include "compositor.h"
+#include "compositor-private.h"
#include "compositor-mutter.h"
#include "mutter-plugin-manager.h"
-#include "tidy/tidy-texture-frame.h"
#include "xprops.h"
#include "prefs.h"
+#include "shadow.h"
#include "mutter-shaped-texture.h"
#include <X11/Xatom.h>
#include <X11/Xlibint.h>
@@ -32,19 +27,8 @@
#include <X11/extensions/Xfixes.h>
#include <X11/extensions/Xrender.h>
-#include <clutter/clutter.h>
#include <clutter/x11/clutter-x11.h>
-#include <cogl/cogl.h>
-#define SHADOW_RADIUS 8
-#define SHADOW_OPACITY 0.9
-#define SHADOW_OFFSET_X (SHADOW_RADIUS)
-#define SHADOW_OFFSET_Y (SHADOW_RADIUS)
-
-#define MAX_TILE_SZ 8 /* Must be <= shaddow radius */
-#define TILE_WIDTH (3*MAX_TILE_SZ)
-#define TILE_HEIGHT (3*MAX_TILE_SZ)
-
#define CHECK_LIST_INTEGRITY_START(list) \
{int len2__; int len__ = g_list_length(list);
@@ -103,8 +87,6 @@ meta_xattrs_get_type (void)
return our_type;
}
-static unsigned char* shadow_gaussian_make_tile (void);
-
static inline gboolean
composite_at_least_version (MetaDisplay *display, int maj, int min)
{
@@ -117,21 +99,6 @@ composite_at_least_version (MetaDisplay *display, int maj, int min)
return (major > maj || (major == maj && minor >= min));
}
-struct _MetaCompositor
-{
- MetaDisplay *display;
-
- Atom atom_x_root_pixmap;
- Atom atom_x_set_root;
- Atom atom_net_wm_window_opacity;
-
- ClutterActor *shadow_src;
-
- gboolean show_redraw : 1;
- gboolean debug : 1;
- gboolean no_mipmaps : 1;
-};
-
typedef struct _MetaCompScreen
{
MetaScreen *screen;
@@ -443,15 +410,8 @@ mutter_window_constructed (GObject *object)
if (mutter_window_has_shadow (self))
{
- priv->shadow =
- tidy_texture_frame_new (CLUTTER_TEXTURE (compositor->shadow_src),
- MAX_TILE_SZ,
- MAX_TILE_SZ,
- MAX_TILE_SZ,
- MAX_TILE_SZ);
-
- clutter_actor_set_position (priv->shadow,
- SHADOW_OFFSET_X , SHADOW_OFFSET_Y);
+ priv->shadow = mutter_create_shadow_frame (compositor);
+
clutter_container_add_actor (CLUTTER_CONTAINER (self), priv->shadow);
}
@@ -581,15 +541,7 @@ mutter_window_set_property (GObject *object,
clutter_actor_get_size (CLUTTER_ACTOR (mw), &w, &h);
- priv->shadow =
- tidy_texture_frame_new (CLUTTER_TEXTURE (compositor->shadow_src),
- MAX_TILE_SZ,
- MAX_TILE_SZ,
- MAX_TILE_SZ,
- MAX_TILE_SZ);
-
- clutter_actor_set_position (priv->shadow,
- SHADOW_OFFSET_X , SHADOW_OFFSET_Y);
+ priv->shadow = mutter_create_shadow_frame (compositor);
clutter_actor_set_size (priv->shadow, w, h);
@@ -2539,7 +2491,6 @@ meta_compositor_new (MetaDisplay *display)
Atom atoms[G_N_ELEMENTS(atom_names)];
MetaCompositor *compositor;
Display *xdisplay = meta_display_get_xdisplay (display);
- guchar *data;
if (!composite_at_least_version (display, 0, 3))
return NULL;
@@ -2559,23 +2510,6 @@ meta_compositor_new (MetaDisplay *display)
compositor->atom_x_set_root = atoms[1];
compositor->atom_net_wm_window_opacity = atoms[2];
- /* Shadow setup */
-
- data = shadow_gaussian_make_tile ();
-
- compositor->shadow_src = clutter_texture_new ();
-
- clutter_texture_set_from_rgb_data (CLUTTER_TEXTURE (compositor->shadow_src),
- data,
- TRUE,
- TILE_WIDTH,
- TILE_HEIGHT,
- TILE_WIDTH*4,
- 4,
- 0,
- NULL);
- free (data);
-
return compositor;
}
@@ -2586,300 +2520,3 @@ mutter_get_overlay_window (MetaScreen *screen)
return info->output;
}
-
-
-/* ------------------------------- */
-/* Shadow Generation */
-
-typedef struct GaussianMap
-{
- int size;
- double * data;
-} GaussianMap;
-
-static double
-gaussian (double r, double x, double y)
-{
- return ((1 / (sqrt (2 * M_PI * r))) *
- exp ((- (x * x + y * y)) / (2 * r * r)));
-}
-
-
-static GaussianMap *
-make_gaussian_map (double r)
-{
- GaussianMap *c;
- int size = ((int) ceil ((r * 3)) + 1) & ~1;
- int center = size / 2;
- int x, y;
- double t = 0.0;
- double g;
-
- c = malloc (sizeof (GaussianMap) + size * size * sizeof (double));
- c->size = size;
-
- c->data = (double *) (c + 1);
-
- for (y = 0; y < size; y++)
- for (x = 0; x < size; x++)
- {
- g = gaussian (r, (double) (x - center), (double) (y - center));
- t += g;
- c->data[y * size + x] = g;
- }
-
- for (y = 0; y < size; y++)
- for (x = 0; x < size; x++)
- c->data[y*size + x] /= t;
-
- return c;
-}
-
-static unsigned char
-sum_gaussian (GaussianMap * map, double opacity,
- int x, int y, int width, int height)
-{
- int fx, fy;
- double * g_data;
- double * g_line = map->data;
- int g_size = map->size;
- int center = g_size / 2;
- int fx_start, fx_end;
- int fy_start, fy_end;
- double v;
- unsigned int r;
-
- /*
- * Compute set of filter values which are "in range",
- * that's the set with:
- * 0 <= x + (fx-center) && x + (fx-center) < width &&
- * 0 <= y + (fy-center) && y + (fy-center) < height
- *
- * 0 <= x + (fx - center) x + fx - center < width
- * center - x <= fx fx < width + center - x
- */
-
- fx_start = center - x;
- if (fx_start < 0)
- fx_start = 0;
- fx_end = width + center - x;
- if (fx_end > g_size)
- fx_end = g_size;
-
- fy_start = center - y;
- if (fy_start < 0)
- fy_start = 0;
- fy_end = height + center - y;
- if (fy_end > g_size)
- fy_end = g_size;
-
- g_line = g_line + fy_start * g_size + fx_start;
-
- v = 0;
- for (fy = fy_start; fy < fy_end; fy++)
- {
- g_data = g_line;
- g_line += g_size;
-
- for (fx = fx_start; fx < fx_end; fx++)
- v += *g_data++;
- }
- if (v > 1)
- v = 1;
-
- v *= (opacity * 255.0);
-
- r = (unsigned int) v;
-
- return (unsigned char) r;
-}
-
-static unsigned char *
-shadow_gaussian_make_tile ()
-{
- unsigned char * data;
- int size;
- int center;
- int x, y;
- unsigned char d;
- int pwidth, pheight;
- double opacity = SHADOW_OPACITY;
- static GaussianMap * gaussian_map = NULL;
-
- struct _mypixel
- {
- unsigned char r;
- unsigned char g;
- unsigned char b;
- unsigned char a;
- } * _d;
-
-
- if (!gaussian_map)
- gaussian_map =
- make_gaussian_map (SHADOW_RADIUS);
-
- size = gaussian_map->size;
- center = size / 2;
-
- /* Top & bottom */
-
- pwidth = MAX_TILE_SZ;
- pheight = MAX_TILE_SZ;
-
- data = g_malloc0 (4 * TILE_WIDTH * TILE_HEIGHT);
-
- _d = (struct _mypixel*) data;
-
- /* N */
- for (y = 0; y < pheight; y++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- center, y - center,
- TILE_WIDTH, TILE_HEIGHT);
- for (x = 0; x < pwidth; x++)
- {
- _d[y*3*pwidth + x + pwidth].r = 0;
- _d[y*3*pwidth + x + pwidth].g = 0;
- _d[y*3*pwidth + x + pwidth].b = 0;
- _d[y*3*pwidth + x + pwidth].a = d;
- }
-
- }
-
- /* S */
- pwidth = MAX_TILE_SZ;
- pheight = MAX_TILE_SZ;
-
- for (y = 0; y < pheight; y++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- center, y - center,
- TILE_WIDTH, TILE_HEIGHT);
- for (x = 0; x < pwidth; x++)
- {
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].r = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].g = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].b = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].a = d;
- }
-
- }
-
-
- /* w */
- pwidth = MAX_TILE_SZ;
- pheight = MAX_TILE_SZ;
-
- for (x = 0; x < pwidth; x++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- x - center, center,
- TILE_WIDTH, TILE_HEIGHT);
- for (y = 0; y < pheight; y++)
- {
- _d[y*3*pwidth + 3*pwidth*pheight + x].r = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + x].g = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + x].b = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + x].a = d;
- }
-
- }
-
- /* E */
- for (x = 0; x < pwidth; x++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- x - center, center,
- TILE_WIDTH, TILE_HEIGHT);
- for (y = 0; y < pheight; y++)
- {
- _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].r = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].g = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].b = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].a = d;
- }
-
- }
-
- /* NW */
- pwidth = MAX_TILE_SZ;
- pheight = MAX_TILE_SZ;
-
- for (x = 0; x < pwidth; x++)
- for (y = 0; y < pheight; y++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- x-center, y-center,
- TILE_WIDTH, TILE_HEIGHT);
-
- _d[y*3*pwidth + x].r = 0;
- _d[y*3*pwidth + x].g = 0;
- _d[y*3*pwidth + x].b = 0;
- _d[y*3*pwidth + x].a = d;
- }
-
- /* SW */
- for (x = 0; x < pwidth; x++)
- for (y = 0; y < pheight; y++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- x-center, y-center,
- TILE_WIDTH, TILE_HEIGHT);
-
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].r = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].g = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].b = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].a = d;
- }
-
- /* SE */
- for (x = 0; x < pwidth; x++)
- for (y = 0; y < pheight; y++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- x-center, y-center,
- TILE_WIDTH, TILE_HEIGHT);
-
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
- 2*pwidth].r = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
- 2*pwidth].g = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
- 2*pwidth].b = 0;
- _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
- 2*pwidth].a = d;
- }
-
- /* NE */
- for (x = 0; x < pwidth; x++)
- for (y = 0; y < pheight; y++)
- {
- d = sum_gaussian (gaussian_map, opacity,
- x-center, y-center,
- TILE_WIDTH, TILE_HEIGHT);
-
- _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].r = 0;
- _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].g = 0;
- _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].b = 0;
- _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].a = d;
- }
-
- /* center */
- pwidth = MAX_TILE_SZ;
- pheight = MAX_TILE_SZ;
-
- d = sum_gaussian (gaussian_map, opacity,
- center, center, TILE_WIDTH, TILE_HEIGHT);
-
- for (x = 0; x < pwidth; x++)
- for (y = 0; y < pheight; y++)
- {
- _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].r = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].g = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].b = 0;
- _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].a = 0;
- }
-
- return data;
-}
diff --git a/src/compositor/shadow.c b/src/compositor/shadow.c
new file mode 100644
index 0000000..b204440
--- /dev/null
+++ b/src/compositor/shadow.c
@@ -0,0 +1,350 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+#define _GNU_SOURCE /* For M_PI */
+
+#include <math.h>
+
+#include "compositor-private.h"
+#include "shadow.h"
+#include "tidy/tidy-texture-frame.h"
+
+#define SHADOW_RADIUS 8
+#define SHADOW_OPACITY 0.9
+#define SHADOW_OFFSET_X (SHADOW_RADIUS)
+#define SHADOW_OFFSET_Y (SHADOW_RADIUS)
+
+#define MAX_TILE_SZ 8 /* Must be <= shaddow radius */
+#define TILE_WIDTH (3*MAX_TILE_SZ)
+#define TILE_HEIGHT (3*MAX_TILE_SZ)
+
+static unsigned char* shadow_gaussian_make_tile (void);
+
+ClutterActor *
+mutter_create_shadow_frame (MetaCompositor *compositor)
+{
+ ClutterActor *frame;
+
+ if (!compositor->shadow_src)
+ {
+ guchar *data;
+
+ data = shadow_gaussian_make_tile ();
+
+ compositor->shadow_src = clutter_texture_new ();
+
+ clutter_texture_set_from_rgb_data (CLUTTER_TEXTURE (compositor->shadow_src),
+ data,
+ TRUE,
+ TILE_WIDTH,
+ TILE_HEIGHT,
+ TILE_WIDTH*4,
+ 4,
+ 0,
+ NULL);
+ g_free (data);
+ }
+
+ frame = tidy_texture_frame_new (CLUTTER_TEXTURE (compositor->shadow_src),
+ MAX_TILE_SZ,
+ MAX_TILE_SZ,
+ MAX_TILE_SZ,
+ MAX_TILE_SZ);
+
+ clutter_actor_set_position (frame,
+ SHADOW_OFFSET_X , SHADOW_OFFSET_Y);
+
+ return frame;
+}
+
+typedef struct GaussianMap
+{
+ int size;
+ double * data;
+} GaussianMap;
+
+static double
+gaussian (double r, double x, double y)
+{
+ return ((1 / (sqrt (2 * M_PI * r))) *
+ exp ((- (x * x + y * y)) / (2 * r * r)));
+}
+
+
+static GaussianMap *
+make_gaussian_map (double r)
+{
+ GaussianMap *c;
+ int size = ((int) ceil ((r * 3)) + 1) & ~1;
+ int center = size / 2;
+ int x, y;
+ double t = 0.0;
+ double g;
+
+ c = g_malloc (sizeof (GaussianMap) + size * size * sizeof (double));
+ c->size = size;
+
+ c->data = (double *) (c + 1);
+
+ for (y = 0; y < size; y++)
+ for (x = 0; x < size; x++)
+ {
+ g = gaussian (r, (double) (x - center), (double) (y - center));
+ t += g;
+ c->data[y * size + x] = g;
+ }
+
+ for (y = 0; y < size; y++)
+ for (x = 0; x < size; x++)
+ c->data[y*size + x] /= t;
+
+ return c;
+}
+
+static unsigned char
+sum_gaussian (GaussianMap * map, double opacity,
+ int x, int y, int width, int height)
+{
+ int fx, fy;
+ double * g_data;
+ double * g_line = map->data;
+ int g_size = map->size;
+ int center = g_size / 2;
+ int fx_start, fx_end;
+ int fy_start, fy_end;
+ double v;
+ unsigned int r;
+
+ /*
+ * Compute set of filter values which are "in range",
+ * that's the set with:
+ * 0 <= x + (fx-center) && x + (fx-center) < width &&
+ * 0 <= y + (fy-center) && y + (fy-center) < height
+ *
+ * 0 <= x + (fx - center) x + fx - center < width
+ * center - x <= fx fx < width + center - x
+ */
+
+ fx_start = center - x;
+ if (fx_start < 0)
+ fx_start = 0;
+ fx_end = width + center - x;
+ if (fx_end > g_size)
+ fx_end = g_size;
+
+ fy_start = center - y;
+ if (fy_start < 0)
+ fy_start = 0;
+ fy_end = height + center - y;
+ if (fy_end > g_size)
+ fy_end = g_size;
+
+ g_line = g_line + fy_start * g_size + fx_start;
+
+ v = 0;
+ for (fy = fy_start; fy < fy_end; fy++)
+ {
+ g_data = g_line;
+ g_line += g_size;
+
+ for (fx = fx_start; fx < fx_end; fx++)
+ v += *g_data++;
+ }
+ if (v > 1)
+ v = 1;
+
+ v *= (opacity * 255.0);
+
+ r = (unsigned int) v;
+
+ return (unsigned char) r;
+}
+
+static unsigned char *
+shadow_gaussian_make_tile ()
+{
+ unsigned char * data;
+ int size;
+ int center;
+ int x, y;
+ unsigned char d;
+ int pwidth, pheight;
+ double opacity = SHADOW_OPACITY;
+ static GaussianMap * gaussian_map = NULL;
+
+ struct _mypixel
+ {
+ unsigned char r;
+ unsigned char g;
+ unsigned char b;
+ unsigned char a;
+ } * _d;
+
+
+ if (!gaussian_map)
+ gaussian_map =
+ make_gaussian_map (SHADOW_RADIUS);
+
+ size = gaussian_map->size;
+ center = size / 2;
+
+ /* Top & bottom */
+
+ pwidth = MAX_TILE_SZ;
+ pheight = MAX_TILE_SZ;
+
+ data = g_malloc0 (4 * TILE_WIDTH * TILE_HEIGHT);
+
+ _d = (struct _mypixel*) data;
+
+ /* N */
+ for (y = 0; y < pheight; y++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ center, y - center,
+ TILE_WIDTH, TILE_HEIGHT);
+ for (x = 0; x < pwidth; x++)
+ {
+ _d[y*3*pwidth + x + pwidth].r = 0;
+ _d[y*3*pwidth + x + pwidth].g = 0;
+ _d[y*3*pwidth + x + pwidth].b = 0;
+ _d[y*3*pwidth + x + pwidth].a = d;
+ }
+
+ }
+
+ /* S */
+ pwidth = MAX_TILE_SZ;
+ pheight = MAX_TILE_SZ;
+
+ for (y = 0; y < pheight; y++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ center, y - center,
+ TILE_WIDTH, TILE_HEIGHT);
+ for (x = 0; x < pwidth; x++)
+ {
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].r = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].g = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].b = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].a = d;
+ }
+
+ }
+
+
+ /* w */
+ pwidth = MAX_TILE_SZ;
+ pheight = MAX_TILE_SZ;
+
+ for (x = 0; x < pwidth; x++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ x - center, center,
+ TILE_WIDTH, TILE_HEIGHT);
+ for (y = 0; y < pheight; y++)
+ {
+ _d[y*3*pwidth + 3*pwidth*pheight + x].r = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + x].g = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + x].b = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + x].a = d;
+ }
+
+ }
+
+ /* E */
+ for (x = 0; x < pwidth; x++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ x - center, center,
+ TILE_WIDTH, TILE_HEIGHT);
+ for (y = 0; y < pheight; y++)
+ {
+ _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].r = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].g = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].b = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].a = d;
+ }
+
+ }
+
+ /* NW */
+ pwidth = MAX_TILE_SZ;
+ pheight = MAX_TILE_SZ;
+
+ for (x = 0; x < pwidth; x++)
+ for (y = 0; y < pheight; y++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ x-center, y-center,
+ TILE_WIDTH, TILE_HEIGHT);
+
+ _d[y*3*pwidth + x].r = 0;
+ _d[y*3*pwidth + x].g = 0;
+ _d[y*3*pwidth + x].b = 0;
+ _d[y*3*pwidth + x].a = d;
+ }
+
+ /* SW */
+ for (x = 0; x < pwidth; x++)
+ for (y = 0; y < pheight; y++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ x-center, y-center,
+ TILE_WIDTH, TILE_HEIGHT);
+
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].r = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].g = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].b = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].a = d;
+ }
+
+ /* SE */
+ for (x = 0; x < pwidth; x++)
+ for (y = 0; y < pheight; y++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ x-center, y-center,
+ TILE_WIDTH, TILE_HEIGHT);
+
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
+ 2*pwidth].r = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
+ 2*pwidth].g = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
+ 2*pwidth].b = 0;
+ _d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
+ 2*pwidth].a = d;
+ }
+
+ /* NE */
+ for (x = 0; x < pwidth; x++)
+ for (y = 0; y < pheight; y++)
+ {
+ d = sum_gaussian (gaussian_map, opacity,
+ x-center, y-center,
+ TILE_WIDTH, TILE_HEIGHT);
+
+ _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].r = 0;
+ _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].g = 0;
+ _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].b = 0;
+ _d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].a = d;
+ }
+
+ /* center */
+ pwidth = MAX_TILE_SZ;
+ pheight = MAX_TILE_SZ;
+
+ d = sum_gaussian (gaussian_map, opacity,
+ center, center, TILE_WIDTH, TILE_HEIGHT);
+
+ for (x = 0; x < pwidth; x++)
+ for (y = 0; y < pheight; y++)
+ {
+ _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].r = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].g = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].b = 0;
+ _d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].a = 0;
+ }
+
+ return data;
+}
diff --git a/src/compositor/shadow.h b/src/compositor/shadow.h
new file mode 100644
index 0000000..3a1f902
--- /dev/null
+++ b/src/compositor/shadow.h
@@ -0,0 +1,9 @@
+#ifndef SHADOW_H
+#define SHADOW_H
+
+#include <clutter/clutter.h>
+#include "compositor.h"
+
+ClutterActor *mutter_create_shadow_frame (MetaCompositor *compositor);
+
+#endif /* SHADOW_H */
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