Moved from Mate-Extra repository

1 files changed, 231 insertions, 0 deletions

diff --git a/mate-screenshot/screenshot-shadow.c b/mate-screenshot/screenshot-shadow.c
new file mode 100644
index 00000000..913429db
--- /dev/null
+++ b/mate-screenshot/screenshot-shadow.c
@@ -0,0 +1,231 @@
+/* screenshot-shadow.c - part of MATE Screenshot
+ *
+ * Copyright (C) 2001-2006  Jonathan Blandford <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ */
+
+/* Shadow code from anders */
+
+#include "screenshot-shadow.h"
+#include <math.h>
+
+#define BLUR_RADIUS    5
+#define SHADOW_OFFSET  (BLUR_RADIUS * 4 / 5)
+#define SHADOW_OPACITY 0.5
+
+#define OUTLINE_RADIUS  1
+#define OUTLINE_OFFSET  0
+#define OUTLINE_OPACITY 1.0
+
+#define dist(x0, y0, x1, y1) sqrt(((x0) - (x1))*((x0) - (x1)) + ((y0) - (y1))*((y0) - (y1)))
+
+typedef struct {
+  int size;
+  double *data;
+} ConvFilter;
+
+static double
+gaussian (double x, double y, double r)
+{
+    return ((1 / (2 * M_PI * r)) *
+	    exp ((- (x * x + y * y)) / (2 * r * r)));
+}
+
+static ConvFilter *
+create_blur_filter (int radius)
+{
+  ConvFilter *filter;
+  int x, y;
+  double sum;
+  
+  filter = g_new0 (ConvFilter, 1);
+  filter->size = radius * 2 + 1;
+  filter->data = g_new (double, filter->size * filter->size);
+
+  sum = 0.0;
+  
+  for (y = 0 ; y < filter->size; y++)
+    {
+      for (x = 0 ; x < filter->size; x++)
+	{
+	  sum += filter->data[y * filter->size + x] = gaussian (x - (filter->size >> 1),
+								y - (filter->size >> 1),
+								radius);
+	}
+    }
+
+  for (y = 0; y < filter->size; y++)
+    {
+      for (x = 0; x < filter->size; x++)
+	{
+	  filter->data[y * filter->size + x] /= sum;
+	}
+    }
+
+  return filter;
+  
+}
+
+static ConvFilter *
+create_outline_filter (int radius)
+{
+  ConvFilter *filter;
+  double *iter;
+  
+  filter = g_new0 (ConvFilter, 1);
+  filter->size = radius * 2 + 1;
+  filter->data = g_new (double, filter->size * filter->size);
+
+  for (iter = filter->data;
+       iter < filter->data + (filter->size * filter->size);
+       iter++)
+    {
+      *iter = 1.0;
+    }
+
+  return filter;
+}
+
+static GdkPixbuf *
+create_effect (GdkPixbuf *src,
+               ConvFilter const *filter,
+               int radius,
+               int offset,
+               double opacity)
+{
+  GdkPixbuf *dest;
+  int x, y, i, j;
+  int src_x, src_y;
+  int suma;
+  int dest_width, dest_height;
+  int src_width, src_height;
+  int src_rowstride, dest_rowstride;
+  gboolean src_has_alpha;
+  
+  guchar *src_pixels, *dest_pixels;
+
+  src_has_alpha =  gdk_pixbuf_get_has_alpha (src);
+
+  src_width = gdk_pixbuf_get_width (src);
+  src_height = gdk_pixbuf_get_height (src);
+  dest_width = src_width + 2 * radius + offset;
+  dest_height = src_height + 2 * radius + offset;
+
+  dest = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (src),
+			 TRUE,
+			 gdk_pixbuf_get_bits_per_sample (src),
+			 dest_width, dest_height);
+  
+  gdk_pixbuf_fill (dest, 0);  
+  
+  src_pixels = gdk_pixbuf_get_pixels (src);
+  src_rowstride = gdk_pixbuf_get_rowstride (src);
+  
+  dest_pixels = gdk_pixbuf_get_pixels (dest);
+  dest_rowstride = gdk_pixbuf_get_rowstride (dest);
+  
+  for (y = 0; y < dest_height; y++)
+    {
+      for (x = 0; x < dest_width; x++)
+	{
+	  suma = 0;
+
+	  src_x = x - radius;
+	  src_y = y - radius;
+
+	  /* We don't need to compute effect here, since this pixel will be 
+	   * discarded when compositing */
+	  if (src_x >= 0 && src_x < src_width &&
+	      src_y >= 0 && src_y < src_height && 
+	      (!src_has_alpha ||
+	       src_pixels [src_y * src_rowstride + src_x * 4 + 3] == 0xFF))
+	    continue;
+
+	  for (i = 0; i < filter->size; i++)
+	    {
+	      for (j = 0; j < filter->size; j++)
+		{
+		  src_y = -(radius + offset) + y - (filter->size >> 1) + i;
+		  src_x = -(radius + offset) + x - (filter->size >> 1) + j;
+
+		  if (src_y < 0 || src_y >= src_height ||
+		      src_x < 0 || src_x >= src_width)
+		    continue;
+
+		  suma += ( src_has_alpha ? 
+			    src_pixels [src_y * src_rowstride + src_x * 4 + 3] :
+			    0xFF ) * filter->data [i * filter->size + j];
+		}
+	    }
+
+	  dest_pixels [y * dest_rowstride + x * 4 + 3] = CLAMP (suma * opacity, 0x00, 0xFF);
+	}
+    }
+  
+  return dest;
+}
+
+void
+screenshot_add_shadow (GdkPixbuf **src)
+{
+  GdkPixbuf *dest;
+  static ConvFilter *filter = NULL;
+  
+  if (!filter)
+    filter = create_blur_filter (BLUR_RADIUS);
+  
+  dest = create_effect (*src, filter, 
+			BLUR_RADIUS,
+                        SHADOW_OFFSET, SHADOW_OPACITY);
+
+  if (dest == NULL)
+	  return;
+
+  gdk_pixbuf_composite (*src, dest,
+			BLUR_RADIUS, BLUR_RADIUS,
+			gdk_pixbuf_get_width (*src),
+			gdk_pixbuf_get_height (*src),
+			BLUR_RADIUS, BLUR_RADIUS, 1.0, 1.0,
+			GDK_INTERP_BILINEAR, 255);
+  g_object_unref (*src);
+  *src = dest;
+}
+
+void
+screenshot_add_border (GdkPixbuf **src)
+{
+  GdkPixbuf *dest;
+  static ConvFilter *filter = NULL;
+  
+  if (!filter)
+    filter = create_outline_filter (OUTLINE_RADIUS);
+  
+  dest = create_effect (*src, filter, 
+			OUTLINE_RADIUS,
+                        OUTLINE_OFFSET, OUTLINE_OPACITY);
+
+  if (dest == NULL)
+	  return;
+
+  gdk_pixbuf_composite (*src, dest,
+			OUTLINE_RADIUS, OUTLINE_RADIUS,
+			gdk_pixbuf_get_width (*src),
+			gdk_pixbuf_get_height (*src),
+			OUTLINE_RADIUS, OUTLINE_RADIUS, 1.0, 1.0,
+			GDK_INTERP_BILINEAR, 255);
+  g_object_unref (*src);
+  *src = dest;
+}