Add thumbnail support.

2004-12-22  Anders Carlsson  <andersca@gnome.org>

	* backend/Makefile.am:
	* backend/ev-document-thumbnails.c:
	(ev_document_thumbnails_get_type),
	(ev_document_thumbnails_get_thumbnail):
	* backend/ev-document-thumbnails.h:
	* pixbuf/pixbuf-document.c: (G_DEFINE_TYPE_WITH_CODE),
	(pixbuf_document_thumbnails_get_thumbnail),
	(pixbuf_document_document_thumbnails_iface_init):
	* shell/Makefile.am:
	* shell/ev-sidebar-thumbnails.c: (ev_sidebar_thumbnails_destroy),
	(ev_sidebar_thumbnails_class_init), (ev_sidebar_thumbnails_init),
	(populate_thumbnails), (ev_sidebar_thumbnails_set_document):
	* shell/ev-sidebar-thumbnails.h:
	* shell/ev-sidebar.c: (ev_sidebar_init), (ev_sidebar_add_page),
	(ev_sidebar_set_document):
	* shell/ev-utils.c: (gaussian), (create_blur_filter),
	(create_shadow), (ev_pixbuf_add_shadow):
	* shell/ev-utils.h:
	Add thumbnail support.

1 files changed, 179 insertions, 0 deletions

diff --git a/shell/ev-utils.c b/shell/ev-utils.c
new file mode 100644
index 0000000..cf8a67c
--- /dev/null
+++ b/shell/ev-utils.c
@@ -0,0 +1,179 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
+/*
+ *  Copyright (C) 2004 Anders Carlsson <andersca@gnome.org>
+ *
+ *  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, 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, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include "ev-utils.h"
+#include <math.h>
+
+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 GdkPixbuf *
+create_shadow (GdkPixbuf *src, int blur_radius,
+	       int x_offset, int y_offset, double opacity)
+{
+  int x, y, i, j;
+  int width, height;
+  GdkPixbuf *dest;
+  static ConvFilter *filter = NULL;
+  int src_rowstride, dest_rowstride;
+  int src_bpp, dest_bpp;
+  
+  guchar *src_pixels, *dest_pixels;
+
+  if (!filter)
+    filter = create_blur_filter (blur_radius);
+
+  if (x_offset < 0)
+	  x_offset = (blur_radius * 4) / 5;
+  
+  if (y_offset < 0)
+	  y_offset = (blur_radius * 4) / 5;
+
+  
+  width = gdk_pixbuf_get_width (src) + blur_radius * 2 + x_offset;
+  height = gdk_pixbuf_get_height (src) + blur_radius * 2 + y_offset;
+
+  dest = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (src), TRUE,
+			 gdk_pixbuf_get_bits_per_sample (src),
+			 width, height);
+  gdk_pixbuf_fill (dest, 0);  
+  src_pixels = gdk_pixbuf_get_pixels (src);
+  src_rowstride = gdk_pixbuf_get_rowstride (src);
+  src_bpp = gdk_pixbuf_get_has_alpha (src) ? 4 : 3;
+  
+  dest_pixels = gdk_pixbuf_get_pixels (dest);
+  dest_rowstride = gdk_pixbuf_get_rowstride (dest);
+  dest_bpp = gdk_pixbuf_get_has_alpha (dest) ? 4 : 3;
+  
+  for (y = 0; y < height; y++)
+    {
+      for (x = 0; x < width; x++)
+	{
+	  int sumr = 0, sumg = 0, sumb = 0, suma = 0;
+
+	  for (i = 0; i < filter->size; i++)
+	    {
+	      for (j = 0; j < filter->size; j++)
+		{
+		  int src_x, src_y;
+
+		  src_y = -(blur_radius + x_offset) + y - (filter->size >> 1) + i;
+		  src_x = -(blur_radius + y_offset) + x - (filter->size >> 1) + j;
+
+		  if (src_y < 0 || src_y > gdk_pixbuf_get_height (src) ||
+		      src_x < 0 || src_x > gdk_pixbuf_get_width (src))
+		    continue;
+
+		  sumr += src_pixels [src_y * src_rowstride +
+				      src_x * src_bpp + 0] *
+		    filter->data [i * filter->size + j];
+		  sumg += src_pixels [src_y * src_rowstride +
+				      src_x * src_bpp + 1] * 
+		    filter->data [i * filter->size + j];
+
+		  sumb += src_pixels [src_y * src_rowstride +
+				      src_x * src_bpp + 2] * 
+		    filter->data [i * filter->size + j];
+		  
+		  if (src_bpp == 4)
+		    suma += src_pixels [src_y * src_rowstride +
+					src_x * src_bpp + 3] *
+		    filter->data [i * filter->size + j];
+		  else
+			  suma += 0xff;
+		    
+		}
+	    }
+
+	  if (dest_bpp == 4)
+	    dest_pixels [y * dest_rowstride +
+			 x * dest_bpp + 3] = (suma * opacity) / (filter->size * filter->size);
+
+	}
+    }
+  
+  return dest;
+}
+
+GdkPixbuf *
+ev_pixbuf_add_shadow (GdkPixbuf *src, int size,
+		      int x_offset, int y_offset, double opacity)
+{
+  GdkPixbuf *dest;
+  
+  dest = create_shadow (src, size, x_offset, y_offset, opacity);
+
+  gdk_pixbuf_composite (src, dest,
+			size, size,
+			gdk_pixbuf_get_width (src),
+			gdk_pixbuf_get_height (src),
+ 			size, size,
+			1.0, 1.0,
+			GDK_INTERP_NEAREST, 255);
+
+  return dest;
+}
+
+