X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=libdocument%2Fev-document-misc.c;h=14bc3a354a3d86cd122293499fecf7e1e91020b9;hb=f9c2880d31bb2f5d4411849b9207c5d26a5c616a;hp=3e85c7dd2c7ce6099bd4e942ab1ce0c593a1c9c7;hpb=a953c6011f2fba7441758469118a886a33458e50;p=evince.git

diff --git a/libdocument/ev-document-misc.c b/libdocument/ev-document-misc.c
index 3e85c7dd..14bc3a35 100644
--- a/libdocument/ev-document-misc.c
+++ b/libdocument/ev-document-misc.c
@@ -1,4 +1,5 @@
 /*
+ *  Copyright (C) 2009 Juanjo Marín <juanj.marin@juntadeandalucia.es>
  *  Copyright (c) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
  *  Copyright (C) 2000-2003 Marco Pesenti Gritti
  *
@@ -17,10 +18,14 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-#include "ev-document-misc.h"
+#include <config.h>
+
 #include <string.h>
+
 #include <gtk/gtk.h>
 
+#include "ev-document-misc.h"
+
 /* Returns a new GdkPixbuf that is suitable for placing in the thumbnail view.
  * It is four pixels wider and taller than the source.  If source_pixbuf is not
  * NULL, then it will fill the return pixbuf with the contents of
@@ -151,8 +156,9 @@ ev_document_misc_surface_from_pixbuf (GdkPixbuf *pixbuf)
 {
 	cairo_surface_t *surface;
 	cairo_t         *cr;
-	
-	surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
+
+	surface = cairo_image_surface_create (gdk_pixbuf_get_has_alpha (pixbuf) ?
+					      CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
 					      gdk_pixbuf_get_width (pixbuf),
 					      gdk_pixbuf_get_height (pixbuf));
 	cr = cairo_create (surface);
@@ -218,10 +224,10 @@ ev_document_misc_pixbuf_from_surface (cairo_surface_t *surface)
 			p[3] = (has_alpha) ? p[3] : 0xff;
 #else
 			tmp = p[0];
-			p[0] = (has_alpha) ? p[3] : 0xff;
-			p[3] = p[2];
-			p[2] = p[1];
-			p[1] = tmp;
+			p[0] = p[1];
+			p[1] = p[2];
+			p[2] = p[3];
+			p[3] = (has_alpha) ? tmp : 0xff;
 #endif			
 			p += pixbuf_n_channels;
 		}
@@ -239,8 +245,6 @@ ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
 	cairo_surface_t *new_surface;
 	cairo_t         *cr;
 	gint             width, height;
-	gboolean         has_alpha;
-	cairo_format_t   surface_format;
 	gint             new_width = dest_width;
 	gint             new_height = dest_height;
 
@@ -258,13 +262,8 @@ ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
 		new_height = dest_width;
 	}
 
-	surface_format = cairo_image_surface_get_format (surface);
-	has_alpha = (surface_format == CAIRO_FORMAT_ARGB32);
-
 	new_surface = cairo_surface_create_similar (surface,
-						    has_alpha ?
-						    CAIRO_CONTENT_COLOR_ALPHA :
-						    CAIRO_CONTENT_COLOR,
+						    cairo_surface_get_content (surface),
 						    new_width, new_height);
 
 	cr = cairo_create (new_surface);
@@ -296,4 +295,71 @@ ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
 
 	return new_surface;
 }
-	
+
+void
+ev_document_misc_invert_surface (cairo_surface_t *surface) {
+#if CAIRO_VERSION > CAIRO_VERSION_ENCODE(1, 9, 2)
+	cairo_t *cr;
+
+	cr = cairo_create (surface);
+
+	/* white + DIFFERENCE -> invert */
+	cairo_set_operator (cr, CAIRO_OPERATOR_DIFFERENCE);
+	cairo_set_source_rgb (cr, 1., 1., 1.);
+	cairo_paint(cr);
+	cairo_destroy (cr);
+#else
+	guchar *data;
+	gint    rowstride;
+	gint    width, height;
+	gint    x, y;
+
+	data = cairo_image_surface_get_data (surface);
+	rowstride = cairo_image_surface_get_stride (surface);
+	width = cairo_image_surface_get_width (surface);
+	height = cairo_image_surface_get_height (surface);
+
+	for (y = 0; y < height; y++) {
+		guchar *p = data + y * rowstride;
+
+		for (x = 0; x < width; x++) {
+			p[0] = 255 - p[0];
+			p[1] = 255 - p[1];
+			p[2] = 255 - p[2];
+			p += 4;
+		}
+	}
+
+	cairo_surface_mark_dirty (surface);
+#endif
+}
+
+void
+ev_document_misc_invert_pixbuf (GdkPixbuf *pixbuf)
+{
+	guchar *data, *p;
+	guint   width, height, x, y, rowstride, n_channels;
+
+	n_channels = gdk_pixbuf_get_n_channels (pixbuf);
+	g_assert (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB);
+	g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);
+
+	/* First grab a pointer to the raw pixel data. */
+	data = gdk_pixbuf_get_pixels (pixbuf);
+
+	/* Find the number of bytes per row (could be padded). */
+	rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+
+	width = gdk_pixbuf_get_width (pixbuf);
+	height = gdk_pixbuf_get_height (pixbuf);
+	for (x = 0; x < width; x++) {
+		for (y = 0; y < height; y++) {
+			/* Calculate pixel's offset into the data array. */
+			p = data + x * n_channels + y * rowstride;
+			/* Change the RGB values*/
+			p[0] = 255 - p[0];
+			p[1] = 255 - p[1];
+			p[2] = 255 - p[2];
+		}
+	}
+}