[gcompris/gcomprixogoo] Patched goocanvas to support scaling when witdth and height are changed.

[Bruno Coudoin <bcoudoin src gnome org>]

commit 8566cd58685a66da144dd59c1e58ea271eceb12f
Author: Bruno Coudoin <bruno coudoin free fr>
Date:   Sat Jul 4 10:37:44 2009 +0200

    Patched goocanvas to support scaling when witdth and height are changed.

 src/goocanvas/src/goocanvasimage.c |   28 ++++++++++++++++++++++------
 src/goocanvas/src/goocanvasimage.h |    2 +-
 2 files changed, 23 insertions(+), 7 deletions(-)
---
diff --git a/src/goocanvas/src/goocanvasimage.c b/src/goocanvas/src/goocanvasimage.c
index 4ee2426..497fbbc 100644
--- a/src/goocanvas/src/goocanvasimage.c
+++ b/src/goocanvas/src/goocanvasimage.c
@@ -129,9 +129,9 @@ goo_canvas_image_init (GooCanvasImage *image)
  * @x: the x coordinate of the image.
  * @y: the y coordinate of the image.
  * @...: optional pairs of property names and values, and a terminating %NULL.
- * 
+ *
  * Creates a new image item.
- * 
+ *
  * <!--PARAMETERS-->
  *
  * Here's an example showing how to create an image at (100.0, 100.0), using
@@ -169,6 +169,8 @@ goo_canvas_image_new (GooCanvasItem *parent,
       image_data->pattern = goo_canvas_cairo_pattern_from_pixbuf (pixbuf);
       image_data->width = gdk_pixbuf_get_width (pixbuf);
       image_data->height = gdk_pixbuf_get_height (pixbuf);
+      image_data->width_ref = image_data->width;
+      image_data->height_ref = image_data->height;
     }
 
   va_start (var_args, y);
@@ -298,6 +300,8 @@ goo_canvas_image_set_common_property (GObject              *object,
       image_data->pattern = pixbuf ? goo_canvas_cairo_pattern_from_pixbuf (pixbuf) : NULL;
       image_data->width = pixbuf ? gdk_pixbuf_get_width (pixbuf) : 0;
       image_data->height = pixbuf ? gdk_pixbuf_get_height (pixbuf) : 0;
+      image_data->width_ref = image_data->width;
+      image_data->height_ref = image_data->height;
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@@ -372,8 +376,15 @@ goo_canvas_image_paint (GooCanvasItemSimple   *simple,
   if (!image_data->pattern)
     return;
 
+  gdouble sx = image_data->width_ref / image_data->width;
+  gdouble sy = image_data->height_ref / image_data->height;
 #if 1
-  cairo_matrix_init_translate (&matrix, -image_data->x, -image_data->y);
+  cairo_matrix_init_translate (&matrix,
+			       -image_data->x * sx,
+			       -image_data->y * sy);
+  cairo_matrix_scale(&matrix,
+		     sx,
+		     sy);
   cairo_pattern_set_matrix (image_data->pattern, &matrix);
   goo_canvas_style_set_fill_options (simple->simple_data->style, cr);
   cairo_set_source (cr, image_data->pattern);
@@ -383,7 +394,12 @@ goo_canvas_image_paint (GooCanvasItemSimple   *simple,
 #else
   /* Using cairo_paint() used to be much slower than cairo_fill(), though
      they seem similar now. I'm not sure if it matters which we use. */
-  cairo_matrix_init_translate (&matrix, -image_data->x, -image_data->y);
+  cairo_matrix_init_translate (&matrix,
+			       -image_data->x,
+			       -image_data->y);
+  cairo_matrix_scale(&matrix,
+		     sx,
+		     sy);
   cairo_pattern_set_matrix (image_data->pattern, &matrix);
   goo_canvas_style_set_fill_options (simple->simple_data->style, cr);
   cairo_set_source (cr, image_data->pattern);
@@ -514,9 +530,9 @@ goo_canvas_image_model_init (GooCanvasImageModel *emodel)
  * @x: the x coordinate of the image.
  * @y: the y coordinate of the image.
  * @...: optional pairs of property names and values, and a terminating %NULL.
- * 
+ *
  * Creates a new image model.
- * 
+ *
  * <!--PARAMETERS-->
  *
  * Here's an example showing how to create an image at (100.0, 100.0), using
diff --git a/src/goocanvas/src/goocanvasimage.h b/src/goocanvas/src/goocanvasimage.h
index a97364f..8982ae8 100644
--- a/src/goocanvas/src/goocanvasimage.h
+++ b/src/goocanvas/src/goocanvasimage.h
@@ -18,8 +18,8 @@ typedef struct _GooCanvasImageData   GooCanvasImageData;
 struct _GooCanvasImageData
 {
   cairo_pattern_t *pattern;
-
   gdouble x, y, width, height;
+  gdouble width_ref, height_ref;
 };