[goffice] GOPattern: fix svg scaling.

[Morten Welinder <mortenw src gnome org>]

commit e08c6cd0095913988a7b369ab3429edc87ac2072
Author: Morten Welinder <terra gnome org>
Date:   Thu Apr 2 21:00:49 2015 -0400

    GOPattern: fix svg scaling.
    
    We must not depend on the coordinate system used in the svg file.
    This scales everything to a given target size.

 ChangeLog                  |    1 +
 goffice/utils/go-pattern.c |   13 ++++++-------
 2 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index fb05ed9..a36d858 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@
        * goffice/utils/go-pattern.c (go_pattern_create_cairo_pattern): Do
        2 colour translations instead of 64.  Split submethods into
        separate functions.
+       (svg_pattern): Fix scaling.
 
 2015-04-01  Jean Brefort  <jean brefort normalesup org>
 
diff --git a/goffice/utils/go-pattern.c b/goffice/utils/go-pattern.c
index c75d12f..ae32024 100644
--- a/goffice/utils/go-pattern.c
+++ b/goffice/utils/go-pattern.c
@@ -313,7 +313,7 @@ legacy_pattern (GOPattern const *pattern, cairo_t *cr)
 static cairo_pattern_t *
 svg_pattern (GOPattern const *pattern, cairo_t *cr)
 {
-       double SVG_PATTERN_SCALE = 2.0;
+       int target_size = 16;
        cairo_t *cr_tmp;
        xmlChar *svg_path;
        double width, height;
@@ -324,8 +324,7 @@ svg_pattern (GOPattern const *pattern, cairo_t *cr)
 
        cr_surface = cairo_surface_create_similar (cairo_get_target (cr),
                                                   CAIRO_CONTENT_COLOR_ALPHA,
-                                                  width * SVG_PATTERN_SCALE,
-                                                  height * SVG_PATTERN_SCALE);
+                                                  target_size, target_size);
 
        cr_tmp = cairo_create (cr_surface);
 
@@ -333,9 +332,9 @@ svg_pattern (GOPattern const *pattern, cairo_t *cr)
        cairo_paint (cr_tmp);
 
        cairo_set_source_rgba (cr_tmp, GO_COLOR_TO_CAIRO (pattern->fore));
-       cairo_scale (cr_tmp, SVG_PATTERN_SCALE, SVG_PATTERN_SCALE);
+       cairo_scale (cr_tmp, target_size / width, target_size / height);
        go_cairo_emit_svg_path (cr_tmp, svg_path);
-       cairo_set_line_width (cr_tmp, 0.2);
+       cairo_set_line_width (cr_tmp, 0.01);
        cairo_fill (cr_tmp);
 
        cairo_destroy (cr_tmp);
@@ -354,8 +353,8 @@ svg_pattern (GOPattern const *pattern, cairo_t *cr)
  * @pattern: a #GOPattern
  * @cr: a cairo context
  *
- * Returns: a cairo pattern object corresponding to @pattern parameters. The returned
- *     surface must be freed after use, using cairo_pattern_destroy.
+ * Returns: (transfer full): a cairo pattern object corresponding to @pattern
+ * parameters.
  **/
 cairo_pattern_t *
 go_pattern_create_cairo_pattern (GOPattern const *pattern, cairo_t *cr)