Fix bug #323540.

2005-12-12  Behdad Esfahbod  <behdad@gnome.org>

        Fix bug #323540.

        * pangofc-fontmap.c (get_scaled_size): The logic in there is moved
        and renamed into pango-utils.

        * pango/pango-types.h,
        * pango/pango-utils.c (pango_matrix_get_font_scale_factor):
        New function.

        * pango/pangocairo-fcfont.c (get_font_size): Divide pixel-size by
        matrix font-scale-factor, since pixel-size is scaled.

5 files changed, 77 insertions, 43 deletions

diff --git a/ChangeLog b/ChangeLog
index 21d8cdd9..19cb887b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2005-12-12  Behdad Esfahbod  <behdad@gnome.org>
+
+	Fix bug #323540.
+
+	* pangofc-fontmap.c (get_scaled_size): The logic in there is moved
+	and renamed into pango-utils.
+
+	* pango/pango-types.h, 
+	* pango/pango-utils.c (pango_matrix_get_font_scale_factor):
+	New function.
+
+	* pango/pangocairo-fcfont.c (get_font_size): Divide pixel-size by
+	matrix font-scale-factor, since pixel-size is scaled.
+
 2005-12-05  Behdad Esfahbod  <behdad@gnome.org>
 
 	* pango/pangofc-fontmap.c (pango_fc_font_map_finalize): Free
diff --git a/pango/pango-types.h b/pango/pango-types.h
index 1e3a0305..e01b8911 100644
--- a/pango/pango-types.h
+++ b/pango/pango-types.h
@@ -123,6 +123,7 @@ void pango_matrix_rotate    (PangoMatrix *matrix,
 			     double       degrees);
 void pango_matrix_concat    (PangoMatrix       *matrix,
 			     const PangoMatrix *new_matrix);
+double pango_matrix_get_font_scale_factor (PangoMatrix *matrix);
 
 #define PANGO_SCALE 1024
 #define PANGO_PIXELS(d) (((int)(d) + 512) >> 10)
diff --git a/pango/pango-utils.c b/pango/pango-utils.c
index 5a48f905..519b6bc1 100644
--- a/pango/pango-utils.c
+++ b/pango/pango-utils.c
@@ -1156,6 +1156,58 @@ pango_matrix_concat (PangoMatrix       *matrix,
   matrix->y0  = tmp.yx * new_matrix->y0 + tmp.yy * new_matrix->y0 + tmp.y0;
 }
 
+/**
+ * pango_matrix_get_font_scale_factor:
+ * @matrix: a #PangoMatrix, may be %NULL
+ * 
+ * Return value: the scale factor of @matrix on the height of the font.
+ * That is, the scale factor in the direction perpendicular to the
+ * vector that the X coordinate is mapped to, or 1.0 if @matrix is %NULL.
+ *
+ * Since: 1.12
+ **/
+double
+pango_matrix_get_font_scale_factor (PangoMatrix *matrix)
+{
+/*
+ * Based on cairo-matrix.c:_cairo_matrix_compute_scale_factors()
+ *
+ * Copyright 2005, Keith Packard
+ */
+  double det;
+  
+  if (!matrix)
+    return 1.0;
+  
+  det = matrix->xx * matrix->yy - matrix->yx * matrix->xy;
+
+  if (det == 0)
+    {
+      return 0.0;
+    }
+  else
+    {
+      double x = matrix->xx;
+      double y = matrix->yx;
+      double major, minor;
+
+      major = sqrt (x*x + y*y);
+      
+      /*
+       * ignore mirroring
+       */
+      if (det < 0)
+	det = - det;
+      
+      if (major)
+	minor = det / major;
+      else 
+	minor = 0.0;
+
+      return minor;
+    }
+}
+
 static const char canon_map[256] = {
    0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0, 
    0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0, 
diff --git a/pango/pangocairo-fcfont.c b/pango/pangocairo-fcfont.c
index 6e0a7d07..e7f1bd23 100644
--- a/pango/pangocairo-fcfont.c
+++ b/pango/pangocairo-fcfont.c
@@ -370,7 +370,8 @@ static double
 get_font_size (PangoCairoFcFontMap        *cffontmap,
 	       PangoContext               *context,
 	       const PangoFontDescription *desc,
-	       FcPattern                  *pattern)
+	       FcPattern                  *pattern,
+	       PangoMatrix                *matrix)
 {
   double size;
 
@@ -388,7 +389,7 @@ get_font_size (PangoCairoFcFontMap        *cffontmap,
   */
 
   if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &size) == FcResultMatch)
-    return size * PANGO_SCALE;
+    return size * PANGO_SCALE / pango_matrix_get_font_scale_factor (matrix);
 
   /* Just in case FC_PIXEL_SIZE got unset between pango_fc_make_pattern()
    * and here.
@@ -437,12 +438,13 @@ _pango_cairo_fc_font_new (PangoCairoFcFontMap        *cffontmap,
   else
     cairo_matrix_init_identity (&cffont->font_matrix);
 
-  size = get_font_size (cffontmap, context, desc, pattern);
+  pango_ctm = pango_context_get_matrix (context);
+
+  size = get_font_size (cffontmap, context, desc, pattern, pango_ctm);
 
   cairo_matrix_scale (&cffont->font_matrix,
 		      size / PANGO_SCALE, size / PANGO_SCALE);
 
-  pango_ctm = pango_context_get_matrix (context);
   if (pango_ctm)
     cairo_matrix_init (&cffont->ctm,
 		       pango_ctm->xx,
@@ -453,6 +455,7 @@ _pango_cairo_fc_font_new (PangoCairoFcFontMap        *cffontmap,
   else
     cairo_matrix_init_identity (&cffont->ctm);
 
+
   cffont->options = cairo_font_options_copy (_pango_cairo_context_get_merged_font_options (context));
   
   return PANGO_FC_FONT (cffont);
diff --git a/pango/pangofc-fontmap.c b/pango/pangofc-fontmap.c
index 86b9eb36..956d564f 100644
--- a/pango/pangofc-fontmap.c
+++ b/pango/pangofc-fontmap.c
@@ -1011,44 +1011,6 @@ get_unscaled_size (PangoFcFontMap             *fcfontmap,
     }
 }
 
-/*
- * Based on cairo-matrix.c:_cairo_matrix_compute_scale_factors()
- *
- * Copyright 2005, Keith Packard
- */
-static double
-get_scaled_size (FontsetHashKey *key)
-{
-  PangoMatrix *matrix = &key->matrix;
-  double det = matrix->xx * matrix->yy - matrix->yx * matrix->xy;
-
-  if (det == 0)
-    {
-      return 0.0;
-    }
-  else
-    {
-      double x = matrix->xx;
-      double y = matrix->yx;
-      double major, minor;
-
-      major = sqrt (x*x + y*y);
-      
-      /*
-       * ignore mirroring
-       */
-      if (det < 0)
-	det = - det;
-      
-      if (major)
-	minor = det / major;
-      else 
-	minor = 0.0;
-
-      return minor * key->size / 1024.;
-    }
-}
-
 static PangoFcPatternSet *
 pango_fc_font_map_get_patterns (PangoFontMap               *fontmap,
 				PangoContext               *context,
@@ -1083,8 +1045,10 @@ pango_fc_font_map_get_patterns (PangoFontMap               *fontmap,
 
   if (patterns == NULL)
     {
+      double scale_factor = pango_matrix_get_font_scale_factor (&key.matrix);
+      double scaled_size = key.size * scale_factor / PANGO_SCALE;
       pattern = pango_fc_make_pattern (desc, language,
-				       get_scaled_size (&key),
+				       scaled_size,
 				       pango_fc_font_map_get_resolution (fcfontmap, context));
       
       pango_fc_default_substitute (fcfontmap, context, pattern);