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authorBehdad Esfahbod <behdad@behdad.org>2010-05-04 13:40:35 -0400
committerBehdad Esfahbod <behdad@behdad.org>2010-05-04 13:40:35 -0400
commit1caf2947f0941e2354dd4f43d56934e1ec706b6e (patch)
treef940d26338b4d2d9698f0cf68ea7e4d7f65f34a3 /pango/pangocairo-font.c
parent34e05035af0ce854df1cc2f77c0b11dbc1a3cb36 (diff)
downloadpango-1caf2947f0941e2354dd4f43d56934e1ec706b6e.tar.gz
[cairo] Scale font metrics to user space
Bug 457990 - font metrics are not converted to user space in cairo backend
Diffstat (limited to 'pango/pangocairo-font.c')
-rw-r--r--pango/pangocairo-font.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/pango/pangocairo-font.c b/pango/pangocairo-font.c
index ace2a575..1f6382b8 100644
--- a/pango/pangocairo-font.c
+++ b/pango/pangocairo-font.c
@@ -22,6 +22,7 @@
#include "config.h"
#include <math.h>
+#include <string.h>
#include "pangocairo.h"
#include "pangocairo-private.h"
@@ -266,6 +267,10 @@ _pango_cairo_font_get_metrics (PangoFont *font,
PangoLayout *layout;
PangoRectangle extents;
PangoFontDescription *desc;
+ cairo_scaled_font_t *scaled_font;
+ cairo_matrix_t cairo_matrix;
+ PangoMatrix pango_matrix;
+ PangoMatrix identity = PANGO_MATRIX_INIT;
int height, shift;
@@ -281,17 +286,45 @@ _pango_cairo_font_get_metrics (PangoFont *font,
info->sample_str = sample_str;
+ scaled_font = _pango_cairo_font_private_get_scaled_font (cf_priv);
+
context = pango_font_map_create_context (fontmap);
pango_context_set_language (context, language);
+
font_options = cairo_font_options_create ();
- cairo_scaled_font_get_font_options (_pango_cairo_font_private_get_scaled_font (cf_priv), font_options);
+ cairo_scaled_font_get_font_options (scaled_font, font_options);
pango_cairo_context_set_font_options (context, font_options);
cairo_font_options_destroy (font_options);
info->metrics = (* PANGO_CAIRO_FONT_GET_IFACE (font)->create_base_metrics_for_context) (cfont, context);
- /* Update approximate_*_width now */
+ /* We now need to adjust the base metrics for ctm */
+ cairo_scaled_font_get_ctm (scaled_font, &cairo_matrix);
+ pango_matrix.xx = cairo_matrix.xx;
+ pango_matrix.yx = cairo_matrix.yx;
+ pango_matrix.xy = cairo_matrix.xy;
+ pango_matrix.yy = cairo_matrix.yy;
+ pango_matrix.x0 = 0;
+ pango_matrix.y0 = 0;
+ if (G_UNLIKELY (0 != memcmp (&identity, &pango_matrix, 4 * sizeof (double))))
+ {
+ double xscale = pango_matrix_get_font_scale_factor (&pango_matrix);
+ if (xscale) xscale = 1 / xscale;
+
+ info->metrics->ascent *= xscale;
+ info->metrics->descent *= xscale;
+ info->metrics->underline_position *= xscale;
+ info->metrics->underline_thickness *= xscale;
+ info->metrics->strikethrough_position *= xscale;
+ info->metrics->strikethrough_thickness *= xscale;
+ }
+
+ /* Set the matrix on the context so we don't have to adjust the derived
+ * metrics. */
+ pango_context_set_matrix (context, &pango_matrix);
+
+ /* Update approximate_*_width now */
layout = pango_layout_new (context);
desc = pango_font_describe_with_absolute_size (font);
pango_layout_set_font_description (layout, desc);