Nikolay Sivov : dwrite: Scale strikethrough thickness and position with current font size.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 943fb2c071049c2f17358c4df5d54a6e4c5d0ee7
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=943fb2c071049c2f17358c4df5d54a6e4c5d0ee7

Author: Nikolay Sivov <nsivov at codeweavers.com>
Date:   Thu Jan 14 01:04:54 2016 +0300

dwrite: Scale strikethrough thickness and position with current font size.

Signed-off-by: Nikolay Sivov <nsivov at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/dwrite/layout.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/dlls/dwrite/layout.c b/dlls/dwrite/layout.c
index daa56e9..943fef9 100644
--- a/dlls/dwrite/layout.c
+++ b/dlls/dwrite/layout.c
@@ -651,10 +651,7 @@ static void layout_set_cluster_metrics(struct dwrite_textlayout *layout, const s
     }
 }
 
-static inline FLOAT get_scaled_font_metric(UINT32 metric, FLOAT emSize, const DWRITE_FONT_METRICS *metrics)
-{
-    return (FLOAT)metric * emSize / (FLOAT)metrics->designUnitsPerEm;
-}
+#define SCALE_FONT_METRIC(metric, emSize, metrics) ((FLOAT)(metric) * (emSize) / (FLOAT)(metrics)->designUnitsPerEm)
 
 static HRESULT layout_compute_runs(struct dwrite_textlayout *layout)
 {
@@ -878,8 +875,8 @@ static HRESULT layout_compute_runs(struct dwrite_textlayout *layout)
         else
             IDWriteFontFace_GetMetrics(run->run.fontFace, &fontmetrics);
 
-        r->baseline = get_scaled_font_metric(fontmetrics.ascent, run->run.fontEmSize, &fontmetrics);
-        r->height = get_scaled_font_metric(fontmetrics.ascent + fontmetrics.descent, run->run.fontEmSize, &fontmetrics);
+        r->baseline = SCALE_FONT_METRIC(fontmetrics.ascent, run->run.fontEmSize, &fontmetrics);
+        r->height = SCALE_FONT_METRIC(fontmetrics.ascent + fontmetrics.descent, run->run.fontEmSize, &fontmetrics);
 
         layout_set_cluster_metrics(layout, r, &cluster);
 
@@ -1135,8 +1132,9 @@ static HRESULT layout_add_effective_run(struct dwrite_textlayout *layout, const
             IDWriteFontFace_GetMetrics(r->u.regular.run.fontFace, &metrics);
 
         s->s.width = get_cluster_range_width(layout, first_cluster, first_cluster + cluster_count);
-        s->s.thickness = metrics.strikethroughThickness;
-        s->s.offset = metrics.strikethroughPosition;
+        s->s.thickness = SCALE_FONT_METRIC(metrics.strikethroughThickness, r->u.regular.run.fontEmSize, &metrics);
+        /* Negative offset moves it above baseline as Y coordinate grows downward. */
+        s->s.offset = -SCALE_FONT_METRIC(metrics.strikethroughPosition, r->u.regular.run.fontEmSize, &metrics);
         s->s.readingDirection = layout->format.readingdir;
         s->s.flowDirection = layout->format.flow;
         s->s.localeName = r->u.regular.descr.localeName;