Minimal backport of #985 (rotated text baselines)

Automattic · Sep 7, 2017 · c19edb8 · c19edb8
1 parent 615f80e
commit c19edb8
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/src/CanvasRenderingContext2d.cc b/src/CanvasRenderingContext2d.cc
@@ -1794,18 +1794,20 @@ Context2d::setTextPath(const char *str, double x, double y) {
       break;
   }
 
+  double yScale = sqrt(matrix.yx * matrix.yx + matrix.yy * matrix.yy);
+
   switch (state->textBaseline) {
     case TEXT_BASELINE_ALPHABETIC:
       metrics = PANGO_LAYOUT_GET_METRICS(_layout);
-      y -= (pango_font_metrics_get_ascent(metrics) / PANGO_SCALE) * matrix.yy;
+      y -= (pango_font_metrics_get_ascent(metrics) / PANGO_SCALE) * yScale;
       break;
     case TEXT_BASELINE_MIDDLE:
       metrics = PANGO_LAYOUT_GET_METRICS(_layout);
-      y -= ((pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics))/(2.0 * PANGO_SCALE)) * matrix.yy;
+      y -= ((pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics))/(2.0 * PANGO_SCALE)) * yScale;
       break;
     case TEXT_BASELINE_BOTTOM:
       metrics = PANGO_LAYOUT_GET_METRICS(_layout);
-      y -= ((pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics)) / PANGO_SCALE) * matrix.yy;
+      y -= ((pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics)) / PANGO_SCALE) * yScale;
       break;
   }