Fix RTL text rendering in the QVGPaintEngine

The QVGPaintEngine calls vgDrawGlyphs() to draw the glyphs of a
QTextItem. vgDrawGlyphs(), which is an official OpenVG function, and
not implemented in Qt itself, expects glyphs coordinates differently
than Qt's glyph painting loops of other paint engines expect.

Therefore, we need to handle RTL text separately in
QVGPaintEngine::drawTextItem(). Rhys Weatherley provided this patch.
This issue is not Symbian specific, but rather QVGPaintEngine
specific.

Task-number: QT-3140
Reviewed-by: Rhys Weatherley

1 files changed, 7 insertions, 2 deletions

diff --git a/src/openvg/qpaintengine_vg.cpp b/src/openvg/qpaintengine_vg.cpp
index 96e0e86..7445fd7 100644
--- a/src/openvg/qpaintengine_vg.cpp
+++ b/src/openvg/qpaintengine_vg.cpp
@@ -3347,8 +3347,13 @@ void QVGPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)
     // Draw the glyphs.  We need to fill with the brush associated with
     // the Qt pen, not the Qt brush.
     d->ensureBrush(state()->pen.brush());
-    vgDrawGlyphs(glyphCache->font, glyphs.size(), (VGuint*)glyphs.data(),
-                 NULL, NULL, VG_FILL_PATH, VG_TRUE);
+    if (ti.renderFlags() & QTextItem::RightToLeft) {
+        for (int index = glyphs.size() - 1; index >= 0; --index)
+            vgDrawGlyph(glyphCache->font, glyphs[index], VG_FILL_PATH, VG_TRUE);
+    } else {
+        vgDrawGlyphs(glyphCache->font, glyphs.size(), (VGuint*)glyphs.data(),
+                     NULL, NULL, VG_FILL_PATH, VG_TRUE);
+    }
 #else
     // OpenGL 1.0 does not have support for VGFont and glyphs,
     // so fall back to the default Qt path stroking algorithm.