Fix the bug of backface-visibility:hidden

[Title] Fix the bug of backface-visibility:hidden
[Issues] P130925-02172, P130925-02094
[Problem] Inspite of backface-visibility:hidden, backface of the element is visible.
[Solution] If the layer hasn't own 3D rendering context, m_state.visible of TextureMapperLayer should be inherited.

Change-Id: Ica79a79ec645f5c394e6b1bd143cc04bd5a35d31

diff --git a/Source/WebCore/platform/graphics/texmap/TextureMapperLayer.cpp b/Source/WebCore/platform/graphics/texmap/TextureMapperLayer.cpp
index 4e3aa24..703447d 100755 (executable)
--- a/Source/WebCore/platform/graphics/texmap/TextureMapperLayer.cpp
+++ b/Source/WebCore/platform/graphics/texmap/TextureMapperLayer.cpp
@@ -144,7 +144,9 @@ void TextureMapperLayer::computeTransformsRecursive()
     // Tizen backface culling algorithm ignores above line (common texturemapper style)
     m_state.visible = true;
 
-    if (!m_state.backfaceVisibility) {
+    if (m_parent && !m_parent->m_state.visible && !m_parent->m_state.preserves3D)
+        m_state.visible = false;
+    else if (!m_state.backfaceVisibility) {
         FloatQuad mappedLayer = m_transform.combined().mapQuad(FloatQuad(layerRect()));
         FloatSize horizontalDir = mappedLayer.p2() - mappedLayer.p1();
         FloatSize verticalDir = mappedLayer.p4() - mappedLayer.p1();