Added SetLayerTransform to PPAPI

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index 6894654d3db4f62dc46c0b073ef27158e58e30a4..7d8819cfce8b341032b0fc0efacd85cc81bbd5fe 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -1545,6 +1545,11 @@ bool PepperPluginInstanceImpl::LoadTextInputInterface() {
   return !!plugin_textinput_interface_;
 }
 
+void PepperPluginInstanceImpl::SetLayerTransform(gfx::Transform transform) {
+  transform_ = transform;
+  UpdateLayerTransform();
+}
+
 void PepperPluginInstanceImpl::UpdateLayerTransform() {
   if (!bound_graphics_2d_platform_ || !texture_layer_) {
     // Currently the transform is only applied for Graphics2D.
@@ -1564,11 +1569,26 @@ void PepperPluginInstanceImpl::UpdateLayerTransform() {
   gfx::Size plugin_size_in_dip(view_data_.rect.size.width,
                                view_data_.rect.size.height);
 
+  // Adding the SetLayerTransform from Graphics2D to the UV.
+  // If the transform_ is te identity matrix

[wjmaclean, 2016/04/13 14:47:19]

the

[alessandroa, 2016/04/21 15:39:21]

Done.

+  // then UV will be top_left (0,0) and
+  // lower_right (plugin_size_in_dip.width() / graphics_2d_size_in_dip.width(),
+  //             plugin_size_in_dip.height() / graphics_2d_size_in_dip.height())
+  gfx::PointF Translate = gfx::PointF(transform_.matrix().getFloat(0,3),

[wjmaclean, 2016/04/13 14:47:19]

Add a comment to warn the reader here that we're assuming the transform only
contains 2-D scale and 2-D translation.

Even better, add

DCHECK(transform.isScaleTranslate());

[alessandroa, 2016/04/21 15:39:21]

Nice one :)

+                                      transform_.matrix().getFloat(1,3));
+  float scale = transform_.matrix().getFloat(0,0);
+  gfx::PointF top_left = gfx::PointF(-1 *  Translate.x() / scale ,

[wjmaclean, 2016/04/13 14:47:18]

-Translate.x() ?

[alessandroa, 2016/04/21 15:39:21]

Done.

+                                     -1 * Translate.y() / scale);
+  gfx::PointF lower_right = gfx::PointF((1 / scale) * plugin_size_in_dip.width()
+                                        - 1 * Translate.x() / scale,

[wjmaclean, 2016/04/13 14:47:18]

Ditto. Also, even if you are using -1, you shouldn't write "- 1". Finally, use a
float literal, i.e. -1.f or -1.0f.

[alessandroa, 2016/04/21 15:39:21]

Acknowledged.

+                                       (1 / scale) * plugin_size_in_dip.height()
+                                       - 1 * Translate.y() / scale);
   texture_layer_->SetUV(
-      gfx::PointF(0.0f, 0.0f),
+      gfx::PointF(top_left.x() / graphics_2d_size_in_dip.width(),
+                  top_left.y() / graphics_2d_size_in_dip.height()),
       gfx::PointF(
-          plugin_size_in_dip.width() / graphics_2d_size_in_dip.width(),
-          plugin_size_in_dip.height() / graphics_2d_size_in_dip.height()));
+          lower_right.x() / graphics_2d_size_in_dip.width(),
+          lower_right.y() / graphics_2d_size_in_dip.height()));
 }
 
 bool PepperPluginInstanceImpl::PluginHasFocus() const {