Implement HiDPI support in Pepper dev interface

webkit/plugins/ppapi/ppb_graphics_2d_impl.cc

Index: webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
diff --git a/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc b/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
index 3a6a1a8c57d3e9ed682be98bde62388af62b34a4..c2ba9b959beff682f68be7f8f0c85945323624d4 100644
--- a/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
+++ b/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
@@ -159,6 +159,7 @@ PPB_Graphics2D_Impl::PPB_Graphics2D_Impl(PP_Instance instance)
       bound_instance_(NULL),
       offscreen_flush_pending_(false),
       is_always_opaque_(false),
+      scale_(1.0f),
       weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
@@ -171,17 +172,21 @@ PPB_Graphics2D_Impl::~PPB_Graphics2D_Impl() {
 // static
 PP_Resource PPB_Graphics2D_Impl::Create(PP_Instance instance,
                                         const PP_Size& size,
-                                        PP_Bool is_always_opaque) {
+                                        PP_Bool is_always_opaque,
+                                        float scale) {
   scoped_refptr<PPB_Graphics2D_Impl> graphics_2d(
       new PPB_Graphics2D_Impl(instance));
   if (!graphics_2d->Init(size.width, size.height,
-                         PPBoolToBool(is_always_opaque))) {
+                         PPBoolToBool(is_always_opaque), scale)) {
     return 0;
   }
   return graphics_2d->GetReference();
 }
 
-bool PPB_Graphics2D_Impl::Init(int width, int height, bool is_always_opaque) {
+bool PPB_Graphics2D_Impl::Init(int width,
+                               int height,
+                               bool is_always_opaque,
+                               float scale) {
   // The underlying PPB_ImageData_Impl will validate the dimensions.
   image_data_ = new PPB_ImageData_Impl(pp_instance());
   if (!image_data_->Init(PPB_ImageData_Impl::GetNativeImageDataFormat(),
@@ -191,6 +196,7 @@ bool PPB_Graphics2D_Impl::Init(int width, int height, bool is_always_opaque) {
     return false;
   }
   is_always_opaque_ = is_always_opaque;
+  scale_ = scale;
   return true;
 }
 
@@ -567,10 +573,15 @@ void PPB_Graphics2D_Impl::Paint(WebKit::WebCanvas* canvas,
     // more optimized painting.
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
   }
-  canvas->drawBitmap(image,
-                     SkIntToScalar(plugin_rect.x()),
-                     SkIntToScalar(plugin_rect.y()),
-                     &paint);
+
+  SkPoint origin;
+  origin.set(SkIntToScalar(plugin_rect.x()), SkIntToScalar(plugin_rect.y()));
+  if (scale_ != 1.0f && scale_ > 0.0f) {
+    float inverse_scale = 1.0f / scale_;
+    origin.scale(scale_);
+    canvas->scale(inverse_scale, inverse_scale);
+  }
+  canvas->drawBitmap(image, origin.x(), origin.y(), &paint);
   canvas->restore();
 #endif
 }