Bug 864287 - Add back code to readback IOSurface plugins when using BasicLayers. r=BenWa

gfx/gl/GLContextProviderCGL.mm

@@ -464,6 +464,31 @@ GLContextProviderCGL::CreateSharedHandle(GLContext::SharedTextureShareType share
     return (SharedTextureHandle)surf;
 }
 
+already_AddRefed<gfxASurface>
+GLContextProviderCGL::GetSharedHandleAsSurface(GLContext::SharedTextureShareType shareType,
+                                               SharedTextureHandle sharedHandle)
+{
+  MacIOSurface* surf = reinterpret_cast<MacIOSurface*>(sharedHandle);
+  surf->Lock();
+  size_t bytesPerRow = surf->GetBytesPerRow();
+  size_t ioWidth = surf->GetWidth();
+  size_t ioHeight = surf->GetHeight();
+
+  unsigned char* ioData = (unsigned char*)surf->GetBaseAddress();
+
+  nsRefPtr<gfxImageSurface> imgSurface =
+    new gfxImageSurface(gfxIntSize(ioWidth, ioHeight), gfxASurface::ImageFormatARGB32);
+
+  for (size_t i = 0; i < ioHeight; i++) {
+    memcpy(imgSurface->Data() + i * imgSurface->Stride(),
+           ioData + i * bytesPerRow, ioWidth * 4);
+  }
+
+  surf->Unlock();
+
+  return imgSurface.forget();
+}
+
 void
 GLContextProviderCGL::Shutdown()
 {

gfx/gl/GLContextProviderEGL.cpp

@@ -2019,6 +2019,13 @@ GLContextProviderEGL::CreateSharedHandle(GLContext::SharedTextureShareType share
   return 0;
 }
 
+already_AddRefed<gfxASurface>
+GLContextProviderEGL::GetSharedHandleAsSurface(GLContext::SharedTextureShareType shareType,
+                                               SharedTextureHandle sharedHandle)
+{
+  return nullptr;
+}
+
 // Don't want a global context on Android as 1) share groups across 2 threads fail on many Tegra drivers (bug 759225)
 // and 2) some mobile devices have a very strict limit on global number of GL contexts (bug 754257)
 // and 3) each EGL context eats 750k on B2G (bug 813783)

gfx/gl/GLContextProviderGLX.cpp

@@ -1424,6 +1424,13 @@ GLContextProviderGLX::CreateSharedHandle(GLContext::SharedTextureShareType share
   return 0;
 }
 
+already_AddRefed<gfxASurface>
+GLContextProviderGLX::GetSharedHandleAsSurface(GLContext::SharedTextureShareType shareType,
+                                               SharedTextureHandle sharedHandle)
+{
+  return nullptr;
+}
+
 static nsRefPtr<GLContext> gGlobalContext[GLXLibrary::LIBS_MAX];
 // TODO move that out of static initializaion
 static bool gUseContextSharing = getenv("MOZ_DISABLE_CONTEXT_SHARING_GLX") == 0;

gfx/gl/GLContextProviderImpl.h

@@ -79,6 +79,9 @@ public:
                                                   void* buffer,
                                                   GLContext::SharedTextureBufferType bufferType);
 
+    static already_AddRefed<gfxASurface> GetSharedHandleAsSurface(GLContext::SharedTextureShareType shareType,
+                                                                  SharedTextureHandle sharedHandle);
+
     /**
      * Free any resources held by this Context Provider.
      */

gfx/gl/GLContextProviderNull.cpp

@@ -30,6 +30,13 @@ GLContextProviderNull::CreateSharedHandle(GLContext::SharedTextureShareType shar
   return 0;
 }
 
+already_AddRefed<gfxASurface>
+GLContextProviderNull::GetSharedHandleAsSurface(GLContext::SharedTextureShareType shareType,
+                                               SharedTextureHandle sharedHandle)
+{
+  return nullptr;
+}
+
 GLContext*
 GLContextProviderNull::GetGlobalContext(ContextFlags)
 {

gfx/gl/GLContextProviderWGL.cpp

@@ -695,6 +695,13 @@ GLContextProviderWGL::CreateSharedHandle(GLContext::SharedTextureShareType share
   return 0;
 }
 
+already_AddRefed<gfxASurface>
+GLContextProviderWGL::GetSharedHandleAsSurface(GLContext::SharedTextureShareType shareType,
+                                               SharedTextureHandle sharedHandle)
+{
+  return nullptr;
+}
+
 static nsRefPtr<GLContextWGL> gGlobalContext[WGLLibrary::LIBS_MAX];
 
 GLContext *

gfx/layers/SharedTextureImage.h

@@ -8,6 +8,7 @@
 
 #include "ImageContainer.h"
 #include "GLContext.h"
+#include "GLContextProvider.h"
 
 // Split into a separate header from ImageLayers.h due to GLContext.h dependence
 // Implementation remains in ImageLayers.cpp
@@ -30,7 +31,9 @@ public:
 
   gfxIntSize GetSize() { return mData.mSize; }
 
-  virtual already_AddRefed<gfxASurface> GetAsSurface() { return NULL; }
+  virtual already_AddRefed<gfxASurface> GetAsSurface() { 
+    return gl::GLContextProvider::GetSharedHandleAsSurface(mData.mShareType, mData.mHandle);
+  }
 
   SharedTextureImage() : Image(NULL, SHARED_TEXTURE) {}