Adds View::OnWillCompositeTexture that is invoked before a texture is

drawn by the compositor and Compositor::Blur to blur a region. If you
want to blur a region, then you have to override
OnWillCompositeTexture and invoke Blur.
I considered adding an Effect enum that allows you to set BLUR on any
view. I shied away from that as we may need blur to take a region, and
I wasn't too happy about adding more to view. I can easily change it
though.

BUG=none
TEST=none
R=ben@chromium.org,wjmaclean@chromium.org

Review URL: http://codereview.chromium.org/7056046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@87989 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 18 insertions, 0 deletions

diff --git a/ui/gfx/compositor/compositor.h b/ui/gfx/compositor/compositor.h
index 9b35eb1..12b2e68 100644
--- a/ui/gfx/compositor/compositor.h
+++ b/ui/gfx/compositor/compositor.h
@@ -12,6 +12,7 @@
 class SkBitmap;
 namespace gfx {
 class Point;
+class Rect;
 class Size;
 }
 
@@ -21,6 +22,9 @@ class Transform;
 #if !defined(COMPOSITOR_2)
 typedef unsigned int TextureID;
 
+// NOTE: all coordinates passed to Texture/Compositor have 0x0 as the upper left
+// corner.
+
 // Compositor object to take care of GPU painting.
 // A Browser compositor object is responsible for generating the final
 // displayable form of pixels comprising a single widget's contents. It draws an
@@ -97,6 +101,9 @@ class Compositor : public base::RefCounted<Compositor> {
   // Notifies the compositor that compositing is complete.
   virtual void NotifyEnd() = 0;
 
+  // Blurs the specific region in the compositor.
+  virtual void Blur(const gfx::Rect& bounds) = 0;
+
  protected:
   virtual ~Compositor() {}
 
diff --git a/ui/gfx/compositor/compositor_gl.cc b/ui/gfx/compositor/compositor_gl.cc
index 7e6e297..794d836 100644
--- a/ui/gfx/compositor/compositor_gl.cc
+++ b/ui/gfx/compositor/compositor_gl.cc
@@ -66,6 +66,7 @@ class CompositorGL : public Compositor {
   virtual Texture* CreateTexture() OVERRIDE;
   virtual void NotifyStart() OVERRIDE;
   virtual void NotifyEnd() OVERRIDE;
+  virtual void Blur(const gfx::Rect& bounds) OVERRIDE;
 
   // Specific to CompositorGL.
   bool InitShaders();
@@ -272,6 +273,10 @@ void CompositorGL::NotifyEnd() {
   started_ = false;
 }
 
+void CompositorGL::Blur(const gfx::Rect& bounds) {
+  NOTIMPLEMENTED();
+}
+
 namespace {
 
 GLuint CompileShader(GLenum type, const GLchar* source) {
diff --git a/ui/gfx/compositor/compositor_win.cc b/ui/gfx/compositor/compositor_win.cc
index 67be3a6..a56f14b 100644
--- a/ui/gfx/compositor/compositor_win.cc
+++ b/ui/gfx/compositor/compositor_win.cc
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "base/logging.h"
 #include "base/stl_util-inl.h"
 #include "base/string_piece.h"
 #include "base/win/scoped_comptr.h"
@@ -272,6 +273,7 @@ class CompositorWin : public Compositor, public ViewTextureHost {
   virtual Texture* CreateTexture() OVERRIDE;
   virtual void NotifyStart() OVERRIDE;
   virtual void NotifyEnd() OVERRIDE;
+  virtual void Blur(const gfx::Rect& bounds) OVERRIDE;
 
  private:
   ~CompositorWin();
@@ -407,6 +409,10 @@ void CompositorWin::NotifyEnd() {
     technique_->GetPassByIndex(i)->Apply(0);
 }
 
+void CompositorWin::Blur(const gfx::Rect& bounds) {
+  NOTIMPLEMENTED();
+}
+
 CompositorWin::~CompositorWin() {
 }