Fix UpdateTilePriorities viewport in Android WebView.

cc/output/direct_renderer.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/direct_renderer.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 242 matching lines @@
     // Only intersect inverse-projected damage if the transform is invertible.
     gfx::RectF damage_rect_in_render_pass_space =
         MathUtil::ProjectClippedRect(inverse_transform,
                                      frame->root_damage_rect);
     render_pass_scissor.Intersect(damage_rect_in_render_pass_space);
   }
 
   return render_pass_scissor;
 }
 
+bool DirectRenderer::NeedDeviceClip(const DrawingFrame* frame) const {
+  if (frame->current_render_pass != frame->root_render_pass)
+    return false;
+
+  return !client_->DeviceClip().Contains(client_->DeviceViewport());
+}
+
+gfx::Rect DirectRenderer::DeviceClipRect(const DrawingFrame* frame) const {
+  gfx::Rect device_clip_rect = client_->DeviceClip();
+  if (FlippedFramebuffer())
+    device_clip_rect.set_y(current_surface_size_.height() -
+                           device_clip_rect.bottom());
+  return device_clip_rect;
+}
+
 void DirectRenderer::SetScissorStateForQuad(const DrawingFrame* frame,
                                             const DrawQuad& quad) {
   if (quad.isClipped()) {
-    gfx::RectF quad_scissor_rect = quad.clipRect();
-    SetScissorTestRect(MoveFromDrawToWindowSpace(quad_scissor_rect));
-  } else {
-    EnsureScissorTestDisabled();
+    SetScissorTestRectInDrawSpace(frame, quad.clipRect());
+    return;
   }
+  if (NeedDeviceClip(frame)) {
+    SetScissorTestRect(DeviceClipRect(frame));
+    return;
+  }
+
+  EnsureScissorTestDisabled();
 }
 
 void DirectRenderer::SetScissorStateForQuadWithRenderPassScissor(
     const DrawingFrame* frame,
     const DrawQuad& quad,
     const gfx::RectF& render_pass_scissor,
     bool* should_skip_quad) {
   gfx::RectF quad_scissor_rect = render_pass_scissor;
 
   if (quad.isClipped())
     quad_scissor_rect.Intersect(quad.clipRect());
 
   if (quad_scissor_rect.IsEmpty()) {
     *should_skip_quad = true;
     return;
   }
 
   *should_skip_quad = false;
-  SetScissorTestRect(MoveFromDrawToWindowSpace(quad_scissor_rect));
+  SetScissorTestRectInDrawSpace(frame, quad_scissor_rect);
+}
+
+void DirectRenderer::SetScissorTestRectInDrawSpace(const DrawingFrame* frame,
+                                                   gfx::RectF draw_space_rect) {
+  gfx::Rect window_space_rect = MoveFromDrawToWindowSpace(draw_space_rect);
+  if (NeedDeviceClip(frame))
+    window_space_rect.Intersect(DeviceClipRect(frame));
+  SetScissorTestRect(window_space_rect);
 }
 
 void DirectRenderer::FinishDrawingQuadList() {}
 
 void DirectRenderer::DrawRenderPass(DrawingFrame* frame,
                                     const RenderPass* render_pass) {
   TRACE_EVENT0("cc", "DirectRenderer::DrawRenderPass");
   if (!UseRenderPass(frame, render_pass))
     return;
 
   bool using_scissor_as_optimization =
       Capabilities().using_partial_swap && client_->AllowPartialSwap();
   gfx::RectF render_pass_scissor;
 
   if (using_scissor_as_optimization) {
     render_pass_scissor = ComputeScissorRectForRenderPass(frame);
-    SetScissorTestRect(MoveFromDrawToWindowSpace(render_pass_scissor));
+    SetScissorTestRectInDrawSpace(frame, render_pass_scissor);
   }
 
   if (frame->current_render_pass != frame->root_render_pass ||
       client_->ShouldClearRootRenderPass()) {
-    if (!using_scissor_as_optimization)
+    if (NeedDeviceClip(frame))
+      SetScissorTestRect(DeviceClipRect(frame));
+    else if (!using_scissor_as_optimization)
       EnsureScissorTestDisabled();
     ClearFramebuffer(frame);
   }
 
   const QuadList& quad_list = render_pass->quad_list;
   for (QuadList::ConstBackToFrontIterator it = quad_list.BackToFrontBegin();
        it != quad_list.BackToFrontEnd();
        ++it) {
     const DrawQuad& quad = *(*it);
     bool should_skip_quad = false;
@@ skipping 62 matching lines @@
 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
   return render_pass->output_rect.size();
 }
 
 // static
 GLenum DirectRenderer::RenderPassTextureFormat(const RenderPass* render_pass) {
   return GL_RGBA;
 }
 
 }  // namespace cc