Splitting of layers for correct intersections

cc/output/gl_renderer.cc

 // Copyright 2010 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/gl_renderer.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "build/build_config.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/layers/video_layer_impl.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/copy_output_request.h"
-#include "cc/output/geometry_binding.h"
+#include "cc/output/dynamic_geometry_binding.h"
 #include "cc/output/gl_frame_data.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/render_surface_filters.h"
+#include "cc/output/static_geometry_binding.h"
+#include "cc/quads/draw_polygon.h"
 #include "cc/quads/picture_draw_quad.h"
 #include "cc/quads/render_pass.h"
 #include "cc/quads/stream_video_draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/resources/layer_quad.h"
 #include "cc/resources/scoped_gpu_raster.h"
 #include "cc/resources/scoped_resource.h"
 #include "cc/resources/texture_mailbox_deleter.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/context_support.h"
@@ skipping 282 matching lines @@
       context_support_(output_surface->context_provider()->ContextSupport()),
       texture_mailbox_deleter_(texture_mailbox_deleter),
       is_backbuffer_discarded_(false),
       is_scissor_enabled_(false),
       scissor_rect_needs_reset_(true),
       stencil_shadow_(false),
       blend_shadow_(false),
       highp_threshold_min_(highp_threshold_min),
       highp_threshold_cache_(0),
       use_sync_query_(false),
-      on_demand_tile_raster_resource_id_(0) {
+      on_demand_tile_raster_resource_id_(0),
+      bound_geometry_(NO_BINDING) {
   DCHECK(gl_);
   DCHECK(context_support_);
 
   ContextProvider::Capabilities context_caps =
       output_surface_->context_provider()->ContextCapabilities();
 
   capabilities_.using_partial_swap =
       settings_->partial_swap_enabled && context_caps.gpu.post_sub_buffer;
 
   DCHECK(!context_caps.gpu.iosurface || context_caps.gpu.texture_rectangle);
@@ skipping 149 matching lines @@
 
   // TODO(enne): Do we need to reinitialize all of this state per frame?
   ReinitializeGLState();
 }
 
 void GLRenderer::DoNoOp() {
   GLC(gl_, gl_->BindFramebuffer(GL_FRAMEBUFFER, 0));
   GLC(gl_, gl_->Flush());
 }
 
-void GLRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
+void GLRenderer::DoDrawQuad(DrawingFrame* frame,
+                            const DrawQuad* quad,
+                            const gfx::QuadF* clip_region) {
   DCHECK(quad->rect.Contains(quad->visible_rect));
   if (quad->material != DrawQuad::TEXTURE_CONTENT) {
-    FlushTextureQuadCache();
+    FlushTextureQuadCache(SHARED_BINDING);
   }
 
   switch (quad->material) {
     case DrawQuad::INVALID:
       NOTREACHED();
       break;
     case DrawQuad::CHECKERBOARD:
-      DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad));
+      DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad),
+                           clip_region);
       break;
     case DrawQuad::DEBUG_BORDER:
       DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
       break;
     case DrawQuad::IO_SURFACE_CONTENT:
-      DrawIOSurfaceQuad(frame, IOSurfaceDrawQuad::MaterialCast(quad));
+      DrawIOSurfaceQuad(frame, IOSurfaceDrawQuad::MaterialCast(quad),
+                        clip_region);
       break;
     case DrawQuad::PICTURE_CONTENT:
       // PictureDrawQuad should only be used for resourceless software draws.
       NOTREACHED();
       break;
     case DrawQuad::RENDER_PASS:
-      DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad));
+      DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad),
+                         clip_region);
       break;
     case DrawQuad::SOLID_COLOR:
-      DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad));
+      DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad),
+                         clip_region);
       break;
     case DrawQuad::STREAM_VIDEO_CONTENT:
-      DrawStreamVideoQuad(frame, StreamVideoDrawQuad::MaterialCast(quad));
+      DrawStreamVideoQuad(frame, StreamVideoDrawQuad::MaterialCast(quad),
+                          clip_region);
       break;
     case DrawQuad::SURFACE_CONTENT:
       // Surface content should be fully resolved to other quad types before
       // reaching a direct renderer.
       NOTREACHED();
       break;
     case DrawQuad::TEXTURE_CONTENT:
-      EnqueueTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
+      EnqueueTextureQuad(frame, TextureDrawQuad::MaterialCast(quad),
+                         clip_region);
       break;
     case DrawQuad::TILED_CONTENT:
-      DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad));
+      DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad), clip_region);
       break;
     case DrawQuad::YUV_VIDEO_CONTENT:
-      DrawYUVVideoQuad(frame, YUVVideoDrawQuad::MaterialCast(quad));
+      DrawYUVVideoQuad(frame, YUVVideoDrawQuad::MaterialCast(quad),
+                       clip_region);
       break;
   }
 }
 
 void GLRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
-                                      const CheckerboardDrawQuad* quad) {
+                                      const CheckerboardDrawQuad* quad,
+                                      const gfx::QuadF* clip_region) {
+  // TODO(enne) For now since checkerboards shouldn't be part of a 3D
+  // context, clipping regions aren't supported so we skip drawing them
+  // if this becomes the case.
+  if (clip_region) {
+    return;
+  }
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   const TileCheckerboardProgram* program = GetTileCheckerboardProgram();
   DCHECK(program && (program->initialized() || IsContextLost()));
   SetUseProgram(program->program());
 
   SkColor color = quad->color;
   GLC(gl_,
       gl_->Uniform4f(program->fragment_shader().color_location(),
                      SkColorGetR(color) * (1.0f / 255.0f),
@@ skipping 21 matching lines @@
                      frequency));
 
   SetShaderOpacity(quad->opacity(),
                    program->fragment_shader().alpha_location());
   DrawQuadGeometry(frame,
                    quad->quadTransform(),
                    quad->rect,
                    program->vertex_shader().matrix_location());
 }
 
+// This function does not handle 3D sorting right now, since the debug border
+// quads are just drawn as their original quads and not in split pieces. This
+// results in some debug border quads drawing over foreground quads.
 void GLRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
                                      const DebugBorderDrawQuad* quad) {
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   static float gl_matrix[16];
   const DebugBorderProgram* program = GetDebugBorderProgram();
   DCHECK(program && (program->initialized() || IsContextLost()));
   SetUseProgram(program->program());
 
   // Use the full quad_rect for debug quads to not move the edges based on
@@ skipping 211 matching lines @@
   if (frame->current_render_pass->has_transparent_background)
     return false;
 
   // TODO(ajuma): Add support for reference filters once
   // FilterOperations::GetOutsets supports reference filters.
   if (quad->background_filters.HasReferenceFilter())
     return false;
   return true;
 }
 
+// This takes a gfx::Rect and a clip region quad in the same space,
+// and returns a quad with the same proportions in the space -0.5->0.5.
+bool GetScaledRegion(const gfx::Rect& rect,
+                     const gfx::QuadF* clip,
+                     gfx::QuadF* scaled_region) {
+  if (!clip)
+    return false;
+
+  gfx::PointF p1(((clip->p1().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p1().y() - rect.y()) / rect.height()) - 0.5f);
+  gfx::PointF p2(((clip->p2().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p2().y() - rect.y()) / rect.height()) - 0.5f);
+  gfx::PointF p3(((clip->p3().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p3().y() - rect.y()) / rect.height()) - 0.5f);
+  gfx::PointF p4(((clip->p4().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p4().y() - rect.y()) / rect.height()) - 0.5f);
+  *scaled_region = gfx::QuadF(p1, p2, p3, p4);
+  return true;
+}
+
+// This takes a gfx::Rect and a clip region quad in the same space,
+// and returns the proportional uv's in the space 0->1.
+bool GetScaledUVs(const gfx::Rect& rect, const gfx::QuadF* clip, float uvs[8]) {
+  if (!clip)
+    return false;
+
+  uvs[0] = ((clip->p1().x() - rect.x()) / rect.width());
+  uvs[1] = ((clip->p1().y() - rect.y()) / rect.height());
+  uvs[2] = ((clip->p2().x() - rect.x()) / rect.width());
+  uvs[3] = ((clip->p2().y() - rect.y()) / rect.height());
+  uvs[4] = ((clip->p3().x() - rect.x()) / rect.width());
+  uvs[5] = ((clip->p3().y() - rect.y()) / rect.height());
+  uvs[6] = ((clip->p4().x() - rect.x()) / rect.width());
+  uvs[7] = ((clip->p4().y() - rect.y()) / rect.height());
+  return true;
+}
+
 gfx::Rect GLRenderer::GetBackdropBoundingBoxForRenderPassQuad(
     DrawingFrame* frame,
     const RenderPassDrawQuad* quad,
     const gfx::Transform& contents_device_transform,
+    const gfx::QuadF* clip_region,
     bool use_aa) {
+  gfx::QuadF scaled_region;
+  if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
+    scaled_region = SharedGeometryQuad().BoundingBox();
+  }
+
   gfx::Rect backdrop_rect = gfx::ToEnclosingRect(MathUtil::MapClippedRect(
-      contents_device_transform, SharedGeometryQuad().BoundingBox()));
+      contents_device_transform, scaled_region.BoundingBox()));
 
   if (ShouldApplyBackgroundFilters(frame, quad)) {
     int top, right, bottom, left;
     quad->background_filters.GetOutsets(&top, &right, &bottom, &left);
     backdrop_rect.Inset(-left, -top, -right, -bottom);
   }
 
   if (!backdrop_rect.IsEmpty() && use_aa) {
     const int kOutsetForAntialiasing = 1;
     backdrop_rect.Inset(-kOutsetForAntialiasing, -kOutsetForAntialiasing);
@@ skipping 28 matching lines @@
   skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
       quad->background_filters, background_texture->size());
 
   skia::RefPtr<SkImage> background_with_filters = ApplyImageFilter(
       ScopedUseGrContext::Create(this, frame), resource_provider_, quad->rect,
       quad->filters_scale, filter.get(), background_texture);
   return background_with_filters;
 }
 
 void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
-                                    const RenderPassDrawQuad* quad) {
+                                    const RenderPassDrawQuad* quad,
+                                    const gfx::QuadF* clip_region) {
   ScopedResource* contents_texture =
       render_pass_textures_.get(quad->render_pass_id);
   if (!contents_texture || !contents_texture->id())
     return;
 
   gfx::Transform quad_rect_matrix;
   QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
   gfx::Transform contents_device_transform =
       frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
   contents_device_transform.FlattenTo2d();
 
   // Can only draw surface if device matrix is invertible.
   if (!contents_device_transform.IsInvertible())
     return;
 
   gfx::QuadF surface_quad = SharedGeometryQuad();
   float edge[24];
   bool use_aa = settings_->allow_antialiasing &&
                 ShouldAntialiasQuad(contents_device_transform, quad,
                                     settings_->force_antialiasing);
 
-  if (use_aa)
-    SetupQuadForAntialiasing(contents_device_transform, quad,
-                             &surface_quad, edge);
-
+  SetupQuadForClippingAndAntialiasing(contents_device_transform, quad, use_aa,
+                                      clip_region, &surface_quad, edge);
   SkXfermode::Mode blend_mode = quad->shared_quad_state->blend_mode;
   bool use_shaders_for_blending =
       !CanApplyBlendModeUsingBlendFunc(blend_mode) ||
       ShouldApplyBackgroundFilters(frame, quad) ||
       settings_->force_blending_with_shaders;
 
   scoped_ptr<ScopedResource> background_texture;
   skia::RefPtr<SkImage> background_image;
   gfx::Rect background_rect;
   if (use_shaders_for_blending) {
     // Compute a bounding box around the pixels that will be visible through
     // the quad.
     background_rect = GetBackdropBoundingBoxForRenderPassQuad(
-        frame, quad, contents_device_transform, use_aa);
+        frame, quad, contents_device_transform, clip_region, use_aa);
 
     if (!background_rect.IsEmpty()) {
       // The pixels from the filtered background should completely replace the
       // current pixel values.
       if (blend_enabled())
         SetBlendEnabled(false);
 
       // Read the pixels in the bounding box into a buffer R.
       // This function allocates a texture, which should contribute to the
       // amount of memory used by render surfaces:
@@ skipping 402 matching lines @@
 static void SolidColorUniformLocation(T program,
                                       SolidColorProgramUniforms* uniforms) {
   uniforms->program = program->program();
   uniforms->matrix_location = program->vertex_shader().matrix_location();
   uniforms->viewport_location = program->vertex_shader().viewport_location();
   uniforms->quad_location = program->vertex_shader().quad_location();
   uniforms->edge_location = program->vertex_shader().edge_location();
   uniforms->color_location = program->fragment_shader().color_location();
 }
 
+namespace {
+// These functions determine if a quad, clipped by a clip_region contains
+// the entire {top|bottom|left|right} edge.
+bool is_top(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsTopEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p1().y()) < kAntiAliasingEpsilon &&
+         std::abs(clip_region->p2().y()) < kAntiAliasingEpsilon;
+}
+
+bool is_bottom(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsBottomEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p3().y() -
+                  quad->shared_quad_state->content_bounds.height()) <
+             kAntiAliasingEpsilon &&
+         std::abs(clip_region->p4().y() -
+                  quad->shared_quad_state->content_bounds.height()) <
+             kAntiAliasingEpsilon;
+}
+
+bool is_left(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsLeftEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p1().x()) < kAntiAliasingEpsilon &&
+         std::abs(clip_region->p4().x()) < kAntiAliasingEpsilon;
+}
+
+bool is_right(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsRightEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p2().x() -
+                  quad->shared_quad_state->content_bounds.width()) <
+             kAntiAliasingEpsilon &&
+         std::abs(clip_region->p3().x() -
+                  quad->shared_quad_state->content_bounds.width()) <
+             kAntiAliasingEpsilon;
+}
+}  // anonymous namespace
+
 static gfx::QuadF GetDeviceQuadWithAntialiasingOnExteriorEdges(
     const LayerQuad& device_layer_edges,
     const gfx::Transform& device_transform,
+    const gfx::QuadF* clip_region,
     const DrawQuad* quad) {
-  gfx::Rect tile_rect = quad->visible_rect;
-  gfx::PointF bottom_right = tile_rect.bottom_right();
-  gfx::PointF bottom_left = tile_rect.bottom_left();
-  gfx::PointF top_left = tile_rect.origin();
-  gfx::PointF top_right = tile_rect.top_right();
+  gfx::RectF tile_rect = quad->visible_rect;
+  gfx::QuadF tile_quad(tile_rect);
+
+  if (clip_region) {
+    if (quad->material != DrawQuad::RENDER_PASS) {
+      tile_quad = *clip_region;
+    } else {
+      GetScaledRegion(quad->rect, clip_region, &tile_quad);
+    }
+  }
+
+  gfx::PointF bottom_right = tile_quad.p3();
+  gfx::PointF bottom_left = tile_quad.p4();
+  gfx::PointF top_left = tile_quad.p1();
+  gfx::PointF top_right = tile_quad.p2();
   bool clipped = false;
 
   // Map points to device space. We ignore |clipped|, since the result of
   // |MapPoint()| still produces a valid point to draw the quad with. When
   // clipped, the point will be outside of the viewport. See crbug.com/416367.
   bottom_right = MathUtil::MapPoint(device_transform, bottom_right, &clipped);
   bottom_left = MathUtil::MapPoint(device_transform, bottom_left, &clipped);
   top_left = MathUtil::MapPoint(device_transform, top_left, &clipped);
   top_right = MathUtil::MapPoint(device_transform, top_right, &clipped);
 
   LayerQuad::Edge bottom_edge(bottom_right, bottom_left);
   LayerQuad::Edge left_edge(bottom_left, top_left);
   LayerQuad::Edge top_edge(top_left, top_right);
   LayerQuad::Edge right_edge(top_right, bottom_right);
 
   // Only apply anti-aliasing to edges not clipped by culling or scissoring.
-  if (quad->IsTopEdge() && tile_rect.y() == quad->rect.y())
+  // If an edge is degenerate we do not want to replace it with a "proper" edge
+  // as that will cause the quad to possibly expand is strange ways.
+  if (!top_edge.degenerate() && is_top(clip_region, quad) &&
+      tile_rect.y() == quad->rect.y()) {
     top_edge = device_layer_edges.top();
-  if (quad->IsLeftEdge() && tile_rect.x() == quad->rect.x())
+  }
+  if (!left_edge.degenerate() && is_left(clip_region, quad) &&
+      tile_rect.x() == quad->rect.x()) {
     left_edge = device_layer_edges.left();
-  if (quad->IsRightEdge() && tile_rect.right() == quad->rect.right())
+  }
+  if (!right_edge.degenerate() && is_right(clip_region, quad) &&
+      tile_rect.right() == quad->rect.right()) {
     right_edge = device_layer_edges.right();
-  if (quad->IsBottomEdge() && tile_rect.bottom() == quad->rect.bottom())
+  }
+  if (!bottom_edge.degenerate() && is_bottom(clip_region, quad) &&
+      tile_rect.bottom() == quad->rect.bottom()) {
     bottom_edge = device_layer_edges.bottom();
+  }
 
-  float sign = gfx::QuadF(tile_rect).IsCounterClockwise() ? -1 : 1;
+  float sign = tile_quad.IsCounterClockwise() ? -1 : 1;
   bottom_edge.scale(sign);
   left_edge.scale(sign);
   top_edge.scale(sign);
   right_edge.scale(sign);
 
   // Create device space quad.
   return LayerQuad(left_edge, top_edge, right_edge, bottom_edge).ToQuadF();
 }
 
+float GetTotalQuadError(const gfx::QuadF* clipped_quad,
+                        const gfx::QuadF* ideal_rect) {
+  return (clipped_quad->p1() - ideal_rect->p1()).LengthSquared() +
+         (clipped_quad->p2() - ideal_rect->p2()).LengthSquared() +
+         (clipped_quad->p3() - ideal_rect->p3()).LengthSquared() +
+         (clipped_quad->p4() - ideal_rect->p4()).LengthSquared();
+}
+
+// Attempt to rotate the clipped quad until it lines up the most
+// correctly. This is necessary because we check the edges of this
+// quad against the expected left/right/top/bottom for anti-aliasing.
+void AlignQuadToBoundingBox(gfx::QuadF* clipped_quad) {
+  gfx::QuadF bounding_quad = gfx::QuadF(clipped_quad->BoundingBox());
+  gfx::QuadF best_rotation = *clipped_quad;
+  float least_error_amount = GetTotalQuadError(clipped_quad, &bounding_quad);
+  for (size_t i = 1; i < 4; ++i) {
+    clipped_quad->Realign(1);
+    float new_error = GetTotalQuadError(clipped_quad, &bounding_quad);
+    if (new_error < least_error_amount) {
+      least_error_amount = new_error;
+      best_rotation = *clipped_quad;
+    }
+  }
+  *clipped_quad = best_rotation;
+}
+
 // static
 bool GLRenderer::ShouldAntialiasQuad(const gfx::Transform& device_transform,
                                      const DrawQuad* quad,
                                      bool force_antialiasing) {
   bool is_render_pass_quad = (quad->material == DrawQuad::RENDER_PASS);
   // For render pass quads, |device_transform| already contains quad's rect.
   // TODO(rosca@adobe.com): remove branching on is_render_pass_quad
   // crbug.com/429702
   if (!is_render_pass_quad && !quad->IsEdge())
     return false;
@@ skipping 11 matching lines @@
   bool is_nearest_rect_within_epsilon =
       is_axis_aligned_in_target &&
       gfx::IsNearestRectWithinDistance(device_layer_quad.BoundingBox(),
                                        kAntiAliasingEpsilon);
   // AAing clipped quads is not supported by the code yet.
   bool use_aa = !clipped && !is_nearest_rect_within_epsilon;
   return use_aa || force_antialiasing;
 }
 
 // static
-void GLRenderer::SetupQuadForAntialiasing(
+void GLRenderer::SetupQuadForClippingAndAntialiasing(
     const gfx::Transform& device_transform,
     const DrawQuad* quad,
+    bool use_aa,
+    const gfx::QuadF* clip_region,
     gfx::QuadF* local_quad,
     float edge[24]) {
   bool is_render_pass_quad = (quad->material == DrawQuad::RENDER_PASS);
-  gfx::RectF content_rect =
-      is_render_pass_quad ? QuadVertexRect() : quad->visibleContentRect();
+  gfx::QuadF rotated_clip;
+  const gfx::QuadF* local_clip_region = clip_region;
+  if (local_clip_region) {
+    rotated_clip = *clip_region;
+    AlignQuadToBoundingBox(&rotated_clip);
+    local_clip_region = &rotated_clip;
+  }
 
+  gfx::QuadF content_rect = is_render_pass_quad
+                                ? gfx::QuadF(QuadVertexRect())
+                                : gfx::QuadF(quad->visibleContentRect());
+  if (!use_aa) {
+    if (local_clip_region) {
+      if (!is_render_pass_quad) {
+        content_rect = *local_clip_region;
+      } else {
+        GetScaledRegion(quad->rect, local_clip_region, &content_rect);
+      }
+      *local_quad = content_rect;
+    }
+    return;
+  }
   bool clipped = false;
   gfx::QuadF device_layer_quad =
-      MathUtil::MapQuad(device_transform, gfx::QuadF(content_rect), &clipped);
+      MathUtil::MapQuad(device_transform, content_rect, &clipped);
 
   LayerQuad device_layer_bounds(gfx::QuadF(device_layer_quad.BoundingBox()));
   device_layer_bounds.InflateAntiAliasingDistance();
 
   LayerQuad device_layer_edges(device_layer_quad);
   device_layer_edges.InflateAntiAliasingDistance();
 
   device_layer_edges.ToFloatArray(edge);
   device_layer_bounds.ToFloatArray(&edge[12]);
 
+  // If we have a clip region then we are split, and therefore
+  // by necessity, at least one of our edges is not an external
+  // one.
+  bool is_full_rect = quad->visible_rect == quad->rect;
+
+  bool region_contains_all_outside_edges =
+      is_full_rect &&
+      (is_top(local_clip_region, quad) && is_left(local_clip_region, quad) &&
+       is_bottom(local_clip_region, quad) && is_right(local_clip_region, quad));
+
   bool use_aa_on_all_four_edges =
-      is_render_pass_quad ||
-      (quad->IsTopEdge() && quad->IsLeftEdge() && quad->IsBottomEdge() &&
-       quad->IsRightEdge() && quad->visible_rect == quad->rect);
+      !local_clip_region &&
+      (is_render_pass_quad || region_contains_all_outside_edges);
 
   gfx::QuadF device_quad =
       use_aa_on_all_four_edges
           ? device_layer_edges.ToQuadF()
           : GetDeviceQuadWithAntialiasingOnExteriorEdges(
-                device_layer_edges, device_transform, quad);
+                device_layer_edges, device_transform, local_clip_region, quad);
 
   // Map device space quad to local space. device_transform has no 3d
   // component since it was flattened, so we don't need to project.  We should
   // have already checked that the transform was uninvertible above.
   gfx::Transform inverse_device_transform(gfx::Transform::kSkipInitialization);
   bool did_invert = device_transform.GetInverse(&inverse_device_transform);
   DCHECK(did_invert);
   *local_quad =
       MathUtil::MapQuad(inverse_device_transform, device_quad, &clipped);
   // We should not DCHECK(!clipped) here, because anti-aliasing inflation may
   // cause device_quad to become clipped. To our knowledge this scenario does
   // not need to be handled differently than the unclipped case.
 }
 
 void GLRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
-                                    const SolidColorDrawQuad* quad) {
+                                    const SolidColorDrawQuad* quad,
+                                    const gfx::QuadF* clip_region) {
   gfx::Rect tile_rect = quad->visible_rect;
 
   SkColor color = quad->color;
   float opacity = quad->opacity();
   float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
 
   // Early out if alpha is small enough that quad doesn't contribute to output.
   if (alpha < std::numeric_limits<float>::epsilon() &&
       quad->ShouldDrawWithBlending())
     return;
 
   gfx::Transform device_transform =
       frame->window_matrix * frame->projection_matrix * quad->quadTransform();
   device_transform.FlattenTo2d();
   if (!device_transform.IsInvertible())
     return;
 
   bool force_aa = false;
   gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
   float edge[24];
   bool use_aa = settings_->allow_antialiasing &&
                 !quad->force_anti_aliasing_off &&
                 ShouldAntialiasQuad(device_transform, quad, force_aa);
+  SetupQuadForClippingAndAntialiasing(device_transform, quad, use_aa,
+                                      clip_region, &local_quad, edge);
 
   SolidColorProgramUniforms uniforms;
   if (use_aa) {
-    SetupQuadForAntialiasing(device_transform, quad, &local_quad, edge);
     SolidColorUniformLocation(GetSolidColorProgramAA(), &uniforms);
   } else {
     SolidColorUniformLocation(GetSolidColorProgram(), &uniforms);
   }
   SetUseProgram(uniforms.program);
 
   GLC(gl_,
       gl_->Uniform4f(uniforms.color_location,
                      (SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
                      (SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
@@ skipping 50 matching lines @@
   uniforms->vertex_tex_transform_location =
       program->vertex_shader().vertex_tex_transform_location();
 
   uniforms->sampler_location = program->fragment_shader().sampler_location();
   uniforms->alpha_location = program->fragment_shader().alpha_location();
   uniforms->fragment_tex_transform_location =
       program->fragment_shader().fragment_tex_transform_location();
 }
 
 void GLRenderer::DrawTileQuad(const DrawingFrame* frame,
-                              const TileDrawQuad* quad) {
-  DrawContentQuad(frame, quad, quad->resource_id);
+                              const TileDrawQuad* quad,
+                              const gfx::QuadF* clip_region) {
+  DrawContentQuad(frame, quad, quad->resource_id, clip_region);
 }
 
 void GLRenderer::DrawContentQuad(const DrawingFrame* frame,
                                  const ContentDrawQuadBase* quad,
-                                 ResourceProvider::ResourceId resource_id) {
+                                 ResourceProvider::ResourceId resource_id,
+                                 const gfx::QuadF* clip_region) {
   gfx::Transform device_transform =
       frame->window_matrix * frame->projection_matrix * quad->quadTransform();
   device_transform.FlattenTo2d();
 
   bool use_aa = settings_->allow_antialiasing &&
                 ShouldAntialiasQuad(device_transform, quad, false);
 
   // TODO(timav): simplify coordinate transformations in DrawContentQuadAA
   // similar to the way DrawContentQuadNoAA works and then consider
   // combining DrawContentQuadAA and DrawContentQuadNoAA into one method.
   if (use_aa)
-    DrawContentQuadAA(frame, quad, resource_id, device_transform);
+    DrawContentQuadAA(frame, quad, resource_id, device_transform, clip_region);
   else
-    DrawContentQuadNoAA(frame, quad, resource_id);
+    DrawContentQuadNoAA(frame, quad, resource_id, clip_region);
 }
 
 void GLRenderer::DrawContentQuadAA(const DrawingFrame* frame,
                                    const ContentDrawQuadBase* quad,
                                    ResourceProvider::ResourceId resource_id,
-                                   const gfx::Transform& device_transform) {
+                                   const gfx::Transform& device_transform,
+                                   const gfx::QuadF* clip_region) {
   if (!device_transform.IsInvertible())
     return;
 
   gfx::Rect tile_rect = quad->visible_rect;
 
   gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
       quad->tex_coord_rect, quad->rect, tile_rect);
   float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
   float tex_to_geom_scale_y =
       quad->rect.height() / quad->tex_coord_rect.height();
@@ skipping 24 matching lines @@
   float vertex_tex_translate_y =
       -clamp_geom_rect.y() / clamp_geom_rect.height();
   float vertex_tex_scale_x = tile_rect.width() / clamp_geom_rect.width();
   float vertex_tex_scale_y = tile_rect.height() / clamp_geom_rect.height();
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
       gl_, &highp_threshold_cache_, highp_threshold_min_, quad->texture_size);
 
   gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
   float edge[24];
-  SetupQuadForAntialiasing(device_transform, quad, &local_quad, edge);
-
+  SetupQuadForClippingAndAntialiasing(device_transform, quad, true, clip_region,
+                                      &local_quad, edge);
   ResourceProvider::ScopedSamplerGL quad_resource_lock(
       resource_provider_, resource_id,
       quad->nearest_neighbor ? GL_NEAREST : GL_LINEAR);
   SamplerType sampler =
       SamplerTypeFromTextureTarget(quad_resource_lock.target());
 
   float fragment_tex_translate_x = clamp_tex_rect.x();
   float fragment_tex_translate_y = clamp_tex_rect.y();
   float fragment_tex_scale_x = clamp_tex_rect.width();
   float fragment_tex_scale_y = clamp_tex_rect.height();
@@ skipping 57 matching lines @@
   // it. This is why this centered rect is used and not the original quad_rect.
   gfx::RectF centered_rect(
       gfx::PointF(-0.5f * tile_rect.width(), -0.5f * tile_rect.height()),
       tile_rect.size());
   DrawQuadGeometry(
       frame, quad->quadTransform(), centered_rect, uniforms.matrix_location);
 }
 
 void GLRenderer::DrawContentQuadNoAA(const DrawingFrame* frame,
                                      const ContentDrawQuadBase* quad,
-                                     ResourceProvider::ResourceId resource_id) {
+                                     ResourceProvider::ResourceId resource_id,
+                                     const gfx::QuadF* clip_region) {
   gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
       quad->tex_coord_rect, quad->rect, quad->visible_rect);
   float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
   float tex_to_geom_scale_y =
       quad->rect.height() / quad->tex_coord_rect.height();
 
   bool scaled = (tex_to_geom_scale_x != 1.f || tex_to_geom_scale_y != 1.f);
   GLenum filter =
       (scaled || !quad->quadTransform().IsIdentityOrIntegerTranslation()) &&
               !quad->nearest_neighbor
@@ skipping 53 matching lines @@
                      vertex_tex_scale_y));
 
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   SetShaderOpacity(quad->opacity(), uniforms.alpha_location);
 
   // Pass quad coordinates to the uniform in the same order as GeometryBinding
   // does, then vertices will match the texture mapping in the vertex buffer.
   // The method SetShaderQuadF() changes the order of vertices and so it's
   // not used here.
-
-  gfx::RectF tile_rect = quad->visible_rect;
+  gfx::QuadF tile_rect(quad->visible_rect);
+  float width = quad->visible_rect.width();
+  float height = quad->visible_rect.height();
+  gfx::PointF top_left = quad->visible_rect.origin();
+  if (clip_region) {
+    tile_rect = *clip_region;
+    float gl_uv[8] = {
+        (tile_rect.p4().x() - top_left.x()) / width,
+        (tile_rect.p4().y() - top_left.y()) / height,
+        (tile_rect.p1().x() - top_left.x()) / width,
+        (tile_rect.p1().y() - top_left.y()) / height,
+        (tile_rect.p2().x() - top_left.x()) / width,
+        (tile_rect.p2().y() - top_left.y()) / height,
+        (tile_rect.p3().x() - top_left.x()) / width,
+        (tile_rect.p3().y() - top_left.y()) / height,
+    };
+    PrepareGeometry(CLIPPED_BINDING);
+    clipped_geometry_->InitializeCustomQuadWithUVs(
+        gfx::QuadF(quad->visible_rect), gl_uv);
+  } else {
+    PrepareGeometry(SHARED_BINDING);
+  }
   float gl_quad[8] = {
-    tile_rect.x(),
-    tile_rect.bottom(),
-    tile_rect.x(),
-    tile_rect.y(),
-    tile_rect.right(),
-    tile_rect.y(),
-    tile_rect.right(),
-    tile_rect.bottom(),
+      tile_rect.p4().x(),
+      tile_rect.p4().y(),
+      tile_rect.p1().x(),
+      tile_rect.p1().y(),
+      tile_rect.p2().x(),
+      tile_rect.p2().y(),
+      tile_rect.p3().x(),
+      tile_rect.p3().y(),
   };
   GLC(gl_, gl_->Uniform2fv(uniforms.quad_location, 4, gl_quad));
 
   static float gl_matrix[16];
   ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad->quadTransform());
   GLC(gl_,
       gl_->UniformMatrix4fv(uniforms.matrix_location, 1, false, &gl_matrix[0]));
 
   GLC(gl_, gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0));
 }
 
 void GLRenderer::DrawYUVVideoQuad(const DrawingFrame* frame,
-                                  const YUVVideoDrawQuad* quad) {
+                                  const YUVVideoDrawQuad* quad,
+                                  const gfx::QuadF* clip_region) {
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
       gl_,
       &highp_threshold_cache_,
       highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   bool use_alpha_plane = quad->a_plane_resource_id != 0;
 
@@ skipping 119 matching lines @@
     case YUVVideoDrawQuad::REC_709:
       yuv_to_rgb = yuv_to_rgb_rec709;
       yuv_adjust = yuv_adjust_constrained;
       break;
     case YUVVideoDrawQuad::JPEG:
       yuv_to_rgb = yuv_to_rgb_jpeg;
       yuv_adjust = yuv_adjust_full;
       break;
   }
 
+  // The transform and vertex data are used to figure out the extents that the
+  // un-antialiased quad should have and which vertex this is and the float
+  // quad passed in via uniform is the actual geometry that gets used to draw
+  // it. This is why this centered rect is used and not the original quad_rect.
+  gfx::RectF tile_rect = quad->visible_rect;
   GLC(gl_, gl_->UniformMatrix3fv(yuv_matrix_location, 1, 0, yuv_to_rgb));
   GLC(gl_, gl_->Uniform3fv(yuv_adj_location, 1, yuv_adjust));
 
   SetShaderOpacity(quad->opacity(), alpha_location);
-  DrawQuadGeometry(frame, quad->quadTransform(), quad->rect, matrix_location);
+  if (!clip_region) {
+    DrawQuadGeometry(frame, quad->quadTransform(), tile_rect, matrix_location);
+  } else {
+    float uvs[8] = {0};
+    GetScaledUVs(quad->visible_rect, clip_region, uvs);
+    gfx::QuadF region_quad = *clip_region;
+    region_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
+    region_quad -= gfx::Vector2dF(0.5f, 0.5f);
+    DrawQuadGeometryClippedByQuadF(frame, quad->quadTransform(), tile_rect,
+                                   region_quad, matrix_location, uvs);
+  }
 }
 
 void GLRenderer::DrawStreamVideoQuad(const DrawingFrame* frame,
-                                     const StreamVideoDrawQuad* quad) {
+                                     const StreamVideoDrawQuad* quad,
+                                     const gfx::QuadF* clip_region) {
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   static float gl_matrix[16];
 
   DCHECK(capabilities_.using_egl_image);
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
       gl_,
       &highp_threshold_cache_,
       highp_threshold_min_,
@@ skipping 10 matching lines @@
 
   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
                                           quad->resource_id);
   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
   GLC(gl_, gl_->BindTexture(GL_TEXTURE_EXTERNAL_OES, lock.texture_id()));
 
   GLC(gl_, gl_->Uniform1i(program->fragment_shader().sampler_location(), 0));
 
   SetShaderOpacity(quad->opacity(),
                    program->fragment_shader().alpha_location());
-  DrawQuadGeometry(frame,
-                   quad->quadTransform(),
-                   quad->rect,
-                   program->vertex_shader().matrix_location());
+  if (!clip_region) {
+    DrawQuadGeometry(frame, quad->quadTransform(), quad->rect,
+                     program->vertex_shader().matrix_location());
+  } else {
+    gfx::QuadF region_quad(*clip_region);
+    region_quad.Scale(1.0f / quad->rect.width(), 1.0f / quad->rect.height());
+    region_quad -= gfx::Vector2dF(0.5f, 0.5f);
+    float uvs[8] = {0};
+    GetScaledUVs(quad->visible_rect, clip_region, uvs);
+    DrawQuadGeometryClippedByQuadF(
+        frame, quad->quadTransform(), quad->rect, region_quad,
+        program->vertex_shader().matrix_location(), uvs);
+  }
 }
 
 struct TextureProgramBinding {
   template <class Program>
   void Set(Program* program) {
     DCHECK(program);
     program_id = program->program();
     sampler_location = program->fragment_shader().sampler_location();
     matrix_location = program->vertex_shader().matrix_location();
     background_color_location =
         program->fragment_shader().background_color_location();
   }
   int program_id;
   int sampler_location;
   int matrix_location;
+  int transform_location;
   int background_color_location;
 };
 
 struct TexTransformTextureProgramBinding : TextureProgramBinding {
   template <class Program>
   void Set(Program* program) {
     TextureProgramBinding::Set(program);
     tex_transform_location = program->vertex_shader().tex_transform_location();
     vertex_opacity_location =
         program->vertex_shader().vertex_opacity_location();
   }
   int tex_transform_location;
   int vertex_opacity_location;
 };
 
-void GLRenderer::FlushTextureQuadCache() {
+void GLRenderer::FlushTextureQuadCache(BoundGeometry flush_binding) {
   // Check to see if we have anything to draw.
   if (draw_cache_.program_id == -1)
     return;
 
+  PrepareGeometry(flush_binding);
+
   // Set the correct blending mode.
   SetBlendEnabled(draw_cache_.needs_blending);
 
   // Bind the program to the GL state.
   SetUseProgram(draw_cache_.program_id);
 
   // Bind the correct texture sampler location.
   GLC(gl_, gl_->Uniform1i(draw_cache_.sampler_location, 0));
 
   // Assume the current active textures is 0.
@@ skipping 40 matching lines @@
       gl_->DrawElements(GL_TRIANGLES,
                         6 * draw_cache_.matrix_data.size(),
                         GL_UNSIGNED_SHORT,
                         0));
 
   // Clear the cache.
   draw_cache_.program_id = -1;
   draw_cache_.uv_xform_data.resize(0);
   draw_cache_.vertex_opacity_data.resize(0);
   draw_cache_.matrix_data.resize(0);
+
+  // If we had a clipped binding, prepare the shared binding for the
+  // next inserts.
+  if (flush_binding == CLIPPED_BINDING) {
+    PrepareGeometry(SHARED_BINDING);
+  }
 }
 
 void GLRenderer::EnqueueTextureQuad(const DrawingFrame* frame,
-                                    const TextureDrawQuad* quad) {
+                                    const TextureDrawQuad* quad,
+                                    const gfx::QuadF* clip_region) {
+  // If we have a clip_region then we have to render the next quad
+  // with dynamic geometry, therefore we must flush all pending
+  // texture quads.
+  if (clip_region) {
+    // We send in false here because we want to flush what's currently in the
+    // queue using the shared_geometry and not clipped_geometry
+    FlushTextureQuadCache(SHARED_BINDING);
+  }
+
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
       gl_,
       &highp_threshold_cache_,
       highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   // Choose the correct texture program binding
   TexTransformTextureProgramBinding binding;
   if (quad->premultiplied_alpha) {
     if (quad->background_color == SK_ColorTRANSPARENT) {
@@ skipping 11 matching lines @@
   }
 
   int resource_id = quad->resource_id;
 
   if (draw_cache_.program_id != binding.program_id ||
       draw_cache_.resource_id != resource_id ||
       draw_cache_.needs_blending != quad->ShouldDrawWithBlending() ||
       draw_cache_.nearest_neighbor != quad->nearest_neighbor ||
       draw_cache_.background_color != quad->background_color ||
       draw_cache_.matrix_data.size() >= 8) {
-    FlushTextureQuadCache();
+    FlushTextureQuadCache(SHARED_BINDING);
     draw_cache_.program_id = binding.program_id;
     draw_cache_.resource_id = resource_id;
     draw_cache_.needs_blending = quad->ShouldDrawWithBlending();
     draw_cache_.nearest_neighbor = quad->nearest_neighbor;
     draw_cache_.background_color = quad->background_color;
 
     draw_cache_.uv_xform_location = binding.tex_transform_location;
     draw_cache_.background_color_location = binding.background_color_location;
     draw_cache_.vertex_opacity_location = binding.vertex_opacity_location;
     draw_cache_.matrix_location = binding.matrix_location;
     draw_cache_.sampler_location = binding.sampler_location;
   }
 
   // Generate the uv-transform
-  draw_cache_.uv_xform_data.push_back(UVTransform(quad));
+  if (!clip_region) {
+    draw_cache_.uv_xform_data.push_back(UVTransform(quad));
+  } else {
+    Float4 uv_transform = {{0.0f, 0.0f, 1.0f, 1.0f}};
+    draw_cache_.uv_xform_data.push_back(uv_transform);
+  }
 
   // Generate the vertex opacity
   const float opacity = quad->opacity();
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[0] * opacity);
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[1] * opacity);
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[2] * opacity);
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[3] * opacity);
 
   // Generate the transform matrix
   gfx::Transform quad_rect_matrix;
   QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
   quad_rect_matrix = frame->projection_matrix * quad_rect_matrix;
 
   Float16 m;
   quad_rect_matrix.matrix().asColMajorf(m.data);
   draw_cache_.matrix_data.push_back(m);
+
+  if (clip_region) {
+    gfx::QuadF scaled_region;
+    if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
+      scaled_region = SharedGeometryQuad().BoundingBox();
+    }
+    // Both the scaled region and the SharedGeomtryQuad are in the space
+    // -0.5->0.5. We need to move that to the space 0->1.
+    float uv[8];
+    uv[0] = scaled_region.p1().x() + 0.5f;
+    uv[1] = scaled_region.p1().y() + 0.5f;
+    uv[2] = scaled_region.p2().x() + 0.5f;
+    uv[3] = scaled_region.p2().y() + 0.5f;
+    uv[4] = scaled_region.p3().x() + 0.5f;
+    uv[5] = scaled_region.p3().y() + 0.5f;
+    uv[6] = scaled_region.p4().x() + 0.5f;
+    uv[7] = scaled_region.p4().y() + 0.5f;
+    PrepareGeometry(CLIPPED_BINDING);
+    clipped_geometry_->InitializeCustomQuadWithUVs(scaled_region, uv);
+    FlushTextureQuadCache(CLIPPED_BINDING);
+  }
 }
 
 void GLRenderer::DrawIOSurfaceQuad(const DrawingFrame* frame,
-                                   const IOSurfaceDrawQuad* quad) {
+                                   const IOSurfaceDrawQuad* quad,
+                                   const gfx::QuadF* clip_region) {
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
       gl_,
       &highp_threshold_cache_,
       highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   TexTransformTextureProgramBinding binding;
   binding.Set(GetTextureIOSurfaceProgram(tex_coord_precision));
@@ skipping 18 matching lines @@
 
   const float vertex_opacity[] = {quad->opacity(), quad->opacity(),
                                   quad->opacity(), quad->opacity()};
   GLC(gl_, gl_->Uniform1fv(binding.vertex_opacity_location, 4, vertex_opacity));
 
   ResourceProvider::ScopedReadLockGL lock(resource_provider_,
                                           quad->io_surface_resource_id);
   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
   GLC(gl_, gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, lock.texture_id()));
 
-  DrawQuadGeometry(
-      frame, quad->quadTransform(), quad->rect, binding.matrix_location);
+  if (!clip_region) {
+    DrawQuadGeometry(frame, quad->quadTransform(), quad->rect,
+                     binding.matrix_location);
+  } else {
+    float uvs[8] = {0};
+    GetScaledUVs(quad->visible_rect, clip_region, uvs);
+    DrawQuadGeometryClippedByQuadF(frame, quad->quadTransform(), quad->rect,
+                                   *clip_region, binding.matrix_location, uvs);
+  }
 
   GLC(gl_, gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, 0));
 }
 
 void GLRenderer::FinishDrawingFrame(DrawingFrame* frame) {
   if (use_sync_query_) {
     DCHECK(current_sync_query_);
     current_sync_query_->End();
     pending_sync_queries_.push_back(current_sync_query_.Pass());
   }
 
   current_framebuffer_lock_ = nullptr;
   swap_buffer_rect_.Union(gfx::ToEnclosingRect(frame->root_damage_rect));
 
   GLC(gl_, gl_->Disable(GL_BLEND));
   blend_shadow_ = false;
 
   ScheduleOverlays(frame);
 }
 
-void GLRenderer::FinishDrawingQuadList() { FlushTextureQuadCache(); }
+void GLRenderer::FinishDrawingQuadList() {
+  FlushTextureQuadCache(SHARED_BINDING);
+}
 
 bool GLRenderer::FlippedFramebuffer(const DrawingFrame* frame) const {
   if (frame->current_render_pass != frame->root_render_pass)
     return true;
   return FlippedRootFramebuffer();
 }
 
 bool GLRenderer::FlippedRootFramebuffer() const {
   // GL is normally flipped, so a flipped output results in an unflipping.
   return !output_surface_->capabilities().flipped_output_surface;
 }
 
 void GLRenderer::EnsureScissorTestEnabled() {
   if (is_scissor_enabled_)
     return;
 
-  FlushTextureQuadCache();
+  FlushTextureQuadCache(SHARED_BINDING);
   GLC(gl_, gl_->Enable(GL_SCISSOR_TEST));
   is_scissor_enabled_ = true;
 }
 
 void GLRenderer::EnsureScissorTestDisabled() {
   if (!is_scissor_enabled_)
     return;
 
-  FlushTextureQuadCache();
+  FlushTextureQuadCache(SHARED_BINDING);
   GLC(gl_, gl_->Disable(GL_SCISSOR_TEST));
   is_scissor_enabled_ = false;
 }
 
 void GLRenderer::CopyCurrentRenderPassToBitmap(
     DrawingFrame* frame,
     scoped_ptr<CopyOutputRequest> request) {
   TRACE_EVENT0("cc", "GLRenderer::CopyCurrentRenderPassToBitmap");
   gfx::Rect copy_rect = frame->current_render_pass->output_rect;
   if (request->has_area())
@@ skipping 48 matching lines @@
   blend_shadow_ = enabled;
 }
 
 void GLRenderer::SetUseProgram(unsigned program) {
   if (program == program_shadow_)
     return;
   gl_->UseProgram(program);
   program_shadow_ = program;
 }
 
+void GLRenderer::DrawQuadGeometryClippedByQuadF(
+    const DrawingFrame* frame,
+    const gfx::Transform& draw_transform,
+    const gfx::RectF& quad_rect,
+    const gfx::QuadF& clipping_region_quad,
+    int matrix_location,
+    const float* uvs) {
+  PrepareGeometry(CLIPPED_BINDING);
+  if (uvs) {
+    clipped_geometry_->InitializeCustomQuadWithUVs(clipping_region_quad, uvs);
+  } else {
+    clipped_geometry_->InitializeCustomQuad(clipping_region_quad);
+  }
+  gfx::Transform quad_rect_matrix;
+  QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
+  static float gl_matrix[16];
+  ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
+  GLC(gl_, gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]));
+
+  GLC(gl_, gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT,
+                             reinterpret_cast<const void*>(0)));
+}
+
 void GLRenderer::DrawQuadGeometry(const DrawingFrame* frame,
                                   const gfx::Transform& draw_transform,
                                   const gfx::RectF& quad_rect,
                                   int matrix_location) {
+  PrepareGeometry(SHARED_BINDING);
   gfx::Transform quad_rect_matrix;
   QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
   static float gl_matrix[16];
   ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
   GLC(gl_, gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]));
 
   GLC(gl_, gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0));
 }
 
 void GLRenderer::Finish() {
@@ skipping 42 matching lines @@
 
 void GLRenderer::EnforceMemoryPolicy() {
   if (!visible()) {
     TRACE_EVENT0("cc", "GLRenderer::EnforceMemoryPolicy dropping resources");
     ReleaseRenderPassTextures();
     DiscardBackbuffer();
     resource_provider_->ReleaseCachedData();
     output_surface_->context_provider()->DeleteCachedResources();
     GLC(gl_, gl_->Flush());
   }
+  PrepareGeometry(NO_BINDING);
 }
 
 void GLRenderer::DiscardBackbuffer() {
   if (is_backbuffer_discarded_)
     return;
 
   output_surface_->DiscardBackbuffer();
 
   is_backbuffer_discarded_ = true;
 
@@ skipping 311 matching lines @@
 
 void GLRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
   EnsureScissorTestEnabled();
 
   // Don't unnecessarily ask the context to change the scissor, because it
   // may cause undesired GPU pipeline flushes.
   if (scissor_rect == scissor_rect_ && !scissor_rect_needs_reset_)
     return;
 
   scissor_rect_ = scissor_rect;
-  FlushTextureQuadCache();
+  FlushTextureQuadCache(SHARED_BINDING);
   GLC(gl_,
       gl_->Scissor(scissor_rect.x(),
                    scissor_rect.y(),
                    scissor_rect.width(),
                    scissor_rect.height()));
 
   scissor_rect_needs_reset_ = false;
 }
 
 void GLRenderer::SetDrawViewport(const gfx::Rect& window_space_viewport) {
   viewport_ = window_space_viewport;
   GLC(gl_,
       gl_->Viewport(window_space_viewport.x(),
                     window_space_viewport.y(),
                     window_space_viewport.width(),
                     window_space_viewport.height()));
 }
 
 void GLRenderer::InitializeSharedObjects() {
   TRACE_EVENT0("cc", "GLRenderer::InitializeSharedObjects");
 
   // Create an FBO for doing offscreen rendering.
   GLC(gl_, gl_->GenFramebuffers(1, &offscreen_framebuffer_id_));
 
-  shared_geometry_ = make_scoped_ptr(
-      new GeometryBinding(gl_, QuadVertexRect()));
+  shared_geometry_ =
+      make_scoped_ptr(new StaticGeometryBinding(gl_, QuadVertexRect()));
+  clipped_geometry_ = make_scoped_ptr(new DynamicGeometryBinding(gl_));
+}
+
+void GLRenderer::PrepareGeometry(BoundGeometry binding) {
+  if (binding == bound_geometry_) {
+    return;
+  }
+
+  switch (binding) {
+    case SHARED_BINDING:
+      shared_geometry_->PrepareForDraw();
+      break;
+    case CLIPPED_BINDING:
+      clipped_geometry_->PrepareForDraw();
+      break;
+    case NO_BINDING:
+      break;
+  }
+  bound_geometry_ = binding;
 }
 
 const GLRenderer::TileCheckerboardProgram*
 GLRenderer::GetTileCheckerboardProgram() {
   if (!tile_checkerboard_program_.initialized()) {
     TRACE_EVENT0("cc", "GLRenderer::checkerboardProgram::initalize");
     tile_checkerboard_program_.Initialize(output_surface_->context_provider(),
                                           TEX_COORD_PRECISION_NA,
                                           SAMPLER_TYPE_NA);
   }
@@ skipping 444 matching lines @@
   scissor_rect_needs_reset_ = true;
   stencil_shadow_ = false;
   blend_shadow_ = true;
   program_shadow_ = 0;
 
   RestoreGLState();
 }
 
 void GLRenderer::RestoreGLState() {
   // This restores the current GLRenderer state to the GL context.
-
-  shared_geometry_->PrepareForDraw();
+  bound_geometry_ = NO_BINDING;
+  PrepareGeometry(SHARED_BINDING);
 
   GLC(gl_, gl_->Disable(GL_DEPTH_TEST));
   GLC(gl_, gl_->Disable(GL_CULL_FACE));
   GLC(gl_, gl_->ColorMask(true, true, true, true));
   GLC(gl_, gl_->BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA));
   GLC(gl_, gl_->ActiveTexture(GL_TEXTURE0));
 
   if (program_shadow_)
     gl_->UseProgram(program_shadow_);
 
@@ skipping 47 matching lines @@
     context_support_->ScheduleOverlayPlane(
         overlay.plane_z_order,
         overlay.transform,
         pending_overlay_resources_.back()->texture_id(),
         overlay.display_rect,
         overlay.uv_rect);
   }
 }
 
 }  // namespace cc