cc: Add ability to request copy of compositor output as a texture.

This adds the ability to request the compositor's output as a texture
instead of requiring a readback to a SkBitmap on the cpu. This will
allow the embedder to make a request for a texture and then scale or
sample it without reading back the entire full-sized texture to the
cpu.

To readback successive frames will require constant commits at this time,
but the mechanism could be extended to allow one main thread request to
result in multiple copy result callbacks.

This is tested by the LayerTreeHostPixelTestReadback tests. I've added a
viewport offset, and surface expansion size, to all of the LayerTreeTest
based pixel tests. This exposed a bug in the math for background filters
when a viewport offset/surface expansion size is present, so this is
fixed as well to make the tests pass (one line in
GLRenderer::ApplyBackgroundFilters).

Instead of having the CopyOutputRequest return a SkBitmap directly, or
return a TextureMailbox directly (sometimes backed by a software bitmap),
I've added a CopyOutputResult class to return with a reply from the
compositor. This reply may be a texture (via a TextureMailbox) or a
bitmap (via an SkBitmap). The embedder should be able to handle either
one when it makes a request, unless its request forces a software-bitmap
reply.

The tests verify GLRenderer+general request, GLRenderer+forced software
request, and SoftwareRenderer+general request. Adding the offset/expansion
to the viewport/surface causes the offaxis background blur pixel test to
become off-by-one in 5 pixels, requiring a rebaseline.

R=enne, jamesr, piman
BUG=242571

Review URL: https://chromiumcodereview.appspot.com/17018002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207037 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 117 insertions, 60 deletions

diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index fb5de4e..2a27ff7 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -21,6 +21,7 @@
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/copy_output_request.h"
+#include "cc/output/copy_output_result.h"
 #include "cc/output/geometry_binding.h"
 #include "cc/output/gl_frame_data.h"
 #include "cc/output/output_surface.h"
@@ -136,7 +137,8 @@ GLRenderer::GLRenderer(RendererClient* client,
       is_scissor_enabled_(false),
       highp_threshold_min_(highp_threshold_min),
       highp_threshold_cache_(0),
-      on_demand_tile_raster_resource_id_(0) {
+      on_demand_tile_raster_resource_id_(0),
+      weak_factory_(this) {
   DCHECK(context_);
 }
 
@@ -599,19 +601,29 @@ scoped_ptr<ScopedResource> GLRenderer::DrawBackgroundFilters(
 
   // FIXME: Do a single readback for both the surface and replica and cache the
   // filtered results (once filter textures are not reused).
-  gfx::Rect device_rect = gfx::ToEnclosingRect(MathUtil::MapClippedRect(
+  gfx::Rect window_rect = gfx::ToEnclosingRect(MathUtil::MapClippedRect(
       contents_device_transform, SharedGeometryQuad().BoundingBox()));
 
   int top, right, bottom, left;
   filters.getOutsets(top, right, bottom, left);
-  device_rect.Inset(-left, -top, -right, -bottom);
+  window_rect.Inset(-left, -top, -right, -bottom);
 
-  device_rect.Intersect(frame->current_render_pass->output_rect);
+  window_rect.Intersect(
+      MoveFromDrawToWindowSpace(frame->current_render_pass->output_rect));
 
   scoped_ptr<ScopedResource> device_background_texture =
       ScopedResource::create(resource_provider_);
-  if (!GetFramebufferTexture(device_background_texture.get(), device_rect))
+  if (!device_background_texture->Allocate(window_rect.size(),
+                                           GL_RGB,
+                                           ResourceProvider::TextureUsageAny)) {
     return scoped_ptr<ScopedResource>();
+  } else {
+    ResourceProvider::ScopedWriteLockGL lock(resource_provider_,
+                                             device_background_texture->id());
+    GetFramebufferTexture(lock.texture_id(),
+                          device_background_texture->format(),
+                          window_rect);
+  }
 
   SkBitmap filtered_device_background =
       ApplyFilters(this, filters, device_background_texture.get());
@@ -658,7 +670,7 @@ scoped_ptr<ScopedResource> GLRenderer::DrawBackgroundFilters(
 
     CopyTextureToFramebuffer(frame,
                              filtered_device_background_texture_id,
-                             device_rect,
+                             window_rect,
                              device_to_framebuffer_transform,
                              flip_vertically);
   }
@@ -2135,11 +2147,20 @@ void GLRenderer::GetFramebufferPixels(void* pixels, gfx::Rect rect) {
                                     pending_read.Pass());
 
   // This is a syncronous call since the callback is null.
+  gfx::Rect window_rect = MoveFromDrawToWindowSpace(rect);
   DoGetFramebufferPixels(static_cast<uint8*>(pixels),
-                         rect,
+                         window_rect,
                          AsyncGetFramebufferPixelsCleanupCallback());
 }
 
+void GLRenderer::DeleteTextureReleaseCallback(unsigned texture_id,
+                                              unsigned sync_point,
+                                              bool lost_resource) {
+  if (sync_point)
+    context_->waitSyncPoint(sync_point);
+  context_->deleteTexture(texture_id);
+}
+
 void GLRenderer::GetFramebufferPixelsAsync(
     gfx::Rect rect, scoped_ptr<CopyOutputRequest> request) {
   DCHECK(!request->IsEmpty());
@@ -2148,8 +2169,56 @@ void GLRenderer::GetFramebufferPixelsAsync(
   if (rect.IsEmpty())
     return;
 
+  DCHECK(gfx::Rect(current_surface_size_).Contains(rect)) <<
+      "current_surface_size_: " << current_surface_size_.ToString() <<
+      " rect: " << rect.ToString();
+
+  gfx::Rect window_rect = MoveFromDrawToWindowSpace(rect);
+
+  if (!request->force_bitmap_result()) {
+    unsigned int texture_id = context_->createTexture();
+    GLC(context_, context_->bindTexture(GL_TEXTURE_2D, texture_id));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
+    GetFramebufferTexture(texture_id, GL_RGBA, window_rect);
+
+    gpu::Mailbox mailbox;
+    unsigned sync_point = 0;
+    GLC(context_, context_->genMailboxCHROMIUM(mailbox.name));
+    if (mailbox.IsZero()) {
+      context_->deleteTexture(texture_id);
+      request->SendResult(CopyOutputResult::CreateEmptyResult());
+      return;
+    }
+
+    GLC(context_, context_->bindTexture(GL_TEXTURE_2D, texture_id));
+    GLC(context_, context_->produceTextureCHROMIUM(
+        GL_TEXTURE_2D, mailbox.name));
+    GLC(context_, context_->bindTexture(GL_TEXTURE_2D, 0));
+    sync_point = context_->insertSyncPoint();
+    scoped_ptr<TextureMailbox> texture_mailbox = make_scoped_ptr(
+        new TextureMailbox(mailbox,
+                           base::Bind(&GLRenderer::DeleteTextureReleaseCallback,
+                                      weak_factory_.GetWeakPtr(),
+                                      texture_id),
+                           GL_TEXTURE_2D,
+                           sync_point));
+    request->SendTextureResult(window_rect.size(), texture_mailbox.Pass());
+    return;
+  }
+
+  DCHECK(request->force_bitmap_result());
+
   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
-  bitmap->setConfig(SkBitmap::kARGB_8888_Config, rect.width(), rect.height());
+  bitmap->setConfig(SkBitmap::kARGB_8888_Config,
+                    window_rect.width(),
+                    window_rect.height());
   bitmap->allocPixels();
 
   scoped_ptr<SkAutoLockPixels> lock(new SkAutoLockPixels(*bitmap));
@@ -2169,14 +2238,15 @@ void GLRenderer::GetFramebufferPixelsAsync(
                                     pending_read.Pass());
 
   // This is an asyncronous call since the callback is not null.
-  DoGetFramebufferPixels(pixels, rect, cleanup_callback);
+  DoGetFramebufferPixels(pixels, window_rect, cleanup_callback);
 }
 
 void GLRenderer::DoGetFramebufferPixels(
     uint8* dest_pixels,
-    gfx::Rect rect,
+    gfx::Rect window_rect,
     const AsyncGetFramebufferPixelsCleanupCallback& cleanup_callback) {
-  gfx::Rect window_rect = MoveFromDrawToWindowSpace(rect);
+  DCHECK_GE(window_rect.x(), 0);
+  DCHECK_GE(window_rect.y(), 0);
   DCHECK_LE(window_rect.right(), current_surface_size_.width());
   DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
 
@@ -2198,48 +2268,37 @@ void GLRenderer::DoGetFramebufferPixels(
 
     temporary_texture = context_->createTexture();
     GLC(context_, context_->bindTexture(GL_TEXTURE_2D, temporary_texture));
-    GLC(context_,
-        context_->texParameteri(
-            GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
-    GLC(context_,
-        context_->texParameteri(
-            GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
-    GLC(context_,
-        context_->texParameteri(
-            GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
-    GLC(context_,
-        context_->texParameteri(
-            GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
+    GLC(context_, context_->texParameteri(
+        GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
     // Copy the contents of the current (IOSurface-backed) framebuffer into a
     // temporary texture.
-    GLC(context_,
-        context_->copyTexImage2D(GL_TEXTURE_2D,
-                                 0,
-                                 GL_RGBA,
-                                 0,
-                                 0,
-                                 current_surface_size_.width(),
-                                 current_surface_size_.height(),
-                                 0));
+    GetFramebufferTexture(temporary_texture,
+                          GL_RGBA,
+                          gfx::Rect(current_surface_size_));
     temporary_fbo = context_->createFramebuffer();
     // Attach this texture to an FBO, and perform the readback from that FBO.
     GLC(context_, context_->bindFramebuffer(GL_FRAMEBUFFER, temporary_fbo));
-    GLC(context_,
-        context_->framebufferTexture2D(GL_FRAMEBUFFER,
-                                       GL_COLOR_ATTACHMENT0,
-                                       GL_TEXTURE_2D,
-                                       temporary_texture,
-                                       0));
+    GLC(context_, context_->framebufferTexture2D(GL_FRAMEBUFFER,
+                                                 GL_COLOR_ATTACHMENT0,
+                                                 GL_TEXTURE_2D,
+                                                 temporary_texture,
+                                                 0));
 
-    DCHECK(context_->checkFramebufferStatus(GL_FRAMEBUFFER) ==
-           GL_FRAMEBUFFER_COMPLETE);
+    DCHECK_EQ(static_cast<unsigned>(GL_FRAMEBUFFER_COMPLETE),
+              context_->checkFramebufferStatus(GL_FRAMEBUFFER));
   }
 
   unsigned buffer = context_->createBuffer();
   GLC(context_, context_->bindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
                                      buffer));
   GLC(context_, context_->bufferData(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
-                                     4 * rect.size().GetArea(),
+                                     4 * window_rect.size().GetArea(),
                                      NULL,
                                      GL_STREAM_READ));
 
@@ -2269,7 +2328,7 @@ void GLRenderer::DoGetFramebufferPixels(
                  cleanup_callback,
                  buffer,
                  dest_pixels,
-                 rect.size());
+                 window_rect.size());
   // Save the finished_callback so it can be cancelled.
   pending_async_read_pixels_.front()->finished_read_pixels_callback.Reset(
       finished_callback);
@@ -2348,35 +2407,33 @@ void GLRenderer::PassOnSkBitmap(
     scoped_ptr<SkAutoLockPixels> lock,
     scoped_ptr<CopyOutputRequest> request,
     bool success) {
-  DCHECK(request->HasBitmapRequest());
+  DCHECK(request->force_bitmap_result());
 
   lock.reset();
   if (success)
     request->SendBitmapResult(bitmap.Pass());
 }
 
-bool GLRenderer::GetFramebufferTexture(ScopedResource* texture,
-                                       gfx::Rect device_rect) {
-  DCHECK(!texture->id() || (texture->size() == device_rect.size() &&
-                            texture->format() == GL_RGB));
-
-  if (!texture->id() && !texture->Allocate(device_rect.size(),
-                                           GL_RGB,
-                                           ResourceProvider::TextureUsageAny))
-    return false;
+void GLRenderer::GetFramebufferTexture(unsigned texture_id,
+                                       unsigned texture_format,
+                                       gfx::Rect window_rect) {
+  DCHECK(texture_id);
+  DCHECK_GE(window_rect.x(), 0);
+  DCHECK_GE(window_rect.y(), 0);
+  DCHECK_LE(window_rect.right(), current_surface_size_.width());
+  DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
 
-  ResourceProvider::ScopedWriteLockGL lock(resource_provider_, texture->id());
-  GLC(context_, context_->bindTexture(GL_TEXTURE_2D, lock.texture_id()));
+  GLC(context_, context_->bindTexture(GL_TEXTURE_2D, texture_id));
   GLC(context_,
       context_->copyTexImage2D(GL_TEXTURE_2D,
                                0,
-                               texture->format(),
-                               device_rect.x(),
-                               device_rect.y(),
-                               device_rect.width(),
-                               device_rect.height(),
+                               texture_format,
+                               window_rect.x(),
+                               window_rect.y(),
+                               window_rect.width(),
+                               window_rect.height(),
                                0));
-  return true;
+  GLC(context_, context_->bindTexture(GL_TEXTURE_2D, 0));
 }
 
 bool GLRenderer::UseScopedTexture(DrawingFrame* frame,