Implement webview.captureVisibleRegion()

content/browser/compositor/delegated_frame_host.cc

 // Copyright 2014 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 "content/browser/compositor/delegated_frame_host.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 133 matching lines @@
                          (preferred_color_type == kRGB_565_SkColorType) ||
                          (preferred_color_type == kN32_SkColorType));
   DCHECK(format_support);
   if (!CanCopyToBitmap()) {
     callback.Run(SkBitmap(), content::READBACK_SURFACE_UNAVAILABLE);
     return;
   }
 
   scoped_ptr<cc::CopyOutputRequest> request =
       cc::CopyOutputRequest::CreateRequest(
-          base::Bind(&DelegatedFrameHost::CopyFromCompositingSurfaceHasResult,
-                     output_size, preferred_color_type, callback));
+          base::Bind(&CopyFromCompositingSurfaceHasResult, output_size,
+                     preferred_color_type, callback));
   if (!src_subrect.IsEmpty())
     request->set_area(src_subrect);
   RequestCopyOfOutput(std::move(request));
 }
 
 void DelegatedFrameHost::CopyFromCompositingSurfaceToVideoFrame(
     const gfx::Rect& src_subrect,
     const scoped_refptr<media::VideoFrame>& target,
     const base::Callback<void(const gfx::Rect&, bool)>& callback) {
   if (!CanCopyToVideoFrame()) {
@@ skipping 422 matching lines @@
   client_->DelegatedFrameHostGetLayer()->SetShowSolidColorContent();
   frame_provider_ = NULL;
   if (!surface_id_.is_null()) {
     surface_factory_->Destroy(surface_id_);
     surface_id_ = cc::SurfaceId();
   }
   delegated_frame_evictor_->DiscardedFrame();
 }
 
 // static
-void DelegatedFrameHost::CopyFromCompositingSurfaceHasResult(
-    const gfx::Size& dst_size_in_pixel,
-    const SkColorType color_type,
-    const ReadbackRequestCallback& callback,
-    scoped_ptr<cc::CopyOutputResult> result) {
-  if (result->IsEmpty() || result->size().IsEmpty()) {
-    callback.Run(SkBitmap(), content::READBACK_FAILED);
-    return;
-  }
-
-  gfx::Size output_size_in_pixel;
-  if (dst_size_in_pixel.IsEmpty())
-    output_size_in_pixel = result->size();
-  else
-    output_size_in_pixel = dst_size_in_pixel;
-
-  if (result->HasTexture()) {
-    // GPU-accelerated path
-    PrepareTextureCopyOutputResult(output_size_in_pixel, color_type, callback,
-                                   std::move(result));
-    return;
-  }
-
-  DCHECK(result->HasBitmap());
-  // Software path
-  PrepareBitmapCopyOutputResult(output_size_in_pixel, color_type, callback,
-                                std::move(result));
-}
-
-static void CopyFromCompositingSurfaceFinished(
-    const ReadbackRequestCallback& callback,
-    scoped_ptr<cc::SingleReleaseCallback> release_callback,
-    scoped_ptr<SkBitmap> bitmap,
-    scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock,
-    bool result) {
-  bitmap_pixels_lock.reset();
-
-  gpu::SyncToken sync_token;
-  if (result) {
-    GLHelper* gl_helper = ImageTransportFactory::GetInstance()->GetGLHelper();
-    if (gl_helper)
-      gl_helper->GenerateSyncToken(&sync_token);
-  }
-  const bool lost_resource = !sync_token.HasData();
-  release_callback->Run(sync_token, lost_resource);
-
-  callback.Run(*bitmap,
-               result ? content::READBACK_SUCCESS : content::READBACK_FAILED);
-}
-
-// static
-void DelegatedFrameHost::PrepareTextureCopyOutputResult(
-    const gfx::Size& dst_size_in_pixel,
-    const SkColorType color_type,
-    const ReadbackRequestCallback& callback,
-    scoped_ptr<cc::CopyOutputResult> result) {
-  DCHECK(result->HasTexture());
-  base::ScopedClosureRunner scoped_callback_runner(
-      base::Bind(callback, SkBitmap(), content::READBACK_FAILED));
-
-  // TODO(siva.gunturi): We should be able to validate the format here using
-  // GLHelper::IsReadbackConfigSupported before we processs the result.
-  // See crbug.com/415682 and crbug.com/415131.
-  scoped_ptr<SkBitmap> bitmap(new SkBitmap);
-  if (!bitmap->tryAllocPixels(SkImageInfo::Make(
-          dst_size_in_pixel.width(), dst_size_in_pixel.height(), color_type,
-          kOpaque_SkAlphaType))) {
-    scoped_callback_runner.Reset(base::Bind(
-        callback, SkBitmap(), content::READBACK_BITMAP_ALLOCATION_FAILURE));
-    return;
-  }
-
-  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
-  GLHelper* gl_helper = factory->GetGLHelper();
-  if (!gl_helper)
-    return;
-
-  scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock(
-      new SkAutoLockPixels(*bitmap));
-  uint8_t* pixels = static_cast<uint8_t*>(bitmap->getPixels());
-
-  cc::TextureMailbox texture_mailbox;
-  scoped_ptr<cc::SingleReleaseCallback> release_callback;
-  result->TakeTexture(&texture_mailbox, &release_callback);
-  DCHECK(texture_mailbox.IsTexture());
-
-  ignore_result(scoped_callback_runner.Release());
-
-  gl_helper->CropScaleReadbackAndCleanMailbox(
-      texture_mailbox.mailbox(), texture_mailbox.sync_token(), result->size(),
-      gfx::Rect(result->size()), dst_size_in_pixel, pixels, color_type,
-      base::Bind(&CopyFromCompositingSurfaceFinished, callback,
-                 base::Passed(&release_callback), base::Passed(&bitmap),
-                 base::Passed(&bitmap_pixels_lock)),
-      GLHelper::SCALER_QUALITY_GOOD);
-}
-
-// static
-void DelegatedFrameHost::PrepareBitmapCopyOutputResult(
-    const gfx::Size& dst_size_in_pixel,
-    const SkColorType preferred_color_type,
-    const ReadbackRequestCallback& callback,
-    scoped_ptr<cc::CopyOutputResult> result) {
-  SkColorType color_type = preferred_color_type;
-  if (color_type != kN32_SkColorType && color_type != kAlpha_8_SkColorType) {
-    // Switch back to default colortype if format not supported.
-    color_type = kN32_SkColorType;
-  }
-  DCHECK(result->HasBitmap());
-  scoped_ptr<SkBitmap> source = result->TakeBitmap();
-  DCHECK(source);
-  SkBitmap scaled_bitmap;
-  if (source->width() != dst_size_in_pixel.width() ||
-      source->height() != dst_size_in_pixel.height()) {
-    scaled_bitmap =
-        skia::ImageOperations::Resize(*source,
-                                      skia::ImageOperations::RESIZE_BEST,
-                                      dst_size_in_pixel.width(),
-                                      dst_size_in_pixel.height());
-  } else {
-    scaled_bitmap = *source;
-  }
-  if (color_type == kN32_SkColorType) {
-    DCHECK_EQ(scaled_bitmap.colorType(), kN32_SkColorType);
-    callback.Run(scaled_bitmap, READBACK_SUCCESS);
-    return;
-  }
-  DCHECK_EQ(color_type, kAlpha_8_SkColorType);
-  // The software path currently always returns N32 bitmap regardless of the
-  // |color_type| we ask for.
-  DCHECK_EQ(scaled_bitmap.colorType(), kN32_SkColorType);
-  // Paint |scaledBitmap| to alpha-only |grayscale_bitmap|.
-  SkBitmap grayscale_bitmap;
-  bool success = grayscale_bitmap.tryAllocPixels(
-      SkImageInfo::MakeA8(scaled_bitmap.width(), scaled_bitmap.height()));
-  if (!success) {
-    callback.Run(SkBitmap(), content::READBACK_BITMAP_ALLOCATION_FAILURE);
-    return;
-  }
-  SkCanvas canvas(grayscale_bitmap);
-  SkPaint paint;
-  skia::RefPtr<SkColorFilter> filter =
-      skia::AdoptRef(SkLumaColorFilter::Create());
-  paint.setColorFilter(filter.get());
-  canvas.drawBitmap(scaled_bitmap, SkIntToScalar(0), SkIntToScalar(0), &paint);
-  callback.Run(grayscale_bitmap, READBACK_SUCCESS);
-}
-
-// static
 void DelegatedFrameHost::ReturnSubscriberTexture(
     base::WeakPtr<DelegatedFrameHost> dfh,
     scoped_refptr<OwnedMailbox> subscriber_texture,
     const gpu::SyncToken& sync_token) {
   if (!subscriber_texture.get())
     return;
   if (!dfh)
     return;
 
   subscriber_texture->UpdateSyncToken(sync_token);
@@ skipping 285 matching lines @@
   vsync_interval_ = interval;
 }
 
 void DelegatedFrameHost::LockResources() {
   DCHECK(frame_provider_.get() || !surface_id_.is_null());
   delegated_frame_evictor_->LockFrame();
 }
 
 void DelegatedFrameHost::RequestCopyOfOutput(
     scoped_ptr<cc::CopyOutputRequest> request) {
-  if (!request_copy_of_output_callback_for_testing_.is_null())
+  if (!request_copy_of_output_callback_for_testing_.is_null()) {
     request_copy_of_output_callback_for_testing_.Run(std::move(request));
-  else
+  } else {
     client_->DelegatedFrameHostGetLayer()->RequestCopyOfOutput(
         std::move(request));
+  }
 }
 
 void DelegatedFrameHost::UnlockResources() {
   DCHECK(frame_provider_.get() || !surface_id_.is_null());
   delegated_frame_evictor_->UnlockFrame();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DelegatedFrameHost, ui::LayerOwnerDelegate implementation:
 
@@ skipping 11 matching lines @@
     cc::SurfaceManager* manager = factory->GetSurfaceManager();
     new_layer->SetShowSurface(
         surface_id_, base::Bind(&SatisfyCallback, base::Unretained(manager)),
         base::Bind(&RequireCallback, base::Unretained(manager)),
         current_surface_size_, current_scale_factor_,
         current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content