cc: Partial tile update for one-copy raster.

cc/resources/tile_task_worker_pool.cc

 // Copyright 2013 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/resources/tile_task_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/resources/raster_source.h"
@@ skipping 142 matching lines @@
   return false;
 }
 
 // static
 void TileTaskWorkerPool::PlaybackToMemory(void* memory,
                                           ResourceFormat format,
                                           const gfx::Size& size,
                                           int stride,
                                           const RasterSource* raster_source,
                                           const gfx::Rect& rect,
-                                          float scale) {
+                                          const gfx::Vector2d& raster_offset,
+                                          float scale,
+                                          bool partial_update) {
   DCHECK(IsSupportedPlaybackToMemoryFormat(format)) << format;
 
   // Uses kPremul_SkAlphaType since the result is not known to be opaque.
   SkImageInfo info =
       SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType);
   SkColorType buffer_color_type = ResourceFormatToSkColorType(format);
   bool needs_copy = buffer_color_type != info.colorType();
 
   // Use unknown pixel geometry to disable LCD text.
   SkSurfaceProps surface_props(0, kUnknown_SkPixelGeometry);
   if (raster_source->CanUseLCDText()) {
     // LegacyFontHost will get LCD text and skia figures out what type to use.
     surface_props = SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType);
   }
 
   if (!stride)
     stride = info.minRowBytes();
   DCHECK_GT(stride, 0);
 
   if (!needs_copy) {
     skia::RefPtr<SkSurface> surface = skia::AdoptRef(
         SkSurface::NewRasterDirect(info, memory, stride, &surface_props));
     skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
-    raster_source->PlaybackToCanvas(canvas.get(), rect, scale);
+    canvas->translate(raster_offset.x(), raster_offset.y());
+    raster_source->PlaybackToCanvas(canvas.get(), rect, scale, partial_update);
     return;
   }
 
   skia::RefPtr<SkSurface> surface =
       skia::AdoptRef(SkSurface::NewRaster(info, &surface_props));
   skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
-  raster_source->PlaybackToCanvas(canvas.get(), rect, scale);
+  canvas->translate(raster_offset.x(), raster_offset.y());
+  raster_source->PlaybackToCanvas(canvas.get(), rect, scale, partial_update);
 
   SkImageInfo dst_info = info;
   dst_info.fColorType = buffer_color_type;
   // TODO(kaanb): The GL pipeline assumes a 4-byte alignment for the
   // bitmap data. There will be no need to call SkAlign4 once crbug.com/293728
   // is fixed.
   const size_t dst_row_bytes = SkAlign4(dst_info.minRowBytes());
   DCHECK_EQ(0u, dst_row_bytes % 4);
   bool success = canvas->readPixels(dst_info, memory, dst_row_bytes, 0, 0);
   DCHECK_EQ(true, success);
 }
 
 }  // namespace cc