cc: Refactor TileTaskWorkerPool.

cc/raster/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/raster/tile_task_worker_pool.h"
-
-#include <stddef.h>
-
-#include "base/trace_event/trace_event.h"
-#include "cc/playback/raster_source.h"
-#include "cc/raster/texture_compressor.h"
-#include "cc/resources/platform_color.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-#include "third_party/skia/include/core/SkSurface.h"
-
-namespace cc {
-
-TileTaskWorkerPool::TileTaskWorkerPool() {}
-
-TileTaskWorkerPool::~TileTaskWorkerPool() {}
-
-// static
-void TileTaskWorkerPool::ScheduleTasksOnOriginThread(
-    RasterBufferProvider* provider,
-    TaskGraph* graph) {
-  TRACE_EVENT0("cc", "TileTaskWorkerPool::ScheduleTasksOnOriginThread");
-
-  for (TaskGraph::Node::Vector::iterator it = graph->nodes.begin();
-       it != graph->nodes.end(); ++it) {
-    TaskGraph::Node& node = *it;
-    TileTask* task = static_cast<TileTask*>(node.task);
-
-    if (!task->HasBeenScheduled()) {
-      task->WillSchedule();
-      task->ScheduleOnOriginThread(provider);
-      task->DidSchedule();
-    }
-  }
-}
-
-namespace {
-
-bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
-  switch (format) {
-    case RGBA_4444:
-    case RGBA_8888:
-    case BGRA_8888:
-    case ETC1:
-      return true;
-    case ALPHA_8:
-    case LUMINANCE_8:
-    case RGB_565:
-    case RED_8:
-    case LUMINANCE_F16:
-      return false;
-  }
-  NOTREACHED();
-  return false;
-}
-
-}  // anonymous namespace
-
-// static
-void TileTaskWorkerPool::PlaybackToMemory(
-    void* memory,
-    ResourceFormat format,
-    const gfx::Size& size,
-    size_t stride,
-    const RasterSource* raster_source,
-    const gfx::Rect& canvas_bitmap_rect,
-    const gfx::Rect& canvas_playback_rect,
-    float scale,
-    const RasterSource::PlaybackSettings& playback_settings) {
-  TRACE_EVENT0("cc", "TileTaskWorkerPool::PlaybackToMemory");
-
-  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);
-
-  // 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, 0u);
-
-  switch (format) {
-    case RGBA_8888:
-    case BGRA_8888: {
-      sk_sp<SkSurface> surface =
-          SkSurface::MakeRasterDirect(info, memory, stride, &surface_props);
-      raster_source->PlaybackToCanvas(surface->getCanvas(), canvas_bitmap_rect,
-                                      canvas_playback_rect, scale,
-                                      playback_settings);
-      return;
-    }
-    case RGBA_4444:
-    case ETC1: {
-      sk_sp<SkSurface> surface = SkSurface::MakeRaster(info, &surface_props);
-      // TODO(reveman): Improve partial raster support by reducing the size of
-      // playback rect passed to PlaybackToCanvas. crbug.com/519070
-      raster_source->PlaybackToCanvas(surface->getCanvas(), canvas_bitmap_rect,
-                                      canvas_bitmap_rect, scale,
-                                      playback_settings);
-
-      if (format == ETC1) {
-        TRACE_EVENT0("cc",
-                     "TileTaskWorkerPool::PlaybackToMemory::CompressETC1");
-        DCHECK_EQ(size.width() % 4, 0);
-        DCHECK_EQ(size.height() % 4, 0);
-        std::unique_ptr<TextureCompressor> texture_compressor =
-            TextureCompressor::Create(TextureCompressor::kFormatETC1);
-        SkPixmap pixmap;
-        surface->peekPixels(&pixmap);
-        texture_compressor->Compress(
-            reinterpret_cast<const uint8_t*>(pixmap.addr()),
-            reinterpret_cast<uint8_t*>(memory), size.width(), size.height(),
-            TextureCompressor::kQualityHigh);
-      } else {
-        TRACE_EVENT0("cc",
-                     "TileTaskWorkerPool::PlaybackToMemory::ConvertRGBA4444");
-        SkImageInfo dst_info =
-            SkImageInfo::Make(info.width(), info.height(),
-                              ResourceFormatToClosestSkColorType(format),
-                              info.alphaType(), info.profileType());
-        bool rv = surface->readPixels(dst_info, memory, stride, 0, 0);
-        DCHECK(rv);
-      }
-      return;
-    }
-    case ALPHA_8:
-    case LUMINANCE_8:
-    case RGB_565:
-    case RED_8:
-    case LUMINANCE_F16:
-      NOTREACHED();
-      return;
-  }
-
-  NOTREACHED();
-}
-
-bool TileTaskWorkerPool::ResourceFormatRequiresSwizzle(ResourceFormat format) {
-  switch (format) {
-    case RGBA_8888:
-    case BGRA_8888:
-      // Initialize resource using the preferred PlatformColor component
-      // order and swizzle in the shader instead of in software.
-      return !PlatformColor::SameComponentOrder(format);
-    case RGBA_4444:
-    case ETC1:
-    case ALPHA_8:
-    case LUMINANCE_8:
-    case RGB_565:
-    case RED_8:
-    case LUMINANCE_F16:
-      return false;
-  }
-  NOTREACHED();
-  return false;
-}
-
-}  // namespace cc