cc/tiles/decoded_image_tracker.cc

   1 // Copyright 2016 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/tiles/decoded_image_tracker.h"
   6 #include "base/trace_event/trace_event.h"
   7
   8 namespace cc {
   9 namespace {
  10 const int kNumFramesToLock = 2;
  11 }  // namespace
  12
  13 DecodedImageTracker::DecodedImageTracker() = default;
  14 DecodedImageTracker::~DecodedImageTracker() {
  15   for (auto& pair : locked_images_)
  16     image_controller_->UnlockImageDecode(pair.first);
  17 }
  18
  19 void DecodedImageTracker::QueueImageDecode(
  20     const PaintImage& image,
  21     const gfx::ColorSpace& target_color_space,
  22     const base::Callback<void(bool)>& callback) {
  23   TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
  24                "DecodedImageTracker::QueueImageDecode", "frame_key",
  25                image.GetKeyForFrame(image.frame_index()).ToString());
  26   DCHECK(image_controller_);
  27   // Queue the decode in the image controller, but switch out the callback for
  28   // our own.
  29   auto image_bounds = SkIRect::MakeWH(image.width(), image.height());
  30   DrawImage draw_image(image, image_bounds, kNone_SkFilterQuality,
  31                        SkMatrix::I(), image.frame_index(), target_color_space);
  32   image_controller_->QueueImageDecode(
  33       draw_image, base::Bind(&DecodedImageTracker::ImageDecodeFinished,
  34                              base::Unretained(this), callback));
  35 }
  36
  37 void DecodedImageTracker::NotifyFrameFinished() {
  38   // Go through the images and if the frame ref count goes to 0, unlock the
  39   // image in the controller.
  40   for (auto it = locked_images_.begin(); it != locked_images_.end();) {
  41     auto id = it->first;
  42     int& ref_count = it->second;
  43     if (--ref_count != 0) {
  44       ++it;
  45       continue;
  46     }
  47     image_controller_->UnlockImageDecode(id);
  48     it = locked_images_.erase(it);
  49   }
  50 }
  51
  52 void DecodedImageTracker::ImageDecodeFinished(
  53     const base::Callback<void(bool)>& callback,
  54     ImageController::ImageDecodeRequestId id,
  55     ImageController::ImageDecodeResult result) {
  56   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
  57                "DecodedImageTracker::ImageDecodeFinished");
  58
  59   if (result == ImageController::ImageDecodeResult::SUCCESS)
  60     locked_images_.push_back(std::make_pair(id, kNumFramesToLock));
  61   bool decode_succeeded =
  62       result == ImageController::ImageDecodeResult::SUCCESS ||
  63       result == ImageController::ImageDecodeResult::DECODE_NOT_REQUIRED;
  64   callback.Run(decode_succeeded);
  65 }
  66
  67 }  // namespace cc