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// 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/picture_pile_base.h"
#include <algorithm>
#include <vector>
#include "base/logging.h"
#include "base/values.h"
#include "cc/base/math_util.h"
#include "cc/debug/traced_value.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/rect_conversions.h"
namespace {
// Dimensions of the tiles in this picture pile as well as the dimensions of
// the base picture in each tile.
const int kBasePictureSize = 3000;
const int kTileGridBorderPixels = 1;
}
namespace cc {
PicturePileBase::PicturePileBase()
: min_contents_scale_(0),
background_color_(SkColorSetARGBInline(0, 0, 0, 0)),
slow_down_raster_scale_factor_for_debug_(0),
show_debug_picture_borders_(false),
num_raster_threads_(0) {
tiling_.SetMaxTextureSize(gfx::Size(kBasePictureSize, kBasePictureSize));
tile_grid_info_.fTileInterval.setEmpty();
tile_grid_info_.fMargin.setEmpty();
tile_grid_info_.fOffset.setZero();
}
PicturePileBase::PicturePileBase(const PicturePileBase* other)
: picture_list_map_(other->picture_list_map_),
tiling_(other->tiling_),
recorded_region_(other->recorded_region_),
min_contents_scale_(other->min_contents_scale_),
tile_grid_info_(other->tile_grid_info_),
background_color_(other->background_color_),
slow_down_raster_scale_factor_for_debug_(
other->slow_down_raster_scale_factor_for_debug_),
show_debug_picture_borders_(other->show_debug_picture_borders_),
num_raster_threads_(other->num_raster_threads_) {
}
PicturePileBase::PicturePileBase(
const PicturePileBase* other, unsigned thread_index)
: tiling_(other->tiling_),
recorded_region_(other->recorded_region_),
min_contents_scale_(other->min_contents_scale_),
tile_grid_info_(other->tile_grid_info_),
background_color_(other->background_color_),
slow_down_raster_scale_factor_for_debug_(
other->slow_down_raster_scale_factor_for_debug_),
show_debug_picture_borders_(other->show_debug_picture_borders_),
num_raster_threads_(other->num_raster_threads_) {
const PictureListMap& other_pic_list_map = other->picture_list_map_;
for (PictureListMap::const_iterator map_iter = other_pic_list_map.begin();
map_iter != other_pic_list_map.end(); ++map_iter) {
PictureList& pic_list = picture_list_map_[map_iter->first];
const PictureList& other_pic_list = map_iter->second;
for (PictureList::const_iterator pic_iter = other_pic_list.begin();
pic_iter != other_pic_list.end(); ++pic_iter) {
pic_list.push_back(
(*pic_iter)->GetCloneForDrawingOnThread(thread_index));
}
}
}
PicturePileBase::~PicturePileBase() {
}
void PicturePileBase::Resize(gfx::Size new_size) {
if (size() == new_size)
return;
gfx::Size old_size = size();
tiling_.SetTotalSize(new_size);
// Find all tiles that contain any pixels outside the new size.
std::vector<PictureListMapKey> to_erase;
int min_toss_x = tiling_.FirstBorderTileXIndexFromSrcCoord(
std::min(old_size.width(), new_size.width()));
int min_toss_y = tiling_.FirstBorderTileYIndexFromSrcCoord(
std::min(old_size.height(), new_size.height()));
for (PictureListMap::iterator iter = picture_list_map_.begin();
iter != picture_list_map_.end(); ++iter) {
if (iter->first.first < min_toss_x && iter->first.second < min_toss_y)
continue;
to_erase.push_back(iter->first);
}
for (size_t i = 0; i < to_erase.size(); ++i)
picture_list_map_.erase(to_erase[i]);
}
void PicturePileBase::SetMinContentsScale(float min_contents_scale) {
DCHECK(min_contents_scale);
if (min_contents_scale_ == min_contents_scale)
return;
// Picture contents are played back scaled. When the final contents scale is
// less than 1 (i.e. low res), then multiple recorded pixels will be used
// to raster one final pixel. To avoid splitting a final pixel across
// pictures (which would result in incorrect rasterization due to blending), a
// buffer margin is added so that any picture can be snapped to integral
// final pixels.
//
// For example, if a 1/4 contents scale is used, then that would be 3 buffer
// pixels, since that's the minimum number of pixels to add so that resulting
// content can be snapped to a four pixel aligned grid.
int buffer_pixels = static_cast<int>(ceil(1 / min_contents_scale) - 1);
buffer_pixels = std::max(0, buffer_pixels);
SetBufferPixels(buffer_pixels);
min_contents_scale_ = min_contents_scale;
}
void PicturePileBase::SetTileGridSize(gfx::Size tile_grid_size) {
tile_grid_info_.fTileInterval.set(
tile_grid_size.width() - 2 * kTileGridBorderPixels,
tile_grid_size.height() - 2 * kTileGridBorderPixels);
DCHECK_GT(tile_grid_info_.fTileInterval.width(), 0);
DCHECK_GT(tile_grid_info_.fTileInterval.height(), 0);
tile_grid_info_.fMargin.set(kTileGridBorderPixels,
kTileGridBorderPixels);
// Offset the tile grid coordinate space to take into account the fact
// that the top-most and left-most tiles do not have top and left borders
// respectively.
tile_grid_info_.fOffset.set(-kTileGridBorderPixels,
-kTileGridBorderPixels);
}
void PicturePileBase::SetBufferPixels(int new_buffer_pixels) {
if (new_buffer_pixels == buffer_pixels())
return;
Clear();
tiling_.SetBorderTexels(new_buffer_pixels);
}
void PicturePileBase::Clear() {
picture_list_map_.clear();
}
void PicturePileBase::UpdateRecordedRegion() {
recorded_region_.Clear();
for (int x = 0; x < num_tiles_x(); ++x) {
for (int y = 0; y < num_tiles_y(); ++y) {
if (!HasRecordingAt(x, y))
continue;
recorded_region_.Union(tile_bounds(x, y));
}
}
}
bool PicturePileBase::HasRecordingAt(int x, int y) {
PictureListMap::iterator found =
picture_list_map_.find(PictureListMapKey(x, y));
if (found == picture_list_map_.end())
return false;
DCHECK(!found->second.empty());
return true;
}
bool PicturePileBase::CanRaster(float contents_scale, gfx::Rect content_rect) {
if (tiling_.total_size().IsEmpty())
return false;
gfx::Rect layer_rect = gfx::ScaleToEnclosingRect(
content_rect, 1.f / contents_scale);
layer_rect.Intersect(gfx::Rect(tiling_.total_size()));
return recorded_region_.Contains(layer_rect);
}
scoped_ptr<base::Value> PicturePileBase::AsValue() const {
scoped_ptr<base::ListValue> pictures(new base::ListValue());
gfx::Rect layer_rect(tiling_.total_size());
for (TilingData::Iterator tile_iter(&tiling_, layer_rect);
tile_iter; ++tile_iter) {
PictureListMap::const_iterator map_iter =
picture_list_map_.find(tile_iter.index());
if (map_iter == picture_list_map_.end())
continue;
const PictureList& pic_list= map_iter->second;
if (pic_list.empty())
continue;
for (PictureList::const_reverse_iterator i = pic_list.rbegin();
i != pic_list.rend(); ++i) {
Picture* picture = (*i).get();
pictures->Append(TracedValue::CreateIDRef(picture).release());
}
}
return pictures.PassAs<base::Value>();
}
} // namespace cc
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