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// Copyright 2013 The Flutter 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 "flutter/flow/layers/layer_raster_cache_item.h"
#include "flutter/flow/layers/container_layer.h"
#include "flutter/flow/raster_cache_item.h"
#include "flutter/flow/raster_cache_util.h"
#include "third_party/skia/include/core/SkColorSpace.h"
namespace flutter {
LayerRasterCacheItem::LayerRasterCacheItem(Layer* layer,
int layer_cached_threshold,
bool can_cache_children)
: RasterCacheItem(
RasterCacheKeyID(layer->unique_id(), RasterCacheKeyType::kLayer),
// The layer raster_cache_item's cache state default value is none.
CacheState::kNone),
layer_(layer),
layer_cached_threshold_(layer_cached_threshold),
can_cache_children_(can_cache_children) {}
void LayerRasterCacheItem::PrerollSetup(PrerollContext* context,
const SkMatrix& matrix) {
cache_state_ = CacheState::kNone;
if (context->raster_cache && context->raster_cached_entries) {
context->raster_cached_entries->push_back(this);
child_items_ = context->raster_cached_entries->size();
matrix_ = matrix;
}
}
std::unique_ptr<LayerRasterCacheItem> LayerRasterCacheItem::Make(
Layer* layer,
int layer_cache_threshold,
bool can_cache_children) {
return std::make_unique<LayerRasterCacheItem>(layer, layer_cache_threshold,
can_cache_children);
}
void LayerRasterCacheItem::PrerollFinalize(PrerollContext* context,
const SkMatrix& matrix) {
if (!context->raster_cache || !context->raster_cached_entries) {
return;
}
// We've marked the cache entry that we would like to cache so it stays
// alive, but if the following conditions apply then we need to set our
// state back to kDoNotCache so that we don't populate the entry later.
if (context->has_platform_view || context->has_texture_layer ||
context->state_stack.content_culled(layer_->paint_bounds())) {
return;
}
child_items_ = context->raster_cached_entries->size() - child_items_;
if (num_cache_attempts_ >= layer_cached_threshold_) {
// the layer can be cached
cache_state_ = CacheState::kCurrent;
context->raster_cache->MarkSeen(key_id_, matrix_, true);
} else {
num_cache_attempts_++;
// access current layer
if (can_cache_children_) {
if (!layer_children_id_.has_value()) {
auto ids = RasterCacheKeyID::LayerChildrenIds(layer_);
if (!ids.has_value()) {
return;
}
layer_children_id_.emplace(std::move(ids.value()),
RasterCacheKeyType::kLayerChildren);
}
cache_state_ = CacheState::kChildren;
context->raster_cache->MarkSeen(layer_children_id_.value(), matrix_,
true);
}
}
}
std::optional<RasterCacheKeyID> LayerRasterCacheItem::GetId() const {
switch (cache_state_) {
case kCurrent:
return key_id_;
case kChildren:
return layer_children_id_;
default:
return {};
}
}
const SkRect* LayerRasterCacheItem::GetPaintBoundsFromLayer() const {
switch (cache_state_) {
case CacheState::kCurrent:
return &(layer_->paint_bounds());
case CacheState::kChildren:
FML_DCHECK(layer_->as_container_layer());
return &(layer_->as_container_layer()->child_paint_bounds());
default:
FML_DCHECK(cache_state_ != CacheState::kNone);
return nullptr;
}
}
bool Rasterize(RasterCacheItem::CacheState cache_state,
Layer* layer,
const PaintContext& paint_context,
DlCanvas* canvas) {
FML_DCHECK(cache_state != RasterCacheItem::CacheState::kNone);
LayerStateStack state_stack;
state_stack.set_delegate(canvas);
state_stack.set_checkerboard_func(
paint_context.state_stack.checkerboard_func());
PaintContext context = {
// clang-format off
.state_stack = state_stack,
.canvas = canvas,
.gr_context = paint_context.gr_context,
.dst_color_space = paint_context.dst_color_space,
.view_embedder = paint_context.view_embedder,
.raster_time = paint_context.raster_time,
.ui_time = paint_context.ui_time,
.texture_registry = paint_context.texture_registry,
.raster_cache = paint_context.raster_cache,
// clang-format on
};
switch (cache_state) {
case RasterCacheItem::CacheState::kCurrent:
FML_DCHECK(layer->needs_painting(context));
layer->Paint(context);
break;
case RasterCacheItem::CacheState::kChildren:
layer->PaintChildren(context);
break;
case RasterCacheItem::CacheState::kNone:
FML_DCHECK(cache_state != RasterCacheItem::CacheState::kNone);
return false;
}
return true;
}
static const auto* flow_type = "RasterCacheFlow::Layer";
bool LayerRasterCacheItem::TryToPrepareRasterCache(const PaintContext& context,
bool parent_cached) const {
auto maybe_id = GetId();
if (!maybe_id.has_value() || !context.raster_cache || parent_cached) {
return false;
}
if (cache_state_ != kNone) {
if (const SkRect* paint_bounds = GetPaintBoundsFromLayer()) {
RasterCache::Context r_context = {
// clang-format off
.gr_context = context.gr_context,
.dst_color_space = context.dst_color_space,
.matrix = matrix_,
.logical_rect = *paint_bounds,
.flow_type = flow_type,
// clang-format on
};
auto id = maybe_id.value();
return context.raster_cache->UpdateCacheEntry(
id, r_context,
[ctx = context, cache_state = cache_state_,
layer = layer_](DlCanvas* canvas) {
Rasterize(cache_state, layer, ctx, canvas);
});
}
}
return false;
}
bool LayerRasterCacheItem::Draw(const PaintContext& context,
const DlPaint* paint) const {
return Draw(context, context.canvas, paint);
}
bool LayerRasterCacheItem::Draw(const PaintContext& context,
DlCanvas* canvas,
const DlPaint* paint) const {
if (!context.raster_cache || !canvas) {
return false;
}
switch (cache_state_) {
case RasterCacheItem::kNone:
return false;
case RasterCacheItem::kCurrent: {
return context.raster_cache->Draw(key_id_, *canvas, paint,
context.rendering_above_platform_view);
}
case RasterCacheItem::kChildren: {
if (!layer_children_id_.has_value()) {
return false;
}
return context.raster_cache->Draw(layer_children_id_.value(), *canvas,
paint,
context.rendering_above_platform_view);
}
}
}
} // namespace flutter