| // 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/color_filter_layer.h" |
| |
| #include "flutter/display_list/display_list_comparable.h" |
| #include "flutter/display_list/display_list_paint.h" |
| #include "flutter/flow/raster_cache_item.h" |
| #include "flutter/flow/raster_cache_util.h" |
| |
| namespace flutter { |
| |
| ColorFilterLayer::ColorFilterLayer(std::shared_ptr<const DlColorFilter> filter) |
| : CacheableContainerLayer( |
| RasterCacheUtil::kMinimumRendersBeforeCachingFilterLayer, |
| true), |
| filter_(std::move(filter)) {} |
| |
| void ColorFilterLayer::Diff(DiffContext* context, const Layer* old_layer) { |
| DiffContext::AutoSubtreeRestore subtree(context); |
| auto* prev = static_cast<const ColorFilterLayer*>(old_layer); |
| if (!context->IsSubtreeDirty()) { |
| FML_DCHECK(prev); |
| if (NotEquals(filter_, prev->filter_)) { |
| context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer)); |
| } |
| } |
| |
| if (context->has_raster_cache()) { |
| context->SetTransform( |
| RasterCacheUtil::GetIntegralTransCTM(context->GetTransform())); |
| } |
| |
| DiffChildren(context, prev); |
| |
| context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion()); |
| } |
| |
| void ColorFilterLayer::Preroll(PrerollContext* context) { |
| Layer::AutoPrerollSaveLayerState save = |
| Layer::AutoPrerollSaveLayerState::Create(context); |
| AutoCache cache = AutoCache(layer_raster_cache_item_.get(), context, |
| context->state_stack.transform_3x3()); |
| |
| ContainerLayer::Preroll(context); |
| |
| // Our saveLayer would apply any outstanding opacity or any outstanding |
| // image filter before it applies our color filter, but that is in the |
| // wrong order compared to how these attributes were applied to the tree |
| // (they would have come from one of our ancestors). So we cannot apply |
| // those attributes with our saveLayer normally. |
| // However, some color filters can commute themselves with an opacity |
| // modulation so in that case we can apply the opacity on behalf of our |
| // ancestors - otherwise we can apply no attributes. |
| if (filter_) { |
| context->renderable_state_flags = |
| filter_->can_commute_with_opacity() |
| ? LayerStateStack::kCallerCanApplyOpacity |
| : 0; |
| } |
| // else - we can apply whatever our children can apply. |
| } |
| |
| void ColorFilterLayer::Paint(PaintContext& context) const { |
| FML_DCHECK(needs_painting(context)); |
| |
| auto mutator = context.state_stack.save(); |
| |
| if (context.raster_cache) { |
| // Always apply the integral transform in the presence of a raster cache |
| // whether or not we will draw from the cache |
| mutator.integralTransform(); |
| |
| // Try drawing the layer cache item from the cache before applying the |
| // color filter if it was cached with the filter applied. |
| if (!layer_raster_cache_item_->IsCacheChildren()) { |
| SkPaint sk_paint; |
| if (layer_raster_cache_item_->Draw(context, |
| context.state_stack.fill(sk_paint))) { |
| return; |
| } |
| } |
| } |
| |
| // Now apply the color filter and then try rendering children either from |
| // cache or directly. |
| mutator.applyColorFilter(paint_bounds(), filter_); |
| |
| if (context.raster_cache && layer_raster_cache_item_->IsCacheChildren()) { |
| SkPaint sk_paint; |
| if (layer_raster_cache_item_->Draw(context, |
| context.state_stack.fill(sk_paint))) { |
| return; |
| } |
| } |
| |
| PaintChildren(context); |
| } |
| |
| } // namespace flutter |