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98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/flow/layers/opacity_layer.h"
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#include "flutter/fml/trace_event.h"
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#include "third_party/skia/include/core/SkPaint.h"
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namespace flutter {
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OpacityLayer::OpacityLayer(SkAlpha alpha, const SkPoint& offset)
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: alpha_(alpha), offset_(offset) {}
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void OpacityLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
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TRACE_EVENT0("flutter", "OpacityLayer::Preroll");
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FML_DCHECK(!GetChildContainer()->layers().empty()); // We can't be a leaf.
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SkMatrix child_matrix = matrix;
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child_matrix.preTranslate(offset_.fX, offset_.fY);
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// Similar to what's done in TransformLayer::Preroll, we have to apply the
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// reverse transformation to the cull rect to properly cull child layers.
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context->cull_rect = context->cull_rect.makeOffset(-offset_.fX, -offset_.fY);
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context->mutators_stack.PushTransform(
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SkMatrix::Translate(offset_.fX, offset_.fY));
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context->mutators_stack.PushOpacity(alpha_);
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Layer::AutoPrerollSaveLayerState save =
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Layer::AutoPrerollSaveLayerState::Create(context);
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ContainerLayer::Preroll(context, child_matrix);
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context->mutators_stack.Pop();
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context->mutators_stack.Pop();
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{
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set_paint_bounds(paint_bounds().makeOffset(offset_.fX, offset_.fY));
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#ifndef SUPPORT_FRACTIONAL_TRANSLATION
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child_matrix = RasterCache::GetIntegralTransCTM(child_matrix);
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#endif
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TryToPrepareRasterCache(context, GetCacheableChild(), child_matrix);
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}
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// Restore cull_rect
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context->cull_rect = context->cull_rect.makeOffset(offset_.fX, offset_.fY);
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}
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void OpacityLayer::Paint(PaintContext& context) const {
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TRACE_EVENT0("flutter", "OpacityLayer::Paint");
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FML_DCHECK(needs_painting(context));
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SkPaint paint;
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paint.setAlpha(alpha_);
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SkAutoCanvasRestore save(context.internal_nodes_canvas, true);
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context.internal_nodes_canvas->translate(offset_.fX, offset_.fY);
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#ifndef SUPPORT_FRACTIONAL_TRANSLATION
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context.internal_nodes_canvas->setMatrix(RasterCache::GetIntegralTransCTM(
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context.leaf_nodes_canvas->getTotalMatrix()));
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#endif
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if (context.raster_cache &&
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context.raster_cache->Draw(GetCacheableChild(),
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*context.leaf_nodes_canvas, &paint)) {
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return;
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}
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// Skia may clip the content with saveLayerBounds (although it's not a
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// guaranteed clip). So we have to provide a big enough saveLayerBounds. To do
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// so, we first remove the offset from paint bounds since it's already in the
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// matrix. Then we round out the bounds.
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//
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// Note that the following lines are only accessible when the raster cache is
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// not available (e.g., when we're using the software backend in golden
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// tests).
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SkRect saveLayerBounds;
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paint_bounds()
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.makeOffset(-offset_.fX, -offset_.fY)
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.roundOut(&saveLayerBounds);
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Layer::AutoSaveLayer save_layer =
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Layer::AutoSaveLayer::Create(context, saveLayerBounds, &paint);
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PaintChildren(context);
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}
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#if defined(LEGACY_FUCHSIA_EMBEDDER)
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void OpacityLayer::UpdateScene(std::shared_ptr<SceneUpdateContext> context) {
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float saved_alpha = context->alphaf();
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context->set_alphaf(context->alphaf() * (alpha_ / 255.f));
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ContainerLayer::UpdateScene(context);
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context->set_alphaf(saved_alpha);
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}
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#endif
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} // namespace flutter
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