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e79d77f6e6
See https://github.com/flutter/flutter/pull/22566#discussion_r226082171 for why we add this.
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
// Copyright 2015 The Chromium 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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namespace flow {
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OpacityLayer::OpacityLayer() = default;
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OpacityLayer::~OpacityLayer() = default;
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void OpacityLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
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SkMatrix child_matrix = matrix;
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child_matrix.postTranslate(offset_.fX, offset_.fY);
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ContainerLayer::Preroll(context, child_matrix);
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if (context->raster_cache && layers().size() == 1) {
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Layer* child = layers()[0].get();
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SkMatrix ctm = child_matrix;
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#ifndef SUPPORT_FRACTIONAL_TRANSLATION
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ctm = RasterCache::GetIntegralTransCTM(ctm);
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#endif
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context->raster_cache->Prepare(context, child, ctm);
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}
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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());
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SkPaint paint;
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paint.setAlpha(alpha_);
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SkAutoCanvasRestore save(&context.canvas, true);
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context.canvas.translate(offset_.fX, offset_.fY);
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#ifndef SUPPORT_FRACTIONAL_TRANSLATION
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context.canvas.setMatrix(
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RasterCache::GetIntegralTransCTM(context.canvas.getTotalMatrix()));
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#endif
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if (layers().size() == 1 && context.raster_cache) {
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const SkMatrix& ctm = context.canvas.getTotalMatrix();
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RasterCacheResult child_cache =
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context.raster_cache->Get(layers()[0].get(), ctm);
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if (child_cache.is_valid()) {
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child_cache.draw(context.canvas, &paint);
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return;
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}
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}
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Layer::AutoSaveLayer save_layer =
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Layer::AutoSaveLayer::Create(context, paint_bounds(), &paint);
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PaintChildren(context);
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}
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} // namespace flow
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