87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <cstdlib>
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#include <limits>
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#include <react/components/image/ImageShadowNode.h>
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#include <react/core/LayoutContext.h>
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#include "ImageState.h"
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namespace facebook {
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namespace react {
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const char ImageComponentName[] = "Image";
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void ImageShadowNode::setImageManager(const SharedImageManager &imageManager) {
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ensureUnsealed();
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imageManager_ = imageManager;
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}
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void ImageShadowNode::updateStateIfNeeded() {
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ensureUnsealed();
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auto const &imageSource = getImageSource();
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auto const ¤tState = getStateData();
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if (currentState.getImageSource() == imageSource) {
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return;
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}
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auto state = ImageState{
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imageSource, imageManager_->requestImage(imageSource, getSurfaceId())};
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setStateData(std::move(state));
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}
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ImageSource ImageShadowNode::getImageSource() const {
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auto sources = getConcreteProps().sources;
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if (sources.size() == 0) {
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return {
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/* .type = */ ImageSource::Type::Invalid,
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};
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}
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if (sources.size() == 1) {
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return sources[0];
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}
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auto layoutMetrics = getLayoutMetrics();
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auto size = layoutMetrics.getContentFrame().size;
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auto scale = layoutMetrics.pointScaleFactor;
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auto targetImageArea = size.width * size.height * scale * scale;
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auto bestFit = std::numeric_limits<Float>::infinity();
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auto bestSource = ImageSource{};
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for (const auto &source : sources) {
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auto sourceSize = source.size;
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auto sourceScale = source.scale == 0 ? scale : source.scale;
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auto sourceArea =
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sourceSize.width * sourceSize.height * sourceScale * sourceScale;
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auto fit = std::abs(1 - (sourceArea / targetImageArea));
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if (fit < bestFit) {
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bestFit = fit;
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bestSource = source;
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}
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}
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return bestSource;
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}
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#pragma mark - LayoutableShadowNode
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void ImageShadowNode::layout(LayoutContext layoutContext) {
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updateStateIfNeeded();
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ConcreteViewShadowNode::layout(layoutContext);
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}
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} // namespace react
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} // namespace facebook
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