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MultiSourceHelper.java -> MultiSourceHelper.kt (facebook#43776)
Summary: Pull Request resolved: facebook#43776 ## Changelog: [Internal] - As in the title. Reviewed By: alanleedev Differential Revision: D55640126
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| package com.facebook.react.views.imagehelper | ||
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| import com.facebook.imagepipeline.core.ImagePipelineFactory | ||
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| /** Helper class for dealing with multisource images. */ | ||
| public object MultiSourceHelper { | ||
| @JvmStatic | ||
| public fun getBestSourceForSize( | ||
| width: Int, | ||
| height: Int, | ||
| sources: List<ImageSource> | ||
| ): MultiSourceResult = getBestSourceForSize(width, height, sources, 1.0) | ||
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| /** | ||
| * Chooses the image source with the size closest to the target image size. | ||
| * | ||
| * @param width the width of the view that will be used to display this image | ||
| * @param height the height of the view that will be used to display this image | ||
| * @param sources the list of potential image sources to choose from | ||
| * @param multiplier the area of the view will be multiplied by this number before calculating the | ||
| * best source; this is useful if the image will be displayed bigger than the view (e.g. zoomed) | ||
| */ | ||
| @JvmStatic | ||
| public fun getBestSourceForSize( | ||
| width: Int, | ||
| height: Int, | ||
| sources: List<ImageSource>, | ||
| multiplier: Double | ||
| ): MultiSourceResult { | ||
| // no sources | ||
| if (sources.isEmpty()) { | ||
| return MultiSourceResult(null, null) | ||
| } | ||
|
|
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| // single source | ||
| if (sources.size == 1) { | ||
| return MultiSourceResult(sources[0], null) | ||
| } | ||
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| // For multiple sources, we first need the view's size in order to determine the best source to | ||
| // load. If we haven't been measured yet, return null and wait for onSizeChanged. | ||
| if (width <= 0 || height <= 0) { | ||
| return MultiSourceResult(null, null) | ||
| } | ||
| val imagePipeline = ImagePipelineFactory.getInstance().imagePipeline | ||
| var best: ImageSource? = null | ||
| var bestCached: ImageSource? = null | ||
| val viewArea = width * height * multiplier | ||
| var bestPrecision = Double.MAX_VALUE | ||
| var bestCachePrecision = Double.MAX_VALUE | ||
| for (source in sources) { | ||
| val precision = Math.abs(1.0 - source.size / viewArea) | ||
| if (precision < bestPrecision) { | ||
| bestPrecision = precision | ||
| best = source | ||
| } | ||
| if (precision < bestCachePrecision && | ||
| (imagePipeline.isInBitmapMemoryCache(source.uri) || | ||
| imagePipeline.isInDiskCacheSync(source.uri))) { | ||
| bestCachePrecision = precision | ||
| bestCached = source | ||
| } | ||
| } | ||
| if (bestCached != null && best != null && bestCached.source == best.source) { | ||
| bestCached = null | ||
| } | ||
| return MultiSourceResult(best, bestCached) | ||
| } | ||
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| public class MultiSourceResult( | ||
| /** | ||
| * Get the best result overall (closest in size to the view's size). Can be null if there were | ||
| * no sources to choose from, or if there were more than 1 sources but width/height were 0. | ||
| */ | ||
| @JvmField public val bestResult: ImageSource?, | ||
| /** | ||
| * Get the best result (closest in size to the view's size) that is also in cache. If this | ||
| * would be the same as the source from [.getBestResult], this will return `null` instead. | ||
| */ | ||
| @JvmField public val bestResultInCache: ImageSource? | ||
| ) | ||
| } |