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MultiSourceHelper.java -> MultiSourceHelper.kt (facebook#43776)
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Summary:
Pull Request resolved: facebook#43776

## Changelog:
[Internal] -

As in the title.

Differential Revision: D55640126
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rshest authored and facebook-github-bot committed Apr 3, 2024
1 parent 3ef1fac commit ed1dd65
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Showing 4 changed files with 98 additions and 114 deletions.
14 changes: 7 additions & 7 deletions packages/react-native/ReactAndroid/api/ReactAndroid.api
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Expand Up @@ -6126,15 +6126,15 @@ public class com/facebook/react/views/imagehelper/ImageSource {
public fun isResource ()Z
}

public class com/facebook/react/views/imagehelper/MultiSourceHelper {
public fun <init> ()V
public static fun getBestSourceForSize (IILjava/util/List;)Lcom/facebook/react/views/imagehelper/MultiSourceHelper$MultiSourceResult;
public static fun getBestSourceForSize (IILjava/util/List;D)Lcom/facebook/react/views/imagehelper/MultiSourceHelper$MultiSourceResult;
public final class com/facebook/react/views/imagehelper/MultiSourceHelper {
public static final field INSTANCE Lcom/facebook/react/views/imagehelper/MultiSourceHelper;
public static final fun getBestSourceForSize (IILjava/util/List;)Lcom/facebook/react/views/imagehelper/MultiSourceHelper$MultiSourceResult;
}

public class com/facebook/react/views/imagehelper/MultiSourceHelper$MultiSourceResult {
public fun getBestResult ()Lcom/facebook/react/views/imagehelper/ImageSource;
public fun getBestResultInCache ()Lcom/facebook/react/views/imagehelper/ImageSource;
public final class com/facebook/react/views/imagehelper/MultiSourceHelper$MultiSourceResult {
public final field bestResult Lcom/facebook/react/views/imagehelper/ImageSource;
public final field bestResultInCache Lcom/facebook/react/views/imagehelper/ImageSource;
public fun <init> (Lcom/facebook/react/views/imagehelper/ImageSource;Lcom/facebook/react/views/imagehelper/ImageSource;)V
}

public final class com/facebook/react/views/imagehelper/ResourceDrawableIdHelper {
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Expand Up @@ -578,8 +578,8 @@ private void setSourceImage() {
} else if (hasMultipleSources()) {
MultiSourceResult multiSource =
MultiSourceHelper.getBestSourceForSize(getWidth(), getHeight(), mSources);
mImageSource = multiSource.getBestResult();
mCachedImageSource = multiSource.getBestResultInCache();
mImageSource = multiSource.bestResult;
mCachedImageSource = multiSource.bestResultInCache;
return;
}

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This file was deleted.

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@@ -0,0 +1,89 @@
/*
* 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.
*/

package com.facebook.react.views.imagehelper

import com.facebook.imagepipeline.core.ImagePipelineFactory

/** 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)

/**
* 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)
}

// single source
if (sources.size == 1) {
return MultiSourceResult(sources[0], null)
}

// 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)
}

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.
*/
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.
*/
public val bestResultInCache: ImageSource?
)
}

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