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Support Image resizeMode=repeat on Android
Summary: `<Image resizeMode="repeat" />` for Android, matching the iOS implementation (facebook#7968). (Non-goal: changing the component's API for finer-grained control / feature parity with CSS - this would be nice in the future) As requested in e.g. facebook#14158. Given facebook/fresco#1575, and lacking the context to follow the specific recommendations in facebook/fresco#1575 (comment), I've opted for a minimal change within RN itself. It's likely that performance can be improved by offloading this work to Fresco in some clever way; but I'm assuming that the present naive approach is still an improvement over a userland implementation with `onLayout` and multiple `<Image>` instances. - Picking up on a TODO note in the existing code, I implemented `MultiPostprocessor` to allow arbitrary chaining of Fresco-compatible postprocessors inside `ReactImageView`. - Rather than extensively refactor `ImageResizeMode`, `ReactImageManager` and `ReactImageView`, I mostly preserved the existing API that maps `resizeMode` values to [`ScaleType`](http://frescolib.org/javadoc/reference/com/facebook/drawee/drawable/ScalingUtils.ScaleType.html) instances, and simply added a second mapping, to [`TileMode`](https://developer.android.com/reference/android/graphics/Shader.TileMode.html). - To match the iOS rendering exactly for oversized images, I found that scaling with a custom `ScaleType` was required - a kind of combination of `CENTER_INSIDE` and `FIT_START` which Fresco doesn't provide - so I implemented that as `ScaleTypeStartInside`. (This is, frankly, questionable as the default behaviour on iOS to begin with - but I am aiming for parity here) - `resizeMode="repeat"` is therefore unpacked by the view manager to the effect of: ```js view.setScaleType(ScaleTypeStartInside.INSTANCE); view.setTileMode(Shader.TileMode.REPEAT); ``` And the added postprocessing in the view (in case of a non-`CLAMP` tile mode) consists of waiting for layout, allocating a destination bitmap and painting the source bitmap with the requested tile mode and scale type. Note that as in facebook#17398 (comment), I have neither updated nor tested the "Flat" UI implementation - everything compiles but I've taken [this comment](facebook#12770 (comment)) to mean there's no point in trying to wade through it on my own right now; I'm happy to tackle it if given some pointers. Also, I'm happy to address any code style issues or other feedback; I'm new to this codebase and a very infrequent Android/Java coder. Tested by enabling the relevant case in RNTester on Android. | iOS | Android | |-|-| | <img src=https://user-images.githubusercontent.com/2246565/34461897-4e12008e-ee2f-11e7-8581-1dc0cc8f2779.png width=300>| <img src=https://user-images.githubusercontent.com/2246565/34461894-40b2c8ec-ee2f-11e7-8a8f-96704f3c8caa.png width=300> | Docs update: facebook/react-native-website#106 [ANDROID] [FEATURE] [Image] - Implement resizeMode=repeat Closes facebook#17404 Reviewed By: achen1 Differential Revision: D7070329 Pulled By: mdvacca fbshipit-source-id: 6a72fcbdcc7c7c2daf293dc1d8b6728f54ad0249 (cherry picked from commit 0459e4f)
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79 changes: 79 additions & 0 deletions
79
ReactAndroid/src/main/java/com/facebook/react/views/image/MultiPostprocessor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| /** | ||
| * Copyright (c) 2017-present, Facebook, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * This source code is licensed under the BSD-style license found in the | ||
| * LICENSE file in the root directory of this source tree. An additional grant | ||
| * of patent rights can be found in the PATENTS file in the same directory. | ||
| */ | ||
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| package com.facebook.react.views.image; | ||
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| import android.graphics.Bitmap; | ||
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| import com.facebook.cache.common.CacheKey; | ||
| import com.facebook.cache.common.MultiCacheKey; | ||
| import com.facebook.common.references.CloseableReference; | ||
| import com.facebook.imagepipeline.bitmaps.PlatformBitmapFactory; | ||
| import com.facebook.imagepipeline.request.Postprocessor; | ||
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| import java.util.LinkedList; | ||
| import java.util.List; | ||
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| public class MultiPostprocessor implements Postprocessor { | ||
| private final List<Postprocessor> mPostprocessors; | ||
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| public static Postprocessor from(List<Postprocessor> postprocessors) { | ||
| switch (postprocessors.size()) { | ||
| case 0: | ||
| return null; | ||
| case 1: | ||
| return postprocessors.get(0); | ||
| default: | ||
| return new MultiPostprocessor(postprocessors); | ||
| } | ||
| } | ||
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| private MultiPostprocessor(List<Postprocessor> postprocessors) { | ||
| mPostprocessors = new LinkedList<>(postprocessors); | ||
| } | ||
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| @Override | ||
| public String getName () { | ||
| StringBuilder name = new StringBuilder(); | ||
| for (Postprocessor p: mPostprocessors) { | ||
| if (name.length() > 0) { | ||
| name.append(","); | ||
| } | ||
| name.append(p.getName()); | ||
| } | ||
| name.insert(0, "MultiPostProcessor ("); | ||
| name.append(")"); | ||
| return name.toString(); | ||
| } | ||
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| @Override | ||
| public CacheKey getPostprocessorCacheKey () { | ||
| LinkedList<CacheKey> keys = new LinkedList<>(); | ||
| for (Postprocessor p: mPostprocessors) { | ||
| keys.push(p.getPostprocessorCacheKey()); | ||
| } | ||
| return new MultiCacheKey(keys); | ||
| } | ||
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| @Override | ||
| public CloseableReference<Bitmap> process(Bitmap sourceBitmap, PlatformBitmapFactory bitmapFactory) { | ||
| CloseableReference<Bitmap> prevBitmap = null, nextBitmap = null; | ||
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| try { | ||
| for (Postprocessor p : mPostprocessors) { | ||
| nextBitmap = p.process(prevBitmap != null ? prevBitmap.get() : sourceBitmap, bitmapFactory); | ||
| CloseableReference.closeSafely(prevBitmap); | ||
| prevBitmap = nextBitmap.clone(); | ||
| } | ||
| return nextBitmap.clone(); | ||
| } finally { | ||
| CloseableReference.closeSafely(nextBitmap); | ||
| } | ||
| } | ||
| } |
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40 changes: 40 additions & 0 deletions
40
ReactAndroid/src/main/java/com/facebook/react/views/image/ScaleTypeStartInside.java
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| @@ -0,0 +1,40 @@ | ||
| /** | ||
| * Copyright (c) 2017-present, Facebook, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * This source code is licensed under the BSD-style license found in the | ||
| * LICENSE file in the root directory of this source tree. An additional grant | ||
| * of patent rights can be found in the PATENTS file in the same directory. | ||
| */ | ||
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| package com.facebook.react.views.image; | ||
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| import android.graphics.Matrix; | ||
| import android.graphics.Rect; | ||
| import com.facebook.drawee.drawable.ScalingUtils; | ||
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| public class ScaleTypeStartInside extends ScalingUtils.AbstractScaleType { | ||
| public static final ScalingUtils.ScaleType INSTANCE = new ScaleTypeStartInside(); | ||
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| @Override | ||
| public void getTransformImpl( | ||
| Matrix outTransform, | ||
| Rect parentRect, | ||
| int childWidth, | ||
| int childHeight, | ||
| float focusX, | ||
| float focusY, | ||
| float scaleX, | ||
| float scaleY) { | ||
| float scale = Math.min(Math.min(scaleX, scaleY), 1.0f); | ||
| float dx = parentRect.left; | ||
| float dy = parentRect.top; | ||
| outTransform.setScale(scale, scale); | ||
| outTransform.postTranslate((int) (dx + 0.5f), (int) (dy + 0.5f)); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return "start_inside"; | ||
| } | ||
| } |