Update Image resizeMode=repeat docs #106
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motiz88
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Dec 31, 2017
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motiz88
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- Android implementation pending review: Support Image resizeMode=repeat on Android react-native#17404
- Current behaviour on iOS (as well as on Android per Support Image resizeMode=repeat on Android react-native#17404) differs from what's documented for an image that's larger than the view.
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We'll wait for facebook/react-native#17404 to be reviewed and merged before. |
motiz88
changed the title
|
I've corrected the documentation in light of the actually-implemented scaling behaviour (see item 2 in my edited comment above). This could in principle be broken out into its own PR as it needn't be blocked on facebook/react-native#17404. Should I go ahead and do that? |
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Mar 12, 2018
Summary: `<Image resizeMode="repeat" />` for Android, matching the iOS implementation (#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. #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 #17398 (comment), I have neither updated nor tested the "Flat" UI implementation - everything compiles but I've taken [this comment](#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 #17404 Reviewed By: achen1 Differential Revision: D7070329 Pulled By: mdvacca fbshipit-source-id: 6a72fcbdcc7c7c2daf293dc1d8b6728f54ad0249
hamaron
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Apr 9, 2018
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
charpeni
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campsafari
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Apr 11, 2018
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
LukeDurrant
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Apr 11, 2018
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
LukeDurrant
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Apr 11, 2018
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
bunnyc1986
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May 11, 2018
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
buoyad
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Jun 5, 2018
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)
lnikkila
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Jun 6, 2018
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
macdoum1
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Jun 28, 2018
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
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Aug 17, 2018
Summary: `<Image resizeMode="repeat" />` for Android, matching the iOS implementation (#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. #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/react-native#17398 (comment), I have neither updated nor tested the "Flat" UI implementation - everything compiles but I've taken [this comment](facebook/react-native#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/react-native#17404 Reviewed By: achen1 Differential Revision: D7070329 Pulled By: mdvacca fbshipit-source-id: 6a72fcbdcc7c7c2daf293dc1d8b6728f54ad0249
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