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[ReactNative] decompose transform matrix

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This commit is contained in:
Bill Fisher
2015-05-12 15:40:32 -07:00
committed by Christopher Chedeau
parent 6a699302c8
commit 89e26e92b6
3 changed files with 565 additions and 12 deletions
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17
Libraries/StyleSheet/precomputeStyle.js
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@@ -12,6 +12,7 @@
'use strict';
var MatrixMath = require('MatrixMath');
var Platform = require('Platform');
var deepFreezeAndThrowOnMutationInDev = require('deepFreezeAndThrowOnMutationInDev');
var invariant = require('invariant');
@@ -36,8 +37,9 @@ function precomputeStyle(style: ?Object): ?Object {
* Generate a transform matrix based on the provided transforms, and use that
* within the style object instead.
*
* This allows us to provide an API that is similar to CSS and to have a
* universal, singular interface to native code.
* This allows us to provide an API that is similar to CSS, where transforms may
* be applied in an arbitrary order, and yet have a universal, singular
* interface to native code.
*/
function _precomputeTransforms(style: Object): Object {
var {transform} = style;
@@ -80,6 +82,17 @@ function _precomputeTransforms(style: Object): Object {
}
});
// Android does not support the direct application of a transform matrix to
// a view, so we need to decompose the result matrix into transforms that can
// get applied in the specific order of (1) translate (2) scale (3) rotate.
// Once we can directly apply a matrix, we can remove this decomposition.
if (Platform.OS === 'android') {
return {
...style,
transformMatrix: result,
decomposedMatrix: MatrixMath.decomposeMatrix(result),
};
}
return {
...style,
transformMatrix: result,