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Change Java to use array indexes instead of methods

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Method invocations are not entirely free on Android. Change the
generated Java code to use the same array-based approach used in
JS and C to compute dimensions, positions, etc instead of relying
too heavily on method invovations. As a bonus, the Java transpiler
becomes a lot simpler because the code is more analogous to the C
counterpart.

In my local benchmarks this change gives us a major performance
boost on Android (between 15% and 30%) depending on the device
and the runtime (Dalvik|Art).
This commit is contained in:
Lucas Rocha
2015-09-04 13:50:28 +01:00
parent 00c8428015
commit 06c708053f
8 changed files with 2752 additions and 2921 deletions
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8
src/Layout.js
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@@ -391,9 +391,9 @@ var computeLayout = (function() {
function layoutNode(node, parentMaxWidth, /*css_direction_t*/parentDirection) {
var/*css_direction_t*/ direction = resolveDirection(node, parentDirection);
var/*css_flex_direction_t*/ mainAxis = resolveAxis(getFlexDirection(node), direction);
var/*css_flex_direction_t*/ crossAxis = getCrossFlexDirection(mainAxis, direction);
var/*css_flex_direction_t*/ resolvedRowAxis = resolveAxis(CSS_FLEX_DIRECTION_ROW, direction);
var/*(c)!css_flex_direction_t*//*(java)!int*/ mainAxis = resolveAxis(getFlexDirection(node), direction);
var/*(c)!css_flex_direction_t*//*(java)!int*/ crossAxis = getCrossFlexDirection(mainAxis, direction);
var/*(c)!css_flex_direction_t*//*(java)!int*/ resolvedRowAxis = resolveAxis(CSS_FLEX_DIRECTION_ROW, direction);
// Handle width and height style attributes
setDimensionFromStyle(node, mainAxis);
@@ -457,7 +457,7 @@ var computeLayout = (function() {
var/*int*/ i;
var/*int*/ ii;
var/*css_node_t**/ child;
var/*css_flex_direction_t*/ axis;
var/*(c)!css_flex_direction_t*//*(java)!int*/ axis;
// Pre-fill some dimensions straight from the parent
for (i = 0; i < node.children.length; ++i) {