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Consolidate measure cache for layout nodes and leaf nodes 

Reviewed By: astreet

Differential Revision: D4957570

fbshipit-source-id: 5c5f39b67bd3f72d92b939ecee2d9a46c80b583f
This commit is contained in:
Emil Sjolander 2017-04-27 13:02:55 -07:00 коммит произвёл Facebook Github Bot
Родитель 39f9e7a6b1
Коммит 6272ef87bc
1 изменённых файлов: 35 добавлений и 61 удалений
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96
ReactCommon/yoga/yoga/Yoga.c
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@ -3116,71 +3116,45 @@ bool YGLayoutNodeInternal(const YGNodeRef node,
layout->cachedLayout.computedHeight = -1;
}
YGCachedMeasurement *cachedResults = NULL;
// Determine whether the results are already cached. We maintain a separate
// cache for layouts and measurements. A layout operation modifies the
// positions
// and dimensions for nodes in the subtree. The algorithm assumes that each
// node
// gets layed out a maximum of one time per tree layout, but multiple
// measurements
// may be required to resolve all of the flex dimensions.
// We handle nodes with measure functions specially here because they are the
// most
// expensive to measure, so it's worth avoiding redundant measurements if at
// all possible.
if (node->measure) {
const float marginAxisRow = YGNodeMarginForAxis(node, YGFlexDirectionRow, parentWidth);
const float marginAxisColumn = YGNodeMarginForAxis(node, YGFlexDirectionColumn, parentWidth);
// positions and dimensions for nodes in the subtree. The algorithm assumes that each
// node gets layed out a maximum of one time per tree layout, but multiple
// measurements may be required to resolve all of the flex dimensions.
// First, try to use the layout cache.
if (YGNodeCanUseCachedMeasurement(widthMeasureMode,
availableWidth,
heightMeasureMode,
availableHeight,
layout->cachedLayout.widthMeasureMode,
layout->cachedLayout.availableWidth,
layout->cachedLayout.heightMeasureMode,
layout->cachedLayout.availableHeight,
layout->cachedLayout.computedWidth,
layout->cachedLayout.computedHeight,
marginAxisRow,
marginAxisColumn)) {
cachedResults = &layout->cachedLayout;
} else {
// Try to use the measurement cache.
for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
if (YGNodeCanUseCachedMeasurement(widthMeasureMode,
availableWidth,
heightMeasureMode,
availableHeight,
layout->cachedMeasurements[i].widthMeasureMode,
layout->cachedMeasurements[i].availableWidth,
layout->cachedMeasurements[i].heightMeasureMode,
layout->cachedMeasurements[i].availableHeight,
layout->cachedMeasurements[i].computedWidth,
layout->cachedMeasurements[i].computedHeight,
marginAxisRow,
marginAxisColumn)) {
cachedResults = &layout->cachedMeasurements[i];
break;
}
}
}
} else if (performLayout) {
if (YGFloatsEqual(layout->cachedLayout.availableWidth, availableWidth) &&
YGFloatsEqual(layout->cachedLayout.availableHeight, availableHeight) &&
layout->cachedLayout.widthMeasureMode == widthMeasureMode &&
layout->cachedLayout.heightMeasureMode == heightMeasureMode) {
cachedResults = &layout->cachedLayout;
}
} else {
YGCachedMeasurement *cachedResults = NULL;
const float marginAxisRow = YGNodeMarginForAxis(node, YGFlexDirectionRow, parentWidth);
const float marginAxisColumn = YGNodeMarginForAxis(node, YGFlexDirectionColumn, parentWidth);
// First, try to use the layout cache.
if ((node->measure || performLayout) && YGNodeCanUseCachedMeasurement(widthMeasureMode,
availableWidth,
heightMeasureMode,
availableHeight,
layout->cachedLayout.widthMeasureMode,
layout->cachedLayout.availableWidth,
layout->cachedLayout.heightMeasureMode,
layout->cachedLayout.availableHeight,
layout->cachedLayout.computedWidth,
layout->cachedLayout.computedHeight,
marginAxisRow,
marginAxisColumn)) {
cachedResults = &layout->cachedLayout;
} else if (node->measure || !performLayout) {
// Try to use the measurement cache.
for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
if (YGFloatsEqual(layout->cachedMeasurements[i].availableWidth, availableWidth) &&
YGFloatsEqual(layout->cachedMeasurements[i].availableHeight, availableHeight) &&
layout->cachedMeasurements[i].widthMeasureMode == widthMeasureMode &&
layout->cachedMeasurements[i].heightMeasureMode == heightMeasureMode) {
if (YGNodeCanUseCachedMeasurement(widthMeasureMode,
availableWidth,
heightMeasureMode,
availableHeight,
layout->cachedMeasurements[i].widthMeasureMode,
layout->cachedMeasurements[i].availableWidth,
layout->cachedMeasurements[i].heightMeasureMode,
layout->cachedMeasurements[i].availableHeight,
layout->cachedMeasurements[i].computedWidth,
layout->cachedMeasurements[i].computedHeight,
marginAxisRow,
marginAxisColumn)) {
cachedResults = &layout->cachedMeasurements[i];
break;
}