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YogaNodeProperties implementation based on ByteBuffer
Summary: @public Adds an implementation of `YogaNodeProperties` that accesses style and layout properties using a `ByteBuffer` rather than JNI calls. We hope for a speed improvement. This needs further cleanup after experimenting, e.g. to codegen the offsets. Reviewed By: pasqualeanatriello Differential Revision: D8911723 fbshipit-source-id: 3c24b57eb545155878896ebb5d64d4553eb6bedc
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ReactAndroid/src/main/java/com/facebook/yoga/YogaNodeMemoryLayout.java
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| /* | ||
| * Copyright (c) 2014-present, Facebook, Inc. | ||
| * | ||
| * This source code is licensed under the MIT license found in the LICENSE | ||
| * file in the root directory of this source tree. | ||
| * | ||
| */ | ||
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| package com.facebook.yoga; | ||
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| import com.facebook.proguard.annotations.DoNotStrip; | ||
| import java.nio.ByteBuffer; | ||
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| @DoNotStrip | ||
| /* package */ final class YogaNodeMemoryLayout { | ||
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| private static final int FLOAT_SIZE = 4; | ||
| private static final int INT_SIZE = 4; | ||
| private static final int VALUE_SIZE = FLOAT_SIZE + INT_SIZE; | ||
| private static final byte FALSE = 0; | ||
| private static final byte TRUE = 1; | ||
| private static final int AUTO = YogaUnit.AUTO.intValue(); | ||
| private static final int POINT = YogaUnit.POINT.intValue(); | ||
| private static final int PERCENT = YogaUnit.PERCENT.intValue(); | ||
| private static final int UNDEFINED = YogaUnit.UNDEFINED.intValue(); | ||
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| // TODO(davidaurelio) code-gen these values | ||
| static final int styleDirection = 0; | ||
| static final int styleFlexDirection = 4; | ||
| static final int styleJustifyContent = 8; | ||
| static final int styleAlignContent = 12; | ||
| static final int styleAlignItems = 16; | ||
| static final int styleAlignSelf = 20; | ||
| static final int stylePositionType = 24; | ||
| static final int styleFlexWrap = 28; | ||
| static final int styleOverflow = 32; | ||
| static final int styleDisplay = 36; | ||
| static final int styleFlex = 40; | ||
| static final int styleFlexGrow = 48; | ||
| static final int styleFlexShrink = 56; | ||
| static final int styleFlexBasis = 64; | ||
| static final int styleMargin = 72; | ||
| static final int stylePosition = 144; | ||
| static final int stylePadding = 216; | ||
| static final int styleBorder = 288; | ||
| static final int styleDimensions = 360; | ||
| static final int styleMinDimensions = 376; | ||
| static final int styleMaxDimensions = 392; | ||
| static final int styleAspectRatio = 408; | ||
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| static final int styleWidth = styleDimensions; | ||
| static final int styleHeight = styleDimensions + VALUE_SIZE; | ||
| static final int styleMinWidth = styleMinDimensions; | ||
| static final int styleMinHeight = styleMinDimensions + VALUE_SIZE; | ||
| static final int styleMaxWidth = styleMaxDimensions; | ||
| static final int styleMaxHeight = styleMaxDimensions + VALUE_SIZE; | ||
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| static final int layoutPosition = 0; | ||
| static final int layoutDimensions = 16; | ||
| static final int layoutMargin = 24; | ||
| static final int layoutBorder = 48; | ||
| static final int layoutPadding = 72; | ||
| static final int layoutDirection = 96; | ||
| static final int layoutComputedFlexBasisGeneration = 100; | ||
| static final int layoutComputedFlexBasis = 104; | ||
| static final int layoutHadOverflow = 112; | ||
| static final int layoutGenerationCount = 116; | ||
| static final int layoutLastOwnerDirection = 120; | ||
| static final int layoutNextCachedMeasurementsIndex = 124; | ||
| static final int layoutCachedMeasurements = 128; | ||
| static final int layoutMeasuredDimensions = 512; | ||
| static final int layoutCachedLayout = 520; | ||
| static final int layoutDidUseLegacyFlag = 544; | ||
| static final int layoutDoesLegacyStretchFlagAffectsLayout = 545; | ||
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| static final int layoutX = layoutPosition; | ||
| static final int layoutY = layoutPosition + FLOAT_SIZE; | ||
| static final int layoutWidth = layoutDimensions; | ||
| static final int layoutHeight = layoutDimensions + FLOAT_SIZE; | ||
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| static int stylePositionOffset(YogaEdge edge) { | ||
| return stylePosition + edge.intValue() * VALUE_SIZE; | ||
| } | ||
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| static int styleMarginOffset(YogaEdge edge) { | ||
| return styleMargin + edge.intValue() * VALUE_SIZE; | ||
| } | ||
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| static int layoutMarginOffset(YogaEdge edge) { | ||
| return layoutMargin + edge.intValue() * FLOAT_SIZE; | ||
| } | ||
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| static int stylePaddingOffset(YogaEdge edge) { | ||
| return stylePadding + edge.intValue() * VALUE_SIZE; | ||
| } | ||
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| static int layoutPaddingOffset(YogaEdge edge) { | ||
| return layoutPadding + edge.intValue() * FLOAT_SIZE; | ||
| } | ||
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| static int styleBorderOffset(YogaEdge edge) { | ||
| return styleBorder + edge.intValue() * VALUE_SIZE; | ||
| } | ||
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| static int layoutBorderOffset(YogaEdge edge) { | ||
| return layoutBorder + edge.intValue() * FLOAT_SIZE; | ||
| } | ||
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| static void putOptional(ByteBuffer buffer, int offset, float value) { | ||
| buffer.putFloat(offset, value); | ||
| buffer.put( | ||
| offset + FLOAT_SIZE, YogaConstants.isUndefined(value) ? TRUE : FALSE); // bool isUndefined_ | ||
| } | ||
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| static float getOptional(ByteBuffer buffer, int offset) { | ||
| return getBoolean(buffer, offset + FLOAT_SIZE) | ||
| ? YogaConstants.UNDEFINED | ||
| : buffer.getFloat(offset); | ||
| } | ||
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| private static void putValue(ByteBuffer buffer, int offset, float value, int unit) { | ||
| if (YogaConstants.isUndefined(value)) { | ||
| value = YogaConstants.UNDEFINED; | ||
| unit = UNDEFINED; | ||
| } | ||
| buffer.putFloat(offset, value); | ||
| buffer.putInt(offset + FLOAT_SIZE, unit); | ||
| } | ||
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| static void putAutoValue(ByteBuffer buffer, int offset) { | ||
| putValue(buffer, offset, 0, AUTO); | ||
| } | ||
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| static void putPointValue(ByteBuffer buffer, int offset, float value) { | ||
| putValue(buffer, offset, value, POINT); | ||
| } | ||
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| static void putPercentValue(ByteBuffer buffer, int offset, float value) { | ||
| putValue(buffer, offset, value, PERCENT); | ||
| } | ||
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| static YogaValue getValue(ByteBuffer buffer, int offset) { | ||
| float value = buffer.getFloat(offset); | ||
| int unit = buffer.getInt(offset + FLOAT_SIZE); | ||
| return new YogaValue(value, YogaUnit.fromInt(unit)); | ||
| } | ||
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| static boolean getBoolean(ByteBuffer buffer, int offset) { | ||
| return buffer.get(offset) != 0; | ||
| } | ||
| } |
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