libs/hwui/VectorDrawable.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2015 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "VectorDrawable.h"

 #include "PathParser.h"
 #include "SkColorFilter.h"
 #include "SkImageInfo.h"
 #include "SkShader.h"
 #include <utils/Log.h>
 #include "utils/Macros.h"
 #include "utils/VectorDrawableUtils.h"

 #include <math.h>
 #include <string.h>

 namespace android {
 namespace uirenderer {
 namespace VectorDrawable {

 const int Tree::MAX_CACHED_BITMAP_SIZE = 2048;

 void Path::draw(SkCanvas* outCanvas, const SkMatrix& groupStackedMatrix, float scaleX, float scaleY,
         bool useStagingData) {
     float matrixScale = getMatrixScale(groupStackedMatrix);
     if (matrixScale == 0) {
         // When either x or y is scaled to 0, we don't need to draw anything.
         return;
     }

     SkMatrix pathMatrix(groupStackedMatrix);
     pathMatrix.postScale(scaleX, scaleY);

     //TODO: try apply the path matrix to the canvas instead of creating a new path.
     SkPath renderPath;
     renderPath.reset();

     if (useStagingData) {
         SkPath tmpPath;
         getStagingPath(&tmpPath);
         renderPath.addPath(tmpPath, pathMatrix);
     } else {
         renderPath.addPath(getUpdatedPath(), pathMatrix);
     }

     float minScale = fmin(scaleX, scaleY);
     float strokeScale = minScale * matrixScale;
     drawPath(outCanvas, renderPath, strokeScale, pathMatrix, useStagingData);
 }

 void Path::dump() {
     ALOGD("Path: %s has %zu points", mName.c_str(), mProperties.getData().points.size());
 }

 float Path::getMatrixScale(const SkMatrix& groupStackedMatrix) {
     // Given unit vectors A = (0, 1) and B = (1, 0).
     // After matrix mapping, we got A' and B'. Let theta = the angel b/t A' and B'.
     // Therefore, the final scale we want is min(|A'| * sin(theta), |B'| * sin(theta)),
     // which is (|A'| * |B'| * sin(theta)) / max (|A'|, |B'|);
     // If  max (|A'|, |B'|) = 0, that means either x or y has a scale of 0.
     //
     // For non-skew case, which is most of the cases, matrix scale is computing exactly the
     // scale on x and y axis, and take the minimal of these two.
     // For skew case, an unit square will mapped to a parallelogram. And this function will
     // return the minimal height of the 2 bases.
     SkVector skVectors[2];
     skVectors[0].set(0, 1);
     skVectors[1].set(1, 0);
     groupStackedMatrix.mapVectors(skVectors, 2);
     float scaleX = hypotf(skVectors[0].fX, skVectors[0].fY);
     float scaleY = hypotf(skVectors[1].fX, skVectors[1].fY);
     float crossProduct = skVectors[0].cross(skVectors[1]);
     float maxScale = fmax(scaleX, scaleY);

     float matrixScale = 0;
     if (maxScale > 0) {
         matrixScale = fabs(crossProduct) / maxScale;
     }
     return matrixScale;
 }

 // Called from UI thread during the initial setup/theme change.
 Path::Path(const char* pathStr, size_t strLength) {
     PathParser::ParseResult result;
     Data data;
     PathParser::getPathDataFromString(&data, &result, pathStr, strLength);
     mStagingProperties.setData(data);
 }

 Path::Path(const Path& path) : Node(path) {
     mStagingProperties.syncProperties(path.mStagingProperties);
 }

 const SkPath& Path::getUpdatedPath() {
     if (mSkPathDirty) {
         mSkPath.reset();
         VectorDrawableUtils::verbsToPath(&mSkPath, mProperties.getData());
         mSkPathDirty = false;
     }
     return mSkPath;
 }

 void Path::getStagingPath(SkPath* outPath) {
     outPath->reset();
     VectorDrawableUtils::verbsToPath(outPath, mStagingProperties.getData());
 }

 void Path::syncProperties() {
     if (mStagingPropertiesDirty) {
         mProperties.syncProperties(mStagingProperties);
     } else {
         mStagingProperties.syncProperties(mProperties);
     }
     mStagingPropertiesDirty = false;
 }

 FullPath::FullPath(const FullPath& path) : Path(path) {
     mStagingProperties.syncProperties(path.mStagingProperties);
 }

 static void applyTrim(SkPath* outPath, const SkPath& inPath, float trimPathStart, float trimPathEnd,
         float trimPathOffset) {
     if (trimPathStart == 0.0f && trimPathEnd == 1.0f) {
         *outPath = inPath;
         return;
     }
     outPath->reset();
     if (trimPathStart == trimPathEnd) {
         // Trimmed path should be empty.
         return;
     }
     SkPathMeasure measure(inPath, false);
     float len = SkScalarToFloat(measure.getLength());
     float start = len * fmod((trimPathStart + trimPathOffset), 1.0f);
     float end = len * fmod((trimPathEnd + trimPathOffset), 1.0f);

     if (start > end) {
         measure.getSegment(start, len, outPath, true);
         if (end > 0) {
             measure.getSegment(0, end, outPath, true);
         }
     } else {
         measure.getSegment(start, end, outPath, true);
     }
 }

 const SkPath& FullPath::getUpdatedPath() {
     if (!mSkPathDirty && !mProperties.mTrimDirty) {
         return mTrimmedSkPath;
     }
     Path::getUpdatedPath();
     if (mProperties.getTrimPathStart() != 0.0f || mProperties.getTrimPathEnd() != 1.0f) {
         mProperties.mTrimDirty = false;
         applyTrim(&mTrimmedSkPath, mSkPath, mProperties.getTrimPathStart(),
                 mProperties.getTrimPathEnd(), mProperties.getTrimPathOffset());
         return mTrimmedSkPath;
     } else {
         return mSkPath;
     }
 }

 void FullPath::getStagingPath(SkPath* outPath) {
     Path::getStagingPath(outPath);
     SkPath inPath = *outPath;
     applyTrim(outPath, inPath, mStagingProperties.getTrimPathStart(),
             mStagingProperties.getTrimPathEnd(), mStagingProperties.getTrimPathOffset());
 }

 void FullPath::dump() {
     Path::dump();
     ALOGD("stroke width, color, alpha: %f, %d, %f, fill color, alpha: %d, %f",
             mProperties.getStrokeWidth(), mProperties.getStrokeColor(), mProperties.getStrokeAlpha(),
             mProperties.getFillColor(), mProperties.getFillAlpha());
 }


 inline SkColor applyAlpha(SkColor color, float alpha) {
     int alphaBytes = SkColorGetA(color);
     return SkColorSetA(color, alphaBytes * alpha);
 }

 void FullPath::drawPath(SkCanvas* outCanvas, SkPath& renderPath, float strokeScale,
                         const SkMatrix& matrix, bool useStagingData){
     const FullPathProperties& properties = useStagingData ? mStagingProperties : mProperties;

     // Draw path's fill, if fill color or gradient is valid
     bool needsFill = false;
     SkPaint paint;
     if (properties.getFillGradient() != nullptr) {
         paint.setColor(applyAlpha(SK_ColorBLACK, properties.getFillAlpha()));
         SkShader* newShader = properties.getFillGradient()->newWithLocalMatrix(matrix);
         paint.setShader(newShader);
         needsFill = true;
     } else if (properties.getFillColor() != SK_ColorTRANSPARENT) {
         paint.setColor(applyAlpha(properties.getFillColor(), properties.getFillAlpha()));
         needsFill = true;
     }

     if (needsFill) {
         paint.setStyle(SkPaint::Style::kFill_Style);
         paint.setAntiAlias(true);
         SkPath::FillType ft = static_cast<SkPath::FillType>(properties.getFillType());
         renderPath.setFillType(ft);
         outCanvas->drawPath(renderPath, paint);
     }

     // Draw path's stroke, if stroke color or Gradient is valid
     bool needsStroke = false;
     if (properties.getStrokeGradient() != nullptr) {
         paint.setColor(applyAlpha(SK_ColorBLACK, properties.getStrokeAlpha()));
         SkShader* newShader = properties.getStrokeGradient()->newWithLocalMatrix(matrix);
         paint.setShader(newShader);
         needsStroke = true;
     } else if (properties.getStrokeColor() != SK_ColorTRANSPARENT) {
         paint.setColor(applyAlpha(properties.getStrokeColor(), properties.getStrokeAlpha()));
         needsStroke = true;
     }
     if (needsStroke) {
         paint.setStyle(SkPaint::Style::kStroke_Style);
         paint.setAntiAlias(true);
         paint.setStrokeJoin(SkPaint::Join(properties.getStrokeLineJoin()));
         paint.setStrokeCap(SkPaint::Cap(properties.getStrokeLineCap()));
         paint.setStrokeMiter(properties.getStrokeMiterLimit());
         paint.setStrokeWidth(properties.getStrokeWidth() * strokeScale);
         outCanvas->drawPath(renderPath, paint);
     }
 }

 void FullPath::syncProperties() {
     Path::syncProperties();

     if (mStagingPropertiesDirty) {
         mProperties.syncProperties(mStagingProperties);
     } else {
         // Update staging property with property values from animation.
         mStagingProperties.syncProperties(mProperties);
     }
     mStagingPropertiesDirty = false;
 }

 REQUIRE_COMPATIBLE_LAYOUT(FullPath::FullPathProperties::PrimitiveFields);

 static_assert(sizeof(float) == sizeof(int32_t), "float is not the same size as int32_t");
 static_assert(sizeof(SkColor) == sizeof(int32_t), "SkColor is not the same size as int32_t");

 bool FullPath::FullPathProperties::copyProperties(int8_t* outProperties, int length) const {
     int propertyDataSize = sizeof(FullPathProperties::PrimitiveFields);
     if (length != propertyDataSize) {
         LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
                 propertyDataSize, length);
         return false;
     }

     PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
     *out = mPrimitiveFields;
     return true;
 }

 void FullPath::FullPathProperties::setColorPropertyValue(int propertyId, int32_t value) {
     Property currentProperty = static_cast<Property>(propertyId);
     if (currentProperty == Property::strokeColor) {
         setStrokeColor(value);
     } else if (currentProperty == Property::fillColor) {
         setFillColor(value);
     } else {
         LOG_ALWAYS_FATAL("Error setting color property on FullPath: No valid property"
                 " with id: %d", propertyId);
     }
 }

 void FullPath::FullPathProperties::setPropertyValue(int propertyId, float value) {
     Property property = static_cast<Property>(propertyId);
     switch (property) {
     case Property::strokeWidth:
         setStrokeWidth(value);
         break;
     case Property::strokeAlpha:
         setStrokeAlpha(value);
         break;
     case Property::fillAlpha:
         setFillAlpha(value);
         break;
     case Property::trimPathStart:
         setTrimPathStart(value);
         break;
     case Property::trimPathEnd:
         setTrimPathEnd(value);
         break;
     case Property::trimPathOffset:
         setTrimPathOffset(value);
         break;
     default:
         LOG_ALWAYS_FATAL("Invalid property id: %d for animation", propertyId);
         break;
     }
 }

 void ClipPath::drawPath(SkCanvas* outCanvas, SkPath& renderPath,
         float strokeScale, const SkMatrix& matrix, bool useStagingData){
     outCanvas->clipPath(renderPath, SkRegion::kIntersect_Op);
 }

 Group::Group(const Group& group) : Node(group) {
     mStagingProperties.syncProperties(group.mStagingProperties);
 }

 void Group::draw(SkCanvas* outCanvas, const SkMatrix& currentMatrix, float scaleX,
         float scaleY, bool useStagingData) {
     // TODO: Try apply the matrix to the canvas instead of passing it down the tree

     // Calculate current group's matrix by preConcat the parent's and
     // and the current one on the top of the stack.
     // Basically the Mfinal = Mviewport * M0 * M1 * M2;
     // Mi the local matrix at level i of the group tree.
     SkMatrix stackedMatrix;
     const GroupProperties& prop = useStagingData ? mStagingProperties : mProperties;
     getLocalMatrix(&stackedMatrix, prop);
     stackedMatrix.postConcat(currentMatrix);

     // Save the current clip information, which is local to this group.
     outCanvas->save();
     // Draw the group tree in the same order as the XML file.
     for (auto& child : mChildren) {
         child->draw(outCanvas, stackedMatrix, scaleX, scaleY, useStagingData);
     }
     // Restore the previous clip information.
     outCanvas->restore();
 }

 void Group::dump() {
     ALOGD("Group %s has %zu children: ", mName.c_str(), mChildren.size());
     ALOGD("Group translateX, Y : %f, %f, scaleX, Y: %f, %f", mProperties.getTranslateX(),
             mProperties.getTranslateY(), mProperties.getScaleX(), mProperties.getScaleY());
     for (size_t i = 0; i < mChildren.size(); i++) {
         mChildren[i]->dump();
     }
 }

 void Group::syncProperties() {
     // Copy over the dirty staging properties
     if (mStagingPropertiesDirty) {
         mProperties.syncProperties(mStagingProperties);
     } else {
         mStagingProperties.syncProperties(mProperties);
     }
     mStagingPropertiesDirty = false;
     for (auto& child : mChildren) {
         child->syncProperties();
     }
 }

 void Group::getLocalMatrix(SkMatrix* outMatrix, const GroupProperties& properties) {
     outMatrix->reset();
     // TODO: use rotate(mRotate, mPivotX, mPivotY) and scale with pivot point, instead of
     // translating to pivot for rotating and scaling, then translating back.
     outMatrix->postTranslate(-properties.getPivotX(), -properties.getPivotY());
     outMatrix->postScale(properties.getScaleX(), properties.getScaleY());
     outMatrix->postRotate(properties.getRotation(), 0, 0);
     outMatrix->postTranslate(properties.getTranslateX() + properties.getPivotX(),
             properties.getTranslateY() + properties.getPivotY());
 }

 void Group::addChild(Node* child) {
     mChildren.emplace_back(child);
     if (mPropertyChangedListener != nullptr) {
         child->setPropertyChangedListener(mPropertyChangedListener);
     }
 }

 bool Group::GroupProperties::copyProperties(float* outProperties, int length) const {
     int propertyCount = static_cast<int>(Property::count);
     if (length != propertyCount) {
         LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
                 propertyCount, length);
         return false;
     }

     PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
     *out = mPrimitiveFields;
     return true;
 }

 // TODO: Consider animating the properties as float pointers
 // Called on render thread
 float Group::GroupProperties::getPropertyValue(int propertyId) const {
     Property currentProperty = static_cast<Property>(propertyId);
     switch (currentProperty) {
     case Property::rotate:
         return getRotation();
     case Property::pivotX:
         return getPivotX();
     case Property::pivotY:
         return getPivotY();
     case Property::scaleX:
         return getScaleX();
     case Property::scaleY:
         return getScaleY();
     case Property::translateX:
         return getTranslateX();
     case Property::translateY:
         return getTranslateY();
     default:
         LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
         return 0;
     }
 }

 // Called on render thread
 void Group::GroupProperties::setPropertyValue(int propertyId, float value) {
     Property currentProperty = static_cast<Property>(propertyId);
     switch (currentProperty) {
     case Property::rotate:
         setRotation(value);
         break;
     case Property::pivotX:
         setPivotX(value);
         break;
     case Property::pivotY:
         setPivotY(value);
         break;
     case Property::scaleX:
         setScaleX(value);
         break;
     case Property::scaleY:
         setScaleY(value);
         break;
     case Property::translateX:
         setTranslateX(value);
         break;
     case Property::translateY:
         setTranslateY(value);
         break;
     default:
         LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
     }
 }

 bool Group::isValidProperty(int propertyId) {
     return GroupProperties::isValidProperty(propertyId);
 }

 bool Group::GroupProperties::isValidProperty(int propertyId) {
     return propertyId >= 0 && propertyId < static_cast<int>(Property::count);
 }

 void Tree::draw(Canvas* outCanvas, SkColorFilter* colorFilter,
         const SkRect& bounds, bool needsMirroring, bool canReuseCache) {
     // The imageView can scale the canvas in different ways, in order to
     // avoid blurry scaling, we have to draw into a bitmap with exact pixel
     // size first. This bitmap size is determined by the bounds and the
     // canvas scale.
     SkMatrix canvasMatrix;
     outCanvas->getMatrix(&canvasMatrix);
     float canvasScaleX = 1.0f;
     float canvasScaleY = 1.0f;
     if (canvasMatrix.getSkewX() == 0 && canvasMatrix.getSkewY() == 0) {
         // Only use the scale value when there's no skew or rotation in the canvas matrix.
         // TODO: Add a cts test for drawing VD on a canvas with negative scaling factors.
         canvasScaleX = fabs(canvasMatrix.getScaleX());
         canvasScaleY = fabs(canvasMatrix.getScaleY());
     }
     int scaledWidth = (int) (bounds.width() * canvasScaleX);
     int scaledHeight = (int) (bounds.height() * canvasScaleY);
     scaledWidth = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledWidth);
     scaledHeight = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledHeight);

     if (scaledWidth <= 0 || scaledHeight <= 0) {
         return;
     }

     mStagingProperties.setScaledSize(scaledWidth, scaledHeight);
     int saveCount = outCanvas->save(SaveFlags::MatrixClip);
     outCanvas->translate(bounds.fLeft, bounds.fTop);

     // Handle RTL mirroring.
     if (needsMirroring) {
         outCanvas->translate(bounds.width(), 0);
         outCanvas->scale(-1.0f, 1.0f);
     }
     mStagingProperties.setColorFilter(colorFilter);

     // At this point, canvas has been translated to the right position.
     // And we use this bound for the destination rect for the drawBitmap, so
     // we offset to (0, 0);
     SkRect tmpBounds = bounds;
     tmpBounds.offsetTo(0, 0);
     mStagingProperties.setBounds(tmpBounds);
     outCanvas->drawVectorDrawable(this);
     outCanvas->restoreToCount(saveCount);
 }

 void Tree::drawStaging(Canvas* outCanvas) {
     bool redrawNeeded = allocateBitmapIfNeeded(&mStagingCache.bitmap,
             mStagingProperties.getScaledWidth(), mStagingProperties.getScaledHeight());
     // draw bitmap cache
     if (redrawNeeded || mStagingCache.dirty) {
         updateBitmapCache(&mStagingCache.bitmap, true);
         mStagingCache.dirty = false;
     }

     SkPaint tmpPaint;
     SkPaint* paint = updatePaint(&tmpPaint, &mStagingProperties);
     outCanvas->drawBitmap(mStagingCache.bitmap, 0, 0,
             mStagingCache.bitmap.width(), mStagingCache.bitmap.height(),
             mStagingProperties.getBounds().left(), mStagingProperties.getBounds().top(),
             mStagingProperties.getBounds().right(), mStagingProperties.getBounds().bottom(), paint);
 }

 SkPaint* Tree::getPaint() {
     return updatePaint(&mPaint, &mProperties);
 }

 // Update the given paint with alpha and color filter. Return nullptr if no color filter is
 // specified and root alpha is 1. Otherwise, return updated paint.
 SkPaint* Tree::updatePaint(SkPaint* outPaint, TreeProperties* prop) {
     if (prop->getRootAlpha() == 1.0f && prop->getColorFilter() == nullptr) {
         return nullptr;
     } else {
         outPaint->setColorFilter(mStagingProperties.getColorFilter());
         outPaint->setFilterQuality(kLow_SkFilterQuality);
         outPaint->setAlpha(prop->getRootAlpha() * 255);
         return outPaint;
     }
 }

 const SkBitmap& Tree::getBitmapUpdateIfDirty() {
     bool redrawNeeded = allocateBitmapIfNeeded(&mCache.bitmap, mProperties.getScaledWidth(),
             mProperties.getScaledHeight());
     if (redrawNeeded || mCache.dirty) {
         updateBitmapCache(&mCache.bitmap, false);
         mCache.dirty = false;
     }
     return mCache.bitmap;
 }

 void Tree::updateBitmapCache(SkBitmap* outCache, bool useStagingData) {
     outCache->eraseColor(SK_ColorTRANSPARENT);
     SkCanvas outCanvas(*outCache);
     float viewportWidth = useStagingData ?
             mStagingProperties.getViewportWidth() : mProperties.getViewportWidth();
     float viewportHeight = useStagingData ?
             mStagingProperties.getViewportHeight() : mProperties.getViewportHeight();
     float scaleX = outCache->width() / viewportWidth;
     float scaleY = outCache->height() / viewportHeight;
     mRootNode->draw(&outCanvas, SkMatrix::I(), scaleX, scaleY, useStagingData);
 }

 bool Tree::allocateBitmapIfNeeded(SkBitmap* outCache, int width, int height) {
     if (!canReuseBitmap(*outCache, width, height)) {
         SkImageInfo info = SkImageInfo::Make(width, height,
                 kN32_SkColorType, kPremul_SkAlphaType);
         outCache->setInfo(info);
         // TODO: Count the bitmap cache against app's java heap
         outCache->allocPixels(info);
         return true;
     }
     return false;
 }

 bool Tree::canReuseBitmap(const SkBitmap& bitmap, int width, int height) {
     return width == bitmap.width() && height == bitmap.height();
 }

 void Tree::onPropertyChanged(TreeProperties* prop) {
     if (prop == &mStagingProperties) {
         mStagingCache.dirty = true;
     } else {
         mCache.dirty = true;
     }
 }

 }; // namespace VectorDrawable

 }; // namespace uirenderer
 }; // namespace android
	/*
	* Copyright (C) 2015 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "VectorDrawable.h"

	#include "PathParser.h"
	#include "SkColorFilter.h"
	#include "SkImageInfo.h"
	#include "SkShader.h"
	#include <utils/Log.h>
	#include "utils/Macros.h"
	#include "utils/VectorDrawableUtils.h"

	#include <math.h>
	#include <string.h>

	namespace android {
	namespace uirenderer {
	namespace VectorDrawable {

	const int Tree::MAX_CACHED_BITMAP_SIZE = 2048;

	void Path::draw(SkCanvas* outCanvas, const SkMatrix& groupStackedMatrix, float scaleX, float scaleY,
	bool useStagingData) {
	float matrixScale = getMatrixScale(groupStackedMatrix);
	if (matrixScale == 0) {
	// When either x or y is scaled to 0, we don't need to draw anything.
	return;
	}

	SkMatrix pathMatrix(groupStackedMatrix);
	pathMatrix.postScale(scaleX, scaleY);

	//TODO: try apply the path matrix to the canvas instead of creating a new path.
	SkPath renderPath;
	renderPath.reset();

	if (useStagingData) {
	SkPath tmpPath;
	getStagingPath(&tmpPath);
	renderPath.addPath(tmpPath, pathMatrix);
	} else {
	renderPath.addPath(getUpdatedPath(), pathMatrix);
	}

	float minScale = fmin(scaleX, scaleY);
	float strokeScale = minScale * matrixScale;
	drawPath(outCanvas, renderPath, strokeScale, pathMatrix, useStagingData);
	}

	void Path::dump() {
	ALOGD("Path: %s has %zu points", mName.c_str(), mProperties.getData().points.size());
	}

	float Path::getMatrixScale(const SkMatrix& groupStackedMatrix) {
	// Given unit vectors A = (0, 1) and B = (1, 0).
	// After matrix mapping, we got A' and B'. Let theta = the angel b/t A' and B'.
	// Therefore, the final scale we want is min(\|A'\| * sin(theta), \|B'\| * sin(theta)),
	// which is (\|A'\| * \|B'\| * sin(theta)) / max (\|A'\|, \|B'\|);
	// If max (\|A'\|, \|B'\|) = 0, that means either x or y has a scale of 0.
	//
	// For non-skew case, which is most of the cases, matrix scale is computing exactly the
	// scale on x and y axis, and take the minimal of these two.
	// For skew case, an unit square will mapped to a parallelogram. And this function will
	// return the minimal height of the 2 bases.
	SkVector skVectors[2];
	skVectors[0].set(0, 1);
	skVectors[1].set(1, 0);
	groupStackedMatrix.mapVectors(skVectors, 2);
	float scaleX = hypotf(skVectors[0].fX, skVectors[0].fY);
	float scaleY = hypotf(skVectors[1].fX, skVectors[1].fY);
	float crossProduct = skVectors[0].cross(skVectors[1]);
	float maxScale = fmax(scaleX, scaleY);

	float matrixScale = 0;
	if (maxScale > 0) {
	matrixScale = fabs(crossProduct) / maxScale;
	}
	return matrixScale;
	}

	// Called from UI thread during the initial setup/theme change.
	Path::Path(const char* pathStr, size_t strLength) {
	PathParser::ParseResult result;
	Data data;
	PathParser::getPathDataFromString(&data, &result, pathStr, strLength);
	mStagingProperties.setData(data);
	}

	Path::Path(const Path& path) : Node(path) {
	mStagingProperties.syncProperties(path.mStagingProperties);
	}

	const SkPath& Path::getUpdatedPath() {
	if (mSkPathDirty) {
	mSkPath.reset();
	VectorDrawableUtils::verbsToPath(&mSkPath, mProperties.getData());
	mSkPathDirty = false;
	}
	return mSkPath;
	}

	void Path::getStagingPath(SkPath* outPath) {
	outPath->reset();
	VectorDrawableUtils::verbsToPath(outPath, mStagingProperties.getData());
	}

	void Path::syncProperties() {
	if (mStagingPropertiesDirty) {
	mProperties.syncProperties(mStagingProperties);
	} else {
	mStagingProperties.syncProperties(mProperties);
	}
	mStagingPropertiesDirty = false;
	}

	FullPath::FullPath(const FullPath& path) : Path(path) {
	mStagingProperties.syncProperties(path.mStagingProperties);
	}

	static void applyTrim(SkPath* outPath, const SkPath& inPath, float trimPathStart, float trimPathEnd,
	float trimPathOffset) {
	if (trimPathStart == 0.0f && trimPathEnd == 1.0f) {
	*outPath = inPath;
	return;
	}
	outPath->reset();
	if (trimPathStart == trimPathEnd) {
	// Trimmed path should be empty.
	return;
	}
	SkPathMeasure measure(inPath, false);
	float len = SkScalarToFloat(measure.getLength());
	float start = len * fmod((trimPathStart + trimPathOffset), 1.0f);
	float end = len * fmod((trimPathEnd + trimPathOffset), 1.0f);

	if (start > end) {
	measure.getSegment(start, len, outPath, true);
	if (end > 0) {
	measure.getSegment(0, end, outPath, true);
	}
	} else {
	measure.getSegment(start, end, outPath, true);
	}
	}

	const SkPath& FullPath::getUpdatedPath() {
	if (!mSkPathDirty && !mProperties.mTrimDirty) {
	return mTrimmedSkPath;
	}
	Path::getUpdatedPath();
	if (mProperties.getTrimPathStart() != 0.0f \|\| mProperties.getTrimPathEnd() != 1.0f) {
	mProperties.mTrimDirty = false;
	applyTrim(&mTrimmedSkPath, mSkPath, mProperties.getTrimPathStart(),
	mProperties.getTrimPathEnd(), mProperties.getTrimPathOffset());
	return mTrimmedSkPath;
	} else {
	return mSkPath;
	}
	}

	void FullPath::getStagingPath(SkPath* outPath) {
	Path::getStagingPath(outPath);
	SkPath inPath = *outPath;
	applyTrim(outPath, inPath, mStagingProperties.getTrimPathStart(),
	mStagingProperties.getTrimPathEnd(), mStagingProperties.getTrimPathOffset());
	}

	void FullPath::dump() {
	Path::dump();
	ALOGD("stroke width, color, alpha: %f, %d, %f, fill color, alpha: %d, %f",
	mProperties.getStrokeWidth(), mProperties.getStrokeColor(), mProperties.getStrokeAlpha(),
	mProperties.getFillColor(), mProperties.getFillAlpha());
	}


	inline SkColor applyAlpha(SkColor color, float alpha) {
	int alphaBytes = SkColorGetA(color);
	return SkColorSetA(color, alphaBytes * alpha);
	}

	void FullPath::drawPath(SkCanvas* outCanvas, SkPath& renderPath, float strokeScale,
	const SkMatrix& matrix, bool useStagingData){
	const FullPathProperties& properties = useStagingData ? mStagingProperties : mProperties;

	// Draw path's fill, if fill color or gradient is valid
	bool needsFill = false;
	SkPaint paint;
	if (properties.getFillGradient() != nullptr) {
	paint.setColor(applyAlpha(SK_ColorBLACK, properties.getFillAlpha()));
	SkShader* newShader = properties.getFillGradient()->newWithLocalMatrix(matrix);
	paint.setShader(newShader);
	needsFill = true;
	} else if (properties.getFillColor() != SK_ColorTRANSPARENT) {
	paint.setColor(applyAlpha(properties.getFillColor(), properties.getFillAlpha()));
	needsFill = true;
	}

	if (needsFill) {
	paint.setStyle(SkPaint::Style::kFill_Style);
	paint.setAntiAlias(true);
	SkPath::FillType ft = static_cast<SkPath::FillType>(properties.getFillType());
	renderPath.setFillType(ft);
	outCanvas->drawPath(renderPath, paint);
	}

	// Draw path's stroke, if stroke color or Gradient is valid
	bool needsStroke = false;
	if (properties.getStrokeGradient() != nullptr) {
	paint.setColor(applyAlpha(SK_ColorBLACK, properties.getStrokeAlpha()));
	SkShader* newShader = properties.getStrokeGradient()->newWithLocalMatrix(matrix);
	paint.setShader(newShader);
	needsStroke = true;
	} else if (properties.getStrokeColor() != SK_ColorTRANSPARENT) {
	paint.setColor(applyAlpha(properties.getStrokeColor(), properties.getStrokeAlpha()));
	needsStroke = true;
	}
	if (needsStroke) {
	paint.setStyle(SkPaint::Style::kStroke_Style);
	paint.setAntiAlias(true);
	paint.setStrokeJoin(SkPaint::Join(properties.getStrokeLineJoin()));
	paint.setStrokeCap(SkPaint::Cap(properties.getStrokeLineCap()));
	paint.setStrokeMiter(properties.getStrokeMiterLimit());
	paint.setStrokeWidth(properties.getStrokeWidth() * strokeScale);
	outCanvas->drawPath(renderPath, paint);
	}
	}

	void FullPath::syncProperties() {
	Path::syncProperties();

	if (mStagingPropertiesDirty) {
	mProperties.syncProperties(mStagingProperties);
	} else {
	// Update staging property with property values from animation.
	mStagingProperties.syncProperties(mProperties);
	}
	mStagingPropertiesDirty = false;
	}

	REQUIRE_COMPATIBLE_LAYOUT(FullPath::FullPathProperties::PrimitiveFields);

	static_assert(sizeof(float) == sizeof(int32_t), "float is not the same size as int32_t");
	static_assert(sizeof(SkColor) == sizeof(int32_t), "SkColor is not the same size as int32_t");

	bool FullPath::FullPathProperties::copyProperties(int8_t* outProperties, int length) const {
	int propertyDataSize = sizeof(FullPathProperties::PrimitiveFields);
	if (length != propertyDataSize) {
	LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
	propertyDataSize, length);
	return false;
	}

	PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
	*out = mPrimitiveFields;
	return true;
	}

	void FullPath::FullPathProperties::setColorPropertyValue(int propertyId, int32_t value) {
	Property currentProperty = static_cast<Property>(propertyId);
	if (currentProperty == Property::strokeColor) {
	setStrokeColor(value);
	} else if (currentProperty == Property::fillColor) {
	setFillColor(value);
	} else {
	LOG_ALWAYS_FATAL("Error setting color property on FullPath: No valid property"
	" with id: %d", propertyId);
	}
	}

	void FullPath::FullPathProperties::setPropertyValue(int propertyId, float value) {
	Property property = static_cast<Property>(propertyId);
	switch (property) {
	case Property::strokeWidth:
	setStrokeWidth(value);
	break;
	case Property::strokeAlpha:
	setStrokeAlpha(value);
	break;
	case Property::fillAlpha:
	setFillAlpha(value);
	break;
	case Property::trimPathStart:
	setTrimPathStart(value);
	break;
	case Property::trimPathEnd:
	setTrimPathEnd(value);
	break;
	case Property::trimPathOffset:
	setTrimPathOffset(value);
	break;
	default:
	LOG_ALWAYS_FATAL("Invalid property id: %d for animation", propertyId);
	break;
	}
	}

	void ClipPath::drawPath(SkCanvas* outCanvas, SkPath& renderPath,
	float strokeScale, const SkMatrix& matrix, bool useStagingData){
	outCanvas->clipPath(renderPath, SkRegion::kIntersect_Op);
	}

	Group::Group(const Group& group) : Node(group) {
	mStagingProperties.syncProperties(group.mStagingProperties);
	}

	void Group::draw(SkCanvas* outCanvas, const SkMatrix& currentMatrix, float scaleX,
	float scaleY, bool useStagingData) {
	// TODO: Try apply the matrix to the canvas instead of passing it down the tree

	// Calculate current group's matrix by preConcat the parent's and
	// and the current one on the top of the stack.
	// Basically the Mfinal = Mviewport * M0 * M1 * M2;
	// Mi the local matrix at level i of the group tree.
	SkMatrix stackedMatrix;
	const GroupProperties& prop = useStagingData ? mStagingProperties : mProperties;
	getLocalMatrix(&stackedMatrix, prop);
	stackedMatrix.postConcat(currentMatrix);

	// Save the current clip information, which is local to this group.
	outCanvas->save();
	// Draw the group tree in the same order as the XML file.
	for (auto& child : mChildren) {
	child->draw(outCanvas, stackedMatrix, scaleX, scaleY, useStagingData);
	}
	// Restore the previous clip information.
	outCanvas->restore();
	}

	void Group::dump() {
	ALOGD("Group %s has %zu children: ", mName.c_str(), mChildren.size());
	ALOGD("Group translateX, Y : %f, %f, scaleX, Y: %f, %f", mProperties.getTranslateX(),
	mProperties.getTranslateY(), mProperties.getScaleX(), mProperties.getScaleY());
	for (size_t i = 0; i < mChildren.size(); i++) {
	mChildren[i]->dump();
	}
	}

	void Group::syncProperties() {
	// Copy over the dirty staging properties
	if (mStagingPropertiesDirty) {
	mProperties.syncProperties(mStagingProperties);
	} else {
	mStagingProperties.syncProperties(mProperties);
	}
	mStagingPropertiesDirty = false;
	for (auto& child : mChildren) {
	child->syncProperties();
	}
	}

	void Group::getLocalMatrix(SkMatrix* outMatrix, const GroupProperties& properties) {
	outMatrix->reset();
	// TODO: use rotate(mRotate, mPivotX, mPivotY) and scale with pivot point, instead of
	// translating to pivot for rotating and scaling, then translating back.
	outMatrix->postTranslate(-properties.getPivotX(), -properties.getPivotY());
	outMatrix->postScale(properties.getScaleX(), properties.getScaleY());
	outMatrix->postRotate(properties.getRotation(), 0, 0);
	outMatrix->postTranslate(properties.getTranslateX() + properties.getPivotX(),
	properties.getTranslateY() + properties.getPivotY());
	}

	void Group::addChild(Node* child) {
	mChildren.emplace_back(child);
	if (mPropertyChangedListener != nullptr) {
	child->setPropertyChangedListener(mPropertyChangedListener);
	}
	}

	bool Group::GroupProperties::copyProperties(float* outProperties, int length) const {
	int propertyCount = static_cast<int>(Property::count);
	if (length != propertyCount) {
	LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
	propertyCount, length);
	return false;
	}

	PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
	*out = mPrimitiveFields;
	return true;
	}

	// TODO: Consider animating the properties as float pointers
	// Called on render thread
	float Group::GroupProperties::getPropertyValue(int propertyId) const {
	Property currentProperty = static_cast<Property>(propertyId);
	switch (currentProperty) {
	case Property::rotate:
	return getRotation();
	case Property::pivotX:
	return getPivotX();
	case Property::pivotY:
	return getPivotY();
	case Property::scaleX:
	return getScaleX();
	case Property::scaleY:
	return getScaleY();
	case Property::translateX:
	return getTranslateX();
	case Property::translateY:
	return getTranslateY();
	default:
	LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
	return 0;
	}
	}

	// Called on render thread
	void Group::GroupProperties::setPropertyValue(int propertyId, float value) {
	Property currentProperty = static_cast<Property>(propertyId);
	switch (currentProperty) {
	case Property::rotate:
	setRotation(value);
	break;
	case Property::pivotX:
	setPivotX(value);
	break;
	case Property::pivotY:
	setPivotY(value);
	break;
	case Property::scaleX:
	setScaleX(value);
	break;
	case Property::scaleY:
	setScaleY(value);
	break;
	case Property::translateX:
	setTranslateX(value);
	break;
	case Property::translateY:
	setTranslateY(value);
	break;
	default:
	LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
	}
	}

	bool Group::isValidProperty(int propertyId) {
	return GroupProperties::isValidProperty(propertyId);
	}

	bool Group::GroupProperties::isValidProperty(int propertyId) {
	return propertyId >= 0 && propertyId < static_cast<int>(Property::count);
	}

	void Tree::draw(Canvas* outCanvas, SkColorFilter* colorFilter,
	const SkRect& bounds, bool needsMirroring, bool canReuseCache) {
	// The imageView can scale the canvas in different ways, in order to
	// avoid blurry scaling, we have to draw into a bitmap with exact pixel
	// size first. This bitmap size is determined by the bounds and the
	// canvas scale.
	SkMatrix canvasMatrix;
	outCanvas->getMatrix(&canvasMatrix);
	float canvasScaleX = 1.0f;
	float canvasScaleY = 1.0f;
	if (canvasMatrix.getSkewX() == 0 && canvasMatrix.getSkewY() == 0) {
	// Only use the scale value when there's no skew or rotation in the canvas matrix.
	// TODO: Add a cts test for drawing VD on a canvas with negative scaling factors.
	canvasScaleX = fabs(canvasMatrix.getScaleX());
	canvasScaleY = fabs(canvasMatrix.getScaleY());
	}
	int scaledWidth = (int) (bounds.width() * canvasScaleX);
	int scaledHeight = (int) (bounds.height() * canvasScaleY);
	scaledWidth = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledWidth);
	scaledHeight = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledHeight);

	if (scaledWidth <= 0 \|\| scaledHeight <= 0) {
	return;
	}

	mStagingProperties.setScaledSize(scaledWidth, scaledHeight);
	int saveCount = outCanvas->save(SaveFlags::MatrixClip);
	outCanvas->translate(bounds.fLeft, bounds.fTop);

	// Handle RTL mirroring.
	if (needsMirroring) {
	outCanvas->translate(bounds.width(), 0);
	outCanvas->scale(-1.0f, 1.0f);
	}
	mStagingProperties.setColorFilter(colorFilter);

	// At this point, canvas has been translated to the right position.
	// And we use this bound for the destination rect for the drawBitmap, so
	// we offset to (0, 0);
	SkRect tmpBounds = bounds;
	tmpBounds.offsetTo(0, 0);
	mStagingProperties.setBounds(tmpBounds);
	outCanvas->drawVectorDrawable(this);
	outCanvas->restoreToCount(saveCount);
	}

	void Tree::drawStaging(Canvas* outCanvas) {
	bool redrawNeeded = allocateBitmapIfNeeded(&mStagingCache.bitmap,
	mStagingProperties.getScaledWidth(), mStagingProperties.getScaledHeight());
	// draw bitmap cache
	if (redrawNeeded \|\| mStagingCache.dirty) {
	updateBitmapCache(&mStagingCache.bitmap, true);
	mStagingCache.dirty = false;
	}

	SkPaint tmpPaint;
	SkPaint* paint = updatePaint(&tmpPaint, &mStagingProperties);
	outCanvas->drawBitmap(mStagingCache.bitmap, 0, 0,
	mStagingCache.bitmap.width(), mStagingCache.bitmap.height(),
	mStagingProperties.getBounds().left(), mStagingProperties.getBounds().top(),
	mStagingProperties.getBounds().right(), mStagingProperties.getBounds().bottom(), paint);
	}

	SkPaint* Tree::getPaint() {
	return updatePaint(&mPaint, &mProperties);
	}

	// Update the given paint with alpha and color filter. Return nullptr if no color filter is
	// specified and root alpha is 1. Otherwise, return updated paint.
	SkPaint* Tree::updatePaint(SkPaint* outPaint, TreeProperties* prop) {
	if (prop->getRootAlpha() == 1.0f && prop->getColorFilter() == nullptr) {
	return nullptr;
	} else {
	outPaint->setColorFilter(mStagingProperties.getColorFilter());
	outPaint->setFilterQuality(kLow_SkFilterQuality);
	outPaint->setAlpha(prop->getRootAlpha() * 255);
	return outPaint;
	}
	}

	const SkBitmap& Tree::getBitmapUpdateIfDirty() {
	bool redrawNeeded = allocateBitmapIfNeeded(&mCache.bitmap, mProperties.getScaledWidth(),
	mProperties.getScaledHeight());
	if (redrawNeeded \|\| mCache.dirty) {
	updateBitmapCache(&mCache.bitmap, false);
	mCache.dirty = false;
	}
	return mCache.bitmap;
	}

	void Tree::updateBitmapCache(SkBitmap* outCache, bool useStagingData) {
	outCache->eraseColor(SK_ColorTRANSPARENT);
	SkCanvas outCanvas(*outCache);
	float viewportWidth = useStagingData ?
	mStagingProperties.getViewportWidth() : mProperties.getViewportWidth();
	float viewportHeight = useStagingData ?
	mStagingProperties.getViewportHeight() : mProperties.getViewportHeight();
	float scaleX = outCache->width() / viewportWidth;
	float scaleY = outCache->height() / viewportHeight;
	mRootNode->draw(&outCanvas, SkMatrix::I(), scaleX, scaleY, useStagingData);
	}

	bool Tree::allocateBitmapIfNeeded(SkBitmap* outCache, int width, int height) {
	if (!canReuseBitmap(*outCache, width, height)) {
	SkImageInfo info = SkImageInfo::Make(width, height,
	kN32_SkColorType, kPremul_SkAlphaType);
	outCache->setInfo(info);
	// TODO: Count the bitmap cache against app's java heap
	outCache->allocPixels(info);
	return true;
	}
	return false;
	}

	bool Tree::canReuseBitmap(const SkBitmap& bitmap, int width, int height) {
	return width == bitmap.width() && height == bitmap.height();
	}

	void Tree::onPropertyChanged(TreeProperties* prop) {
	if (prop == &mStagingProperties) {
	mStagingCache.dirty = true;
	} else {
	mCache.dirty = true;
	}
	}

	}; // namespace VectorDrawable

	}; // namespace uirenderer
	}; // namespace android