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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "VectorDrawable.h"
     18 
     19 #include "PathParser.h"
     20 #include "SkColorFilter.h"
     21 #include "SkImageInfo.h"
     22 #include "SkShader.h"
     23 #include <utils/Log.h>
     24 #include "utils/Macros.h"
     25 #include "utils/VectorDrawableUtils.h"
     26 
     27 #include <math.h>
     28 #include <string.h>
     29 
     30 namespace android {
     31 namespace uirenderer {
     32 namespace VectorDrawable {
     33 
     34 const int Tree::MAX_CACHED_BITMAP_SIZE = 2048;
     35 
     36 void Path::draw(SkCanvas* outCanvas, const SkMatrix& groupStackedMatrix, float scaleX, float scaleY,
     37         bool useStagingData) {
     38     float matrixScale = getMatrixScale(groupStackedMatrix);
     39     if (matrixScale == 0) {
     40         // When either x or y is scaled to 0, we don't need to draw anything.
     41         return;
     42     }
     43 
     44     SkMatrix pathMatrix(groupStackedMatrix);
     45     pathMatrix.postScale(scaleX, scaleY);
     46 
     47     //TODO: try apply the path matrix to the canvas instead of creating a new path.
     48     SkPath renderPath;
     49     renderPath.reset();
     50 
     51     if (useStagingData) {
     52         SkPath tmpPath;
     53         getStagingPath(&tmpPath);
     54         renderPath.addPath(tmpPath, pathMatrix);
     55     } else {
     56         renderPath.addPath(getUpdatedPath(), pathMatrix);
     57     }
     58 
     59     float minScale = fmin(scaleX, scaleY);
     60     float strokeScale = minScale * matrixScale;
     61     drawPath(outCanvas, renderPath, strokeScale, pathMatrix, useStagingData);
     62 }
     63 
     64 void Path::dump() {
     65     ALOGD("Path: %s has %zu points", mName.c_str(), mProperties.getData().points.size());
     66 }
     67 
     68 float Path::getMatrixScale(const SkMatrix& groupStackedMatrix) {
     69     // Given unit vectors A = (0, 1) and B = (1, 0).
     70     // After matrix mapping, we got A' and B'. Let theta = the angel b/t A' and B'.
     71     // Therefore, the final scale we want is min(|A'| * sin(theta), |B'| * sin(theta)),
     72     // which is (|A'| * |B'| * sin(theta)) / max (|A'|, |B'|);
     73     // If  max (|A'|, |B'|) = 0, that means either x or y has a scale of 0.
     74     //
     75     // For non-skew case, which is most of the cases, matrix scale is computing exactly the
     76     // scale on x and y axis, and take the minimal of these two.
     77     // For skew case, an unit square will mapped to a parallelogram. And this function will
     78     // return the minimal height of the 2 bases.
     79     SkVector skVectors[2];
     80     skVectors[0].set(0, 1);
     81     skVectors[1].set(1, 0);
     82     groupStackedMatrix.mapVectors(skVectors, 2);
     83     float scaleX = hypotf(skVectors[0].fX, skVectors[0].fY);
     84     float scaleY = hypotf(skVectors[1].fX, skVectors[1].fY);
     85     float crossProduct = skVectors[0].cross(skVectors[1]);
     86     float maxScale = fmax(scaleX, scaleY);
     87 
     88     float matrixScale = 0;
     89     if (maxScale > 0) {
     90         matrixScale = fabs(crossProduct) / maxScale;
     91     }
     92     return matrixScale;
     93 }
     94 
     95 // Called from UI thread during the initial setup/theme change.
     96 Path::Path(const char* pathStr, size_t strLength) {
     97     PathParser::ParseResult result;
     98     Data data;
     99     PathParser::getPathDataFromAsciiString(&data, &result, pathStr, strLength);
    100     mStagingProperties.setData(data);
    101 }
    102 
    103 Path::Path(const Path& path) : Node(path) {
    104     mStagingProperties.syncProperties(path.mStagingProperties);
    105 }
    106 
    107 const SkPath& Path::getUpdatedPath() {
    108     if (mSkPathDirty) {
    109         mSkPath.reset();
    110         VectorDrawableUtils::verbsToPath(&mSkPath, mProperties.getData());
    111         mSkPathDirty = false;
    112     }
    113     return mSkPath;
    114 }
    115 
    116 void Path::getStagingPath(SkPath* outPath) {
    117     outPath->reset();
    118     VectorDrawableUtils::verbsToPath(outPath, mStagingProperties.getData());
    119 }
    120 
    121 void Path::syncProperties() {
    122     if (mStagingPropertiesDirty) {
    123         mProperties.syncProperties(mStagingProperties);
    124     } else {
    125         mStagingProperties.syncProperties(mProperties);
    126     }
    127     mStagingPropertiesDirty = false;
    128 }
    129 
    130 FullPath::FullPath(const FullPath& path) : Path(path) {
    131     mStagingProperties.syncProperties(path.mStagingProperties);
    132 }
    133 
    134 static void applyTrim(SkPath* outPath, const SkPath& inPath, float trimPathStart, float trimPathEnd,
    135         float trimPathOffset) {
    136     if (trimPathStart == 0.0f && trimPathEnd == 1.0f) {
    137         *outPath = inPath;
    138         return;
    139     }
    140     outPath->reset();
    141     if (trimPathStart == trimPathEnd) {
    142         // Trimmed path should be empty.
    143         return;
    144     }
    145     SkPathMeasure measure(inPath, false);
    146     float len = SkScalarToFloat(measure.getLength());
    147     float start = len * fmod((trimPathStart + trimPathOffset), 1.0f);
    148     float end = len * fmod((trimPathEnd + trimPathOffset), 1.0f);
    149 
    150     if (start > end) {
    151         measure.getSegment(start, len, outPath, true);
    152         if (end > 0) {
    153             measure.getSegment(0, end, outPath, true);
    154         }
    155     } else {
    156         measure.getSegment(start, end, outPath, true);
    157     }
    158 }
    159 
    160 const SkPath& FullPath::getUpdatedPath() {
    161     if (!mSkPathDirty && !mProperties.mTrimDirty) {
    162         return mTrimmedSkPath;
    163     }
    164     Path::getUpdatedPath();
    165     if (mProperties.getTrimPathStart() != 0.0f || mProperties.getTrimPathEnd() != 1.0f) {
    166         mProperties.mTrimDirty = false;
    167         applyTrim(&mTrimmedSkPath, mSkPath, mProperties.getTrimPathStart(),
    168                 mProperties.getTrimPathEnd(), mProperties.getTrimPathOffset());
    169         return mTrimmedSkPath;
    170     } else {
    171         return mSkPath;
    172     }
    173 }
    174 
    175 void FullPath::getStagingPath(SkPath* outPath) {
    176     Path::getStagingPath(outPath);
    177     SkPath inPath = *outPath;
    178     applyTrim(outPath, inPath, mStagingProperties.getTrimPathStart(),
    179             mStagingProperties.getTrimPathEnd(), mStagingProperties.getTrimPathOffset());
    180 }
    181 
    182 void FullPath::dump() {
    183     Path::dump();
    184     ALOGD("stroke width, color, alpha: %f, %d, %f, fill color, alpha: %d, %f",
    185             mProperties.getStrokeWidth(), mProperties.getStrokeColor(), mProperties.getStrokeAlpha(),
    186             mProperties.getFillColor(), mProperties.getFillAlpha());
    187 }
    188 
    189 
    190 inline SkColor applyAlpha(SkColor color, float alpha) {
    191     int alphaBytes = SkColorGetA(color);
    192     return SkColorSetA(color, alphaBytes * alpha);
    193 }
    194 
    195 void FullPath::drawPath(SkCanvas* outCanvas, SkPath& renderPath, float strokeScale,
    196                         const SkMatrix& matrix, bool useStagingData){
    197     const FullPathProperties& properties = useStagingData ? mStagingProperties : mProperties;
    198 
    199     // Draw path's fill, if fill color or gradient is valid
    200     bool needsFill = false;
    201     SkPaint paint;
    202     if (properties.getFillGradient() != nullptr) {
    203         paint.setColor(applyAlpha(SK_ColorBLACK, properties.getFillAlpha()));
    204         SkShader* newShader = properties.getFillGradient()->newWithLocalMatrix(matrix);
    205         // newWithLocalMatrix(...) creates a new SkShader and returns a bare pointer. We need to
    206         // remove the extra ref so that the ref count is correctly managed.
    207         paint.setShader(newShader)->unref();
    208         needsFill = true;
    209     } else if (properties.getFillColor() != SK_ColorTRANSPARENT) {
    210         paint.setColor(applyAlpha(properties.getFillColor(), properties.getFillAlpha()));
    211         needsFill = true;
    212     }
    213 
    214     if (needsFill) {
    215         paint.setStyle(SkPaint::Style::kFill_Style);
    216         paint.setAntiAlias(true);
    217         SkPath::FillType ft = static_cast<SkPath::FillType>(properties.getFillType());
    218         renderPath.setFillType(ft);
    219         outCanvas->drawPath(renderPath, paint);
    220     }
    221 
    222     // Draw path's stroke, if stroke color or Gradient is valid
    223     bool needsStroke = false;
    224     if (properties.getStrokeGradient() != nullptr) {
    225         paint.setColor(applyAlpha(SK_ColorBLACK, properties.getStrokeAlpha()));
    226         SkShader* newShader = properties.getStrokeGradient()->newWithLocalMatrix(matrix);
    227         // newWithLocalMatrix(...) creates a new SkShader and returns a bare pointer. We need to
    228         // remove the extra ref so that the ref count is correctly managed.
    229         paint.setShader(newShader)->unref();
    230         needsStroke = true;
    231     } else if (properties.getStrokeColor() != SK_ColorTRANSPARENT) {
    232         paint.setColor(applyAlpha(properties.getStrokeColor(), properties.getStrokeAlpha()));
    233         needsStroke = true;
    234     }
    235     if (needsStroke) {
    236         paint.setStyle(SkPaint::Style::kStroke_Style);
    237         paint.setAntiAlias(true);
    238         paint.setStrokeJoin(SkPaint::Join(properties.getStrokeLineJoin()));
    239         paint.setStrokeCap(SkPaint::Cap(properties.getStrokeLineCap()));
    240         paint.setStrokeMiter(properties.getStrokeMiterLimit());
    241         paint.setStrokeWidth(properties.getStrokeWidth() * strokeScale);
    242         outCanvas->drawPath(renderPath, paint);
    243     }
    244 }
    245 
    246 void FullPath::syncProperties() {
    247     Path::syncProperties();
    248 
    249     if (mStagingPropertiesDirty) {
    250         mProperties.syncProperties(mStagingProperties);
    251     } else {
    252         // Update staging property with property values from animation.
    253         mStagingProperties.syncProperties(mProperties);
    254     }
    255     mStagingPropertiesDirty = false;
    256 }
    257 
    258 REQUIRE_COMPATIBLE_LAYOUT(FullPath::FullPathProperties::PrimitiveFields);
    259 
    260 static_assert(sizeof(float) == sizeof(int32_t), "float is not the same size as int32_t");
    261 static_assert(sizeof(SkColor) == sizeof(int32_t), "SkColor is not the same size as int32_t");
    262 
    263 bool FullPath::FullPathProperties::copyProperties(int8_t* outProperties, int length) const {
    264     int propertyDataSize = sizeof(FullPathProperties::PrimitiveFields);
    265     if (length != propertyDataSize) {
    266         LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
    267                 propertyDataSize, length);
    268         return false;
    269     }
    270 
    271     PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
    272     *out = mPrimitiveFields;
    273     return true;
    274 }
    275 
    276 void FullPath::FullPathProperties::setColorPropertyValue(int propertyId, int32_t value) {
    277     Property currentProperty = static_cast<Property>(propertyId);
    278     if (currentProperty == Property::strokeColor) {
    279         setStrokeColor(value);
    280     } else if (currentProperty == Property::fillColor) {
    281         setFillColor(value);
    282     } else {
    283         LOG_ALWAYS_FATAL("Error setting color property on FullPath: No valid property"
    284                 " with id: %d", propertyId);
    285     }
    286 }
    287 
    288 void FullPath::FullPathProperties::setPropertyValue(int propertyId, float value) {
    289     Property property = static_cast<Property>(propertyId);
    290     switch (property) {
    291     case Property::strokeWidth:
    292         setStrokeWidth(value);
    293         break;
    294     case Property::strokeAlpha:
    295         setStrokeAlpha(value);
    296         break;
    297     case Property::fillAlpha:
    298         setFillAlpha(value);
    299         break;
    300     case Property::trimPathStart:
    301         setTrimPathStart(value);
    302         break;
    303     case Property::trimPathEnd:
    304         setTrimPathEnd(value);
    305         break;
    306     case Property::trimPathOffset:
    307         setTrimPathOffset(value);
    308         break;
    309     default:
    310         LOG_ALWAYS_FATAL("Invalid property id: %d for animation", propertyId);
    311         break;
    312     }
    313 }
    314 
    315 void ClipPath::drawPath(SkCanvas* outCanvas, SkPath& renderPath,
    316         float strokeScale, const SkMatrix& matrix, bool useStagingData){
    317     outCanvas->clipPath(renderPath, SkRegion::kIntersect_Op);
    318 }
    319 
    320 Group::Group(const Group& group) : Node(group) {
    321     mStagingProperties.syncProperties(group.mStagingProperties);
    322 }
    323 
    324 void Group::draw(SkCanvas* outCanvas, const SkMatrix& currentMatrix, float scaleX,
    325         float scaleY, bool useStagingData) {
    326     // TODO: Try apply the matrix to the canvas instead of passing it down the tree
    327 
    328     // Calculate current group's matrix by preConcat the parent's and
    329     // and the current one on the top of the stack.
    330     // Basically the Mfinal = Mviewport * M0 * M1 * M2;
    331     // Mi the local matrix at level i of the group tree.
    332     SkMatrix stackedMatrix;
    333     const GroupProperties& prop = useStagingData ? mStagingProperties : mProperties;
    334     getLocalMatrix(&stackedMatrix, prop);
    335     stackedMatrix.postConcat(currentMatrix);
    336 
    337     // Save the current clip information, which is local to this group.
    338     outCanvas->save();
    339     // Draw the group tree in the same order as the XML file.
    340     for (auto& child : mChildren) {
    341         child->draw(outCanvas, stackedMatrix, scaleX, scaleY, useStagingData);
    342     }
    343     // Restore the previous clip information.
    344     outCanvas->restore();
    345 }
    346 
    347 void Group::dump() {
    348     ALOGD("Group %s has %zu children: ", mName.c_str(), mChildren.size());
    349     ALOGD("Group translateX, Y : %f, %f, scaleX, Y: %f, %f", mProperties.getTranslateX(),
    350             mProperties.getTranslateY(), mProperties.getScaleX(), mProperties.getScaleY());
    351     for (size_t i = 0; i < mChildren.size(); i++) {
    352         mChildren[i]->dump();
    353     }
    354 }
    355 
    356 void Group::syncProperties() {
    357     // Copy over the dirty staging properties
    358     if (mStagingPropertiesDirty) {
    359         mProperties.syncProperties(mStagingProperties);
    360     } else {
    361         mStagingProperties.syncProperties(mProperties);
    362     }
    363     mStagingPropertiesDirty = false;
    364     for (auto& child : mChildren) {
    365         child->syncProperties();
    366     }
    367 }
    368 
    369 void Group::getLocalMatrix(SkMatrix* outMatrix, const GroupProperties& properties) {
    370     outMatrix->reset();
    371     // TODO: use rotate(mRotate, mPivotX, mPivotY) and scale with pivot point, instead of
    372     // translating to pivot for rotating and scaling, then translating back.
    373     outMatrix->postTranslate(-properties.getPivotX(), -properties.getPivotY());
    374     outMatrix->postScale(properties.getScaleX(), properties.getScaleY());
    375     outMatrix->postRotate(properties.getRotation(), 0, 0);
    376     outMatrix->postTranslate(properties.getTranslateX() + properties.getPivotX(),
    377             properties.getTranslateY() + properties.getPivotY());
    378 }
    379 
    380 void Group::addChild(Node* child) {
    381     mChildren.emplace_back(child);
    382     if (mPropertyChangedListener != nullptr) {
    383         child->setPropertyChangedListener(mPropertyChangedListener);
    384     }
    385 }
    386 
    387 bool Group::GroupProperties::copyProperties(float* outProperties, int length) const {
    388     int propertyCount = static_cast<int>(Property::count);
    389     if (length != propertyCount) {
    390         LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
    391                 propertyCount, length);
    392         return false;
    393     }
    394 
    395     PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
    396     *out = mPrimitiveFields;
    397     return true;
    398 }
    399 
    400 // TODO: Consider animating the properties as float pointers
    401 // Called on render thread
    402 float Group::GroupProperties::getPropertyValue(int propertyId) const {
    403     Property currentProperty = static_cast<Property>(propertyId);
    404     switch (currentProperty) {
    405     case Property::rotate:
    406         return getRotation();
    407     case Property::pivotX:
    408         return getPivotX();
    409     case Property::pivotY:
    410         return getPivotY();
    411     case Property::scaleX:
    412         return getScaleX();
    413     case Property::scaleY:
    414         return getScaleY();
    415     case Property::translateX:
    416         return getTranslateX();
    417     case Property::translateY:
    418         return getTranslateY();
    419     default:
    420         LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
    421         return 0;
    422     }
    423 }
    424 
    425 // Called on render thread
    426 void Group::GroupProperties::setPropertyValue(int propertyId, float value) {
    427     Property currentProperty = static_cast<Property>(propertyId);
    428     switch (currentProperty) {
    429     case Property::rotate:
    430         setRotation(value);
    431         break;
    432     case Property::pivotX:
    433         setPivotX(value);
    434         break;
    435     case Property::pivotY:
    436         setPivotY(value);
    437         break;
    438     case Property::scaleX:
    439         setScaleX(value);
    440         break;
    441     case Property::scaleY:
    442         setScaleY(value);
    443         break;
    444     case Property::translateX:
    445         setTranslateX(value);
    446         break;
    447     case Property::translateY:
    448         setTranslateY(value);
    449         break;
    450     default:
    451         LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
    452     }
    453 }
    454 
    455 bool Group::isValidProperty(int propertyId) {
    456     return GroupProperties::isValidProperty(propertyId);
    457 }
    458 
    459 bool Group::GroupProperties::isValidProperty(int propertyId) {
    460     return propertyId >= 0 && propertyId < static_cast<int>(Property::count);
    461 }
    462 
    463 int Tree::draw(Canvas* outCanvas, SkColorFilter* colorFilter,
    464         const SkRect& bounds, bool needsMirroring, bool canReuseCache) {
    465     // The imageView can scale the canvas in different ways, in order to
    466     // avoid blurry scaling, we have to draw into a bitmap with exact pixel
    467     // size first. This bitmap size is determined by the bounds and the
    468     // canvas scale.
    469     SkMatrix canvasMatrix;
    470     outCanvas->getMatrix(&canvasMatrix);
    471     float canvasScaleX = 1.0f;
    472     float canvasScaleY = 1.0f;
    473     if (canvasMatrix.getSkewX() == 0 && canvasMatrix.getSkewY() == 0) {
    474         // Only use the scale value when there's no skew or rotation in the canvas matrix.
    475         // TODO: Add a cts test for drawing VD on a canvas with negative scaling factors.
    476         canvasScaleX = fabs(canvasMatrix.getScaleX());
    477         canvasScaleY = fabs(canvasMatrix.getScaleY());
    478     }
    479     int scaledWidth = (int) (bounds.width() * canvasScaleX);
    480     int scaledHeight = (int) (bounds.height() * canvasScaleY);
    481     scaledWidth = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledWidth);
    482     scaledHeight = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledHeight);
    483 
    484     if (scaledWidth <= 0 || scaledHeight <= 0) {
    485         return 0;
    486     }
    487 
    488     mStagingProperties.setScaledSize(scaledWidth, scaledHeight);
    489     int saveCount = outCanvas->save(SaveFlags::MatrixClip);
    490     outCanvas->translate(bounds.fLeft, bounds.fTop);
    491 
    492     // Handle RTL mirroring.
    493     if (needsMirroring) {
    494         outCanvas->translate(bounds.width(), 0);
    495         outCanvas->scale(-1.0f, 1.0f);
    496     }
    497     mStagingProperties.setColorFilter(colorFilter);
    498 
    499     // At this point, canvas has been translated to the right position.
    500     // And we use this bound for the destination rect for the drawBitmap, so
    501     // we offset to (0, 0);
    502     SkRect tmpBounds = bounds;
    503     tmpBounds.offsetTo(0, 0);
    504     mStagingProperties.setBounds(tmpBounds);
    505     outCanvas->drawVectorDrawable(this);
    506     outCanvas->restoreToCount(saveCount);
    507     return scaledWidth * scaledHeight;
    508 }
    509 
    510 void Tree::drawStaging(Canvas* outCanvas) {
    511     bool redrawNeeded = allocateBitmapIfNeeded(&mStagingCache.bitmap,
    512             mStagingProperties.getScaledWidth(), mStagingProperties.getScaledHeight());
    513     // draw bitmap cache
    514     if (redrawNeeded || mStagingCache.dirty) {
    515         updateBitmapCache(&mStagingCache.bitmap, true);
    516         mStagingCache.dirty = false;
    517     }
    518 
    519     SkPaint tmpPaint;
    520     SkPaint* paint = updatePaint(&tmpPaint, &mStagingProperties);
    521     outCanvas->drawBitmap(mStagingCache.bitmap, 0, 0,
    522             mStagingCache.bitmap.width(), mStagingCache.bitmap.height(),
    523             mStagingProperties.getBounds().left(), mStagingProperties.getBounds().top(),
    524             mStagingProperties.getBounds().right(), mStagingProperties.getBounds().bottom(), paint);
    525 }
    526 
    527 SkPaint* Tree::getPaint() {
    528     return updatePaint(&mPaint, &mProperties);
    529 }
    530 
    531 // Update the given paint with alpha and color filter. Return nullptr if no color filter is
    532 // specified and root alpha is 1. Otherwise, return updated paint.
    533 SkPaint* Tree::updatePaint(SkPaint* outPaint, TreeProperties* prop) {
    534     if (prop->getRootAlpha() == 1.0f && prop->getColorFilter() == nullptr) {
    535         return nullptr;
    536     } else {
    537         outPaint->setColorFilter(prop->getColorFilter());
    538         outPaint->setFilterQuality(kLow_SkFilterQuality);
    539         outPaint->setAlpha(prop->getRootAlpha() * 255);
    540         return outPaint;
    541     }
    542 }
    543 
    544 const SkBitmap& Tree::getBitmapUpdateIfDirty() {
    545     bool redrawNeeded = allocateBitmapIfNeeded(&mCache.bitmap, mProperties.getScaledWidth(),
    546             mProperties.getScaledHeight());
    547     if (redrawNeeded || mCache.dirty) {
    548         updateBitmapCache(&mCache.bitmap, false);
    549         mCache.dirty = false;
    550     }
    551     return mCache.bitmap;
    552 }
    553 
    554 void Tree::updateBitmapCache(SkBitmap* outCache, bool useStagingData) {
    555     outCache->eraseColor(SK_ColorTRANSPARENT);
    556     SkCanvas outCanvas(*outCache);
    557     float viewportWidth = useStagingData ?
    558             mStagingProperties.getViewportWidth() : mProperties.getViewportWidth();
    559     float viewportHeight = useStagingData ?
    560             mStagingProperties.getViewportHeight() : mProperties.getViewportHeight();
    561     float scaleX = outCache->width() / viewportWidth;
    562     float scaleY = outCache->height() / viewportHeight;
    563     mRootNode->draw(&outCanvas, SkMatrix::I(), scaleX, scaleY, useStagingData);
    564 }
    565 
    566 bool Tree::allocateBitmapIfNeeded(SkBitmap* outCache, int width, int height) {
    567     if (!canReuseBitmap(*outCache, width, height)) {
    568         SkImageInfo info = SkImageInfo::Make(width, height,
    569                 kN32_SkColorType, kPremul_SkAlphaType);
    570         outCache->setInfo(info);
    571         // TODO: Count the bitmap cache against app's java heap
    572         outCache->allocPixels(info);
    573         return true;
    574     }
    575     return false;
    576 }
    577 
    578 bool Tree::canReuseBitmap(const SkBitmap& bitmap, int width, int height) {
    579     return width == bitmap.width() && height == bitmap.height();
    580 }
    581 
    582 void Tree::onPropertyChanged(TreeProperties* prop) {
    583     if (prop == &mStagingProperties) {
    584         mStagingCache.dirty = true;
    585     } else {
    586         mCache.dirty = true;
    587     }
    588 }
    589 
    590 }; // namespace VectorDrawable
    591 
    592 }; // namespace uirenderer
    593 }; // namespace android
    594