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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 <utils/Log.h>
     20 #include "PathParser.h"
     21 #include "SkColorFilter.h"
     22 #include "SkImageInfo.h"
     23 #include "SkShader.h"
     24 #include "utils/Macros.h"
     25 #include "utils/TraceUtils.h"
     26 #include "utils/VectorDrawableUtils.h"
     27 
     28 #include <math.h>
     29 #include <string.h>
     30 
     31 namespace android {
     32 namespace uirenderer {
     33 namespace VectorDrawable {
     34 
     35 const int Tree::MAX_CACHED_BITMAP_SIZE = 2048;
     36 
     37 void Path::dump() {
     38     ALOGD("Path: %s has %zu points", mName.c_str(), mProperties.getData().points.size());
     39 }
     40 
     41 // Called from UI thread during the initial setup/theme change.
     42 Path::Path(const char* pathStr, size_t strLength) {
     43     PathParser::ParseResult result;
     44     Data data;
     45     PathParser::getPathDataFromAsciiString(&data, &result, pathStr, strLength);
     46     mStagingProperties.setData(data);
     47 }
     48 
     49 Path::Path(const Path& path) : Node(path) {
     50     mStagingProperties.syncProperties(path.mStagingProperties);
     51 }
     52 
     53 const SkPath& Path::getUpdatedPath(bool useStagingData, SkPath* tempStagingPath) {
     54     if (useStagingData) {
     55         tempStagingPath->reset();
     56         VectorDrawableUtils::verbsToPath(tempStagingPath, mStagingProperties.getData());
     57         return *tempStagingPath;
     58     } else {
     59         if (mSkPathDirty) {
     60             mSkPath.reset();
     61             VectorDrawableUtils::verbsToPath(&mSkPath, mProperties.getData());
     62             mSkPathDirty = false;
     63         }
     64         return mSkPath;
     65     }
     66 }
     67 
     68 void Path::syncProperties() {
     69     if (mStagingPropertiesDirty) {
     70         mProperties.syncProperties(mStagingProperties);
     71     } else {
     72         mStagingProperties.syncProperties(mProperties);
     73     }
     74     mStagingPropertiesDirty = false;
     75 }
     76 
     77 FullPath::FullPath(const FullPath& path) : Path(path) {
     78     mStagingProperties.syncProperties(path.mStagingProperties);
     79 }
     80 
     81 static void applyTrim(SkPath* outPath, const SkPath& inPath, float trimPathStart, float trimPathEnd,
     82                       float trimPathOffset) {
     83     if (trimPathStart == 0.0f && trimPathEnd == 1.0f) {
     84         *outPath = inPath;
     85         return;
     86     }
     87     outPath->reset();
     88     if (trimPathStart == trimPathEnd) {
     89         // Trimmed path should be empty.
     90         return;
     91     }
     92     SkPathMeasure measure(inPath, false);
     93     float len = SkScalarToFloat(measure.getLength());
     94     float start = len * fmod((trimPathStart + trimPathOffset), 1.0f);
     95     float end = len * fmod((trimPathEnd + trimPathOffset), 1.0f);
     96 
     97     if (start > end) {
     98         measure.getSegment(start, len, outPath, true);
     99         if (end > 0) {
    100             measure.getSegment(0, end, outPath, true);
    101         }
    102     } else {
    103         measure.getSegment(start, end, outPath, true);
    104     }
    105 }
    106 
    107 const SkPath& FullPath::getUpdatedPath(bool useStagingData, SkPath* tempStagingPath) {
    108     if (!useStagingData && !mSkPathDirty && !mProperties.mTrimDirty) {
    109         return mTrimmedSkPath;
    110     }
    111     Path::getUpdatedPath(useStagingData, tempStagingPath);
    112     SkPath* outPath;
    113     if (useStagingData) {
    114         SkPath inPath = *tempStagingPath;
    115         applyTrim(tempStagingPath, inPath, mStagingProperties.getTrimPathStart(),
    116                   mStagingProperties.getTrimPathEnd(), mStagingProperties.getTrimPathOffset());
    117         outPath = tempStagingPath;
    118     } else {
    119         if (mProperties.getTrimPathStart() != 0.0f || mProperties.getTrimPathEnd() != 1.0f) {
    120             mProperties.mTrimDirty = false;
    121             applyTrim(&mTrimmedSkPath, mSkPath, mProperties.getTrimPathStart(),
    122                       mProperties.getTrimPathEnd(), mProperties.getTrimPathOffset());
    123             outPath = &mTrimmedSkPath;
    124         } else {
    125             outPath = &mSkPath;
    126         }
    127     }
    128     const FullPathProperties& properties = useStagingData ? mStagingProperties : mProperties;
    129     bool setFillPath = properties.getFillGradient() != nullptr ||
    130                        properties.getFillColor() != SK_ColorTRANSPARENT;
    131     if (setFillPath) {
    132         SkPath::FillType ft = static_cast<SkPath::FillType>(properties.getFillType());
    133         outPath->setFillType(ft);
    134     }
    135     return *outPath;
    136 }
    137 
    138 void FullPath::dump() {
    139     Path::dump();
    140     ALOGD("stroke width, color, alpha: %f, %d, %f, fill color, alpha: %d, %f",
    141           mProperties.getStrokeWidth(), mProperties.getStrokeColor(), mProperties.getStrokeAlpha(),
    142           mProperties.getFillColor(), mProperties.getFillAlpha());
    143 }
    144 
    145 inline SkColor applyAlpha(SkColor color, float alpha) {
    146     int alphaBytes = SkColorGetA(color);
    147     return SkColorSetA(color, alphaBytes * alpha);
    148 }
    149 
    150 void FullPath::draw(SkCanvas* outCanvas, bool useStagingData) {
    151     const FullPathProperties& properties = useStagingData ? mStagingProperties : mProperties;
    152     SkPath tempStagingPath;
    153     const SkPath& renderPath = getUpdatedPath(useStagingData, &tempStagingPath);
    154 
    155     // Draw path's fill, if fill color or gradient is valid
    156     bool needsFill = false;
    157     SkPaint paint;
    158     if (properties.getFillGradient() != nullptr) {
    159         paint.setColor(applyAlpha(SK_ColorBLACK, properties.getFillAlpha()));
    160         paint.setShader(sk_sp<SkShader>(SkSafeRef(properties.getFillGradient())));
    161         needsFill = true;
    162     } else if (properties.getFillColor() != SK_ColorTRANSPARENT) {
    163         paint.setColor(applyAlpha(properties.getFillColor(), properties.getFillAlpha()));
    164         needsFill = true;
    165     }
    166 
    167     if (needsFill) {
    168         paint.setStyle(SkPaint::Style::kFill_Style);
    169         paint.setAntiAlias(mAntiAlias);
    170         outCanvas->drawPath(renderPath, paint);
    171     }
    172 
    173     // Draw path's stroke, if stroke color or Gradient is valid
    174     bool needsStroke = false;
    175     if (properties.getStrokeGradient() != nullptr) {
    176         paint.setColor(applyAlpha(SK_ColorBLACK, properties.getStrokeAlpha()));
    177         paint.setShader(sk_sp<SkShader>(SkSafeRef(properties.getStrokeGradient())));
    178         needsStroke = true;
    179     } else if (properties.getStrokeColor() != SK_ColorTRANSPARENT) {
    180         paint.setColor(applyAlpha(properties.getStrokeColor(), properties.getStrokeAlpha()));
    181         needsStroke = true;
    182     }
    183     if (needsStroke) {
    184         paint.setStyle(SkPaint::Style::kStroke_Style);
    185         paint.setAntiAlias(mAntiAlias);
    186         paint.setStrokeJoin(SkPaint::Join(properties.getStrokeLineJoin()));
    187         paint.setStrokeCap(SkPaint::Cap(properties.getStrokeLineCap()));
    188         paint.setStrokeMiter(properties.getStrokeMiterLimit());
    189         paint.setStrokeWidth(properties.getStrokeWidth());
    190         outCanvas->drawPath(renderPath, paint);
    191     }
    192 }
    193 
    194 void FullPath::syncProperties() {
    195     Path::syncProperties();
    196 
    197     if (mStagingPropertiesDirty) {
    198         mProperties.syncProperties(mStagingProperties);
    199     } else {
    200         // Update staging property with property values from animation.
    201         mStagingProperties.syncProperties(mProperties);
    202     }
    203     mStagingPropertiesDirty = false;
    204 }
    205 
    206 REQUIRE_COMPATIBLE_LAYOUT(FullPath::FullPathProperties::PrimitiveFields);
    207 
    208 static_assert(sizeof(float) == sizeof(int32_t), "float is not the same size as int32_t");
    209 static_assert(sizeof(SkColor) == sizeof(int32_t), "SkColor is not the same size as int32_t");
    210 
    211 bool FullPath::FullPathProperties::copyProperties(int8_t* outProperties, int length) const {
    212     int propertyDataSize = sizeof(FullPathProperties::PrimitiveFields);
    213     if (length != propertyDataSize) {
    214         LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
    215                          propertyDataSize, length);
    216         return false;
    217     }
    218 
    219     PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
    220     *out = mPrimitiveFields;
    221     return true;
    222 }
    223 
    224 void FullPath::FullPathProperties::setColorPropertyValue(int propertyId, int32_t value) {
    225     Property currentProperty = static_cast<Property>(propertyId);
    226     if (currentProperty == Property::strokeColor) {
    227         setStrokeColor(value);
    228     } else if (currentProperty == Property::fillColor) {
    229         setFillColor(value);
    230     } else {
    231         LOG_ALWAYS_FATAL(
    232                 "Error setting color property on FullPath: No valid property"
    233                 " with id: %d",
    234                 propertyId);
    235     }
    236 }
    237 
    238 void FullPath::FullPathProperties::setPropertyValue(int propertyId, float value) {
    239     Property property = static_cast<Property>(propertyId);
    240     switch (property) {
    241         case Property::strokeWidth:
    242             setStrokeWidth(value);
    243             break;
    244         case Property::strokeAlpha:
    245             setStrokeAlpha(value);
    246             break;
    247         case Property::fillAlpha:
    248             setFillAlpha(value);
    249             break;
    250         case Property::trimPathStart:
    251             setTrimPathStart(value);
    252             break;
    253         case Property::trimPathEnd:
    254             setTrimPathEnd(value);
    255             break;
    256         case Property::trimPathOffset:
    257             setTrimPathOffset(value);
    258             break;
    259         default:
    260             LOG_ALWAYS_FATAL("Invalid property id: %d for animation", propertyId);
    261             break;
    262     }
    263 }
    264 
    265 void ClipPath::draw(SkCanvas* outCanvas, bool useStagingData) {
    266     SkPath tempStagingPath;
    267     outCanvas->clipPath(getUpdatedPath(useStagingData, &tempStagingPath));
    268 }
    269 
    270 Group::Group(const Group& group) : Node(group) {
    271     mStagingProperties.syncProperties(group.mStagingProperties);
    272 }
    273 
    274 void Group::draw(SkCanvas* outCanvas, bool useStagingData) {
    275     // Save the current clip and matrix information, which is local to this group.
    276     SkAutoCanvasRestore saver(outCanvas, true);
    277     // apply the current group's matrix to the canvas
    278     SkMatrix stackedMatrix;
    279     const GroupProperties& prop = useStagingData ? mStagingProperties : mProperties;
    280     getLocalMatrix(&stackedMatrix, prop);
    281     outCanvas->concat(stackedMatrix);
    282     // Draw the group tree in the same order as the XML file.
    283     for (auto& child : mChildren) {
    284         child->draw(outCanvas, useStagingData);
    285     }
    286     // Restore the previous clip and matrix information.
    287 }
    288 
    289 void Group::dump() {
    290     ALOGD("Group %s has %zu children: ", mName.c_str(), mChildren.size());
    291     ALOGD("Group translateX, Y : %f, %f, scaleX, Y: %f, %f", mProperties.getTranslateX(),
    292           mProperties.getTranslateY(), mProperties.getScaleX(), mProperties.getScaleY());
    293     for (size_t i = 0; i < mChildren.size(); i++) {
    294         mChildren[i]->dump();
    295     }
    296 }
    297 
    298 void Group::syncProperties() {
    299     // Copy over the dirty staging properties
    300     if (mStagingPropertiesDirty) {
    301         mProperties.syncProperties(mStagingProperties);
    302     } else {
    303         mStagingProperties.syncProperties(mProperties);
    304     }
    305     mStagingPropertiesDirty = false;
    306     for (auto& child : mChildren) {
    307         child->syncProperties();
    308     }
    309 }
    310 
    311 void Group::getLocalMatrix(SkMatrix* outMatrix, const GroupProperties& properties) {
    312     outMatrix->reset();
    313     // TODO: use rotate(mRotate, mPivotX, mPivotY) and scale with pivot point, instead of
    314     // translating to pivot for rotating and scaling, then translating back.
    315     outMatrix->postTranslate(-properties.getPivotX(), -properties.getPivotY());
    316     outMatrix->postScale(properties.getScaleX(), properties.getScaleY());
    317     outMatrix->postRotate(properties.getRotation(), 0, 0);
    318     outMatrix->postTranslate(properties.getTranslateX() + properties.getPivotX(),
    319                              properties.getTranslateY() + properties.getPivotY());
    320 }
    321 
    322 void Group::addChild(Node* child) {
    323     mChildren.emplace_back(child);
    324     if (mPropertyChangedListener != nullptr) {
    325         child->setPropertyChangedListener(mPropertyChangedListener);
    326     }
    327 }
    328 
    329 bool Group::GroupProperties::copyProperties(float* outProperties, int length) const {
    330     int propertyCount = static_cast<int>(Property::count);
    331     if (length != propertyCount) {
    332         LOG_ALWAYS_FATAL("Properties needs exactly %d bytes, a byte array of size %d is provided",
    333                          propertyCount, length);
    334         return false;
    335     }
    336 
    337     PrimitiveFields* out = reinterpret_cast<PrimitiveFields*>(outProperties);
    338     *out = mPrimitiveFields;
    339     return true;
    340 }
    341 
    342 // TODO: Consider animating the properties as float pointers
    343 // Called on render thread
    344 float Group::GroupProperties::getPropertyValue(int propertyId) const {
    345     Property currentProperty = static_cast<Property>(propertyId);
    346     switch (currentProperty) {
    347         case Property::rotate:
    348             return getRotation();
    349         case Property::pivotX:
    350             return getPivotX();
    351         case Property::pivotY:
    352             return getPivotY();
    353         case Property::scaleX:
    354             return getScaleX();
    355         case Property::scaleY:
    356             return getScaleY();
    357         case Property::translateX:
    358             return getTranslateX();
    359         case Property::translateY:
    360             return getTranslateY();
    361         default:
    362             LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
    363             return 0;
    364     }
    365 }
    366 
    367 // Called on render thread
    368 void Group::GroupProperties::setPropertyValue(int propertyId, float value) {
    369     Property currentProperty = static_cast<Property>(propertyId);
    370     switch (currentProperty) {
    371         case Property::rotate:
    372             setRotation(value);
    373             break;
    374         case Property::pivotX:
    375             setPivotX(value);
    376             break;
    377         case Property::pivotY:
    378             setPivotY(value);
    379             break;
    380         case Property::scaleX:
    381             setScaleX(value);
    382             break;
    383         case Property::scaleY:
    384             setScaleY(value);
    385             break;
    386         case Property::translateX:
    387             setTranslateX(value);
    388             break;
    389         case Property::translateY:
    390             setTranslateY(value);
    391             break;
    392         default:
    393             LOG_ALWAYS_FATAL("Invalid property index: %d", propertyId);
    394     }
    395 }
    396 
    397 bool Group::isValidProperty(int propertyId) {
    398     return GroupProperties::isValidProperty(propertyId);
    399 }
    400 
    401 bool Group::GroupProperties::isValidProperty(int propertyId) {
    402     return propertyId >= 0 && propertyId < static_cast<int>(Property::count);
    403 }
    404 
    405 int Tree::draw(Canvas* outCanvas, SkColorFilter* colorFilter, const SkRect& bounds,
    406                bool needsMirroring, bool canReuseCache) {
    407     // The imageView can scale the canvas in different ways, in order to
    408     // avoid blurry scaling, we have to draw into a bitmap with exact pixel
    409     // size first. This bitmap size is determined by the bounds and the
    410     // canvas scale.
    411     SkMatrix canvasMatrix;
    412     outCanvas->getMatrix(&canvasMatrix);
    413     float canvasScaleX = 1.0f;
    414     float canvasScaleY = 1.0f;
    415     if (canvasMatrix.getSkewX() == 0 && canvasMatrix.getSkewY() == 0) {
    416         // Only use the scale value when there's no skew or rotation in the canvas matrix.
    417         // TODO: Add a cts test for drawing VD on a canvas with negative scaling factors.
    418         canvasScaleX = fabs(canvasMatrix.getScaleX());
    419         canvasScaleY = fabs(canvasMatrix.getScaleY());
    420     }
    421     int scaledWidth = (int)(bounds.width() * canvasScaleX);
    422     int scaledHeight = (int)(bounds.height() * canvasScaleY);
    423     scaledWidth = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledWidth);
    424     scaledHeight = std::min(Tree::MAX_CACHED_BITMAP_SIZE, scaledHeight);
    425 
    426     if (scaledWidth <= 0 || scaledHeight <= 0) {
    427         return 0;
    428     }
    429 
    430     mStagingProperties.setScaledSize(scaledWidth, scaledHeight);
    431     int saveCount = outCanvas->save(SaveFlags::MatrixClip);
    432     outCanvas->translate(bounds.fLeft, bounds.fTop);
    433 
    434     // Handle RTL mirroring.
    435     if (needsMirroring) {
    436         outCanvas->translate(bounds.width(), 0);
    437         outCanvas->scale(-1.0f, 1.0f);
    438     }
    439     mStagingProperties.setColorFilter(colorFilter);
    440 
    441     // At this point, canvas has been translated to the right position.
    442     // And we use this bound for the destination rect for the drawBitmap, so
    443     // we offset to (0, 0);
    444     SkRect tmpBounds = bounds;
    445     tmpBounds.offsetTo(0, 0);
    446     mStagingProperties.setBounds(tmpBounds);
    447     outCanvas->drawVectorDrawable(this);
    448     outCanvas->restoreToCount(saveCount);
    449     return scaledWidth * scaledHeight;
    450 }
    451 
    452 void Tree::drawStaging(Canvas* outCanvas) {
    453     bool redrawNeeded = allocateBitmapIfNeeded(mStagingCache, mStagingProperties.getScaledWidth(),
    454                                                mStagingProperties.getScaledHeight());
    455     // draw bitmap cache
    456     if (redrawNeeded || mStagingCache.dirty) {
    457         updateBitmapCache(*mStagingCache.bitmap, true);
    458         mStagingCache.dirty = false;
    459     }
    460 
    461     SkPaint paint;
    462     getPaintFor(&paint, mStagingProperties);
    463     outCanvas->drawBitmap(*mStagingCache.bitmap, 0, 0, mStagingCache.bitmap->width(),
    464                           mStagingCache.bitmap->height(), mStagingProperties.getBounds().left(),
    465                           mStagingProperties.getBounds().top(),
    466                           mStagingProperties.getBounds().right(),
    467                           mStagingProperties.getBounds().bottom(), &paint);
    468 }
    469 
    470 void Tree::getPaintFor(SkPaint* outPaint, const TreeProperties &prop) const {
    471     // HWUI always draws VD with bilinear filtering.
    472     outPaint->setFilterQuality(kLow_SkFilterQuality);
    473     if (prop.getColorFilter() != nullptr) {
    474         outPaint->setColorFilter(sk_ref_sp(prop.getColorFilter()));
    475     }
    476     outPaint->setAlpha(prop.getRootAlpha() * 255);
    477 }
    478 
    479 Bitmap& Tree::getBitmapUpdateIfDirty() {
    480     bool redrawNeeded = allocateBitmapIfNeeded(mCache, mProperties.getScaledWidth(),
    481                                                mProperties.getScaledHeight());
    482     if (redrawNeeded || mCache.dirty) {
    483         updateBitmapCache(*mCache.bitmap, false);
    484         mCache.dirty = false;
    485     }
    486     return *mCache.bitmap;
    487 }
    488 
    489 void Tree::updateCache(sp<skiapipeline::VectorDrawableAtlas>& atlas, GrContext* context) {
    490     SkRect dst;
    491     sk_sp<SkSurface> surface = mCache.getSurface(&dst);
    492     bool canReuseSurface = surface && dst.width() >= mProperties.getScaledWidth() &&
    493                            dst.height() >= mProperties.getScaledHeight();
    494     if (!canReuseSurface) {
    495         int scaledWidth = SkScalarCeilToInt(mProperties.getScaledWidth());
    496         int scaledHeight = SkScalarCeilToInt(mProperties.getScaledHeight());
    497         auto atlasEntry = atlas->requestNewEntry(scaledWidth, scaledHeight, context);
    498         if (INVALID_ATLAS_KEY != atlasEntry.key) {
    499             dst = atlasEntry.rect;
    500             surface = atlasEntry.surface;
    501             mCache.setAtlas(atlas, atlasEntry.key);
    502         } else {
    503             // don't draw, if we failed to allocate an offscreen buffer
    504             mCache.clear();
    505             surface.reset();
    506         }
    507     }
    508     if (!canReuseSurface || mCache.dirty) {
    509         if (surface) {
    510             Bitmap& bitmap = getBitmapUpdateIfDirty();
    511             SkBitmap skiaBitmap;
    512             bitmap.getSkBitmap(&skiaBitmap);
    513             surface->writePixels(skiaBitmap, dst.fLeft, dst.fTop);
    514         }
    515         mCache.dirty = false;
    516     }
    517 }
    518 
    519 void Tree::Cache::setAtlas(sp<skiapipeline::VectorDrawableAtlas> newAtlas,
    520                            skiapipeline::AtlasKey newAtlasKey) {
    521     LOG_ALWAYS_FATAL_IF(newAtlasKey == INVALID_ATLAS_KEY);
    522     clear();
    523     mAtlas = newAtlas;
    524     mAtlasKey = newAtlasKey;
    525 }
    526 
    527 sk_sp<SkSurface> Tree::Cache::getSurface(SkRect* bounds) {
    528     sk_sp<SkSurface> surface;
    529     sp<skiapipeline::VectorDrawableAtlas> atlas = mAtlas.promote();
    530     if (atlas.get() && mAtlasKey != INVALID_ATLAS_KEY) {
    531         auto atlasEntry = atlas->getEntry(mAtlasKey);
    532         *bounds = atlasEntry.rect;
    533         surface = atlasEntry.surface;
    534         mAtlasKey = atlasEntry.key;
    535     }
    536 
    537     return surface;
    538 }
    539 
    540 void Tree::Cache::clear() {
    541     sp<skiapipeline::VectorDrawableAtlas> lockAtlas = mAtlas.promote();
    542     if (lockAtlas.get()) {
    543         lockAtlas->releaseEntry(mAtlasKey);
    544     }
    545     mAtlas = nullptr;
    546     mAtlasKey = INVALID_ATLAS_KEY;
    547 }
    548 
    549 void Tree::draw(SkCanvas* canvas, const SkRect& bounds, const SkPaint& inPaint) {
    550     if (canvas->quickReject(bounds)) {
    551         // The RenderNode is on screen, but the AVD is not.
    552         return;
    553     }
    554 
    555     // Update the paint for any animatable properties
    556     SkPaint paint = inPaint;
    557     paint.setAlpha(mProperties.getRootAlpha() * 255);
    558 
    559     if (canvas->getGrContext() == nullptr) {
    560         // Recording to picture, don't use the SkSurface which won't work off of renderthread.
    561         Bitmap& bitmap = getBitmapUpdateIfDirty();
    562         SkBitmap skiaBitmap;
    563         bitmap.getSkBitmap(&skiaBitmap);
    564 
    565         int scaledWidth = SkScalarCeilToInt(mProperties.getScaledWidth());
    566         int scaledHeight = SkScalarCeilToInt(mProperties.getScaledHeight());
    567         canvas->drawBitmapRect(skiaBitmap, SkRect::MakeWH(scaledWidth, scaledHeight), bounds,
    568                                &paint, SkCanvas::kFast_SrcRectConstraint);
    569         return;
    570     }
    571 
    572     SkRect src;
    573     sk_sp<SkSurface> vdSurface = mCache.getSurface(&src);
    574     if (vdSurface) {
    575         canvas->drawImageRect(vdSurface->makeImageSnapshot().get(), src, bounds, &paint,
    576                               SkCanvas::kFast_SrcRectConstraint);
    577     } else {
    578         // Handle the case when VectorDrawableAtlas has been destroyed, because of memory pressure.
    579         // We render the VD into a temporary standalone buffer and mark the frame as dirty. Next
    580         // frame will be cached into the atlas.
    581         Bitmap& bitmap = getBitmapUpdateIfDirty();
    582         SkBitmap skiaBitmap;
    583         bitmap.getSkBitmap(&skiaBitmap);
    584 
    585         int scaledWidth = SkScalarCeilToInt(mProperties.getScaledWidth());
    586         int scaledHeight = SkScalarCeilToInt(mProperties.getScaledHeight());
    587         canvas->drawBitmapRect(skiaBitmap, SkRect::MakeWH(scaledWidth, scaledHeight), bounds,
    588                                &paint, SkCanvas::kFast_SrcRectConstraint);
    589         mCache.clear();
    590         markDirty();
    591     }
    592 }
    593 
    594 void Tree::updateBitmapCache(Bitmap& bitmap, bool useStagingData) {
    595     SkBitmap outCache;
    596     bitmap.getSkBitmap(&outCache);
    597     int cacheWidth = outCache.width();
    598     int cacheHeight = outCache.height();
    599     ATRACE_FORMAT("VectorDrawable repaint %dx%d", cacheWidth, cacheHeight);
    600     outCache.eraseColor(SK_ColorTRANSPARENT);
    601     SkCanvas outCanvas(outCache);
    602     float viewportWidth =
    603             useStagingData ? mStagingProperties.getViewportWidth() : mProperties.getViewportWidth();
    604     float viewportHeight = useStagingData ? mStagingProperties.getViewportHeight()
    605                                           : mProperties.getViewportHeight();
    606     float scaleX = cacheWidth / viewportWidth;
    607     float scaleY = cacheHeight / viewportHeight;
    608     outCanvas.scale(scaleX, scaleY);
    609     mRootNode->draw(&outCanvas, useStagingData);
    610 }
    611 
    612 bool Tree::allocateBitmapIfNeeded(Cache& cache, int width, int height) {
    613     if (!canReuseBitmap(cache.bitmap.get(), width, height)) {
    614         SkImageInfo info = SkImageInfo::MakeN32(width, height, kPremul_SkAlphaType);
    615         cache.bitmap = Bitmap::allocateHeapBitmap(info);
    616         return true;
    617     }
    618     return false;
    619 }
    620 
    621 bool Tree::canReuseBitmap(Bitmap* bitmap, int width, int height) {
    622     return bitmap && width <= bitmap->width() && height <= bitmap->height();
    623 }
    624 
    625 void Tree::onPropertyChanged(TreeProperties* prop) {
    626     if (prop == &mStagingProperties) {
    627         mStagingCache.dirty = true;
    628     } else {
    629         mCache.dirty = true;
    630     }
    631 }
    632 
    633 class MinMaxAverage {
    634 public:
    635     void add(float sample) {
    636         if (mCount == 0) {
    637             mMin = sample;
    638             mMax = sample;
    639         } else {
    640             mMin = std::min(mMin, sample);
    641             mMax = std::max(mMax, sample);
    642         }
    643         mTotal += sample;
    644         mCount++;
    645     }
    646 
    647     float average() { return mTotal / mCount; }
    648 
    649     float min() { return mMin; }
    650 
    651     float max() { return mMax; }
    652 
    653     float delta() { return mMax - mMin; }
    654 
    655 private:
    656     float mMin = 0.0f;
    657     float mMax = 0.0f;
    658     float mTotal = 0.0f;
    659     int mCount = 0;
    660 };
    661 
    662 BitmapPalette Tree::computePalette() {
    663     // TODO Cache this and share the code with Bitmap.cpp
    664 
    665     ATRACE_CALL();
    666 
    667     // TODO: This calculation of converting to HSV & tracking min/max is probably overkill
    668     // Experiment with something simpler since we just want to figure out if it's "color-ful"
    669     // and then the average perceptual lightness.
    670 
    671     MinMaxAverage hue, saturation, value;
    672     int sampledCount = 0;
    673 
    674     // Sample a grid of 100 pixels to get an overall estimation of the colors in play
    675     mRootNode->forEachFillColor([&](SkColor color) {
    676         if (SkColorGetA(color) < 75) {
    677             return;
    678         }
    679         sampledCount++;
    680         float hsv[3];
    681         SkColorToHSV(color, hsv);
    682         hue.add(hsv[0]);
    683         saturation.add(hsv[1]);
    684         value.add(hsv[2]);
    685     });
    686 
    687     if (sampledCount == 0) {
    688         ALOGV("VectorDrawable is mostly translucent");
    689         return BitmapPalette::Unknown;
    690     }
    691 
    692     ALOGV("samples = %d, hue [min = %f, max = %f, avg = %f]; saturation [min = %f, max = %f, avg = "
    693           "%f]; value [min = %f, max = %f, avg = %f]",
    694           sampledCount, hue.min(), hue.max(), hue.average(), saturation.min(), saturation.max(),
    695           saturation.average(), value.min(), value.max(), value.average());
    696 
    697     if (hue.delta() <= 20 && saturation.delta() <= .1f) {
    698         if (value.average() >= .5f) {
    699             return BitmapPalette::Light;
    700         } else {
    701             return BitmapPalette::Dark;
    702         }
    703     }
    704     return BitmapPalette::Unknown;
    705 }
    706 
    707 }  // namespace VectorDrawable
    708 
    709 }  // namespace uirenderer
    710 }  // namespace android
    711