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/*
* 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