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/*
* Copyright (C) 2014 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 "SkiaCanvas.h"
#include "CanvasProperty.h"
#include "NinePatchUtils.h"
#include "VectorDrawable.h"
#include "hwui/Bitmap.h"
#include "hwui/MinikinUtils.h"
#include "pipeline/skia/AnimatedDrawables.h"
#include <SkDrawable.h>
#include <SkDevice.h>
#include <SkDeque.h>
#include <SkDrawFilter.h>
#include <SkGraphics.h>
#include <SkImage.h>
#include <SkImagePriv.h>
#include <SkRSXform.h>
#include <SkShader.h>
#include <SkTemplates.h>
#include <SkTextBlob.h>
#include <memory>
namespace android {
using uirenderer::PaintUtils;
Canvas* Canvas::create_canvas(const SkBitmap& bitmap) {
return new SkiaCanvas(bitmap);
}
Canvas* Canvas::create_canvas(SkCanvas* skiaCanvas) {
return new SkiaCanvas(skiaCanvas);
}
SkiaCanvas::SkiaCanvas() {}
SkiaCanvas::SkiaCanvas(SkCanvas* canvas)
: mCanvas(SkRef(canvas)) {}
SkiaCanvas::SkiaCanvas(const SkBitmap& bitmap) {
mCanvas.reset(new SkCanvas(bitmap));
}
SkiaCanvas::~SkiaCanvas() {}
void SkiaCanvas::reset(SkCanvas* skiaCanvas) {
mCanvas.reset(SkRef(skiaCanvas));
mSaveStack.reset(nullptr);
mHighContrastText = false;
}
// ----------------------------------------------------------------------------
// Canvas state operations: Replace Bitmap
// ----------------------------------------------------------------------------
class ClipCopier : public SkCanvas::ClipVisitor {
public:
explicit ClipCopier(SkCanvas* dstCanvas) : m_dstCanvas(dstCanvas) {}
virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) {
m_dstCanvas->clipRect(rect, op, antialias);
}
virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) {
m_dstCanvas->clipRRect(rrect, op, antialias);
}
virtual void clipPath(const SkPath& path, SkRegion::Op op, bool antialias) {
m_dstCanvas->clipPath(path, op, antialias);
}
private:
SkCanvas* m_dstCanvas;
};
void SkiaCanvas::setBitmap(const SkBitmap& bitmap) {
SkCanvas* newCanvas = new SkCanvas(bitmap);
if (!bitmap.isNull()) {
// Copy the canvas matrix & clip state.
newCanvas->setMatrix(mCanvas->getTotalMatrix());
ClipCopier copier(newCanvas);
mCanvas->replayClips(&copier);
}
// unrefs the existing canvas
mCanvas.reset(newCanvas);
// clean up the old save stack
mSaveStack.reset(nullptr);
}
// ----------------------------------------------------------------------------
// Canvas state operations
// ----------------------------------------------------------------------------
bool SkiaCanvas::isOpaque() {
return mCanvas->imageInfo().isOpaque();
}
int SkiaCanvas::width() {
return mCanvas->imageInfo().width();
}
int SkiaCanvas::height() {
return mCanvas->imageInfo().height();
}
// ----------------------------------------------------------------------------
// Canvas state operations: Save (layer)
// ----------------------------------------------------------------------------
int SkiaCanvas::getSaveCount() const {
return mCanvas->getSaveCount();
}
int SkiaCanvas::save(SaveFlags::Flags flags) {
int count = mCanvas->save();
recordPartialSave(flags);
return count;
}
// The SkiaCanvas::restore operation layers on the capability to preserve
// either (or both) the matrix and/or clip state after a SkCanvas::restore
// operation. It does this by explicitly saving off the clip & matrix state
// when requested and playing it back after the SkCanvas::restore.
void SkiaCanvas::restore() {
const auto* rec = this->currentSaveRec();
if (!rec) {
// Fast path - no record for this frame.
mCanvas->restore();
return;
}
bool preserveMatrix = !(rec->saveFlags & SaveFlags::Matrix);
bool preserveClip = !(rec->saveFlags & SaveFlags::Clip);
SkMatrix savedMatrix;
if (preserveMatrix) {
savedMatrix = mCanvas->getTotalMatrix();
}
const size_t clipIndex = rec->clipIndex;
mCanvas->restore();
mSaveStack->pop_back();
if (preserveMatrix) {
mCanvas->setMatrix(savedMatrix);
}
if (preserveClip) {
this->applyPersistentClips(clipIndex);
}
}
void SkiaCanvas::restoreToCount(int restoreCount) {
while (mCanvas->getSaveCount() > restoreCount) {
this->restore();
}
}
static inline SkCanvas::SaveLayerFlags layerFlags(SaveFlags::Flags flags) {
SkCanvas::SaveLayerFlags layerFlags = 0;
// We intentionally ignore the SaveFlags::HasAlphaLayer and
// SkCanvas::kIsOpaque_SaveLayerFlag flags because HWUI ignores it
// and our Android client may use it incorrectly.
// In Skia, this flag is purely for performance optimization.
if (!(flags & SaveFlags::ClipToLayer)) {
layerFlags |= SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag;
}
return layerFlags;
}
int SkiaCanvas::saveLayer(float left, float top, float right, float bottom,
const SkPaint* paint, SaveFlags::Flags flags) {
const SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom);
const SkCanvas::SaveLayerRec rec(&bounds, paint, layerFlags(flags));
int count = mCanvas->saveLayer(rec);
recordPartialSave(flags);
return count;
}
int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom,
int alpha, SaveFlags::Flags flags) {
if (static_cast<unsigned>(alpha) < 0xFF) {
SkPaint alphaPaint;
alphaPaint.setAlpha(alpha);
return this->saveLayer(left, top, right, bottom, &alphaPaint, flags);
}
return this->saveLayer(left, top, right, bottom, nullptr, flags);
}
class SkiaCanvas::Clip {
public:
Clip(const SkRect& rect, SkRegion::Op op, const SkMatrix& m)
: mType(Type::Rect), mOp(op), mMatrix(m), mRRect(SkRRect::MakeRect(rect)) {}
Clip(const SkRRect& rrect, SkRegion::Op op, const SkMatrix& m)
: mType(Type::RRect), mOp(op), mMatrix(m), mRRect(rrect) {}
Clip(const SkPath& path, SkRegion::Op op, const SkMatrix& m)
: mType(Type::Path), mOp(op), mMatrix(m), mPath(&path) {}
void apply(SkCanvas* canvas) const {
canvas->setMatrix(mMatrix);
switch (mType) {
case Type::Rect:
canvas->clipRect(mRRect.rect(), mOp);
break;
case Type::RRect:
canvas->clipRRect(mRRect, mOp);
break;
case Type::Path:
canvas->clipPath(*mPath.get(), mOp);
break;
}
}
private:
enum class Type {
Rect,
RRect,
Path,
};
Type mType;
SkRegion::Op mOp;
SkMatrix mMatrix;
// These are logically a union (tracked separately due to non-POD path).
SkTLazy<SkPath> mPath;
SkRRect mRRect;
};
const SkiaCanvas::SaveRec* SkiaCanvas::currentSaveRec() const {
const SaveRec* rec = mSaveStack
? static_cast<const SaveRec*>(mSaveStack->back())
: nullptr;
int currentSaveCount = mCanvas->getSaveCount();
SkASSERT(!rec || currentSaveCount >= rec->saveCount);
return (rec && rec->saveCount == currentSaveCount) ? rec : nullptr;
}
// ----------------------------------------------------------------------------
// functions to emulate legacy SaveFlags (i.e. independent matrix/clip flags)
// ----------------------------------------------------------------------------
void SkiaCanvas::recordPartialSave(SaveFlags::Flags flags) {
// A partial save is a save operation which doesn't capture the full canvas state.
// (either SaveFlags::Matrix or SaveFlags::Clip is missing).
// Mask-out non canvas state bits.
flags &= SaveFlags::MatrixClip;
if (flags == SaveFlags::MatrixClip) {
// not a partial save.
return;
}
if (!mSaveStack) {
mSaveStack.reset(new SkDeque(sizeof(struct SaveRec), 8));
}
SaveRec* rec = static_cast<SaveRec*>(mSaveStack->push_back());
rec->saveCount = mCanvas->getSaveCount();
rec->saveFlags = flags;
rec->clipIndex = mClipStack.size();
}
template <typename T>
void SkiaCanvas::recordClip(const T& clip, SkRegion::Op op) {
// Only need tracking when in a partial save frame which
// doesn't restore the clip.
const SaveRec* rec = this->currentSaveRec();
if (rec && !(rec->saveFlags & SaveFlags::Clip)) {
mClipStack.emplace_back(clip, op, mCanvas->getTotalMatrix());
}
}
// Applies and optionally removes all clips >= index.
void SkiaCanvas::applyPersistentClips(size_t clipStartIndex) {
SkASSERT(clipStartIndex <= mClipStack.size());
const auto begin = mClipStack.cbegin() + clipStartIndex;
const auto end = mClipStack.cend();
// Clip application mutates the CTM.
const SkMatrix saveMatrix = mCanvas->getTotalMatrix();
for (auto clip = begin; clip != end; ++clip) {
clip->apply(mCanvas.get());
}
mCanvas->setMatrix(saveMatrix);
// If the current/post-restore save rec is also persisting clips, we
// leave them on the stack to be reapplied part of the next restore().
// Otherwise we're done and just pop them.
const auto* rec = this->currentSaveRec();
if (!rec || (rec->saveFlags & SaveFlags::Clip)) {
mClipStack.erase(begin, end);
}
}
// ----------------------------------------------------------------------------
// Canvas state operations: Matrix
// ----------------------------------------------------------------------------
void SkiaCanvas::getMatrix(SkMatrix* outMatrix) const {
*outMatrix = mCanvas->getTotalMatrix();
}
void SkiaCanvas::setMatrix(const SkMatrix& matrix) {
mCanvas->setMatrix(matrix);
}
void SkiaCanvas::concat(const SkMatrix& matrix) {
mCanvas->concat(matrix);
}
void SkiaCanvas::rotate(float degrees) {
mCanvas->rotate(degrees);
}
void SkiaCanvas::scale(float sx, float sy) {
mCanvas->scale(sx, sy);
}
void SkiaCanvas::skew(float sx, float sy) {
mCanvas->skew(sx, sy);
}
void SkiaCanvas::translate(float dx, float dy) {
mCanvas->translate(dx, dy);
}
// ----------------------------------------------------------------------------
// Canvas state operations: Clips
// ----------------------------------------------------------------------------
// This function is a mirror of SkCanvas::getClipBounds except that it does
// not outset the edge of the clip to account for anti-aliasing. There is
// a skia bug to investigate pushing this logic into back into skia.
// (see https://code.google.com/p/skia/issues/detail?id=1303)
bool SkiaCanvas::getClipBounds(SkRect* outRect) const {
SkIRect ibounds;
if (!mCanvas->getClipDeviceBounds(&ibounds)) {
return false;
}
SkMatrix inverse;
// if we can't invert the CTM, we can't return local clip bounds
if (!mCanvas->getTotalMatrix().invert(&inverse)) {
if (outRect) {
outRect->setEmpty();
}
return false;
}
if (NULL != outRect) {
SkRect r = SkRect::Make(ibounds);
inverse.mapRect(outRect, r);
}
return true;
}
bool SkiaCanvas::quickRejectRect(float left, float top, float right, float bottom) const {
SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom);
return mCanvas->quickReject(bounds);
}
bool SkiaCanvas::quickRejectPath(const SkPath& path) const {
return mCanvas->quickReject(path);
}
bool SkiaCanvas::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) {
SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
this->recordClip(rect, op);
mCanvas->clipRect(rect, op);
return !mCanvas->isClipEmpty();
}
bool SkiaCanvas::clipPath(const SkPath* path, SkRegion::Op op) {
SkRRect roundRect;
if (path->isRRect(&roundRect)) {
this->recordClip(roundRect, op);
mCanvas->clipRRect(roundRect, op);
} else {
this->recordClip(*path, op);
mCanvas->clipPath(*path, op);
}
return !mCanvas->isClipEmpty();
}
bool SkiaCanvas::clipRegion(const SkRegion* region, SkRegion::Op op) {
SkPath rgnPath;
if (region->getBoundaryPath(&rgnPath)) {
// The region is specified in device space.
SkMatrix savedMatrix = mCanvas->getTotalMatrix();
mCanvas->resetMatrix();
this->recordClip(rgnPath, op);
mCanvas->clipPath(rgnPath, op);
mCanvas->setMatrix(savedMatrix);
} else {
const auto emptyClip = SkRect::MakeEmpty();
this->recordClip(emptyClip, op);
mCanvas->clipRect(emptyClip, op);
}
return !mCanvas->isClipEmpty();
}
// ----------------------------------------------------------------------------
// Canvas state operations: Filters
// ----------------------------------------------------------------------------
SkDrawFilter* SkiaCanvas::getDrawFilter() {
return mCanvas->getDrawFilter();
}
void SkiaCanvas::setDrawFilter(SkDrawFilter* drawFilter) {
mCanvas->setDrawFilter(drawFilter);
}
// ----------------------------------------------------------------------------
// Canvas draw operations
// ----------------------------------------------------------------------------
void SkiaCanvas::drawColor(int color, SkBlendMode mode) {
mCanvas->drawColor(color, mode);
}
void SkiaCanvas::drawPaint(const SkPaint& paint) {
mCanvas->drawPaint(paint);
}
// ----------------------------------------------------------------------------
// Canvas draw operations: Geometry
// ----------------------------------------------------------------------------
void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint,
SkCanvas::PointMode mode) {
if (CC_UNLIKELY(count < 2 || PaintUtils::paintWillNotDraw(paint))) return;
// convert the floats into SkPoints
count >>= 1; // now it is the number of points
std::unique_ptr<SkPoint[]> pts(new SkPoint[count]);
for (int i = 0; i < count; i++) {
pts[i].set(points[0], points[1]);
points += 2;
}
mCanvas->drawPoints(mode, count, pts.get(), paint);
}
void SkiaCanvas::drawPoint(float x, float y, const SkPaint& paint) {
mCanvas->drawPoint(x, y, paint);
}
void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint) {
this->drawPoints(points, count, paint, SkCanvas::kPoints_PointMode);
}
void SkiaCanvas::drawLine(float startX, float startY, float stopX, float stopY,
const SkPaint& paint) {
mCanvas->drawLine(startX, startY, stopX, stopY, paint);
}
void SkiaCanvas::drawLines(const float* points, int count, const SkPaint& paint) {
if (CC_UNLIKELY(count < 4 || PaintUtils::paintWillNotDraw(paint))) return;
this->drawPoints(points, count, paint, SkCanvas::kLines_PointMode);
}
void SkiaCanvas::drawRect(float left, float top, float right, float bottom,
const SkPaint& paint) {
if (CC_UNLIKELY(PaintUtils::paintWillNotDraw(paint))) return;
mCanvas->drawRectCoords(left, top, right, bottom, paint);
}
void SkiaCanvas::drawRegion(const SkRegion& region, const SkPaint& paint) {
if (CC_UNLIKELY(PaintUtils::paintWillNotDraw(paint))) return;
mCanvas->drawRegion(region, paint);
}
void SkiaCanvas::drawRoundRect(float left, float top, float right, float bottom,
float rx, float ry, const SkPaint& paint) {
if (CC_UNLIKELY(PaintUtils::paintWillNotDraw(paint))) return;
SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
mCanvas->drawRoundRect(rect, rx, ry, paint);
}
void SkiaCanvas::drawCircle(float x, float y, float radius, const SkPaint& paint) {
if (CC_UNLIKELY(radius <= 0 || PaintUtils::paintWillNotDraw(paint))) return;
mCanvas->drawCircle(x, y, radius, paint);
}
void SkiaCanvas::drawOval(float left, float top, float right, float bottom, const SkPaint& paint) {
if (CC_UNLIKELY(PaintUtils::paintWillNotDraw(paint))) return;
SkRect oval = SkRect::MakeLTRB(left, top, right, bottom);
mCanvas->drawOval(oval, paint);
}
void SkiaCanvas::drawArc(float left, float top, float right, float bottom,
float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) {
if (CC_UNLIKELY(PaintUtils::paintWillNotDraw(paint))) return;
SkRect arc = SkRect::MakeLTRB(left, top, right, bottom);
mCanvas->drawArc(arc, startAngle, sweepAngle, useCenter, paint);
}
void SkiaCanvas::drawPath(const SkPath& path, const SkPaint& paint) {
if (CC_UNLIKELY(PaintUtils::paintWillNotDraw(paint))) return;
SkRect rect;
SkRRect roundRect;
if (path.isOval(&rect)) {
mCanvas->drawOval(rect, paint);
} else if (path.isRRect(&roundRect)) {
mCanvas->drawRRect(roundRect, paint);
} else {
mCanvas->drawPath(path, paint);
}
}
void SkiaCanvas::drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
const float* verts, const float* texs, const int* colors,
const uint16_t* indices, int indexCount, const SkPaint& paint) {
#ifndef SK_SCALAR_IS_FLOAT
SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid");
#endif
const int ptCount = vertexCount >> 1;
mCanvas->drawVertices(vertexMode, ptCount, (SkPoint*)verts, (SkPoint*)texs,
(SkColor*)colors, indices, indexCount, paint);
}
// ----------------------------------------------------------------------------
// Canvas draw operations: Bitmaps
// ----------------------------------------------------------------------------
void SkiaCanvas::drawBitmap(Bitmap& bitmap, float left, float top, const SkPaint* paint) {
SkBitmap skBitmap;
bitmap.getSkBitmap(&skBitmap);
mCanvas->drawBitmap(skBitmap, left, top, paint);
}
void SkiaCanvas::drawBitmap(Bitmap& hwuiBitmap, const SkMatrix& matrix, const SkPaint* paint) {
SkBitmap bitmap;
hwuiBitmap.getSkBitmap(&bitmap);
SkAutoCanvasRestore acr(mCanvas.get(), true);
mCanvas->concat(matrix);
mCanvas->drawBitmap(bitmap, 0, 0, paint);
}
void SkiaCanvas::drawBitmap(Bitmap& hwuiBitmap, float srcLeft, float srcTop,
float srcRight, float srcBottom, float dstLeft, float dstTop,
float dstRight, float dstBottom, const SkPaint* paint) {
SkBitmap bitmap;
hwuiBitmap.getSkBitmap(&bitmap);
SkRect srcRect = SkRect::MakeLTRB(srcLeft, srcTop, srcRight, srcBottom);
SkRect dstRect = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom);
mCanvas->drawBitmapRect(bitmap, srcRect, dstRect, paint);
}
void SkiaCanvas::drawBitmapMesh(Bitmap& hwuiBitmap, int meshWidth, int meshHeight,
const float* vertices, const int* colors, const SkPaint* paint) {
SkBitmap bitmap;
hwuiBitmap.getSkBitmap(&bitmap);
const int ptCount = (meshWidth + 1) * (meshHeight + 1);
const int indexCount = meshWidth * meshHeight * 6;
/* Our temp storage holds 2 or 3 arrays.
texture points [ptCount * sizeof(SkPoint)]
optionally vertex points [ptCount * sizeof(SkPoint)] if we need a
copy to convert from float to fixed
indices [ptCount * sizeof(uint16_t)]
*/
ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[]
storageSize += indexCount * sizeof(uint16_t); // indices[]
#ifndef SK_SCALAR_IS_FLOAT
SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid");
#endif
std::unique_ptr<char[]> storage(new char[storageSize]);
SkPoint* texs = (SkPoint*)storage.get();
uint16_t* indices = (uint16_t*)(texs + ptCount);
// cons up texture coordinates and indices
{
const SkScalar w = SkIntToScalar(bitmap.width());
const SkScalar h = SkIntToScalar(bitmap.height());
const SkScalar dx = w / meshWidth;
const SkScalar dy = h / meshHeight;
SkPoint* texsPtr = texs;
SkScalar y = 0;
for (int i = 0; i <= meshHeight; i++) {
if (i == meshHeight) {
y = h; // to ensure numerically we hit h exactly
}
SkScalar x = 0;
for (int j = 0; j < meshWidth; j++) {
texsPtr->set(x, y);
texsPtr += 1;
x += dx;
}
texsPtr->set(w, y);
texsPtr += 1;
y += dy;
}
SkASSERT(texsPtr - texs == ptCount);
}
// cons up indices
{
uint16_t* indexPtr = indices;
int index = 0;
for (int i = 0; i < meshHeight; i++) {
for (int j = 0; j < meshWidth; j++) {
// lower-left triangle
*indexPtr++ = index;
*indexPtr++ = index + meshWidth + 1;
*indexPtr++ = index + meshWidth + 2;
// upper-right triangle
*indexPtr++ = index;
*indexPtr++ = index + meshWidth + 2;
*indexPtr++ = index + 1;
// bump to the next cell
index += 1;
}
// bump to the next row
index += 1;
}
SkASSERT(indexPtr - indices == indexCount);
SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize);
}
// double-check that we have legal indices
#ifdef SK_DEBUG
{
for (int i = 0; i < indexCount; i++) {
SkASSERT((unsigned)indices[i] < (unsigned)ptCount);
}
}
#endif
// cons-up a shader for the bitmap
SkPaint tmpPaint;
if (paint) {
tmpPaint = *paint;
}
sk_sp<SkImage> image = SkMakeImageFromRasterBitmap(bitmap, kNever_SkCopyPixelsMode);
tmpPaint.setShader(image->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode));
mCanvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, (SkPoint*)vertices,
texs, (const SkColor*)colors, indices,
indexCount, tmpPaint);
}
void SkiaCanvas::drawNinePatch(Bitmap& hwuiBitmap, const Res_png_9patch& chunk,
float dstLeft, float dstTop, float dstRight, float dstBottom, const SkPaint* paint) {
SkBitmap bitmap;
hwuiBitmap.getSkBitmap(&bitmap);
SkCanvas::Lattice lattice;
NinePatchUtils::SetLatticeDivs(&lattice, chunk, bitmap.width(), bitmap.height());
lattice.fFlags = nullptr;
int numFlags = 0;
if (chunk.numColors > 0 && chunk.numColors == NinePatchUtils::NumDistinctRects(lattice)) {
// We can expect the framework to give us a color for every distinct rect.
// Skia requires a flag for every rect.
numFlags = (lattice.fXCount + 1) * (lattice.fYCount + 1);
}
SkAutoSTMalloc<25, SkCanvas::Lattice::Flags> flags(numFlags);
if (numFlags > 0) {
NinePatchUtils::SetLatticeFlags(&lattice, flags.get(), numFlags, chunk);
}
lattice.fBounds = nullptr;
SkRect dst = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom);
mCanvas->drawBitmapLattice(bitmap, lattice, dst, paint);
}
void SkiaCanvas::drawVectorDrawable(VectorDrawableRoot* vectorDrawable) {
vectorDrawable->drawStaging(this);
}
// ----------------------------------------------------------------------------
// Canvas draw operations: Text
// ----------------------------------------------------------------------------
void SkiaCanvas::drawGlyphs(const uint16_t* text, const float* positions, int count,
const SkPaint& paint, float x, float y,
float boundsLeft, float boundsTop, float boundsRight, float boundsBottom,
float totalAdvance) {
if (!text || !positions || count <= 0 || PaintUtils::paintWillNotDrawText(paint)) return;
// Set align to left for drawing, as we don't want individual
// glyphs centered or right-aligned; the offset above takes
// care of all alignment.
SkPaint paintCopy(paint);
paintCopy.setTextAlign(SkPaint::kLeft_Align);
SkRect bounds = SkRect::MakeLTRB(boundsLeft + x, boundsTop + y,
boundsRight + x, boundsBottom + y);
SkTextBlobBuilder builder;
const SkTextBlobBuilder::RunBuffer& buffer = builder.allocRunPos(paintCopy, count, &bounds);
// TODO: we could reduce the number of memcpy's if the this were exposed further up
// in the architecture.
memcpy(buffer.glyphs, text, count * sizeof(uint16_t));
memcpy(buffer.pos, positions, (count << 1) * sizeof(float));
sk_sp<SkTextBlob> textBlob(builder.make());
mCanvas->drawTextBlob(textBlob, 0, 0, paintCopy);
drawTextDecorations(x, y, totalAdvance, paintCopy);
}
void SkiaCanvas::drawLayoutOnPath(const minikin::Layout& layout, float hOffset, float vOffset,
const SkPaint& paint, const SkPath& path, size_t start, size_t end) {
const int N = end - start;
SkAutoSTMalloc<1024, uint8_t> storage(N * (sizeof(uint16_t) + sizeof(SkRSXform)));
SkRSXform* xform = (SkRSXform*)storage.get();
uint16_t* glyphs = (uint16_t*)(xform + N);
SkPathMeasure meas(path, false);
for (size_t i = start; i < end; i++) {
glyphs[i - start] = layout.getGlyphId(i);
float x = hOffset + layout.getX(i);
float y = vOffset + layout.getY(i);
SkPoint pos;
SkVector tan;
if (!meas.getPosTan(x, &pos, &tan)) {
pos.set(x, y);
tan.set(1, 0);
}
xform[i - start].fSCos = tan.x();
xform[i - start].fSSin = tan.y();
xform[i - start].fTx = pos.x() - tan.y() * y;
xform[i - start].fTy = pos.y() + tan.x() * y;
}
this->asSkCanvas()->drawTextRSXform(glyphs, sizeof(uint16_t) * N, xform, nullptr, paint);
}
// ----------------------------------------------------------------------------
// Canvas draw operations: Animations
// ----------------------------------------------------------------------------
void SkiaCanvas::drawRoundRect(uirenderer::CanvasPropertyPrimitive* left,
uirenderer::CanvasPropertyPrimitive* top, uirenderer::CanvasPropertyPrimitive* right,
uirenderer::CanvasPropertyPrimitive* bottom, uirenderer::CanvasPropertyPrimitive* rx,
uirenderer::CanvasPropertyPrimitive* ry, uirenderer::CanvasPropertyPaint* paint) {
sk_sp<uirenderer::skiapipeline::AnimatedRoundRect> drawable(
new uirenderer::skiapipeline::AnimatedRoundRect(left, top, right, bottom, rx, ry, paint));
mCanvas->drawDrawable(drawable.get());
}
void SkiaCanvas::drawCircle(uirenderer::CanvasPropertyPrimitive* x, uirenderer::CanvasPropertyPrimitive* y,
uirenderer::CanvasPropertyPrimitive* radius, uirenderer::CanvasPropertyPaint* paint) {
sk_sp<uirenderer::skiapipeline::AnimatedCircle> drawable(new uirenderer::skiapipeline::AnimatedCircle(x, y, radius, paint));
mCanvas->drawDrawable(drawable.get());
}
// ----------------------------------------------------------------------------
// Canvas draw operations: View System
// ----------------------------------------------------------------------------
void SkiaCanvas::drawLayer(uirenderer::DeferredLayerUpdater* layerUpdater) {
LOG_ALWAYS_FATAL("SkiaCanvas can't directly draw Layers");
}
void SkiaCanvas::drawRenderNode(uirenderer::RenderNode* renderNode) {
LOG_ALWAYS_FATAL("SkiaCanvas can't directly draw RenderNodes");
}
void SkiaCanvas::callDrawGLFunction(Functor* functor,
uirenderer::GlFunctorLifecycleListener* listener) {
LOG_ALWAYS_FATAL("SkiaCanvas can't directly draw GL Content");
}
} // namespace android