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

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

 #include "SkiaCanvasProxy.h"

 #include <cutils/log.h>
 #include <SkPatchUtils.h>
 #include <SkPaint.h>
 #include <SkPath.h>
 #include <SkPixelRef.h>
 #include <SkRect.h>
 #include <SkRRect.h>

 #include <memory>

 namespace android {
 namespace uirenderer {

 SkiaCanvasProxy::SkiaCanvasProxy(Canvas* canvas, bool filterHwuiCalls)
         : INHERITED(canvas->width(), canvas->height())
         , mCanvas(canvas)
         , mFilterHwuiCalls(filterHwuiCalls) {}

 void SkiaCanvasProxy::onDrawPaint(const SkPaint& paint) {
     mCanvas->drawPaint(paint);
 }

 void SkiaCanvasProxy::onDrawPoints(PointMode pointMode, size_t count, const SkPoint pts[],
         const SkPaint& paint) {
     if (!pts || count == 0) {
         return;
     }

     // convert the SkPoints into floats
     static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
     const size_t floatCount = count << 1;
     const float* floatArray = &pts[0].fX;

     switch (pointMode) {
         case kPoints_PointMode: {
             mCanvas->drawPoints(floatArray, floatCount, paint);
             break;
         }
         case kLines_PointMode: {
             mCanvas->drawLines(floatArray, floatCount, paint);
             break;
         }
         case kPolygon_PointMode: {
             SkPaint strokedPaint(paint);
             strokedPaint.setStyle(SkPaint::kStroke_Style);

             SkPath path;
             for (size_t i = 0; i < count - 1; i++) {
                 path.moveTo(pts[i]);
                 path.lineTo(pts[i+1]);
                 this->drawPath(path, strokedPaint);
                 path.rewind();
             }
             break;
         }
         default:
             LOG_ALWAYS_FATAL("Unknown point type");
     }
 }

 void SkiaCanvasProxy::onDrawOval(const SkRect& rect, const SkPaint& paint) {
     mCanvas->drawOval(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
 }

 void SkiaCanvasProxy::onDrawRect(const SkRect& rect, const SkPaint& paint) {
     mCanvas->drawRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
 }

 void SkiaCanvasProxy::onDrawRRect(const SkRRect& roundRect, const SkPaint& paint) {
     if (!roundRect.isComplex()) {
         const SkRect& rect = roundRect.rect();
         SkVector radii = roundRect.getSimpleRadii();
         mCanvas->drawRoundRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom,
                                radii.fX, radii.fY, paint);
     } else {
         SkPath path;
         path.addRRect(roundRect);
         mCanvas->drawPath(path, paint);
     }
 }

 void SkiaCanvasProxy::onDrawPath(const SkPath& path, const SkPaint& paint) {
     mCanvas->drawPath(path, paint);
 }

 void SkiaCanvasProxy::onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
         const SkPaint* paint) {
     SkPixelRef* pxRef = bitmap.pixelRef();

     // HWUI doesn't support extractSubset(), so convert any subsetted bitmap into
     // a drawBitmapRect(); pass through an un-subsetted bitmap.
     if (pxRef && bitmap.dimensions() != pxRef->info().dimensions()) {
         SkBitmap fullBitmap;
         fullBitmap.setInfo(pxRef->info());
         fullBitmap.setPixelRef(pxRef, 0, 0);
         SkIPoint origin = bitmap.pixelRefOrigin();
         mCanvas->drawBitmap(fullBitmap, origin.fX, origin.fY,
                             origin.fX + bitmap.dimensions().width(),
                             origin.fY + bitmap.dimensions().height(),
                             left, top,
                             left + bitmap.dimensions().width(),
                             top + bitmap.dimensions().height(),
                             paint);
     } else {
         mCanvas->drawBitmap(bitmap, left, top, paint);
     }
 }

 void SkiaCanvasProxy::onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* srcPtr,
         const SkRect& dst, const SkPaint* paint, DrawBitmapRectFlags) {
     SkRect src = (srcPtr) ? *srcPtr : SkRect::MakeWH(bitmap.width(), bitmap.height());
     // TODO: if bitmap is a subset, do we need to add pixelRefOrigin to src?
     mCanvas->drawBitmap(bitmap, src.fLeft, src.fTop, src.fRight, src.fBottom,
                         dst.fLeft, dst.fTop, dst.fRight, dst.fBottom, paint);
 }

 void SkiaCanvasProxy::onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
         const SkRect& dst, const SkPaint*) {
     //TODO make nine-patch drawing a method on Canvas.h
     SkDEBUGFAIL("SkiaCanvasProxy::onDrawBitmapNine is not yet supported");
 }

 void SkiaCanvasProxy::onDrawSprite(const SkBitmap& bitmap, int left, int top,
         const SkPaint* paint) {
     // TODO: if bitmap is a subset, do we need to add pixelRefOrigin to src?
     mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
     mCanvas->setMatrix(SkMatrix::I());
     mCanvas->drawBitmap(bitmap, left, top, paint);
     mCanvas->restore();
 }

 void SkiaCanvasProxy::onDrawVertices(VertexMode mode, int vertexCount, const SkPoint vertices[],
         const SkPoint texs[], const SkColor colors[], SkXfermode*, const uint16_t indices[],
         int indexCount, const SkPaint& paint) {
     if (mFilterHwuiCalls) {
         return;
     }
     // convert the SkPoints into floats
     static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
     const int floatCount = vertexCount << 1;
     const float* vArray = &vertices[0].fX;
     const float* tArray = (texs) ? &texs[0].fX : NULL;
     const int* cArray = (colors) ? (int*)colors : NULL;
     mCanvas->drawVertices(mode, floatCount, vArray, tArray, cArray, indices, indexCount, paint);
 }

 SkSurface* SkiaCanvasProxy::onNewSurface(const SkImageInfo&, const SkSurfaceProps&) {
     SkDEBUGFAIL("SkiaCanvasProxy::onNewSurface is not supported");
     return NULL;
 }

 void SkiaCanvasProxy::willSave() {
     mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
 }

 SkCanvas::SaveLayerStrategy SkiaCanvasProxy::willSaveLayer(const SkRect* rectPtr,
         const SkPaint* paint, SaveFlags flags) {
     SkRect rect;
     if (rectPtr) {
         rect = *rectPtr;
     } else if(!mCanvas->getClipBounds(&rect)) {
         rect = SkRect::MakeEmpty();
     }
     mCanvas->saveLayer(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint, flags);
     return SkCanvas::kNoLayer_SaveLayerStrategy;
 }

 void SkiaCanvasProxy::willRestore() {
     mCanvas->restore();
 }

 void SkiaCanvasProxy::didConcat(const SkMatrix& matrix) {
     mCanvas->concat(matrix);
 }

 void SkiaCanvasProxy::didSetMatrix(const SkMatrix& matrix) {
     mCanvas->setMatrix(matrix);
 }

 void SkiaCanvasProxy::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
         const SkPaint& paint) {
     SkPath path;
     path.addRRect(outer);
     path.addRRect(inner);
     path.setFillType(SkPath::kEvenOdd_FillType);
     this->drawPath(path, paint);
 }

 /**
  * Utility class that converts the incoming text & paint from the given encoding
  * into glyphIDs.
  */
 class GlyphIDConverter {
 public:
     GlyphIDConverter(const void* text, size_t byteLength, const SkPaint& origPaint) {
         paint = origPaint;
         if (paint.getTextEncoding() == SkPaint::kGlyphID_TextEncoding) {
             glyphIDs = (uint16_t*)text;
             count = byteLength >> 1;
         } else {
              // ensure space for one glyph per ID given UTF8 encoding.
             storage.reset(new uint16_t[byteLength]);
             glyphIDs = storage.get();
             count = paint.textToGlyphs(text, byteLength, storage.get());
             paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
         }
     }

     SkPaint paint;
     uint16_t* glyphIDs;
     int count;
 private:
     std::unique_ptr<uint16_t[]> storage;
 };

 void SkiaCanvasProxy::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
         const SkPaint& origPaint) {
     // convert to glyphIDs if necessary
     GlyphIDConverter glyphs(text, byteLength, origPaint);

     // compute the glyph positions
     std::unique_ptr<SkPoint[]> pointStorage(new SkPoint[glyphs.count]);
     std::unique_ptr<SkScalar[]> glyphWidths(new SkScalar[glyphs.count]);
     glyphs.paint.getTextWidths(glyphs.glyphIDs, glyphs.count << 1, glyphWidths.get());

     // compute conservative bounds
     // NOTE: We could call the faster paint.getFontBounds for a less accurate,
     //       but even more conservative bounds if this  is too slow.
     SkRect bounds;
     glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);

     // adjust for non-left alignment
     if (glyphs.paint.getTextAlign() != SkPaint::kLeft_Align) {
         SkScalar stop = 0;
         for (int i = 0; i < glyphs.count; i++) {
             stop += glyphWidths[i];
         }
         if (glyphs.paint.getTextAlign() == SkPaint::kCenter_Align) {
             stop = SkScalarHalf(stop);
         }
         if (glyphs.paint.isVerticalText()) {
             y -= stop;
         } else {
             x -= stop;
         }
     }

     // setup the first glyph position and adjust bounds if needed
     int xBaseline = 0;
     int yBaseline = 0;
     if (mCanvas->drawTextAbsolutePos()) {
         bounds.offset(x,y);
         xBaseline = x;
         yBaseline = y;
     }
     pointStorage[0].set(xBaseline, yBaseline);

     // setup the remaining glyph positions
     if (glyphs.paint.isVerticalText()) {
         for (int i = 1; i < glyphs.count; i++) {
             pointStorage[i].set(xBaseline, glyphWidths[i-1] + pointStorage[i-1].fY);
         }
     } else {
         for (int i = 1; i < glyphs.count; i++) {
             pointStorage[i].set(glyphWidths[i-1] + pointStorage[i-1].fX, yBaseline);
         }
     }

     static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
     mCanvas->drawText(glyphs.glyphIDs, &pointStorage[0].fX, glyphs.count, glyphs.paint,
                       x, y, bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
 }

 void SkiaCanvasProxy::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
         const SkPaint& origPaint) {
     // convert to glyphIDs if necessary
     GlyphIDConverter glyphs(text, byteLength, origPaint);

     // convert to relative positions if necessary
     int x, y;
     const SkPoint* posArray;
     std::unique_ptr<SkPoint[]> pointStorage;
     if (mCanvas->drawTextAbsolutePos()) {
         x = 0;
         y = 0;
         posArray = pos;
     } else {
         x = pos[0].fX;
         y = pos[0].fY;
         pointStorage.reset(new SkPoint[glyphs.count]);
         for (int i = 0; i < glyphs.count; i++) {
             pointStorage[i].fX = pos[i].fX - x;
             pointStorage[i].fY = pos[i].fY - y;
         }
         posArray = pointStorage.get();
     }

     // compute conservative bounds
     // NOTE: We could call the faster paint.getFontBounds for a less accurate,
     //       but even more conservative bounds if this  is too slow.
     SkRect bounds;
     glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
     bounds.offset(x, y);

     static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
     mCanvas->drawText(glyphs.glyphIDs, &posArray[0].fX, glyphs.count, glyphs.paint, x, y,
                       bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
 }

 void SkiaCanvasProxy::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
         SkScalar constY, const SkPaint& paint) {
     const size_t pointCount = byteLength >> 1;
     std::unique_ptr<SkPoint[]> pts(new SkPoint[pointCount]);
     for (size_t i = 0; i < pointCount; i++) {
         pts[i].set(xpos[i], constY);
     }
     this->onDrawPosText(text, byteLength, pts.get(), paint);
 }

 void SkiaCanvasProxy::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
         const SkMatrix* matrix, const SkPaint& origPaint) {
     // convert to glyphIDs if necessary
     GlyphIDConverter glyphs(text, byteLength, origPaint);
     mCanvas->drawTextOnPath(glyphs.glyphIDs, glyphs.count, path, 0, 0, glyphs.paint);
 }

 void SkiaCanvasProxy::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
         const SkPaint& paint) {
     SkDEBUGFAIL("SkiaCanvasProxy::onDrawTextBlob is not supported");
 }

 void SkiaCanvasProxy::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
         const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
     if (mFilterHwuiCalls) {
         return;
     }
     SkPatchUtils::VertexData data;

     SkMatrix matrix;
     mCanvas->getMatrix(&matrix);
     SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &matrix);

     // It automatically adjusts lodX and lodY in case it exceeds the number of indices.
     // If it fails to generate the vertices, then we do not draw.
     if (SkPatchUtils::getVertexData(&data, cubics, colors, texCoords, lod.width(), lod.height())) {
         this->drawVertices(SkCanvas::kTriangles_VertexMode, data.fVertexCount, data.fPoints,
                            data.fTexCoords, data.fColors, xmode, data.fIndices, data.fIndexCount,
                            paint);
     }
 }

 void SkiaCanvasProxy::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) {
     mCanvas->clipRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, op);
 }

 void SkiaCanvasProxy::onClipRRect(const SkRRect& roundRect, SkRegion::Op op, ClipEdgeStyle) {
     SkPath path;
     path.addRRect(roundRect);
     mCanvas->clipPath(&path, op);
 }

 void SkiaCanvasProxy::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) {
     mCanvas->clipPath(&path, op);
 }

 void SkiaCanvasProxy::onClipRegion(const SkRegion& region, SkRegion::Op op) {
     mCanvas->clipRegion(&region, op);
 }

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

	#include "SkiaCanvasProxy.h"

	#include <cutils/log.h>
	#include <SkPatchUtils.h>
	#include <SkPaint.h>
	#include <SkPath.h>
	#include <SkPixelRef.h>
	#include <SkRect.h>
	#include <SkRRect.h>

	#include <memory>

	namespace android {
	namespace uirenderer {

	SkiaCanvasProxy::SkiaCanvasProxy(Canvas* canvas, bool filterHwuiCalls)
	: INHERITED(canvas->width(), canvas->height())
	, mCanvas(canvas)
	, mFilterHwuiCalls(filterHwuiCalls) {}

	void SkiaCanvasProxy::onDrawPaint(const SkPaint& paint) {
	mCanvas->drawPaint(paint);
	}

	void SkiaCanvasProxy::onDrawPoints(PointMode pointMode, size_t count, const SkPoint pts[],
	const SkPaint& paint) {
	if (!pts \|\| count == 0) {
	return;
	}

	// convert the SkPoints into floats
	static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
	const size_t floatCount = count << 1;
	const float* floatArray = &pts[0].fX;

	switch (pointMode) {
	case kPoints_PointMode: {
	mCanvas->drawPoints(floatArray, floatCount, paint);
	break;
	}
	case kLines_PointMode: {
	mCanvas->drawLines(floatArray, floatCount, paint);
	break;
	}
	case kPolygon_PointMode: {
	SkPaint strokedPaint(paint);
	strokedPaint.setStyle(SkPaint::kStroke_Style);

	SkPath path;
	for (size_t i = 0; i < count - 1; i++) {
	path.moveTo(pts[i]);
	path.lineTo(pts[i+1]);
	this->drawPath(path, strokedPaint);
	path.rewind();
	}
	break;
	}
	default:
	LOG_ALWAYS_FATAL("Unknown point type");
	}
	}

	void SkiaCanvasProxy::onDrawOval(const SkRect& rect, const SkPaint& paint) {
	mCanvas->drawOval(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
	}

	void SkiaCanvasProxy::onDrawRect(const SkRect& rect, const SkPaint& paint) {
	mCanvas->drawRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
	}

	void SkiaCanvasProxy::onDrawRRect(const SkRRect& roundRect, const SkPaint& paint) {
	if (!roundRect.isComplex()) {
	const SkRect& rect = roundRect.rect();
	SkVector radii = roundRect.getSimpleRadii();
	mCanvas->drawRoundRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom,
	radii.fX, radii.fY, paint);
	} else {
	SkPath path;
	path.addRRect(roundRect);
	mCanvas->drawPath(path, paint);
	}
	}

	void SkiaCanvasProxy::onDrawPath(const SkPath& path, const SkPaint& paint) {
	mCanvas->drawPath(path, paint);
	}

	void SkiaCanvasProxy::onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
	const SkPaint* paint) {
	SkPixelRef* pxRef = bitmap.pixelRef();

	// HWUI doesn't support extractSubset(), so convert any subsetted bitmap into
	// a drawBitmapRect(); pass through an un-subsetted bitmap.
	if (pxRef && bitmap.dimensions() != pxRef->info().dimensions()) {
	SkBitmap fullBitmap;
	fullBitmap.setInfo(pxRef->info());
	fullBitmap.setPixelRef(pxRef, 0, 0);
	SkIPoint origin = bitmap.pixelRefOrigin();
	mCanvas->drawBitmap(fullBitmap, origin.fX, origin.fY,
	origin.fX + bitmap.dimensions().width(),
	origin.fY + bitmap.dimensions().height(),
	left, top,
	left + bitmap.dimensions().width(),
	top + bitmap.dimensions().height(),
	paint);
	} else {
	mCanvas->drawBitmap(bitmap, left, top, paint);
	}
	}

	void SkiaCanvasProxy::onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* srcPtr,
	const SkRect& dst, const SkPaint* paint, DrawBitmapRectFlags) {
	SkRect src = (srcPtr) ? *srcPtr : SkRect::MakeWH(bitmap.width(), bitmap.height());
	// TODO: if bitmap is a subset, do we need to add pixelRefOrigin to src?
	mCanvas->drawBitmap(bitmap, src.fLeft, src.fTop, src.fRight, src.fBottom,
	dst.fLeft, dst.fTop, dst.fRight, dst.fBottom, paint);
	}

	void SkiaCanvasProxy::onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
	const SkRect& dst, const SkPaint*) {
	//TODO make nine-patch drawing a method on Canvas.h
	SkDEBUGFAIL("SkiaCanvasProxy::onDrawBitmapNine is not yet supported");
	}

	void SkiaCanvasProxy::onDrawSprite(const SkBitmap& bitmap, int left, int top,
	const SkPaint* paint) {
	// TODO: if bitmap is a subset, do we need to add pixelRefOrigin to src?
	mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
	mCanvas->setMatrix(SkMatrix::I());
	mCanvas->drawBitmap(bitmap, left, top, paint);
	mCanvas->restore();
	}

	void SkiaCanvasProxy::onDrawVertices(VertexMode mode, int vertexCount, const SkPoint vertices[],
	const SkPoint texs[], const SkColor colors[], SkXfermode*, const uint16_t indices[],
	int indexCount, const SkPaint& paint) {
	if (mFilterHwuiCalls) {
	return;
	}
	// convert the SkPoints into floats
	static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
	const int floatCount = vertexCount << 1;
	const float* vArray = &vertices[0].fX;
	const float* tArray = (texs) ? &texs[0].fX : NULL;
	const int* cArray = (colors) ? (int*)colors : NULL;
	mCanvas->drawVertices(mode, floatCount, vArray, tArray, cArray, indices, indexCount, paint);
	}

	SkSurface* SkiaCanvasProxy::onNewSurface(const SkImageInfo&, const SkSurfaceProps&) {
	SkDEBUGFAIL("SkiaCanvasProxy::onNewSurface is not supported");
	return NULL;
	}

	void SkiaCanvasProxy::willSave() {
	mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
	}

	SkCanvas::SaveLayerStrategy SkiaCanvasProxy::willSaveLayer(const SkRect* rectPtr,
	const SkPaint* paint, SaveFlags flags) {
	SkRect rect;
	if (rectPtr) {
	rect = *rectPtr;
	} else if(!mCanvas->getClipBounds(&rect)) {
	rect = SkRect::MakeEmpty();
	}
	mCanvas->saveLayer(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint, flags);
	return SkCanvas::kNoLayer_SaveLayerStrategy;
	}

	void SkiaCanvasProxy::willRestore() {
	mCanvas->restore();
	}

	void SkiaCanvasProxy::didConcat(const SkMatrix& matrix) {
	mCanvas->concat(matrix);
	}

	void SkiaCanvasProxy::didSetMatrix(const SkMatrix& matrix) {
	mCanvas->setMatrix(matrix);
	}

	void SkiaCanvasProxy::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
	const SkPaint& paint) {
	SkPath path;
	path.addRRect(outer);
	path.addRRect(inner);
	path.setFillType(SkPath::kEvenOdd_FillType);
	this->drawPath(path, paint);
	}

	/**
	* Utility class that converts the incoming text & paint from the given encoding
	* into glyphIDs.
	*/
	class GlyphIDConverter {
	public:
	GlyphIDConverter(const void* text, size_t byteLength, const SkPaint& origPaint) {
	paint = origPaint;
	if (paint.getTextEncoding() == SkPaint::kGlyphID_TextEncoding) {
	glyphIDs = (uint16_t*)text;
	count = byteLength >> 1;
	} else {
	// ensure space for one glyph per ID given UTF8 encoding.
	storage.reset(new uint16_t[byteLength]);
	glyphIDs = storage.get();
	count = paint.textToGlyphs(text, byteLength, storage.get());
	paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
	}
	}

	SkPaint paint;
	uint16_t* glyphIDs;
	int count;
	private:
	std::unique_ptr<uint16_t[]> storage;
	};

	void SkiaCanvasProxy::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
	const SkPaint& origPaint) {
	// convert to glyphIDs if necessary
	GlyphIDConverter glyphs(text, byteLength, origPaint);

	// compute the glyph positions
	std::unique_ptr<SkPoint[]> pointStorage(new SkPoint[glyphs.count]);
	std::unique_ptr<SkScalar[]> glyphWidths(new SkScalar[glyphs.count]);
	glyphs.paint.getTextWidths(glyphs.glyphIDs, glyphs.count << 1, glyphWidths.get());

	// compute conservative bounds
	// NOTE: We could call the faster paint.getFontBounds for a less accurate,
	// but even more conservative bounds if this is too slow.
	SkRect bounds;
	glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);

	// adjust for non-left alignment
	if (glyphs.paint.getTextAlign() != SkPaint::kLeft_Align) {
	SkScalar stop = 0;
	for (int i = 0; i < glyphs.count; i++) {
	stop += glyphWidths[i];
	}
	if (glyphs.paint.getTextAlign() == SkPaint::kCenter_Align) {
	stop = SkScalarHalf(stop);
	}
	if (glyphs.paint.isVerticalText()) {
	y -= stop;
	} else {
	x -= stop;
	}
	}

	// setup the first glyph position and adjust bounds if needed
	int xBaseline = 0;
	int yBaseline = 0;
	if (mCanvas->drawTextAbsolutePos()) {
	bounds.offset(x,y);
	xBaseline = x;
	yBaseline = y;
	}
	pointStorage[0].set(xBaseline, yBaseline);

	// setup the remaining glyph positions
	if (glyphs.paint.isVerticalText()) {
	for (int i = 1; i < glyphs.count; i++) {
	pointStorage[i].set(xBaseline, glyphWidths[i-1] + pointStorage[i-1].fY);
	}
	} else {
	for (int i = 1; i < glyphs.count; i++) {
	pointStorage[i].set(glyphWidths[i-1] + pointStorage[i-1].fX, yBaseline);
	}
	}

	static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
	mCanvas->drawText(glyphs.glyphIDs, &pointStorage[0].fX, glyphs.count, glyphs.paint,
	x, y, bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
	}

	void SkiaCanvasProxy::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
	const SkPaint& origPaint) {
	// convert to glyphIDs if necessary
	GlyphIDConverter glyphs(text, byteLength, origPaint);

	// convert to relative positions if necessary
	int x, y;
	const SkPoint* posArray;
	std::unique_ptr<SkPoint[]> pointStorage;
	if (mCanvas->drawTextAbsolutePos()) {
	x = 0;
	y = 0;
	posArray = pos;
	} else {
	x = pos[0].fX;
	y = pos[0].fY;
	pointStorage.reset(new SkPoint[glyphs.count]);
	for (int i = 0; i < glyphs.count; i++) {
	pointStorage[i].fX = pos[i].fX - x;
	pointStorage[i].fY = pos[i].fY - y;
	}
	posArray = pointStorage.get();
	}

	// compute conservative bounds
	// NOTE: We could call the faster paint.getFontBounds for a less accurate,
	// but even more conservative bounds if this is too slow.
	SkRect bounds;
	glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
	bounds.offset(x, y);

	static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
	mCanvas->drawText(glyphs.glyphIDs, &posArray[0].fX, glyphs.count, glyphs.paint, x, y,
	bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
	}

	void SkiaCanvasProxy::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
	SkScalar constY, const SkPaint& paint) {
	const size_t pointCount = byteLength >> 1;
	std::unique_ptr<SkPoint[]> pts(new SkPoint[pointCount]);
	for (size_t i = 0; i < pointCount; i++) {
	pts[i].set(xpos[i], constY);
	}
	this->onDrawPosText(text, byteLength, pts.get(), paint);
	}

	void SkiaCanvasProxy::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
	const SkMatrix* matrix, const SkPaint& origPaint) {
	// convert to glyphIDs if necessary
	GlyphIDConverter glyphs(text, byteLength, origPaint);
	mCanvas->drawTextOnPath(glyphs.glyphIDs, glyphs.count, path, 0, 0, glyphs.paint);
	}

	void SkiaCanvasProxy::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
	const SkPaint& paint) {
	SkDEBUGFAIL("SkiaCanvasProxy::onDrawTextBlob is not supported");
	}

	void SkiaCanvasProxy::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
	const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
	if (mFilterHwuiCalls) {
	return;
	}
	SkPatchUtils::VertexData data;

	SkMatrix matrix;
	mCanvas->getMatrix(&matrix);
	SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &matrix);

	// It automatically adjusts lodX and lodY in case it exceeds the number of indices.
	// If it fails to generate the vertices, then we do not draw.
	if (SkPatchUtils::getVertexData(&data, cubics, colors, texCoords, lod.width(), lod.height())) {
	this->drawVertices(SkCanvas::kTriangles_VertexMode, data.fVertexCount, data.fPoints,
	data.fTexCoords, data.fColors, xmode, data.fIndices, data.fIndexCount,
	paint);
	}
	}

	void SkiaCanvasProxy::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) {
	mCanvas->clipRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, op);
	}

	void SkiaCanvasProxy::onClipRRect(const SkRRect& roundRect, SkRegion::Op op, ClipEdgeStyle) {
	SkPath path;
	path.addRRect(roundRect);
	mCanvas->clipPath(&path, op);
	}

	void SkiaCanvasProxy::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) {
	mCanvas->clipPath(&path, op);
	}

	void SkiaCanvasProxy::onClipRegion(const SkRegion& region, SkRegion::Op op) {
	mCanvas->clipRegion(&region, op);
	}

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