src/core/SkOverdrawCanvas.cpp - skia - Git at Google

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkOverdrawCanvas.h"

 #include "SkColorFilter.h"
 #include "SkDrawShadowInfo.h"
 #include "SkDrawable.h"
 #include "SkFindAndPlaceGlyph.h"
 #include "SkImagePriv.h"
 #include "SkLatticeIter.h"
 #include "SkPatchUtils.h"
 #include "SkPath.h"
 #include "SkRRect.h"
 #include "SkRSXform.h"
 #include "SkStrikeCache.h"
 #include "SkTextBlob.h"
 #include "SkTextBlobPriv.h"
 #include "SkTo.h"

 namespace {
 class ProcessOneGlyphBounds {
 public:
     ProcessOneGlyphBounds(SkOverdrawCanvas* canvas)
         : fCanvas(canvas)
     {}

     void operator()(const SkGlyph& glyph, SkPoint position, SkPoint rounding) {
         int left = SkScalarFloorToInt(position.fX) + glyph.fLeft;
         int top = SkScalarFloorToInt(position.fY) + glyph.fTop;
         int right = left + glyph.fWidth;
         int bottom = top + glyph.fHeight;
         fCanvas->onDrawRect(SkRect::MakeLTRB(left, top, right, bottom), SkPaint());
     }

 private:
     SkOverdrawCanvas* fCanvas;
 };
 };

 SkOverdrawCanvas::SkOverdrawCanvas(SkCanvas* canvas)
     : INHERITED(canvas->onImageInfo().width(), canvas->onImageInfo().height())
 {
     // Non-drawing calls that SkOverdrawCanvas does not override (translate, save, etc.)
     // will pass through to the input canvas.
     this->addCanvas(canvas);

     static constexpr float kIncrementAlpha[] = {
             0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
             0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
             0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
             0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
     };

     fPaint.setAntiAlias(false);
     fPaint.setBlendMode(SkBlendMode::kPlus);
     fPaint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(kIncrementAlpha));
 }

 void SkOverdrawCanvas::drawPosTextCommon(const SkGlyphID glyphs[], int count, const SkScalar pos[],
                                          int scalarsPerPos, const SkPoint& offset,
                                          const SkFont& font, const SkPaint& paint) {
     ProcessOneGlyphBounds processBounds(this);
     SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
     this->getProps(&props);
     auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(
                                 font, paint, props,
                                 SkScalerContextFlags::kNone, this->getTotalMatrix());
     SkFindAndPlaceGlyph::ProcessPosText(glyphs, count,
                                         SkPoint::Make(0, 0), SkMatrix(), (const SkScalar*) pos, 2,
                                         cache.get(), processBounds);
 }

 void SkOverdrawCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
                                       const SkPaint& paint) {
     SkTextBlobRunIterator it(blob);
     for (;!it.done(); it.next()) {
         const SkPoint& offset = it.offset();
         switch (it.positioning()) {
             case SkTextBlobRunIterator::kDefault_Positioning:
                 SK_ABORT("This canvas does not support draw text.");
                 break;
             case SkTextBlobRunIterator::kHorizontal_Positioning:
                 this->drawPosTextCommon(it.glyphs(), it.glyphCount(), it.pos(), 1,
                                         SkPoint::Make(x, y + offset.y()), it.font(), paint);
                 break;
             case SkTextBlobRunIterator::kFull_Positioning:
                 this->drawPosTextCommon(it.glyphs(), it.glyphCount(), it.pos(), 2, {x, y},
                                         it.font(), paint);
                 break;
             case SkTextBlobRunIterator::kRSXform_Positioning:
                 // unimplemented ...
                 break;
         }
     }
 }

 void SkOverdrawCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                                    const SkPoint texCoords[4], SkBlendMode blendMode,
                                    const SkPaint&) {
     fList[0]->onDrawPatch(cubics, colors, texCoords, blendMode, fPaint);
 }

 void SkOverdrawCanvas::onDrawPaint(const SkPaint& paint) {
     if (0 == paint.getColor() && !paint.getColorFilter() && !paint.getShader()) {
         // This is a clear, ignore it.
     } else {
         fList[0]->onDrawPaint(this->overdrawPaint(paint));
     }
 }

 void SkOverdrawCanvas::onDrawBehind(const SkPaint& paint) {
     fList[0]->onDrawBehind(this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
     fList[0]->onDrawRect(rect, this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawEdgeAARect(const SkRect& rect, SkCanvas::QuadAAFlags aa, SkColor color,
                                         SkBlendMode mode) {
     fList[0]->onDrawRect(rect, fPaint);
 }

 void SkOverdrawCanvas::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
     fList[0]->onDrawRegion(region, this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
     fList[0]->onDrawOval(oval, this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawArc(const SkRect& arc, SkScalar startAngle, SkScalar sweepAngle,
                                  bool useCenter, const SkPaint& paint) {
     fList[0]->onDrawArc(arc, startAngle, sweepAngle, useCenter, this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
                                     const SkPaint& paint) {
     fList[0]->onDrawDRRect(outer, inner, this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawRRect(const SkRRect& rect, const SkPaint& paint) {
     fList[0]->onDrawRRect(rect, this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawPoints(PointMode mode, size_t count, const SkPoint points[],
                                     const SkPaint& paint) {
     fList[0]->onDrawPoints(mode, count, points, this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawVerticesObject(const SkVertices* vertices,
                                             const SkVertices::Bone bones[], int boneCount,
                                             SkBlendMode blendMode, const SkPaint& paint) {
     fList[0]->onDrawVerticesObject(vertices,
                                    bones,
                                    boneCount,
                                    blendMode,
                                    this->overdrawPaint(paint));
 }

 void SkOverdrawCanvas::onDrawAtlas(const SkImage* image, const SkRSXform xform[],
                                    const SkRect texs[], const SkColor colors[], int count,
                                    SkBlendMode mode, const SkRect* cull, const SkPaint* paint) {
     SkPaint* paintPtr = &fPaint;
     SkPaint storage;
     if (paint) {
         storage = this->overdrawPaint(*paint);
         paintPtr = &storage;
     }

     fList[0]->onDrawAtlas(image, xform, texs, colors, count, mode, cull, paintPtr);
 }

 void SkOverdrawCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
     fList[0]->onDrawPath(path, fPaint);
 }

 void SkOverdrawCanvas::onDrawImage(const SkImage* image, SkScalar x, SkScalar y, const SkPaint*) {
     fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, image->width(), image->height()), fPaint);
 }

 void SkOverdrawCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
                                        const SkPaint*, SrcRectConstraint) {
     fList[0]->onDrawRect(dst, fPaint);
 }

 void SkOverdrawCanvas::onDrawImageNine(const SkImage*, const SkIRect&, const SkRect& dst,
                                        const SkPaint*) {
     fList[0]->onDrawRect(dst, fPaint);
 }

 void SkOverdrawCanvas::onDrawImageLattice(const SkImage* image, const Lattice& lattice,
                                           const SkRect& dst, const SkPaint*) {
     SkIRect bounds;
     Lattice latticePlusBounds = lattice;
     if (!latticePlusBounds.fBounds) {
         bounds = SkIRect::MakeWH(image->width(), image->height());
         latticePlusBounds.fBounds = &bounds;
     }

     if (SkLatticeIter::Valid(image->width(), image->height(), latticePlusBounds)) {
         SkLatticeIter iter(latticePlusBounds, dst);

         SkRect dummy, iterDst;
         while (iter.next(&dummy, &iterDst)) {
             fList[0]->onDrawRect(iterDst, fPaint);
         }
     } else {
         fList[0]->onDrawRect(dst, fPaint);
     }
 }

 void SkOverdrawCanvas::onDrawImageSet(const ImageSetEntry set[], int count, SkFilterQuality,
                                       SkBlendMode) {
     for (int i = 0; i < count; ++i) {
         fList[0]->onDrawRect(set[i].fDstRect, fPaint);
     }
 }

 void SkOverdrawCanvas::onDrawBitmap(const SkBitmap& bitmap, SkScalar x, SkScalar y,
                                     const SkPaint*) {
     fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, bitmap.width(), bitmap.height()), fPaint);
 }

 void SkOverdrawCanvas::onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect& dst,
                                         const SkPaint*, SrcRectConstraint) {
     fList[0]->onDrawRect(dst, fPaint);
 }

 void SkOverdrawCanvas::onDrawBitmapNine(const SkBitmap&, const SkIRect&, const SkRect& dst,
                                         const SkPaint*) {
     fList[0]->onDrawRect(dst, fPaint);
 }

 void SkOverdrawCanvas::onDrawBitmapLattice(const SkBitmap& bitmap, const Lattice& lattice,
                                            const SkRect& dst, const SkPaint* paint) {
     sk_sp<SkImage> image = SkMakeImageFromRasterBitmap(bitmap, kNever_SkCopyPixelsMode);
     this->onDrawImageLattice(image.get(), lattice, dst, paint);
 }

 void SkOverdrawCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
     drawable->draw(this, matrix);
 }

 void SkOverdrawCanvas::onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) {
     SkASSERT(false);
     return;
 }

 void SkOverdrawCanvas::onDrawAnnotation(const SkRect&, const char[], SkData*) {}

 void SkOverdrawCanvas::onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) {
     SkRect bounds;
     SkDrawShadowMetrics::GetLocalBounds(path, rec, this->getTotalMatrix(), &bounds);
     fList[0]->onDrawRect(bounds, fPaint);
 }

 inline SkPaint SkOverdrawCanvas::overdrawPaint(const SkPaint& paint) {
     SkPaint newPaint = fPaint;
     newPaint.setStyle(paint.getStyle());
     newPaint.setStrokeWidth(paint.getStrokeWidth());
     return newPaint;
 }
	/*
	* Copyright 2016 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkOverdrawCanvas.h"

	#include "SkColorFilter.h"
	#include "SkDrawShadowInfo.h"
	#include "SkDrawable.h"
	#include "SkFindAndPlaceGlyph.h"
	#include "SkImagePriv.h"
	#include "SkLatticeIter.h"
	#include "SkPatchUtils.h"
	#include "SkPath.h"
	#include "SkRRect.h"
	#include "SkRSXform.h"
	#include "SkStrikeCache.h"
	#include "SkTextBlob.h"
	#include "SkTextBlobPriv.h"
	#include "SkTo.h"

	namespace {
	class ProcessOneGlyphBounds {
	public:
	ProcessOneGlyphBounds(SkOverdrawCanvas* canvas)
	: fCanvas(canvas)
	{}

	void operator()(const SkGlyph& glyph, SkPoint position, SkPoint rounding) {
	int left = SkScalarFloorToInt(position.fX) + glyph.fLeft;
	int top = SkScalarFloorToInt(position.fY) + glyph.fTop;
	int right = left + glyph.fWidth;
	int bottom = top + glyph.fHeight;
	fCanvas->onDrawRect(SkRect::MakeLTRB(left, top, right, bottom), SkPaint());
	}

	private:
	SkOverdrawCanvas* fCanvas;
	};
	};

	SkOverdrawCanvas::SkOverdrawCanvas(SkCanvas* canvas)
	: INHERITED(canvas->onImageInfo().width(), canvas->onImageInfo().height())
	{
	// Non-drawing calls that SkOverdrawCanvas does not override (translate, save, etc.)
	// will pass through to the input canvas.
	this->addCanvas(canvas);

	static constexpr float kIncrementAlpha[] = {
	0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
	0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
	0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
	0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
	};

	fPaint.setAntiAlias(false);
	fPaint.setBlendMode(SkBlendMode::kPlus);
	fPaint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(kIncrementAlpha));
	}

	void SkOverdrawCanvas::drawPosTextCommon(const SkGlyphID glyphs[], int count, const SkScalar pos[],
	int scalarsPerPos, const SkPoint& offset,
	const SkFont& font, const SkPaint& paint) {
	ProcessOneGlyphBounds processBounds(this);
	SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
	this->getProps(&props);
	auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(
	font, paint, props,
	SkScalerContextFlags::kNone, this->getTotalMatrix());
	SkFindAndPlaceGlyph::ProcessPosText(glyphs, count,
	SkPoint::Make(0, 0), SkMatrix(), (const SkScalar*) pos, 2,
	cache.get(), processBounds);
	}

	void SkOverdrawCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
	const SkPaint& paint) {
	SkTextBlobRunIterator it(blob);
	for (;!it.done(); it.next()) {
	const SkPoint& offset = it.offset();
	switch (it.positioning()) {
	case SkTextBlobRunIterator::kDefault_Positioning:
	SK_ABORT("This canvas does not support draw text.");
	break;
	case SkTextBlobRunIterator::kHorizontal_Positioning:
	this->drawPosTextCommon(it.glyphs(), it.glyphCount(), it.pos(), 1,
	SkPoint::Make(x, y + offset.y()), it.font(), paint);
	break;
	case SkTextBlobRunIterator::kFull_Positioning:
	this->drawPosTextCommon(it.glyphs(), it.glyphCount(), it.pos(), 2, {x, y},
	it.font(), paint);
	break;
	case SkTextBlobRunIterator::kRSXform_Positioning:
	// unimplemented ...
	break;
	}
	}
	}

	void SkOverdrawCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
	const SkPoint texCoords[4], SkBlendMode blendMode,
	const SkPaint&) {
	fList[0]->onDrawPatch(cubics, colors, texCoords, blendMode, fPaint);
	}

	void SkOverdrawCanvas::onDrawPaint(const SkPaint& paint) {
	if (0 == paint.getColor() && !paint.getColorFilter() && !paint.getShader()) {
	// This is a clear, ignore it.
	} else {
	fList[0]->onDrawPaint(this->overdrawPaint(paint));
	}
	}

	void SkOverdrawCanvas::onDrawBehind(const SkPaint& paint) {
	fList[0]->onDrawBehind(this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
	fList[0]->onDrawRect(rect, this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawEdgeAARect(const SkRect& rect, SkCanvas::QuadAAFlags aa, SkColor color,
	SkBlendMode mode) {
	fList[0]->onDrawRect(rect, fPaint);
	}

	void SkOverdrawCanvas::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
	fList[0]->onDrawRegion(region, this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
	fList[0]->onDrawOval(oval, this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawArc(const SkRect& arc, SkScalar startAngle, SkScalar sweepAngle,
	bool useCenter, const SkPaint& paint) {
	fList[0]->onDrawArc(arc, startAngle, sweepAngle, useCenter, this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
	const SkPaint& paint) {
	fList[0]->onDrawDRRect(outer, inner, this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawRRect(const SkRRect& rect, const SkPaint& paint) {
	fList[0]->onDrawRRect(rect, this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawPoints(PointMode mode, size_t count, const SkPoint points[],
	const SkPaint& paint) {
	fList[0]->onDrawPoints(mode, count, points, this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawVerticesObject(const SkVertices* vertices,
	const SkVertices::Bone bones[], int boneCount,
	SkBlendMode blendMode, const SkPaint& paint) {
	fList[0]->onDrawVerticesObject(vertices,
	bones,
	boneCount,
	blendMode,
	this->overdrawPaint(paint));
	}

	void SkOverdrawCanvas::onDrawAtlas(const SkImage* image, const SkRSXform xform[],
	const SkRect texs[], const SkColor colors[], int count,
	SkBlendMode mode, const SkRect* cull, const SkPaint* paint) {
	SkPaint* paintPtr = &fPaint;
	SkPaint storage;
	if (paint) {
	storage = this->overdrawPaint(*paint);
	paintPtr = &storage;
	}

	fList[0]->onDrawAtlas(image, xform, texs, colors, count, mode, cull, paintPtr);
	}

	void SkOverdrawCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
	fList[0]->onDrawPath(path, fPaint);
	}

	void SkOverdrawCanvas::onDrawImage(const SkImage* image, SkScalar x, SkScalar y, const SkPaint*) {
	fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, image->width(), image->height()), fPaint);
	}

	void SkOverdrawCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
	const SkPaint*, SrcRectConstraint) {
	fList[0]->onDrawRect(dst, fPaint);
	}

	void SkOverdrawCanvas::onDrawImageNine(const SkImage*, const SkIRect&, const SkRect& dst,
	const SkPaint*) {
	fList[0]->onDrawRect(dst, fPaint);
	}

	void SkOverdrawCanvas::onDrawImageLattice(const SkImage* image, const Lattice& lattice,
	const SkRect& dst, const SkPaint*) {
	SkIRect bounds;
	Lattice latticePlusBounds = lattice;
	if (!latticePlusBounds.fBounds) {
	bounds = SkIRect::MakeWH(image->width(), image->height());
	latticePlusBounds.fBounds = &bounds;
	}

	if (SkLatticeIter::Valid(image->width(), image->height(), latticePlusBounds)) {
	SkLatticeIter iter(latticePlusBounds, dst);

	SkRect dummy, iterDst;
	while (iter.next(&dummy, &iterDst)) {
	fList[0]->onDrawRect(iterDst, fPaint);
	}
	} else {
	fList[0]->onDrawRect(dst, fPaint);
	}
	}

	void SkOverdrawCanvas::onDrawImageSet(const ImageSetEntry set[], int count, SkFilterQuality,
	SkBlendMode) {
	for (int i = 0; i < count; ++i) {
	fList[0]->onDrawRect(set[i].fDstRect, fPaint);
	}
	}

	void SkOverdrawCanvas::onDrawBitmap(const SkBitmap& bitmap, SkScalar x, SkScalar y,
	const SkPaint*) {
	fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, bitmap.width(), bitmap.height()), fPaint);
	}

	void SkOverdrawCanvas::onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect& dst,
	const SkPaint*, SrcRectConstraint) {
	fList[0]->onDrawRect(dst, fPaint);
	}

	void SkOverdrawCanvas::onDrawBitmapNine(const SkBitmap&, const SkIRect&, const SkRect& dst,
	const SkPaint*) {
	fList[0]->onDrawRect(dst, fPaint);
	}

	void SkOverdrawCanvas::onDrawBitmapLattice(const SkBitmap& bitmap, const Lattice& lattice,
	const SkRect& dst, const SkPaint* paint) {
	sk_sp<SkImage> image = SkMakeImageFromRasterBitmap(bitmap, kNever_SkCopyPixelsMode);
	this->onDrawImageLattice(image.get(), lattice, dst, paint);
	}

	void SkOverdrawCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
	drawable->draw(this, matrix);
	}

	void SkOverdrawCanvas::onDrawPicture(const SkPicture, const SkMatrix, const SkPaint*) {
	SkASSERT(false);
	return;
	}

	void SkOverdrawCanvas::onDrawAnnotation(const SkRect&, const char[], SkData*) {}

	void SkOverdrawCanvas::onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) {
	SkRect bounds;
	SkDrawShadowMetrics::GetLocalBounds(path, rec, this->getTotalMatrix(), &bounds);
	fList[0]->onDrawRect(bounds, fPaint);
	}

	inline SkPaint SkOverdrawCanvas::overdrawPaint(const SkPaint& paint) {
	SkPaint newPaint = fPaint;
	newPaint.setStyle(paint.getStyle());
	newPaint.setStrokeWidth(paint.getStrokeWidth());
	return newPaint;
	}