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* 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 {
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());
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.
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,
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);
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(); {
const SkPoint& offset = it.offset();
switch (it.positioning()) {
case SkTextBlobRunIterator::kDefault_Positioning:
SK_ABORT("This canvas does not support draw text.");
case SkTextBlobRunIterator::kHorizontal_Positioning:
this->drawPosTextCommon(it.glyphs(), it.glyphCount(), it.pos(), 1,
SkPoint::Make(x, y + offset.y()), it.font(), paint);
case SkTextBlobRunIterator::kFull_Positioning:
this->drawPosTextCommon(it.glyphs(), it.glyphCount(), it.pos(), 2, {x, y},
it.font(), paint);
case SkTextBlobRunIterator::kRSXform_Positioning:
// unimplemented ...
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 {
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) {
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 (, &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*) {
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;
return newPaint;