/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkDropShadowImageFilter.h"
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#include "SkBlurImageFilter.h"
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#include "SkCanvas.h"
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#include "SkColorSpaceXformer.h"
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#include "SkImageFilterPriv.h"
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#include "SkReadBuffer.h"
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#include "SkSpecialImage.h"
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#include "SkSpecialSurface.h"
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#include "SkWriteBuffer.h"
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sk_sp<SkImageFilter> SkDropShadowImageFilter::Make(SkScalar dx, SkScalar dy,
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SkScalar sigmaX, SkScalar sigmaY,
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SkColor color, ShadowMode shadowMode,
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sk_sp<SkImageFilter> input,
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const CropRect* cropRect) {
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return sk_sp<SkImageFilter>(new SkDropShadowImageFilter(dx, dy, sigmaX, sigmaY,
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color, shadowMode,
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std::move(input),
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cropRect));
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}
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SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy,
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SkScalar sigmaX, SkScalar sigmaY, SkColor color,
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ShadowMode shadowMode, sk_sp<SkImageFilter> input,
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const CropRect* cropRect)
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: INHERITED(&input, 1, cropRect)
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, fDx(dx)
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, fDy(dy)
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, fSigmaX(sigmaX)
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, fSigmaY(sigmaY)
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, fColor(color)
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, fShadowMode(shadowMode) {
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}
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sk_sp<SkFlattenable> SkDropShadowImageFilter::CreateProc(SkReadBuffer& buffer) {
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SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
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SkScalar dx = buffer.readScalar();
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SkScalar dy = buffer.readScalar();
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SkScalar sigmaX = buffer.readScalar();
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SkScalar sigmaY = buffer.readScalar();
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SkColor color = buffer.readColor();
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ShadowMode shadowMode = buffer.read32LE(kLast_ShadowMode);
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return Make(dx, dy, sigmaX, sigmaY, color, shadowMode, common.getInput(0), &common.cropRect());
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}
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void SkDropShadowImageFilter::flatten(SkWriteBuffer& buffer) const {
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this->INHERITED::flatten(buffer);
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buffer.writeScalar(fDx);
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buffer.writeScalar(fDy);
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buffer.writeScalar(fSigmaX);
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buffer.writeScalar(fSigmaY);
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buffer.writeColor(fColor);
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buffer.writeInt(static_cast<int>(fShadowMode));
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}
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sk_sp<SkSpecialImage> SkDropShadowImageFilter::onFilterImage(SkSpecialImage* source,
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const Context& ctx,
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SkIPoint* offset) const {
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SkIPoint inputOffset = SkIPoint::Make(0, 0);
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sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
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if (!input) {
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return nullptr;
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}
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const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
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input->width(), input->height());
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SkIRect bounds;
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if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
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return nullptr;
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}
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sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.size()));
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if (!surf) {
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return nullptr;
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}
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SkCanvas* canvas = surf->getCanvas();
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SkASSERT(canvas);
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canvas->clear(0x0);
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SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
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ctx.ctm().mapVectors(&sigma, 1);
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sigma.fX = SkMaxScalar(0, sigma.fX);
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sigma.fY = SkMaxScalar(0, sigma.fY);
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setImageFilter(SkBlurImageFilter::Make(sigma.fX, sigma.fY, nullptr));
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paint.setColorFilter(SkColorFilter::MakeModeFilter(fColor, SkBlendMode::kSrcIn));
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SkVector offsetVec = SkVector::Make(fDx, fDy);
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ctx.ctm().mapVectors(&offsetVec, 1);
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canvas->translate(SkIntToScalar(inputOffset.fX - bounds.fLeft),
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SkIntToScalar(inputOffset.fY - bounds.fTop));
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input->draw(canvas, offsetVec.fX, offsetVec.fY, &paint);
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if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
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input->draw(canvas, 0, 0, nullptr);
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}
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offset->fX = bounds.fLeft;
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offset->fY = bounds.fTop;
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return surf->makeImageSnapshot();
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}
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sk_sp<SkImageFilter> SkDropShadowImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
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SkASSERT(1 == this->countInputs());
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sk_sp<SkImageFilter> input = xformer->apply(this->getInput(0));
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SkColor color = xformer->apply(fColor);
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if (input.get() != this->getInput(0) || color != fColor) {
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return SkDropShadowImageFilter::Make(fDx, fDy, fSigmaX, fSigmaY, color,
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fShadowMode, input, this->getCropRectIfSet());
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}
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return this->refMe();
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}
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SkRect SkDropShadowImageFilter::computeFastBounds(const SkRect& src) const {
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SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
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SkRect shadowBounds = bounds;
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shadowBounds.offset(fDx, fDy);
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shadowBounds.outset(fSigmaX * 3, fSigmaY * 3);
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if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
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bounds.join(shadowBounds);
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} else {
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bounds = shadowBounds;
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}
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return bounds;
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}
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SkIRect SkDropShadowImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
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MapDirection dir, const SkIRect* inputRect) const {
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SkVector offsetVec = SkVector::Make(fDx, fDy);
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if (kReverse_MapDirection == dir) {
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offsetVec.negate();
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}
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ctm.mapVectors(&offsetVec, 1);
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SkIRect dst = src.makeOffset(SkScalarCeilToInt(offsetVec.x()),
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SkScalarCeilToInt(offsetVec.y()));
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SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
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ctm.mapVectors(&sigma, 1);
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dst.outset(
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SkScalarCeilToInt(SkScalarAbs(sigma.x() * 3)),
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SkScalarCeilToInt(SkScalarAbs(sigma.y() * 3)));
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if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
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dst.join(src);
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}
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return dst;
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}
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