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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkDropShadowImageFilter.h"
#include "SkBlurImageFilter.h"
#include "SkCanvas.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
sk_sp<SkImageFilter> SkDropShadowImageFilter::Make(SkScalar dx, SkScalar dy,
SkScalar sigmaX, SkScalar sigmaY,
SkColor color, ShadowMode shadowMode,
sk_sp<SkImageFilter> input,
const CropRect* cropRect) {
return sk_sp<SkImageFilter>(new SkDropShadowImageFilter(dx, dy, sigmaX, sigmaY,
color, shadowMode,
std::move(input),
cropRect));
}
SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy,
SkScalar sigmaX, SkScalar sigmaY, SkColor color,
ShadowMode shadowMode, sk_sp<SkImageFilter> input,
const CropRect* cropRect)
: INHERITED(&input, 1, cropRect)
, fDx(dx)
, fDy(dy)
, fSigmaX(sigmaX)
, fSigmaY(sigmaY)
, fColor(color)
, fShadowMode(shadowMode) {
}
sk_sp<SkFlattenable> SkDropShadowImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkScalar dx = buffer.readScalar();
SkScalar dy = buffer.readScalar();
SkScalar sigmaX = buffer.readScalar();
SkScalar sigmaY = buffer.readScalar();
SkColor color = buffer.readColor();
ShadowMode shadowMode = buffer.isVersionLT(SkReadBuffer::kDropShadowMode_Version) ?
kDrawShadowAndForeground_ShadowMode :
static_cast<ShadowMode>(buffer.readInt());
return Make(dx, dy, sigmaX, sigmaY, color, shadowMode, common.getInput(0), &common.cropRect());
}
void SkDropShadowImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fDx);
buffer.writeScalar(fDy);
buffer.writeScalar(fSigmaX);
buffer.writeScalar(fSigmaY);
buffer.writeColor(fColor);
buffer.writeInt(static_cast<int>(fShadowMode));
}
sk_sp<SkSpecialImage> SkDropShadowImageFilter::onFilterImage(SkSpecialImage* source,
const Context& ctx,
SkIPoint* offset) const {
SkIPoint inputOffset = SkIPoint::Make(0, 0);
sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
if (!input) {
return nullptr;
}
const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
input->width(), input->height());
SkIRect bounds;
if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
return nullptr;
}
const SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(),
kPremul_SkAlphaType);
sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
canvas->clear(0x0);
SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
ctx.ctm().mapVectors(&sigma, 1);
sigma.fX = SkMaxScalar(0, sigma.fX);
sigma.fY = SkMaxScalar(0, sigma.fY);
SkPaint paint;
paint.setImageFilter(SkBlurImageFilter::Make(sigma.fX, sigma.fY, nullptr));
paint.setColorFilter(SkColorFilter::MakeModeFilter(fColor, SkXfermode::kSrcIn_Mode));
paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
SkVector offsetVec = SkVector::Make(fDx, fDy);
ctx.ctm().mapVectors(&offsetVec, 1);
canvas->translate(SkIntToScalar(inputOffset.fX - bounds.fLeft),
SkIntToScalar(inputOffset.fY - bounds.fTop));
input->draw(canvas, offsetVec.fX, offsetVec.fY, &paint);
if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
input->draw(canvas, 0, 0, nullptr);
}
offset->fX = bounds.fLeft;
offset->fY = bounds.fTop;
return surf->makeImageSnapshot();
}
SkRect SkDropShadowImageFilter::computeFastBounds(const SkRect& src) const {
SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
SkRect shadowBounds = bounds;
shadowBounds.offset(fDx, fDy);
shadowBounds.outset(SkScalarMul(fSigmaX, SkIntToScalar(3)),
SkScalarMul(fSigmaY, SkIntToScalar(3)));
if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
bounds.join(shadowBounds);
} else {
bounds = shadowBounds;
}
return bounds;
}
SkIRect SkDropShadowImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
MapDirection direction) const {
SkVector offsetVec = SkVector::Make(fDx, fDy);
if (kReverse_MapDirection == direction) {
offsetVec.negate();
}
ctm.mapVectors(&offsetVec, 1);
SkIRect dst = src.makeOffset(SkScalarCeilToInt(offsetVec.x()),
SkScalarCeilToInt(offsetVec.y()));
SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
ctm.mapVectors(&sigma, 1);
dst.outset(SkScalarCeilToInt(SkScalarMul(sigma.x(), SkIntToScalar(3))),
SkScalarCeilToInt(SkScalarMul(sigma.y(), SkIntToScalar(3))));
if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
dst.join(src);
}
return dst;
}
#ifndef SK_IGNORE_TO_STRING
void SkDropShadowImageFilter::toString(SkString* str) const {
str->appendf("SkDropShadowImageFilter: (");
str->appendf("dX: %f ", fDx);
str->appendf("dY: %f ", fDy);
str->appendf("sigmaX: %f ", fSigmaX);
str->appendf("sigmaY: %f ", fSigmaY);
str->append("Color: ");
str->appendHex(fColor);
static const char* gModeStrings[] = {
"kDrawShadowAndForeground", "kDrawShadowOnly"
};
static_assert(kShadowModeCount == SK_ARRAY_COUNT(gModeStrings), "enum_mismatch");
str->appendf(" mode: %s", gModeStrings[fShadowMode]);
str->append(")");
}
#endif
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