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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkEmbossMaskFilter.h"
#include "SkBlurMaskFilter.h"
#include "SkBlurMask.h"
#include "SkColorPriv.h"
#include "SkEmbossMask.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkString.h"
static void normalize3(SkScalar dst[3], const SkScalar src[3]) {
SkScalar mag = SkScalarSquare(src[0]) + SkScalarSquare(src[1]) + SkScalarSquare(src[2]);
SkScalar scale = SkScalarInvert(SkScalarSqrt(mag));
for (int i = 0; i < 3; i++) {
dst[i] = src[i] * scale;
}
}
sk_sp<SkMaskFilter> SkEmbossMaskFilter::Make(SkScalar blurSigma, const Light& light) {
if (!SkScalarIsFinite(blurSigma) || blurSigma <= 0) {
return nullptr;
}
Light newLight = light;
normalize3(newLight.fDirection, light.fDirection);
if (!SkScalarsAreFinite(newLight.fDirection, 3)) {
return nullptr;
}
return sk_sp<SkMaskFilter>(new SkEmbossMaskFilter(blurSigma, newLight));
}
#ifdef SK_SUPPORT_LEGACY_EMBOSSMASKFILTER
sk_sp<SkMaskFilter> SkBlurMaskFilter::MakeEmboss(SkScalar blurSigma, const SkScalar direction[3],
SkScalar ambient, SkScalar specular) {
if (direction == nullptr) {
return nullptr;
}
SkEmbossMaskFilter::Light light;
memcpy(light.fDirection, direction, sizeof(light.fDirection));
// ambient should be 0...1 as a scalar
light.fAmbient = SkUnitScalarClampToByte(ambient);
// specular should be 0..15.99 as a scalar
static const SkScalar kSpecularMultiplier = SkIntToScalar(255) / 16;
light.fSpecular = static_cast<U8CPU>(SkScalarPin(specular, 0, 16) * kSpecularMultiplier + 0.5);
return SkEmbossMaskFilter::Make(blurSigma, light);
}
#endif
///////////////////////////////////////////////////////////////////////////////
SkEmbossMaskFilter::SkEmbossMaskFilter(SkScalar blurSigma, const Light& light)
: fLight(light), fBlurSigma(blurSigma)
{
SkASSERT(fBlurSigma > 0);
SkASSERT(SkScalarsAreFinite(fLight.fDirection, 3));
}
SkMask::Format SkEmbossMaskFilter::getFormat() const {
return SkMask::k3D_Format;
}
bool SkEmbossMaskFilter::filterMask(SkMask* dst, const SkMask& src,
const SkMatrix& matrix, SkIPoint* margin) const {
if (src.fFormat != SkMask::kA8_Format) {
return false;
}
SkScalar sigma = matrix.mapRadius(fBlurSigma);
if (!SkBlurMask::BoxBlur(dst, src, sigma, kInner_SkBlurStyle)) {
return false;
}
dst->fFormat = SkMask::k3D_Format;
if (margin) {
margin->set(SkScalarCeilToInt(3*sigma), SkScalarCeilToInt(3*sigma));
}
if (src.fImage == nullptr) {
return true;
}
// create a larger buffer for the other two channels (should force fBlur to do this for us)
{
uint8_t* alphaPlane = dst->fImage;
size_t planeSize = dst->computeImageSize();
if (0 == planeSize) {
return false; // too big to allocate, abort
}
dst->fImage = SkMask::AllocImage(planeSize * 3);
memcpy(dst->fImage, alphaPlane, planeSize);
SkMask::FreeImage(alphaPlane);
}
// run the light direction through the matrix...
Light light = fLight;
matrix.mapVectors((SkVector*)(void*)light.fDirection,
(SkVector*)(void*)fLight.fDirection, 1);
// now restore the length of the XY component
// cast to SkVector so we can call setLength (this double cast silences alias warnings)
SkVector* vec = (SkVector*)(void*)light.fDirection;
vec->setLength(light.fDirection[0],
light.fDirection[1],
SkPoint::Length(fLight.fDirection[0], fLight.fDirection[1]));
SkEmbossMask::Emboss(dst, light);
// restore original alpha
memcpy(dst->fImage, src.fImage, src.computeImageSize());
return true;
}
sk_sp<SkFlattenable> SkEmbossMaskFilter::CreateProc(SkReadBuffer& buffer) {
Light light;
if (buffer.readByteArray(&light, sizeof(Light))) {
light.fPad = 0; // for the font-cache lookup to be clean
const SkScalar sigma = buffer.readScalar();
return Make(sigma, light);
}
return nullptr;
}
void SkEmbossMaskFilter::flatten(SkWriteBuffer& buffer) const {
Light tmpLight = fLight;
tmpLight.fPad = 0; // for the font-cache lookup to be clean
buffer.writeByteArray(&tmpLight, sizeof(tmpLight));
buffer.writeScalar(fBlurSigma);
}
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