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