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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 "SkEmbossMask.h"
#include "SkFlattenableBuffers.h"
static inline int pin2byte(int n) {
if (n < 0) {
n = 0;
} else if (n > 0xFF) {
n = 0xFF;
}
return n;
}
SkMaskFilter* SkBlurMaskFilter::CreateEmboss(const SkScalar direction[3],
SkScalar ambient, SkScalar specular,
SkScalar blurRadius) {
if (direction == NULL) {
return NULL;
}
// ambient should be 0...1 as a scalar
int am = pin2byte(SkScalarToFixed(ambient) >> 8);
// specular should be 0..15.99 as a scalar
int sp = pin2byte(SkScalarToFixed(specular) >> 12);
SkEmbossMaskFilter::Light light;
memcpy(light.fDirection, direction, sizeof(light.fDirection));
light.fAmbient = SkToU8(am);
light.fSpecular = SkToU8(sp);
return SkNEW_ARGS(SkEmbossMaskFilter, (light, blurRadius));
}
///////////////////////////////////////////////////////////////////////////////
static void normalize(SkScalar v[3]) {
SkScalar mag = SkScalarSquare(v[0]) + SkScalarSquare(v[1]) + SkScalarSquare(v[2]);
mag = SkScalarSqrt(mag);
for (int i = 0; i < 3; i++) {
v[i] = SkScalarDiv(v[i], mag);
}
}
SkEmbossMaskFilter::SkEmbossMaskFilter(const Light& light, SkScalar blurRadius)
: fLight(light), fBlurRadius(blurRadius) {
normalize(fLight.fDirection);
}
SkMask::Format SkEmbossMaskFilter::getFormat() {
return SkMask::k3D_Format;
}
bool SkEmbossMaskFilter::filterMask(SkMask* dst, const SkMask& src,
const SkMatrix& matrix, SkIPoint* margin) {
SkScalar radius = matrix.mapRadius(fBlurRadius);
if (!SkBlurMask::Blur(dst, src, radius, SkBlurMask::kInner_Style,
SkBlurMask::kLow_Quality)) {
return false;
}
dst->fFormat = SkMask::k3D_Format;
if (margin) {
margin->set(SkScalarCeil(radius), SkScalarCeil(radius));
}
if (src.fImage == NULL) {
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;
}
SkEmbossMaskFilter::SkEmbossMaskFilter(SkFlattenableReadBuffer& buffer)
: SkMaskFilter(buffer) {
SkASSERT(buffer.getArrayCount() == sizeof(Light));
buffer.readByteArray(&fLight);
SkASSERT(fLight.fPad == 0); // for the font-cache lookup to be clean
fBlurRadius = buffer.readScalar();
}
void SkEmbossMaskFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
Light tmpLight = fLight;
tmpLight.fPad = 0; // for the font-cache lookup to be clean
buffer.writeByteArray(&tmpLight, sizeof(tmpLight));
buffer.writeScalar(fBlurRadius);
}
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