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/* libs/graphics/effects/SkEmbossMaskFilter.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "SkEmbossMaskFilter.h"
#include "SkBlurMaskFilter.h"
#include "SkBlurMask.h"
#include "SkEmbossMask.h"
#include "SkBuffer.h"
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 = SkScalarToFixed(ambient) >> 8;
if (am < 0) am = 0;
else if (am > 0xFF) am = 0xFF;
// specular should be 0..15.99 as a scalar
int sp = SkScalarToFixed(specular) >> 12;
if (sp < 0) sp = 0;
else if (sp > 0xFF) sp = 0xFF;
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))
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;
}
SkFlattenable* SkEmbossMaskFilter::CreateProc(SkFlattenableReadBuffer& buffer)
{
return SkNEW_ARGS(SkEmbossMaskFilter, (buffer));
}
SkFlattenable::Factory SkEmbossMaskFilter::getFactory()
{
return CreateProc;
}
SkEmbossMaskFilter::SkEmbossMaskFilter(SkFlattenableReadBuffer& buffer) : SkMaskFilter(buffer)
{
buffer.read(&fLight, sizeof(fLight));
SkASSERT(fLight.fPad == 0); // for the font-cache lookup to be clean
fBlurRadius = buffer.readScalar();
}
void SkEmbossMaskFilter::flatten(SkFlattenableWriteBuffer& buffer)
{
this->INHERITED::flatten(buffer);
fLight.fPad = 0; // for the font-cache lookup to be clean
buffer.writeMul4(&fLight, sizeof(fLight));
buffer.writeScalar(fBlurRadius);
}
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