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/*
Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
2004, 2005 Rob Buis <buis@kde.org>
2005 Eric Seidel <eric@webkit.org>
2009 Dirk Schulze <krit@webkit.org>
Copyright (C) Research In Motion Limited 2010. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
aint with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(FILTERS)
#include "FEComponentTransfer.h"
#include "CanvasPixelArray.h"
#include "Filter.h"
#include "GraphicsContext.h"
#include "ImageData.h"
#include <math.h>
namespace WebCore {
typedef void (*TransferType)(unsigned char*, const ComponentTransferFunction&);
FEComponentTransfer::FEComponentTransfer(const ComponentTransferFunction& redFunc,
const ComponentTransferFunction& greenFunc, const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc)
: FilterEffect()
, m_redFunc(redFunc)
, m_greenFunc(greenFunc)
, m_blueFunc(blueFunc)
, m_alphaFunc(alphaFunc)
{
}
PassRefPtr<FEComponentTransfer> FEComponentTransfer::create(const ComponentTransferFunction& redFunc,
const ComponentTransferFunction& greenFunc, const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc)
{
return adoptRef(new FEComponentTransfer(redFunc, greenFunc, blueFunc, alphaFunc));
}
ComponentTransferFunction FEComponentTransfer::redFunction() const
{
return m_redFunc;
}
void FEComponentTransfer::setRedFunction(const ComponentTransferFunction& func)
{
m_redFunc = func;
}
ComponentTransferFunction FEComponentTransfer::greenFunction() const
{
return m_greenFunc;
}
void FEComponentTransfer::setGreenFunction(const ComponentTransferFunction& func)
{
m_greenFunc = func;
}
ComponentTransferFunction FEComponentTransfer::blueFunction() const
{
return m_blueFunc;
}
void FEComponentTransfer::setBlueFunction(const ComponentTransferFunction& func)
{
m_blueFunc = func;
}
ComponentTransferFunction FEComponentTransfer::alphaFunction() const
{
return m_alphaFunc;
}
void FEComponentTransfer::setAlphaFunction(const ComponentTransferFunction& func)
{
m_alphaFunc = func;
}
static void identity(unsigned char*, const ComponentTransferFunction&)
{
}
static void table(unsigned char* values, const ComponentTransferFunction& transferFunction)
{
const Vector<float>& tableValues = transferFunction.tableValues;
unsigned n = tableValues.size();
if (n < 1)
return;
for (unsigned i = 0; i < 256; ++i) {
double c = i / 255.0;
unsigned k = static_cast<unsigned>(c * (n - 1));
double v1 = tableValues[k];
double v2 = tableValues[std::min((k + 1), (n - 1))];
double val = 255.0 * (v1 + (c * (n - 1) - k) * (v2 - v1));
val = std::max(0.0, std::min(255.0, val));
values[i] = static_cast<unsigned char>(val);
}
}
static void discrete(unsigned char* values, const ComponentTransferFunction& transferFunction)
{
const Vector<float>& tableValues = transferFunction.tableValues;
unsigned n = tableValues.size();
if (n < 1)
return;
for (unsigned i = 0; i < 256; ++i) {
unsigned k = static_cast<unsigned>((i * n) / 255.0);
k = std::min(k, n - 1);
double val = 255 * tableValues[k];
val = std::max(0.0, std::min(255.0, val));
values[i] = static_cast<unsigned char>(val);
}
}
static void linear(unsigned char* values, const ComponentTransferFunction& transferFunction)
{
for (unsigned i = 0; i < 256; ++i) {
double val = transferFunction.slope * i + 255 * transferFunction.intercept;
val = std::max(0.0, std::min(255.0, val));
values[i] = static_cast<unsigned char>(val);
}
}
static void gamma(unsigned char* values, const ComponentTransferFunction& transferFunction)
{
for (unsigned i = 0; i < 256; ++i) {
double exponent = transferFunction.exponent; // RCVT doesn't like passing a double and a float to pow, so promote this to double
double val = 255.0 * (transferFunction.amplitude * pow((i / 255.0), exponent) + transferFunction.offset);
val = std::max(0.0, std::min(255.0, val));
values[i] = static_cast<unsigned char>(val);
}
}
void FEComponentTransfer::apply(Filter* filter)
{
FilterEffect* in = inputEffect(0);
in->apply(filter);
if (!in->resultImage())
return;
if (!getEffectContext())
return;
unsigned char rValues[256], gValues[256], bValues[256], aValues[256];
for (unsigned i = 0; i < 256; ++i)
rValues[i] = gValues[i] = bValues[i] = aValues[i] = i;
unsigned char* tables[] = { rValues, gValues, bValues, aValues };
ComponentTransferFunction transferFunction[] = {m_redFunc, m_greenFunc, m_blueFunc, m_alphaFunc};
TransferType callEffect[] = {identity, identity, table, discrete, linear, gamma};
for (unsigned channel = 0; channel < 4; channel++)
(*callEffect[transferFunction[channel].type])(tables[channel], transferFunction[channel]);
IntRect drawingRect = calculateDrawingIntRect(in->repaintRectInLocalCoordinates());
RefPtr<ImageData> imageData(in->resultImage()->getUnmultipliedImageData(drawingRect));
CanvasPixelArray* srcPixelArray(imageData->data());
for (unsigned pixelOffset = 0; pixelOffset < srcPixelArray->length(); pixelOffset += 4) {
for (unsigned channel = 0; channel < 4; ++channel) {
unsigned char c = srcPixelArray->get(pixelOffset + channel);
imageData->data()->set(pixelOffset + channel, tables[channel][c]);
}
}
resultImage()->putUnmultipliedImageData(imageData.get(), IntRect(IntPoint(), resultImage()->size()), IntPoint());
}
void FEComponentTransfer::dump()
{
}
static TextStream& operator<<(TextStream& ts, const ComponentTransferType& type)
{
switch (type) {
case FECOMPONENTTRANSFER_TYPE_UNKNOWN:
ts << "UNKNOWN";
break;
case FECOMPONENTTRANSFER_TYPE_IDENTITY:
ts << "IDENTITY";
break;
case FECOMPONENTTRANSFER_TYPE_TABLE:
ts << "TABLE";
break;
case FECOMPONENTTRANSFER_TYPE_DISCRETE:
ts << "DISCRETE";
break;
case FECOMPONENTTRANSFER_TYPE_LINEAR:
ts << "LINEAR";
break;
case FECOMPONENTTRANSFER_TYPE_GAMMA:
ts << "GAMMA";
break;
}
return ts;
}
static TextStream& operator<<(TextStream& ts, const ComponentTransferFunction& function)
{
ts << "type=\"" << function.type
<< "\" slope=\"" << function.slope
<< "\" intercept=\"" << function.intercept
<< "\" amplitude=\"" << function.amplitude
<< "\" exponent=\"" << function.exponent
<< "\" offset=\"" << function.offset << "\"";
return ts;
}
TextStream& FEComponentTransfer::externalRepresentation(TextStream& ts, int indent) const
{
writeIndent(ts, indent);
ts << "[feComponentTransfer";
FilterEffect::externalRepresentation(ts);
ts << " \n";
writeIndent(ts, indent + 2);
ts << "{red: " << m_redFunc << "}\n";
writeIndent(ts, indent + 2);
ts << "{green: " << m_greenFunc << "}\n";
writeIndent(ts, indent + 2);
ts << "{blue: " << m_blueFunc << "}\n";
writeIndent(ts, indent + 2);
ts << "{alpha: " << m_alphaFunc << "}]\n";
inputEffect(0)->externalRepresentation(ts, indent + 1);
return ts;
}
} // namespace WebCore
#endif // ENABLE(FILTERS)
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