| /* |
| * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org> |
| * Copyright (C) 2005 Eric Seidel <eric@webkit.org> |
| * Copyright (C) 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 |
| * along 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" |
| #include "FEComponentTransfer.h" |
| |
| #include "Filter.h" |
| #include "GraphicsContext.h" |
| #include <JavaScriptCore/Uint8ClampedArray.h> |
| #include <wtf/MathExtras.h> |
| #include <wtf/StdLibExtras.h> |
| #include <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| FEComponentTransfer::FEComponentTransfer(Filter& filter, const ComponentTransferFunction& redFunction, |
| const ComponentTransferFunction& greenFunction, const ComponentTransferFunction& blueFunction, const ComponentTransferFunction& alphaFunction) |
| : FilterEffect(filter) |
| , m_redFunction(redFunction) |
| , m_greenFunction(greenFunction) |
| , m_blueFunction(blueFunction) |
| , m_alphaFunction(alphaFunction) |
| { |
| } |
| |
| Ref<FEComponentTransfer> FEComponentTransfer::create(Filter& filter, const ComponentTransferFunction& redFunction, |
| const ComponentTransferFunction& greenFunction, const ComponentTransferFunction& blueFunction, const ComponentTransferFunction& alphaFunction) |
| { |
| return adoptRef(*new FEComponentTransfer(filter, redFunction, greenFunction, blueFunction, alphaFunction)); |
| } |
| |
| void FEComponentTransfer::computeIdentityTable(LookupTable&, const ComponentTransferFunction&) |
| { |
| } |
| |
| void FEComponentTransfer::computeTabularTable(LookupTable& values, const ComponentTransferFunction& transferFunction) |
| { |
| const Vector<float>& tableValues = transferFunction.tableValues; |
| unsigned n = tableValues.size(); |
| if (n < 1) |
| return; |
| for (unsigned i = 0; i < values.size(); ++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<uint8_t>(val); |
| } |
| } |
| |
| void FEComponentTransfer::computeDiscreteTable(LookupTable& values, const ComponentTransferFunction& transferFunction) |
| { |
| const Vector<float>& tableValues = transferFunction.tableValues; |
| unsigned n = tableValues.size(); |
| if (n < 1) |
| return; |
| for (unsigned i = 0; i < values.size(); ++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<uint8_t>(val); |
| } |
| } |
| |
| void FEComponentTransfer::computeLinearTable(LookupTable& values, const ComponentTransferFunction& transferFunction) |
| { |
| for (unsigned i = 0; i < values.size(); ++i) { |
| double val = transferFunction.slope * i + 255 * transferFunction.intercept; |
| val = std::max(0.0, std::min(255.0, val)); |
| values[i] = static_cast<uint8_t>(val); |
| } |
| } |
| |
| void FEComponentTransfer::computeGammaTable(LookupTable& values, const ComponentTransferFunction& transferFunction) |
| { |
| for (unsigned i = 0; i < values.size(); ++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<uint8_t>(val); |
| } |
| } |
| |
| void FEComponentTransfer::platformApplySoftware() |
| { |
| FilterEffect* in = inputEffect(0); |
| |
| Uint8ClampedArray* pixelArray = createUnmultipliedImageResult(); |
| if (!pixelArray) |
| return; |
| |
| LookupTable redTable; |
| LookupTable greenTable; |
| LookupTable blueTable; |
| LookupTable alphaTable; |
| computeLookupTables(redTable, greenTable, blueTable, alphaTable); |
| |
| IntRect drawingRect = requestedRegionOfInputImageData(in->absolutePaintRect()); |
| in->copyUnmultipliedResult(*pixelArray, drawingRect); |
| |
| unsigned pixelArrayLength = pixelArray->length(); |
| uint8_t* data = pixelArray->data(); |
| for (unsigned pixelOffset = 0; pixelOffset < pixelArrayLength; pixelOffset += 4) { |
| data[pixelOffset] = redTable[data[pixelOffset]]; |
| data[pixelOffset + 1] = greenTable[data[pixelOffset + 1]]; |
| data[pixelOffset + 2] = blueTable[data[pixelOffset + 2]]; |
| data[pixelOffset + 3] = alphaTable[data[pixelOffset + 3]]; |
| } |
| } |
| |
| void FEComponentTransfer::computeLookupTables(LookupTable& redTable, LookupTable& greenTable, LookupTable& blueTable, LookupTable& alphaTable) |
| { |
| for (unsigned i = 0; i < redTable.size(); ++i) |
| redTable[i] = greenTable[i] = blueTable[i] = alphaTable[i] = i; |
| |
| using TransferType = void (*)(LookupTable&, const ComponentTransferFunction&); |
| TransferType callEffect[] = { |
| computeIdentityTable, // FECOMPONENTTRANSFER_TYPE_UNKNOWN |
| computeIdentityTable, // FECOMPONENTTRANSFER_TYPE_IDENTITY |
| computeTabularTable, // FECOMPONENTTRANSFER_TYPE_TABLE |
| computeDiscreteTable, // FECOMPONENTTRANSFER_TYPE_DISCRETE |
| computeLinearTable, // FECOMPONENTTRANSFER_TYPE_LINEAR |
| computeGammaTable // FECOMPONENTTRANSFER_TYPE_GAMMA |
| }; |
| |
| ASSERT_WITH_SECURITY_IMPLICATION(static_cast<size_t>(m_redFunction.type) < WTF_ARRAY_LENGTH(callEffect)); |
| ASSERT_WITH_SECURITY_IMPLICATION(static_cast<size_t>(m_greenFunction.type) < WTF_ARRAY_LENGTH(callEffect)); |
| ASSERT_WITH_SECURITY_IMPLICATION(static_cast<size_t>(m_blueFunction.type) < WTF_ARRAY_LENGTH(callEffect)); |
| ASSERT_WITH_SECURITY_IMPLICATION(static_cast<size_t>(m_alphaFunction.type) < WTF_ARRAY_LENGTH(callEffect)); |
| |
| callEffect[m_redFunction.type](redTable, m_redFunction); |
| callEffect[m_greenFunction.type](greenTable, m_greenFunction); |
| callEffect[m_blueFunction.type](blueTable, m_blueFunction); |
| callEffect[m_alphaFunction.type](alphaTable, m_alphaFunction); |
| } |
| |
| static TextStream& operator<<(TextStream& ts, 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; |
| |
| switch (function.type) { |
| case FECOMPONENTTRANSFER_TYPE_UNKNOWN: |
| break; |
| case FECOMPONENTTRANSFER_TYPE_IDENTITY: |
| break; |
| case FECOMPONENTTRANSFER_TYPE_TABLE: |
| ts << " " << function.tableValues; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_DISCRETE: |
| ts << " " << function.tableValues; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_LINEAR: |
| ts << "\" slope=\"" << function.slope << "\" intercept=\"" << function.intercept << "\""; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_GAMMA: |
| ts << "\" amplitude=\"" << function.amplitude << "\" exponent=\"" << function.exponent << "\" offset=\"" << function.offset << "\""; |
| break; |
| } |
| |
| return ts; |
| } |
| |
| TextStream& FEComponentTransfer::externalRepresentation(TextStream& ts, RepresentationType representation) const |
| { |
| ts << indent << "[feComponentTransfer"; |
| FilterEffect::externalRepresentation(ts, representation); |
| ts << "\n"; |
| { |
| TextStream::IndentScope indentScope(ts, 2); |
| ts << indent << "{red: " << m_redFunction << "}\n"; |
| ts << indent << "{green: " << m_greenFunction << "}\n"; |
| ts << indent << "{blue: " << m_blueFunction << "}\n"; |
| ts << indent << "{alpha: " << m_alphaFunction << "}]\n"; |
| } |
| |
| TextStream::IndentScope indentScope(ts); |
| inputEffect(0)->externalRepresentation(ts, representation); |
| return ts; |
| } |
| |
| } // namespace WebCore |