| /* |
| * 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> |
| * |
| * 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. |
| */ |
| |
| #pragma once |
| |
| #include "FilterEffect.h" |
| |
| #include "Filter.h" |
| #include <wtf/Vector.h> |
| |
| namespace WebCore { |
| |
| enum ComponentTransferType { |
| FECOMPONENTTRANSFER_TYPE_UNKNOWN = 0, |
| FECOMPONENTTRANSFER_TYPE_IDENTITY = 1, |
| FECOMPONENTTRANSFER_TYPE_TABLE = 2, |
| FECOMPONENTTRANSFER_TYPE_DISCRETE = 3, |
| FECOMPONENTTRANSFER_TYPE_LINEAR = 4, |
| FECOMPONENTTRANSFER_TYPE_GAMMA = 5 |
| }; |
| |
| struct ComponentTransferFunction { |
| ComponentTransferFunction() = default; |
| |
| ComponentTransferType type { FECOMPONENTTRANSFER_TYPE_UNKNOWN }; |
| |
| float slope { 0 }; |
| float intercept { 0 }; |
| float amplitude { 0 }; |
| float exponent { 0 }; |
| float offset { 0 }; |
| |
| Vector<float> tableValues; |
| }; |
| |
| class FEComponentTransfer : public FilterEffect { |
| public: |
| static Ref<FEComponentTransfer> create(Filter&, const ComponentTransferFunction& redFunc, const ComponentTransferFunction& greenFunc, |
| const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc); |
| |
| ComponentTransferFunction redFunction() const { return m_redFunction; } |
| ComponentTransferFunction greenFunction() const { return m_greenFunction; } |
| ComponentTransferFunction blueFunction() const { return m_blueFunction; } |
| ComponentTransferFunction alphaFunction() const { return m_alphaFunction; } |
| |
| private: |
| FEComponentTransfer(Filter&, const ComponentTransferFunction& redFunc, const ComponentTransferFunction& greenFunc, |
| const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc); |
| |
| const char* filterName() const final { return "FEComponentTransfer"; } |
| |
| using LookupTable = std::array<uint8_t, 256>; |
| |
| static void computeIdentityTable(LookupTable&, const ComponentTransferFunction&); |
| static void computeTabularTable(LookupTable&, const ComponentTransferFunction&); |
| static void computeDiscreteTable(LookupTable&, const ComponentTransferFunction&); |
| static void computeLinearTable(LookupTable&, const ComponentTransferFunction&); |
| static void computeGammaTable(LookupTable&, const ComponentTransferFunction&); |
| |
| void computeLookupTables(LookupTable& redTable, LookupTable& greenTable, LookupTable& blueTable, LookupTable& alphaTable); |
| |
| void platformApplySoftware() override; |
| |
| WTF::TextStream& externalRepresentation(WTF::TextStream&, RepresentationType) const override; |
| |
| ComponentTransferFunction m_redFunction; |
| ComponentTransferFunction m_greenFunction; |
| ComponentTransferFunction m_blueFunction; |
| ComponentTransferFunction m_alphaFunction; |
| }; |
| |
| } // namespace WebCore |
| |