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122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/*
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* Copyright 2015 The Etc2Comp Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "EtcBlock4x4Encoding_RGB8.h"
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namespace Etc
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{
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class Block4x4EncodingBits_A8;
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// ################################################################################
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// Block4x4Encoding_RGBA8
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// RGBA8 if not completely opaque or transparent
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// ################################################################################
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class Block4x4Encoding_RGBA8 : public Block4x4Encoding_RGB8
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{
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public:
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Block4x4Encoding_RGBA8(void);
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virtual ~Block4x4Encoding_RGBA8(void);
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virtual void InitFromSource(Block4x4 *a_pblockParent,
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ColorFloatRGBA *a_pafrgbaSource,
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unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric);
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virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
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unsigned char *a_paucEncodingBits,
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ColorFloatRGBA *a_pafrgbaSource,
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ErrorMetric a_errormetric);
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virtual void PerformIteration(float a_fEffort);
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virtual void SetEncodingBits(void);
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protected:
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static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
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static const unsigned int ALPHA_SELECTOR_BITS = 3;
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static const unsigned int ALPHA_SELECTORS = 1 << ALPHA_SELECTOR_BITS;
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static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_SELECTORS];
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void CalculateA8(float a_fRadius);
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Block4x4EncodingBits_A8 *m_pencodingbitsA8; // A8 portion of Block4x4EncodingBits_RGBA8
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float m_fBase;
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float m_fMultiplier;
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unsigned int m_uiModifierTableIndex;
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unsigned int m_auiAlphaSelectors[PIXELS];
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private:
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inline float DecodePixelAlpha(float a_fBase, float a_fMultiplier,
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unsigned int a_uiTableIndex, unsigned int a_uiSelector)
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{
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float fPixelAlpha = a_fBase +
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a_fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector];
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if (fPixelAlpha < 0.0f)
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{
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fPixelAlpha = 0.0f;
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}
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else if (fPixelAlpha > 1.0f)
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{
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fPixelAlpha = 1.0f;
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}
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return fPixelAlpha;
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}
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};
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// ################################################################################
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// Block4x4Encoding_RGBA8_Opaque
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// RGBA8 if all pixels have alpha==1
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// ################################################################################
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class Block4x4Encoding_RGBA8_Opaque : public Block4x4Encoding_RGBA8
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{
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public:
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virtual void PerformIteration(float a_fEffort);
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virtual void SetEncodingBits(void);
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};
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// ################################################################################
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// Block4x4Encoding_RGBA8_Transparent
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// RGBA8 if all pixels have alpha==0
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// ################################################################################
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class Block4x4Encoding_RGBA8_Transparent : public Block4x4Encoding_RGBA8
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{
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public:
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virtual void PerformIteration(float a_fEffort);
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virtual void SetEncodingBits(void);
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};
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// ----------------------------------------------------------------------------------------------------
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//
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} // namespace Etc
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