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/*
* Copyright 2015 The Etc2Comp Authors.
*
* 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.
*/
#pragma once
#include "EtcBlock4x4Encoding_RGB8.h"
namespace Etc
{
class Block4x4EncodingBits_A8;
// ################################################################################
// Block4x4Encoding_RGBA8
// RGBA8 if not completely opaque or transparent
// ################################################################################
class Block4x4Encoding_RGBA8 : public Block4x4Encoding_RGB8
{
public:
Block4x4Encoding_RGBA8(void);
virtual ~Block4x4Encoding_RGBA8(void);
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
protected:
static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
static const unsigned int ALPHA_SELECTOR_BITS = 3;
static const unsigned int ALPHA_SELECTORS = 1 << ALPHA_SELECTOR_BITS;
static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_SELECTORS];
void CalculateA8(float a_fRadius);
Block4x4EncodingBits_A8 *m_pencodingbitsA8; // A8 portion of Block4x4EncodingBits_RGBA8
float m_fBase;
float m_fMultiplier;
unsigned int m_uiModifierTableIndex;
unsigned int m_auiAlphaSelectors[PIXELS];
private:
inline float DecodePixelAlpha(float a_fBase, float a_fMultiplier,
unsigned int a_uiTableIndex, unsigned int a_uiSelector)
{
float fPixelAlpha = a_fBase +
a_fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector];
if (fPixelAlpha < 0.0f)
{
fPixelAlpha = 0.0f;
}
else if (fPixelAlpha > 1.0f)
{
fPixelAlpha = 1.0f;
}
return fPixelAlpha;
}
};
// ################################################################################
// Block4x4Encoding_RGBA8_Opaque
// RGBA8 if all pixels have alpha==1
// ################################################################################
class Block4x4Encoding_RGBA8_Opaque : public Block4x4Encoding_RGBA8
{
public:
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
};
// ################################################################################
// Block4x4Encoding_RGBA8_Transparent
// RGBA8 if all pixels have alpha==0
// ################################################################################
class Block4x4Encoding_RGBA8_Transparent : public Block4x4Encoding_RGBA8
{
public:
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc
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