121 lines
3.4 KiB
C++
121 lines
3.4 KiB
C++
/*
|
|
* 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
|