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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 "EtcColorFloatRGBA.h"
#include "EtcErrorMetric.h"
#include <assert.h>
#include <float.h>
namespace Etc
{
class Block4x4;
// abstract base class for specific encodings
class Block4x4Encoding
{
public:
static const unsigned int ROWS = 4;
static const unsigned int COLUMNS = 4;
static const unsigned int PIXELS = ROWS * COLUMNS;
static const float LUMA_WEIGHT;
static const float CHROMA_BLUE_WEIGHT;
typedef enum
{
MODE_UNKNOWN,
//
MODE_ETC1,
MODE_T,
MODE_H,
MODE_PLANAR,
MODE_R11,
MODE_RG11,
//
MODES
} Mode;
Block4x4Encoding(void);
//virtual ~Block4x4Encoding(void) =0;
virtual ~Block4x4Encoding(void) {}
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric) = 0;
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric) = 0;
// perform an iteration of the encoding
// the first iteration must generate a complete, valid (if poor) encoding
virtual void PerformIteration(float a_fEffort) = 0;
void CalcBlockError(void);
inline float GetError(void)
{
assert(m_fError >= 0.0f);
return m_fError;
}
inline ColorFloatRGBA * GetDecodedColors(void)
{
return m_afrgbaDecodedColors;
}
inline float * GetDecodedAlphas(void)
{
return m_afDecodedAlphas;
}
virtual void SetEncodingBits(void) = 0;
virtual bool GetFlip(void) = 0;
virtual bool IsDifferential(void) = 0;
virtual bool HasSeverelyBentDifferentialColors(void) const = 0;
inline Mode GetMode(void)
{
return m_mode;
}
inline bool IsDone(void)
{
return m_boolDone;
}
inline void SetDoneIfPerfect()
{
if (GetError() == 0.0f)
{
m_boolDone = true;
}
}
float CalcPixelError(ColorFloatRGBA a_frgbaDecodedColor, float a_fDecodedAlpha,
ColorFloatRGBA a_frgbaSourcePixel);
protected:
void Init(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
Block4x4 *m_pblockParent;
ColorFloatRGBA *m_pafrgbaSource;
bool m_boolBorderPixels; // if block has any border pixels
ColorFloatRGBA m_afrgbaDecodedColors[PIXELS]; // decoded RGB components, ignore Alpha
float m_afDecodedAlphas[PIXELS]; // decoded alpha component
float m_fError; // error for RGBA relative to m_pafrgbaSource
// intermediate encoding
Mode m_mode;
unsigned int m_uiEncodingIterations;
bool m_boolDone; // all iterations have been done
ErrorMetric m_errormetric;
private:
};
} // namespace Etc
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