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167 lines (150 loc) · 5.04 KB
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// Copyright © 2018 CCP ehf.
#include "StdAfx.h"
#include "ImageUtility.h"
#include "include/PixelFormat.h"
namespace ImageUtility {
inline uint32_t InterpolatedColor( uint32_t color0, uint32_t weight0, uint32_t color1, uint32_t weight1, uint32_t offset, uint32_t divisor )
{
uint32_t r0 = (color0 >> 16) & 0xff;
uint32_t g0 = (color0 >> 8) & 0xff;
uint32_t b0 = (color0 >> 0) & 0xff;
uint32_t r1 = (color1 >> 16) & 0xff;
uint32_t g1 = (color1 >> 8) & 0xff;
uint32_t b1 = (color1 >> 0) & 0xff;
uint32_t r = (r0 * weight0 + r1 * weight1 + offset) / divisor & 0xff;
uint32_t g = (g0 * weight0 + g1 * weight1 + offset) / divisor & 0xff;
uint32_t b = (b0 * weight0 + b1 * weight1 + offset) / divisor & 0xff;
return (r << 16) | (g << 8) | b;
}
uint32_t ConvertBGR565A8ToBGRA8( uint32_t color, uint32_t alpha )
{
return uint32_t( color & 0x1f ) * 255 / 31 |
( uint32_t( ( color >> 5 ) & 0x3f ) * 255 / 63 ) << 8 |
( uint32_t( ( color >> 11 ) & 0x1f ) * 255 / 31 ) << 16 |
( alpha << 24 );
}
uint32_t GetPixelColor_BGRA( uint32_t x, uint32_t y, uint32_t pitch, const char* source )
{
return reinterpret_cast<const uint32_t*>( source + y * pitch )[x];
}
uint32_t GetPixelColor_R( uint32_t x, uint32_t y, uint32_t pitch, const char* source )
{
return uint32_t( reinterpret_cast<const uint8_t*>( source + y * pitch )[x] ) << 16;
}
uint32_t GetPixelColor_BGRX( uint32_t x, uint32_t y, uint32_t pitch, const char* source )
{
return GetPixelColor_BGRA( x, y, pitch, source ) | 0xff000000;
}
uint32_t GetPixelColor_BC1( uint32_t x, uint32_t y, uint32_t width, uint32_t pitch, const char* source )
{
// get the block index. ((width + 3) / 4) is basically a ceiling operator!
unsigned index = x / 4 + (y / 4) * ((width + 3) / 4);
index *= GetBlockByteSize( ImageIO::PIXEL_FORMAT_BC1_UNORM );
uint32_t pixelValue;
uint32_t color0 = *reinterpret_cast<const uint16_t*>( source + index );
uint32_t color1 = *reinterpret_cast<const uint16_t*>( source + index + 2 );
uint32_t bits = *reinterpret_cast<const uint32_t*>( source + index + 4 );
x = x % 4;
y = y % 4;
if( color0 > color1 )
{
switch( (bits >> 2 * (4 * y + x)) & 3 )
{
case 0:
pixelValue = ConvertBGR565A8ToBGRA8( color0, 255 );
break;
case 1:
pixelValue = ConvertBGR565A8ToBGRA8( color1, 255 );
break;
case 2:
pixelValue = ConvertBGR565A8ToBGRA8( (2 * color0 + color1) / 3, 255 );
break;
default:
pixelValue = ConvertBGR565A8ToBGRA8( (color0 + 2 * color1) / 3, 255 );
break;
}
}
else
{
switch( (bits >> 2 * (4 * y + x)) & 3 )
{
case 0:
pixelValue = ConvertBGR565A8ToBGRA8( color0, 255 );
break;
case 1:
pixelValue = ConvertBGR565A8ToBGRA8( color1, 255 );
break;
case 2:
pixelValue = ConvertBGR565A8ToBGRA8( (color0 + color1) / 2, 255 );
break;
default:
pixelValue = ConvertBGR565A8ToBGRA8( (color0 + 2 * color1) / 3, 0 );
break;
}
}
return pixelValue;
}
uint32_t GetPixelColor_BC3( uint32_t x, uint32_t y, uint32_t width, uint32_t pitch, const char* source )
{
unsigned index = x / 4 + (y / 4) * ((width + 3) / 4);
index *= GetBlockByteSize( ImageIO::PIXEL_FORMAT_BC3_UNORM );
unsigned pixelValue;
uint32_t alpha[8];
alpha[0] = *reinterpret_cast<const uint8_t*>(source);
alpha[1] = *reinterpret_cast<const uint8_t*>(source + 1);
auto alphaMask = source + 2;
uint32_t alphaMask0 = (alphaMask[0]) | (alphaMask[1] << 8) | (alphaMask[2] << 16);
uint32_t alphaMask1 = (alphaMask[3]) | (alphaMask[4] << 8) | (alphaMask[5] << 16);
if( alpha[0] > alpha[1] )
{
alpha[2] = (6 * alpha[0] + 1 * alpha[1] + 3) / 7;
alpha[3] = (5 * alpha[0] + 2 * alpha[1] + 3) / 7;
alpha[4] = (4 * alpha[0] + 3 * alpha[1] + 3) / 7;
alpha[5] = (3 * alpha[0] + 4 * alpha[1] + 3) / 7;
alpha[6] = (2 * alpha[0] + 5 * alpha[1] + 3) / 7;
alpha[7] = (1 * alpha[0] + 6 * alpha[1] + 3) / 7;
}
else
{
alpha[2] = (4 * alpha[0] + 1 * alpha[1] + 2) / 5;
alpha[3] = (3 * alpha[0] + 2 * alpha[1] + 2) / 5;
alpha[4] = (2 * alpha[0] + 3 * alpha[1] + 2) / 5;
alpha[5] = (1 * alpha[0] + 4 * alpha[1] + 2) / 5;
alpha[6] = 0;
alpha[7] = 255;
}
uint32_t color0 = ConvertBGR565A8ToBGRA8( *reinterpret_cast<const uint16_t*>(source + 8), 0 );
uint32_t color1 = ConvertBGR565A8ToBGRA8( *reinterpret_cast<const uint16_t*>(source + 8 + 2), 0 );
uint32_t color2 = InterpolatedColor( color0, 2, color1, 1, 1, 3 );
uint32_t color3 = InterpolatedColor( color0, 1, color1, 2, 1, 3 );
uint32_t bits = *reinterpret_cast<const uint32_t*>(source + 8 + 4);
x = x % 4;
y = y % 4;
uint32_t alphaValue;
if( y < 2 )
{
alphaValue = alpha[(alphaMask0 >> (x + y * 4) * 3) & 0x7];
}
else
{
alphaValue = alpha[(alphaMask1 >> (x + (y - 2) * 4) * 3) & 0x7];
}
alphaValue <<= 24;
switch( (bits >> 2 * (4 * y + x)) & 3 )
{
case 0:
pixelValue = color0 | alphaValue;
break;
case 1:
pixelValue = color1 | alphaValue;
break;
case 2:
pixelValue = color2 | alphaValue;
break;
default:
pixelValue = color3 | alphaValue;
break;
}
return pixelValue;
}
}