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/***************************************************************************
* Copyright (C) 2005-2019 by the FIFE team *
* http://www.fifengine.net *
* This file is part of FIFE. *
* *
* FIFE is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Lesser General Public *
* License as published by the Free Software Foundation; either *
* version 2.1 of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
// Standard C++ library includes
// 3rd party library includes
// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "sdlblendingfunctions.h"
namespace FIFE {
struct ColorRGB8 {
uint8_t r, g, b;
};
struct ColorRGBA8 {
uint8_t r, g, b, a;
};
void SDL_BlendRow_RGBA8_to_RGBA8( const uint8_t* src, uint8_t* dst, uint32_t alpha, int32_t n ) {
const ColorRGBA8* srcColor = reinterpret_cast< const ColorRGBA8* >( src );
ColorRGBA8* dstColor = reinterpret_cast< ColorRGBA8* >( dst );
for( int32_t i = n; 0 < i; --i ) {
uint32_t aMulA = alpha * srcColor->a;
if( aMulA ) {
uint32_t OneMin_aMulA = 65535 - aMulA;
dstColor->r = ( aMulA * srcColor->r + OneMin_aMulA * dstColor->r ) >> 16;
dstColor->g = ( aMulA * srcColor->g + OneMin_aMulA * dstColor->g ) >> 16;
dstColor->b = ( aMulA * srcColor->b + OneMin_aMulA * dstColor->b ) >> 16;
dstColor->a = 255;
}
++dstColor;
++srcColor;
}
}
void SDL_BlendRow_RGBA8_to_RGB8( const uint8_t* src, uint8_t* dst, uint32_t alpha, int32_t n ) {
const ColorRGBA8* srcColor = reinterpret_cast< const ColorRGBA8* >( src );
ColorRGB8* dstColor = reinterpret_cast< ColorRGB8* >( dst );
for( int32_t i = n; 0 < i; --i ) {
uint32_t aMulA = alpha * srcColor->a;
if( aMulA ) {
uint32_t OneMin_aMulA = 65535 - aMulA;
dstColor->r = ( aMulA * srcColor->r + OneMin_aMulA * dstColor->r ) >> 16;
dstColor->g = ( aMulA * srcColor->g + OneMin_aMulA * dstColor->g ) >> 16;
dstColor->b = ( aMulA * srcColor->b + OneMin_aMulA * dstColor->b ) >> 16;
}
++dstColor;
++srcColor;
}
}
void SDL_BlendRow_RGBA8_to_RGB565( const uint8_t* src, uint8_t* dst, uint32_t alpha, int32_t n ) {
const ColorRGBA8* srcColor = reinterpret_cast< const ColorRGBA8* >( src );
uint16_t* dstColor = reinterpret_cast< uint16_t* >( dst );
for( int32_t i = n; 0 < i; --i ) {
uint32_t aMulA = ( alpha * srcColor->a ) >> 8;
if( aMulA ) {
uint32_t OneMin_aMulA = 255 - aMulA;
uint32_t c = *dstColor;
*dstColor = ( ( ( srcColor->b * aMulA ) +
( ( ( c & 0xF800 ) >> 8 ) * OneMin_aMulA ) ) & 0xF800 ) |
( ( ( ( srcColor->g * aMulA ) +
( ( ( c & 0x07E0 ) >> 3 ) * OneMin_aMulA ) ) >> 5 ) & 0x07E0 ) |
( ( ( ( srcColor->r * aMulA ) +
( ( ( c & 0x001F ) << 3 ) * OneMin_aMulA ) ) >> 11 ) & 0x001F );
}
++dstColor;
++srcColor;
}
}
void SDL_BlendRow_RGBA4_to_RGB565( const uint8_t* src, uint8_t* dst, uint32_t alpha, int32_t n ) {
const uint16_t* srcColor = reinterpret_cast< const uint16_t* >( src );
uint16_t* dstColor = reinterpret_cast< uint16_t* >( dst );
for( int32_t i = n; 0 < i; --i ) {
uint32_t c1 = *dstColor;
uint32_t c2 = *srcColor;
uint32_t aMulA = c2 & 0xF;
aMulA = ( alpha * aMulA ) / 15; ///< upgrade to range 0-255
if( aMulA ) {
uint32_t OneMin_aMulA = 255 - aMulA;
uint32_t result;
result = ( ( ( ( c2 & 0xF000 ) | 0x0800 ) * aMulA ) + ( ( c1 & 0xF800 ) * OneMin_aMulA ) ) & 0xF80000;
result |= ( ( ( ( ( c2 & 0x0F00 ) >> 1 ) | 0x0040 ) * aMulA ) + ( ( c1 & 0x07E0 ) * OneMin_aMulA ) ) & 0x07E000;
result |= ( ( ( ( ( c2 & 0x00F0 ) >> 3 ) | 0x0001 ) * aMulA ) + ( ( c1 & 0x001F ) * OneMin_aMulA ) ) & 0x001F00;
/// multiplying by alpha resulted in shift.
*dstColor = static_cast< uint16_t >( result >> 8 );
}
++dstColor;
++srcColor;
}
}
}
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