Mercurial > fife-parpg
view engine/core/video/sdl/sdlblendingfunctions.cpp @ 46:90005975cdbb
* Final LGPL switch step by adjusting the file headers
* Remaining issues (just slightly related to the unittest switch):
* No working unittest solution for msvc2005 yet
* Unittests not working with mingw + scons either though this seems hard to impossible to fix without an expert in this field
* sample_unit_test.cpp would need to get modified for unittest++; it still contains the old boost unittest code
author | mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222 |
---|---|
date | Sun, 13 Jul 2008 11:05:12 +0000 |
parents | 4a0efb7baf70 |
children |
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/*************************************************************************** * Copyright (C) 2005-2008 by the FIFE team * * http://www.fifengine.de * * 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 { unsigned char r, g, b; }; struct ColorRGBA8 { unsigned char r, g, b, a; }; void SDL_BlendRow_RGBA8_to_RGBA8( const unsigned char* src, unsigned char* dst, unsigned int alpha, int n ) { const ColorRGBA8* srcColor = reinterpret_cast< const ColorRGBA8* >( src ); ColorRGBA8* dstColor = reinterpret_cast< ColorRGBA8* >( dst ); for( int i = n; 0 < i; --i ) { register unsigned int aMulA = alpha * srcColor->a; if( aMulA ) { register unsigned int 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 unsigned char* src, unsigned char* dst, unsigned int alpha, int n ) { const ColorRGBA8* srcColor = reinterpret_cast< const ColorRGBA8* >( src ); ColorRGB8* dstColor = reinterpret_cast< ColorRGB8* >( dst ); for( int i = n; 0 < i; --i ) { register unsigned int aMulA = alpha * srcColor->a; if( aMulA ) { register unsigned int 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 unsigned char* src, unsigned char* dst, unsigned int alpha, int n ) { const ColorRGBA8* srcColor = reinterpret_cast< const ColorRGBA8* >( src ); unsigned short* dstColor = reinterpret_cast< unsigned short* >( dst ); for( int i = n; 0 < i; --i ) { register unsigned int aMulA = ( alpha * srcColor->a ) >> 8; if( aMulA ) { register unsigned int OneMin_aMulA = 255 - aMulA; register unsigned int 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 unsigned char* src, unsigned char* dst, unsigned int alpha, int n ) { const unsigned short* srcColor = reinterpret_cast< const unsigned short* >( src ); unsigned short* dstColor = reinterpret_cast< unsigned short* >( dst ); for( int i = n; 0 < i; --i ) { register unsigned int c1 = *dstColor; register unsigned int c2 = *srcColor; unsigned int aMulA = c2 & 0xF; aMulA = ( alpha * aMulA ) / 15; ///< upgrade to range 0-255 if( aMulA ) { register unsigned int OneMin_aMulA = 255 - aMulA; register unsigned int 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< unsigned short int >( result >> 8 ); } ++dstColor; ++srcColor; } } }