pandory500/redquark-amiberry-rb
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redquark-amiberry-rb/external/libguisan/include/guisan/sdl/sdlpixel.hpp
Dimitris Panokostas e12f430bd0 Reorganized externa library dependencies 
- Added external directory
- Moved capsimg submodule into external, updated references
- Moved guisan into external, updated references
- Added libxml2 into external, updated Android.mk references
- Added libmpeg2 into external (not used yet)
2019-10-22 21:10:18 +02:00

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/* _______ __ __ __ ______ __ __ _______ __ __
* / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
* / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
* / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
* / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
* /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
* \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
*
* Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
*
* Js_./
* Per Larsson a.k.a finalman _RqZ{a<^_aa
* Olof Naessén a.k.a jansem/yakslem _asww7!uY`> )\a//
* _Qhm`] _f "'c 1!5m
* Visit: http://guichan.darkbits.org )Qk<P ` _: :+' .' "{[
* .)j(] .d_/ '-( P . S
* License: (BSD) <Td/Z <fP"5(\"??"\a. .L
* Redistribution and use in source and _dV>ws?a-?' ._/L #'
* binary forms, with or without )4d[#7r, . ' )d`)[
* modification, are permitted provided _Q-5'5W..j/?' -?!\)cam'
* that the following conditions are met: j<<WP+k/);. _W=j f
* 1. Redistributions of source code must .$%w\/]Q . ."' . mj$
* retain the above copyright notice, ]E.pYY(Q]>. a J@\
* this list of conditions and the j(]1u<sE"L,. . ./^ ]{a
* following disclaimer. 4'_uomm\. )L);-4 (3=
* 2. Redistributions in binary form must )_]X{Z('a_"a7'<a"a, ]"[
* reproduce the above copyright notice, #}<]m7`Za??4,P-"'7. ).m
* this list of conditions and the ]d2e)Q(<Q( ?94 b- LQ/
* following disclaimer in the <B!</]C)d_, '(<' .f. =C+m
* documentation and/or other materials .Z!=J ]e []('-4f _ ) -.)m]'
* provided with the distribution. .w[5]' _[ /.)_-"+? _/ <W"
* 3. Neither the name of Guichan nor the :$we` _! + _/ . j?
* names of its contributors may be used =3)= _f (_yQmWW$#( "
* to endorse or promote products derived - W, sQQQQmZQ#Wwa]..
* from this software without specific (js, \[QQW$QWW#?!V"".
* prior written permission. ]y:.<\.. .
* -]n w/ ' [.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT )/ )/ !
* HOLDERS AND CONTRIBUTORS "AS IS" AND ANY < (; sac , '
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, ]^ .- %
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF c < r
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR aga< <La
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 5% )P'-3L
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR _bQf` y`..)a
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, ,J?4P'.P"_(\?d'.,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES _Pa,)!f/<[]/ ?"
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT _2-..:. .r+_,.. .
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ?a.<%"' " -'.a_ _,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ^
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GCN_SDLPIXEL_HPP
#define GCN_SDLPIXEL_HPP
#include "SDL.h"
#include "guisan/color.hpp"
namespace gcn
{
/**
* Checks a pixel color of an SDL_Surface.
*
* @param surface an SDL_Surface where to check for a pixel color.
* @param x the x coordinate on the surface.
* @param y the y coordinate on the surface.
* @return a color of a pixel.
*/
inline const Color SDLgetPixel(SDL_Surface* surface, int x, int y)
{
int bpp = surface->format->BytesPerPixel;
SDL_LockSurface(surface);
Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
unsigned int color = 0;
switch(bpp)
{
case 1:
color = *p;
break;
case 2:
color = *(Uint16 *)p;
break;
case 3:
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
{
color = p[0] << 16 | p[1] << 8 | p[2];
}
else
{
color = p[0] | p[1] << 8 | p[2] << 16;
}
break;
case 4:
color = *(Uint32 *)p;
break;
}
unsigned char r,g,b,a;
SDL_GetRGBA(color, surface->format, &r, &g, &b, &a);
SDL_UnlockSurface(surface);
return Color(r,g,b,a);
}
/**
* Puts a pixel on an SDL_Surface.
*
* @param x the x coordinate on the surface.
* @param y the y coordinate on the surface.
* @param color the color the pixel should be in.
*/
inline void SDLputPixel(SDL_Surface* surface, int x, int y, const Color& color)
{
int bpp = surface->format->BytesPerPixel;
SDL_LockSurface(surface);
Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
switch(bpp)
{
case 1:
*p = pixel;
break;
case 2:
*(Uint16 *)p = pixel;
break;
case 3:
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
{
p[0] = (pixel >> 16) & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = pixel & 0xff;
}
else
{
p[0] = pixel & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = (pixel >> 16) & 0xff;
}
break;
case 4:
*(Uint32 *)p = pixel;
break;
}
SDL_UnlockSurface(surface);
}
/**
* Blends two 32 bit colors together.
*
* @param src the source color.
* @param dst the destination color.
* @param a alpha.
*/
inline unsigned int SDLAlpha32(unsigned int src, unsigned int dst, unsigned char a)
{
unsigned int b = ((src & 0xff) * a + (dst & 0xff) * (255 - a)) >> 8;
unsigned int g = ((src & 0xff00) * a + (dst & 0xff00) * (255 - a)) >> 8;
unsigned int r = ((src & 0xff0000) * a + (dst & 0xff0000) * (255 - a)) >> 8;
return (b & 0xff) | (g & 0xff00) | (r & 0xff0000);
}
/**
* Blends two 16 bit colors together.
*
* @param src the source color.
* @param dst the destination color.
* @param a alpha.
*/
inline unsigned short SDLAlpha16(unsigned short src, unsigned short dst, unsigned char a, const SDL_PixelFormat *f)
{
unsigned int b = ((src & f->Rmask) * a + (dst & f->Rmask) * (255 - a)) >> 8;
unsigned int g = ((src & f->Gmask) * a + (dst & f->Gmask) * (255 - a)) >> 8;
unsigned int r = ((src & f->Bmask) * a + (dst & f->Bmask) * (255 - a)) >> 8;
return (unsigned short)((b & f->Rmask) | (g & f->Gmask) | (r & f->Bmask));
}
/*
typedef struct{
SDL_Palette *palette;
Uint8 BitsPerPixel;
Uint8 BytesPerPixel;
Uint32 Rmask, Gmask, Bmask, Amask;
Uint8 Rshift, Gshift, Bshift, Ashift;
Uint8 Rloss, Gloss, Bloss, Aloss;
Uint32 colorkey;
Uint8 alpha;
} SDL_PixelFormat;
*/
/**
* Puts a pixel on an SDL_Surface with alpha
*
* @param x the x coordinate on the surface.
* @param y the y coordinate on the surface.
* @param color the color the pixel should be in.
*/
inline void SDLputPixelAlpha(SDL_Surface* surface, int x, int y, const Color& color)
{
int bpp = surface->format->BytesPerPixel;
SDL_LockSurface(surface);
Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
switch(bpp)
{
case 1:
*p = pixel;
break;
case 2:
*(Uint16 *)p = SDLAlpha16(pixel, *(Uint32 *)p, color.a, surface->format);
break;
case 3:
unsigned int c;
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
{
unsigned int r = (p[0] * (255 - color.a) + color.r * color.a) >> 8;
unsigned int g = (p[1] * (255 - color.a) + color.g * color.a) >> 8;
unsigned int b = (p[2] * (255 - color.a) + color.b * color.a) >> 8;
p[2] = b;
p[1] = g;
p[0] = r;
}
else
{
unsigned int r = (p[2] * (255 - color.a) + color.r * color.a) >> 8;
unsigned int g = (p[1] * (255 - color.a) + color.g * color.a) >> 8;
unsigned int b = (p[0] * (255 - color.a) + color.b * color.a) >> 8;
p[0] = b;
p[1] = g;
p[2] = r;
}
break;
case 4:
*(Uint32 *)p = SDLAlpha32(pixel, *(Uint32 *)p, color.a);
break;
}
SDL_UnlockSurface(surface);
}
}
#endif // end GCN_SDLPIXEL_HPP
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