/*
* The ManaPlus Client
* Copyright (C) 2011-2014 The ManaPlus Developers
*
* This file is part of The ManaPlus Client.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* _______ __ __ __ ______ __ __ _______ __ __
* / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
* / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
* / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
* / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
* /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
* \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
*
* Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
*
*
* Per Larsson a.k.a finalman
* Olof Naessén a.k.a jansem/yakslem
*
* Visit: http://guichan.sourceforge.net
*
* License: (BSD)
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of Guichan nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 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 "gui/base/color.hpp"
namespace gcn
{
/**
* Checks a pixels 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)
{
if (!surface)
return Color(0, 0, 0, 0);
int bpp = surface->format->BytesPerPixel;
SDL_LockSurface(surface);
Uint8 *p = static_cast<uint8_t*>(surface->pixels)
+ y * surface->pitch + x * bpp;
unsigned int color = 0;
switch (bpp)
{
case 1:
color = *p;
break;
case 2:
color = *reinterpret_cast<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;
#endif
break;
case 4:
color = *reinterpret_cast<Uint32*>(p);
break;
default:
color = *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)
{
if (!surface)
return;
int bpp = surface->format->BytesPerPixel;
SDL_LockSurface(surface);
Uint8 *p = static_cast<uint8_t*>(surface->pixels)
+ y * surface->pitch + x * bpp;
Uint32 pixel = SDL_MapRGB(surface->format,
static_cast<uint8_t>(color.r), static_cast<uint8_t>(color.g),
static_cast<uint8_t>(color.b));
switch (bpp)
{
case 1:
*p = static_cast<uint8_t>(pixel);
break;
case 2:
*reinterpret_cast<uint16_t*>(p) = static_cast<uint16_t>(pixel);
break;
case 3:
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
p[0] = static_cast<uint8_t>((pixel >> 16) & 0xff);
p[1] = static_cast<uint8_t>((pixel >> 8) & 0xff);
p[2] = static_cast<uint8_t>((pixel) & 0xff);
#else
p[0] = static_cast<uint8_t>((pixel) & 0xff);
p[1] = static_cast<uint8_t>((pixel >> 8) & 0xff);
p[2] = static_cast<uint8_t>((pixel >> 16) & 0xff);
#endif
break;
case 4:
*reinterpret_cast<Uint32*>(p) = pixel;
break;
default:
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 static_cast<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 = static_cast<uint8_t*>(surface->pixels)
+ y * surface->pitch + x * bpp;
Uint32 pixel = SDL_MapRGB(surface->format,
static_cast<uint8_t>(color.r),
static_cast<uint8_t>(color.g),
static_cast<uint8_t>(color.b));
switch (bpp)
{
case 1:
*p = static_cast<uint8_t>(pixel);
break;
case 2:
*reinterpret_cast<Uint16*>(p) = SDLAlpha16(
static_cast<unsigned short>(pixel),
*reinterpret_cast<unsigned short*>(p),
static_cast<unsigned char>(color.a), surface->format);
break;
case 3:
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
p[2] = static_cast<uint8_t>((p[2] * (255 - color.a)
+ color.b * color.a) >> 8);
p[1] = static_cast<uint8_t>((p[1] * (255 - color.a)
+ color.g * color.a) >> 8);
p[0] = static_cast<uint8_t>((p[0] * (255 - color.a)
+ color.r * color.a) >> 8);
#else
p[0] = static_cast<uint8_t>((p[0] * (255 - color.a)
+ color.b * color.a) >> 8);
p[1] = static_cast<uint8_t>((p[1] * (255 - color.a)
+ color.g * color.a) >> 8);
p[2] = static_cast<uint8_t>((p[2] * (255 - color.a)
+ color.r * color.a) >> 8);
#endif
break;
case 4:
*reinterpret_cast<Uint32*>(p) = SDLAlpha32(pixel,
*reinterpret_cast<Uint32*>(p),
static_cast<unsigned char>(color.a));
break;
default:
break;
}
SDL_UnlockSurface(surface);
}
} // namespace gcn
#endif // end GCN_SDLPIXEL_HPP
