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Diffstat (limited to 'src/utils')
| -rw-r--r-- | src/utils/sdlpixel.h | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/src/utils/sdlpixel.h b/src/utils/sdlpixel.h new file mode 100644 index 000000000..2a26f28a1 --- /dev/null +++ b/src/utils/sdlpixel.h @@ -0,0 +1,232 @@ +/* + * 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 UTILS_SDLPIXEL_HPP +#define UTILS_SDLPIXEL_HPP + +#include "SDL.h" +#include "gui/base/color.hpp" + +/** + * 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 gcn::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)); +} + +/** + * 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 gcn::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); +} + +#endif // UTILS_SDLPIXEL_HPP |