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Diffstat (limited to 'src/resources/sdlimagehelper.cpp')
| -rw-r--r-- | src/resources/sdlimagehelper.cpp | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/src/resources/sdlimagehelper.cpp b/src/resources/sdlimagehelper.cpp new file mode 100644 index 000000000..66e1bc823 --- /dev/null +++ b/src/resources/sdlimagehelper.cpp @@ -0,0 +1,280 @@ +/* + * The ManaPlus Client + * Copyright (C) 2004-2009 The Mana World Development Team + * Copyright (C) 2009-2010 The Mana Developers + * Copyright (C) 2011-2012 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/>. + */ + +#include "resources/sdlimagehelper.h" + +#include "resources/dye.h" +#include "resources/resourcemanager.h" + +#include "client.h" +#include "logger.h" +#include "main.h" + +#include "utils/stringutils.h" + +#include "resources/image.h" + +#include <SDL_image.h> +#include <SDL_rotozoom.h> + +#include "debug.h" + +bool SDLImageHelper::mEnableAlphaCache = false; + +Resource *SDLImageHelper::load(SDL_RWops *rw, Dye const &dye) +{ + SDL_Surface *tmpImage = IMG_Load_RW(rw, 1); + + if (!tmpImage) + { + logger->log("Error, image load failed: %s", IMG_GetError()); + return nullptr; + } + + SDL_Surface *surf = nullptr; + SDL_PixelFormat rgba; + rgba.palette = nullptr; + rgba.BitsPerPixel = 32; + rgba.BytesPerPixel = 4; + rgba.colorkey = 0; + rgba.alpha = 255; + rgba.Rmask = 0xFF000000; rgba.Rloss = 0; rgba.Rshift = 24; + rgba.Gmask = 0x00FF0000; rgba.Gloss = 0; rgba.Gshift = 16; + rgba.Bmask = 0x0000FF00; rgba.Bloss = 0; rgba.Bshift = 8; + rgba.Amask = 0x000000FF; rgba.Aloss = 0; rgba.Ashift = 0; + + surf = SDL_ConvertSurface(tmpImage, &rgba, SDL_SWSURFACE); + SDL_FreeSurface(tmpImage); + + Uint32 *pixels = static_cast<Uint32 *>(surf->pixels); + DyePalette *pal = dye.getSPalete(); + + if (pal) + { + for (Uint32 *p_end = pixels + surf->w * surf->h; + pixels != p_end; ++pixels) + { + Uint8 *p = (Uint8 *)pixels; + const int alpha = *p & 255; + if (!alpha) + continue; + pal->replaceColor(p + 1); + } + } + else + { + for (Uint32 *p_end = pixels + surf->w * surf->h; + pixels != p_end; ++pixels) + { + const Uint32 p = *pixels; + const int alpha = p & 255; + if (!alpha) + continue; + int v[3]; + v[0] = (p >> 24) & 255; + v[1] = (p >> 16) & 255; + v[2] = (p >> 8 ) & 255; + dye.update(v); + *pixels = (v[0] << 24) | (v[1] << 16) | (v[2] << 8) | alpha; + } + } + + Image *image = load(surf); + SDL_FreeSurface(surf); + return image; +} + +Image *SDLImageHelper::load(SDL_Surface *tmpImage) +{ + return _SDLload(tmpImage); +} + +Image *SDLImageHelper::createTextSurface(SDL_Surface *tmpImage, float alpha) +{ + if (!tmpImage) + return nullptr; + + Image *img; + + bool hasAlpha = false; + bool converted = false; + + const int sz = tmpImage->w * tmpImage->h; + + // The alpha channel to be filled with alpha values + Uint8 *alphaChannel = new Uint8[sz]; + + const SDL_PixelFormat * const fmt = tmpImage->format; + if (fmt->Amask) + { + for (int i = 0; i < sz; ++ i) + { + Uint32 c = (static_cast<Uint32*>(tmpImage->pixels))[i]; + + unsigned v = (c & fmt->Amask) >> fmt->Ashift; + Uint8 a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); + + Uint8 a2 = static_cast<Uint8>(static_cast<float>(a) * alpha); + + c &= ~fmt->Amask; + c |= ((a2 >> fmt->Aloss) << fmt->Ashift & fmt->Amask); + (static_cast<Uint32*>(tmpImage->pixels))[i] = c; + + if (a != 255) + hasAlpha = true; + + alphaChannel[i] = a; + } + } + + SDL_Surface *image; + + // Convert the surface to the current display format + if (hasAlpha) + { + image = SDL_DisplayFormatAlpha(tmpImage); + } + else + { + image = SDL_DisplayFormat(tmpImage); + + // We also delete the alpha channel since + // it's not used. + delete [] alphaChannel; + alphaChannel = nullptr; + } + + if (!image) + { + logger->log1("Error: Image convert failed."); + delete [] alphaChannel; + return nullptr; + } + + if (converted) + SDL_FreeSurface(tmpImage); + + img = new Image(image, hasAlpha, alphaChannel); + img->mAlpha = alpha; + return img; +} + +SDL_Surface* SDLImageHelper::SDLDuplicateSurface(SDL_Surface* tmpImage) +{ + if (!tmpImage || !tmpImage->format) + return nullptr; + + return SDL_ConvertSurface(tmpImage, tmpImage->format, SDL_SWSURFACE); +} + +Image *SDLImageHelper::_SDLload(SDL_Surface *tmpImage) +{ + if (!tmpImage) + return nullptr; + + bool hasAlpha = false; + bool converted = false; + + if (tmpImage->format->BitsPerPixel != 32) + { + tmpImage = convertTo32Bit(tmpImage); + + if (!tmpImage) + return nullptr; + converted = true; + } + + const int sz = tmpImage->w * tmpImage->h; + + // The alpha channel to be filled with alpha values + Uint8 *alphaChannel = new Uint8[sz]; + + // Figure out whether the image uses its alpha layer + if (!tmpImage->format->palette) + { + const SDL_PixelFormat * const fmt = tmpImage->format; + if (fmt->Amask) + { + for (int i = 0; i < sz; ++ i) + { + unsigned v = ((static_cast<Uint32*>(tmpImage->pixels))[i] + & fmt->Amask) >> fmt->Ashift; + Uint8 a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); + + if (a != 255) + hasAlpha = true; + + alphaChannel[i] = a; + } + } + else + { + if (SDL_ALPHA_OPAQUE != 255) + { + hasAlpha = true; + memset(alphaChannel, SDL_ALPHA_OPAQUE, sz); + } + } + } + else + { + if (SDL_ALPHA_OPAQUE != 255) + { + hasAlpha = true; + memset(alphaChannel, SDL_ALPHA_OPAQUE, sz); + } + } + + SDL_Surface *image; + + // Convert the surface to the current display format + if (hasAlpha) + { + image = SDL_DisplayFormatAlpha(tmpImage); + } + else + { + image = SDL_DisplayFormat(tmpImage); + + // We also delete the alpha channel since + // it's not used. + delete [] alphaChannel; + alphaChannel = nullptr; + } + + if (!image) + { + logger->log1("Error: Image convert failed."); + delete [] alphaChannel; + return nullptr; + } + + if (converted) + SDL_FreeSurface(tmpImage); + + return new Image(image, hasAlpha, alphaChannel); +} + +int SDLImageHelper::useOpenGL() +{ + return 0; +} |