sdl2imagehelper.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2004-2009 The Mana World Development Team
 * Copyright (C) 2009-2010 The Mana Developers
 * Copyright (C) 2011-2019 The ManaPlus Developers
 * Copyright (C) 2019-2021 Andrei Karas
 *
 * 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/>.
 */
 
#ifdef USE_SDL2
 
#include "resources/sdl2imagehelper.h"
 
#include "resources/image/image.h"
 
#include "utils/checkutils.h"
#include "utils/sdlcheckutils.h"
 
#include "debug.h"
 
bool SDLImageHelper::mEnableAlphaCache = false;
SDL_Renderer *SDLImageHelper::mRenderer = nullptr;
 
Image *SDLImageHelper::loadSurface(SDL_Surface *const tmpImage)
{
 return _SDLload(tmpImage);
}
 
Image *SDLImageHelper::createTextSurface(SDL_Surface *const tmpImage,
 const int width A_UNUSED,
 const int height A_UNUSED,
 const float alpha)
{
 if (!tmpImage)
 return nullptr;
 
 Image *const img = _SDLload(tmpImage);
 if (img)
 img->setAlpha(alpha);
 return img;
}
 
SDL_Surface* SDLImageHelper::SDLDuplicateSurface(SDL_Surface *const tmpImage)
{
 if (!tmpImage || !tmpImage->format)
 return nullptr;
 
 return MSDL_ConvertSurface(tmpImage, tmpImage->format, SDL_SWSURFACE);
}
 
Image *SDLImageHelper::_SDLload(SDL_Surface *tmpImage)
{
 if (!tmpImage)
 return nullptr;
 
 SDL_Texture *const texture = SDL_CreateTextureFromSurface(
 mRenderer, tmpImage);
 if (!texture)
 {
 reportAlways("Texture from surface creation failed: %s",
 SDL_GetError())
 return nullptr;
 }
 SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
 return new Image(texture, tmpImage->w, tmpImage->h);
}
 
int SDLImageHelper::combineSurface(SDL_Surface *restrict const src,
 SDL_Rect *restrict const srcrect,
 SDL_Surface *restrict const dst,
 SDL_Rect *restrict const dstrect)
{
 SDL_SetSurfaceBlendMode(src, SDL_BLENDMODE_BLEND);
 SDL_BlitSurface(src, srcrect, dst, dstrect);
 return 1;
}
 
void SDLImageHelper::copySurfaceToImage(const Image *const image,
 const int x, const int y,
 SDL_Surface *const surface) const
{
 if (!image || !surface)
 return;
 
 SDL_SetSurfaceAlphaMod(surface, SDL_ALPHA_OPAQUE);
 SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE);
 
 SDL_Rect rect =
 {
 x, y,
 surface->w, surface->h
 };
 
 SDL_BlitSurface(surface, nullptr, image->mSDLSurface, &rect);
}
#endif // USE_SDL2