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