diff options
Diffstat (limited to 'src/utils')
| -rw-r--r-- | src/utils/pnglib.cpp | 113 | ||||
| -rw-r--r-- | src/utils/pnglib.h | 38 |
2 files changed, 151 insertions, 0 deletions
diff --git a/src/utils/pnglib.cpp b/src/utils/pnglib.cpp new file mode 100644 index 000000000..d472bd565 --- /dev/null +++ b/src/utils/pnglib.cpp @@ -0,0 +1,113 @@ +/* + * The ManaPlus Client + * Copyright (C) 2004-2009 The Mana World Development Team + * Copyright (C) 2009-2010 The Mana Developers + * Copyright (C) 2011-2017 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 "utils/pnglib.h" + +#include "utils/cast.h" +#include "utils/checkutils.h" + +#include <png.h> +PRAGMA48(GCC diagnostic push) +PRAGMA48(GCC diagnostic ignored "-Wshadow") +#include <SDL_video.h> +PRAGMA48(GCC diagnostic pop) + +#include "debug.h" + +bool PngLib::writePNG(SDL_Surface *const surface, + const std::string &filename) +{ + if (surface == nullptr) + return false; + + + if (SDL_MUSTLOCK(surface)) + SDL_LockSurface(surface); + + png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, + nullptr, nullptr, nullptr); + if (png_ptr == nullptr) + { + reportAlways("Had trouble creating png_structp"); + return false; + } + + png_infop info_ptr = png_create_info_struct(png_ptr); + if (info_ptr == nullptr) + { + png_destroy_write_struct(&png_ptr, static_cast<png_infopp>(nullptr)); + reportAlways("Could not create png_info"); + return false; + } + + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_write_struct(&png_ptr, &info_ptr); + reportAlways("problem writing to %s", filename.c_str()); + return false; + } + + FILE *const fp = fopen(filename.c_str(), "wb"); + if (fp == nullptr) + { + reportAlways("could not open file %s for writing", + filename.c_str()); + return false; + } + + png_init_io(png_ptr, fp); + + const int colortype = (surface->format->BitsPerPixel == 24) ? + PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; + + png_set_IHDR(png_ptr, info_ptr, surface->w, surface->h, 8, colortype, + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, + PNG_FILTER_TYPE_DEFAULT); + + png_write_info(png_ptr, info_ptr); + + png_set_packing(png_ptr); + + png_bytep *const row_pointers + = new png_bytep[CAST_SIZE(surface->h)]; + + for (int i = 0; i < surface->h; i++) + { + row_pointers[i] = static_cast<png_bytep>(static_cast<uint8_t *>( + surface->pixels) + CAST_SIZE(i * surface->pitch)); + } + + png_write_image(png_ptr, row_pointers); + png_write_end(png_ptr, info_ptr); + + fclose(fp); + + delete [] row_pointers; + + png_destroy_write_struct(&png_ptr, + &info_ptr); + + if (SDL_MUSTLOCK(surface)) + SDL_UnlockSurface(surface); + + return true; +} diff --git a/src/utils/pnglib.h b/src/utils/pnglib.h new file mode 100644 index 000000000..a79c476ca --- /dev/null +++ b/src/utils/pnglib.h @@ -0,0 +1,38 @@ +/* + * The ManaPlus Client + * Copyright (C) 2004-2009 The Mana World Development Team + * Copyright (C) 2009-2010 The Mana Developers + * Copyright (C) 2011-2017 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/>. + */ + +#ifndef UTILS_PNGLIB_H +#define UTILS_PNGLIB_H + +#include <string> + +#include "localconsts.h" + +struct SDL_Surface; + +namespace PngLib +{ + bool writePNG(SDL_Surface *const surface, + const std::string &filename); +} // namespace PngLib + +#endif // UTILS_PNGLIB_H |