/* * The ManaPlus Client * Copyright (C) 2004-2009 The Mana World Development Team * Copyright (C) 2009-2010 The Mana Developers * Copyright (C) 2011-2013 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/imagewriter.h" #include "logger.h" #include <png.h> #include <SDL_video.h> #include <string> #include "debug.h" bool ImageWriter::writePNG(SDL_Surface *const surface, const std::string &filename) { if (!surface) 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) { logger->log1("Had trouble creating png_structp"); return false; } const png_infop info_ptr = png_create_info_struct(png_ptr); if (!info_ptr) { png_destroy_write_struct(&png_ptr, static_cast<png_infopp>(nullptr)); logger->log1("Could not create png_info"); return false; } if (setjmp(png_jmpbuf(png_ptr))) { png_destroy_write_struct(&png_ptr, static_cast<png_infopp>(nullptr)); logger->log("problem writing to %s", filename.c_str()); return false; } FILE *const fp = fopen(filename.c_str(), "wb"); if (!fp) { logger->log("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[surface->h]; /* if (!row_pointers) { logger->log1("Had trouble converting surface to row pointers"); fclose(fp); return false; } */ for (int i = 0; i < surface->h; i++) { row_pointers[i] = static_cast<png_bytep>(static_cast<uint8_t *>( surface->pixels)) + 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, static_cast<png_infopp>(nullptr)); if (SDL_MUSTLOCK(surface)) SDL_UnlockSurface(surface); return true; }