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/* |
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* The ManaPlus Client |
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* Copyright (C) 2004-2009 The Mana World Development Team |
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* Copyright (C) 2009-2010 The Mana Developers |
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* Copyright (C) 2011-2019 The ManaPlus Developers |
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* Copyright (C) 2019-2021 Andrei Karas |
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* |
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* This file is part of The ManaPlus Client. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include "utils/pnglib.h" |
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#include "utils/cast.h" |
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#include "utils/checkutils.h" |
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#include <png.h> |
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PRAGMA48(GCC diagnostic push) |
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PRAGMA48(GCC diagnostic ignored "-Wshadow") |
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#include <SDL_video.h> |
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PRAGMA48(GCC diagnostic pop) |
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#include "debug.h" |
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bool PngLib::writePNG(SDL_Surface *const surface, |
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const std::string &filename) |
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{ |
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if (surface == nullptr) |
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return false; |
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if (SDL_MUSTLOCK(surface)) |
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SDL_LockSurface(surface); |
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png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, |
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nullptr, nullptr, nullptr); |
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if (png_ptr == nullptr) |
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{ |
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reportAlways("Had trouble creating png_structp") |
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return false; |
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} |
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png_infop info_ptr = png_create_info_struct(png_ptr); |
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if (info_ptr == nullptr) |
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{ |
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png_destroy_write_struct(&png_ptr, static_cast<png_infopp>(nullptr)); |
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reportAlways("Could not create png_info") |
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return false; |
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} |
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if (setjmp(png_jmpbuf(png_ptr))) |
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{ |
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png_destroy_write_struct(&png_ptr, &info_ptr); |
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reportAlways("problem writing to %s", filename.c_str()) |
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return false; |
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} |
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FILE *const fp = fopen(filename.c_str(), "wb"); |
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if (fp == nullptr) |
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{ |
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reportAlways("could not open file %s for writing", |
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filename.c_str()) |
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return false; |
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} |
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png_init_io(png_ptr, fp); |
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const int colortype = (surface->format->BitsPerPixel == 24) ? |
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PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; |
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png_set_IHDR(png_ptr, info_ptr, surface->w, surface->h, 8, colortype, |
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, |
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PNG_FILTER_TYPE_DEFAULT); |
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png_write_info(png_ptr, info_ptr); |
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png_set_packing(png_ptr); |
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png_bytep *const row_pointers |
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= new png_bytep[CAST_SIZE(surface->h)]; |
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for (int i = 0; i < surface->h; i++) |
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{ |
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row_pointers[i] = static_cast<png_bytep>(static_cast<uint8_t *>( |
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surface->pixels) + CAST_SIZE(i * surface->pitch)); |
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} |
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png_write_image(png_ptr, row_pointers); |
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png_write_end(png_ptr, info_ptr); |
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fclose(fp); |
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delete [] row_pointers; |
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png_destroy_write_struct(&png_ptr, |
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&info_ptr); |
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if (SDL_MUSTLOCK(surface)) |
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SDL_UnlockSurface(surface); |
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return true; |
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} |