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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) 2011-2020 The ManaPlus Developers
* Copyright (C) 2020-2023 The ManaVerse 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;
}
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