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/*
* The Mana Client
* Copyright (C) 2004-2009 The Mana World Development Team
* Copyright (C) 2009-2012 The Mana Developers
*
* This file is part of The Mana 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 "log.h"
#include <png.h>
#include <SDL.h>
#include <string>
bool ImageWriter::writePNG(SDL_Surface *surface, const std::string &filename)
{
// TODO Maybe someone can make this look nice?
png_structp png_ptr;
png_infop info_ptr;
png_bytep *row_pointers;
int colortype;
if (SDL_MUSTLOCK(surface))
SDL_LockSurface(surface);
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if (!png_ptr)
{
logger->log("Had trouble creating png_structp");
return false;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
logger->log("Could not create png_info");
return false;
}
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
logger->log("problem writing to %s", filename.c_str());
return false;
}
FILE *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);
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);
row_pointers = new png_bytep[surface->h];
if (!row_pointers)
{
logger->log("Had trouble converting surface to row pointers");
fclose(fp);
return false;
}
for (int i = 0; i < surface->h; i++)
{
row_pointers[i] = (png_bytep)(Uint8 *)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, (png_infopp)NULL);
if (SDL_MUSTLOCK(surface))
SDL_UnlockSurface(surface);
return true;
}
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