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/*************************************************************************
* Copyright (C) 2009-2010 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* PNG import/export of canvases
*/
#ifndef DIMENSION_PNG_H
#define DIMENSION_PNG_H
#include <stdio.h>
/**
* Optimize a canvas for PNG exporting
* @param[in,out] canvas The canvas to optimize.
* @return Whether the canvas was successfully optimized.
*/
int dmnsn_png_optimize_canvas(dmnsn_canvas *canvas);
/**
* Write a canvas to a file in PNG format.
* @param[in] canvas The canvas to write.
* @param[in,out] file The file to write to.
* @return 0 on success, non-zero on failure.
*/
int dmnsn_png_write_canvas(const dmnsn_canvas *canvas, FILE *file);
/**
* Write a canvas to a PNG file in the background.
* @param[in] canvas The canvas to write.
* @param[in,out] file The file to write to.
* @return A \ref dmnsn_progress object, or NULL on failure.
*/
dmnsn_progress *dmnsn_png_write_canvas_async(const dmnsn_canvas *canvas,
FILE *file);
/**
* Read a canvas from a PNG file.
* @param[in,out] file The PNG file to read.
* @return The new canvas, or NULL on failure.
*/
dmnsn_canvas *dmnsn_png_read_canvas(FILE *file);
/**
* Read a canvas from a PNG file in the background.
* @param[out] canvas The address of a non-allocated canvas object. The
* canvas object will be allocated and filled with the
* contents of \p file. Do not read from this object
* until the background task has finished.
* @param[in,out] file The PNG file to read.
* @return A \ref dmnsn_progress object, or NULL on failure.
*/
dmnsn_progress *dmnsn_png_read_canvas_async(dmnsn_canvas **canvas, FILE *file);
#endif /* DIMENSION_PNG_H */
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