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/*
** ClanLib SDK
** Copyright (c) 1997-2005 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** Magnus Norddahl
** (if your name is missing here, please add it)
*/
#ifndef header_png_provider_generic
#define header_png_provider_generic
#if _MSC_VER > 1000
#pragma once
#endif
#include "API/Display/Providers/png_provider.h"
#include "Display/pixel_buffer_generic.h"
#include "API/Core/IOData/inputsource.h"
#include "API/Core/IOData/inputsource_provider.h"
#ifdef __APPLE__
#include <libpng/png.h>
#else
#include <png.h>
#endif
class CL_PNGProvider_Generic : public CL_PixelBuffer_Generic
{
//! Construction:
public:
CL_PNGProvider_Generic(
const std::string &name,
CL_InputSourceProvider *provider = 0);
~CL_PNGProvider_Generic();
//! Attributes:
public:
//: returns Pointer to CL_InputSource
//: (used by libpng-callback CL_PNGProvider::pngread_file() )
CL_InputSource *get_input_source() { return input_source; }
//: Returns the pitch of the image (bytes per line).
unsigned int get_pitch() const { return pitch; }
//: Returns the width of the image.
unsigned int get_width() const { return width; }
//: Returns the height of the image.
unsigned int get_height() const { return height; }
//: Returns the number of subsprites in the image.
unsigned int get_num_frames() const { return 1; }
//: Returns the transparency color used.
unsigned int get_src_colorkey() const { return trans_col; }
//: Returns whether a source colorkey is used.
bool uses_src_colorkey() const { return m_uses_src_colorkey; }
//: Returns whether the target uses an indexed color mode or not.
bool is_indexed() const;
//! Operations:
public:
//: Returns the image data. Provider must be locked before pointer is valid.
virtual void *get_data();
//: Reference counted lock function. Allocate pixel buffer in this function.
virtual void perform_lock() { return; }
//: Reference counted unlock function. Free pixel buffer in this function.
virtual void perform_unlock() { return; }
//: Loads the PNG into the pixel buffer.
virtual void init();
//: Cleans up.
virtual void deinit();
//! Implementation:
private:
//: Callback used by libpng to retrieve the filedata.
//: (calls get_input_source()->read_uchar8())
static void pngread_file(png_structp png_ptr, png_bytep data, png_size_t length);
void read_data();
void read_data_rgb();
void read_data_rgba();
void read_data_grayscale();
void read_data_grayscale_alpha();
void read_data_palette();
std::string filename;
bool m_uses_src_colorkey;
unsigned char *image;
int pitch;
int no_sprs;
int width;
int height;
int trans_col;
int color_type;
CL_InputSourceProvider *provider;
CL_InputSource *input_source;
//PNGlib stuff:
png_structp png_ptr;
png_infop info_ptr;
png_infop end_info;
};
#endif
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