#ifndef STBI_INCLUDE_STB_IMAGE_H
#define STBI_INCLUDE_STB_IMAGE_H

// To get a header file for this, either cut and paste the header,
// or create stb_image.h, #define STBI_HEADER_FILE_ONLY, and
// then include stb_image.c from it.

////   begin header file  ////////////////////////////////////////////////////
//
// Limitations:
//    - no jpeg progressive support
//    - non-HDR formats support 8-bit samples only (jpeg, png)
//    - no delayed line count (jpeg) -- IJG doesn't support either
//    - no 1-bit BMP
//    - GIF always returns *comp=4
//
// Basic usage (see HDR discussion below):
//    int x,y,n;
//    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
//    // ... process data if not NULL ...
//    // ... x = width, y = height, n = # 8-bit components per pixel ...
//    // ... replace '0' with '1'..'4' to force that many components per pixel
//    // ... but 'n' will always be the number that it would have been if you said 0
//    stbi_image_free(data)
//
// Standard parameters:
//    int *x       -- outputs image width in pixels
//    int *y       -- outputs image height in pixels
//    int *comp    -- outputs # of image components in image file
//    int req_comp -- if non-zero, # of image components requested in result
//
// The return value from an image loader is an 'unsigned char *' which points
// to the pixel data. The pixel data consists of *y scanlines of *x pixels,
// with each pixel consisting of N interleaved 8-bit components; the first
// pixel pointed to is top-left-most in the image. There is no padding between
// image scanlines or between pixels, regardless of format. The number of
// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
// If req_comp is non-zero, *comp has the number of components that _would_
// have been output otherwise. E.g. if you set req_comp to 4, you will always
// get RGBA output, but you can check *comp to easily see if it's opaque.
//
// An output image with N components has the following components interleaved
// in this order in each pixel:
//
//     N=#comp     components
//       1           grey
//       2           grey, alpha
//       3           red, green, blue
//       4           red, green, blue, alpha
//
// If image loading fails for any reason, the return value will be NULL,
// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
// can be queried for an extremely brief, end-user unfriendly explanation
// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
// more user-friendly ones.
//
// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
//
// ===========================================================================
//
// iPhone PNG support:
//
// By default we convert iphone-formatted PNGs back to RGB; nominally they
// would silently load as BGR, except the existing code should have just
// failed on such iPhone PNGs. But you can disable this conversion by
// by calling stbi_convert_iphone_png_to_rgb(0), in which case
// you will always just get the native iphone "format" through.
//
// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
// pixel to remove any premultiplied alpha *only* if the image file explicitly
// says there's premultiplied data (currently only happens in iPhone images,
// and only if iPhone convert-to-rgb processing is on).
//
// ===========================================================================
//
// HDR image support   (disable by defining STBI_NO_HDR)
//
// stb_image now supports loading HDR images in general, and currently
// the Radiance .HDR file format, although the support is provided
// generically. You can still load any file through the existing interface;
// if you attempt to load an HDR file, it will be automatically remapped to
// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
// both of these constants can be reconfigured through this interface:
//
//     stbi_hdr_to_ldr_gamma(2.2f);
//     stbi_hdr_to_ldr_scale(1.0f);
//
// (note, do not use _inverse_ constants; stbi_image will invert them
// appropriately).
//
// Additionally, there is a new, parallel interface for loading files as
// (linear) floats to preserve the full dynamic range:
//
//    float *data = stbi_loadf(filename, &x, &y, &n, 0);
//
// If you load LDR images through this interface, those images will
// be promoted to floating point values, run through the inverse of
// constants corresponding to the above:
//
//     stbi_ldr_to_hdr_scale(1.0f);
//     stbi_ldr_to_hdr_gamma(2.2f);
//
// Finally, given a filename (or an open file or memory block--see header
// file for details) containing image data, you can query for the "most
// appropriate" interface to use (that is, whether the image is HDR or
// not), using:
//
//     stbi_is_hdr(char *filename);
//
// ===========================================================================
//
// I/O callbacks
//
// I/O callbacks allow you to read from arbitrary sources, like packaged
// files or some other source. Data read from callbacks are processed
// through a small internal buffer (currently 128 bytes) to try to reduce
// overhead.
//
// The three functions you must define are "read" (reads some bytes of data),
// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).


#ifndef STBI_NO_STDIO

#if defined(_MSC_VER) && _MSC_VER >= 0x1400
#define _CRT_SECURE_NO_WARNINGS // suppress bogus warnings about fopen()
#endif

#include <stdio.h>
#endif

#define STBI_VERSION 1

enum
{
	STBI_default = 0, // only used for req_comp

	STBI_grey = 1,
	STBI_grey_alpha = 2,
	STBI_rgb = 3,
	STBI_rgb_alpha = 4
};

typedef unsigned char stbi_uc;

#ifdef __cplusplus
extern "C" {
#endif

	//////////////////////////////////////////////////////////////////////////////
	//
	// PRIMARY API - works on images of any type
	//

	//
	// load image by filename, open file, or memory buffer
	//

	extern stbi_uc* stbi_load_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* comp, int req_comp);

#ifndef STBI_NO_STDIO
	extern stbi_uc* stbi_load(char const* filename, int* x, int* y, int* comp, int req_comp);
	extern stbi_uc* stbi_load_from_file(FILE* f, int* x, int* y, int* comp, int req_comp);
	// for stbi_load_from_file, file pointer is left pointing immediately after image
#endif

	typedef struct
	{
		int      (*read)  (void* user, char* data, int size);   // fill 'data' with 'size' bytes.  return number of bytes actually read
		void     (*skip)  (void* user, unsigned n);            // skip the next 'n' bytes
		int      (*eof)   (void* user);                       // returns nonzero if we are at end of file/data
	} stbi_io_callbacks;

	extern stbi_uc* stbi_load_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp, int req_comp);

#ifndef STBI_NO_HDR
	extern float* stbi_loadf_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* comp, int req_comp);

#ifndef STBI_NO_STDIO
	extern float* stbi_loadf(char const* filename, int* x, int* y, int* comp, int req_comp);
	extern float* stbi_loadf_from_file(FILE* f, int* x, int* y, int* comp, int req_comp);
#endif

	extern float* stbi_loadf_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp, int req_comp);

	extern void   stbi_hdr_to_ldr_gamma(float gamma);
	extern void   stbi_hdr_to_ldr_scale(float scale);

	extern void   stbi_ldr_to_hdr_gamma(float gamma);
	extern void   stbi_ldr_to_hdr_scale(float scale);
#endif // STBI_NO_HDR

	// stbi_is_hdr is always defined
	extern int    stbi_is_hdr_from_callbacks(stbi_io_callbacks const* clbk, void* user);
	extern int    stbi_is_hdr_from_memory(stbi_uc const* buffer, int len);
#ifndef STBI_NO_STDIO
	extern int      stbi_is_hdr(char const* filename);
	extern int      stbi_is_hdr_from_file(FILE* f);
#endif // STBI_NO_STDIO


	// get a VERY brief reason for failure
	// NOT THREADSAFE
	extern const char* stbi_failure_reason(void);

	// free the loaded image -- this is just free()
	extern void     stbi_image_free(void* retval_from_stbi_load);

	// get image dimensions & components without fully decoding
	extern int      stbi_info_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* comp);
	extern int      stbi_info_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp);

#ifndef STBI_NO_STDIO
	extern int      stbi_info(char const* filename, int* x, int* y, int* comp);
	extern int      stbi_info_from_file(FILE* f, int* x, int* y, int* comp);

#endif



	// for image formats that explicitly notate that they have premultiplied alpha,
	// we just return the colors as stored in the file. set this flag to force
	// unpremultiplication. results are undefined if the unpremultiply overflow.
	extern void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);

	// indicate whether we should process iphone images back to canonical format,
	// or just pass them through "as-is"
	extern void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);


	// ZLIB client - used by PNG, available for other purposes

	extern char* stbi_zlib_decode_malloc_guesssize(const char* buffer, int len, int initial_size, int* outlen);
	extern char* stbi_zlib_decode_malloc(const char* buffer, int len, int* outlen);
	extern int   stbi_zlib_decode_buffer(char* obuffer, int olen, const char* ibuffer, int ilen);

	extern char* stbi_zlib_decode_noheader_malloc(const char* buffer, int len, int* outlen);
	extern int   stbi_zlib_decode_noheader_buffer(char* obuffer, int olen, const char* ibuffer, int ilen);


	// define faster low-level operations (typically SIMD support)
#ifdef STBI_SIMD
	typedef void (*stbi_idct_8x8)(stbi_uc* out, int out_stride, short data[64], unsigned short* dequantize);
	// compute an integer IDCT on "input"
	//     input[x] = data[x] * dequantize[x]
	//     write results to 'out': 64 samples, each run of 8 spaced by 'out_stride'
	//                             CLAMP results to 0..255
	typedef void (*stbi_YCbCr_to_RGB_run)(stbi_uc* output, stbi_uc const* y, stbi_uc const* cb, stbi_uc const* cr, int count, int step);
	// compute a conversion from YCbCr to RGB
	//     'count' pixels
	//     write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B
	//     y: Y input channel
	//     cb: Cb input channel; scale/biased to be 0..255
	//     cr: Cr input channel; scale/biased to be 0..255

	extern void stbi_install_idct(stbi_idct_8x8 func);
	extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func);
#endif // STBI_SIMD


#ifdef __cplusplus
}
#endif

//
//
////   end header file   /////////////////////////////////////////////////////
#endif // STBI_INCLUDE_STB_IMAGE_H