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https://github.com/BernardoGiordano/Checkpoint
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66 lines
2.7 KiB
C
66 lines
2.7 KiB
C
///////////////////////////////////////////////////////////////////////////////
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// HEADER SECTION //
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// copy and paste this into nanojpeg.h if you want //
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _NANOJPEG_H
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#define _NANOJPEG_H
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// nj_result_t: Result codes for njDecode().
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typedef enum _nj_result {
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NJ_OK = 0, // no error, decoding successful
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NJ_NO_JPEG, // not a JPEG file
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NJ_UNSUPPORTED, // unsupported format
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NJ_OUT_OF_MEM, // out of memory
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NJ_INTERNAL_ERR, // internal error
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NJ_SYNTAX_ERROR, // syntax error
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__NJ_FINISHED, // used internally, will never be reported
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} nj_result_t;
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// njInit: Initialize NanoJPEG.
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// For safety reasons, this should be called at least one time before using
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// using any of the other NanoJPEG functions.
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void njInit(void);
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// njDecode: Decode a JPEG image.
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// Decodes a memory dump of a JPEG file into internal buffers.
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// Parameters:
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// jpeg = The pointer to the memory dump.
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// size = The size of the JPEG file.
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// Return value: The error code in case of failure, or NJ_OK (zero) on success.
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nj_result_t njDecode(const void* jpeg, const int size);
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// njGetWidth: Return the width (in pixels) of the most recently decoded
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// image. If njDecode() failed, the result of njGetWidth() is undefined.
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int njGetWidth(void);
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// njGetHeight: Return the height (in pixels) of the most recently decoded
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// image. If njDecode() failed, the result of njGetHeight() is undefined.
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int njGetHeight(void);
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// njIsColor: Return 1 if the most recently decoded image is a color image
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// (RGB) or 0 if it is a grayscale image. If njDecode() failed, the result
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// of njGetWidth() is undefined.
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int njIsColor(void);
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// njGetImage: Returns the decoded image data.
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// Returns a pointer to the most recently image. The memory layout it byte-
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// oriented, top-down, without any padding between lines. Pixels of color
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// images will be stored as three consecutive bytes for the red, green and
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// blue channels. This data format is thus compatible with the PGM or PPM
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// file formats and the OpenGL texture formats GL_LUMINANCE8 or GL_RGB8.
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// If njDecode() failed, the result of njGetImage() is undefined.
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unsigned char* njGetImage(void);
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// njGetImageSize: Returns the size (in bytes) of the image data returned
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// by njGetImage(). If njDecode() failed, the result of njGetImageSize() is
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// undefined.
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int njGetImageSize(void);
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// njDone: Uninitialize NanoJPEG.
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// Resets NanoJPEG's internal state and frees all memory that has been
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// allocated at run-time by NanoJPEG. It is still possible to decode another
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// image after a njDone() call.
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void njDone(void);
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#endif//_NANOJPEG_H
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