gif_data.h

ucOS 模拟环境

#define RIGHT_SHIFT(x,shft)	((x) >> (shft))
#define METHODDEF static	/* a function called through method pointers */
#define LOCAL	  static	/* a function used only in its module */
#define GLOBAL			/* a function referenced thru EXTERNs */
#ifdef __cplusplus
#define EXTERN	  extern "C"	/* a reference to a GLOBAL function */
#else
#define EXTERN	  extern	/* a reference to a GLOBAL function */
#endif

/* Here is the pseudo-keyword for declaring pointers that must be "far"
 * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
 * by just saying "FAR *" where such a pointer is needed.  In a few places
 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
 */

#ifdef NEED_FAR_POINTERS
#define FAR  far
#else
#define FAR
#endif

/* Data structures for images containing either samples or coefficients. */
/* Note that the topmost (leftmost) index is always color component. */
/* On 80x86 machines, the image arrays are too big for near pointers, */
/* but the pointer arrays can fit in near memory. */

typedef JSAMPLE FAR *JSAMPROW;	/* ptr to one image row of pixel samples. */
typedef JSAMPROW *JSAMPARRAY;	/* ptr to some rows (a 2-D sample array) */
typedef JSAMPARRAY *JSAMPIMAGE;	/* a 3-D sample array: top index is color */

/* Working data for compression */
typedef unsigned int JDIMENSION;
typedef enum {
	GIF_UNKNOWN,		/* error/unspecified */
	GIF_GRAYSCALE,		/* monochrome */
	GIF_RGB,		/* red/green/blue */
	GIF_YCbCr,		/* Y/Cb/Cr (also known as YUV) */
	GIF_CMYK,		/* C/M/Y/K */
	GIF_YCCK		/* Y/Cb/Cr/K */
} GIF_COLOR_SPACE;

struct Decompress_info_struct {
	JDIMENSION image_width;	/* nominal image width (from SOF marker) */
	unsigned int image_height;	/* nominal image height */
	int num_components;		/* # of color components in JPEG image */
	GIF_COLOR_SPACE out_color_space; /* colorspace for output */
	boolean quantize_colors;	/* TRUE=colormapped output wanted */
	boolean enable_2pass_quant;
	/* the following are ignored if not quantize_colors: */
	uchar dither_mode;	/* type of color dithering to use */
	int desired_number_of_colors;	/* max # colors to use in created colormap */
	JDIMENSION output_width;	/* scaled image width */
	JDIMENSION output_height;	/* scaled image height */
	int out_color_components;	/* # of color components in out_color_space */
	int output_components;	/* # of color components returned */
	int actual_number_of_colors;	/* number of entries in use */
	JSAMPARRAY colormap;		/* The color map as a 2-D pixel array */
	JSAMPLE * sample_range_limit; /* table for fast range-limiting */
	void * cquantize;
};
typedef struct Decompress_info_struct * decompress_info_ptr;