/*
 * jdcolor.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1991-1997, Thomas G. Lane.
 * Modified 2011 by Guido Vollbeding.
 * libjpeg-turbo Modifications:
 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
 * Copyright (C) 2009, 2011-2012, 2014-2015, D. R. Commander.
 * Copyright (C) 2013, Linaro Limited.
 * For conditions of distribution and use, see the accompanying README.ijg
 * file.
 *
 * This file contains output colorspace conversion routines.
 */

#define JPEG_INTERNALS

#include "jinclude.h"
#include "jpeglib.h"
#include "jsimd.h"
#include "jconfigint.h"


/* Private subobject */

typedef struct {
	struct jpeg_color_deconverter pub; /* public fields */

	/* Private state for YCC->RGB conversion */
	int *Cr_r_tab;                /* => table for Cr to R conversion */
	int *Cb_b_tab;                /* => table for Cb to B conversion */
	JLONG *Cr_g_tab;              /* => table for Cr to G conversion */
	JLONG *Cb_g_tab;              /* => table for Cb to G conversion */

	/* Private state for RGB->Y conversion */
	JLONG *rgb_y_tab;             /* => table for RGB to Y conversion */
} my_color_deconverter;

typedef my_color_deconverter *my_cconvert_ptr;


/**************** YCbCr -> RGB conversion: most common case **************/
/****************   RGB -> Y   conversion: less common case **************/

/*
 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
 * The conversion equations to be implemented are therefore
 *
 *      R = Y                + 1.40200 * Cr
 *      G = Y - 0.34414 * Cb - 0.71414 * Cr
 *      B = Y + 1.77200 * Cb
 *
 *      Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
 *
 * where Cb and Cr represent the incoming values less CENTERJSAMPLE.
 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
 *
 * To avoid floating-point arithmetic, we represent the fractional constants
 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
 * the products by 2^16, with appropriate rounding, to get the correct answer.
 * Notice that Y, being an integral input, does not contribute any fraction
 * so it need not participate in the rounding.
 *
 * For even more speed, we avoid doing any multiplications in the inner loop
 * by precalculating the constants times Cb and Cr for all possible values.
 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
 * for 12-bit samples it is still acceptable.  It's not very reasonable for
 * 16-bit samples, but if you want lossless storage you shouldn't be changing
 * colorspace anyway.
 * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
 * values for the G calculation are left scaled up, since we must add them
 * together before rounding.
 */

#define SCALEBITS       16      /* speediest right-shift on some machines */
#define ONE_HALF        ((JLONG) 1 << (SCALEBITS-1))
#define FIX(x)          ((JLONG) ((x) * (1L<<SCALEBITS) + 0.5))

/* We allocate one big table for RGB->Y conversion and divide it up into
 * three parts, instead of doing three alloc_small requests.  This lets us
 * use a single table base address, which can be held in a register in the
 * inner loops on many machines (more than can hold all three addresses,
 * anyway).
 */

#define R_Y_OFF         0                       /* offset to R => Y section */
#define G_Y_OFF         (1*(MAXJSAMPLE+1))      /* offset to G => Y section */
#define B_Y_OFF         (2*(MAXJSAMPLE+1))      /* etc. */
#define TABLE_SIZE      (3*(MAXJSAMPLE+1))


/* Include inline routines for colorspace extensions */

#include "jdcolext.c"

#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_PIXELSIZE

#define RGB_RED EXT_RGB_RED
#define RGB_GREEN EXT_RGB_GREEN
#define RGB_BLUE EXT_RGB_BLUE
#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
#define ycc_rgb_convert_internal ycc_extrgb_convert_internal
#define gray_rgb_convert_internal gray_extrgb_convert_internal
#define rgb_rgb_convert_internal rgb_extrgb_convert_internal

#include "jdcolext.c"

#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_PIXELSIZE
#undef ycc_rgb_convert_internal
#undef gray_rgb_convert_internal
#undef rgb_rgb_convert_internal

#define RGB_RED EXT_RGBX_RED
#define RGB_GREEN EXT_RGBX_GREEN
#define RGB_BLUE EXT_RGBX_BLUE
#define RGB_ALPHA 3
#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
#define ycc_rgb_convert_internal ycc_extrgbx_convert_internal
#define gray_rgb_convert_internal gray_extrgbx_convert_internal
#define rgb_rgb_convert_internal rgb_extrgbx_convert_internal

#include "jdcolext.c"

#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef ycc_rgb_convert_internal
#undef gray_rgb_convert_internal
#undef rgb_rgb_convert_internal

#define RGB_RED EXT_BGR_RED
#define RGB_GREEN EXT_BGR_GREEN
#define RGB_BLUE EXT_BGR_BLUE
#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
#define ycc_rgb_convert_internal ycc_extbgr_convert_internal
#define gray_rgb_convert_internal gray_extbgr_convert_internal
#define rgb_rgb_convert_internal rgb_extbgr_convert_internal

#include "jdcolext.c"

#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_PIXELSIZE
#undef ycc_rgb_convert_internal
#undef gray_rgb_convert_internal
#undef rgb_rgb_convert_internal

#define RGB_RED EXT_BGRX_RED
#define RGB_GREEN EXT_BGRX_GREEN
#define RGB_BLUE EXT_BGRX_BLUE
#define RGB_ALPHA 3
#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
#define ycc_rgb_convert_internal ycc_extbgrx_convert_internal
#define gray_rgb_convert_internal gray_extbgrx_convert_internal
#define rgb_rgb_convert_internal rgb_extbgrx_convert_internal

#include "jdcolext.c"

#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef ycc_rgb_convert_internal
#undef gray_rgb_convert_internal
#undef rgb_rgb_convert_internal

#define RGB_RED EXT_XBGR_RED
#define RGB_GREEN EXT_XBGR_GREEN
#define RGB_BLUE EXT_XBGR_BLUE
#define RGB_ALPHA 0
#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
#define ycc_rgb_convert_internal ycc_extxbgr_convert_internal
#define gray_rgb_convert_internal gray_extxbgr_convert_internal
#define rgb_rgb_convert_internal rgb_extxbgr_convert_internal

#include "jdcolext.c"

#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef ycc_rgb_convert_internal
#undef gray_rgb_convert_internal
#undef rgb_rgb_convert_internal

#define RGB_RED EXT_XRGB_RED
#define RGB_GREEN EXT_XRGB_GREEN
#define RGB_BLUE EXT_XRGB_BLUE
#define RGB_ALPHA 0
#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
#define ycc_rgb_convert_internal ycc_extxrgb_convert_internal
#define gray_rgb_convert_internal gray_extxrgb_convert_internal
#define rgb_rgb_convert_internal rgb_extxrgb_convert_internal

#include "jdcolext.c"

#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef ycc_rgb_convert_internal
#undef gray_rgb_convert_internal
#undef rgb_rgb_convert_internal


/*
 * Initialize tables for YCC->RGB colorspace conversion.
 */

LOCAL(void)
build_ycc_rgb_table(j_decompress_ptr cinfo) {
	my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
	int i;
	JLONG x;
	SHIFT_TEMPS

	cconvert->Cr_r_tab = (int *)
			(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_IMAGE,
			                           (MAXJSAMPLE + 1) * sizeof(int));
	cconvert->Cb_b_tab = (int *)
			(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_IMAGE,
			                           (MAXJSAMPLE + 1) * sizeof(int));
	cconvert->Cr_g_tab = (JLONG *)
			(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_IMAGE,
			                           (MAXJSAMPLE + 1) * sizeof(JLONG));
	cconvert->Cb_g_tab = (JLONG *)
			(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_IMAGE,
			                           (MAXJSAMPLE + 1) * sizeof(JLONG));

	for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
		/* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
		/* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
		/* Cr=>R value is nearest int to 1.40200 * x */
		cconvert->Cr_r_tab[i] = (int)
				RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
		/* Cb=>B value is nearest int to 1.77200 * x */
		cconvert->Cb_b_tab[i] = (int)
				RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
		/* Cr=>G value is scaled-up -0.71414 * x */
		cconvert->Cr_g_tab[i] = (-FIX(0.71414)) * x;
		/* Cb=>G value is scaled-up -0.34414 * x */
		/* We also add in ONE_HALF so that need not do it in inner loop */
		cconvert->Cb_g_tab[i] = (-FIX(0.34414)) * x + ONE_HALF;
	}
}


/*
 * Convert some rows of samples to the output colorspace.
 */

METHODDEF(void)
ycc_rgb_convert(j_decompress_ptr cinfo,
                JSAMPIMAGE input_buf, JDIMENSION input_row,
                JSAMPARRAY output_buf, int num_rows) {
	switch (cinfo->out_color_space) {
		case JCS_EXT_RGB:
			ycc_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                            num_rows);
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			ycc_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_BGR:
			ycc_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
			                            num_rows);
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			ycc_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			ycc_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			ycc_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		default:
			ycc_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                         num_rows);
			break;
	}
}


/**************** Cases other than YCbCr -> RGB **************/


/*
 * Initialize for RGB->grayscale colorspace conversion.
 */

LOCAL(void)
build_rgb_y_table(j_decompress_ptr cinfo) {
	my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
	JLONG *rgb_y_tab;
	JLONG i;

	/* Allocate and fill in the conversion tables. */
	cconvert->rgb_y_tab = rgb_y_tab = (JLONG *)
			(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_IMAGE,
			                           (TABLE_SIZE * sizeof(JLONG)));

	for (i = 0; i <= MAXJSAMPLE; i++) {
		rgb_y_tab[i + R_Y_OFF] = FIX(0.29900) * i;
		rgb_y_tab[i + G_Y_OFF] = FIX(0.58700) * i;
		rgb_y_tab[i + B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
	}
}


/*
 * Convert RGB to grayscale.
 */

METHODDEF(void)
rgb_gray_convert(j_decompress_ptr cinfo,
                 JSAMPIMAGE input_buf, JDIMENSION input_row,
                 JSAMPARRAY output_buf, int num_rows) {
	my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
	register int r, g, b;
	register JLONG *ctab = cconvert->rgb_y_tab;
	register JSAMPROW outptr;
	register JSAMPROW inptr0, inptr1, inptr2;
	register JDIMENSION col;
	JDIMENSION num_cols = cinfo->output_width;

	while (--num_rows >= 0) {
		inptr0 = input_buf[0][input_row];
		inptr1 = input_buf[1][input_row];
		inptr2 = input_buf[2][input_row];
		input_row++;
		outptr = *output_buf++;
		for (col = 0; col < num_cols; col++) {
			r = GETJSAMPLE(inptr0[col]);
			g = GETJSAMPLE(inptr1[col]);
			b = GETJSAMPLE(inptr2[col]);
			/* Y */
			outptr[col] = (JSAMPLE)
					((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] + ctab[b + B_Y_OFF])
							 >> SCALEBITS);
		}
	}
}


/*
 * Color conversion for no colorspace change: just copy the data,
 * converting from separate-planes to interleaved representation.
 */

METHODDEF(void)
null_convert(j_decompress_ptr cinfo,
             JSAMPIMAGE input_buf, JDIMENSION input_row,
             JSAMPARRAY output_buf, int num_rows) {
	register JSAMPROW inptr, inptr0, inptr1, inptr2, inptr3, outptr;
	register JDIMENSION col;
	register int num_components = cinfo->num_components;
	JDIMENSION num_cols = cinfo->output_width;
	int ci;

	if (num_components == 3) {
		while (--num_rows >= 0) {
			inptr0 = input_buf[0][input_row];
			inptr1 = input_buf[1][input_row];
			inptr2 = input_buf[2][input_row];
			input_row++;
			outptr = *output_buf++;
			for (col = 0; col < num_cols; col++) {
				*outptr++ = inptr0[col];
				*outptr++ = inptr1[col];
				*outptr++ = inptr2[col];
			}
		}
	} else if (num_components == 4) {
		while (--num_rows >= 0) {
			inptr0 = input_buf[0][input_row];
			inptr1 = input_buf[1][input_row];
			inptr2 = input_buf[2][input_row];
			inptr3 = input_buf[3][input_row];
			input_row++;
			outptr = *output_buf++;
			for (col = 0; col < num_cols; col++) {
				*outptr++ = inptr0[col];
				*outptr++ = inptr1[col];
				*outptr++ = inptr2[col];
				*outptr++ = inptr3[col];
			}
		}
	} else {
		while (--num_rows >= 0) {
			for (ci = 0; ci < num_components; ci++) {
				inptr = input_buf[ci][input_row];
				outptr = *output_buf;
				for (col = 0; col < num_cols; col++) {
					outptr[ci] = inptr[col];
					outptr += num_components;
				}
			}
			output_buf++;
			input_row++;
		}
	}
}


/*
 * Color conversion for grayscale: just copy the data.
 * This also works for YCbCr -> grayscale conversion, in which
 * we just copy the Y (luminance) component and ignore chrominance.
 */

METHODDEF(void)
grayscale_convert(j_decompress_ptr cinfo,
                  JSAMPIMAGE input_buf, JDIMENSION input_row,
                  JSAMPARRAY output_buf, int num_rows) {
	jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
	                  num_rows, cinfo->output_width);
}


/*
 * Convert grayscale to RGB
 */

METHODDEF(void)
gray_rgb_convert(j_decompress_ptr cinfo,
                 JSAMPIMAGE input_buf, JDIMENSION input_row,
                 JSAMPARRAY output_buf, int num_rows) {
	switch (cinfo->out_color_space) {
		case JCS_EXT_RGB:
			gray_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			gray_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
			                              num_rows);
			break;
		case JCS_EXT_BGR:
			gray_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			gray_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
			                              num_rows);
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			gray_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
			                              num_rows);
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			gray_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                              num_rows);
			break;
		default:
			gray_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                          num_rows);
			break;
	}
}


/*
 * Convert plain RGB to extended RGB
 */

METHODDEF(void)
rgb_rgb_convert(j_decompress_ptr cinfo,
                JSAMPIMAGE input_buf, JDIMENSION input_row,
                JSAMPARRAY output_buf, int num_rows) {
	switch (cinfo->out_color_space) {
		case JCS_EXT_RGB:
			rgb_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                            num_rows);
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			rgb_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_BGR:
			rgb_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
			                            num_rows);
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			rgb_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			rgb_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			rgb_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                             num_rows);
			break;
		default:
			rgb_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
			                         num_rows);
			break;
	}
}


/*
 * Adobe-style YCCK->CMYK conversion.
 * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
 * conversion as above, while passing K (black) unchanged.
 * We assume build_ycc_rgb_table has been called.
 */

METHODDEF(void)
ycck_cmyk_convert(j_decompress_ptr cinfo,
                  JSAMPIMAGE input_buf, JDIMENSION input_row,
                  JSAMPARRAY output_buf, int num_rows) {
	my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
	register int y, cb, cr;
	register JSAMPROW outptr;
	register JSAMPROW inptr0, inptr1, inptr2, inptr3;
	register JDIMENSION col;
	JDIMENSION num_cols = cinfo->output_width;
	/* copy these pointers into registers if possible */
	register JSAMPLE *range_limit = cinfo->sample_range_limit;
	register int *Crrtab = cconvert->Cr_r_tab;
	register int *Cbbtab = cconvert->Cb_b_tab;
	register JLONG *Crgtab = cconvert->Cr_g_tab;
	register JLONG *Cbgtab = cconvert->Cb_g_tab;
	SHIFT_TEMPS

	while (--num_rows >= 0) {
		inptr0 = input_buf[0][input_row];
		inptr1 = input_buf[1][input_row];
		inptr2 = input_buf[2][input_row];
		inptr3 = input_buf[3][input_row];
		input_row++;
		outptr = *output_buf++;
		for (col = 0; col < num_cols; col++) {
			y = GETJSAMPLE(inptr0[col]);
			cb = GETJSAMPLE(inptr1[col]);
			cr = GETJSAMPLE(inptr2[col]);
			/* Range-limiting is essential due to noise introduced by DCT losses. */
			outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])];   /* red */
			outptr[1] = range_limit[MAXJSAMPLE - (y +                 /* green */
			                                      ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
			                                                         SCALEBITS)))];
			outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])];   /* blue */
			/* K passes through unchanged */
			outptr[3] = inptr3[col];  /* don't need GETJSAMPLE here */
			outptr += 4;
		}
	}
}


/*
 * RGB565 conversion
 */

#define PACK_SHORT_565_LE(r, g, b)   ((((r) << 8) & 0xF800) |  \
                                      (((g) << 3) & 0x7E0) | ((b) >> 3))
#define PACK_SHORT_565_BE(r, g, b)   (((r) & 0xF8) | ((g) >> 5) |  \
                                      (((g) << 11) & 0xE000) |  \
                                      (((b) << 5) & 0x1F00))

#define PACK_TWO_PIXELS_LE(l, r)     ((r << 16) | l)
#define PACK_TWO_PIXELS_BE(l, r)     ((l << 16) | r)

#define PACK_NEED_ALIGNMENT(ptr)     (((size_t)(ptr)) & 3)

#define WRITE_TWO_ALIGNED_PIXELS(addr, pixels)  ((*(int *)(addr)) = pixels)

#define DITHER_565_R(r, dither)  ((r) + ((dither) & 0xFF))
#define DITHER_565_G(g, dither)  ((g) + (((dither) & 0xFF) >> 1))
#define DITHER_565_B(b, dither)  ((b) + ((dither) & 0xFF))


/* Declarations for ordered dithering
 *
 * We use a 4x4 ordered dither array packed into 32 bits.  This array is
 * sufficent for dithering RGB888 to RGB565.
 */

#define DITHER_MASK       0x3
#define DITHER_ROTATE(x)  ((((x) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF))
static const JLONG dither_matrix[4] = {
		0x0008020A,
		0x0C040E06,
		0x030B0109,
		0x0F070D05
};


static INLINE boolean

is_big_endian(void) {
	int test_value = 1;
	if (*(char *) &test_value != 1)
		return TRUE;
	return FALSE;
}


/* Include inline routines for RGB565 conversion */

#define PACK_SHORT_565 PACK_SHORT_565_LE
#define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
#define ycc_rgb565_convert_internal ycc_rgb565_convert_le
#define ycc_rgb565D_convert_internal ycc_rgb565D_convert_le
#define rgb_rgb565_convert_internal rgb_rgb565_convert_le
#define rgb_rgb565D_convert_internal rgb_rgb565D_convert_le
#define gray_rgb565_convert_internal gray_rgb565_convert_le
#define gray_rgb565D_convert_internal gray_rgb565D_convert_le

#include "jdcol565.c"

#undef PACK_SHORT_565
#undef PACK_TWO_PIXELS
#undef ycc_rgb565_convert_internal
#undef ycc_rgb565D_convert_internal
#undef rgb_rgb565_convert_internal
#undef rgb_rgb565D_convert_internal
#undef gray_rgb565_convert_internal
#undef gray_rgb565D_convert_internal

#define PACK_SHORT_565 PACK_SHORT_565_BE
#define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
#define ycc_rgb565_convert_internal ycc_rgb565_convert_be
#define ycc_rgb565D_convert_internal ycc_rgb565D_convert_be
#define rgb_rgb565_convert_internal rgb_rgb565_convert_be
#define rgb_rgb565D_convert_internal rgb_rgb565D_convert_be
#define gray_rgb565_convert_internal gray_rgb565_convert_be
#define gray_rgb565D_convert_internal gray_rgb565D_convert_be

#include "jdcol565.c"

#undef PACK_SHORT_565
#undef PACK_TWO_PIXELS
#undef ycc_rgb565_convert_internal
#undef ycc_rgb565D_convert_internal
#undef rgb_rgb565_convert_internal
#undef rgb_rgb565D_convert_internal
#undef gray_rgb565_convert_internal
#undef gray_rgb565D_convert_internal


METHODDEF(void)
ycc_rgb565_convert(j_decompress_ptr cinfo,
                   JSAMPIMAGE input_buf, JDIMENSION input_row,
                   JSAMPARRAY output_buf, int num_rows) {
	if (is_big_endian())
		ycc_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
	else
		ycc_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
}


METHODDEF(void)
ycc_rgb565D_convert(j_decompress_ptr cinfo,
                    JSAMPIMAGE input_buf, JDIMENSION input_row,
                    JSAMPARRAY output_buf, int num_rows) {
	if (is_big_endian())
		ycc_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
	else
		ycc_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
}


METHODDEF(void)
rgb_rgb565_convert(j_decompress_ptr cinfo,
                   JSAMPIMAGE input_buf, JDIMENSION input_row,
                   JSAMPARRAY output_buf, int num_rows) {
	if (is_big_endian())
		rgb_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
	else
		rgb_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
}


METHODDEF(void)
rgb_rgb565D_convert(j_decompress_ptr cinfo,
                    JSAMPIMAGE input_buf, JDIMENSION input_row,
                    JSAMPARRAY output_buf, int num_rows) {
	if (is_big_endian())
		rgb_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
	else
		rgb_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
}


METHODDEF(void)
gray_rgb565_convert(j_decompress_ptr cinfo,
                    JSAMPIMAGE input_buf, JDIMENSION input_row,
                    JSAMPARRAY output_buf, int num_rows) {
	if (is_big_endian())
		gray_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
	else
		gray_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
}


METHODDEF(void)
gray_rgb565D_convert(j_decompress_ptr cinfo,
                     JSAMPIMAGE input_buf, JDIMENSION input_row,
                     JSAMPARRAY output_buf, int num_rows) {
	if (is_big_endian())
		gray_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
	else
		gray_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
}


/*
 * Empty method for start_pass.
 */

METHODDEF(void)
start_pass_dcolor(j_decompress_ptr cinfo) {
	/* no work needed */
}


/*
 * Module initialization routine for output colorspace conversion.
 */

GLOBAL(void)
jinit_color_deconverter(j_decompress_ptr cinfo) {
	my_cconvert_ptr cconvert;
	int ci;

	cconvert = (my_cconvert_ptr)
			(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_IMAGE,
			                           sizeof(my_color_deconverter));
	cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
	cconvert->pub.start_pass = start_pass_dcolor;

	/* Make sure num_components agrees with jpeg_color_space */
	switch (cinfo->jpeg_color_space) {
		case JCS_GRAYSCALE:
			if (cinfo->num_components != 1)
				ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
			break;

		case JCS_RGB:
		case JCS_YCbCr:
			if (cinfo->num_components != 3)
				ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
			break;

		case JCS_CMYK:
		case JCS_YCCK:
			if (cinfo->num_components != 4)
				ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
			break;

		default:                      /* JCS_UNKNOWN can be anything */
			if (cinfo->num_components < 1)
				ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
			break;
	}

	/* Set out_color_components and conversion method based on requested space.
	 * Also clear the component_needed flags for any unused components,
	 * so that earlier pipeline stages can avoid useless computation.
	 */

	switch (cinfo->out_color_space) {
		case JCS_GRAYSCALE:
			cinfo->out_color_components = 1;
			if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
			    cinfo->jpeg_color_space == JCS_YCbCr) {
				cconvert->pub.color_convert = grayscale_convert;
				/* For color->grayscale conversion, only the Y (0) component is needed */
				for (ci = 1; ci < cinfo->num_components; ci++)
					cinfo->comp_info[ci].component_needed = FALSE;
			} else if (cinfo->jpeg_color_space == JCS_RGB) {
				cconvert->pub.color_convert = rgb_gray_convert;
				build_rgb_y_table(cinfo);
			} else
				ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
			break;

		case JCS_RGB:
		case JCS_EXT_RGB:
		case JCS_EXT_RGBX:
		case JCS_EXT_BGR:
		case JCS_EXT_BGRX:
		case JCS_EXT_XBGR:
		case JCS_EXT_XRGB:
		case JCS_EXT_RGBA:
		case JCS_EXT_BGRA:
		case JCS_EXT_ABGR:
		case JCS_EXT_ARGB:
			cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space];
			if (cinfo->jpeg_color_space == JCS_YCbCr) {
				if (jsimd_can_ycc_rgb())
					cconvert->pub.color_convert = jsimd_ycc_rgb_convert;
				else {
					cconvert->pub.color_convert = ycc_rgb_convert;
					build_ycc_rgb_table(cinfo);
				}
			} else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
				cconvert->pub.color_convert = gray_rgb_convert;
			} else if (cinfo->jpeg_color_space == JCS_RGB) {
				if (rgb_red[cinfo->out_color_space] == 0 &&
				    rgb_green[cinfo->out_color_space] == 1 &&
				    rgb_blue[cinfo->out_color_space] == 2 &&
				    rgb_pixelsize[cinfo->out_color_space] == 3)
					cconvert->pub.color_convert = null_convert;
				else
					cconvert->pub.color_convert = rgb_rgb_convert;
			} else
				ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
			break;

		case JCS_RGB565:
			cinfo->out_color_components = 3;
			if (cinfo->dither_mode == JDITHER_NONE) {
				if (cinfo->jpeg_color_space == JCS_YCbCr) {
					if (jsimd_can_ycc_rgb565())
						cconvert->pub.color_convert = jsimd_ycc_rgb565_convert;
					else {
						cconvert->pub.color_convert = ycc_rgb565_convert;
						build_ycc_rgb_table(cinfo);
					}
				} else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
					cconvert->pub.color_convert = gray_rgb565_convert;
				} else if (cinfo->jpeg_color_space == JCS_RGB) {
					cconvert->pub.color_convert = rgb_rgb565_convert;
				} else
					ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
			} else {
				/* only ordered dithering is supported */
				if (cinfo->jpeg_color_space == JCS_YCbCr) {
					cconvert->pub.color_convert = ycc_rgb565D_convert;
					build_ycc_rgb_table(cinfo);
				} else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
					cconvert->pub.color_convert = gray_rgb565D_convert;
				} else if (cinfo->jpeg_color_space == JCS_RGB) {
					cconvert->pub.color_convert = rgb_rgb565D_convert;
				} else
					ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
			}
			break;

		case JCS_CMYK:
			cinfo->out_color_components = 4;
			if (cinfo->jpeg_color_space == JCS_YCCK) {
				cconvert->pub.color_convert = ycck_cmyk_convert;
				build_ycc_rgb_table(cinfo);
			} else if (cinfo->jpeg_color_space == JCS_CMYK) {
				cconvert->pub.color_convert = null_convert;
			} else
				ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
			break;

		default:
			/* Permit null conversion to same output space */
			if (cinfo->out_color_space == cinfo->jpeg_color_space) {
				cinfo->out_color_components = cinfo->num_components;
				cconvert->pub.color_convert = null_convert;
			} else                      /* unsupported non-null conversion */
				ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
			break;
	}

	if (cinfo->quantize_colors)
		cinfo->output_components = 1; /* single colormapped output component */
	else
		cinfo->output_components = cinfo->out_color_components;
}
