/*
 * yuv2rgb.c, Software YUV to RGB coverter
 *
 *  Copyright (C) 1999, Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
 *  All Rights Reserved.
 *
 *  Functions broken out from display_x11.c and several new modes
 *  added by Håkan Hjort <d95hjort@dtek.chalmers.se>
 *
 *  15 & 16 bpp support by Franck Sicard <Franck.Sicard@solsoft.fr>
 *
 *  This file is part of mpeg2dec, a free MPEG-2 video decoder
 *
 *  mpeg2dec is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  mpeg2dec is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <stdio.h>
#include <stdlib.h>

#include "config.h"
#include "video_out.h"
#include "yuv2rgb.h"

uint32_t matrix_coefficients = 6;

const int32_t Inverse_Table_6_9[8][4] = {
    {117504, 138453, 13954, 34903}, /* no sequence_display_extension */
    {117504, 138453, 13954, 34903}, /* ITU-R Rec. 709 (1990) */
    {104597, 132201, 25675, 53279}, /* unspecified */
    {104597, 132201, 25675, 53279}, /* reserved */
    {104448, 132798, 24759, 53109}, /* FCC */
    {104597, 132201, 25675, 53279}, /* ITU-R Rec. 624-4 System B, G */
    {104597, 132201, 25675, 53279}, /* SMPTE 170M */
    {117579, 136230, 16907, 35559}  /* SMPTE 240M (1987) */
};

static void yuv2rgb_c_init (int bpp, int mode);

yuv2rgb_fun yuv2rgb;

static void (* yuv2rgb_c_internal) (uint8_t *, uint8_t *,
				    uint8_t *, uint8_t *,
				    void *, void *, int);

static void yuv2rgb_c (void * dst, uint8_t * py, 
		       uint8_t * pu, uint8_t * pv, 
		       int h_size, int v_size, 
		       int rgb_stride, int y_stride, int uv_stride) 
{
    v_size >>= 1;

    while (v_size--) {
	yuv2rgb_c_internal (py, py + y_stride, pu, pv, dst, dst + rgb_stride,
			    h_size);

	py += 2 * y_stride;
	pu += uv_stride;
	pv += uv_stride;
	dst += 2 * rgb_stride;
    }
}

void yuv2rgb_init (int bpp, int mode) 
{
    yuv2rgb = NULL;
#ifdef HAVE_MMX
    if (yuv2rgb == NULL /*&& (config.flags & VO_MMX_ENABLE)*/) {
        yuv2rgb = yuv2rgb_init_mmx (bpp, mode);
        if (yuv2rgb != NULL)
            fprintf (stderr, "Using MMX for colorspace transform\n");
        else
            fprintf (stderr, "Cannot init MMX colorspace transform\n");
    }
#endif
#ifdef HAVE_MLIB
    if (yuv2rgb == NULL /*&& (config.flags & VO_MLIB_ENABLE)*/) {
	yuv2rgb = yuv2rgb_init_mlib (bpp, mode);
	if (yuv2rgb != NULL)
	    fprintf (stderr, "Using mlib for colorspace transform\n");
    }
#endif
    if (yuv2rgb == NULL) {
	fprintf (stderr, "No accelerated colorspace conversion found\n");
	yuv2rgb_c_init (bpp, mode);
	yuv2rgb = (yuv2rgb_fun)yuv2rgb_c;
    }
}

void * table_rV[256];
void * table_gU[256];
int table_gV[256];
void * table_bU[256];

#define RGB(i)					\
	U = pu[i];				\
	V = pv[i];				\
	r = table_rV[V];			\
	g = table_gU[U] + table_gV[V];		\
	b = table_bU[U];

#define DST1(i)					\
	Y = py_1[2*i];				\
	dst_1[2*i] = r[Y] + g[Y] + b[Y];	\
	Y = py_1[2*i+1];			\
	dst_1[2*i+1] = r[Y] + g[Y] + b[Y];

#define DST2(i)					\
	Y = py_2[2*i];				\
	dst_2[2*i] = r[Y] + g[Y] + b[Y];	\
	Y = py_2[2*i+1];			\
	dst_2[2*i+1] = r[Y] + g[Y] + b[Y];

#define DST1RGB(i)							\
	Y = py_1[2*i];							\
	dst_1[6*i] = r[Y]; dst_1[6*i+1] = g[Y]; dst_1[6*i+2] = b[Y];	\
	Y = py_1[2*i+1];						\
	dst_1[6*i+3] = r[Y]; dst_1[6*i+4] = g[Y]; dst_1[6*i+5] = b[Y];

#define DST2RGB(i)							\
	Y = py_2[2*i];							\
	dst_2[6*i] = r[Y]; dst_2[6*i+1] = g[Y]; dst_2[6*i+2] = b[Y];	\
	Y = py_2[2*i+1];						\
	dst_2[6*i+3] = r[Y]; dst_2[6*i+4] = g[Y]; dst_2[6*i+5] = b[Y];

#define DST1BGR(i)							\
	Y = py_1[2*i];							\
	dst_1[6*i] = b[Y]; dst_1[6*i+1] = g[Y]; dst_1[6*i+2] = r[Y];	\
	Y = py_1[2*i+1];						\
	dst_1[6*i+3] = b[Y]; dst_1[6*i+4] = g[Y]; dst_1[6*i+5] = r[Y];

#define DST2BGR(i)							\
	Y = py_2[2*i];							\
	dst_2[6*i] = b[Y]; dst_2[6*i+1] = g[Y]; dst_2[6*i+2] = r[Y];	\
	Y = py_2[2*i+1];						\
	dst_2[6*i+3] = b[Y]; dst_2[6*i+4] = g[Y]; dst_2[6*i+5] = r[Y];

static void yuv2rgb_c_32 (uint8_t * py_1, uint8_t * py_2,
			  uint8_t * pu, uint8_t * pv,
			  void * _dst_1, void * _dst_2, int h_size)
{
    int U, V, Y;
    uint32_t * r, * g, * b;
    uint32_t * dst_1, * dst_2;

    h_size >>= 3;
    dst_1 = _dst_1;
    dst_2 = _dst_2;

    while (h_size--) {
	RGB(0);
	DST1(0);
	DST2(0);

	RGB(1);
	DST2(1);
	DST1(1);

	RGB(2);
	DST1(2);
	DST2(2);

	RGB(3);
	DST2(3);
	DST1(3);

	pu += 4;
	pv += 4;
	py_1 += 8;
	py_2 += 8;
	dst_1 += 8;
	dst_2 += 8;
    }
}

// This is very near from the yuv2rgb_c_32 code
static void yuv2rgb_c_24_rgb (uint8_t * py_1, uint8_t * py_2,
			      uint8_t * pu, uint8_t * pv,
			      void * _dst_1, void * _dst_2, int h_size)
{
    int U, V, Y;
    uint8_t * r, * g, * b;
    uint8_t * dst_1, * dst_2;

    h_size >>= 3;
    dst_1 = _dst_1;
    dst_2 = _dst_2;

    while (h_size--) {
	RGB(0);
	DST1RGB(0);
	DST2RGB(0);

	RGB(1);
	DST2RGB(1);
	DST1RGB(1);

	RGB(2);
	DST1RGB(2);
	DST2RGB(2);

	RGB(3);
	DST2RGB(3);
	DST1RGB(3);

	pu += 4;
	pv += 4;
	py_1 += 8;
	py_2 += 8;
	dst_1 += 24;
	dst_2 += 24;
    }
}

// only trivial mods from yuv2rgb_c_24_rgb
static void yuv2rgb_c_24_bgr (uint8_t * py_1, uint8_t * py_2,
			      uint8_t * pu, uint8_t * pv,
			      void * _dst_1, void * _dst_2, int h_size)
{
    int U, V, Y;
    uint8_t * r, * g, * b;
    uint8_t * dst_1, * dst_2;

    h_size >>= 3;
    dst_1 = _dst_1;
    dst_2 = _dst_2;

    while (h_size--) {
	RGB(0);
	DST1BGR(0);
	DST2BGR(0);

	RGB(1);
	DST2BGR(1);
	DST1BGR(1);

	RGB(2);
	DST1BGR(2);
	DST2BGR(2);

	RGB(3);
	DST2BGR(3);
	DST1BGR(3);

	pu += 4;
	pv += 4;
	py_1 += 8;
	py_2 += 8;
	dst_1 += 24;
	dst_2 += 24;
    }
}

// This is exactly the same code as yuv2rgb_c_32 except for the types of
// r, g, b, dst_1, dst_2
static void yuv2rgb_c_16 (uint8_t * py_1, uint8_t * py_2,
			  uint8_t * pu, uint8_t * pv,
			  void * _dst_1, void * _dst_2, int h_size)
{
    int U, V, Y;
    uint16_t * r, * g, * b;
    uint16_t * dst_1, * dst_2;

    h_size >>= 3;
    dst_1 = _dst_1;
    dst_2 = _dst_2;

    while (h_size--) {
	RGB(0);
	DST1(0);
	DST2(0);

	RGB(1);
	DST2(1);
	DST1(1);

	RGB(2);
	DST1(2);
	DST2(2);

	RGB(3);
	DST2(3);
	DST1(3);

	pu += 4;
	pv += 4;
	py_1 += 8;
	py_2 += 8;
	dst_1 += 8;
	dst_2 += 8;
    }
}

static int div_round (int dividend, int divisor)
{
    if (dividend > 0)
	return (dividend + (divisor>>1)) / divisor;
    else
	return -((-dividend + (divisor>>1)) / divisor);
}

static void yuv2rgb_c_init (int bpp, int mode)
{  
    int i;
    uint8_t table_Y[1024];
    uint32_t *table_32 = 0;
    uint16_t *table_16 = 0;
    uint8_t *table_8 = 0;
    uint32_t entry_size = 0;
    void *table_r = 0, *table_g = 0, *table_b = 0;

    int crv = Inverse_Table_6_9[matrix_coefficients][0];
    int cbu = Inverse_Table_6_9[matrix_coefficients][1];
    int cgu = -Inverse_Table_6_9[matrix_coefficients][2];
    int cgv = -Inverse_Table_6_9[matrix_coefficients][3];

    for (i = 0; i < 1024; i++) {
	int j;

	j = (76309 * (i - 384 - 16) + 32768) >> 16;
	j = (j < 0) ? 0 : ((j > 255) ? 255 : j);
	table_Y[i] = j;
    }

    switch (bpp) {
    case 32:
	yuv2rgb_c_internal = yuv2rgb_c_32;

	table_32 = malloc ((197 + 2*682 + 256 + 132) * sizeof (uint32_t));

	entry_size = sizeof (uint32_t);
	table_r = table_32 + 197;
	table_b = table_32 + 197 + 685;
	table_g = table_32 + 197 + 2*682;

	for (i = -197; i < 256+197; i++)
	    ((uint32_t *)table_r)[i] = table_Y[i+384] << ((mode==MODE_RGB) ? 16 : 0);
	for (i = -132; i < 256+132; i++)
	    ((uint32_t *)table_g)[i] = table_Y[i+384] << 8;
	for (i = -232; i < 256+232; i++)
	    ((uint32_t *)table_b)[i] = table_Y[i+384] << ((mode==MODE_RGB) ? 0 : 16);
	break;

    case 24:
//	yuv2rgb_c_internal = (mode==MODE_RGB) ? yuv2rgb_c_24_rgb : yuv2rgb_c_24_bgr;
	yuv2rgb_c_internal = (mode!=MODE_RGB) ? yuv2rgb_c_24_rgb : yuv2rgb_c_24_bgr;

	table_8 = malloc ((256 + 2*232) * sizeof (uint8_t));

	entry_size = sizeof (uint8_t);
	table_r = table_g = table_b = table_8 + 232;

	for (i = -232; i < 256+232; i++)
	    ((uint8_t * )table_b)[i] = table_Y[i+384];
	break;

    case 15:
    case 16:
	yuv2rgb_c_internal = yuv2rgb_c_16;

	table_16 = malloc ((197 + 2*682 + 256 + 132) * sizeof (uint16_t));

	entry_size = sizeof (uint16_t);
	table_r = table_16 + 197;
	table_b = table_16 + 197 + 685;
	table_g = table_16 + 197 + 2*682;

	for (i = -197; i < 256+197; i++) {
	    int j = table_Y[i+384] >> 3;

	    if (mode == MODE_RGB)
		j <<= ((bpp==16) ? 11 : 10);

	    ((uint16_t *)table_r)[i] = j;
	}
	for (i = -132; i < 256+132; i++) {
	    int j = table_Y[i+384] >> ((bpp==16) ? 2 : 3);

	    ((uint16_t *)table_g)[i] = j << 5;
	}
	for (i = -232; i < 256+232; i++) {
	    int j = table_Y[i+384] >> 3;

	    if (mode == MODE_BGR)
		j <<= ((bpp==16) ? 11 : 10);

	    ((uint16_t *)table_b)[i] = j;
	}
	break;

    default:
	fprintf (stderr, "%ibpp not supported by yuv2rgb\n", bpp);
	exit (1);
    }

    for (i = 0; i < 256; i++) {
	table_rV[i] = table_r + entry_size * div_round (crv * (i-128), 76309);
	table_gU[i] = table_g + entry_size * div_round (cgu * (i-128), 76309);
	table_gV[i] = entry_size * div_round (cgv * (i-128), 76309);
	table_bU[i] = table_b + entry_size * div_round (cbu * (i-128), 76309);
    }
}