/*****************************************************************************
 * i420_rgb.c : YUV to bitmap RGB conversion module for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2001, 2004, 2008 VLC authors and VideoLAN
 * $Id$
 *
 * Authors: Sam Hocevar <sam@zoy.org>
 *          Damien Fouilleul <damienf@videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <math.h>                                            /* exp(), pow() */

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_filter.h>
#include <vlc_picture.h>
#include <vlc_cpu.h>

#include "i420_rgb.h"
#ifdef PLAIN
# include "i420_rgb_c.h"
static picture_t *I420_RGB8_Filter( filter_t *, picture_t * );
static picture_t *I420_RGB16_Filter( filter_t *, picture_t * );
static picture_t *I420_RGB32_Filter( filter_t *, picture_t * );

static void SetGammaTable( int *pi_table, double f_gamma );
static void SetYUV( filter_t * );
static void Set8bppPalette( filter_t *, uint8_t * );
#else
static picture_t *I420_R5G5B5_Filter( filter_t *, picture_t * );
static picture_t *I420_R5G6B5_Filter( filter_t *, picture_t * );
static picture_t *I420_A8R8G8B8_Filter( filter_t *, picture_t * );
static picture_t *I420_R8G8B8A8_Filter( filter_t *, picture_t * );
static picture_t *I420_B8G8R8A8_Filter( filter_t *, picture_t * );
static picture_t *I420_A8B8G8R8_Filter( filter_t *, picture_t * );
#endif

/*****************************************************************************
 * RGB2PIXEL: assemble RGB components to a pixel value, returns a uint32_t
 *****************************************************************************/
#define RGB2PIXEL( p_filter, i_r, i_g, i_b )                 \
    (((((uint32_t)i_r) >> p_filter->fmt_out.video.i_rrshift) \
                       << p_filter->fmt_out.video.i_lrshift) \
   | ((((uint32_t)i_g) >> p_filter->fmt_out.video.i_rgshift) \
                       << p_filter->fmt_out.video.i_lgshift) \
   | ((((uint32_t)i_b) >> p_filter->fmt_out.video.i_rbshift) \
                       << p_filter->fmt_out.video.i_lbshift))

/*****************************************************************************
 * Module descriptor.
 *****************************************************************************/
static int  Activate   ( vlc_object_t * );
static void Deactivate ( vlc_object_t * );

vlc_module_begin ()
#if defined (SSE2)
    set_description( N_( "SSE2 I420,IYUV,YV12 to "
                        "RV15,RV16,RV24,RV32 conversions") )
    set_capability( "video converter", 120 )
# define vlc_CPU_capable() vlc_CPU_SSE2()
#elif defined (MMX)
    set_description( N_( "MMX I420,IYUV,YV12 to "
                        "RV15,RV16,RV24,RV32 conversions") )
    set_capability( "video converter", 100 )
# define vlc_CPU_capable() vlc_CPU_MMX()
#else
    set_description( N_("I420,IYUV,YV12 to "
                       "RGB2,RV15,RV16,RV24,RV32 conversions") )
    set_capability( "video converter", 80 )
# define vlc_CPU_capable() (true)
#endif
    set_callbacks( Activate, Deactivate )
vlc_module_end ()

/*****************************************************************************
 * Activate: allocate a chroma function
 *****************************************************************************
 * This function allocates and initializes a chroma function
 *****************************************************************************/
static int Activate( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;
#ifdef PLAIN
    size_t i_tables_size;
#endif

    if( !vlc_CPU_capable() )
        return VLC_EGENERIC;
    if( p_filter->fmt_out.video.i_width & 1
     || p_filter->fmt_out.video.i_height & 1 )
    {
        return VLC_EGENERIC;
    }

    if( p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
    {
        return VLC_EGENERIC;
    }

    switch( p_filter->fmt_in.video.i_chroma )
    {
        case VLC_CODEC_YV12:
        case VLC_CODEC_I420:
            switch( p_filter->fmt_out.video.i_chroma )
            {
#ifndef PLAIN
                case VLC_CODEC_RGB15:
                case VLC_CODEC_RGB16:
                    /* If we don't have support for the bitmasks, bail out */
                    if( ( p_filter->fmt_out.video.i_rmask == 0x7c00
                       && p_filter->fmt_out.video.i_gmask == 0x03e0
                       && p_filter->fmt_out.video.i_bmask == 0x001f ) )
                    {
                        /* R5G5B6 pixel format */
                        msg_Dbg(p_this, "RGB pixel format is R5G5B5");
                        p_filter->pf_video_filter = I420_R5G5B5_Filter;
                    }
                    else if( ( p_filter->fmt_out.video.i_rmask == 0xf800
                            && p_filter->fmt_out.video.i_gmask == 0x07e0
                            && p_filter->fmt_out.video.i_bmask == 0x001f ) )
                    {
                        /* R5G6B5 pixel format */
                        msg_Dbg(p_this, "RGB pixel format is R5G6B5");
                        p_filter->pf_video_filter = I420_R5G6B5_Filter;
                    }
                    else
                        return VLC_EGENERIC;
                    break;
                case VLC_CODEC_RGB32:
                    /* If we don't have support for the bitmasks, bail out */
                    if( p_filter->fmt_out.video.i_rmask == 0x00ff0000
                     && p_filter->fmt_out.video.i_gmask == 0x0000ff00
                     && p_filter->fmt_out.video.i_bmask == 0x000000ff )
                    {
                        /* A8R8G8B8 pixel format */
                        msg_Dbg(p_this, "RGB pixel format is A8R8G8B8");
                        p_filter->pf_video_filter = I420_A8R8G8B8_Filter;
                    }
                    else if( p_filter->fmt_out.video.i_rmask == 0xff000000
                          && p_filter->fmt_out.video.i_gmask == 0x00ff0000
                          && p_filter->fmt_out.video.i_bmask == 0x0000ff00 )
                    {
                        /* R8G8B8A8 pixel format */
                        msg_Dbg(p_this, "RGB pixel format is R8G8B8A8");
                        p_filter->pf_video_filter = I420_R8G8B8A8_Filter;
                    }
                    else if( p_filter->fmt_out.video.i_rmask == 0x0000ff00
                          && p_filter->fmt_out.video.i_gmask == 0x00ff0000
                          && p_filter->fmt_out.video.i_bmask == 0xff000000 )
                    {
                        /* B8G8R8A8 pixel format */
                        msg_Dbg(p_this, "RGB pixel format is B8G8R8A8");
                        p_filter->pf_video_filter = I420_B8G8R8A8_Filter;
                    }
                    else if( p_filter->fmt_out.video.i_rmask == 0x000000ff
                          && p_filter->fmt_out.video.i_gmask == 0x0000ff00
                          && p_filter->fmt_out.video.i_bmask == 0x00ff0000 )
                    {
                        /* A8B8G8R8 pixel format */
                        msg_Dbg(p_this, "RGB pixel format is A8B8G8R8");
                        p_filter->pf_video_filter = I420_A8B8G8R8_Filter;
                    }
                    else
                        return VLC_EGENERIC;
                    break;
#else
                case VLC_CODEC_RGB8:
                    p_filter->pf_video_filter = I420_RGB8_Filter;
                    break;
                case VLC_CODEC_RGB15:
                case VLC_CODEC_RGB16:
                    p_filter->pf_video_filter = I420_RGB16_Filter;
                    break;
                case VLC_CODEC_RGB32:
                    p_filter->pf_video_filter = I420_RGB32_Filter;
                    break;
#endif
                default:
                    return VLC_EGENERIC;
            }
            break;

        default:
            return VLC_EGENERIC;
    }

    p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
    if( p_filter->p_sys == NULL )
    {
        return VLC_EGENERIC;
    }

    switch( p_filter->fmt_out.video.i_chroma )
    {
#ifdef PLAIN
        case VLC_CODEC_RGB8:
            p_filter->p_sys->p_buffer = malloc( VOUT_MAX_WIDTH );
            break;
#endif
        case VLC_CODEC_RGB15:
        case VLC_CODEC_RGB16:
            p_filter->p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 2 );
            break;
        case VLC_CODEC_RGB24:
        case VLC_CODEC_RGB32:
            p_filter->p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 4 );
            break;
        default:
            p_filter->p_sys->p_buffer = NULL;
            break;
    }

    if( p_filter->p_sys->p_buffer == NULL )
    {
        free( p_filter->p_sys );
        return VLC_EGENERIC;
    }

    p_filter->p_sys->p_offset = malloc( p_filter->fmt_out.video.i_width
                    * ( ( p_filter->fmt_out.video.i_chroma
                           == VLC_CODEC_RGB8 ) ? 2 : 1 )
                    * sizeof( int ) );
    if( p_filter->p_sys->p_offset == NULL )
    {
        free( p_filter->p_sys->p_buffer );
        free( p_filter->p_sys );
        return VLC_EGENERIC;
    }

#ifdef PLAIN
    switch( p_filter->fmt_out.video.i_chroma )
    {
    case VLC_CODEC_RGB8:
        i_tables_size = sizeof( uint8_t ) * PALETTE_TABLE_SIZE;
        break;
    case VLC_CODEC_RGB15:
    case VLC_CODEC_RGB16:
        i_tables_size = sizeof( uint16_t ) * RGB_TABLE_SIZE;
        break;
    default: /* RV24, RV32 */
        i_tables_size = sizeof( uint32_t ) * RGB_TABLE_SIZE;
        break;
    }

    p_filter->p_sys->p_base = malloc( i_tables_size );
    if( p_filter->p_sys->p_base == NULL )
    {
        free( p_filter->p_sys->p_offset );
        free( p_filter->p_sys->p_buffer );
        free( p_filter->p_sys );
        return -1;
    }

    SetYUV( p_filter );
#endif

    return 0;
}

/*****************************************************************************
 * Deactivate: free the chroma function
 *****************************************************************************
 * This function frees the previously allocated chroma function
 *****************************************************************************/
static void Deactivate( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;

#ifdef PLAIN
    free( p_filter->p_sys->p_base );
#endif
    free( p_filter->p_sys->p_offset );
    free( p_filter->p_sys->p_buffer );
    free( p_filter->p_sys );
}

#ifndef PLAIN
VIDEO_FILTER_WRAPPER( I420_R5G5B5 )
VIDEO_FILTER_WRAPPER( I420_R5G6B5 )
VIDEO_FILTER_WRAPPER( I420_A8R8G8B8 )
VIDEO_FILTER_WRAPPER( I420_R8G8B8A8 )
VIDEO_FILTER_WRAPPER( I420_B8G8R8A8 )
VIDEO_FILTER_WRAPPER( I420_A8B8G8R8 )
#else
VIDEO_FILTER_WRAPPER( I420_RGB8 )
VIDEO_FILTER_WRAPPER( I420_RGB16 )
VIDEO_FILTER_WRAPPER( I420_RGB32 )

/*****************************************************************************
 * SetGammaTable: return intensity table transformed by gamma curve.
 *****************************************************************************
 * pi_table is a table of 256 entries from 0 to 255.
 *****************************************************************************/
static void SetGammaTable( int *pi_table, double f_gamma )
{
    int i_y;                                               /* base intensity */

    /* Use exp(gamma) instead of gamma */
    f_gamma = exp( f_gamma );

    /* Build gamma table */
    for( i_y = 0; i_y < 256; i_y++ )
    {
        pi_table[ i_y ] = (int)( pow( (double)i_y / 256, f_gamma ) * 256 );
    }
}

/*****************************************************************************
 * SetYUV: compute tables and set function pointers
 *****************************************************************************/
static void SetYUV( filter_t *p_filter )
{
    int          pi_gamma[256];                               /* gamma table */
    volatile int i_index;                                 /* index in tables */
                   /* We use volatile here to work around a strange gcc-3.3.4
                    * optimization bug */

    /* Build gamma table */
    SetGammaTable( pi_gamma, 0 ); //p_filter/*FIXME wasn't used anywhere anyway*/->f_gamma );

    /*
     * Set pointers and build YUV tables
     */

    /* Color: build red, green and blue tables */
    switch( p_filter->fmt_out.video.i_chroma )
    {
    case VLC_CODEC_RGB8:
        p_filter->p_sys->p_rgb8 = (uint8_t *)p_filter->p_sys->p_base;
        Set8bppPalette( p_filter, p_filter->p_sys->p_rgb8 );
        break;

    case VLC_CODEC_RGB15:
    case VLC_CODEC_RGB16:
        p_filter->p_sys->p_rgb16 = (uint16_t *)p_filter->p_sys->p_base;
        for( i_index = 0; i_index < RED_MARGIN; i_index++ )
        {
            p_filter->p_sys->p_rgb16[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_filter, pi_gamma[0], 0, 0 );
            p_filter->p_sys->p_rgb16[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_filter, pi_gamma[255], 0, 0 );
        }
        for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
        {
            p_filter->p_sys->p_rgb16[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_filter, 0, pi_gamma[0], 0 );
            p_filter->p_sys->p_rgb16[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_filter, 0, pi_gamma[255], 0 );
        }
        for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
        {
            p_filter->p_sys->p_rgb16[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_filter, 0, 0, pi_gamma[0] );
            p_filter->p_sys->p_rgb16[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_filter, 0, 0, pi_gamma[255] );
        }
        for( i_index = 0; i_index < 256; i_index++ )
        {
            p_filter->p_sys->p_rgb16[RED_OFFSET + i_index] =   RGB2PIXEL( p_filter, pi_gamma[ i_index ], 0, 0 );
            p_filter->p_sys->p_rgb16[GREEN_OFFSET + i_index] = RGB2PIXEL( p_filter, 0, pi_gamma[ i_index ], 0 );
            p_filter->p_sys->p_rgb16[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_filter, 0, 0, pi_gamma[ i_index ] );
        }
        break;

    case VLC_CODEC_RGB24:
    case VLC_CODEC_RGB32:
        p_filter->p_sys->p_rgb32 = (uint32_t *)p_filter->p_sys->p_base;
        for( i_index = 0; i_index < RED_MARGIN; i_index++ )
        {
            p_filter->p_sys->p_rgb32[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_filter, pi_gamma[0], 0, 0 );
            p_filter->p_sys->p_rgb32[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_filter, pi_gamma[255], 0, 0 );
        }
        for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
        {
            p_filter->p_sys->p_rgb32[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_filter, 0, pi_gamma[0], 0 );
            p_filter->p_sys->p_rgb32[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_filter, 0, pi_gamma[255], 0 );
        }
        for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
        {
            p_filter->p_sys->p_rgb32[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_filter, 0, 0, pi_gamma[0] );
            p_filter->p_sys->p_rgb32[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_filter, 0, 0, pi_gamma[255] );
        }
        for( i_index = 0; i_index < 256; i_index++ )
        {
            p_filter->p_sys->p_rgb32[RED_OFFSET + i_index] =   RGB2PIXEL( p_filter, pi_gamma[ i_index ], 0, 0 );
            p_filter->p_sys->p_rgb32[GREEN_OFFSET + i_index] = RGB2PIXEL( p_filter, 0, pi_gamma[ i_index ], 0 );
            p_filter->p_sys->p_rgb32[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_filter, 0, 0, pi_gamma[ i_index ] );
        }
        break;
    }
}

static void Set8bppPalette( filter_t *p_filter, uint8_t *p_rgb8 )
{
    #define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )

    int y,u,v;
    int r,g,b;
    int i = 0, j = 0;
    uint16_t *p_cmap_r = p_filter->p_sys->p_rgb_r;
    uint16_t *p_cmap_g = p_filter->p_sys->p_rgb_g;
    uint16_t *p_cmap_b = p_filter->p_sys->p_rgb_b;

    unsigned char p_lookup[PALETTE_TABLE_SIZE];

    /* This loop calculates the intersection of an YUV box and the RGB cube. */
    for ( y = 0; y <= 256; y += 16, i += 128 - 81 )
    {
        for ( u = 0; u <= 256; u += 32 )
        {
            for ( v = 0; v <= 256; v += 32 )
            {
                r = y + ( (V_RED_COEF*(v-128)) >> SHIFT );
                g = y + ( (U_GREEN_COEF*(u-128)
                         + V_GREEN_COEF*(v-128)) >> SHIFT );
                b = y + ( (U_BLUE_COEF*(u-128)) >> SHIFT );

                if( r >= 0x00 && g >= 0x00 && b >= 0x00
                        && r <= 0xff && g <= 0xff && b <= 0xff )
                {
                    /* This one should never happen unless someone
                     * fscked up my code */
                    if( j == 256 )
                    {
                        msg_Err( p_filter, "no colors left in palette" );
                        break;
                    }

                    /* Clip the colors */
                    p_cmap_r[ j ] = CLIP( r );
                    p_cmap_g[ j ] = CLIP( g );
                    p_cmap_b[ j ] = CLIP( b );

#if 0
            printf("+++Alloc RGB cmap %d (%d, %d, %d)\n", j,
               p_cmap_r[ j ] >>8, p_cmap_g[ j ] >>8,
               p_cmap_b[ j ] >>8);
#endif

                    /* Allocate color */
                    p_lookup[ i ] = 1;
                    p_rgb8[ i++ ] = j;
                    j++;
                }
                else
                {
                    p_lookup[ i ] = 0;
                    p_rgb8[ i++ ] = 0;
                }
            }
        }
    }

    /* The colors have been allocated, we can set the palette */
    /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
    p_filter->fmt_out.video.pf_setpalette( p_filter, p_cmap_r, p_cmap_g, p_cmap_b );*/

#if 0
    /* There will eventually be a way to know which colors
     * couldn't be allocated and try to find a replacement */
    p_vout->i_white_pixel = 0xff;
    p_vout->i_black_pixel = 0x00;
    p_vout->i_gray_pixel = 0x44;
    p_vout->i_blue_pixel = 0x3b;
#endif

    /* This loop allocates colors that got outside the RGB cube */
    for ( i = 0, y = 0; y <= 256; y += 16, i += 128 - 81 )
    {
        for ( u = 0; u <= 256; u += 32 )
        {
            for ( v = 0; v <= 256; v += 32, i++ )
            {
                int u2, v2, dist, mindist = 100000000;

                if( p_lookup[ i ] || y == 0 )
                {
                    continue;
                }

                /* Heavy. yeah. */
                for( u2 = 0; u2 <= 256; u2 += 32 )
                {
                    for( v2 = 0; v2 <= 256; v2 += 32 )
                    {
                        j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
                        dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);

                        /* Find the nearest color */
                        if( p_lookup[ j ] && dist < mindist )
                        {
                            p_rgb8[ i ] = p_rgb8[ j ];
                            mindist = dist;
                        }

                        j -= 128;

                        /* Find the nearest color */
                        if( p_lookup[ j ] && dist + 128 < mindist )
                        {
                            p_rgb8[ i ] = p_rgb8[ j ];
                            mindist = dist + 128;
                        }
                    }
                }
            }
        }
    }
}
#endif