blend.c

uclinux 下的vlc播放器源代码

    i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
    p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
              p_filter->fmt_out.video.i_x_offset +
              p_dst->p[Y_PLANE].i_pitch *
              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
    p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
              p_filter->fmt_out.video.i_x_offset/2 +
              ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
              p_dst->p[U_PLANE].i_pitch;
    p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
              p_filter->fmt_out.video.i_x_offset/2 +
              ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
              p_dst->p[V_PLANE].i_pitch;

    i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
    p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
               p_filter->fmt_out.video.i_x_offset +
               p_dst_orig->p[Y_PLANE].i_pitch *
               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
    p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
               p_filter->fmt_out.video.i_x_offset/2 +
               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
               p_dst_orig->p[U_PLANE].i_pitch;
    p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
               p_filter->fmt_out.video.i_x_offset/2 +
               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
               p_dst_orig->p[V_PLANE].i_pitch;

    i_src2_pitch = p_src->p->i_pitch;
    p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
             i_src2_pitch * p_filter->fmt_in.video.i_y_offset;

#define MAX_TRANS 255
#define TRANS_BITS  8
#define p_trans p_src2
#define p_pal p_filter->fmt_in.video.p_palette->palette

    /* Draw until we reach the bottom of the subtitle */
    for( i_y = 0; i_y < i_height; i_y++,
         p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
         p_src2 += i_src2_pitch,
         p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
         p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
         p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
         p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0 )
    {
        b_even_scanline = !b_even_scanline;

        /* Draw until we reach the end of the line */
        for( i_x = 0; i_x < i_width; i_x++ )
        {
            i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
            if( !i_trans )
            {
                /* Completely transparent. Don't change pixel */
                continue;
            }
            else if( i_trans == MAX_TRANS )
            {
                /* Completely opaque. Completely overwrite underlying pixel */
                p_dst_y[i_x] = p_pal[p_src2[i_x]][0];

                if( b_even_scanline && i_x % 2 == 0 )
                {
                    p_dst_u[i_x/2] = p_pal[p_src2[i_x]][1];
                    p_dst_v[i_x/2] = p_pal[p_src2[i_x]][2];
                }
                continue;
            }

            /* Blending */
            p_dst_y[i_x] = ( (uint16_t)p_pal[p_src2[i_x]][0] * i_trans +
                (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
                >> TRANS_BITS;

            if( b_even_scanline && i_x % 2 == 0 )
            {
                p_dst_u[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][1] * i_trans +
                    (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
                    >> TRANS_BITS;
                p_dst_v[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][2] * i_trans +
                    (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
                    >> TRANS_BITS;
            }
        }
    }

#undef MAX_TRANS
#undef TRANS_BITS
#undef p_trans
#undef p_pal

    return;
}

static void BlendPalYUVPacked( filter_t *p_filter, picture_t *p_dst_pic,
                               picture_t *p_dst_orig, picture_t *p_src,
                               int i_x_offset, int i_y_offset,
                               int i_width, int i_height, int i_alpha )
{
    int i_src1_pitch, i_src2_pitch, i_dst_pitch;
    uint8_t *p_src1, *p_src2, *p_dst;
    int i_x, i_y, i_pix_pitch, i_trans;
    vlc_bool_t b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
    int i_l_offset = 0, i_u_offset = 0, i_v_offset = 0;

    if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
    {
        i_l_offset = 0;
        i_u_offset = 1;
        i_v_offset = 3;
    }
    else if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('U','Y','V','Y') )
    {
        i_l_offset = 1;
        i_u_offset = 0;
        i_v_offset = 2;
    }
    else if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','Y','U') )
    {
        i_l_offset = 0;
        i_u_offset = 3;
        i_v_offset = 1;
    }

    i_pix_pitch = 2;
    i_dst_pitch = p_dst_pic->p->i_pitch;
    p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
            p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
            ( i_y_offset + p_filter->fmt_out.video.i_y_offset );

    i_src1_pitch = p_dst_orig->p->i_pitch;
    p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
             p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );

    i_src2_pitch = p_src->p->i_pitch;
    p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
             i_src2_pitch * p_filter->fmt_in.video.i_y_offset;

    i_width = (i_width >> 1) << 1; /* Needs to be a multiple of 2 */

#define MAX_TRANS 255
#define TRANS_BITS  8
#define p_trans p_src2
#define p_pal p_filter->fmt_in.video.p_palette->palette

    /* Draw until we reach the bottom of the subtitle */
    for( i_y = 0; i_y < i_height; i_y++,
         p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
    {
        /* Draw until we reach the end of the line */
        for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
        {
            i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
            if( !i_trans )
            {
                /* Completely transparent. Don't change pixel */
            }
            else if( i_trans == MAX_TRANS )
            {
                /* Completely opaque. Completely overwrite underlying pixel */
                p_dst[i_x * 2 + i_l_offset]     = p_pal[p_src2[i_x]][0];

                if( b_even )
                {
                    if( p_trans[i_x+1] > 0xaa )
                    {
                        p_dst[i_x * 2 + i_u_offset] = (p_pal[p_src2[i_x]][1] + p_pal[p_src2[i_x+1]][1]) >> 1;
                        p_dst[i_x * 2 + i_v_offset] = (p_pal[p_src2[i_x]][2] + p_pal[p_src2[i_x+1]][2]) >> 1;
                    }
                    else
                    {
                        p_dst[i_x * 2 + i_u_offset] = p_pal[p_src2[i_x]][1];
                        p_dst[i_x * 2 + i_v_offset] = p_pal[p_src2[i_x]][2];
                    }
                }
            }
            else
            {
                /* Blending */
                p_dst[i_x * 2 + i_l_offset]     = ( (uint16_t)p_pal[p_src2[i_x]][0] *
                    i_trans + (uint16_t)p_src1[i_x * 2 + i_l_offset] *
                    (MAX_TRANS - i_trans) ) >> TRANS_BITS;

                if( b_even )
                {
                    uint16_t i_u = 0;
                    uint16_t i_v = 0;
                    if( p_trans[i_x+1] > 0xaa )
                    {
                        i_u = (p_pal[p_src2[i_x]][1] + p_pal[p_src2[i_x+1]][1]) >> 1;
                        i_v = (p_pal[p_src2[i_x]][2] + p_pal[p_src2[i_x+1]][2]) >> 1;
                    }
                    else 
                    {
                        i_u = p_pal[p_src2[i_x]][1];
                        i_v = p_pal[p_src2[i_x]][2];
                    }

                    p_dst[i_x * 2 + i_u_offset] = ( (uint16_t)i_u *
                        i_trans + (uint16_t)p_src1[i_x * 2 + i_u_offset] *
                        (MAX_TRANS - i_trans) ) >> TRANS_BITS;
                    p_dst[i_x * 2 + i_v_offset] = ( (uint16_t)i_v *
                        i_trans + (uint16_t)p_src1[i_x * 2 + i_v_offset] *
                        (MAX_TRANS - i_trans) ) >> TRANS_BITS;
                }
            }
        }
    }

#undef MAX_TRANS
#undef TRANS_BITS
#undef p_trans
#undef p_pal

    return;
}

static void BlendPalRV( filter_t *p_filter, picture_t *p_dst_pic,
                        picture_t *p_dst_orig, picture_t *p_src,
                        int i_x_offset, int i_y_offset,
                        int i_width, int i_height, int i_alpha )
{
    int i_src1_pitch, i_src2_pitch, i_dst_pitch;
    uint8_t *p_src1, *p_src2, *p_dst;
    int i_x, i_y, i_pix_pitch, i_trans;
    int r, g, b;
    video_palette_t rgbpalette;

    i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
    i_dst_pitch = p_dst_pic->p->i_pitch;
    p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
            p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
            ( i_y_offset + p_filter->fmt_out.video.i_y_offset );

    i_src1_pitch = p_dst_orig->p->i_pitch;
    p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
             p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );

    i_src2_pitch = p_src->p->i_pitch;
    p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
             i_src2_pitch * p_filter->fmt_in.video.i_y_offset;

#define MAX_TRANS 255
#define TRANS_BITS  8
#define p_trans p_src2
#define p_pal p_filter->fmt_in.video.p_palette->palette
#define rgbpal rgbpalette.palette

    /* Convert palette first */
    for( i_y = 0; i_y < p_filter->fmt_in.video.p_palette->i_entries &&
         i_y < 256; i_y++ )
    {
        yuv_to_rgb( &r, &g, &b, p_pal[i_y][0], p_pal[i_y][1], p_pal[i_y][2] );

        if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
        {
            *(uint16_t *)rgbpal[i_y] =
                ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
        }
        else
        {
            rgbpal[i_y][0] = r; rgbpal[i_y][1] = g; rgbpal[i_y][2] = b;
        }
    }

    /* Draw until we reach the bottom of the subtitle */
    for( i_y = 0; i_y < i_height; i_y++,
         p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
    {
        /* Draw until we reach the end of the line */
        for( i_x = 0; i_x < i_width; i_x++ )
        {
            i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
            if( !i_trans )
            {
                /* Completely transparent. Don't change pixel */
                continue;
            }
            else if( i_trans == MAX_TRANS ||
                     p_filter->fmt_out.video.i_chroma ==
                     VLC_FOURCC('R','V','1','6') )
            {
                /* Completely opaque. Completely overwrite underlying pixel */
                p_dst[i_x * i_pix_pitch]     = rgbpal[p_src2[i_x]][0];
                p_dst[i_x * i_pix_pitch + 1] = rgbpal[p_src2[i_x]][1];
                if( p_filter->fmt_out.video.i_chroma !=
                    VLC_FOURCC('R','V','1','6') )
                p_dst[i_x * i_pix_pitch + 2] = rgbpal[p_src2[i_x]][2];
                continue;
            }

            /* Blending */
            p_dst[i_x * i_pix_pitch]     = ( (uint16_t)rgbpal[p_src2[i_x]][0] *
                i_trans + (uint16_t)p_src1[i_x * i_pix_pitch] *
                (MAX_TRANS - i_trans) ) >> TRANS_BITS;
            p_dst[i_x * i_pix_pitch + 1] = ( (uint16_t)rgbpal[p_src2[i_x]][1] *
                i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
                (MAX_TRANS - i_trans) ) >> TRANS_BITS;
            p_dst[i_x * i_pix_pitch + 2] = ( (uint16_t)rgbpal[p_src2[i_x]][2] *
                i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
                (MAX_TRANS - i_trans) ) >> TRANS_BITS;
        }
    }

#undef MAX_TRANS
#undef TRANS_BITS
#undef p_trans
#undef p_pal
#undef rgbpal

    return;
}

/*****************************************************************************
 * CloseFilter: clean up the filter
 *****************************************************************************/
static void CloseFilter( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t*)p_this;
    filter_sys_t *p_sys = p_filter->p_sys;

    free( p_sys );
}