rotate.c

VLC Player Source Code

                             - i_sin * i_col_center + (1<<11) );
        int i_col_orig0 =    i_sin * i_line_center / i_aspect
                           - i_cos * i_col_center + (1<<11);
        for( ; p_outendline < p_outend;
             p_out += i_hidden_pitch, p_outendline += i_pitch,
             i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
        {
            for( ; p_out < p_outendline;
                 p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
            {
                const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
                const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
                const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
                                                + i_col_orig;
                const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
                const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;

                if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
                    && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
                {
                #define test 1
                #undef test
                #ifdef test
                    if( ( i_col_orig > i_visible_pitch/2 ) )
                #endif
                    {
                        uint8_t i_curpix = black_pixel;
                        uint8_t i_colpix = black_pixel;
                        uint8_t i_linpix = black_pixel;
                        uint8_t i_nexpix = black_pixel;
                        if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
                            i_curpix = *p_orig_offset;
                        p_orig_offset++;

                        if(  ( i_col_orig < i_visible_pitch - 1)
                             && ( i_line_orig >= 0 ) )
                            i_colpix = *p_orig_offset;

                        p_orig_offset+=i_pitch;
                        if( ( i_line_orig < i_visible_lines - 1)
                            && ( i_col_orig  < i_visible_pitch - 1) )
                            i_nexpix = *p_orig_offset;

                        p_orig_offset--;
                        if(  ( i_line_orig < i_visible_lines - 1)
                             && ( i_col_orig >= 0 ) )
                            i_linpix = *p_orig_offset;

                        unsigned int temp = 0;
                        temp+= i_curpix *
                            (256 - i_line_percent) * ( 256 - i_col_percent );
                        temp+= i_linpix *
                            i_line_percent * (256 - i_col_percent );
                        temp+= i_nexpix *
                            ( i_col_percent) * ( i_line_percent);
                        temp+= i_colpix *
                            i_col_percent * (256 - i_line_percent );
                        *p_out = temp >> 16;
                    }
                #ifdef test
                    else if (i_col_orig == i_visible_pitch/2 )
                    {   *p_out = black_pixel;
                    }
                    else
                        *p_out = *p_orig_offset;
                #endif
                #undef test
                }
                else
                {
                    *p_out = black_pixel;
                }
            }
        }
    }

    return CopyInfoAndRelease( p_outpic, p_pic );
}

/*****************************************************************************
 *
 *****************************************************************************/
static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_pic )
{
    picture_t *p_outpic;
    filter_sys_t *p_sys = p_filter->p_sys;
    const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;

    if( !p_pic ) return NULL;

    int i_u_offset, i_v_offset, i_y_offset;

    if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
                             &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
    {
        msg_Warn( p_filter, "Unsupported input chroma (%4s)",
                  (char*)&(p_pic->format.i_chroma) );
        picture_Release( p_pic );
        return NULL;
    }

    p_outpic = filter_NewPicture( p_filter );
    if( !p_outpic )
    {
        picture_Release( p_pic );
        return NULL;
    }

    const uint8_t *p_in   = p_pic->p->p_pixels+i_y_offset;
    const uint8_t *p_in_u = p_pic->p->p_pixels+i_u_offset;
    const uint8_t *p_in_v = p_pic->p->p_pixels+i_v_offset;

    const int i_pitch         = p_pic->p->i_pitch;
    const int i_visible_pitch = p_pic->p->i_visible_pitch>>1; /* In fact it's i_visible_pixels */
    const int i_visible_lines = p_pic->p->i_visible_lines;

    uint8_t *p_out   = p_outpic->p->p_pixels+i_y_offset;
    uint8_t *p_out_u = p_outpic->p->p_pixels+i_u_offset;
    uint8_t *p_out_v = p_outpic->p->p_pixels+i_v_offset;

    const int i_line_center = i_visible_lines>>1;
    const int i_col_center  = i_visible_pitch>>1;

    int i_col, i_line;
    for( i_line = 0; i_line < i_visible_lines; i_line++ )
    {
        for( i_col = 0; i_col < i_visible_pitch; i_col++ )
        {
            int i_line_orig;
            int i_col_orig;
            /* Handle "1st Y", U and V */
            i_line_orig = i_line_center +
                ( ( i_sin * ( i_col - i_col_center )
                  + i_cos * ( i_line - i_line_center ) )>>12 );
            i_col_orig = i_col_center +
                ( ( i_cos * ( i_col - i_col_center )
                  - i_sin * ( i_line - i_line_center ) )>>12 );
            if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
             && 0 <= i_line_orig && i_line_orig < i_visible_lines )
            {
                p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
                i_col_orig /= 2;
                p_out_u[i_line*i_pitch+2*i_col] = p_in_u[i_line_orig*i_pitch+4*i_col_orig];
                p_out_v[i_line*i_pitch+2*i_col] = p_in_v[i_line_orig*i_pitch+4*i_col_orig];
            }
            else
            {
                p_out[i_line*i_pitch+2*i_col] = 0x00;
                p_out_u[i_line*i_pitch+2*i_col] = 0x80;
                p_out_v[i_line*i_pitch+2*i_col] = 0x80;
            }

            /* Handle "2nd Y" */
            i_col++;
            if( i_col >= i_visible_pitch )
                break;

            i_line_orig = i_line_center +
                ( ( i_sin * ( i_col - i_col_center )
                  + i_cos * ( i_line - i_line_center ) )>>12 );
            i_col_orig = i_col_center +
                ( ( i_cos * ( i_col - i_col_center )
                  - i_sin * ( i_line - i_line_center ) )>>12 );
            if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
             && 0 <= i_line_orig && i_line_orig < i_visible_lines )
            {
                p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
            }
            else
            {
                p_out[i_line*i_pitch+2*i_col] = 0x00;
            }
        }
    }

    return CopyInfoAndRelease( p_outpic, p_pic );
}

/*****************************************************************************
 * Angle modification callbacks.
 *****************************************************************************/
static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
                           vlc_value_t oldval, vlc_value_t newval,
                           void *p_data )
{
    VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
    filter_sys_t *p_sys = (filter_sys_t *)p_data;
    p_sys->i_angle = newval.i_int*10;
    cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
    return VLC_SUCCESS;
}

static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
                           vlc_value_t oldval, vlc_value_t newval,
                           void *p_data )
{
    VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
    filter_sys_t *p_sys = (filter_sys_t *)p_data;
    p_sys->i_angle = newval.i_int;
    cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
    return VLC_SUCCESS;
}