transform.c

VLC Player Source Code

                        p_out_end -= p_outpic->p[i_index].i_pitch
                                      - p_outpic->p[i_index].i_visible_pitch;
                        p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
                            i_pitch;

                        for( ; p_in < p_line_end ; )
                        {
                            p_line_end -= i_pitch;
                            *(--p_out_end) = *p_line_end;
                        }

                        p_in++;
                    }
                }
                else /* i_index == 1 or 2 */
                {
                    for( ; p_out < p_out_end ; )
                    {
                        uint8_t *p_line_end, *p_out_end2;

                        p_out_end -= p_outpic->p[i_index].i_pitch
                                      - p_outpic->p[i_index].i_visible_pitch;
                        p_out_end2 = p_out_end - p_outpic->p[i_index].i_pitch;
                        p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
                            i_pitch;

                        for( ; p_in < p_line_end ; )
                        {
                            uint8_t p1, p2;

                            p_line_end -= i_pitch;
                            p1 = *p_line_end;
                            p_line_end -= i_pitch;
                            p2 = *p_line_end;

                            /* Trick for (x+y)/2 without overflow, based on
                             *   x + y == (x ^ y) + 2 * (x & y) */
                            *(--p_out_end) = (p1 & p2) + ((p1 ^ p2) / 2);
                            *(--p_out_end2) = (p1 & p2) + ((p1 ^ p2) / 2);
                        }

                        p_out_end = p_out_end2;
                        p_in++;
                    }
                }
            }
            break;

        case TRANSFORM_MODE_270:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                int i_pitch = p_pic->p[i_index].i_pitch;

                uint8_t *p_in = p_pic->p[i_index].p_pixels;

                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                uint8_t *p_out_end = p_out +
                    p_outpic->p[i_index].i_visible_lines *
                    p_outpic->p[i_index].i_pitch;

                if( i_index == 0 )
                {
                    for( ; p_out < p_out_end ; )
                    {
                        uint8_t *p_in_end;

                        p_in_end = p_in + p_pic->p[i_index].i_visible_lines *
                            i_pitch;

                        for( ; p_in < p_in_end ; )
                        {
                            p_in_end -= i_pitch;
                            *p_out++ = *p_in_end;
                        }

                        p_out += p_outpic->p[i_index].i_pitch
                                  - p_outpic->p[i_index].i_visible_pitch;
                        p_in++;
                    }
                }
                else /* i_index == 1 or 2 */
                {
                    for( ; p_out < p_out_end ; )
                    {
                        uint8_t *p_in_end, *p_out2;

                        p_in_end = p_in + p_pic->p[i_index].i_visible_lines *
                            i_pitch;
                        p_out2 = p_out + p_outpic->p[i_index].i_pitch;

                        for( ; p_in < p_in_end ; )
                        {
                            uint8_t p1, p2;

                            p_in_end -= i_pitch;
                            p1 = *p_in_end;
                            p_in_end -= i_pitch;
                            p2 = *p_in_end;

                            /* Trick for (x+y)/2 without overflow, based on
                             *   x + y == (x ^ y) + 2 * (x & y) */
                            *p_out++ = (p1 & p2) + ((p1 ^ p2) / 2);
                            *p_out2++ = (p1 & p2) + ((p1 ^ p2) / 2);
                        }

                        p_out2 += p_outpic->p[i_index].i_pitch
                                   - p_outpic->p[i_index].i_visible_pitch;
                        p_out = p_out2;
                        p_in++;
                    }
                }
            }
            break;

        default:
            break;
    }
}

static void FilterYUYV( vout_thread_t *p_vout,
                        const picture_t *p_pic, picture_t *p_outpic )
{
    int i_index;
    int i_y_offset, i_u_offset, i_v_offset;
    if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
                             &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
        return;

    switch( p_vout->p_sys->i_mode )
    {
        case TRANSFORM_MODE_HFLIP:
            /* Fall back on the default implementation */
            FilterPlanar( p_vout, p_pic, p_outpic );
            return;

        case TRANSFORM_MODE_90:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                int i_pitch = p_pic->p[i_index].i_pitch;

                uint8_t *p_in = p_pic->p[i_index].p_pixels;

                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                uint8_t *p_out_end = p_out +
                    p_outpic->p[i_index].i_visible_lines *
                    p_outpic->p[i_index].i_pitch;

                int i_offset  = i_u_offset;
                int i_offset2 = i_v_offset;
                for( ; p_out < p_out_end ; )
                {
                    uint8_t *p_line_end;

                    p_out_end -= p_outpic->p[i_index].i_pitch
                                  - p_outpic->p[i_index].i_visible_pitch;
                    p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
                        i_pitch;

                    for( ; p_in < p_line_end ; )
                    {
                        p_line_end -= i_pitch;
                        p_out_end -= 4;
                        p_out_end[i_y_offset+2] = p_line_end[i_y_offset];
                        p_out_end[i_u_offset] = p_line_end[i_offset];
                        p_line_end -= i_pitch;
                        p_out_end[i_y_offset] = p_line_end[i_y_offset];
                        p_out_end[i_v_offset] = p_line_end[i_offset2];
                    }

                    p_in += 2;

                    {
                        int a = i_offset;
                        i_offset = i_offset2;
                        i_offset2 = a;
                    }
                }
            }
            break;

        case TRANSFORM_MODE_180:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                uint8_t *p_in = p_pic->p[i_index].p_pixels;
                uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
                                            * p_pic->p[i_index].i_pitch;

                uint8_t *p_out = p_outpic->p[i_index].p_pixels;

                for( ; p_in < p_in_end ; )
                {
                    uint8_t *p_line_start = p_in_end
                                             - p_pic->p[i_index].i_pitch;
                    p_in_end -= p_pic->p[i_index].i_pitch
                                 - p_pic->p[i_index].i_visible_pitch;

                    for( ; p_line_start < p_in_end ; )
                    {
                        p_in_end -= 4;
                        p_out[i_y_offset] = p_in_end[i_y_offset+2];
                        p_out[i_u_offset] = p_in_end[i_u_offset];
                        p_out[i_y_offset+2] = p_in_end[i_y_offset];
                        p_out[i_v_offset] = p_in_end[i_v_offset];
                        p_out += 4;
                    }

                    p_out += p_outpic->p[i_index].i_pitch
                              - p_outpic->p[i_index].i_visible_pitch;
                }
            }
            break;

        case TRANSFORM_MODE_270:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                int i_pitch = p_pic->p[i_index].i_pitch;

                uint8_t *p_in = p_pic->p[i_index].p_pixels;

                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                uint8_t *p_out_end = p_out +
                    p_outpic->p[i_index].i_visible_lines *
                    p_outpic->p[i_index].i_pitch;

                int i_offset  = i_u_offset;
                int i_offset2 = i_v_offset;
                for( ; p_out < p_out_end ; )
                {
                    uint8_t *p_in_end;

                    p_in_end = p_in
                             + p_pic->p[i_index].i_visible_lines * i_pitch;

                    for( ; p_in < p_in_end ; )
                    {
                        p_in_end -= i_pitch;
                        p_out[i_y_offset] = p_in_end[i_y_offset];
                        p_out[i_u_offset] = p_in_end[i_offset];
                        p_in_end -= i_pitch;
                        p_out[i_y_offset+2] = p_in_end[i_y_offset];
                        p_out[i_v_offset] = p_in_end[i_offset2];
                        p_out += 4;
                    }

                    p_out += p_outpic->p[i_index].i_pitch
                           - p_outpic->p[i_index].i_visible_pitch;
                    p_in += 2;

                    {
                        int a = i_offset;
                        i_offset = i_offset2;
                        i_offset2 = a;
                    }
                }
            }
            break;

        case TRANSFORM_MODE_VFLIP:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                uint8_t *p_in = p_pic->p[i_index].p_pixels;
                uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
                                         * p_pic->p[i_index].i_pitch;

                uint8_t *p_out = p_outpic->p[i_index].p_pixels;

                for( ; p_in < p_in_end ; )
                {
                    uint8_t *p_line_end = p_in
                                        + p_pic->p[i_index].i_visible_pitch;

                    for( ; p_in < p_line_end ; )
                    {
                        p_line_end -= 4;
                        p_out[i_y_offset] = p_line_end[i_y_offset+2];
                        p_out[i_u_offset] = p_line_end[i_u_offset];
                        p_out[i_y_offset+2] = p_line_end[i_y_offset];
                        p_out[i_v_offset] = p_line_end[i_v_offset];
                        p_out += 4;
                    }

                    p_in += p_pic->p[i_index].i_pitch;
                }
            }
            break;

        default:
            break;
    }
}