/***************************************************************************** * i420_rgb8.c : YUV to bitmap RGB conversion module for vlc ***************************************************************************** * Copyright (C) 2000 VLC authors and VideoLAN * $Id$ * * Authors: Samuel Hocevar * * 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 #include #include #include "i420_rgb.h" #include "i420_rgb_c.h" static void SetOffset( int, int, int, int, bool *, int *, int * ); /***************************************************************************** * I420_RGB8: color YUV 4:2:0 to RGB 8 bpp *****************************************************************************/ void I420_RGB8( filter_t *p_filter, picture_t *p_src, picture_t *p_dest ) { /* We got this one from the old arguments */ uint8_t *p_pic = (uint8_t*)p_dest->p->p_pixels; uint8_t *p_y = p_src->Y_PIXELS; uint8_t *p_u = p_src->U_PIXELS; uint8_t *p_v = p_src->V_PIXELS; bool b_hscale; /* horizontal scaling type */ int i_vscale; /* vertical scaling type */ unsigned int i_x, i_y; /* horizontal and vertical indexes */ unsigned int i_real_y; /* y % 4 */ int i_right_margin; int i_scale_count; /* scale modulo counter */ unsigned int i_chroma_width = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 2;/* chroma width */ /* Lookup table */ uint8_t * p_lookup = p_filter->p_sys->p_base; /* Offset array pointer */ int * p_offset_start = p_filter->p_sys->p_offset; int * p_offset; const int i_source_margin = p_src->p[0].i_pitch - p_src->p[0].i_visible_pitch - p_filter->fmt_in.video.i_x_offset; const int i_source_margin_c = p_src->p[1].i_pitch - p_src->p[1].i_visible_pitch - ( p_filter->fmt_in.video.i_x_offset / 2 ); /* The dithering matrices */ static const int dither10[4] = { 0x0, 0x8, 0x2, 0xa }; static const int dither11[4] = { 0xc, 0x4, 0xe, 0x6 }; static const int dither12[4] = { 0x3, 0xb, 0x1, 0x9 }; static const int dither13[4] = { 0xf, 0x7, 0xd, 0x5 }; static const int dither20[4] = { 0x0, 0x10, 0x4, 0x14 }; static const int dither21[4] = { 0x18, 0x8, 0x1c, 0xc }; static const int dither22[4] = { 0x6, 0x16, 0x2, 0x12 }; static const int dither23[4] = { 0x1e, 0xe, 0x1a, 0xa }; SetOffset( (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width), (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height), (p_filter->fmt_out.video.i_x_offset + p_filter->fmt_out.video.i_visible_width), (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height), &b_hscale, &i_vscale, p_offset_start ); i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch; /* * Perform conversion */ i_scale_count = ( i_vscale == 1 ) ? (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height) : (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height); for( i_y = 0, i_real_y = 0; i_y < (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height); i_y++ ) { /* Do horizontal and vertical scaling */ SCALE_WIDTH_DITHER( 420 ); SCALE_HEIGHT_DITHER( 420 ); } p_y += i_source_margin; if( i_y % 2 ) { p_u += i_source_margin_c; p_v += i_source_margin_c; } } /* Following functions are local */ /***************************************************************************** * SetOffset: build offset array for conversion functions ***************************************************************************** * This function will build an offset array used in later conversion functions. * It will also set horizontal and vertical scaling indicators. The p_offset * structure has interleaved Y and U/V offsets. *****************************************************************************/ static void SetOffset( int i_width, int i_height, int i_pic_width, int i_pic_height, bool *pb_hscale, int *pi_vscale, int *p_offset ) { int i_x; /* x position in destination */ int i_scale_count; /* modulo counter */ /* * Prepare horizontal offset array */ if( i_pic_width - i_width == 0 ) { /* No horizontal scaling: YUV conversion is done directly to picture */ *pb_hscale = 0; } else if( i_pic_width - i_width > 0 ) { int i_dummy = 0; /* Prepare scaling array for horizontal extension */ *pb_hscale = 1; i_scale_count = i_pic_width; for( i_x = i_width; i_x--; ) { while( (i_scale_count -= i_width) > 0 ) { *p_offset++ = 0; *p_offset++ = 0; } *p_offset++ = 1; *p_offset++ = i_dummy; i_dummy = 1 - i_dummy; i_scale_count += i_pic_width; } } else /* if( i_pic_width - i_width < 0 ) */ { int i_remainder = 0; int i_jump; /* Prepare scaling array for horizontal reduction */ *pb_hscale = 1; i_scale_count = i_width; for( i_x = i_pic_width; i_x--; ) { i_jump = 1; while( (i_scale_count -= i_pic_width) > 0 ) { i_jump += 1; } *p_offset++ = i_jump; *p_offset++ = ( i_jump += i_remainder ) >> 1; i_remainder = i_jump & 1; i_scale_count += i_width; } } /* * Set vertical scaling indicator */ if( i_pic_height - i_height == 0 ) { *pi_vscale = 0; } else if( i_pic_height - i_height > 0 ) { *pi_vscale = 1; } else /* if( i_pic_height - i_height < 0 ) */ { *pi_vscale = -1; } }