mirror of
https://code.videolan.org/videolan/vlc
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187 lines
6.5 KiB
C
187 lines
6.5 KiB
C
/*****************************************************************************
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* i420_rgb8.c : YUV to bitmap RGB conversion module for vlc
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*****************************************************************************
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* Copyright (C) 2000 the VideoLAN team
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* $Id$
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*
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* Authors: Samuel Hocevar <sam@zoy.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <vlc/vlc.h>
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#include <vlc_vout.h>
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#include "i420_rgb.h"
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#include "i420_rgb_c.h"
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static void SetOffset( int, int, int, int, vlc_bool_t *, int *, int * );
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/*****************************************************************************
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* I420_RGB8: color YUV 4:2:0 to RGB 8 bpp
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*****************************************************************************/
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void E_(I420_RGB8)( vout_thread_t *p_vout, picture_t *p_src, picture_t *p_dest )
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{
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/* We got this one from the old arguments */
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uint8_t *p_pic = (uint8_t*)p_dest->p->p_pixels;
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uint8_t *p_y = p_src->Y_PIXELS;
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uint8_t *p_u = p_src->U_PIXELS;
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uint8_t *p_v = p_src->V_PIXELS;
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vlc_bool_t b_hscale; /* horizontal scaling type */
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int i_vscale; /* vertical scaling type */
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unsigned int i_x, i_y; /* horizontal and vertical indexes */
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unsigned int i_real_y; /* y % 4 */
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int i_right_margin;
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int i_scale_count; /* scale modulo counter */
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unsigned int i_chroma_width = p_vout->render.i_width / 2;/* chroma width */
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/* Lookup table */
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uint8_t * p_lookup = p_vout->chroma.p_sys->p_base;
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/* Offset array pointer */
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int * p_offset_start = p_vout->chroma.p_sys->p_offset;
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int * p_offset;
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const int i_source_margin = p_src->p[0].i_pitch
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- p_src->p[0].i_visible_pitch;
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const int i_source_margin_c = p_src->p[1].i_pitch
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- p_src->p[1].i_visible_pitch;
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/* The dithering matrices */
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static int dither10[4] = { 0x0, 0x8, 0x2, 0xa };
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static int dither11[4] = { 0xc, 0x4, 0xe, 0x6 };
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static int dither12[4] = { 0x3, 0xb, 0x1, 0x9 };
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static int dither13[4] = { 0xf, 0x7, 0xd, 0x5 };
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static int dither20[4] = { 0x0, 0x10, 0x4, 0x14 };
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static int dither21[4] = { 0x18, 0x8, 0x1c, 0xc };
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static int dither22[4] = { 0x6, 0x16, 0x2, 0x12 };
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static int dither23[4] = { 0x1e, 0xe, 0x1a, 0xa };
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SetOffset( p_vout->render.i_width, p_vout->render.i_height,
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p_vout->output.i_width, p_vout->output.i_height,
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&b_hscale, &i_vscale, p_offset_start );
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i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
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/*
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* Perform conversion
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*/
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i_scale_count = ( i_vscale == 1 ) ?
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p_vout->output.i_height : p_vout->render.i_height;
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for( i_y = 0, i_real_y = 0; i_y < p_vout->render.i_height; i_y++ )
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{
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/* Do horizontal and vertical scaling */
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SCALE_WIDTH_DITHER( 420 );
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SCALE_HEIGHT_DITHER( 420 );
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}
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p_y += i_source_margin;
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if( i_y % 2 )
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{
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p_u += i_source_margin_c;
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p_v += i_source_margin_c;
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}
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}
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/* Following functions are local */
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/*****************************************************************************
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* SetOffset: build offset array for conversion functions
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*****************************************************************************
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* This function will build an offset array used in later conversion functions.
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* It will also set horizontal and vertical scaling indicators. The p_offset
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* structure has interleaved Y and U/V offsets.
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*****************************************************************************/
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static void SetOffset( int i_width, int i_height, int i_pic_width,
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int i_pic_height, vlc_bool_t *pb_hscale,
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int *pi_vscale, int *p_offset )
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{
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int i_x; /* x position in destination */
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int i_scale_count; /* modulo counter */
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/*
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* Prepare horizontal offset array
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*/
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if( i_pic_width - i_width == 0 )
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{
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/* No horizontal scaling: YUV conversion is done directly to picture */
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*pb_hscale = 0;
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}
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else if( i_pic_width - i_width > 0 )
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{
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int i_dummy = 0;
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/* Prepare scaling array for horizontal extension */
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*pb_hscale = 1;
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i_scale_count = i_pic_width;
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for( i_x = i_width; i_x--; )
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{
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while( (i_scale_count -= i_width) > 0 )
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{
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*p_offset++ = 0;
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*p_offset++ = 0;
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}
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*p_offset++ = 1;
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*p_offset++ = i_dummy;
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i_dummy = 1 - i_dummy;
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i_scale_count += i_pic_width;
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}
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}
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else /* if( i_pic_width - i_width < 0 ) */
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{
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int i_remainder = 0;
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int i_jump;
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/* Prepare scaling array for horizontal reduction */
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*pb_hscale = 1;
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i_scale_count = i_width;
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for( i_x = i_pic_width; i_x--; )
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{
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i_jump = 1;
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while( (i_scale_count -= i_pic_width) > 0 )
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{
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i_jump += 1;
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}
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*p_offset++ = i_jump;
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*p_offset++ = ( i_jump += i_remainder ) >> 1;
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i_remainder = i_jump & 1;
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i_scale_count += i_width;
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}
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}
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/*
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* Set vertical scaling indicator
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*/
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if( i_pic_height - i_height == 0 )
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{
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*pi_vscale = 0;
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}
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else if( i_pic_height - i_height > 0 )
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{
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*pi_vscale = 1;
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}
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else /* if( i_pic_height - i_height < 0 ) */
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{
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*pi_vscale = -1;
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}
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}
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