i420_rgb.h
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上传日期：2009-03-27
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- /*****************************************************************************
- * i420_rgb.h : YUV to bitmap RGB conversion module for vlc
- *****************************************************************************
- * Copyright (C) 2000, 2004 VideoLAN
- * $Id: i420_rgb.h 7194 2004-03-29 19:57:07Z fenrir $
- *
- * Authors: Samuel Hocevar <sam@zoy.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- /** Number of entries in RGB palette/colormap */
- #define CMAP_RGB2_SIZE 256
- /**
- * chroma_sys_t: chroma method descriptor
- * This structure is part of the chroma transformation descriptor, it
- * describes the yuv2rgb specific properties.
- */
- struct chroma_sys_t
- {
- uint8_t *p_buffer;
- int *p_offset;
- #ifdef MODULE_NAME_IS_i420_rgb
- /**< Pre-calculated conversion tables */
- void *p_base; /**< base for all conversion tables */
- uint8_t *p_rgb8; /**< RGB 8 bits table */
- uint16_t *p_rgb16; /**< RGB 16 bits table */
- uint32_t *p_rgb32; /**< RGB 32 bits table */
- /**< To get RGB value for palette entry i, use (p_rgb_r[i], p_rgb_g[i],
- p_rgb_b[i]). Note these are 16 bits per pixel. For 8bpp entries,
- shift right 8 bits.
- */
- uint16_t p_rgb_r[CMAP_RGB2_SIZE]; /**< Red values of palette */
- uint16_t p_rgb_g[CMAP_RGB2_SIZE]; /**< Green values of palette */
- uint16_t p_rgb_b[CMAP_RGB2_SIZE]; /**< Blue values of palette */
- #endif
- };
- /*****************************************************************************
- * Prototypes
- *****************************************************************************/
- #ifdef MODULE_NAME_IS_i420_rgb
- void E_(I420_RGB8) ( vout_thread_t *, picture_t *, picture_t * );
- void E_(I420_RGB16_dither) ( vout_thread_t *, picture_t *, picture_t * );
- #endif
- void E_(I420_RGB16) ( vout_thread_t *, picture_t *, picture_t * );
- void E_(I420_RGB32) ( vout_thread_t *, picture_t *, picture_t * );
- /*****************************************************************************
- * CONVERT_*_PIXEL: pixel conversion macros
- *****************************************************************************
- * These conversion routines are used by YUV conversion functions.
- * conversion are made from p_y, p_u, p_v, which are modified, to p_buffer,
- * which is also modified. CONVERT_4YUV_PIXEL is used for 8bpp dithering,
- * CONVERT_4YUV_PIXEL_SCALE does the same but also scales the output.
- *****************************************************************************/
- #define CONVERT_Y_PIXEL( BPP )
- /* Only Y sample is present */
- p_ybase = p_yuv + *p_y++;
- *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128)>>SHIFT) + i_red] |
- p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128)>>SHIFT)
- + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128)>>SHIFT) + i_blue];
- #define CONVERT_YUV_PIXEL( BPP )
- /* Y, U and V samples are present */
- i_uval = *p_u++;
- i_vval = *p_v++;
- i_red = (V_RED_COEF * i_vval) >> SHIFT;
- i_green = (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;
- i_blue = (U_BLUE_COEF * i_uval) >> SHIFT;
- CONVERT_Y_PIXEL( BPP )
- #define CONVERT_Y_PIXEL_DITHER( BPP )
- /* Only Y sample is present */
- p_ybase = p_yuv + *p_y++;
- *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128+p_dither[i_real_y])>>SHIFT) + i_red] |
- p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128+p_dither[i_real_y])>>SHIFT)
- + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128+p_dither[i_real_y])>>SHIFT) + i_blue];
- #define CONVERT_YUV_PIXEL_DITHER( BPP )
- /* Y, U and V samples are present */
- i_uval = *p_u++;
- i_vval = *p_v++;
- i_red = (V_RED_COEF * i_vval) >> SHIFT;
- i_green = (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;
- i_blue = (U_BLUE_COEF * i_uval) >> SHIFT;
- CONVERT_Y_PIXEL_DITHER( BPP )
- #define CONVERT_4YUV_PIXEL( CHROMA )
- *p_pic++ = p_lookup[
- (((*p_y++ + dither10[i_real_y]) >> 4) << 7)
- + ((*p_u + dither20[i_real_y]) >> 5) * 9
- + ((*p_v + dither20[i_real_y]) >> 5) ];
- *p_pic++ = p_lookup[
- (((*p_y++ + dither11[i_real_y]) >> 4) << 7)
- + ((*p_u++ + dither21[i_real_y]) >> 5) * 9
- + ((*p_v++ + dither21[i_real_y]) >> 5) ];
- *p_pic++ = p_lookup[
- (((*p_y++ + dither12[i_real_y]) >> 4) << 7)
- + ((*p_u + dither22[i_real_y]) >> 5) * 9
- + ((*p_v + dither22[i_real_y]) >> 5) ];
- *p_pic++ = p_lookup[
- (((*p_y++ + dither13[i_real_y]) >> 4) << 7)
- + ((*p_u++ + dither23[i_real_y]) >> 5) * 9
- + ((*p_v++ + dither23[i_real_y]) >> 5) ];
- #define CONVERT_4YUV_PIXEL_SCALE( CHROMA )
- *p_pic++ = p_lookup[
- ( ((*p_y + dither10[i_real_y]) >> 4) << 7)
- + ((*p_u + dither20[i_real_y]) >> 5) * 9
- + ((*p_v + dither20[i_real_y]) >> 5) ];
- p_y += *p_offset++;
- p_u += *p_offset;
- p_v += *p_offset++;
- *p_pic++ = p_lookup[
- ( ((*p_y + dither11[i_real_y]) >> 4) << 7)
- + ((*p_u + dither21[i_real_y]) >> 5) * 9
- + ((*p_v + dither21[i_real_y]) >> 5) ];
- p_y += *p_offset++;
- p_u += *p_offset;
- p_v += *p_offset++;
- *p_pic++ = p_lookup[
- ( ((*p_y + dither12[i_real_y]) >> 4) << 7)
- + ((*p_u + dither22[i_real_y]) >> 5) * 9
- + ((*p_v + dither22[i_real_y]) >> 5) ];
- p_y += *p_offset++;
- p_u += *p_offset;
- p_v += *p_offset++;
- *p_pic++ = p_lookup[
- ( ((*p_y + dither13[i_real_y]) >> 4) << 7)
- + ((*p_u + dither23[i_real_y]) >> 5) * 9
- + ((*p_v + dither23[i_real_y]) >> 5) ];
- p_y += *p_offset++;
- p_u += *p_offset;
- p_v += *p_offset++;
- /*****************************************************************************
- * SCALE_WIDTH: scale a line horizontally
- *****************************************************************************
- * This macro scales a line using rendering buffer and offset array. It works
- * for 1, 2 and 4 Bpp.
- *****************************************************************************/
- #define SCALE_WIDTH
- if( b_hscale )
- {
- /* Horizontal scaling, conversion has been done to buffer.
- * Rewind buffer and offset, then copy and scale line */
- p_buffer = p_buffer_start;
- p_offset = p_offset_start;
- for( i_x = p_vout->output.i_width / 16; i_x--; )
- {
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- }
- for( i_x = p_vout->output.i_width & 15; i_x--; )
- {
- *p_pic++ = *p_buffer; p_buffer += *p_offset++;
- }
- p_pic = (void*)((uint8_t*)p_pic + i_right_margin );
- }
- else
- {
- /* No scaling, conversion has been done directly in picture memory.
- * Increment of picture pointer to end of line is still needed */
- p_pic = (void*)((uint8_t*)p_pic + p_dest->p->i_pitch );
- }
- /*****************************************************************************
- * SCALE_WIDTH_DITHER: scale a line horizontally for dithered 8 bpp
- *****************************************************************************
- * This macro scales a line using an offset array.
- *****************************************************************************/
- #define SCALE_WIDTH_DITHER( CHROMA )
- if( b_hscale )
- {
- /* Horizontal scaling - we can't use a buffer due to dithering */
- p_offset = p_offset_start;
- for( i_x = p_vout->output.i_width / 16; i_x--; )
- {
- CONVERT_4YUV_PIXEL_SCALE( CHROMA )
- CONVERT_4YUV_PIXEL_SCALE( CHROMA )
- CONVERT_4YUV_PIXEL_SCALE( CHROMA )
- CONVERT_4YUV_PIXEL_SCALE( CHROMA )
- }
- }
- else
- {
- for( i_x = p_vout->render.i_width / 16; i_x--; )
- {
- CONVERT_4YUV_PIXEL( CHROMA )
- CONVERT_4YUV_PIXEL( CHROMA )
- CONVERT_4YUV_PIXEL( CHROMA )
- CONVERT_4YUV_PIXEL( CHROMA )
- }
- }
- /* Increment of picture pointer to end of line is still needed */
- p_pic = (void*)((uint8_t*)p_pic + i_right_margin );
-
- /* Increment the Y coordinate in the matrix, modulo 4 */
- i_real_y = (i_real_y + 1) & 0x3;
- /*****************************************************************************
- * SCALE_HEIGHT: handle vertical scaling
- *****************************************************************************
- * This macro handle vertical scaling for a picture. CHROMA may be 420, 422 or
- * 444 for RGB conversion, or 400 for gray conversion. It works for 1, 2, 3
- * and 4 Bpp.
- *****************************************************************************/
- #define SCALE_HEIGHT( CHROMA, BPP )
- /* If line is odd, rewind 4:2:0 U and V samples */
- if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )
- {
- p_u -= i_chroma_width;
- p_v -= i_chroma_width;
- }
-
- /*
- * Handle vertical scaling. The current line can be copied or next one
- * can be ignored.
- */
- switch( i_vscale )
- {
- case -1: /* vertical scaling factor is < 1 */
- while( (i_scale_count -= p_vout->output.i_height) > 0 )
- {
- /* Height reduction: skip next source line */
- p_y += p_vout->render.i_width;
- i_y++;
- if( (CHROMA == 420) || (CHROMA == 422) )
- {
- if( i_y & 0x1 )
- {
- p_u += i_chroma_width;
- p_v += i_chroma_width;
- }
- }
- else if( CHROMA == 444 )
- {
- p_u += p_vout->render.i_width;
- p_v += p_vout->render.i_width;
- }
- }
- i_scale_count += p_vout->render.i_height;
- break;
- case 1: /* vertical scaling factor is > 1 */
- while( (i_scale_count -= p_vout->render.i_height) > 0 )
- {
- /* Height increment: copy previous picture line */
- p_vout->p_vlc->pf_memcpy( p_pic, p_pic_start,
- p_vout->output.i_width * BPP );
- p_pic = (void*)((uint8_t*)p_pic + p_dest->p->i_pitch );
- }
- i_scale_count += p_vout->output.i_height;
- break;
- }
- /*****************************************************************************
- * SCALE_HEIGHT_DITHER: handle vertical scaling for dithered 8 bpp
- *****************************************************************************
- * This macro handles vertical scaling for a picture. CHROMA may be 420,
- * 422 or 444 for RGB conversion, or 400 for gray conversion.
- *****************************************************************************/
- #define SCALE_HEIGHT_DITHER( CHROMA )
-
- /* If line is odd, rewind 4:2:0 U and V samples */
- if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )
- {
- p_u -= i_chroma_width;
- p_v -= i_chroma_width;
- }
-
- /*
- * Handle vertical scaling. The current line can be copied or next one
- * can be ignored.
- */
-
- switch( i_vscale )
- {
- case -1: /* vertical scaling factor is < 1 */
- while( (i_scale_count -= p_vout->output.i_height) > 0 )
- {
- /* Height reduction: skip next source line */
- p_y += p_vout->render.i_width;
- i_y++;
- if( (CHROMA == 420) || (CHROMA == 422) )
- {
- if( i_y & 0x1 )
- {
- p_u += i_chroma_width;
- p_v += i_chroma_width;
- }
- }
- else if( CHROMA == 444 )
- {
- p_u += p_vout->render.i_width;
- p_v += p_vout->render.i_width;
- }
- }
- i_scale_count += p_vout->render.i_height;
- break;
- case 1: /* vertical scaling factor is > 1 */
- while( (i_scale_count -= p_vout->render.i_height) > 0 )
- {
- p_y -= p_vout->render.i_width;
- p_u -= i_chroma_width;
- p_v -= i_chroma_width;
- SCALE_WIDTH_DITHER( CHROMA );
- }
- i_scale_count += p_vout->output.i_height;
- break;
- }
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