| |
| /*! |
| ************************************************************************ |
| * \file refbuf.c |
| * |
| * \brief |
| * Declarations of teh reference frame buffer types and functions |
| ************************************************************************ |
| */ |
| |
| #include <stdlib.h> |
| #include <memory.h> |
| #include "global.h" |
| |
| #include "refbuf.h" |
| |
| |
| /*! |
| ************************************************************************ |
| * \brief |
| * Yields a pel line _pointer_ from one of the 16 sub-images |
| * Input does not require subpixel image indices |
| ************************************************************************ |
| */ |
| imgpel *FastLine4X (imgpel ****Pic, int y, int x) |
| { |
| return &(Pic[(y & 0x03)][(x & 0x03)][y >> 2][x >> 2]); |
| } |
| |
| /*! |
| ************************************************************************ |
| * \brief |
| * Yields a pel line _pointer_ from one of the 16 sub-images |
| * Input does not require subpixel image indices |
| ************************************************************************ |
| */ |
| imgpel *UMVLine4X (imgpel ****Pic, int y, int x) |
| { |
| int xpos = iClip3( 0, width_pad , x >> 2); |
| int ypos = iClip3( 0, height_pad, y >> 2); |
| |
| return &(Pic[(y & 0x03)][(x & 0x03)][ypos][xpos]); |
| } |
| |
| /*! |
| ************************************************************************ |
| * \brief |
| * Yields a pel line _pointer_ from one of the 16 (4:4:4), 32 (4:2:2), |
| * or 64 (4:2:0) sub-images |
| * Input does not require subpixel image indices |
| ************************************************************************ |
| */ |
| imgpel *UMVLine8X_chroma (imgpel ****Pic, int y, int x) |
| { |
| int xpos = iClip3 (0, width_pad_cr , x >> chroma_shift_x); |
| int ypos = iClip3 (0, height_pad_cr, y >> chroma_shift_y); |
| |
| return &(Pic[y & chroma_mask_mv_y][x & chroma_mask_mv_x][ypos][xpos]); |
| } |
| |
| /*! |
| ************************************************************************ |
| * \brief |
| * Yields a pel line _pointer_ from one of the 16 (4:4:4), 32 (4:2:2), |
| * or 64 (4:2:0) sub-images |
| * Input does not require subpixel image indices |
| ************************************************************************ |
| */ |
| imgpel *FastLine8X_chroma (imgpel ****Pic, int y, int x) |
| { |
| return &(Pic[y & chroma_mask_mv_y][x & chroma_mask_mv_x][y >> chroma_shift_y][x >> chroma_shift_x]); |
| } |
| |
| |
| |
