diff options
Diffstat (limited to 'recordmydesktop/include/rmdmacro.h')
| -rw-r--r-- | recordmydesktop/include/rmdmacro.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/recordmydesktop/include/rmdmacro.h b/recordmydesktop/include/rmdmacro.h index abbc42c..971763a 100644 --- a/recordmydesktop/include/rmdmacro.h +++ b/recordmydesktop/include/rmdmacro.h @@ -246,15 +246,16 @@ data_array[(k_tm*width_img+i_tm-1)*RMD_ULONG_SIZE_T+offset]+\ data_array[((k_tm-1)*width_img+i_tm-1)*RMD_ULONG_SIZE_T+offset])/4) + +//the 4 most significant bytes represent the A component which +//does not need to be added on t_val, as it is always unused #define CALC_TVAL_AVG_32(t_val,datapi,datapi_next){\ register unsigned int t1,t2,t3,t4;\ t1=*datapi;\ t2=*(datapi+1);\ t3=*datapi_next;\ t4=*(datapi_next+1);\ - t_val=((((t1&0xff000000) +(t2&0xff000000)+\ - (t3&0xff000000)+(t4&0xff000000))/4)&0xff000000)+\ - ((((t1&0x00ff0000) +(t2&0x00ff0000)+\ + t_val=((((t1&0x00ff0000) +(t2&0x00ff0000)+\ (t3&0x00ff0000)+(t4&0x00ff0000))/4)&0x00ff0000)+\ ((((t1&0x0000ff00) +(t2&0x0000ff00)+\ (t3&0x0000ff00)+(t4&0x0000ff00))/4)&0x0000ff00)+\ @@ -262,6 +263,13 @@ (t3&0x000000ff)+(t4&0x000000ff))/4)&0x000000ff);\ } +//when adding the r values, we go beyond +//the (16 bit)range of the t_val variable, but we are performing +//32 bit arithmetics, so there's no problem. +//(This note is useless, I'm just adding because +//the addition of the A components in CALC_TVAL_AVG_32, +//now removed as uneeded, produced an overflow which would have caused +//color distrtion, where it one of the R,G or B components) #define CALC_TVAL_AVG_16(t_val,datapi,datapi_next){\ register u_int16_t t1,t2,t3,t4;\ t1=*datapi;\ |