| 1 | ; i386.asm - description |
| 2 | ; ------------------- |
| 3 | ; begin : Sun Nov 08 2001 |
| 4 | ; copyright : (C) 2001 by Pete Bernert |
| 5 | ; email : BlackDove@addcom.de |
| 6 | |
| 7 | ; ported from inline gcc to nasm by linuzappz |
| 8 | |
| 9 | |
| 10 | ; This program is free software; you can redistribute it and/or modify * |
| 11 | ; it under the terms of the GNU General Public License as published by * |
| 12 | ; the Free Software Foundation; either version 2 of the License, or * |
| 13 | ; (at your option) any later version. See also the license.txt file for * |
| 14 | ; additional informations. * |
| 15 | |
| 16 | |
| 17 | bits 32 |
| 18 | |
| 19 | section .text |
| 20 | |
| 21 | %include "macros.inc" |
| 22 | |
| 23 | NEWSYM i386_BGR24to16 |
| 24 | push ebp |
| 25 | mov ebp, esp |
| 26 | push ebx |
| 27 | push edx |
| 28 | |
| 29 | mov eax, [ebp+8] ; this can hold the G value |
| 30 | mov ebx, eax ; this can hold the R value |
| 31 | mov edx, eax ; this can hold the B value |
| 32 | shr ebx, 3 ; move the R value |
| 33 | and edx, 00f80000h ; mask the B value |
| 34 | shr edx, 9 ; move the B value |
| 35 | and eax, 00f800h ; mask the G value |
| 36 | shr eax, 6 ; move the G value |
| 37 | and ebx, 0000001fh ; mask the R value |
| 38 | or eax, ebx ; add R to G value |
| 39 | or eax, edx ; add B to RG value |
| 40 | pop edx |
| 41 | pop ebx |
| 42 | mov esp, ebp |
| 43 | pop ebp |
| 44 | ret |
| 45 | |
| 46 | NEWSYM i386_shl10idiv |
| 47 | push ebp |
| 48 | mov ebp, esp |
| 49 | push ebx |
| 50 | push edx |
| 51 | |
| 52 | mov eax, [ebp+8] |
| 53 | mov ebx, [ebp+12] |
| 54 | mov edx, eax |
| 55 | shl eax, 10 |
| 56 | sar edx, 22 |
| 57 | idiv ebx |
| 58 | |
| 59 | pop edx |
| 60 | pop ebx |
| 61 | mov esp, ebp |
| 62 | pop ebp |
| 63 | ret |
| 64 | %ifidn __OUTPUT_FORMAT__,elf |
| 65 | section .note.GNU-stack noalloc noexec nowrite progbits |
| 66 | %endif |
| 67 | |