| 1 | ; |
| 2 | ; x86 format converters for HERMES |
| 3 | ; Some routines Copyright (c) 1998 Christian Nentwich (brn@eleet.mcb.at) |
| 4 | ; This source code is licensed under the GNU LGPL |
| 5 | ; |
| 6 | ; Please refer to the file COPYING.LIB contained in the distribution for |
| 7 | ; licensing conditions |
| 8 | ; |
| 9 | ; Most routines are (c) Glenn Fiedler (ptc@gaffer.org), used with permission |
| 10 | ; |
| 11 | |
| 12 | BITS 32 |
| 13 | |
| 14 | %include "common.inc" |
| 15 | |
| 16 | SDL_FUNC _ConvertX86 |
| 17 | |
| 18 | SECTION .text |
| 19 | |
| 20 | ;; _ConvertX86: |
| 21 | ;; [ESP+8] ConverterInfo* |
| 22 | ;; -------------------------------------------------------------------------- |
| 23 | ;; ConverterInfo (ebp+..) |
| 24 | ;; 0: void *s_pixels |
| 25 | ;; 4: int s_width |
| 26 | ;; 8: int s_height |
| 27 | ;; 12: int s_add |
| 28 | ;; 16: void *d_pixels |
| 29 | ;; 20: int d_width |
| 30 | ;; 24: int d_height |
| 31 | ;; 28: int d_add |
| 32 | ;; 32: void (*converter_function)() |
| 33 | ;; 36: int32 *lookup |
| 34 | |
| 35 | _ConvertX86: |
| 36 | push ebp |
| 37 | mov ebp,esp |
| 38 | |
| 39 | ; Save the registers used by the blitters, necessary for optimized code |
| 40 | pusha |
| 41 | |
| 42 | mov eax,[ebp+8] |
| 43 | |
| 44 | cmp dword [eax+4],BYTE 0 |
| 45 | je endconvert |
| 46 | |
| 47 | mov ebp,eax |
| 48 | |
| 49 | mov esi,[ebp+0] |
| 50 | mov edi,[ebp+16] |
| 51 | |
| 52 | y_loop: |
| 53 | mov ecx,[ebp+4] |
| 54 | |
| 55 | call [ebp+32] |
| 56 | |
| 57 | add esi,[ebp+12] |
| 58 | add edi,[ebp+28] |
| 59 | |
| 60 | dec dword [ebp+8] |
| 61 | jnz y_loop |
| 62 | |
| 63 | ; Restore the registers used by the blitters, necessary for optimized code |
| 64 | popa |
| 65 | |
| 66 | pop ebp |
| 67 | |
| 68 | endconvert: |
| 69 | ret |
| 70 | |
| 71 | |
| 72 | |
| 73 | %ifidn __OUTPUT_FORMAT__,elf |
| 74 | section .note.GNU-stack noalloc noexec nowrite progbits |
| 75 | %endif |