| ; |
| ; x86 format converters for HERMES |
| ; Some routines Copyright (c) 1998 Christian Nentwich (brn@eleet.mcb.at) |
| ; This source code is licensed under the GNU LGPL |
| ; |
| ; Please refer to the file COPYING.LIB contained in the distribution for |
| ; licensing conditions |
| ; |
| ; Most routines are (c) Glenn Fiedler (ptc@gaffer.org), used with permission |
| ; |
| |
| BITS 32 |
| |
| %include "common.inc" |
| |
| SDL_FUNC _ConvertX86 |
| |
| SECTION .text |
| |
| ;; _ConvertX86: |
| ;; [ESP+8] ConverterInfo* |
| ;; -------------------------------------------------------------------------- |
| ;; ConverterInfo (ebp+..) |
| ;; 0: void *s_pixels |
| ;; 4: int s_width |
| ;; 8: int s_height |
| ;; 12: int s_add |
| ;; 16: void *d_pixels |
| ;; 20: int d_width |
| ;; 24: int d_height |
| ;; 28: int d_add |
| ;; 32: void (*converter_function)() |
| ;; 36: int32 *lookup |
| |
| _ConvertX86: |
| push ebp |
| mov ebp,esp |
| |
| ; Save the registers used by the blitters, necessary for optimized code |
| pusha |
| |
| mov eax,[ebp+8] |
| |
| cmp dword [eax+4],BYTE 0 |
| je endconvert |
| |
| mov ebp,eax |
| |
| mov esi,[ebp+0] |
| mov edi,[ebp+16] |
| |
| y_loop: |
| mov ecx,[ebp+4] |
| |
| call [ebp+32] |
| |
| add esi,[ebp+12] |
| add edi,[ebp+28] |
| |
| dec dword [ebp+8] |
| jnz y_loop |
| |
| ; Restore the registers used by the blitters, necessary for optimized code |
| popa |
| |
| pop ebp |
| |
| endconvert: |
| ret |
| |
| |
| |
| %ifidn __OUTPUT_FORMAT__,elf |
| section .note.GNU-stack noalloc noexec nowrite progbits |
| %endif |
