1 ; 2 ; x86 format converters for HERMES 3 ; Some routines Copyright (c) 1998 Christian Nentwich (brn (a] 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 (a] 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 76
