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https://github.com/reactos/reactos.git
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154 lines
5.8 KiB
ArmAsm
154 lines
5.8 KiB
ArmAsm
/*
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* PROJECT: Win32 subsystem
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* LICENSE: See COPYING in the top level directory
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* FILE: subsystems/win32/win32k/dib/i386/dib24bpp_hline.c
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* PURPOSE: ASM optimised 24bpp HLine
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* PROGRAMMERS: Magnus Olsen
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*/
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#include <asm.inc>
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.code
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PUBLIC _DIB_24BPP_HLine
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_DIB_24BPP_HLine:
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push edi
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push esi
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push ebx
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sub esp, 24
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mov ebx, [esp+40]
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mov edi, [esp+52]
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mov ecx, [esp+44]
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mov eax, [ebx+36]
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mov esi, [ebx+32]
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mov edx, [esp+48]
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imul eax, edi
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sub edx, ecx
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mov [esp], edx
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add eax, esi
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lea eax, [eax+ecx*2]
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add eax, ecx
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cmp edx, 7
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mov esi, edx
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mov [esp+4], eax
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ja Align4byte
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lea eax, [edx-1]
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mov [esp], eax
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inc eax
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jnz small_fill
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add esp, 24
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pop ebx
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pop esi
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pop edi
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ret
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/* For small fills, don't bother doing anything fancy */
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small_fill:
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movzx ecx, word ptr [esp+58]
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mov edx, [esp+4]
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mov esi, [esp+56]
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lea eax, [edx+2]
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mov [esp+4], eax
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mov [edx+2], cl
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mov eax, [esp]
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inc dword ptr [esp+4]
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mov [edx], si
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dec eax
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mov [esp], eax
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inc eax
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jnz small_fill
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add esp, 24
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pop ebx
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pop esi
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pop edi
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ret
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Align4byte:
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/* Align to 4-byte address */
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test al, 3
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mov ecx, eax
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jz loop1
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lea esi, [esi+0]
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lea edi, [edi+0]
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loopasmversion:
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/* This is about 30% faster than the generic C code below */
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movzx edx, word ptr [esp+58]
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lea edi, [ecx+2]
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mov eax, [esp+56]
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mov [esp+4], edi
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mov [ecx+2], dl
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mov ebx, [esp+4]
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mov [ecx], ax
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mov edx, [esp]
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inc ebx
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mov [esp+4], ebx
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dec edx
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test bl, 3
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mov [esp], edx
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mov ecx, ebx
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jnz loopasmversion
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mov esi, edx
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loop1:
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mov ecx, [esp+56]
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and ecx, 16777215
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mov ebx, ecx
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shr ebx, 8
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mov eax, ecx
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shl eax, 16
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or ebx, eax
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mov edx, ecx
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shl edx, 8
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mov eax, ecx
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shr eax, 16
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or edx, eax
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mov eax, ecx
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shl eax, 24
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or eax, ecx
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mov ecx, [esp]
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shr ecx, 2
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mov edi, [esp+4]
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loop2:
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mov [edi], eax
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mov [edi+4], ebx
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mov [edi+8], edx
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add edi, 12
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dec ecx
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jnz loop2
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mov [esp+4], edi
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and esi, 3
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lea eax, [esi-1]
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mov [esp], eax
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inc eax
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jnz leftoverfromthemainloop
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add esp, 24
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pop ebx
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pop esi
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pop edi
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ret
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leftoverfromthemainloop:
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/* Count = Count & 0x03; */
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mov ecx, [esp+4]
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mov ebx, [esp+56]
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lea esi, [ecx+2]
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mov [ecx], bx
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shr ebx, 16
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mov [esp+4], esi
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mov [ecx+2], bl
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mov eax, [esp]
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inc dword ptr [esp+4]
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dec eax
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mov [esp], eax
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inc eax
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jnz leftoverfromthemainloop
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add esp, 24
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pop ebx
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pop esi
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pop edi
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ret
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END
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