diff options
| -rw-r--r-- | engines/scumm/gfxARM.s | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/engines/scumm/gfxARM.s b/engines/scumm/gfxARM.s index 78f36f324a..cd3e5c7dad 100644 --- a/engines/scumm/gfxARM.s +++ b/engines/scumm/gfxARM.s @@ -23,7 +23,8 @@ .text .global asmDrawStripToScreen - + .global asmCopy8Col + @ ARM implementation of asmDrawStripToScreen. @ @ C prototype would be: @@ -118,3 +119,41 @@ singleByteCompare: BGT yLoop end: LDMFD r13!,{r4-r7,r9-r11,PC} + + @ ARM implementation of asmCopy8Col + @ + @ C prototype would be: + @ + @ extern "C" void asmCopy8Col(byte *dst, + @ int dstPitch, + @ const byte *src, + @ int height); + @ + @ In addition, we assume that src and dst are both word (4 byte) + @ aligned. This is the same assumption that the old 'inline' version + @ made. +asmCopy8Col: + @ r0 = dst + @ r1 = dstPitch + @ r2 = src + @ r3 = height + STMFD r13!,{r14} + SUB r1,r1,#4 + + TST r3,#1 + ADDNE r3,r3,#1 + BNE roll2 +yLoop2: + LDR r12,[r2],#4 + LDR r14,[r2],r1 + STR r12,[r0],#4 + STR r14,[r0],r1 +roll2: + LDR r12,[r2],#4 + LDR r14,[r2],r1 + SUBS r3,r3,#2 + STR r12,[r0],#4 + STR r14,[r0],r1 + BNE yLoop2 + + LDMFD r13!,{PC} |