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png: add support for bpp>4 to paeth x86 SIMD code. 

This fixes playback of e.g. RGB48 (bpp=6) content on x86 CPUs. Fixes
bug 214.
This commit is contained in:
Ronald S. Bultje 2012-01-27 23:28:28 +08:00
parent f91c4b7824
commit af79a0c48a
1 changed files with 13 additions and 1 deletions
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14
libavcodec/x86/pngdsp.asm
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@ -2,6 +2,7 @@
;* x86 optimizations for PNG decoding
;*
;* Copyright (c) 2008 Loren Merritt <lorenm@u.washington.edu>
;* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
;*
;* This file is part of Libav.
;*
@ -100,6 +101,12 @@ cglobal add_png_paeth_prediction, 5, 7, %1, dst, src, top, w, bpp, end, cntr
sub srcq, dstq
sub dstq, bppq
pxor m7, m7
PUSH dstq
lea cntrq, [bppq-1]
shr cntrq, 2 + mmsize/16
.bpp_loop:
lea dstq, [dstq+cntrq*(mmsize/2)]
movh m0, [dstq]
movh m1, [topq+dstq]
punpcklbw m0, m7
@ -152,7 +159,12 @@ cglobal add_png_paeth_prediction, 5, 7, %1, dst, src, top, w, bpp, end, cntr
add dstq, bppq
cmp dstq, endq
jle .loop
REP_RET
mov dstq, [rsp]
dec cntrq
jge .bpp_loop
POP dstq
RET
%endmacro
INIT_MMX mmx2