From ef1ee362b36893cd1cc1e9c7de378e9cb239b0e8 Mon Sep 17 00:00:00 2001 From: "Ronald S. Bultje" Date: Wed, 29 Jun 2011 09:39:43 -0700 Subject: swscale: implement >8bit scaling support. This means that precision is retained when scaling between sample formats with >8 bits per component (48bit RGB, 16bit grayscale, 9/10/16bit YUV). --- libswscale/utils.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'libswscale/utils.c') diff --git a/libswscale/utils.c b/libswscale/utils.c index 69714183d0..b7ccac94ba 100644 --- a/libswscale/utils.c +++ b/libswscale/utils.c @@ -877,8 +877,13 @@ int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter) } } - FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW, 16) * 2, fail); - if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2) { + // FIXME it's even nicer if bpp isn't 16, but max({src,dst}formatbpp) + c->scalingBpp = FFMAX(av_pix_fmt_descriptors[srcFormat].comp[0].depth_minus1, + av_pix_fmt_descriptors[dstFormat].comp[0].depth_minus1) >= 8 ? 16 : 8; + if (c->scalingBpp == 16) + dst_stride <<= 1; + FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW, 16) * 2 * c->scalingBpp >> 3, fail); + if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2 && c->scalingBpp == 8) { c->canMMX2BeUsed= (dstW >=srcW && (dstW&31)==0 && (srcW&15)==0) ? 1 : 0; if (!c->canMMX2BeUsed && dstW >=srcW && (srcW&15)==0 && (flags&SWS_FAST_BILINEAR)) { if (flags&SWS_PRINT_INFO) -- cgit v1.2.3