Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(4)

Unified Diff: source/scale_any.cc

Issue 1558093003: Odd width variation of scale down by 2 for subsampling (Closed) Base URL: https://chromium.googlesource.com/libyuv/libyuv@master
Patch Set: bump version Created 4 years, 11 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « source/planar_functions.cc ('k') | source/scale_common.cc » ('j') | no next file with comments »
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: source/scale_any.cc
diff --git a/source/scale_any.cc b/source/scale_any.cc
index 1da4dacde7596642d4be57f4225576282f773a97..ed76a9e4c0417da6b9cf8dd33a1d886f574eef1e 100644
--- a/source/scale_any.cc
+++ b/source/scale_any.cc
@@ -55,12 +55,29 @@ CANY(ScaleARGBFilterCols_Any_NEON, ScaleARGBFilterCols_NEON,
dst_ptr + n * BPP, r); \
}
+// Fixed scale down for odd source width. Used by I420Blend subsampling.
+// Since dst_width is (width + 1) / 2, this function scales one less pixel
+// and copies the last pixel.
+#define SDODD(NAMEANY, SCALEROWDOWN_SIMD, SCALEROWDOWN_C, FACTOR, BPP, MASK) \
+ void NAMEANY(const uint8* src_ptr, ptrdiff_t src_stride, \
+ uint8* dst_ptr, int dst_width) { \
+ int r = (int)((unsigned int)(dst_width - 1) % (MASK + 1)); \
+ int n = dst_width - r; \
+ if (n > 0) { \
+ SCALEROWDOWN_SIMD(src_ptr, src_stride, dst_ptr, n); \
+ } \
+ SCALEROWDOWN_C(src_ptr + (n * FACTOR) * BPP, src_stride, \
+ dst_ptr + n * BPP, r); \
+ }
+
#ifdef HAS_SCALEROWDOWN2_SSSE3
SDANY(ScaleRowDown2_Any_SSSE3, ScaleRowDown2_SSSE3, ScaleRowDown2_C, 2, 1, 15)
SDANY(ScaleRowDown2Linear_Any_SSSE3, ScaleRowDown2Linear_SSSE3,
ScaleRowDown2Linear_C, 2, 1, 15)
SDANY(ScaleRowDown2Box_Any_SSSE3, ScaleRowDown2Box_SSSE3, ScaleRowDown2Box_C,
2, 1, 15)
+SDODD(ScaleRowDown2Box_Odd_SSSE3, ScaleRowDown2Box_SSSE3,
+ ScaleRowDown2Box_Odd_C, 2, 1, 15)
#endif
#ifdef HAS_SCALEROWDOWN2_AVX2
SDANY(ScaleRowDown2_Any_AVX2, ScaleRowDown2_AVX2, ScaleRowDown2_C, 2, 1, 31)
@@ -68,6 +85,8 @@ SDANY(ScaleRowDown2Linear_Any_AVX2, ScaleRowDown2Linear_AVX2,
ScaleRowDown2Linear_C, 2, 1, 31)
SDANY(ScaleRowDown2Box_Any_AVX2, ScaleRowDown2Box_AVX2, ScaleRowDown2Box_C,
2, 1, 31)
+SDODD(ScaleRowDown2Box_Odd_AVX2, ScaleRowDown2Box_AVX2, ScaleRowDown2Box_Odd_C,
+ 2, 1, 31)
#endif
#ifdef HAS_SCALEROWDOWN2_NEON
SDANY(ScaleRowDown2_Any_NEON, ScaleRowDown2_NEON, ScaleRowDown2_C, 2, 1, 15)
@@ -75,6 +94,8 @@ SDANY(ScaleRowDown2Linear_Any_NEON, ScaleRowDown2Linear_NEON,
ScaleRowDown2Linear_C, 2, 1, 15)
SDANY(ScaleRowDown2Box_Any_NEON, ScaleRowDown2Box_NEON,
ScaleRowDown2Box_C, 2, 1, 15)
+SDODD(ScaleRowDown2Box_Odd_NEON, ScaleRowDown2Box_NEON,
+ ScaleRowDown2Box_Odd_C, 2, 1, 15)
#endif
#ifdef HAS_SCALEROWDOWN4_SSSE3
SDANY(ScaleRowDown4_Any_SSSE3, ScaleRowDown4_SSSE3, ScaleRowDown4_C, 4, 1, 7)
« no previous file with comments | « source/planar_functions.cc ('k') | source/scale_common.cc » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698