third_party/libyuv/README.libaom

Name: libyuv
URL: https://chromium.googlesource.com/libyuv/libyuv/
Version: dfaf7534e0e536f7e5ef8ddd7326797bd09b8622
License: BSD-3-Clause
License File: LICENSE
Shipped in Chromium: no
Security Critical: yes

Description:
libyuv is an open source project that includes YUV conversion and scaling
functionality.

The optimized scaler in libyuv is used in multiple resolution encoder example,
which down-samples the original input video (f.g. 1280x720) a number of times
in order to encode multiple resolution bit streams.

Local Modifications:

diff --git a/third_party/libyuv/source/cpu_id.cc b/third_party/libyuv/source/cpu_id.cc
index fe89452b7..72a7fb82f 100644
--- a/third_party/libyuv/source/cpu_id.cc
+++ b/third_party/libyuv/source/cpu_id.cc
@@ -108,7 +108,7 @@ void CpuId(int eax, int ecx, int* cpu_info) {
 //  }
 // For VS2013 and earlier 32 bit, the _xgetbv(0) optimizer produces bad code.
 // https://code.google.com/p/libyuv/issues/detail?id=529
-#if defined(_M_IX86) && (_MSC_VER < 1900)
+#if defined(_M_IX86) && defined(_MSC_VER) && (_MSC_VER < 1900)
 #pragma optimize("g", off)
 #endif
 #if (defined(_M_IX86) || defined(_M_X64) || defined(__i386__) || \
@@ -129,7 +129,7 @@ int GetXCR0() {
 #define GetXCR0() 0
 #endif  // defined(_M_IX86) || defined(_M_X64) ..
 // Return optimization to previous setting.
-#if defined(_M_IX86) && (_MSC_VER < 1900)
+#if defined(_M_IX86) && defined(_MSC_VER) && (_MSC_VER < 1900)
 #pragma optimize("g", on)
 #endif
diff --git a/third_party/libyuv/source/row_common.cc b/third_party/libyuv/source/row_common.cc
index 79aed5c787..b0add63a6e 100644
--- a/third_party/libyuv/source/row_common.cc
+++ b/third_party/libyuv/source/row_common.cc
@@ -37,7 +37,7 @@ extern "C" {
 // llvm x86 is poor at ternary operator, so use branchless min/max.

 #define USE_BRANCHLESS 1
-#if USE_BRANCHLESS
+#if defined(USE_BRANCHLESS)
 static __inline int32_t clamp0(int32_t v) {
   return -(v >= 0) & v;
 }
@@ -460,7 +460,7 @@ static __inline int RGB2xToV(uint16_t r, uint16_t g, uint16_t b) {

 // ARGBToY_C and ARGBToUV_C
 // Intel version mimic SSE/AVX which does 2 pavgb
-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)

 #define MAKEROWY(NAME, R, G, B, BPP)                                         \
   void NAME##ToYRow_C(const uint8_t* src_argb0, uint8_t* dst_y, int width) { \
@@ -602,7 +602,7 @@ static __inline int RGB2xToVJ(uint16_t r, uint16_t g, uint16_t b) {

 // ARGBToYJ_C and ARGBToUVJ_C
 // Intel version mimic SSE/AVX which does 2 pavgb
-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)
 #define MAKEROWYJ(NAME, R, G, B, BPP)                                         \
   void NAME##ToYJRow_C(const uint8_t* src_argb0, uint8_t* dst_y, int width) { \
     int x;                                                                    \
@@ -766,7 +766,7 @@ void RGB565ToUVRow_C(const uint8_t* src_rgb565,
     g3 = (g3 << 2) | (g3 >> 4);
     r3 = (r3 << 3) | (r3 >> 2);

-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)
     uint8_t ab = AVGB(AVGB(b0, b2), AVGB(b1, b3));
     uint8_t ag = AVGB(AVGB(g0, g2), AVGB(g1, g3));
     uint8_t ar = AVGB(AVGB(r0, r2), AVGB(r1, r3));
@@ -800,7 +800,7 @@ void RGB565ToUVRow_C(const uint8_t* src_rgb565,
     g2 = (g2 << 2) | (g2 >> 4);
     r2 = (r2 << 3) | (r2 >> 2);

-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)
     uint8_t ab = AVGB(b0, b2);
     uint8_t ag = AVGB(g0, g2);
     uint8_t ar = AVGB(r0, r2);
@@ -850,7 +850,7 @@ void ARGB1555ToUVRow_C(const uint8_t* src_argb1555,
     g3 = (g3 << 3) | (g3 >> 2);
     r3 = (r3 << 3) | (r3 >> 2);

-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)
     uint8_t ab = AVGB(AVGB(b0, b2), AVGB(b1, b3));
     uint8_t ag = AVGB(AVGB(g0, g2), AVGB(g1, g3));
     uint8_t ar = AVGB(AVGB(r0, r2), AVGB(r1, r3));
@@ -884,7 +884,7 @@ void ARGB1555ToUVRow_C(const uint8_t* src_argb1555,
     g2 = (g2 << 3) | (g2 >> 2);
     r2 = (r2 << 3) | (r2 >> 2);

-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)
     uint8_t ab = AVGB(b0, b2);
     uint8_t ag = AVGB(g0, g2);
     uint8_t ar = AVGB(r0, r2);
@@ -934,7 +934,7 @@ void ARGB4444ToUVRow_C(const uint8_t* src_argb4444,
     g3 = (g3 << 4) | g3;
     r3 = (r3 << 4) | r3;

-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)
     uint8_t ab = AVGB(AVGB(b0, b2), AVGB(b1, b3));
     uint8_t ag = AVGB(AVGB(g0, g2), AVGB(g1, g3));
     uint8_t ar = AVGB(AVGB(r0, r2), AVGB(r1, r3));
@@ -968,7 +968,7 @@ void ARGB4444ToUVRow_C(const uint8_t* src_argb4444,
     g2 = (g2 << 4) | g2;
     r2 = (r2 << 4) | r2;

-#if LIBYUV_ARGBTOUV_PAVGB
+#if defined(LIBYUV_ARGBTOUV_PAVGB)
     uint8_t ab = AVGB(b0, b2);
     uint8_t ag = AVGB(g0, g2);
     uint8_t ar = AVGB(r0, r2);