Enable RVV if qemu is detected

- include a fix for jpeg unittests to do at least 1 iteration
- include a fix for scale uv to only use linearup2 if filter is linear

Tested on qemu with Intel host:
[ RUN      ] LibYUVBaseTest.TestCpuHas
Cpu Flags 805306369
Has RISCV 268435456
Has RVV 536870912
Has RVVZVFH 0
Has X86 0

Bug: libyuv:956, libyuv:959, libyuv:960
Change-Id: I4a1b66f83d82ba127780f52526153d586db90111
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4429570
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Randall Bosetti <rlb@google.com>

source/cpu_id.cc

@@ -196,9 +196,13 @@ LIBYUV_API SAFEBUFFERS int RiscvCpuCaps(const char* cpuinfo_name) {
   int flag = 0x0;
   FILE* f = fopen(cpuinfo_name, "re");
   if (!f) {
-    // Assume nothing if /proc/cpuinfo is unavailable.
+#if defined(__riscv_vector)
+    // Assume RVV if /proc/cpuinfo is unavailable.
     // This will occur for Chrome sandbox for Pepper or Render process.
+    return kCpuHasRVV;
+#else
     return 0;
+#endif
   }
   while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) {
     if (memcmp(cpuinfo_line, "isa", 3) == 0) {
@@ -243,6 +247,12 @@ LIBYUV_API SAFEBUFFERS int RiscvCpuCaps(const char* cpuinfo_name) {
         }
       }
     }
+#if defined(__riscv_vector)
+    else if ((memcmp(cpuinfo_line, "vendor_id\t: GenuineIntel", 24) == 0) ||
+             (memcmp(cpuinfo_line, "vendor_id\t: AuthenticAMD", 24) == 0)) {
+      flag |= kCpuHasRVV;
+    }
+#endif
   }
   fclose(f);
   return flag;

source/scale_uv.cc

@@ -1039,7 +1039,7 @@ static void ScaleUV(const uint8_t* src,
                        dst_stride, src, dst, x, y, dy, /*bpp=*/2, filtering);
     return;
   }
-  if (filtering && (dst_width + 1) / 2 == src_width) {
+  if ((filtering == kFilterLinear) && ((dst_width + 1) / 2 == src_width)) {
     ScaleUVLinearUp2(src_width, src_height, clip_width, clip_height, src_stride,
                      dst_stride, src, dst);
     return;
@@ -1139,7 +1139,7 @@ int UVScale_16(const uint16_t* src_uv,
   }
 #endif
 
-  if (filtering && (dst_width + 1) / 2 == src_width) {
+  if ((filtering == kFilterLinear) && ((dst_width + 1) / 2 == src_width)) {
     ScaleUVLinearUp2_16(src_width, src_height, dst_width, dst_height,
                         src_stride_uv, dst_stride_uv, src_uv, dst_uv);
     return 0;

unit_test/convert_test.cc

@@ -2209,6 +2209,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToI420) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_u, half_width * half_height);
@@ -2243,6 +2246,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToI420_NV21) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   // Convert to NV21
   align_buffer_page_end(dst_y, width * height);
@@ -2302,6 +2308,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToI420_NV12) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   // Convert to NV12
   align_buffer_page_end(dst_y, width * height);
@@ -2361,6 +2370,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToNV21_420) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2391,6 +2403,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToNV12_420) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2426,6 +2441,9 @@ TEST_F(LibYUVConvertTest, DISABLED_TestMJPGToNV21_422) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2456,6 +2474,9 @@ TEST_F(LibYUVConvertTest, DISABLED_TestMJPGToNV12_422) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2490,6 +2511,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToNV21_400) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2520,6 +2544,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToNV12_400) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2554,6 +2581,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToNV21_444) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2584,6 +2614,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToNV12_444) {
   int half_height = (height + 1) / 2;
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_y, width * height);
   align_buffer_page_end(dst_uv, half_width * half_height * 2);
@@ -2616,6 +2649,9 @@ TEST_F(LibYUVConvertTest, TestMJPGToARGB) {
 
   int benchmark_iterations = benchmark_iterations_ * benchmark_width_ *
                              benchmark_height_ / (width * height);
+  if (benchmark_iterations < 1) {
+    benchmark_iterations = 1;
+  }
 
   align_buffer_page_end(dst_argb, width * height * 4);
   for (int times = 0; times < benchmark_iterations; ++times) {