add skpdiff tool to compare bitmaps

experimental/skpdiff/skpdiff_util.cpp

Index: experimental/skpdiff/skpdiff_util.cpp
diff --git a/experimental/skpdiff/skpdiff_util.cpp b/experimental/skpdiff/skpdiff_util.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e9de95c87ace8cd6df2c67533d11922e97618e40
--- /dev/null
+++ b/experimental/skpdiff/skpdiff_util.cpp
@@ -0,0 +1,88 @@
+#include <time.h>
+#include <dirent.h>
+#include "SkOSFile.h"
+#include "skpdiff_util.h"
+
+const char* cl_error_to_string(cl_int err) {
+    switch (err) {
+        case CL_SUCCESS:                         return "CL_SUCCESS";
+        case CL_DEVICE_NOT_FOUND:                return "CL_DEVICE_NOT_FOUND";
+        case CL_DEVICE_NOT_AVAILABLE:            return "CL_DEVICE_NOT_AVAILABLE";
+        case CL_COMPILER_NOT_AVAILABLE:          return "CL_COMPILER_NOT_AVAILABLE";
+        case CL_MEM_OBJECT_ALLOCATION_FAILURE:   return "CL_MEM_OBJECT_ALLOCATION_FAILURE";
+        case CL_OUT_OF_RESOURCES:                return "CL_OUT_OF_RESOURCES";
+        case CL_OUT_OF_HOST_MEMORY:              return "CL_OUT_OF_HOST_MEMORY";
+        case CL_PROFILING_INFO_NOT_AVAILABLE:    return "CL_PROFILING_INFO_NOT_AVAILABLE";
+        case CL_MEM_COPY_OVERLAP:                return "CL_MEM_COPY_OVERLAP";
+        case CL_IMAGE_FORMAT_MISMATCH:           return "CL_IMAGE_FORMAT_MISMATCH";
+        case CL_IMAGE_FORMAT_NOT_SUPPORTED:      return "CL_IMAGE_FORMAT_NOT_SUPPORTED";
+        case CL_BUILD_PROGRAM_FAILURE:           return "CL_BUILD_PROGRAM_FAILURE";
+        case CL_MAP_FAILURE:                     return "CL_MAP_FAILURE";
+        case CL_INVALID_VALUE:                   return "CL_INVALID_VALUE";
+        case CL_INVALID_DEVICE_TYPE:             return "CL_INVALID_DEVICE_TYPE";
+        case CL_INVALID_PLATFORM:                return "CL_INVALID_PLATFORM";
+        case CL_INVALID_DEVICE:                  return "CL_INVALID_DEVICE";
+        case CL_INVALID_CONTEXT:                 return "CL_INVALID_CONTEXT";
+        case CL_INVALID_QUEUE_PROPERTIES:        return "CL_INVALID_QUEUE_PROPERTIES";
+        case CL_INVALID_COMMAND_QUEUE:           return "CL_INVALID_COMMAND_QUEUE";
+        case CL_INVALID_HOST_PTR:                return "CL_INVALID_HOST_PTR";
+        case CL_INVALID_MEM_OBJECT:              return "CL_INVALID_MEM_OBJECT";
+        case CL_INVALID_IMAGE_FORMAT_DESCRIPTOR: return "CL_INVALID_IMAGE_FORMAT_DESCRIPTOR";
+        case CL_INVALID_IMAGE_SIZE:              return "CL_INVALID_IMAGE_SIZE";
+        case CL_INVALID_SAMPLER:                 return "CL_INVALID_SAMPLER";
+        case CL_INVALID_BINARY:                  return "CL_INVALID_BINARY";
+        case CL_INVALID_BUILD_OPTIONS:           return "CL_INVALID_BUILD_OPTIONS";
+        case CL_INVALID_PROGRAM:                 return "CL_INVALID_PROGRAM";
+        case CL_INVALID_PROGRAM_EXECUTABLE:      return "CL_INVALID_PROGRAM_EXECUTABLE";
+        case CL_INVALID_KERNEL_NAME:             return "CL_INVALID_KERNEL_NAME";
+        case CL_INVALID_KERNEL_DEFINITION:       return "CL_INVALID_KERNEL_DEFINITION";
+        case CL_INVALID_KERNEL:                  return "CL_INVALID_KERNEL";
+        case CL_INVALID_ARG_INDEX:               return "CL_INVALID_ARG_INDEX";
+        case CL_INVALID_ARG_VALUE:               return "CL_INVALID_ARG_VALUE";
+        case CL_INVALID_ARG_SIZE:                return "CL_INVALID_ARG_SIZE";
+        case CL_INVALID_KERNEL_ARGS:             return "CL_INVALID_KERNEL_ARGS";
+        case CL_INVALID_WORK_DIMENSION:          return "CL_INVALID_WORK_DIMENSION";
+        case CL_INVALID_WORK_GROUP_SIZE:         return "CL_INVALID_WORK_GROUP_SIZE";
+        case CL_INVALID_WORK_ITEM_SIZE:          return "CL_INVALID_WORK_ITEM_SIZE";
+        case CL_INVALID_GLOBAL_OFFSET:           return "CL_INVALID_GLOBAL_OFFSET";
+        case CL_INVALID_EVENT_WAIT_LIST:         return "CL_INVALID_EVENT_WAIT_LIST";
+        case CL_INVALID_EVENT:                   return "CL_INVALID_EVENT";
+        case CL_INVALID_OPERATION:               return "CL_INVALID_OPERATION";
+        case CL_INVALID_GL_OBJECT:               return "CL_INVALID_GL_OBJECT";
+        case CL_INVALID_BUFFER_SIZE:             return "CL_INVALID_BUFFER_SIZE";
+        case CL_INVALID_MIP_LEVEL:               return "CL_INVALID_MIP_LEVEL";
+        default:                                 return "UNKNOWN";
+    }
+    return "UNKNOWN";
+}
+
+
+double get_seconds() {
+    struct timespec currentTime;
+    clock_gettime(CLOCK_REALTIME, &currentTime);
+    return currentTime.tv_sec + (double)currentTime.tv_nsec / 1e9;
+}
+
+bool get_directory(const char path[], std::vector<std::string>* entries) {
+    // Open the directory and check for success
+    DIR* dir = opendir(path);
+    if (NULL == dir) {
+        return false;
+    }
+
+    // Loop through dir entries until there are none left (i.e. readdir returns NULL)
+    struct dirent* entry;
+    while ((entry = readdir(dir))) {
+        // dirent only gives relative paths, we need to join them to the base path to check if they
+        // are directories.
+        SkString joinedPath = SkOSPath::SkPathJoin(path, entry->d_name);
+
+        // We only care about files
+        if (!sk_isdir(joinedPath.c_str()))
+        {
+            entries->push_back(entry->d_name);
+        }
+    }
+
+    return true;
+}