When was SkPDiff last used?

tools/skpdiff/SkDifferentPixelsMetric_opencl.cpp

Index: tools/skpdiff/SkDifferentPixelsMetric_opencl.cpp
diff --git a/tools/skpdiff/SkDifferentPixelsMetric_opencl.cpp b/tools/skpdiff/SkDifferentPixelsMetric_opencl.cpp
deleted file mode 100644
index 95ab9530ae5d991c47d3654ba492f95430336249..0000000000000000000000000000000000000000
--- a/tools/skpdiff/SkDifferentPixelsMetric_opencl.cpp
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkBitmap.h"
-
-#include "SkDifferentPixelsMetric.h"
-#include "skpdiff_util.h"
-
-static const char kDifferentPixelsKernelSource[] =
-    "#pragma OPENCL_EXTENSION cl_khr_global_int32_base_atomics                  \n"
-    "                                                                           \n"
-    "const sampler_t gInSampler = CLK_NORMALIZED_COORDS_FALSE |                 \n"
-    "                             CLK_ADDRESS_CLAMP_TO_EDGE   |                 \n"
-    "                             CLK_FILTER_NEAREST;                           \n"
-    "                                                                           \n"
-    "__kernel void diff(read_only image2d_t baseline, read_only image2d_t test, \n"
-    "                   __global int* result) {                                 \n"
-    "    int2 coord = (int2)(get_global_id(0), get_global_id(1));               \n"
-    "    uint4 baselinePixel = read_imageui(baseline, gInSampler, coord);       \n"
-    "    uint4 testPixel = read_imageui(test, gInSampler, coord);               \n"
-    "    if (baselinePixel.x != testPixel.x ||                                  \n"
-    "        baselinePixel.y != testPixel.y ||                                  \n"
-    "        baselinePixel.z != testPixel.z ||                                  \n"
-    "        baselinePixel.w != testPixel.w) {                                  \n"
-    "                                                                           \n"
-    "        atomic_inc(result);                                                \n"
-    "        // TODO: generate alpha mask                                       \n"
-    "    }                                                                      \n"
-    "}                                                                          \n";
-
-const char* SkDifferentPixelsMetric::getName() const {
-    return "different_pixels";
-}
-
-bool SkDifferentPixelsMetric::diff(SkBitmap* baseline, SkBitmap* test, bool computeAlphaMask,
-                                   bool computeRgbDiff, bool computeWhiteDiff,
-                                   Result* result) const {
-    double startTime = get_seconds();
-
-    if (!fIsGood) {
-        return false;
-    }
-
-    // If we never end up running the kernel, include some safe defaults in the result.
-    result->poiCount = 0;
-
-    // Ensure the images are comparable
-    if (baseline->width() != test->width() || baseline->height() != test->height() ||
-        baseline->width() <= 0 || baseline->height() <= 0 ||
-        baseline->config() != test->config()) {
-        return false;
-    }
-
-    cl_mem baselineImage;
-    cl_mem testImage;
-    cl_mem resultsBuffer;
-
-    // Upload images to the CL device
-    if (!this->makeImage2D(baseline, &baselineImage) || !this->makeImage2D(test, &testImage)) {
-        SkDebugf("creation of openCL images failed");
-        return false;
-    }
-
-    // A small hack that makes calculating percentage difference easier later on.
-    result->result = 1.0 / ((double)baseline->width() * baseline->height());
-
-    // Make a buffer to store results into. It must be initialized with pointers to memory.
-    static const int kZero = 0;
-    // We know OpenCL won't write to it because we use CL_MEM_COPY_HOST_PTR
-    resultsBuffer = clCreateBuffer(fContext, CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR,
-                                   sizeof(int), (int*)&kZero, nullptr);
-
-    // Set all kernel arguments
-    cl_int setArgErr = clSetKernelArg(fKernel, 0, sizeof(cl_mem), &baselineImage);
-    setArgErr       |= clSetKernelArg(fKernel, 1, sizeof(cl_mem), &testImage);
-    setArgErr       |= clSetKernelArg(fKernel, 2, sizeof(cl_mem), &resultsBuffer);
-    if (CL_SUCCESS != setArgErr) {
-        SkDebugf("Set arg failed: %s\n", cl_error_to_string(setArgErr));
-        return false;
-    }
-
-    // Queue this diff on the CL device
-    cl_event event;
-    const size_t workSize[] = { baseline->width(), baseline->height() };
-    cl_int enqueueErr;
-    enqueueErr = clEnqueueNDRangeKernel(fCommandQueue, fKernel, 2, nullptr, workSize,
-                                        nullptr, 0, nullptr, &event);
-    if (CL_SUCCESS != enqueueErr) {
-        SkDebugf("Enqueue failed: %s\n", cl_error_to_string(enqueueErr));
-        return false;
-    }
-
-    // This makes things totally synchronous. Actual queue is not ready yet
-    clWaitForEvents(1, &event);
-
-    // Immediate read back the results
-    clEnqueueReadBuffer(fCommandQueue, resultsBuffer, CL_TRUE, 0,
-                        sizeof(int), &result->poiCount, 0, nullptr, nullptr);
-    result->result *= (double)result->poiCount;
-    result->result = (1.0 - result->result);
-
-    // Release all the buffers created
-    clReleaseMemObject(resultsBuffer);
-    clReleaseMemObject(baselineImage);
-    clReleaseMemObject(testImage);
-
-    result->timeElapsed = get_seconds() - startTime;
-    return true;
-}
-
-bool SkDifferentPixelsMetric::onInit() {
-    if (!this->loadKernelSource(kDifferentPixelsKernelSource, "diff", &fKernel)) {
-        return false;
-    }
-
-    return true;
-}