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/*
* 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 computeMask,
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, NULL);
// 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, NULL, workSize,
NULL, 0, NULL, &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, NULL, NULL);
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;
}
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