migrate skpdiff to tools

experimental/skpdiff/SkDifferentPixelsMetric_cpu.cpp

-/*
- * 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 <cstring>
-
-#include "SkBitmap.h"
-
-#include "SkDifferentPixelsMetric.h"
-#include "skpdiff_util.h"
-
-struct SkDifferentPixelsMetric::QueuedDiff {
-    bool finished;
-    double result;
-    SkTDArray<SkIPoint>* poi;
-};
-
-const char* SkDifferentPixelsMetric::getName() {
-    return "different_pixels";
-}
-
-int SkDifferentPixelsMetric::queueDiff(SkBitmap* baseline, SkBitmap* test) {
-    double startTime = get_seconds();
-    int diffID = fQueuedDiffs.count();
-    QueuedDiff* diff = fQueuedDiffs.push();
-    SkTDArray<SkIPoint>* poi = diff->poi = new SkTDArray<SkIPoint>();
-
-    // If we never end up running the kernel, include some safe defaults in the result.
-    diff->finished = false;
-    diff->result = -1;
-
-    // Ensure the images are comparable
-    if (baseline->width() != test->width() || baseline->height() != test->height() ||
-        baseline->width() <= 0 || baseline->height() <= 0 ||
-        baseline->config() != test->config()) {
-        diff->finished = true;
-        return diffID;
-    }
-
-    int width = baseline->width();
-    int height = baseline->height();
-    int differentPixelsCount = 0;
-
-    // Prepare the pixels for comparison
-    baseline->lockPixels();
-    test->lockPixels();
-    for (int y = 0; y < height; y++) {
-        // Grab a row from each image for easy comparison
-        unsigned char* baselineRow = (unsigned char*)baseline->getAddr(0, y);
-        unsigned char* testRow = (unsigned char*)test->getAddr(0, y);
-        for (int x = 0; x < width; x++) {
-            // Compare one pixel at a time so each differing pixel can be noted
-            if (std::memcmp(&baselineRow[x * 4], &testRow[x * 4], 4) != 0) {
-                poi->push()->set(x, y);
-                differentPixelsCount++;
-            }
-        }
-    }
-    test->unlockPixels();
-    baseline->unlockPixels();
-
-    // Calculates the percentage of identical pixels
-    diff->result = 1.0 - ((double)differentPixelsCount / (width * height));
-
-    SkDebugf("Time: %f\n", (get_seconds() - startTime));
-
-    return diffID;
-}
-
-void SkDifferentPixelsMetric::deleteDiff(int id) {
-    if (NULL != fQueuedDiffs[id].poi)
-    {
-        delete fQueuedDiffs[id].poi;
-        fQueuedDiffs[id].poi = NULL;
-    }
-}
-
-bool SkDifferentPixelsMetric::isFinished(int id) {
-    return fQueuedDiffs[id].finished;
-}
-
-double SkDifferentPixelsMetric::getResult(int id) {
-    return fQueuedDiffs[id].result;
-}
-
-int SkDifferentPixelsMetric::getPointsOfInterestCount(int id) {
-    return fQueuedDiffs[id].poi->count();
-}
-
-SkIPoint* SkDifferentPixelsMetric::getPointsOfInterest(int id) {
-    return fQueuedDiffs[id].poi->begin();
-}