96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
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/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include <cstring>
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#include "SkBitmap.h"
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#include "SkDifferentPixelsMetric.h"
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#include "skpdiff_util.h"
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struct SkDifferentPixelsMetric::QueuedDiff {
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bool finished;
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double result;
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SkTDArray<SkIPoint>* poi;
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};
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const char* SkDifferentPixelsMetric::getName() {
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return "different_pixels";
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}
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int SkDifferentPixelsMetric::queueDiff(SkBitmap* baseline, SkBitmap* test) {
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double startTime = get_seconds();
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int diffID = fQueuedDiffs.count();
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QueuedDiff* diff = fQueuedDiffs.push();
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SkTDArray<SkIPoint>* poi = diff->poi = new SkTDArray<SkIPoint>();
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// If we never end up running the kernel, include some safe defaults in the result.
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diff->finished = false;
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diff->result = -1;
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// Ensure the images are comparable
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if (baseline->width() != test->width() || baseline->height() != test->height() ||
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baseline->width() <= 0 || baseline->height() <= 0 ||
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baseline->config() != test->config()) {
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diff->finished = true;
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return diffID;
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}
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int width = baseline->width();
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int height = baseline->height();
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int differentPixelsCount = 0;
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// Prepare the pixels for comparison
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baseline->lockPixels();
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test->lockPixels();
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for (int y = 0; y < height; y++) {
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// Grab a row from each image for easy comparison
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unsigned char* baselineRow = (unsigned char*)baseline->getAddr(0, y);
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unsigned char* testRow = (unsigned char*)test->getAddr(0, y);
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for (int x = 0; x < width; x++) {
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// Compare one pixel at a time so each differing pixel can be noted
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if (std::memcmp(&baselineRow[x * 4], &testRow[x * 4], 4) != 0) {
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poi->push()->set(x, y);
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differentPixelsCount++;
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}
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}
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}
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test->unlockPixels();
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baseline->unlockPixels();
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// Calculates the percentage of identical pixels
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diff->result = 1.0 - ((double)differentPixelsCount / (width * height));
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SkDebugf("Time: %f\n", (get_seconds() - startTime));
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return diffID;
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}
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void SkDifferentPixelsMetric::deleteDiff(int id) {
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if (NULL != fQueuedDiffs[id].poi)
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{
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delete fQueuedDiffs[id].poi;
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fQueuedDiffs[id].poi = NULL;
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}
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}
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bool SkDifferentPixelsMetric::isFinished(int id) {
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return fQueuedDiffs[id].finished;
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}
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double SkDifferentPixelsMetric::getResult(int id) {
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return fQueuedDiffs[id].result;
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}
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int SkDifferentPixelsMetric::getPointsOfInterestCount(int id) {
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return fQueuedDiffs[id].poi->count();
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}
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SkIPoint* SkDifferentPixelsMetric::getPointsOfInterest(int id) {
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return fQueuedDiffs[id].poi->begin();
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}
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