| /* |
| * 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(); |
| } |