add --readJsonSummaryPath to render_pictures

tools/image_expectations.cpp

Index: tools/image_expectations.cpp
diff --git a/tools/image_expectations.cpp b/tools/image_expectations.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..421650ac98293c2a72e8cd090114d604a9fc95a5
--- /dev/null
+++ b/tools/image_expectations.cpp
@@ -0,0 +1,190 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * TODO(epoger): Combine this with gm/gm_expectations.cpp, or eliminate one of the two.
+ */
+
+#include "SkBitmap.h"
+#include "SkBitmapHasher.h"
+#include "SkData.h"
+#include "SkDataUtils.h"
+#include "SkJSONCPP.h"
+#include "SkOSFile.h"
+#include "SkStream.h"
+#include "SkTypes.h"
+
+#include "image_expectations.h"
+
+/*
+ * TODO(epoger): Similar constants are already maintained in 2 other places:
+ * gm/gm_json.py and gm/gm_expectations.cpp. We shouldn't add yet a third place.
+ * Figure out a way to share the definitions instead.
+ *
+ * Note that, as of https://codereview.chromium.org/226293002 , the JSON
+ * schema used here has started to differ from the one in gm_expectations.cpp .
+ * So the best thing to do is, once render_pictures JSON file format has stabilized,
+ * change GM over to using this file and remove gm/gm_expectations.cpp.
+ *
+ * TODO(epoger): Make constant strings consistent instead of mixing hypenated and camel-caps.
+ */
+const static char kJsonKey_ActualResults[] = "actual-results";
+const static char kJsonKey_ExpectedResults[] = "expected-results";
+const static char kJsonKey_Header[] = "header";
+const static char kJsonKey_Header_Type[] = "type";
+const static char kJsonKey_Header_Revision[] = "revision";
+const static char kJsonKey_Image_ChecksumAlgorithm[] = "checksumAlgorithm";
+const static char kJsonKey_Image_ChecksumValue[] = "checksumValue";
+const static char kJsonKey_Image_ComparisonResult[] = "comparisonResult";
+const static char kJsonKey_Image_Filepath[] = "filepath";
+const static char kJsonKey_Image_IgnoreFailure[] = "ignoreFailure";
+const static char kJsonKey_Source_TiledImages[] = "tiled-images";
+const static char kJsonKey_Source_WholeImage[] = "whole-image";
+// Values (not keys) that are written out by this JSON generator
+const static char kJsonValue_Header_Type[] = "ChecksummedImages";
+const static int kJsonValue_Header_Revision = 1;
+const static char kJsonValue_Image_ChecksumAlgorithm_Bitmap64bitMD5[] = "bitmap-64bitMD5";
+const static char kJsonValue_Image_ComparisonResult_Failed[] = "failed";
+const static char kJsonValue_Image_ComparisonResult_FailureIgnored[] = "failure-ignored";
+const static char kJsonValue_Image_ComparisonResult_NoComparison[] = "no-comparison";
+const static char kJsonValue_Image_ComparisonResult_Succeeded[] = "succeeded";
+
+namespace sk_tools {
+
+    // ImageDigest class...
+
+    ImageDigest::ImageDigest(const SkBitmap &bitmap) {
+        if (!SkBitmapHasher::ComputeDigest(bitmap, &fHashValue)) {
+            SkFAIL("unable to compute image digest");
+        }
+    }
+
+    ImageDigest::ImageDigest(const SkString &hashType, uint64_t hashValue) {
+        if (!hashType.equals(kJsonValue_Image_ChecksumAlgorithm_Bitmap64bitMD5)) {
+            SkFAIL((SkString("unsupported hashType ")+=hashType).c_str());
+        } else {
+            fHashValue = hashValue;
+        }
+    }
+
+    SkString ImageDigest::getHashType() const {
+        // TODO(epoger): The current implementation assumes that the
+        // result digest is always of type kJsonValue_Image_ChecksumAlgorithm_Bitmap64bitMD5 .
+        return SkString(kJsonValue_Image_ChecksumAlgorithm_Bitmap64bitMD5);
+    }
+
+    uint64_t ImageDigest::getHashValue() const {
+        return fHashValue;
+    }
+
+    // BitmapAndDigest class...
+
+    BitmapAndDigest::BitmapAndDigest(const SkBitmap &bitmap) :
+        fBitmap(bitmap), fEPOGERImageDigest(bitmap) {
+    }
+
+    const ImageDigest *BitmapAndDigest::getImageDigestPtr() {
+        return &fEPOGERImageDigest;
+    }
+
+    const SkBitmap *BitmapAndDigest::getBitmapPtr() const {
+        return &fBitmap;
+    }
+
+    // ImageResultsSummary class...
+
+    bool ImageResultsSummary::readExpectationsFile(const char *jsonPath) {
+        if (Parse(jsonPath, &fExpectedJsonRoot)) {
+            fExpectedResults = fExpectedJsonRoot[kJsonKey_ExpectedResults];
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    void ImageResultsSummary::add(const char *sourceName, const char *fileName,
+                                  const ImageDigest &digest, const int *tileNumber) {
+        // Get expectation, if any.
+        Json::Value expectedImage;
+        if (!fExpectedResults.isNull()) {
+            if (NULL == tileNumber) {
+                // EPOGER: before committing, add a unittest to exercise what happens if
+                // we don't have an expectation for a single sourceName/wholeImage.
+                expectedImage = fExpectedResults[sourceName][kJsonKey_Source_WholeImage];
+            } else {
+                // EPOGER: before committing, add a unittest to exercise what happens if
+                // we don't have an expectation for a single sourceName/tiledImage.
+                expectedImage = fExpectedResults[sourceName][kJsonKey_Source_TiledImages]
+                                                [*tileNumber];
+            }
+        }
+
+        // Fill in info about the actual result itself.
+        Json::Value actualChecksumAlgorithm = digest.getHashType().c_str();
+        Json::Value actualChecksumValue = Json::UInt64(digest.getHashValue());
+        Json::Value actualImage;
+        actualImage[kJsonKey_Image_ChecksumAlgorithm] = actualChecksumAlgorithm;
+        actualImage[kJsonKey_Image_ChecksumValue] = actualChecksumValue;
+        actualImage[kJsonKey_Image_Filepath] = fileName;
+
+        // Compare against expectedImage to fill in comparisonResult.
+        Json::Value comparisonResult = kJsonValue_Image_ComparisonResult_NoComparison;
+        if (!expectedImage.isNull()) {
+            if ((actualChecksumAlgorithm == expectedImage[kJsonKey_Image_ChecksumAlgorithm]) &&
+                (actualChecksumValue == expectedImage[kJsonKey_Image_ChecksumValue])) {
+                comparisonResult = kJsonValue_Image_ComparisonResult_Succeeded;
+            } else if (expectedImage[kJsonKey_Image_IgnoreFailure] == true) {
+                comparisonResult = kJsonValue_Image_ComparisonResult_FailureIgnored;
+            } else {
+                comparisonResult = kJsonValue_Image_ComparisonResult_Failed;
+            }
+        }
+        actualImage[kJsonKey_Image_ComparisonResult] = comparisonResult;
+
+        // Add this actual result to our collection.
+        if (NULL == tileNumber) {
+            fActualResults[sourceName][kJsonKey_Source_WholeImage] = actualImage;
+        } else {
+            fActualResults[sourceName][kJsonKey_Source_TiledImages][*tileNumber] = actualImage;
+        }
+    }
+
+    void ImageResultsSummary::writeToFile(const char *filename) const {
+        Json::Value header;
+        header[kJsonKey_Header_Type] = kJsonValue_Header_Type;
+        header[kJsonKey_Header_Revision] = kJsonValue_Header_Revision;
+        Json::Value root;
+        root[kJsonKey_Header] = header;
+        root[kJsonKey_ActualResults] = fActualResults;
+        std::string jsonStdString = root.toStyledString();
+        SkFILEWStream stream(filename);
+        stream.write(jsonStdString.c_str(), jsonStdString.length());
+    }
+
+    /*static*/ bool ImageResultsSummary::Parse(const char *jsonPath, Json::Value *jsonRoot) {
+        SkFILEStream inFile(jsonPath);
+        if (!inFile.isValid()) {
+            SkDebugf("unable to read JSON file %s\n", jsonPath);
+            return false;
+        }
+
+        SkAutoDataUnref dataRef(SkDataUtils::ReadFileIntoSkData(inFile));
+        if (NULL == dataRef.get()) {
+            SkDebugf("error reading JSON file %s\n", jsonPath);
+            return false;
+        }
+
+        const char *bytes = reinterpret_cast<const char *>(dataRef.get()->data());
+        size_t size = dataRef.get()->size();
+        Json::Reader reader;
+        if (!reader.parse(bytes, bytes+size, *jsonRoot)) {
+            SkDebugf("error parsing JSON file %s\n", jsonPath);
+            return false;
+        }
+
+        return true;
+    }
+
+} // namespace sk_tools