skia2/gm/gm_expectations.h

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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.
*/
#ifndef gm_expectations_DEFINED
#define gm_expectations_DEFINED
#include "gm.h"
#include "SkBitmap.h"
#include "SkBitmapChecksummer.h"
#include "SkData.h"
#include "SkImageDecoder.h"
#include "SkOSFile.h"
#include "SkRefCnt.h"
#include "SkStream.h"
#include "SkTArray.h"
#ifdef SK_BUILD_FOR_WIN
// json includes xlocale which generates warning 4530 because we're compiling without
// exceptions; see https://code.google.com/p/skia/issues/detail?id=1067
#pragma warning(push)
#pragma warning(disable : 4530)
#endif
#include "json/reader.h"
#include "json/value.h"
#ifdef SK_BUILD_FOR_WIN
#pragma warning(pop)
#endif
#define DEBUGFAIL_SEE_STDERR SkDEBUGFAIL("see stderr for message")
const static char kJsonKey_ActualResults[] = "actual-results";
const static char kJsonKey_ActualResults_Failed[] = "failed";
const static char kJsonKey_ActualResults_FailureIgnored[]= "failure-ignored";
const static char kJsonKey_ActualResults_NoComparison[] = "no-comparison";
const static char kJsonKey_ActualResults_Succeeded[] = "succeeded";
const static char kJsonKey_ActualResults_AnyStatus_Checksum[] = "checksum";
const static char kJsonKey_ExpectedResults[] = "expected-results";
const static char kJsonKey_ExpectedResults_Checksums[] = "checksums";
const static char kJsonKey_ExpectedResults_IgnoreFailure[] = "ignore-failure";
namespace skiagm {
// The actual type we use to represent a checksum is hidden in here.
typedef Json::UInt64 Checksum;
static inline Json::Value asJsonValue(Checksum checksum) {
return checksum;
}
static inline Checksum asChecksum(Json::Value jsonValue) {
return jsonValue.asUInt64();
}
static SkString make_filename(const char path[],
const char renderModeDescriptor[],
const char *name,
const char suffix[]) {
SkString filename(path);
if (filename.endsWith(SkPATH_SEPARATOR)) {
filename.remove(filename.size() - 1, 1);
}
filename.appendf("%c%s%s.%s", SkPATH_SEPARATOR,
name, renderModeDescriptor, suffix);
return filename;
}
/**
* Test expectations (allowed image checksums, etc.)
*/
class Expectations {
public:
/**
* No expectations at all.
*/
Expectations(bool ignoreFailure=kDefaultIgnoreFailure) {
fIgnoreFailure = ignoreFailure;
}
/**
* Expect exactly one image (appropriate for the case when we
* are comparing against a single PNG file).
*/
Expectations(const SkBitmap& bitmap, bool ignoreFailure=kDefaultIgnoreFailure) {
fBitmap = bitmap;
fIgnoreFailure = ignoreFailure;
fAllowedChecksums.push_back() = SkBitmapChecksummer::Compute64(bitmap);
}
/**
* Create Expectations from a JSON element as found within the
* kJsonKey_ExpectedResults section.
*
* It's fine if the jsonElement is null or empty; in that case, we just
* don't have any expectations.
*/
Expectations(Json::Value jsonElement) {
if (jsonElement.empty()) {
fIgnoreFailure = kDefaultIgnoreFailure;
} else {
Json::Value ignoreFailure = jsonElement[kJsonKey_ExpectedResults_IgnoreFailure];
if (ignoreFailure.isNull()) {
fIgnoreFailure = kDefaultIgnoreFailure;
} else if (!ignoreFailure.isBool()) {
fprintf(stderr, "found non-boolean json value for key '%s' in element '%s'\n",
kJsonKey_ExpectedResults_IgnoreFailure,
jsonElement.toStyledString().c_str());
DEBUGFAIL_SEE_STDERR;
fIgnoreFailure = kDefaultIgnoreFailure;
} else {
fIgnoreFailure = ignoreFailure.asBool();
}
Json::Value allowedChecksums = jsonElement[kJsonKey_ExpectedResults_Checksums];
if (allowedChecksums.isNull()) {
// ok, we'll just assume there aren't any expected checksums to compare against
} else if (!allowedChecksums.isArray()) {
fprintf(stderr, "found non-array json value for key '%s' in element '%s'\n",
kJsonKey_ExpectedResults_Checksums,
jsonElement.toStyledString().c_str());
DEBUGFAIL_SEE_STDERR;
} else {
for (Json::ArrayIndex i=0; i<allowedChecksums.size(); i++) {
Json::Value checksumElement = allowedChecksums[i];
if (!checksumElement.isIntegral()) {
fprintf(stderr, "found non-integer checksum in json element '%s'\n",
jsonElement.toStyledString().c_str());
DEBUGFAIL_SEE_STDERR;
} else {
fAllowedChecksums.push_back() = asChecksum(checksumElement);
}
}
}
}
}
/**
* Returns true iff we want to ignore failed expectations.
*/
bool ignoreFailure() const { return this->fIgnoreFailure; }
/**
* Returns true iff there are no allowed checksums.
*/
bool empty() const { return this->fAllowedChecksums.empty(); }
/**
* Returns true iff actualChecksum matches any allowedChecksum,
* regardless of fIgnoreFailure. (The caller can check
* that separately.)
*/
bool match(Checksum actualChecksum) const {
for (int i=0; i < this->fAllowedChecksums.count(); i++) {
Checksum allowedChecksum = this->fAllowedChecksums[i];
if (allowedChecksum == actualChecksum) {
return true;
}
}
return false;
}
/**
* If this Expectation is based on a single SkBitmap, return a
* pointer to that SkBitmap. Otherwise (if the Expectation is
* empty, or if it was based on a list of checksums rather
* than a single bitmap), returns NULL.
*/
const SkBitmap *asBitmap() const {
return (SkBitmap::kNo_Config == fBitmap.config()) ? NULL : &fBitmap;
}
/**
* Return a JSON representation of the allowed checksums.
* This does NOT include any information about whether to
* ignore failures.
*/
Json::Value allowedChecksumsAsJson() const {
Json::Value allowedChecksumArray;
if (!this->fAllowedChecksums.empty()) {
for (int i=0; i < this->fAllowedChecksums.count(); i++) {
Checksum allowedChecksum = this->fAllowedChecksums[i];
allowedChecksumArray.append(asJsonValue(allowedChecksum));
}
}
return allowedChecksumArray;
}
private:
const static bool kDefaultIgnoreFailure = false;
SkTArray<Checksum> fAllowedChecksums;
bool fIgnoreFailure;
SkBitmap fBitmap;
};
/**
* Abstract source of Expectations objects for individual tests.
*/
class ExpectationsSource : public SkRefCnt {
public:
virtual Expectations get(const char *testName) = 0;
};
/**
* Return Expectations based on individual image files on disk.
*/
class IndividualImageExpectationsSource : public ExpectationsSource {
public:
/**
* Create an ExpectationsSource that will return Expectations based on
* image files found within rootDir.
*
* rootDir: directory under which to look for image files
* (this string will be copied to storage within this object)
* notifyOfMissingFiles: whether to log a message to stderr if an image
* file cannot be found
*/
IndividualImageExpectationsSource(const char *rootDir,
bool notifyOfMissingFiles) :
fRootDir(rootDir), fNotifyOfMissingFiles(notifyOfMissingFiles) {}
Expectations get(const char *testName) SK_OVERRIDE {
SkString path = make_filename(fRootDir.c_str(), "", testName,
"png");
SkBitmap referenceBitmap;
bool decodedReferenceBitmap =
SkImageDecoder::DecodeFile(path.c_str(), &referenceBitmap,
SkBitmap::kARGB_8888_Config,
SkImageDecoder::kDecodePixels_Mode,
NULL);
if (decodedReferenceBitmap) {
return Expectations(referenceBitmap);
} else {
if (fNotifyOfMissingFiles) {
fprintf(stderr, "FAILED to read %s\n", path.c_str());
}
return Expectations();
}
}
private:
const SkString fRootDir;
const bool fNotifyOfMissingFiles;
};
/**
* Return Expectations based on JSON summary file.
*/
class JsonExpectationsSource : public ExpectationsSource {
public:
/**
* Create an ExpectationsSource that will return Expectations based on
* a JSON file.
*
* jsonPath: path to JSON file to read
*/
JsonExpectationsSource(const char *jsonPath) {
parse(jsonPath, &fJsonRoot);
fJsonExpectedResults = fJsonRoot[kJsonKey_ExpectedResults];
}
Expectations get(const char *testName) SK_OVERRIDE {
return Expectations(fJsonExpectedResults[testName]);
}
private:
/**
* Read as many bytes as possible (up to maxBytes) from the stream into
* an SkData object.
*
* If the returned SkData contains fewer than maxBytes, then EOF has been
* reached and no more data would be available from subsequent calls.
* (If EOF has already been reached, then this call will return an empty
* SkData object immediately.)
*
* If there are fewer than maxBytes bytes available to read from the
* stream, but the stream has not been closed yet, this call will block
* until there are enough bytes to read or the stream has been closed.
*
* It is up to the caller to call unref() on the returned SkData object
* once the data is no longer needed, so that the underlying buffer will
* be freed. For example:
*
* {
* size_t maxBytes = 256;
* SkAutoDataUnref dataRef(readIntoSkData(stream, maxBytes));
* if (NULL != dataRef.get()) {
* size_t bytesActuallyRead = dataRef.get()->size();
* // use the data...
* }
* }
* // underlying buffer has been freed, thanks to auto unref
*
*/
// TODO(epoger): Move this, into SkStream.[cpp|h] as attempted in
// https://codereview.appspot.com/7300071 ?
// And maybe readFileIntoSkData() also?
static SkData* readIntoSkData(SkStream &stream, size_t maxBytes) {
if (0 == maxBytes) {
return SkData::NewEmpty();
}
char* bufStart = reinterpret_cast<char *>(sk_malloc_throw(maxBytes));
char* bufPtr = bufStart;
size_t bytesRemaining = maxBytes;
while (bytesRemaining > 0) {
size_t bytesReadThisTime = stream.read(bufPtr, bytesRemaining);
if (0 == bytesReadThisTime) {
break;
}
bytesRemaining -= bytesReadThisTime;
bufPtr += bytesReadThisTime;
}
return SkData::NewFromMalloc(bufStart, maxBytes - bytesRemaining);
}
/**
* Wrapper around readIntoSkData for files: reads the entire file into
* an SkData object.
*/
static SkData* readFileIntoSkData(SkFILEStream &stream) {
return readIntoSkData(stream, stream.getLength());
}
/**
* Read the file contents from jsonPath and parse them into jsonRoot.
*
* Returns true if successful.
*/
static bool parse(const char *jsonPath, Json::Value *jsonRoot) {
SkFILEStream inFile(jsonPath);
if (!inFile.isValid()) {
fprintf(stderr, "unable to read JSON file %s\n", jsonPath);
DEBUGFAIL_SEE_STDERR;
return false;
}
SkAutoDataUnref dataRef(readFileIntoSkData(inFile));
if (NULL == dataRef.get()) {
fprintf(stderr, "error reading JSON file %s\n", jsonPath);
DEBUGFAIL_SEE_STDERR;
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)) {
fprintf(stderr, "error parsing JSON file %s\n", jsonPath);
DEBUGFAIL_SEE_STDERR;
return false;
}
return true;
}
Json::Value fJsonRoot;
Json::Value fJsonExpectedResults;
};
}
#endif