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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 "SkBitmapChecksummer.h"
#include "SkImageDecoder.h"
#include "SkOSFile.h"
#include "SkRefCnt.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/value.h"
#ifdef SK_BUILD_FOR_WIN
#pragma warning(pop)
#endif
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 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.
*
* We set ignoreFailure to false by default, but it doesn't really
* matter... the result will always be "no-comparison" anyway.
*/
Expectations(bool ignoreFailure=false) {
fIgnoreFailure = ignoreFailure;
}
/**
* Allow exactly one checksum (appropriate for the case when we
* are comparing against a single PNG file).
*
* By default, DO NOT ignore failures.
*/
Expectations(Checksum singleChecksum, bool ignoreFailure=false) {
fIgnoreFailure = ignoreFailure;
fAllowedChecksums.push_back() = singleChecksum;
}
/**
* 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;
}
/**
* 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:
SkTArray<Checksum> fAllowedChecksums;
bool fIgnoreFailure;
};
/**
* 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) {
Checksum checksum = SkBitmapChecksummer::Compute64(
referenceBitmap);
return Expectations(checksum);
} else {
if (fNotifyOfMissingFiles) {
fprintf(stderr, "FAILED to read %s\n", path.c_str());
}
return Expectations();
}
}
private:
const SkString fRootDir;
const bool fNotifyOfMissingFiles;
};
}
#endif
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