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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 SkImageDiffer_DEFINED
#define SkImageDiffer_DEFINED
#include "SkBitmap.h"
/**
* Encapsulates an image difference metric algorithm that can be potentially run asynchronously.
*/
class SkImageDiffer {
public:
SkImageDiffer();
virtual ~SkImageDiffer();
static const double RESULT_CORRECT;
static const double RESULT_INCORRECT;
struct Result {
double result;
int poiCount;
// TODO(djsollen): Figure out a way that the differ can report which of the
// optional fields it has filled in. See http://skbug.com/2712 ('allow
// skpdiff to report different sets of result fields for different comparison algorithms')
SkBitmap poiAlphaMask; // optional
SkBitmap rgbDiffBitmap; // optional
SkBitmap whiteDiffBitmap; // optional
int maxRedDiff; // optional
int maxGreenDiff; // optional
int maxBlueDiff; // optional
double timeElapsed; // optional
};
// A bitfield indicating which bitmap types we want a differ to create.
//
// TODO(epoger): Remove whiteDiffBitmap, because alphaMask can provide
// the same functionality and more.
// It will be a little bit tricky, because the rebaseline_server client
// and server side code will both need to change to use the alphaMask.
struct BitmapsToCreate {
bool alphaMask;
bool rgbDiff;
bool whiteDiff;
};
/**
* Gets a unique and descriptive name of this differ
* @return A statically allocated null terminated string that is the name of this differ
*/
virtual const char* getName() const = 0;
/**
* Gets if this differ needs to be initialized with and OpenCL device and context.
*/
virtual bool requiresOpenCL() const { return false; }
/**
* diff on a pair of bitmaps.
* @param baseline The correct bitmap
* @param test The bitmap whose difference is being tested
* @param bitmapsToCreate Which bitmaps the differ should attempt to create
* @return true on success, and false in the case of failure
*/
virtual bool diff(SkBitmap* baseline, SkBitmap* test, const BitmapsToCreate& bitmapsToCreate,
Result* result) const = 0;
};
#endif
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