SkICC.h

/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkICC_DEFINED
#define SkICC_DEFINED

#include "SkData.h"
#include "SkRefCnt.h"

struct SkColorSpaceTransferFn;
class SkColorSpace;
class SkData;
class SkMatrix44;

class SK_API SkICC : public SkRefCnt {
public:

    static sk_sp<SkICC> Make(const void*, size_t);

    bool toXYZD50(SkMatrix44* toXYZD50) const;

    bool isNumericalTransferFn(SkColorSpaceTransferFn* fn) const;

    struct Channel {
        // Byte offset of the start of the table in |fStorage|
        size_t fOffset;
        int    fCount;
    };
    struct Tables {
        Channel fRed;
        Channel fGreen;
        Channel fBlue;

        const float* red() {
            return (const float*) (fStorage->bytes() + fRed.fOffset);
        }
        const float* green() {
            return (const float*) (fStorage->bytes() + fGreen.fOffset);
        }
        const float* blue() {
            return (const float*) (fStorage->bytes() + fBlue.fOffset);
        }

        sk_sp<SkData> fStorage;
    };
    bool rawTransferFnData(Tables* tables) const;

    static sk_sp<SkData> WriteToICC(const SkColorSpaceTransferFn& fn, const SkMatrix44& toXYZD50);

private:
    SkICC(sk_sp<SkColorSpace> colorSpace);

    sk_sp<SkColorSpace> fColorSpace;

    friend class ICCTest;
};

#endif