xref: /external/skia/src/core/SkBitmapController.h

/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkBitmapController_DEFINED
#define SkBitmapController_DEFINED

#include "SkBitmap.h"
#include "SkBitmapCache.h"
#include "SkFilterQuality.h"
#include "SkMatrix.h"

class SkBitmapProvider;

/**
 *  Handles request to scale, filter, and lock a bitmap to be rasterized.
 */
class SkBitmapController : ::SkNoncopyable {
public:
    class State : ::SkNoncopyable {
    public:
        virtual ~State() {}

        const SkPixmap& pixmap() const { return fPixmap; }
        const SkMatrix& invMatrix() const { return fInvMatrix; }
        SkFilterQuality quality() const { return fQuality; }

    protected:
        SkPixmap        fPixmap;
        SkMatrix        fInvMatrix;
        SkFilterQuality fQuality;

    private:
        friend class SkBitmapController;
    };

    virtual ~SkBitmapController() {}

    State* requestBitmap(const SkBitmapProvider&, const SkMatrix& inverse, SkFilterQuality,
                         void* storage, size_t storageSize);

    State* requestBitmap(const SkBitmapProvider& bp, const SkMatrix& inv, SkFilterQuality quality) {
        return this->requestBitmap(bp, inv, quality, nullptr, 0);
    }

protected:
    virtual State* onRequestBitmap(const SkBitmapProvider&, const SkMatrix& inv, SkFilterQuality,
                                   void* storage, size_t storageSize) = 0;
};

///////////////////////////////////////////////////////////////////////////////////////////////////

#include "SkMipMap.h"

class SkDefaultBitmapController : public SkBitmapController {
public:
    enum class CanShadeHQ { kNo, kYes };
    SkDefaultBitmapController(CanShadeHQ canShadeHQ)
        : fCanShadeHQ(canShadeHQ == CanShadeHQ::kYes) {}

protected:
    State* onRequestBitmap(const SkBitmapProvider&, const SkMatrix& inverse, SkFilterQuality,
                           void* storage, size_t storageSize) override;
    bool fCanShadeHQ;
};

#endif