diskimage.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef MEDIASTATION_ACTORS_DISKIMAGE_H
#define MEDIASTATION_ACTORS_DISKIMAGE_H

#include "mediastation/actor.h"
#include "mediastation/bitmap.h"
#include "mediastation/datafile.h"
#include "mediastation/mediascript/scriptvalue.h"
#include "mediastation/mediascript/scriptconstants.h"

namespace MediaStation {

struct StripInfoNode {
    bool isLoaded = false;
    bool isLoadScheduled = false;
    Common::Rect rect;
    uint streamId = 0;
    uint lengthInBytes = 0;
};

struct StripImageNode {
    bool isLoaded = false;
    PixMapImage *image = nullptr;
    uint lastDrawTime = 0;
};

// Despite the name from the original, this is not a "disk image" but
// a set of graphics (like a large background) that are streamed from
// disk in a very particular way.
class DiskImageActor : public SpatialEntity, public ChannelClient {
public:
    DiskImageActor() : SpatialEntity(kActorTypeDiskImage) {};
    ~DiskImageActor();

    virtual void readParameter(Chunk &chunk, ActorHeaderSectionType paramType) override;
    virtual ScriptValue callMethod(BuiltInMethod methodId, Common::Array<ScriptValue> &args) override;

    virtual void onEvent(const ActorEvent &event) override;
    virtual void timerEvent(const TimerEvent &event) override;

    virtual void readChunk(Chunk &chunk) override;
    virtual void draw(DisplayContext &displayContext) override;
    virtual void preload(const Common::Rect &rect, bool fireStepEvent = true) override;
    virtual bool isReadyToDraw(DisplayContext &displayContext) override;
    virtual bool isRectInMemory(const Common::Rect &rectToCheck) override;
    virtual void setAdjustedBounds(CylindricalWrapMode wrapMode) override;

private:
    void setStripInfo(Chunk &chunk);
    void setStripsToLoad(const Common::Rect &rectToLoad);
    int getStripToLoad();
    void startStripLoad(uint stripIndex);

    void purge();
    void stopLoad();
    void unloadLeastRecentlyDrawnStrip();
    void debugPrintNodes();

    Common::HashMap<uint, StripInfoNode> _stripInfoNodes;
    Common::HashMap<uint, StripImageNode> _stripImageNodes;

    Common::Rect _rectToLoad;
    bool _shouldDecompressInPlace = false;
    bool _isLoading = false;
    bool _isLoadingStrips = false;
    bool _firePreloadEvent = false;
    uint _maxStripsInMemory = 0;
    int16 _stripThickness = 0;
    uint _maxImagesInMemory = 0;
    bool _useVerticalStrips = false;
};

} // End of namespace MediaStation

#endif