pan_bitmap.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 BAGEL_BAGLIB_PAN_BITMAP_H
#define BAGEL_BAGLIB_PAN_BITMAP_H

#include "bagel/boflib/gfx/bitmap.h"
#include "bagel/boflib/fixed.h"

namespace Bagel {

#define MAX_DIV_VIEW (12.8 / 3)     // Ratio for 480x380 Screen
#define DEF_FOV (360 / MAX_DIV_VIEW) //    1TO1 Paint FOV

class CBagPanBitmap : public CBofBitmap {
public:
    enum Direction {
        kDirNONE = 0x0,
        kDirUP = 0x01,
        kDirDOWN = 0x02,
        kDirLEFT = 0x04,
        kDirRIGHT = 0x08,
        kDirVIEW = 0x10
    };

private:
    CBofRect _xCurrView;      // Viewport Window size (0->Width-1,0->Height-1,1->Width+Width/4,1->Height)
    double _xFOVAngle;        // Field of view in radians
    CBofPoint _xRotateRate;   // Rate of rotation on increment left, right ...
    bool _bActiveScrolling;   // True when there should be screen updates
    bool _bPanorama;          // True when the bitmap is a 360 panorama
    Direction _xDirection;    // Set direction for next update
    int _nCorrWidth;          // Size of each correction band
    CBofFixed *_pCosineTable; // Lookup table for cosine values
    int _nNumDegrees;         // Number of lookups in the cosine table
    bool _bIsValid;           // Is the bmp a valid object

    void normalizeViewSize();
    void generateCosineTable();

public:
    CBagPanBitmap(const char *pszFileName, CBofPalette *pPalette, const CBofRect &xViewSize = CBofRect());
    virtual ~CBagPanBitmap();

    bool isValid() const {
        return _bIsValid;
    }
    bool isPan() const {
        return _bPanorama;
    }

    ErrorCode paint(CBofBitmap *pBmp, CBofPoint xDstOffset = CBofPoint(0, 0));
    ErrorCode paintUncorrected(CBofBitmap *pBmp, CBofRect &dstRect);
    ErrorCode paintWarped(CBofBitmap *pBmp, const CBofRect &dstRect, const CBofRect &srcRect, int offset = 0, CBofBitmap *pSrcBmp = nullptr, const CBofRect &preSrcRect = CBofRect());
    
    CBofRect getWarpSrcRect();
    CBofPoint warpedPoint(CBofPoint &xPoint);

    const CBofRect getMaxView(CBofSize s = CBofSize(640, 480));

    void setCorrWidth(int nWidth, bool bUpdate = true);

    void rotateRight(int nXRotRate = 0);
    void rotateLeft(int nXRotRate = 0);
    void rotateUp(int nYRotRate = 0);
    void rotateDown(int nYRotRate = 0);

    Direction updateView();

    void setCurrView(const CBofRect &xCurrView);
    void offsetCurrView(const CBofPoint &xOffset);
    void setFOV(double degrees, bool bUpdate = true);

    void setViewSize(const CBofSize &xViewSize, bool bUpdate = true);
    CBofSize setUnityViewSize();
    double setUnityFOV();

    double getFOV() const {
        return _xFOVAngle;
    }
    const CBofSize getViewSize() const {
        return CBofPoint(_xCurrView.size());
    }
    const CBofRect getCurrView() const {
        return _xCurrView;
    }

    Direction getDirection() const {
        return _xDirection;
    }

    void setRotateRate(const CBofPoint &xRotRate) {
        _xRotateRate = xRotRate;
    }
    void setDirection(const Direction xDirection) {
        _xDirection = xDirection;
    }
    int getCorrWidth() {
        return _nCorrWidth;
    }

    void activateScrolling(bool val = true) {
        _bActiveScrolling = val;
    }
    void deActivateScrolling() {
        activateScrolling(false);
    }

};

} // namespace Bagel

#endif