surface.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/>.
 *
 *
 * This file is dual-licensed.
 * In addition to the GPLv3 license mentioned above, this code is also
 * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
 * full text of the license.
 *
 */

#ifndef GOB_SURFACE_H
#define GOB_SURFACE_H

#include "common/scummsys.h"
#include "common/ptr.h"
#include "common/rational.h"
#include "common/rect.h"

namespace Common {
class SeekableReadStream;
}

namespace Gob {

enum ImageType {
    kImageTypeNone = -1,
    kImageTypeTGA  =  0,
    kImageTypeIFF,
    kImageTypeBRC,
    kImageTypeBMP,
    kImageTypeJPEG
};

class Pixel {
public:
    Pixel(byte *vidMem, uint8 bpp, byte *min, byte *max);

    Pixel &operator++();
    Pixel operator++(int x);

    Pixel &operator--();
    Pixel operator--(int x);

    Pixel &operator+=(int x);
    Pixel &operator-=(int x);

    uint32 get() const;
    void set(uint32 p);

    bool isValid() const;

private:
    byte *_vidMem;
    byte *_min, *_max;
    uint8 _bpp;
};

class ConstPixel {
public:
    ConstPixel(const byte *vidMem, uint8 bpp, const byte *min, const byte *max);

    ConstPixel &operator++();
    ConstPixel operator++(int x);

    ConstPixel &operator--();
    ConstPixel operator--(int x);

    ConstPixel &operator+=(int x);
    ConstPixel &operator-=(int x);

    uint32 get() const;

    bool isValid() const;

private:
    const byte *_vidMem;
    const byte *_min, *_max;
    uint8 _bpp;
};

class Surface {
public:
    Surface(uint16 width, uint16 height, uint8 bpp, byte *vidMem = 0);
    Surface(uint16 width, uint16 height, uint8 bpp, const byte *vidMem);
    ~Surface();

    uint16 getWidth () const;
    uint16 getHeight() const;
    uint8  getBPP   () const;

    byte *getData(uint16 x = 0, uint16 y = 0);
    const byte *getData(uint16 x = 0, uint16 y = 0) const;

    void resize(uint16 width, uint16 height);

    void setBPP(uint8 bpp);

    Pixel get(uint16 x = 0, uint16 y = 0);
    ConstPixel get(uint16 x = 0, uint16 y = 0) const;

    void blit(const Surface &from, int16 left, int16 top, int16 right, int16 bottom,
              int16 x, int16 y, int32 transp = -1, bool yAxisReflexion = false);
    void blit(const Surface &from, int16 x, int16 y, int32 transp = -1);
    void blit(const Surface &from, int32 transp = -1);

    void blitScaled(const Surface &from, int16 left, int16 top, int16 right, int16 bottom,
                    int16 x, int16 y, Common::Rational scale, int32 transp = -1);
    void blitScaled(const Surface &from, int16 x, int16 y, Common::Rational scale, int32 transp = -1);
    void blitScaled(const Surface &from, Common::Rational scale, int32 transp = -1);

    void fillRect(int16 left, int16 top, int16 right, int16 bottom, uint32 color);
    void fillArea(int16 left, int16 top, int16 right, int16 bottom, uint32 fillColor, uint32 backgroundColor);
    Common::Rect fillAreaAtPoint(int16 left, int16 top, uint32 fillColor);
    void fill(uint32 color);
    void clear();

    void shadeRect(uint16 left, uint16 top, uint16 right, uint16 bottom,
            uint32 color, uint8 strength);

    void recolor(uint8 from, uint8 to);

    void putPixel(uint16 x, uint16 y, uint32 color);
    void drawLine(uint16 x0, uint16 y0, uint16 x1, uint16 y1, uint32 color);
    void drawRect(uint16 left, uint16 top, uint16 right, uint16 bottom, uint32 color);
    void drawCircle(uint16 x0, uint16 y0, uint16 radius, uint32 color, int16 pattern = 0);

    void blitToScreen(uint16 left, uint16 top, uint16 right, uint16 bottom, uint16 x, uint16 y) const;

    bool loadImage(Common::SeekableReadStream &stream);
    bool loadImage(Common::SeekableReadStream &stream, ImageType type);

    static ImageType identifyImage(Common::SeekableReadStream &stream);

private:
    uint16 _width;
    uint16 _height;
    uint8  _bpp;

    bool  _ownVidMem;
    byte *_vidMem;

    static bool clipBlitRect(int16 &left, int16 &top, int16 &right, int16 &bottom, int16 &x, int16 &y,
                             uint16 dWidth, uint16 dHeight, uint16 sWidth, uint16 sHeight);

    bool loadTGA (Common::SeekableReadStream &stream);
    bool loadIFF (Common::SeekableReadStream &stream);
    bool loadBRC (Common::SeekableReadStream &stream);
    bool loadBMP (Common::SeekableReadStream &stream);
    bool loadJPEG(Common::SeekableReadStream &stream);
};

typedef Common::SharedPtr<Surface> SurfacePtr;

} // End of namespace Gob

#endif // GOB_SURFACE_H