display_a2.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/>.
 *
 */

#include "adl/display.h"

#ifndef ADL_DISPLAY_A2_H
#define ADL_DISPLAY_A2_H

namespace Adl {

class Display_A2 : public Display {
public:
    Display_A2();
    ~Display_A2() override;

    enum {
        kGfxWidth = 280,
        kGfxHeight = 192,
        kGfxPitch = kGfxWidth / 7,
        kGfxSize = kGfxPitch * kGfxHeight,
        kTextWidth = 40,
        kTextHeight = 24,
        kSplitHeight = 32
    };

    void init() override;

    // Graphics
    uint getGfxWidth() const { return kGfxWidth; }
    uint getGfxHeight() const { return kGfxHeight; }
    uint getGfxPitch() const { return kGfxPitch; }
    void loadFrameBuffer(Common::ReadStream &stream, byte *dst) const ;
    void loadFrameBuffer(Common::ReadStream &stream);
    void putPixel(const Common::Point &p, byte color);
    void setPixelByte(const Common::Point &p, byte color);
    void setPixelBit(const Common::Point &p, byte color);
    void setPixelPalette(const Common::Point &p, byte color);
    byte getPixelByte(const Common::Point &p) const;
    bool getPixelBit(const Common::Point &p) const;
    void clear(byte color);

    // Text
    char asciiToNative(char c) const override { return c | 0x80; }
    void printChar(char c) override;
    void showCursor(bool enable) override;

protected:
    class TextReader {
    public:
        static uint16 getBits(const Display_A2 *display, uint y, uint x) {
            const uint charPos = (y >> 3) * kTextWidth + x;
            byte m = display->_textBuf[charPos];
            byte b = _font[m & 0x3f][y % 8];

            if (display->_showCursor && charPos == display->_cursorPos) {
                if (!display->_enableApple2eCursor) {
                    m = (m & 0x3f) | 0x40;
                } else {
                    if (display->_blink) {
                        byte cursor[] = {
                            0x00, 0x00, 0x2a, 0x14,
                            0x2a, 0x14, 0x2a, 0x00
                        };

                        b = cursor[y % 8];
                    }
                }
            }

            if (!(m & 0x80) && (!(m & 0x40) || display->_blink))
                b = ~b;

            return b & 0x7f;
        }

        static uint8 getStartY(const Display_A2 *display) {
            if (display->_mode == kModeText)
                return 0;
            else
                return kGfxHeight - kSplitHeight;
        }

        static uint8 getEndY(const Display_A2 *display) { return kGfxHeight; }
    };

    class GfxReader {
    public:
        static uint16 getBits(const Display_A2 *display, uint y, uint x) {
            return display->_frameBuf[y * kGfxPitch + x];
        }

        static uint8 getStartY(const Display_A2 *display) { return 0; }

        static uint8 getEndY(const Display_A2 *display) {
            if (display->_mode == kModeGraphics)
                return kGfxHeight;
            else
                return kGfxHeight - kSplitHeight;
        }
    };

    byte *_frameBuf;
    bool _showCursor;
    bool _enableColor;
    bool _enableScanlines;
    bool _enableMonoText;
    bool _enableApple2eCursor;
    bool _blink;

private:
    void writeFrameBuffer(const Common::Point &p, byte color, byte mask);

    static const byte _font[64][8];
};

Display_A2 *Display_A2_create();

} // End of namespace Adl

#endif