pi1541/Screen.h

// Pi1541 - A Commodore 1541 disk drive emulator
// Copyright(C) 2018 Stephen White
//
// This file is part of Pi1541.
// 
// Pi1541 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.
// 
// Pi1541 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 Pi1541. If not, see <http://www.gnu.org/licenses/>.

#ifndef SCREEN_H
#define SCREEN_H

#include "types.h"

typedef u32 RGBA;

#define RED(colour)   ( (u8)(((u32)colour) & 0xFF) )
#define GREEN(colour)  ( (u8)(((u32)colour >> 8) & 0xFF) )
#define BLUE(colour)    ( (u8)(((u32)colour >> 16) & 0xFF) )
#define ALPHA(colour)  ( (u8)(((u32)colour >> 24) & 0xFF) )

#define RGBA(r, g, b, a)  ( ((u32)((u8)(r))) | ((u32)((u8)(g)) << 8) | ((u32)((u8)(b)) << 16) | ((u32)((u8)(a)) << 24) )

class Screen
{

public:
	Screen()
		: opened(false)
		, width(0)
		, height(0)
		, bpp(0)
		, pitch(0)
		, framebuffer(0)
	{
	}

	void Open(u32 width, u32 height, u32 colourDepth);

	void ClearArea(u32 x1, u32 y1, u32 x2, u32 y2, RGBA colour);
	void Clear(RGBA colour);

	void ScrollArea(u32 x1, u32 y1, u32 x2, u32 y2);

	void WriteChar(bool petscii, u32 x, u32 y, unsigned char c, RGBA colour);
	u32 PrintText(bool petscii, u32 xPos, u32 yPos, char *ptr, RGBA TxtColour = RGBA(0xff, 0xff, 0xff, 0xff), RGBA BkColour = RGBA(0, 0, 0, 0xFF), bool measureOnly = false, u32* width = 0, u32* height = 0);
	u32 MeasureText(bool petscii, char *ptr, u32* width = 0, u32* height = 0);

	void DrawLine(u32 x1, u32 y1, u32 x2, u32 y2, RGBA colour);
	void DrawLineV(u32 x, u32 y1, u32 y2, RGBA colour);
	void PlotPixel(u32 x, u32 y, RGBA colour);

	void PlotImage(u32* image, int x, int y, int w, int h);

	u32 Width() const { return width; }
	u32 Height() const { return height; }

	u32 GetCBMFontHeight();

private:

	typedef void (Screen::*PlotPixelFunction)(u32 pixel_offset, RGBA Colour);

	void PlotPixel32(u32 pixel_offset, RGBA Colour);
	void PlotPixel24(u32 pixel_offset, RGBA Colour);
	void PlotPixel16(u32 pixel_offset, RGBA Colour);
	void PlotPixel8(u32 pixel_offset, RGBA Colour);

	void ClipRect(u32& x1, u32& y1, u32& x2, u32& y2);

	PlotPixelFunction plotPixelFn;

	bool opened;
	u32 width;
	u32 height;
	u32 bpp;
	u32 pitch;
	volatile u8* framebuffer;
};

#endif