AppleWin/source/NTSC_CharSet.cpp

/*
AppleWin : An Apple //e emulator for Windows

Copyright (C) 2010-2011, William S Simms
Copyright (C) 2016, Tom Charlesworth

AppleWin 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 2 of the License, or
(at your option) any later version.

AppleWin 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 AppleWin; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "StdAfx.h"
#include "AppleWin.h"

#include "NTSC_CharSet.h"

unsigned char csbits_enhanced2e[2][256][8];	// Enhanced //e
unsigned char csbits_2e[2][256][8];			// Original //e (no mousetext)
unsigned char csbits_a2[1][256][8];			// ][ and ][+
unsigned char csbits_pravets82[1][256][8];	// Pravets 82
unsigned char csbits_pravets8M[1][256][8];	// Pravets 8M
unsigned char csbits_pravets8C[2][256][8];	// Pravets 8A & 8C

//

static const UINT bitmapWidth = 256;
static const UINT bitmapWidthBytes = bitmapWidth/8;
static const UINT bitmapHeight = 768;

static const UINT charWidth = 16;
static const UINT charWidthBytes = 16/8;
static const UINT charHeight = 16;

static void get_csbits_xy(csbits_t csbits, UINT ch, UINT cx, UINT cy, const BYTE* pBitmap)
{
	_ASSERT(ch < 256);
	_ASSERT((cx < bitmapWidth/charWidth) && (cy < bitmapHeight/charHeight));

	pBitmap += cy*charHeight*bitmapWidthBytes + cx*charWidthBytes;

	for (UINT y=0; y<8; y++)
	{
		BYTE n = 0;
		for (int x=0; x<14; x+=2)
		{
			UINT xp = x/8;
			BYTE d = pBitmap[xp];
			UINT b = 7 - x%8;
			if (d & (1<<b)) n |= 0x80;
			n >>= 1;
		}

		csbits[0][ch][y] = n;
		pBitmap += bitmapWidthBytes*2;
	}
}

static void get_csbits(csbits_t csbits, const char* resourceName, const UINT cy0)
{
	const UINT bufferSize = bitmapWidthBytes*bitmapHeight;
	BYTE* pBuffer = new BYTE [bufferSize];

	HBITMAP hCharBitmap = LoadBitmap(g_hInstance, resourceName);
	GetBitmapBits(hCharBitmap, bufferSize, pBuffer);

	for (UINT cy=cy0, ch=0; cy<cy0+16; cy++)
	{
		for (UINT cx=0; cx<16; cx++)
		{
			get_csbits_xy(csbits, ch++, cx, cy, pBuffer);
		}
	}

	DeleteObject(hCharBitmap);

	delete [] pBuffer;
}

void make_csbits(void)
{
	get_csbits(&csbits_enhanced2e[0], TEXT("CHARSET40"), 0);	// Enhanced //e: Alt char set off
	get_csbits(&csbits_enhanced2e[1], TEXT("CHARSET40"), 16);	// Enhanced //e: Alt char set on (mousetext)
	get_csbits(&csbits_a2[0],         TEXT("CHARSET40"), 32);	// Apple ][, ][+
	get_csbits(&csbits_pravets82[0],  TEXT("CHARSET82"), 0);	// Pravets 82
	get_csbits(&csbits_pravets8M[0],  TEXT("CHARSET8M"), 0);	// Pravets 8M
	get_csbits(&csbits_pravets8C[0],  TEXT("CHARSET8C"), 0);	// Pravets 8A / 8C: Alt char set off
	get_csbits(&csbits_pravets8C[1],  TEXT("CHARSET8C"), 16);	// Pravets 8A / 8C: Alt char set on

	// Original //e is just Enhanced //e with the 32 mousetext chars [0x40..0x5F] replaced by the non-alt charset chars [0x40..0x5F]
	memcpy(csbits_2e, csbits_enhanced2e, sizeof(csbits_enhanced2e));
	memcpy(&csbits_2e[1][64], &csbits_2e[0][64], 32*8);
}