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PCScreenFont.cs
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PCScreenFont.cs
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using System;
using System.Collections.Generic;
using System.Text;
namespace Cosmos.System.Graphics.Fonts
{
/// <summary>
/// Represents a font in the PC Screen Font (PCF) format.
/// </summary>
public class PCScreenFont : Font
{
readonly List<UnicodeMapping> unicodeMappings; // Maps the fonts to the corresponding unicode characters
#region DefaultFontData
// Credit to fcambus https://github.com/fcambus/spleen under BSD-2 License
//
// Copyright (c) 2018-2020, Frederic Cambus
// All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
static PCScreenFont _Default = null;
public static PCScreenFont Default
{
get
{
if(_Default == null)
{
_Default = LoadFont(Convert.FromBase64String("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" +
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"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" +
"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" +
"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" +
"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////w=="));
}
return _Default;
}
}
#endregion
enum PSFVersion1Mode
{
MODE512 = 1,
HASTAB = 2,
HASSEQ = 4,
MAXMODE = 5
}
/// <summary>
/// Initializes a new instance of the <see cref="PCScreenFont"/> class.
/// </summary>
/// <param name="width">The width of a single character in pixels</param>
/// <param name="height">The height of a single character in pixels</param>
/// <param name="data">The PCF data.</param>
/// <param name="unicodeMappings">The mappings of Unicode characters to font indexes.</param>
public PCScreenFont(byte width, byte height, byte[] data, List<UnicodeMapping> unicodeMappings) : base(width, height, data)
{
this.unicodeMappings = unicodeMappings;
}
/// <summary>
/// Loads the given PC Screen Font using the given raw data array.
/// </summary>
/// <param name="fontData">The raw PCF data.</param>
/// <returns></returns>
/// <exception cref="NotImplementedException">Thrown when a PCF version 2 file is provided.</exception>
/// <exception cref="ArgumentException">Thrown when the provided font data is incorrect.</exception>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="fontData"/> is <see langword="null"/>.</exception>
public static PCScreenFont LoadFont(byte[] fontData)
{
byte charHeight;
byte charWidth;
byte[] parsedFontData;
var mappings = new List<UnicodeMapping>();
bool version1 = fontData[0] == 0x36 && fontData[1] == 0x04;
bool version2 = BitConverter.ToUInt32(fontData, 0) == 0x864ab572;
// Check the header
if (!version1 && !version2)
{
Global.Debugger.Send($"PCF load error: Invalid magic {fontData[0]} {fontData[1]} {fontData[2]} {fontData[3]}");
throw new Exception($"Invalid magic value {fontData[0]} {fontData[1]} {fontData[2]} {fontData[3]}.");
}
if (version1)
{
byte mode = fontData[2];
charHeight = fontData[3];
charWidth = 8; //Always 8 in this case
int length = (mode & (int)PSFVersion1Mode.MODE512) == 1 ? 512 : 256;
bool hasUnicodeTable = (mode & (int)PSFVersion1Mode.HASTAB) > 0;
ushort seperator = 0xFFFF;
ushort sequenceStart = 0xFFFE;
parsedFontData = new byte[length * charHeight]; //Every row is one byte
for (int i = 0; i < length; i++)
{
for (int k = 0; k < charHeight; k++)
{
parsedFontData[(i * charHeight) + k] = fontData[4 + (i * charHeight) + k];
}
}
int position = 4 + (length * charHeight);
if (hasUnicodeTable)
{
mappings = new List<UnicodeMapping>();
var currentEntry = new List<byte>();
while (position < fontData.Length)
{
if (BitConverter.ToUInt16(fontData, position) == seperator)
{
var mapping = new UnicodeMapping
{
FontPosition = mappings.Count,
UnicodeCharacters = new List<ushort>(),
UnicodeCharactersWithModifiers = new List<ushort[]>(),
ASCIICharacters = new List<byte>()
};
for (int i = 0; i < currentEntry.Count / 2; i++)
{
mapping.UnicodeCharacters.Add(BitConverter.ToUInt16(currentEntry.ToArray(), i * 2));
}
// At this point we filter combined unicode letters out of the unicode charactesr
bool reachedFirstSeperator = false;
var unicodeCombination = new List<ushort>();
int index = 0;
while (index < mapping.UnicodeCharacters.Count)
{
if (mapping.UnicodeCharacters[index] == sequenceStart)
{
mapping.UnicodeCharacters.RemoveAt(index);
if (!reachedFirstSeperator) {
reachedFirstSeperator = true;
}
else {
mapping.UnicodeCharactersWithModifiers.Add(unicodeCombination.ToArray());
}
}
else
{
if (reachedFirstSeperator) {
unicodeCombination.Add(mapping.UnicodeCharacters[index]);
mapping.UnicodeCharacters.RemoveAt(index);
}
else {
index++;
}
}
}
// Now convert all the unicode characters we can to ASCII
foreach (var uc in mapping.UnicodeCharacters)
{
byte ac = Encoding.ASCII.GetBytes(Encoding.Unicode.GetString(BitConverter.GetBytes(uc)))[0];
if (!(ac == 63 && uc != 0x003F))
{
if (!mapping.ASCIICharacters.Contains(ac)) {
mapping.ASCIICharacters.Add(ac);
}
}
}
mappings.Add(mapping);
currentEntry.Clear();
position++; // Skip the second seperator character as well
}
else
{
currentEntry.Add(fontData[position]);
}
position++;
}
}
return new PCScreenFont(charWidth, charHeight, parsedFontData, mappings);
}
if (version2)
{
uint length = BitConverter.ToUInt32(fontData, 16);
uint height = BitConverter.ToUInt32(fontData, 24);
uint width = BitConverter.ToUInt32(fontData, 28);
charHeight = (byte)height;
charWidth = (byte)width;
uint bytesPerRow = (width + 7) / 8;
uint charDataSize = charHeight * bytesPerRow;
parsedFontData = new byte[length * charDataSize];
for (int i = 0; i < length; i++)
{
for (int k = 0; k < charHeight; k++)
{
int dataIndex = 32 + (i * (byte)charDataSize) + (k * (byte)bytesPerRow);
for (int j = 0; j < bytesPerRow; j++)
{
parsedFontData[(i * charDataSize) + (k * bytesPerRow) + j] = fontData[dataIndex + j];
}
}
}
return new PCScreenFont(charWidth, charHeight, parsedFontData, mappings);
}
throw new ArgumentException("The font data is incorrect.", nameof(fontData));
}
/// <summary>
/// Converts the PC screen font to a VGA font.
/// </summary>
public byte[] CreateVGAFont()
{
byte[] font = new byte[256 * Height * Width / 8];
// Find ' ' and ? char to use index if nothing is found
int emptyOffset = FindASCIIOffset((byte)' ');
int questionMarkOffset = FindASCIIOffset((byte)'?');
for (int i = 0; i < 256; i++)
{
// Find font offset
int offset = FindASCIIOffset((byte)i);
if (offset >= 256) // If nothing was found
{
if (i < 32) {
offset = emptyOffset;
}
else {
offset = questionMarkOffset;
}
}
for (int k = 0; k < Height; k++)
{
font[(i * Height) + k] = Data[(offset * Height) + k];
}
}
return font;
}
private int FindASCIIOffset(byte i)
{
int offset;
for (offset = 0; offset < unicodeMappings.Count; offset++)
{
UnicodeMapping mapping = unicodeMappings[offset];
if (mapping.ASCIICharacters.Contains(i))
{
break;
}
}
return offset;
}
}
/// <summary>
/// Represents a Unicode to font position mapping.
/// </summary>
public struct UnicodeMapping
{
public int FontPosition;
public List<ushort> UnicodeCharacters;
public List<ushort[]> UnicodeCharactersWithModifiers;
public List<byte> ASCIICharacters;
}
}