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VBECanvas.cs
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VBECanvas.cs
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//#define COSMOSDEBUG
using System;
using System.Collections.Generic;
using System.Drawing;
using Cosmos.HAL.Drivers;
namespace Cosmos.System.Graphics
{
/// <summary>
/// VBECanvas class. Used to control screen, by VBE (VESA BIOS Extensions) standard. See also: <seealso cref="Canvas"/>.
/// </summary>
public class VBECanvas : Canvas
{
/// <summary>
/// Default video mode. 1024x768x32.
/// </summary>
private static readonly Mode _DefaultMode = new Mode(1024, 768, ColorDepth.ColorDepth32);
/// <summary>
/// Driver for Setting vbe modes and ploting/getting pixels
/// </summary>
private readonly VBEDriver _VBEDriver;
/// <summary>
/// Video mode.
/// </summary>
private Mode _Mode;
/// <summary>
/// Create new instance of the <see cref="VBEScreen"/> class.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">Thrown if default mode (1024x768x32) is not suppoted.</exception>
public VBECanvas() : this(_DefaultMode)
{
}
/// <summary>
/// Create new instance of the <see cref="VBEScreen"/> class.
/// </summary>
/// <param name="mode">VBE mode.</param>
/// <exception cref="ArgumentOutOfRangeException">Thrown if mode is not suppoted.</exception>
public VBECanvas(Mode aMode)
{
Global.mDebugger.SendInternal($"Creating new VBEScreen() with mode {aMode.Columns}x{aMode.Rows}x{(uint)aMode.ColorDepth}");
if (Core.VBE.IsAvailable())
{
Core.VBE.ModeInfo ModeInfo = Core.VBE.getModeInfo();
aMode = new Mode(ModeInfo.width, ModeInfo.height, (ColorDepth)ModeInfo.bpp);
Global.mDebugger.SendInternal($"Detected VBE VESA with {aMode.Columns}x{aMode.Rows}x{(uint)aMode.ColorDepth}");
}
ThrowIfModeIsNotValid(aMode);
_VBEDriver = new VBEDriver((ushort)aMode.Columns, (ushort)aMode.Rows, (ushort)aMode.ColorDepth);
Mode = aMode;
}
/// <summary>
/// Disables VBE Graphics mode, parent method returns to VGA text mode (80x25)
/// </summary>
public override void Disable()
{
_VBEDriver.DisableDisplay();
}
/// <summary>
/// Get and set video mode.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">(set) Thrown if mode is not suppoted.</exception>
public override Mode Mode
{
get => _Mode;
set
{
_Mode = value;
SetMode(_Mode);
}
}
#region Display
/// <summary>
/// All the available screen modes VBE supports, I would like to query the hardware and obtain from it the list but I have
/// not yet find how to do it! For now I hardcode the most used VESA modes, VBE seems to support until HDTV resolution
/// without problems that is well... excellent :-)
/// </summary>
//public override IReadOnlyList<Mode> AvailableModes { get; } = new List<Mode>
/// <summary>
/// Available VBE supported video modes.
/// <para>
/// Low res:
/// <list type="bullet">
/// <item>320x240x32.</item>
/// <item>640x480x32.</item>
/// <item>800x600x32.</item>
/// <item>1024x768x32.</item>
/// </list>
/// </para>
/// <para>
/// HD:
/// <list type="bullet">
/// <item>1280x720x32.</item>
/// <item>1280x1024x32.</item>
/// </list>
/// </para>
/// <para>
/// HDR:
/// <list type="bullet">
/// <item>1366x768x32.</item>
/// <item>1680x1050x32.</item>
/// </list>
/// </para>
/// <para>
/// HDTV:
/// <list type="bullet">
/// <item>1920x1080x32.</item>
/// <item>1920x1200x32.</item>
/// </list>
/// </para>
/// </summary>
public override List<Mode> AvailableModes { get; } = new List<Mode>
{
new Mode(320, 240, ColorDepth.ColorDepth32),
new Mode(640, 480, ColorDepth.ColorDepth32),
new Mode(800, 600, ColorDepth.ColorDepth32),
new Mode(1024, 768, ColorDepth.ColorDepth32),
/* The so called HD-Ready resolution */
new Mode(1280, 720, ColorDepth.ColorDepth32),
new Mode(1280, 768, ColorDepth.ColorDepth32),
new Mode(1280, 1024, ColorDepth.ColorDepth32),
/* A lot of HD-Ready screen uses this instead of 1280x720 */
new Mode(1366, 768, ColorDepth.ColorDepth32),
new Mode(1680, 1050, ColorDepth.ColorDepth32),
/* HDTV resolution */
new Mode(1920, 1080, ColorDepth.ColorDepth32),
/* HDTV resolution (16:10 AR) */
new Mode(1920, 1200, ColorDepth.ColorDepth32),
};
/// <summary>
/// Override Canvas default graphics mode.
/// </summary>
public override Mode DefaultGraphicMode => _DefaultMode;
/// <summary>
/// Use this to setup the screen, this will disable the console.
/// </summary>
/// <param name="Mode">The desired Mode resolution</param>
/// <exception cref="ArgumentOutOfRangeException">Thrown if mode is not suppoted.</exception>
private void SetMode(Mode aMode)
{
ThrowIfModeIsNotValid(aMode);
ushort xres = (ushort)Mode.Columns;
ushort yres = (ushort)Mode.Rows;
ushort bpp = (ushort)Mode.ColorDepth;
//set the screen
_VBEDriver.VBESet(xres, yres, bpp);
}
#endregion
#region Drawing
/// <summary>
/// Clear screen to specified color.
/// </summary>
/// <param name="color">Color.</param>
public override void Clear(Color aColor)
{
Global.mDebugger.SendInternal($"Clearing the Screen with Color {aColor}");
//if (color == null)
// throw new ArgumentNullException(nameof(color));
/*
* TODO this version of Clear() works only when mode.ColorDepth == ColorDepth.ColorDepth32
* in the other cases you should before convert color and then call the opportune ClearVRAM() overload
* (the one that takes ushort for ColorDepth.ColorDepth16 and the one that takes byte for ColorDepth.ColorDepth8)
* For ColorDepth.ColorDepth24 you should mask the Alpha byte.
*/
switch (_Mode.ColorDepth)
{
case ColorDepth.ColorDepth4:
throw new NotImplementedException();
case ColorDepth.ColorDepth8:
throw new NotImplementedException();
case ColorDepth.ColorDepth16:
throw new NotImplementedException();
case ColorDepth.ColorDepth24:
throw new NotImplementedException();
case ColorDepth.ColorDepth32:
_VBEDriver.ClearVRAM((uint)aColor.ToArgb());
break;
default:
throw new NotImplementedException();
}
}
/*
* As DrawPoint() is the basic block of DrawLine() and DrawRect() and in theory of all the future other methods that will
* be implemented is better to not check the validity of the arguments here or it will repeat the check for any point
* to be drawn slowing down all.
*/
/// <summary>
/// Draw point to the screen.
/// </summary>
/// <param name="aPen">Pen to draw the point with.</param>
/// <param name="aX">X coordinate.</param>
/// <param name="aY">Y coordinate.</param>
/// <exception cref="NotImplementedException">Thrown if color depth is not supported (currently only 32 is supported).</exception>
public override void DrawPoint(Pen aPen, int aX, int aY)
{
Color color = aPen.Color;
uint offset;
/*
* For now we can Draw only if the ColorDepth is 32 bit, we will throw otherwise.
*
* How to support other ColorDepth? The offset calculation should be the same (and so could be done out of the switch)
* ColorDepth.ColorDepth16 and ColorDepth.ColorDepth8 need a conversion from color (an ARGB32 color) to the RGB16 and RGB8
* how to do this conversion faster maybe using pre-computed tables? What happens if the color cannot be converted? We will throw?
*/
switch (Mode.ColorDepth)
{
case ColorDepth.ColorDepth32:
offset = (uint)GetPointOffset(aX, aY);
Global.mDebugger.SendInternal($"Drawing Point of color {color} at offset {offset}");
if (color.A == 0)
{
return;
}
else if (color.A < 255)
{
color = AlphaBlend(color, GetPointColor(aX, aY), color.A);
}
_VBEDriver.SetVRAM(offset, color.B);
_VBEDriver.SetVRAM(offset + 1, color.G);
_VBEDriver.SetVRAM(offset + 2, color.R);
_VBEDriver.SetVRAM(offset + 3, color.A);
Global.mDebugger.SendInternal("Point drawn");
break;
case ColorDepth.ColorDepth24:
offset = (uint)GetPointOffset(aX, aY);
Global.mDebugger.SendInternal($"Drawing Point of color {color} at offset {offset}");
_VBEDriver.SetVRAM(offset, color.B);
_VBEDriver.SetVRAM(offset + 1, color.G);
_VBEDriver.SetVRAM(offset + 2, color.R);
Global.mDebugger.SendInternal("Point drawn");
break;
default:
string errorMsg = "DrawPoint() with ColorDepth " + (int)Mode.ColorDepth + " not yet supported";
throw new NotImplementedException(errorMsg);
}
}
/// <summary>
/// Draw point to the screen.
/// Not implemented.
/// </summary>
/// <param name="aPen">Pen to draw the point with.</param>
/// <param name="aX">X coordinate.</param>
/// <param name="aY">Y coordinate.</param>
/// <exception cref="NotImplementedException">Thrown always (only int coordinats supported).</exception>
public override void DrawPoint(Pen aPen, float aX, float aY)
{
throw new NotImplementedException();
}
/* This is just temp */
/// <summary>
/// Draw array of colors.
/// </summary>
/// <param name="aColors">Colors array.</param>
/// <param name="aX">X coordinate.</param>
/// <param name="aY">Y coordinate.</param>
/// <param name="aWidth">Width.</param>
/// <param name="aHeight">unused.</param>
/// <exception cref="ArgumentOutOfRangeException">Thrown if coordinates are invalid, or width is less than 0.</exception>
/// <exception cref="NotImplementedException">Thrown if color depth is not supported.</exception>
public override void DrawArray(Color[] aColors, int aX, int aY, int aWidth, int aHeight)
{
ThrowIfCoordNotValid(aX, aY);
ThrowIfCoordNotValid(aX + aWidth, aY + aHeight);
for (int i = 0; i < aX; i++)
{
for (int ii = 0; ii < aY; ii++)
{
DrawPoint(new Pen(aColors[i + (ii * aWidth)]), i, ii);
}
}
}
/// <summary>
/// Get point offset.
/// </summary>
/// <param name="x">X coordinate.</param>
/// <param name="y">Y coordinate.</param>
/// <returns>int value.</returns>
private int GetPointOffset(int aX, int aY)
{
Global.mDebugger.SendInternal($"Computing offset for coordinates {aX},{aY}");
int xBytePerPixel = (int)Mode.ColorDepth / 8;
int stride = (int)Mode.ColorDepth / 8;
int pitch = Mode.Columns * xBytePerPixel;
return (aX * stride) + (aY * pitch);
}
/// <summary>
/// Draw filled rectangle.
/// </summary>
/// <param name="aPen">Pen to draw with.</param>
/// <param name="aX">X coordinate.</param>
/// <param name="aY">Y coordinate.</param>
/// <param name="aWidth">Width.</param>
/// <param name="aHeight">Height.</param>
public override void DrawFilledRectangle(Pen aPen, int aX, int aY, int aWidth, int aHeight)
{
int xOffset = GetPointOffset(aX, aY);
int xScreenWidthInPixel = Mode.Columns * ((int)Mode.ColorDepth / 8);
aWidth *= (int)Mode.ColorDepth / 8;
for (int i = 0; i < aHeight; i++)
{
_VBEDriver.ClearVRAM((i * xScreenWidthInPixel) + xOffset, aWidth, aPen.Color.ToArgb());
}
}
/// <summary>
/// Draw image.
/// </summary>
/// <param name="aImage">Image.</param>
/// <param name="aX">X coordinate.</param>
/// <param name="aY">Y coordinate.</param>
public override void DrawImage(Image aImage, int aX, int aY)
{
var xBitmap = aImage.rawData;
var xWidht = (int)aImage.Width;
var xHeight = (int)aImage.Height;
int xOffset = GetPointOffset(aX, aY);
int xScreenWidthInPixel = Mode.Columns * ((int)Mode.ColorDepth / 8);
Global.mDebugger.SendInternal($"Drawing image of size {aImage.Width}x{aImage.Height} array size {aImage.rawData.Length}");
for (int i = 0; i < xHeight; i++)
{
_VBEDriver.CopyVRAM((i * xScreenWidthInPixel) + xOffset, xBitmap, (i * xWidht), xWidht);
}
Global.mDebugger.SendInternal("Done");
}
#endregion
public override void Display()
{
_VBEDriver.Swap();
}
#region Reading
/// <summary>
/// Get point color.
/// </summary>
/// <param name="aX">X coordinate.</param>
/// <param name="aY">Y coordinate.</param>
/// <returns>Color value.</returns>
public override Color GetPointColor(int aX, int aY)
{
uint offset = (uint)GetPointOffset(aX, aY);
return Color.FromArgb((int)_VBEDriver.GetVRAM(offset));
}
#endregion
}
}