/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="width">The width of the backing store in pixels.</param>
/// <param name="height">The height of the backing store in pixels.</param>
/// <param name="renderer">GWEN renderer.</param>
public TextRenderer(int width, int height, OpenTKBase renderer)
{
if (width <= 0)
{
throw new ArgumentOutOfRangeException("width");
}
if (height <= 0)
{
throw new ArgumentOutOfRangeException("height");
}
//if (GLFWGraphicsContext.CurrentContext == null)
// throw new InvalidOperationException("No GraphicsContext is current on the calling thread.");
m_Bitmap = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
m_Graphics = System.Drawing.Graphics.FromImage(m_Bitmap);
// NOTE: TextRenderingHint.AntiAliasGridFit looks sharper and in most cases better
// but it comes with a some problems.
//
// 1. Graphic.MeasureString and format.MeasureCharacterRanges
// seem to return wrong values because of this.
//
// 2. While typing the kerning changes in random places in the sentence.
//
// Until 1st problem is fixed we should use TextRenderingHint.AntiAlias... :-(
m_Graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
m_Graphics.Clear(System.Drawing.Color.Transparent);
m_Texture = new Texture(renderer)
{
Width = width, Height = height
};
}
/// <summary>
/// Draws the specified string to the backing store.
/// </summary>
/// <param name="text">The <see cref="System.String"/> to draw.</param>
/// <param name="font">The <see cref="System.Drawing.Font"/> that will be used.</param>
/// <param name="brush">The <see cref="System.Drawing.Brush"/> that will be used.</param>
/// <param name="point">The location of the text on the backing store, in 2d pixel coordinates.
/// The origin (0, 0) lies at the top-left corner of the backing store.</param>
public void DrawString(string text, System.Drawing.Font font, Brush brush, Point point, StringFormat format)
{
if (Configuration.RunningOnMono)
{
// from https://stackoverflow.com/questions/5167937/ugly-looking-text-problem
m_Graphics.DrawString(text, font, Brushes.White, new System.Drawing.Point(point.X, point.Y), format); // render text on the bitmap
var lockData = m_Bitmap.LockBits(new System.Drawing.Rectangle(0, 0, m_Bitmap.Width, m_Bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
unsafe
{
// Pointer to the current pixel
uint *pPixel = (uint *)lockData.Scan0;
// Pointer value at which we terminate the loop (end of pixel data)
var pLastPixel = pPixel + m_Bitmap.Width * m_Bitmap.Height;
uint pixelValue, brightness;
while (pPixel < pLastPixel)
{
// Get pixel data
pixelValue = *pPixel;
// Average RGB
brightness = (((pixelValue & 0xff) + ((pixelValue >> 8) & 0xff) + ((pixelValue >> 16) & 0xff)) * 21845) >> 16; // Division by 3
// Use brightness for alpha value, set R, G, and B 0xff (white)
pixelValue = brightness << 24 | 0xffffff;
// Copy back to image
*pPixel = pixelValue;
// Next pixel
pPixel++;
}
}
m_Bitmap.UnlockBits(lockData);
}
else
{
m_Graphics.DrawString(text, font, brush, new System.Drawing.Point(point.X, point.Y), format); // render text on the bitmap
}
OpenTKBase.LoadTextureInternal(m_Texture, m_Bitmap); // copy bitmap to gl texture
}
/// <summary>
/// Draws the specified string to the backing store.
/// </summary>
/// <param name="text">The <see cref="System.String"/> to draw.</param>
/// <param name="font">The <see cref="System.Drawing.Font"/> that will be used.</param>
/// <param name="brush">The <see cref="System.Drawing.Brush"/> that will be used.</param>
/// <param name="point">The location of the text on the backing store, in 2d pixel coordinates.
/// The origin (0, 0) lies at the top-left corner of the backing store.</param>
public void DrawString(string text, System.Drawing.Font font, Brush brush, Point point, StringFormat format)
{
m_Graphics.DrawString(text, font, brush, new System.Drawing.Point(point.X, point.Y), format); // render text on the bitmap
OpenTKBase.LoadTextureInternal(m_Texture, m_Bitmap); // copy bitmap to gl texture
}
