/// <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, Paint paint, Point point)
{
m_Canvas.DrawText(text, point.X, point.Y - paint.GetFontMetricsInt().Ascent, paint); // render text on the bitmap
// Fix ugly looking anti-alias
IntPtr data = m_Bitmap.LockPixels();
unsafe
{
// Pointer to the current pixel
uint *pPixel = (uint *)data;
// 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.UnlockPixels();
OpenTK.LoadTextureInternal(m_Texture, m_Bitmap); // copy bitmap to gl texture
}
/// <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, OpenTK renderer)
{
if (width <= 0)
{
throw new ArgumentOutOfRangeException("width");
}
if (height <= 0)
{
throw new ArgumentOutOfRangeException("height");
}
m_Bitmap = Bitmap.CreateBitmap(width, height, Bitmap.Config.Argb8888);
m_Bitmap.EraseColor(0);
m_Canvas = new Canvas(m_Bitmap);
//m_Canvas.DrawColor(global::Android.Graphics.Color.Transparent);
m_Texture = new Texture(renderer)
{
Width = width, Height = height
};
}
