public SharpDX.Direct2D1.Bitmap LoadFromFile(RenderTarget renderTarget, System.Drawing.Bitmap bitmap)
{
SharpDX.Direct2D1.Bitmap match;
if (_cache.TryGetValue(bitmap, out match))
{
return(match);
}
var sourceArea = new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height);
var bitmapProperties = new BitmapProperties(new PixelFormat(Format.R8G8B8A8_UNorm, AlphaMode.Premultiplied));
var size = new Size2(bitmap.Width, bitmap.Height);
// Transform pixels from BGRA to RGBA
int stride = bitmap.Width * sizeof(int);
using (var tempStream = new DataStream(bitmap.Height * stride, true, true))
{
// Lock System.Drawing.Bitmap
var bitmapData = bitmap.LockBits(sourceArea, ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
// Convert all pixels
for (int y = 0; y < bitmap.Height; y++)
{
int offset = bitmapData.Stride * y;
for (int x = 0; x < bitmap.Width; x++)
{
// Not optimized
byte B = Marshal.ReadByte(bitmapData.Scan0, offset++);
byte G = Marshal.ReadByte(bitmapData.Scan0, offset++);
byte R = Marshal.ReadByte(bitmapData.Scan0, offset++);
byte A = Marshal.ReadByte(bitmapData.Scan0, offset++);
int rgba = R | (G << 8) | (B << 16) | (A << 24);
tempStream.Write(rgba);
}
}
bitmap.UnlockBits(bitmapData);
tempStream.Position = 0;
match = new SharpDX.Direct2D1.Bitmap(renderTarget, size, tempStream, stride, bitmapProperties);
_cache.TryAdd(bitmap, match);
}
return(match);
}
