/// <summary>
/// Create new writeable bitmap.
/// </summary>
/// <param name="size">The size of the bitmap in device pixels.</param>
/// <param name="dpi">The DPI of the bitmap.</param>
/// <param name="format">The pixel format.</param>
/// <param name="alphaFormat">The alpha format.</param>
public WriteableBitmapImpl(PixelSize size, Vector dpi, PixelFormat format, AlphaFormat alphaFormat)
{
PixelSize = size;
Dpi = dpi;
SKColorType colorType = format.ToSkColorType();
SKAlphaType alphaType = alphaFormat.ToSkAlphaType();
var runtimePlatform = AvaloniaLocator.Current?.GetService <IRuntimePlatform>();
if (runtimePlatform != null)
{
_bitmap = new SKBitmap();
var nfo = new SKImageInfo(size.Width, size.Height, colorType, alphaType);
var blob = runtimePlatform.AllocBlob(nfo.BytesSize);
_bitmap.InstallPixels(nfo, blob.Address, nfo.RowBytes, s_releaseDelegate, blob);
}
else
{
_bitmap = new SKBitmap(size.Width, size.Height, colorType, alphaType);
}
_bitmap.Erase(SKColor.Empty);
}
/// <summary>
/// Create immutable bitmap from given pixel data copy.
/// </summary>
/// <param name="size">Size of the bitmap.</param>
/// <param name="dpi">DPI of the bitmap.</param>
/// <param name="stride">Stride of data pixels.</param>
/// <param name="format">Format of data pixels.</param>
/// <param name="alphaFormat">Alpha format of data pixels.</param>
/// <param name="data">Data pixels.</param>
public ImmutableBitmap(PixelSize size, Vector dpi, int stride, PixelFormat format, AlphaFormat alphaFormat, IntPtr data)
{
var imageInfo = new SKImageInfo(size.Width, size.Height, format.ToSkColorType(), alphaFormat.ToSkAlphaType());
_image = SKImage.FromPixelCopy(imageInfo, data, stride);
if (_image == null)
{
throw new ArgumentException("Unable to create bitmap from provided data");
}
PixelSize = size;
Dpi = dpi;
}
