public WriteableBitmapImpl(PixelSize size, Vector dpi, PixelFormat?format = null)
{
PixelSize = size;
Dpi = dpi;
var colorType = PixelFormatHelper.ResolveColorType(format);
var runtimePlatform = AvaloniaGlobals.RuntimePlatform;
if (runtimePlatform != null)
{
_bitmap = new SKBitmap();
var nfo = new SKImageInfo(size.Width, size.Height, colorType, SKAlphaType.Premul);
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, SKAlphaType.Premul);
}
_bitmap.Erase(SKColor.Empty);
}
/// <summary>
/// Create new writeable bitmap.
/// </summary>
/// <param name="width">Width.</param>
/// <param name="height">Height.</param>
/// <param name="format">Format.</param>
public WriteableBitmapImpl(int width, int height, PixelFormat?format = null)
{
PixelHeight = height;
PixelWidth = width;
var colorType = PixelFormatHelper.ResolveColorType(format);
var runtimePlatform = AvaloniaLocator.Current?.GetService <IRuntimePlatform>();
if (runtimePlatform != null)
{
_bitmap = new SKBitmap();
var nfo = new SKImageInfo(width, height, colorType, SKAlphaType.Premul);
var blob = runtimePlatform.AllocBlob(nfo.BytesSize);
_bitmap.InstallPixels(nfo, blob.Address, nfo.RowBytes, null, s_releaseDelegate, blob);
}
else
{
_bitmap = new SKBitmap(width, height, colorType, SKAlphaType.Premul);
}
_bitmap.Erase(SKColor.Empty);
}
/// <summary>
/// Create image info for given parameters.
/// </summary>
/// <param name="width">Width.</param>
/// <param name="height">Height.</param>
/// <param name="format">Format.</param>
/// <returns></returns>
private static SKImageInfo MakeImageInfo(int width, int height, PixelFormat?format)
{
var colorType = PixelFormatHelper.ResolveColorType(format);
return(new SKImageInfo(Math.Max(width, 1), Math.Max(height, 1), colorType, SKAlphaType.Premul));
}
