public ImmutableBitmap(Stream stream, int decodeSize, bool horizontal, BitmapInterpolationMode interpolationMode)
{
using (var skStream = new SKManagedStream(stream))
using (var codec = SKCodec.Create(skStream))
{
var info = codec.Info;
// get the scale that is nearest to what we want (eg: jpg returned 512)
var supportedScale = codec.GetScaledDimensions(horizontal ? ((float)decodeSize / info.Width) : ((float)decodeSize / info.Height));
// decode the bitmap at the nearest size
var nearest = new SKImageInfo(supportedScale.Width, supportedScale.Height);
var bmp = SKBitmap.Decode(codec, nearest);
// now scale that to the size that we want
var realScale = horizontal ? ((double)info.Height / info.Width) : ((double)info.Width / info.Height);
SKImageInfo desired;
if (horizontal)
{
desired = new SKImageInfo(decodeSize, (int)(realScale * decodeSize));
}
else
{
desired = new SKImageInfo((int)(realScale * decodeSize), decodeSize);
}
if (bmp.Width != desired.Width || bmp.Height != desired.Height)
{
if (bmp.Height != bmp.Width)
{
}
var scaledBmp = bmp.Resize(desired, interpolationMode.ToSKFilterQuality());
bmp.Dispose();
bmp = scaledBmp;
}
_image = SKImage.FromBitmap(bmp);
bmp.Dispose();
if (_image == null)
{
throw new ArgumentException("Unable to load bitmap from provided data");
}
PixelSize = new PixelSize(_image.Width, _image.Height);
// TODO: Skia doesn't have an API for DPI.
Dpi = new Vector(96, 96);
}
}
public ImmutableBitmap(ImmutableBitmap src, PixelSize destinationSize, BitmapInterpolationMode interpolationMode)
{
SKImageInfo info = new SKImageInfo(destinationSize.Width, destinationSize.Height, SKColorType.Bgra8888);
SKImage output = SKImage.Create(info);
src._image.ScalePixels(output.PeekPixels(), interpolationMode.ToSKFilterQuality());
_image = output;
PixelSize = new PixelSize(_image.Width, _image.Height);
// TODO: Skia doesn't have an API for DPI.
Dpi = new Vector(96, 96);
}
/// <inheritdoc />
public void DrawBitmap(IRef <IBitmapImpl> source, double opacity, Rect sourceRect, Rect destRect, BitmapInterpolationMode bitmapInterpolationMode)
{
var drawableImage = (IDrawableBitmapImpl)source.Item;
var s = sourceRect.ToSKRect();
var d = destRect.ToSKRect();
using (var paint =
new SKPaint
{
Color = new SKColor(255, 255, 255, (byte)(255 * opacity * _currentOpacity))
})
{
paint.FilterQuality = bitmapInterpolationMode.ToSKFilterQuality();
drawableImage.Draw(this, s, d, paint);
}
}
public WriteableBitmapImpl(Stream stream, int decodeSize, bool horizontal, BitmapInterpolationMode interpolationMode)
{
using (var skStream = new SKManagedStream(stream))
using (var skData = SKData.Create(skStream))
using (var codec = SKCodec.Create(skData))
{
var info = codec.Info;
// get the scale that is nearest to what we want (eg: jpg returned 512)
var supportedScale = codec.GetScaledDimensions(horizontal ? ((float)decodeSize / info.Width) : ((float)decodeSize / info.Height));
// decode the bitmap at the nearest size
var nearest = new SKImageInfo(supportedScale.Width, supportedScale.Height);
var bmp = SKBitmap.Decode(codec, nearest);
// now scale that to the size that we want
var realScale = horizontal ? ((double)info.Height / info.Width) : ((double)info.Width / info.Height);
SKImageInfo desired;
if (horizontal)
{
desired = new SKImageInfo(decodeSize, (int)(realScale * decodeSize));
}
else
{
desired = new SKImageInfo((int)(realScale * decodeSize), decodeSize);
}
if (bmp.Width != desired.Width || bmp.Height != desired.Height)
{
var scaledBmp = bmp.Resize(desired, interpolationMode.ToSKFilterQuality());
bmp.Dispose();
bmp = scaledBmp;
}
_bitmap = bmp;
PixelSize = new PixelSize(bmp.Width, bmp.Height);
Dpi = SkiaPlatform.DefaultDpi;
}
}