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Using SkiaSharp, what is the best way to convert SKCanvas-drawn content into a bitmap?
USUniversity ✭✭
An app I'm working on needs to dynamically generate bitmap images using vector drawing commands. There are two desired targets: a alpha-channel-friendly bitmap file like .PNG and an ImageSource for binding to Xamarin Forms Image controls, creating and updating app-level DynamicResources, etc.
What is the best way to go about this? Do SKBitmap or SKImage objects have a way to convert to a Bitmap or ImageSource object? Does the SKData object need to produce the raw bytes, and then those are used to hydrate a bitmap object?
Best Answers
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MigueldeIcaza
US Xamurai
You should be able to call SKImage'.Encode() method, which will return an SKData.
Then you can create an UnmanagedMemoryStream from the Data/Size properties, and pass that to the Xamarin.Forms.StreamImageSource.
5 -
MigueldeIcaza
US Xamurai
For the next version, I added a convenience AsStream() method on SKData that will allow you to more conveniently get a stream out of an SKData.
2
Answers
You should be able to call SKImage'.Encode() method, which will return an SKData.
Then you can create an UnmanagedMemoryStream from the Data/Size properties, and pass that to the Xamarin.Forms.StreamImageSource.
For the next version, I added a convenience AsStream() method on SKData that will allow you to more conveniently get a stream out of an SKData.
Is there a way to do this in the opposite direction? I am trying to convert an image to an SKCanvas, annotate on it, and then save that annotated SKCanvas as an image.
@MigueldeIcaza
Draw the image into your Canvas.