README.md for SkiaSharp

README.md

@@ -2,6 +2,75 @@
 
 A .NET 8, NativeAOT example on Android.
 
+## Example using SkiaSharp
+
+This sample has a C++ Android Studio project:
+
+* Uses [Native Activity](https://developer.android.com/ndk/samples/sample_na)
+* No Java/Kotlin code
+* Configures OpenGL
+* Calls into C# / managed code
+* Managed code uses SkiaSharp for rendering a random Skia shader
+* Tap input randomly changes the shader
+
+Some screenshots of the Skia content:
+
+<img width="256" src="docs/screenshot1.gif" />
+<img width="256" src="docs/screenshot2.gif" />
+<img width="256" src="docs/screenshot3.gif" />
+
+(Note these look completely smooth on a Pixel 5, I just tried to snap quick gifs with Vysor)
+
+The C# side is a:
+
+* .NET 8 class library
+* Built with RID `linux-bionic-arm64`
+* Uses the SkiaSharp NuGet package, as one would.
+  * Used a nightly build of SkiaSharp, as I wanted a feature from Skia 3.0
+
+## App Size
+
+The release `.apk` file of the SkiaSharp sample is ~4,528kb.
+
+A breakdown of the files inside:
+
+```
+> 7z l app-release.apk
+   Date      Time    Attr         Size   Compressed  Name
+------------------- ----- ------------ ------------  ------------------------
+1981-01-01 01:01:02 .....           56           52  META-INF\com\android\build\gradle\app-metadata.properties
+1981-01-01 01:01:02 .....         1524          753  classes.dex
+1981-01-01 01:01:02 .....      8525024      3733033  lib\arm64-v8a\libSkiaSharp.so
+1981-01-01 01:01:02 .....      1971400       846961  lib\arm64-v8a\libdotnet.so
+1981-01-01 01:01:02 .....        19504         6869  lib\arm64-v8a\libnativeaot.so
+1981-01-01 01:01:02 .....         2376          867  AndroidManifest.xml
+1981-01-01 01:01:02 .....         7778         7778  res\-6.webp
+1981-01-01 01:01:02 .....          548          239  res\0K.xml
+1981-01-01 01:01:02 .....         5696          987  res\0w.xml
+1981-01-01 01:01:02 .....          788          347  res\9s.xml
+1981-01-01 01:01:02 .....          548          239  res\BW.xml
+1981-01-01 01:01:02 .....         1404         1404  res\MO.webp
+1981-01-01 01:01:02 .....         1572          703  res\PF.xml
+1981-01-01 01:01:02 .....         2884         2884  res\Sn.webp
+1981-01-01 01:01:02 .....          982          982  res\d2.webp
+1981-01-01 01:01:02 .....         2898         2898  res\fq.webp
+1981-01-01 01:01:02 .....         5914         5914  res\j_.webp
+1981-01-01 01:01:02 .....         1900         1900  res\qs.webp
+1981-01-01 01:01:02 .....         3844         3844  res\sK.webp
+1981-01-01 01:01:02 .....         3918         3918  res\u5.webp
+1981-01-01 01:01:02 .....         1772         1772  res\yw.webp
+1981-01-01 01:01:02 .....         2036         2036  resources.arsc
+1981-01-01 01:01:02 .....         2085         1127  META-INF\CERT.SF
+1981-01-01 01:01:02 .....         1167         1017  META-INF\CERT.RSA
+1981-01-01 01:01:02 .....         2011         1050  META-INF\MANIFEST.MF
+------------------- ----- ------------ ------------  ------------------------
+1981-01-01 01:01:02           10569629      4629574  25 files
+```
+
+`libdotnet.so` is ~1.9MB, and `libSkiaSharp.so` is ~8.5MB!
+
+## "Hello World" Example
+
 I had this managed code:
 
 ```csharp
@@ -47,9 +116,3 @@ Instead, we can p/invoke into:
 [DllImport("log", EntryPoint = "__android_log_print", CallingConvention = CallingConvention.Cdecl)]
 public static extern int LogPrint(LogPriority priority, string tag, string format);
 ```
-
-## TODO
-
-* `Console.WriteLine()` didn't work inside managed code. Why?
-
-* Try something more complicated. SkiaSharp?