implement some Canvas methods needed for composeUI

src/api-impl/android/graphics/Canvas.java

@@ -488,7 +488,7 @@ public class Canvas {
 
 	public boolean getClipBounds(Rect outRect) {
 		outRect.set(0, 0, 100, 100);
-		return false;
+		return true;
 	}
 
 	private static native long native_canvas_from_bitmap(long pixbuf);

src/api-impl/android/graphics/GskCanvas.java

@@ -89,6 +89,11 @@ public class GskCanvas extends Canvas {
 		drawBitmap(bitmap, src, new Rect((int)dst.left, (int)dst.top, (int)dst.right, (int)dst.bottom), paint);
 	}
 
+	@Override
+	public void drawRoundRect(float left, float top, float right, float bottom, float rx, float ry, Paint paint) {
+		native_drawRoundRect(snapshot, left, top, right, bottom, rx, ry, paint.getColor(), paint.getStrokeWidth());
+	}
+
 	protected native void native_drawBitmap(long snapshot, long texture, int x, int y, int width, int height, int color);
 	protected native void native_drawRect(long snapshot, float left, float top, float right, float bottom, int color);
 	protected native void native_drawPath(long snapshot, long path, long paint);
@@ -98,4 +103,5 @@ public class GskCanvas extends Canvas {
 	protected native void native_restore(long snapshot);
 	protected native void native_drawLine(long snapshot, float startX, float startY, float stopX, float stopY, long paint);
 	protected native void native_drawText(long snapshot, String text, float x, float y, long paint);
+	protected native void native_drawRoundRect(long snapshot, float left, float top, float right, float bottom, float rx, float ry, int color, float strokeWidth);
 }

src/api-impl/android/graphics/Paint.java

@@ -1,5 +1,7 @@
 package android.graphics;
 
+import java.util.Locale;
+
 public class Paint {
 	public static final int ANTI_ALIAS_FLAG           = (1 << 0);
 	public static final int FILTER_BITMAP_FLAG        = (1 << 1);
@@ -185,7 +187,9 @@ public class Paint {
 
 	public /*native*/ int getAlpha() { return 0; }
 	public /*native*/ void setAlpha(int a) {}
-	public /*native*/ float getStrokeWidth() { return 0; }
+	public float getStrokeWidth() {
+		return native_get_stroke_width(skia_paint);
+	}
 
 	public /*native*/ float getStrokeMiter() { return 0; }
 	public /*native*/ void setStrokeMiter(float miter) {}
@@ -202,7 +206,12 @@ public class Paint {
 
 	public void setShadowLayer(float radius, float dx, float dy, int color) {}
 
-	public Xfermode setXfermode(Xfermode xfermode) { return xfermode; }
+	public Xfermode setXfermode(Xfermode xfermode) {
+		if (xfermode instanceof PorterDuffXfermode) {
+			native_set_blendmode(skia_paint, ((PorterDuffXfermode)xfermode).mode.nativeInt);
+		}
+		return xfermode;
+	}
 
 	public void setLetterSpacing(float spacing) {}
 
@@ -290,6 +299,10 @@ public class Paint {
 
 	public Join getStrokeJoin() { return Join.MITER; }
 
+	public Locale getTextLocale() { return Locale.getDefault(); }
+
+	public float getLetterSpacing() { return 1.0f; }
+
 	private native long native_constructor();
 	private native void native_set_antialias(long skia_paint, boolean aa);
 	private native void native_set_color(long skia_paint, int color);
@@ -300,5 +313,7 @@ public class Paint {
 	private static native void native_set_text_size(long skia_font, float size);
 	private static native float native_measure_text(long skia_font, CharSequence text, int start, int end, long skia_paint);
 	private static native void native_set_stroke_width(long skia_font, float width);
+	private static native float native_get_stroke_width(long skia_font);
 	private static native void native_set_style(long skia_paint, int style);
+	private static native void native_set_blendmode(long skia_paint, int mode);
 }

src/api-impl/android/graphics/PorterDuffXfermode.java

@@ -1,5 +1,10 @@
 package android.graphics;
 
 public class PorterDuffXfermode extends Xfermode {
-	public PorterDuffXfermode(PorterDuff.Mode mode) {}
+
+	PorterDuff.Mode mode;
+
+	public PorterDuffXfermode(PorterDuff.Mode mode) {
+		this.mode = mode;
+	}
 }