android - Applying a BitmapShader using relative coordinates when using canvas.drawBitmap -

i'm trying use bitmapshader draw on canvas. have 2 images of same dimensions (one alfa channel , 1 rgb), want draw on canvas created same size. problem seem though canvas.drawbitmap users absolute coordinates paint. there way draw relative coordinates.

public class maskedimagedrawable extends drawable {     private final bitmap mmask;      private final paint mpaint = new paint();      public maskedimagedrawable(bitmap mask, bitmap image) {         mmask = mask;          shader targetshader =             new bitmapshader(image, shader.tilemode.clamp, shader.tilemode.clamp);         mpaint.setshader(targetshader);     }      @override     public void draw(canvas canvas) {         canvas.drawbitmap(mmask, 0.0f, 0.0f, mpaint);     }      @override     public int getopacity() {         return pixelformat.translucent;     }      @override     public void setalpha(int alpha) {         mpaint.setalpha(alpha);     }      @override     public void setcolorfilter(colorfilter cf) {         mpaint.setcolorfilter(cf);     } } 

i can't seem able drawable's absolute coordinates on screen. know can use getlocationonscreen/inwindow view holds drawable doesn't take animations account.

i tried tried applying relative coordinates applying translation on shader in onboundschange coordinates here seems relative well.

  matrix mtranslationmatrix =  new matrix()    @override   protected void onboundschange(rect bounds) {       super.onboundschange(bounds);       mtranslationmatrix.settranslate(bounds.left, bounds.top);       mpaint.getshader().setlocalmatrix(mtranslationmatrix);   } 

as reference - seems drawrect same paint use relative coordinates. replacing draw method following render rgb image on drawable correctly (but not mask)

@override public void draw(canvas canvas) {     // getbounds returns relative coordinates     canvas.drawrect(getbounds, mpaint); } 

it seems hw acceleration issue. disabling hw acceleration on view moves shader relative coordinates.

if (android.os.build.version.sdk_int >= 11) {     myview.disablehwacceleration(); }