Android: how to programmatically round only top corners of a bitmap?

android, bitmap, java

Solution

Here is your answer: https://stackoverflow.com/a/5252726/1969801

public static Bitmap getRoundedCornerBitmap(Context context, Bitmap input, int pixels , int w , int h , boolean squareTL, boolean squareTR, boolean squareBL, boolean squareBR  ) {

Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final float densityMultiplier = context.getResources().getDisplayMetrics().density;

final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, w, h);
final RectF rectF = new RectF(rect);

//make sure that our rounded corner is scaled appropriately
final float roundPx = pixels*densityMultiplier;

paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);


//draw rectangles over the corners we want to be square
if (squareTL ){
    canvas.drawRect(0, 0, w/2, h/2, paint);
}
if (squareTR ){
    canvas.drawRect(w/2, 0, w, h/2, paint);
}
if (squareBL ){
    canvas.drawRect(0, h/2, w/2, h, paint);
}
if (squareBR ){
    canvas.drawRect(w/2, h/2, w, h, paint);
}

paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(input, 0,0, paint);

return output;
 }

And the onDraw function:

 @Override
 protected void onDraw(Canvas canvas) {
//super.onDraw(canvas);
    Drawable drawable = getDrawable();

    Bitmap b =  ((BitmapDrawable)drawable).getBitmap() ;
    Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

    int w = getWidth(), h = getHeight();


    Bitmap roundBitmap =  CropImageView.getRoundedCornerBitmap( getContext(), bitmap,10 , w, h , true, false,true, false);
    canvas.drawBitmap(roundBitmap, 0,0 , null);
}

Problem

I'm currently using this code: ``` @Override public Bitmap transform(Bitmap source) { Bitmap result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(result); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, source.getWidth(),source.getHeight()); final RectF rectF = new RectF(rect); final float scale = context.getResources().getDisplayMetrics().density; final float roundDp = 10 * scale; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundDp, roundDp, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(source, rect, rect, paint); source.recycle(); return result; } ``` But the problem is that this method only allows me to modify all 4 corners at once. How would I round only the bottom corners of the image?

Original source

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