I'm trying to mask Bitmap with gradient alpha at bottom. Gradient size are fixed and independed of Bitmap size. But it draws incorrect: bottom of gradient at top, than top. What's wrong?
There is sample code:
final int GRADIENT_HEIGHT = 32;
public Bitmap addGradient(Bitmap src) {
int w = src.getWidth();
int h = src.getHeight();
Bitmap overlay = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(overlay);
canvas.drawBitmap(src, 0, 0, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, 0, 0, GRADIENT_HEIGHT, 0xFFFFFFFF, 0x00FFFFFF, TileMode.REPEAT);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, h - GRADIENT_HEIGHT, w, h, paint);
return overlay;
}
Thanks!
Change your LinearGradient to this:
LinearGradient shader = new LinearGradient(0, h - GRADIENT_HEIGHT, 0, h, 0xFFFFFFFF, 0x00FFFFFF, Shader.TileMode.CLAMP);
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