CODEWITHSUNDEEP
android
Josiah
Josiah

Reputation: 423

Android - Draw bitmap as one color

I have several bitmaps (game sprites) which I'd like to draw into another bitmap, however each non-transparent pixel of the source bitmap should be drawn using a single color, ignoring the original pixel color of the source. Basically, I'm trying to use the sprite as a "stamp" of a single color to be drawn into the destination bitmap.

I believe I should be using canvas.drawBitmap (Bitmap bitmap, Matrix matrix, Paint paint), however I'm not exactly sure how I should initialize the paint object. Is this approach correct?

Upvotes: 5

Views: 3958

Answers (2)

Snailer
Snailer

Reputation: 3839

You don't need to perform as many steps as Romain Guy suggests, just initialize your paint with the desired color, and use Paint.setColorFilter() with PorterDuff.Mode.SRC_ATOP

myPaint.setColorFilter(new PorterDuffColorFilter(myColor, PorterDuff.Mode.SRC_ATOP));

Upvotes: 15

Romain Guy
Romain Guy

Reputation: 98521

If your destination bitmap is transparent, draw all your sprites inside that bitmap normally (you can use a null Paint.) Then, draw a filled rectangle that covers the entire bitmap, using the Porter-Duff xfermode called SrcIn (Source In.)

Upvotes: 1

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