4.0.4 r1.2中android.graphics.drawable.Drawable源代码
Set to true to have the drawable dither its colors when drawn to a device with fewer than 8-bits per color component. This can improve the look on those devices, but can also slow down the drawing a little. public void setDither(boolean dither) {}
4.0.4 r1.2中android.graphics.drawable.BitmapDrawable源代码
@Override public void setDither(boolean dither) { mBitmapState.mPaint.setDither(dither); invalidateSelf(); }
4.0.4 r1.2中android.graphics.Paint源代码
Helper for setFlags(), setting or clearing the DITHER_FLAG bit Dithering affects how colors that are higher precision than the device are down-sampled. No dithering is generally faster, but higher precision colors are just truncated down (e.g. 8888 -> 565). Dithering tries to distribute the error inherent in this process, to reduce the visual artifacts. Parameters: dither true to set the dithering bit in flags, false to clear it public native void setDither(boolean dither);
最后调用本地类库进行处理。