it turns out any color value is set to 1 unless the alpha value is
0xFF
in which case the colors are untouched (as they should be for
all values of A!)
shall I report a bug?
On Oct 17, 10:31 am, kristianlm <[EMAIL PROTECTED]> wrote:
> Hi folks!
>
> After some struggle loading semi-transparent png files, I have come to
> realize there (probably) is something wrong with the
> android.graphics.Bitmap get and setPixel functions. When I run the
> following code:
>
> Bitmap b = Bitmap.createBitmap(2, 2, Bitmap.Config.ARGB_8888);
>
> b.setPixel(0, 0, 0xFF00FF00);
> Log.v("pixel", "1. " + Integer.toHexString(b.getPixel(0, 0)));
>
> b.setPixel(0, 1, 0x8000FF00);
> Log.v("pixel", "2. " + Integer.toHexString(b.getPixel(0, 1)));
>
> b.setPixel(1, 0, 0x0000FF00);
> Log.v("pixel", "3. " + Integer.toHexString(b.getPixel(1, 0)));
>
> I get
>
> 10-17 10:24:30.028: VERBOSE/pixel(926): 1. ff00ff00
> 10-17 10:24:30.058: VERBOSE/pixel(926): 2. 80000100
> 10-17 10:24:30.068: VERBOSE/pixel(926): 3. 0
>
> *note: ints are ARGB where the first byte specifies the alpha, second
> the red component etc.
>
> Why does my green component dissappear? I should have 8 bits for both
> green and alpha, and
> I see no reason why it should be cleared, and even less understandable
> why it is set to when
> there is 50% transparency (2nd output).
>
> So, is this a bug or have I missed out on the fundamentals?
> Kris
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