As the title said, anyone know what is RGBX_8888 pixel format? and what is the difference with RGBA_8888? Is RGBA_8888 offers an alpha channel but RGBX_8888 does not?
The android documentation does not give much information on this unfortunately.
Thanks.
RGBX means, that the pixel format still has an alpha channel, but it is ignored, and is always set to 255.
Some reference:
Blackberry PixelFormat (It is not android, however I guess that the naming conventions stay same across platforms.)
The RGBX 32 bit RGB format is stored in memory as 8 red bits, 8 green bits, 8 blue bits, and 8 ignored bits.
Android 4.1.2 source code (texture.cpp) Line 80
There is a function called PointSample, where it samples based on a template format, and the passed parameters. You can see, that at pixelformat RGBX_8888, the alpha channel is ignored and set to 255, while at RGBA_8888, it is normally sampled.
if (GGL_PIXEL_FORMAT_RGBA_8888 == format)
*sample = *(data + index);
else if (GGL_PIXEL_FORMAT_RGBX_8888 == format)
{
*sample = *(data + index);
*sample |= 0xff000000;
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With