nximage Display NuttX Logo

This is a simple example that just puts the NuttX logo image in the center of the display. This only works for RGB23 (888), RGB16 (656), RGB8 (332), and 8-bit greyscale for now.

• CONFIG_NSH_BUILTIN_APPS – Build the NXIMAGE example as a built-in that can be executed from the NSH command line.

• CONFIG_EXAMPLES_NXIMAGE_VPLANE – The plane to select from the frame- buffer driver for use in the test. Default: 0.

• CONFIG_EXAMPLES_NXIMAGE_DEVNO – The LCD device to select from the LCD driver for use in the test: Default: 0.

• CONFIG_EXAMPLES_NXIMAGE_BPP – Pixels per pixel to use. Valid options include 8, 16 and 24. Default is 16.

• CONFIG_EXAMPLES_NXIMAGE_XSCALEp5, CONFIG_EXAMPLES_NXIMAGE_XSCALE1p5 or CONFIG_EXAMPLES_NXIMAGE_XSCALE2p0 – The logo image width is 160 columns. One of these may be defined to rescale the image horizontally by .5, 1.5 or 2.0.

• CONFIG_EXAMPLES_NXIMAGE_YSCALEp5, CONFIG_EXAMPLES_NXIMAGE_YSCALE1p5 or CONFIG_EXAMPLES_NXIMAGE_YSCALE2p0 – The logo image height is 160 rows. One of these may be defined to rescale the image vertically by .5, 1.5 or 2.0.

• CONFIG_EXAMPLES_NXIMAGE_GREYSCALE – Grey scale image. Default: RGB.

How was that run-length encoded image produced?

1. I used GIMP output the image as a .c file.

2. I added some C logic to palette-ize the RGB image in the GIMP .c file.

3. Then I add some simple run-length encoding to palette-ized image.

But now there is a tool that can be found in the NxWidgets package at NxWidgets/tools/bitmap_converter.py that can be used to convert any graphics format to the NuttX RLE format.

Note: As of this writing, most of the pixel depth, scaling options, and combinations thereof have not been tested.