Difference between revisions of "I.MX6 Framebuffer Overlay"

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(Instructions)
 
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** here we move overlay to (200,200):<pre class="apf"># ./fb_alpha -x 200 -y 200</pre>
 
** here we move overlay to (200,200):<pre class="apf"># ./fb_alpha -x 200 -y 200</pre>
 
** same but with no transparency: <pre class="apf"># ./fb_alpha -x 200 -y 200 -g 1 -a 255</pre>
 
** same but with no transparency: <pre class="apf"># ./fb_alpha -x 200 -y 200 -g 1 -a 255</pre>
 +
** same with alpha color/key set to GREEN: <pre class="apf"># ./fb_alpha -x 200 -y 200 -g 1 -a 255 -k 0x00FF00</pre>
  
 
[[Category:Framebuffer]]
 
[[Category:Framebuffer]]

Latest revision as of 14:07, 20 April 2017

Page under construction... Construction.png Informations on this page are not guaranteed !!

i.MX6 offers hardware composition of 2 framebuffers for video output. Here are the instructions on how to use it.

Note Note: These instructions are only available on APF6 with 3.14 Freescale kernel (apf6legacy_defconfig)


Tools

  • you will need to compile following tools:
$ cd target/demos/fb_alpha
$ ../../../buildroot/output/host/usr/bin/arm-linux-gnueabihf-gcc -o fb_alpha fb_alpha.c
  • install fb_alpha on your board's rootfs

Instructions

  • Display something on main Framebuffer (/dev/fb0), here the stream from an analog camera:
# modprobe adv7280_tvin
# modprobe mxc_v4l2_capture
# gst-launch-1.0 imxv4l2videosrc ! imxg2dvideosink &
  • Then activate auxiliary Framebuffer (/dev/fb1):
# echo 0 > /sys/class/graphics/fb1/blank
  • and put it some stuff on it:
# fb-test -f 1 &
  • then you can set alpha/overlay parameters with fb_alpha tool:
    • here we move overlay to (200,200):
      # ./fb_alpha -x 200 -y 200
    • same but with no transparency:
      # ./fb_alpha -x 200 -y 200 -g 1 -a 255
    • same with alpha color/key set to GREEN:
      # ./fb_alpha -x 200 -y 200 -g 1 -a 255 -k 0x00FF00