'Fbdev with Xserver'

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List: freedesktop-xorg
Subject: Fbdev with Xserver
From: isaac rajakumar <isaac.raja82 () gmail ! com>
Date: 2020-11-17 7:46:42
Message-ID: CAFjb5OBaj2ua+HWnt6+rb_xJxk3uynAWOVGZAmUHCHUDAQS3YA () mail ! gmail ! com
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[Attachment #2 (multipart/alternative)]

I am having the following configuration

Xlib app-> Xserver -> Framebuffer(ARGB) . When I try to run some Xlib
application nothing is visible in the display.

At the same time when I used dev2mem and punch the data to the framebuffer
memory, I could see the display without issue.

When I specify the format of the framebuffer (565) I could see the GUI in
the screen but a convoluted data. But some GUI is shown.

My observation.

   1.

   When I dumb the memory and check I could see the alpha channel byte is
   0, That means they are switched off by default.
   2.

   When I send the data using devmem I could see the alpha channel enabled.

My question

1.Is it possible that Xserver does not support alpha channel?.

2.If it supports how should I enable it.

3.Can someone point me to a application which can generate ARGB data.

[Attachment #5 (text/html)]

<div dir="ltr"><p class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" style="margin:0px;padding:0px \
0px 0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)">I am having \
the following configuration<p class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" \
style="margin:0px;padding:0.8em 0px \
0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)">Xlib \
app-&gt; Xserver -&gt; Framebuffer(ARGB) . When I try to run some Xlib application \
nothing is visible in the display.<p class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" \
style="margin:0px;padding:0.8em 0px \
0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)">At the same \
time when I used dev2mem and punch the data to the framebuffer memory, I could see \
the display without issue.<p class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" \
style="margin:0px;padding:0.8em 0px \
0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)">When I \
specify the format of the framebuffer (565) I could see the GUI in the screen but a \
convoluted data. But some GUI is shown.<p class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" \
style="margin:0px;padding:0.8em 0px \
0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)"><span \
class="gmail-_12FoOEddL7j_RgMQN0SNeU" \
style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font- \
weight:700;font-stretch:inherit;font-size:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline">My \
observation.<ol class="gmail-_1eJr7K139jnMstd4HajqYP" style="margin:4px \
0px 4px 8px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asia \
n:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;list-style-position:outside;color:rgb(26,26,27)"><li \
class="gmail-_3gqTEjt4x9UIIpWiro7YXz" style="margin:0.4em \
1em;padding:0px;border:0px;font:inherit;vertical-align:baseline">When I \
dumb the memory and check I could see the alpha channel byte is 0, That means they \
are switched off by default.</li><li class="gmail-_3gqTEjt4x9UIIpWiro7YXz" \
style="margin:0.4em 1em;padding:0px;border:0px;font:inherit;vertical-align:baseline">When I \
send the data using devmem I could see the alpha channel enabled.</li></ol><p \
class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" style="margin:0px;padding:0.8em 0px \
0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)"><span \
class="gmail-_12FoOEddL7j_RgMQN0SNeU" \
style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font- \
weight:700;font-stretch:inherit;font-size:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline">My \
question<p class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" \
style="margin:0px;padding:0.8em 0px \
0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)">1.Is it \
possible that Xserver does not support alpha channel?.<p \
class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" style="margin:0px;padding:0.8em 0px \
0.25em;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)">2.If it \
supports how should I enable it.<p class="gmail-_1qeIAgB0cPwnLhDF9XSiJM" \
style="margin:0px;padding:0.8em 0px \
0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:&quot;Noto \
Sans&quot;,Arial,sans-serif;vertical-align:baseline;color:rgb(26,26,27)">3.Can \
someone point me to a application which can generate ARGB data.</div>

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