CmdLoadImage - Revision history

Admin: Created page with "= Action = Load a JPEG image. =
2014-12-12T17:13:54Z

Created page with "= <span class="f_Header">Action</span> = Load a JPEG image. <span style="font-family: Arial;"> </span> <span style="font-family: Arial;"> </span> = <span class="..."

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= <span class="f_Header">Action</span> =

Load a JPEG image.

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= <span class="f_Header">Syntax</span> =

<span class="f_Syntax">CmdLoadImage</span><span style="font-weight: bold; color: rgb(0, 0, 128);"> </span>ptr, options

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= <span class="f_Header">Remarks</span> =
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{| cellspacing="0" cellpadding="0" border="0" style="border: none; border-spacing: 0px; border-collapse: collapse;"
|- style="vertical-align: top;"
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ptr

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Destination address

|- style="vertical-align: top;"
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options

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By default, option <span style="font-weight: bold;">OPT_RGB565</span> means the loaded bitmap is in <span style="color: rgb(128, 0, 128);">RGB565</span><span style="color: rgb(128, 0, 128);"> </span>format.

Option <span style="font-weight: bold;">OPT_MONO</span> means the loaded bitmap to be monochrome, in <span style="color: rgb(128, 0, 128);">L8 </span>format.

The command  appends Display List commands to set the source, layout and size of the resulting image.

Option <span style="font-weight: bold;">OPT_NODL</span> prevents this - nothing is written to the display list.

OPT_NODL can be OR'ed with OPT_MONO or OPT_RGB565.

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The data byte should immediately follow in the command buffer. If the number of bytes is not a multiple of 4, then 1, 2 or 3 bytes

should be appended to ensure 4-byte alignment of the next command. These padding bytes can have any value.

The application on the host processor has to parse the JPEG header to get the properties of the JPEG image and decide to decode.  Behavior is unpredictable in cases of non baseline jpeg images or the output data generated is more than the <span style="color: rgb(128, 0, 128);">RAM_G</span> size.

 

 

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= <span class="f_Header">Example</span> =

<source lang="bascomavr">
' See demos - FT800 Demo2.bas, FT800 LoadImage.bas
</source>

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[[Category:FT800 Commands]]