PGdkPixbuf to byte array
lazarus / 39-Graphics

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mrdebug · 2010-05-28 02:34

How can I save a PGdkPixbuf object into a byte array using fpc?
These functions:
Code: [Select]gdk_pixbuf_save_to_buffer
gdk_pixbuf_save_to_bufferv
gdk_pixbuf_save_to_callback
gdk_pixbuf_save_to_callbackvthere aren't in fpc.

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Marc · 2010-05-28 03:40

have a look at gdk_pixbuf_get_pixels (and you may also need
gdk_pixbuf_get_rowstride)

Or do you need more than pixels ?

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mrdebug · 2010-05-28 05:12

I need a way to obtain an array to send at a client.

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Marc · 2010-05-30 16:24

What is the difference between a pointer to a bunch of pixels and an
array of pixels ?

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mrdebug · 2010-05-31 00:31

When you execute the function to obtain the array of pixels you can
select the format of the image in the array (I need jpeg
compression.).
I have extended the gtk2pixbas.pas unit with this code:

Code: [Select]type AByteIn= array of byte;
type PAByteIn= ^AByteIn;

type TGdkPixbufSaveFunc= function(buffer:PChar; count:gsize;
error:PPGError; AAByteIn:PAByteIn): gboolean; cdecl;
function gdk_pixbuf_save_to_callback(pixbuf:PGdkPixbuf;
save_func:TGdkPixbufSaveFunc; data:gpointer; _type:Pchar;
error:PPGError): gboolean; cdecl; external gdkpixbuflib;
The code works well but obtain an jpeg image requires some seconds.
With RGBGraphics libraries obtain a jpeg image requires 150
milliseconds.

Do you now a faster way?