Have a look at the agg_2D unit. The agg_2D uses
..
agg_pixfmt ,
agg_pixfmt_rgba ,
..
Therefore, the rgba format is pretty much baked in. That is to say that
the constructor of the main object Agg2D uses the pixfmt_rgba32 to set
the pixel format.
...
{ CONSTRUCT }
constructor Agg2D.Construct;
begin
m_rbuf.Construct;
pixfmt_rgba32 (m_pixFormat ,@m_rbuf );
pixfmt_custom_blend_rgba(m_pixFormatComp ,@m_rbuf
,@comp_op_adaptor_rgba ,rgba_order );
pixfmt_rgba32 (m_pixFormatPre ,@m_rbuf );
pixfmt_custom_blend_rgba(m_pixFormatCompPre ,@m_rbuf
,@comp_op_adaptor_rgba ,rgba_order );
...
There is another agg unit agg_pixfmt_rgb_packed that seem to have the
565 format that you need. Add it to the uses list and try to replace the
pixfmt_rgba32 calls with pixfmt_rgb565. That will make agg use that format.
The pixfmt_custom_blend_rgba calls may need further hacking too to make
things work, however, Agg2D should use a 16 bit format if you use
pixfmt_rgb565 callse instead of pixfmt_rgba32. You should also set
RGBA_Width =2; in your program to reflect the change.
Anyway, this will probably still not make
ptcgraph.putimage(0,0,buf[0],0);
work, but that may be a ptcgraph problem.
Hope this helps,
Stefan
On 05/31/2017 02:57 PM, James Richters wrote:
And AggPas already has support for that pixel format
How do I define that as the format I want? I've been looking all through the
example and do not see how this is defined. I've attached a test program, it's
basically Graeme's sample but going to screen instead of a file. I just don't
see where the pixel format is defined. I have it kind of working in a funny
way by just forcing the existing pixels to conform to the required format.
-----Original Message-----
From: fpc-pascal [mailto:fpc-pascal-boun...@lists.freepascal.org] On Behalf Of
Graeme Geldenhuys
Sent: Wednesday, May 31, 2017 1:17 PM
To: fpc-pascal@lists.freepascal.org
Subject: Re: [fpc-pascal] Implementing AggPas with PtcGraph
On 2017-05-31 18:03, Reimar Grabowski wrote:
I'm not sure what that's called
RGB565, maybe?
And AggPas already has support for that pixel format.
Regards,
Graeme
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