>AggPas doesn't care where or what the data buffer is, as long as you tell
>AggPas where to start, width, height and stride.
> So use GetImage, assign that buffer to a pointer. Increment the pointer by (3
> *Size(Word)) and give that pointer to agg.Attach().
The data is preceded by 3 Longints, not words... sorry for my mistake.
I understand the concept but I'm having difficulty getting the syntax right.
What I Think I am doing is setting a pointer for my GetImage/Putimage then
defining a second pointer that is 3 Longints into the Getimage/Putimage pointer
for use with AggPas...
Here is the a sample program that works with the non-dynamic variable
{$mode objfpc}{$H+}
uses
shlobj,
ptcgraph,
ptccrt,
sysutils,
agg_pixfmt_rgb_packed,
agg_2D;
const
RGB_WIDTH =2;
Clock_W = 120;
Clock_h = 40;
type
TClockBitmapBuffer=packed record
width,
height,
reserved :longint;
data :array[0..(Clock_W+1) * (Clock_H+1)] of word;
end;
var
Newtime,Oldtime : Double;
Bufsize : Longint;
gd,gm : smallint;
aggClock,aggClock2 : Agg2D_ptr;
Font2use,FontPath : Array[0..MaxPathLen] of Char;
clockbuffer_Original : TClockBitmapbuffer;
clockbuffer_with_time : Tclockbitmapbuffer;
Aggclockbuffer : TClockbitmapbuffer;
Begin
gd:=d16Bit;
gm:=m800x600;
ptcgraph.Initgraph(gd,gm,'');
SHGetSpecialFolderPath(0,FontPath,CSIDL_FONTS,false);
font2use:=FontPath+'\Lucon.ttf';
GetImage((GetMaxX-4)-Clock_W+1, 4, GetMaxX-4, 4+Clock_H-1,
ClockBuffer_original);
ClockBuffer_With_Time:=ClockBuffer_original;
New(aggClock , Construct(@pixfmt_rgb565));
aggClock^.attach(@Clockbuffer_with_time.data,Clock_W, Clock_H, -Clock_W *
RGB_WIDTH);
aggclock^.Font(font2use ,12 );
aggclock^.LineColor($FF ,$FF ,$00 );
aggclock^.FillColor($FF ,$FF ,$60 );
Repeat
Newtime:=now;
If Trunc(Newtime*346600)<>Trunc(Oldtime*345600) Then //update every 1/4
second
Begin
OldTime:=NewTime;
ClockBuffer_With_Time:=ClockBuffer_original;
aggclock^.Text(2 ,19,FormatDateTime('hh:nn:ssam/pm',Now));
Putimage((GetMaxX-4)-Clock_W, 4, Clockbuffer_With_Time , normalPut);
End;
until keypressed;
End.
Here is my attempt to define it with a dynamic variable.. It compiles, but when
I try to run it I get an access violation and runtime error 217
I'm pretty sure I’m not assigning the pointer for Aggclockbuffer correctly and
I don't think I'm attaching it to AggPas correctly either.
Corrections are greatly appreciated.
{$mode objfpc}{$H+}
uses
shlobj,
ptcgraph,
ptccrt,
sysutils,
agg_pixfmt_rgb_packed,
agg_2D;
const
RGB_WIDTH =2;
Clock_W = 120;
Clock_h = 40;
Var
Newtime,Oldtime : Double;
Bufsize : Longint;
gd,gm : smallint;
aggClock,aggClock2 : Agg2D_ptr;
Font2use,FontPath : Array[0..MaxPathLen] of Char;
clockbuffer_Original : ^Byte;
clockbuffer_with_time : ^Byte;
Aggclockbuffer : ^Byte;
Begin
gd:=d16Bit;
gm:=m800x600;
ptcgraph.Initgraph(gd,gm,'');
SHGetSpecialFolderPath(0,FontPath,CSIDL_FONTS,false);
font2use:=FontPath+'\Lucon.ttf';
bufSize:=ImageSize((GetMaxX-4)-Clock_W, 4 , GetMaxX-4, 4+Clock_H);
GetMem(ClockBuffer_Original, bufSize); { Allocate memory on heap }
GetImage((GetMaxX-4)-Clock_W+1, 4, GetMaxX-4, 4+Clock_H-1,
ClockBuffer_original^);
ClockBuffer_With_Time:=ClockBuffer_original;
AggClockbuffer^:=ClockBuffer_With_Time^+3*Sizeof(Longint); //Set
AggClockBuffer to be 3 Longints past ClockBuffer_with_time
New(aggClock , Construct(@pixfmt_rgb565));
aggClock^.attach(@AggClockbuffer,Clock_W, Clock_H, -Clock_W * RGB_WIDTH);
//Try to use AggClockbuffer pointer with AggPas
aggclock^.Font(font2use ,12 );
aggclock^.LineColor($FF ,$FF ,$00 );
aggclock^.FillColor($FF ,$FF ,$60 );
Repeat
Newtime:=now;
If Trunc(Newtime*346600)<>Trunc(Oldtime*345600) Then //update every 1/4
second
Begin
OldTime:=NewTime;
ClockBuffer_With_Time:=ClockBuffer_original;
aggclock^.Text(2 ,19,FormatDateTime('hh:nn:ssam/pm',Now));
Putimage((GetMaxX-4)-Clock_W, 4, Clockbuffer_With_Time^ , normalPut);
End;
until KeyPressed;
End.
James
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