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0141_256 Color 320x200 BMP Loader.pas
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Pascal/Delphi Source File
|
1995-03-03
|
2KB
|
96 lines
{
320x200x256c BMP loader
written by:
.--------- Simon R Bowser ------- aka Pinrut -----------.
| Department of Computer Science, Aberdeen University |
| E-Mail: u04srb@abdn.ac.uk |
| Simon.Bowser@launchpad.unc.edu |
`-------------------------------------------------------'
This code if FREEWARE, do with it as you will.
note: this ONLY works for 320x200 images
}
Procedure LoadBMP(Name:String;where:word);
type
Virtual = Array [1..64000] of byte;
VAR
PicBuf: ^Virtual;
Data:File;
RGB:ARRAY[0..255,1..4] OF Byte;
Header:Array[1..54] of Byte;
aAddr :word;
I:Byte;
{x,y:integer;}
Procedure SetPal(Col,R,G,B : Byte); assembler;
asm
mov dx,3c8h
mov al,[col]
out dx,al
inc dx
mov al,[r]
out dx,al
mov al,[g]
out dx,al
mov al,[b]
out dx,al
end;
BEGIN
GetMem (PicBuf,64000);
Assign(Data,Name); Reset(Data,1);
BlockRead(Data,Header,54); { read and ignore :) }
BlockRead(Data,RGB,1024); { pal info }
FOR I:=0 TO 255 DO
SetPal(I,RGB[I,3] div 4,RGB[I,2] div 4,RGB[I,1] div 4);
BlockRead(Data,PicBuf^,64000);
Close(Data);
aAddr := seg (PicBuf^);
asm {AMS routine 2.7 times faster than Pascal one!}
push si {wibble, wobble ;) }
push di {I'm no ASM, programmer so there MUST me room}
push es {for optimisation}
push ds
mov es, [where]
mov ds, [aAddr]
mov di, 0
mov dx, 63680
mov cx, 200
@page:
push cx
mov cx, 320
mov si, dx
@line:
mov bh, byte ptr ds:[si]
mov es:[di], bh
inc di
inc si
loop @line
sub dx, 320
pop cx
loop @page
pop ds
pop es
pop di
pop si
end;
{ for y:=0 to 199 do
for x:=0 to 319 do
Mem[where:y*320+x] := Mem[aAddr:(199-y)*320+x];}
FreeMem(PicBuf,64000);
END;
begin
asm mov ax,0013h;int 10h; end; { set MCGA }
LoadBMP('whatever.bmp',$A000);
{ repeat until keypressed; (use crt) }
end.