Try this, it uses memcopy.
I'm not sure if my clipping code is correct, please correct it if you know better :)
tidbits:
Images draw about 3 times quicker than pixmaps, but locking/unlocking images can KILL the framerate, that's why I'm doing 100 in a loop.
Images, or was it pixmaps?, undergo a conversion if their format isn't the same as the default context which is usualy PF_RGBA8888, so it's worthwhile converting loaded images/pixmaps to the same as the screen format. John Devoy tested this and said it was at least twice as fast in a drawing loop after converting. (I think it was pixmaps now :)
Graphics 1024,768,32,0
Global FPS, RFPS,LastSEcs ' Frame Counter Stuff
SeedRnd MilliSecs()
Local imga:TImage=LoadImage("d:\t.jpg",DYNAMICIMAGE)
Local imgb:TImage=CreateImage(imga.width,imga.height,1,imga.flags)
bglSetSwapInterval(0) ' Disable vsync
Local t:Int=0
While Not KeyHit(KEY_ESCAPE)
CheckFPS()
If Keyhit(KEY_SPACE)
Local a:TPixmap=LockImage(imga)
Local b:TPixmap=LockImage(imgb)
For i=0 To 99
CopyRect(Rand(0,200),Rand(0,300),64,64,Rand(0,300),Rand(0,300),a,b)
Next
UnlockImage(imga)
UnlockImage(imgb)
End If
t:+1
Cls
DrawImage imga,MouseX(),MouseY()
DrawImage imgb,600,MouseY()
Local mem_alloced=MemAlloced(),mem_usage=MemUsage()
DrawText "MemAlloced="+mem_alloced+" MemUsage="+mem_usage,0,0
DrawText "FPS: "+RFPS,0,24
DrawText "Hit SPACE to do 100 CopyRects()",0,48
Flip
FlushMem
Wend
Function CopyRect(srcX:Int, srcY:Int, srcW:Int, srcH:Int, dstX:Int, dstY:Int, s:TPixmap, d:TPixmap)
If srcX > s.width Or srcY > s.height Return ' Source x,y within width/height?
If dstX > d.width Or dstY > d.height Return ' Dest..........
Local sBytes:Int
Local dBytes:Int
Select s.format
Case PF_RGBA8888
sBytes=4
Case PF_BGRA8888
sBytes=4
Default
sBytes=3
End Select
Select d.format
Case PF_RGBA8888
dBytes=4
Case PF_BGRA8888
dBytes=4
Default
dBytes=3
End Select
If sBytes<>dBytes Return ' don't even go there! :)
Local srcP:Byte Ptr = s.pixels
Local dstP:Byte Ptr = d.pixels
' Clip?
If (srcX + srcW) > s.width Then srcW = s.width - srcX
If (srcY + srcH) > s.height Then srcY = s.height - srcY
' Will source rect fit in dest image?
If srcW > (d.width - dstX) Then srcW = d.width - dstX
If srcH > (d.height - dstY) Then srcH = d.height - dstY
For y=0 To srcH-1
MemCopy(dstP + ((dstY+y) * d.pitch) + (dstX * dBytes), srcP + ((srcY+y) * s.pitch) + (srcX * sBytes),srcW * sBytes)
Next
End Function
Function CheckFPS()
If (MilliSecs()-lastsecs) <1000 Then
fps = fps +1
Else
lastsecs = MilliSecs()
rfps = fps
fps = 0
EndIf
End Function
Tom
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