The finished product. I found a working formula on the apple site.
http://www.devworld.apple.com/documentation/Performance/Conceptual/vImage/Chapter8/chapter_8_section_3.html
SuperStrict
Framework BRL.LinkedList
Import BRL.Pixmap
Import BRL.PNGLoader
Import BRL.StandardIO
'output.png 46 46 tile.png 0 0 letter.png 0 0 score.png 92 0
'output.png 30 30 test1.png 0 0 test2.png 0 0
Type ttilemaker
Field pixmap:tpixmap
Field output:String
Field width:Int
Field height:Int
Field layers:tlist = CreateList()
Method Save()
Local array:Int[,,]
Local layer:tlayer
For layer = EachIn layers
If array = Null
array = PixmapToPixelArray(layer.pixmap,layer.x,layer.y)
Else
CombinePixelArrays(array,PixmapToPixelArray(layer.pixmap,layer.x,layer.y))
End If
Next
SavePixelArray(array,output)
End Method
Method PixmapToPixelArray:Int[,,](pixmap:tpixmap,offsetx:Int=0,offsety:Int=0)
Local x:Int
Local y:Int
Local array:Int[width,height,4]
Local pixel:Int
For y = 0 Until height
For x = 0 Until width
pixel = ReadPixel(pixmap,x+offsetx,y+offsety)
array[x,y,0] = GetA(pixel)
array[x,y,1] = GetR(pixel)
array[x,y,2] = GetG(pixel)
array[x,y,3] = GetB(pixel)
Next
Next
Return array
End Method
Method CombinePixelArrays:Int[,,](bottom:Int[,,],top:Int[,,])
'this function will take 2 pixel arrays [x,y,rgba] and combine them.
Local x:Int
Local y:Int
Local a:Float
Local r:Float
Local g:Float
Local b:Float
For y = 0 Until height
For x = 0 Until width
If top[x,y,0] = 255
a = 255
r = top[x,y,1]
g = top[x,y,2]
b = top[x,y,3]
ElseIf top[x,y,0] = 0
a = bottom[x,y,0]
r = bottom[x,y,1]
g = bottom[x,y,2]
b = bottom[x,y,3]
Else
a = (top[x,y,0] * 255 + (255 - top[x,y,0]) * bottom[x,y,0] + 127) / 255
r = (top[x,y,0] * top[x,y,1] + (((255 - top[x,y,0]) * bottom[x,y,0] + 127) / 255) * bottom[x,y,1] + 127) / a
g = (top[x,y,0] * top[x,y,2] + (((255 - top[x,y,0]) * bottom[x,y,0] + 127) / 255) * bottom[x,y,2] + 127) / a
b = (top[x,y,0] * top[x,y,3] + (((255 - top[x,y,0]) * bottom[x,y,0] + 127) / 255) * bottom[x,y,3] + 127) / a
End If
bottom[x,y,0] = a
bottom[x,y,1] = r
bottom[x,y,2] = g
bottom[x,y,3] = b
Next
Next
End Method
Method SavePixelArray:Int(array:Int[,,],url:Object)
Local x:Int
Local y:Int
Local savepixmap:tpixmap = CreatePixmap(width,height,PF_BGRA8888)
For y = 0 Until height
For x = 0 Until width
WritePixel(savepixmap,x,y,GetRGBA(array[x,y,1],array[x,y,2],array[x,y,3],array[x,y,0]))
Next
Next
SavePixmapPNG(savepixmap,url)
End Method
Method GetRGBA:Int(r:Int,g:Int,b:Int,a:Int=255)
Return r | (g Shl 8) | (b Shl 16) | (a Shl 24)
End Method
Method GetA:Int(argb:Int)
Return argb Shr 24 & %11111111
End Method
Method GetR:Int(argb:Int)
Return argb & %11111111
End Method
Method GetG:Int(argb:Int)
Return argb Shr 8 & %11111111
End Method
Method GetB:Int(argb:Int)
Return argb Shr 16 & %11111111
End Method
End Type
Function CreateTileMaker:ttilemaker()
If appargs.length < 5 Return Null
Local tilemaker:ttilemaker = New ttilemaker
tilemaker.output = AppArgs[1]
tilemaker.width = AppArgs[2].toint()
tilemaker.height = AppArgs[3].toint()
Local arg:Int = 4
Local layer:tlayer
While arg <= appargs.length - 3
layer = New tlayer
layer.pixmap = LoadPixmapPNG(AppArgs[arg])
If layer.pixmap = Null Return Null
layer.x = AppArgs[arg+1].toint()
layer.y = AppArgs[arg+2].toint()
tilemaker.layers.addlast(layer)
arg:+3
Wend
tilemaker.pixmap = CreatePixmap(tilemaker.width,tilemaker.height,PF_BGRA8888)
Return tilemaker
End Function
Type tlayer
Field pixmap:tpixmap
Field x:Int
Field y:Int
End Type
'-----------------------------------------------------
Local tilemaker:ttilemaker = CreateTileMaker()
If tilemaker <> Null
tilemaker.Save()
Print "RESULT=1"
Else
Print "RESULT=0"
End If
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