ReferenceError when trying to Cache a GeClipMap
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Hello,
I'm trying to create a crude example of caching the Bitmaps/GeClipMaps and I'm running into an error I can't seem to solve. In the code below,self.UpdateBackgroundCache()
works, butself.UpdateBoxCache()
does not. In this function, I'm creating a GeClipMap, initializing it, drawing a rectangle, and storing the clipmap's BaseBitmap as a property of the GeUserArea. I keep getting the error:ReferenceError: the object 'c4d.bitmaps.BaseBitmap' is not alive
Can anyone help me understand what is going wrong? Thank you!
import c4d from c4d import gui,bitmaps GADGET_ID_GEUSERAREA = 10000 def drawColorBitmap(w,h,r,g,b): r = int(r * 255) g = int(g * 255) b = int(b * 255) bmp = bitmaps.BaseBitmap() bmp.Init(w, h, 24) for wPixel in range(w): for hPixel in range(h): bmp.SetPixel(wPixel, hPixel, r, g, b) return bmp class MyUserArea(c4d.gui.GeUserArea): def __init__(self): self.boxX = 50 self.boxY = 50 self.boxWidth = 50 self.boxHeight = 50 self.boxAngle = 0 self.boxOpacity = 1.0 self.bgCache = None self.boxCache = None def UpdateBackgroundCache(self,x2,y2): self.bgCache = drawColorBitmap(x2,y2,0.35,0.35,0.35) def UpdateBoxCache(self): rMap = c4d.bitmaps.GeClipMap() rMap.Init(self.boxWidth, self.boxHeight) rMap.BeginDraw() rMap.SetDrawMode(c4d.GE_CM_DRAWMODE_BLEND, c4d.GE_CM_SRC_MAX_OPACITY) rMap.SetColor(255,0,0,255) rMap.FillRect(0,0,50,self.boxHeight) rMap.EndDraw() self.boxCache = rMap.GetBitmap() def GetMinSize(self): return 300,150 def UpdateCache(self): #Cache Background if self.bgCache == None: self.UpdateBackgroundCache(self.GetWidth(),self.GetHeight()) #Cache Red Box if self.boxCache == None: self.UpdateBoxCache() #Blit Red Box with Background clipMap = bitmaps.GeClipMap() clipMap.InitWithBitmap(self.bgCache, None) clipMap.BeginDraw() clipMap.SetDrawMode(c4d.GE_CM_DRAWMODE_BLEND, c4d.GE_CM_SRC_MAX_OPACITY) rectMap = bitmaps.GeClipMap() rectMap.InitWithBitmap(self.boxCache, None) clipMap.Blit(self.boxX, self.boxY, rectMap, 0, 0, self.boxWidth, self.boxHeight, rop = c4d.GE_CM_BLIT_COL) clipMap.EndDraw() bmp = clipMap.GetBitmap() return bmp def DrawMsg(self, x1, y1, x2, y2, msg): cache = self.UpdateCache() self.DrawBitmap(cache, x1, y1, x2, y2, 0, 0, 300, 150, c4d.BMP_NORMAL | c4d.BMP_ALLOWALPHA) class ExampleDialog(c4d.gui.GeDialog): geUserArea = MyUserArea() def CreateLayout(self): self.SetTitle("ClipMap") self.AddUserArea(GADGET_ID_GEUSERAREA, c4d.BFH_CENTER | c4d.BFH_SCALE | c4d.BFV_CENTER | c4d.BFV_SCALE, 300, 150) self.AttachUserArea(self.geUserArea, GADGET_ID_GEUSERAREA) return True def main(): global dlg dlg = ExampleDialog() dlg.Open(c4d.DLG_TYPE_ASYNC, defaultw=400, defaulth=250, xpos=-2, ypos=-2) if __name__=='__main__': main()
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Hi @blastframe,
thank you for reaching out to us. The error
ReferenceError: the object 'xyz' is not alive
means that something has deallocated the object you are trying to reference. This happens because you have two competing memory management systems, one provided by Python, itsgc
, and one provided by Cinema's C++ API. In this case the methodGeClipMap.GetBitmap()
(Link to C++ Doc) only does return a pointer, i.e. an object that is owned by theGeClipMap
. To avoid the error, you have either to avoid theGeClipMap
being garbage collected or clone the bitmap so that you have full ownership. I "fixed" your code by just plastering in two.GetClone()
.Cheers,
Ferdinandimport c4d from c4d import gui,bitmaps GADGET_ID_GEUSERAREA = 10000 FOO = None def drawColorBitmap(w,h,r,g,b): r = int(r * 255) g = int(g * 255) b = int(b * 255) bmp = bitmaps.BaseBitmap() bmp.Init(w, h, 24) for wPixel in range(w): for hPixel in range(h): bmp.SetPixel(wPixel, hPixel, r, g, b) return bmp class MyUserArea(c4d.gui.GeUserArea): def __init__(self): self.boxX = 50 self.boxY = 50 self.boxWidth = 50 self.boxHeight = 50 self.boxAngle = 0 self.boxOpacity = 1.0 self.bgCache = None self.boxCache = None def UpdateBackgroundCache(self,x2,y2): self.bgCache = drawColorBitmap(x2,y2,0.35,0.35,0.35) def UpdateBoxCache(self): rMap = c4d.bitmaps.GeClipMap() rMap.Init(self.boxWidth, self.boxHeight) rMap.BeginDraw() rMap.SetDrawMode(c4d.GE_CM_DRAWMODE_BLEND, c4d.GE_CM_SRC_MAX_OPACITY) rMap.SetColor(255,0,0,255) rMap.FillRect(0,0,50,self.boxHeight) rMap.EndDraw() # The bitmap returned by GeClipMap.GetBitmap() is owned by the # GeClipMap. Leaving the scope of this function will free the # GeClipMap and with it the attached BaseBitmap. bitmap = rMap.GetBitmap() # Either clone the bitmap or also reference the GeClipMap so that # it won't be deallocated on exit. self.boxCache = bitmap.GetClone() def GetMinSize(self): return 300,150 def UpdateCache(self): #Cache Background if self.bgCache == None: self.UpdateBackgroundCache(self.GetWidth(),self.GetHeight()) #Cache Red Box if self.boxCache == None: self.UpdateBoxCache() #Blit Red Box with Background clipMap = bitmaps.GeClipMap() clipMap.InitWithBitmap(self.bgCache, None) clipMap.BeginDraw() clipMap.SetDrawMode(c4d.GE_CM_DRAWMODE_BLEND, c4d.GE_CM_SRC_MAX_OPACITY) rectMap = bitmaps.GeClipMap() rectMap.InitWithBitmap(self.boxCache, None) clipMap.Blit(self.boxX, self.boxY, rectMap, 0, 0, self.boxWidth, self.boxHeight, rop = c4d.GE_CM_BLIT_COL) clipMap.EndDraw() # The same thing applies here. bmp = clipMap.GetBitmap() return bmp.GetClone() def DrawMsg(self, x1, y1, x2, y2, msg): cache = self.UpdateCache() self.DrawBitmap(cache, x1, y1, x2, y2, 0, 0, 300, 150, c4d.BMP_NORMAL | c4d.BMP_ALLOWALPHA) class ExampleDialog(c4d.gui.GeDialog): geUserArea = MyUserArea() def CreateLayout(self): self.SetTitle("ClipMap") self.AddUserArea(GADGET_ID_GEUSERAREA, c4d.BFH_CENTER | c4d.BFH_SCALE | c4d.BFV_CENTER | c4d.BFV_SCALE, 300, 150) self.AttachUserArea(self.geUserArea, GADGET_ID_GEUSERAREA) return True def main(): global dlg dlg = ExampleDialog() dlg.Open(c4d.DLG_TYPE_ASYNC, defaultw=400, defaulth=250, xpos=-2, ypos=-2) if __name__=='__main__': main()
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@zipit Thank you very much, Ferdinand. This helped me a lot!