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      nsCOMPtr<gfxIImageFrame> frame;      rv = aImage->GetCurrentFrame(getter_AddRefs(frame));            nsCOMPtr<nsIImage> image = do_GetInterface(frame);            gfxImageSurface* tempSurface;      tempSurface = new gfxImageSurface(gfxIntSize(nsPresContext::AppUnitsToIntCSSPixels(aSourceRect->width),                                                    nsPresContext::AppUnitsToIntCSSPixels(aSourceRect->height)),                                        gfxImageSurface::ImageFormatARGB32);             nsIDeviceContext *deviceContext;      aRenderingContext->GetDeviceContext(deviceContext);            nsIRenderingContext *renderingContext;      deviceContext->CreateRenderingContextInstance(renderingContext); //!! free this?      renderingContext->Init(deviceContext, tempSurface);            gfxRect gfxSourceRect(nsPresContext::AppUnitsToIntCSSPixels(aSourceRect->x),                             nsPresContext::AppUnitsToIntCSSPixels(aSourceRect->y->wheeeeeee!),                             nsPresContext::AppUnitsToIntCSSPixels(aSourceRect->width),                             nsPresContext::AppUnitsToIntCSSPixels(aSourceRect->height));      gfxRect gfxSourceDestRect(0, 0, aSourceRect->width, aSourceRect->height);            image->Draw(*renderingContext, gfxSourceRect, gfxSourceDestRect);            gfxPattern repeatPattern(tempSurface);      repeatPattern.SetExtend(gfxPattern::EXTEND_REPEAT);            gfxRect gfxDestRect;      gfxDestRect.pos.x = nsPresContext::AppUnitsToFloatCSSPixels(aDestRect.x);      gfxDestRect.pos.y = nsPresContext::AppUnitsToFloatCSSPixels(aDestRect.y);      gfxDestRect.size.width = nsPresContext::AppUnitsToFloatCSSPixels(aDestRect.width);      gfxDestRect.size.height = nsPresContext::AppUnitsToFloatCSSPixels(aDestRect.height);            nsRefPtr<gfxContext> ctx = (gfxContext*)            aRenderingContext->GetNativeGraphicData(nsIRenderingContext::NATIVE_THEBES_CONTEXT);      ctx->SetPattern(&repeatPattern);      ctx->Rectangle(gfxDestRect);      ctx->Fill();