BlitImageAlphaAddImage

BlitImageAlphaAddImage ThisImage, Xpos, Ypos, BlendImage

Parameters:     ThisImage = The Index of the image you wish to draw     Xpos = The X coordinate to draw this image     Ypos = The Y coordinate to draw this image     BlendImage = The index of the image to you wish to blend with the primary image

Returns: NONE

BlitImageAlphaAddImage is similar to the DrawImage function, except it has post processing. What it does, is it takes two images (of the same size) and uses Alpha Addition to blend them together before drawing them. Each output pixel is created by adding the a blend image pixels with the primary images pixels. Neither image is modified during the process.       To create equivalent functionally, you'd need three images. The two images you wish to draw blended and third to store the temporary blended state. So we'd first copy the src image #1 to image #3, then blend src image #2 onto image #3 and finally draw image 3 to it's destination.       The combined processing is not just to save you a few lines of code, it's actually a more optimal way of performing this action. FACTS:      * BlitImageAlphaAddImage is only intend for drawing FX or AFX formatted image surfaces.      * BlitImageAlphaAddImage doesn't support mask & alpha channel transparency.

Example Source: Download This Example ; Inlude the Blit Image functions   #Include "BlitImage"    ; Create an FX image the size of the screen   MyImage=NewFXImage(GetScreenWidth(),GetScreenHeight())       ; Create a second  FX image the size of the screen ; we'll be using to blend with our other image   Backdrop=NewFXImage(GetScreenWidth(),GetScreenHeight())    ; fill the backdrop with something so we can see it   Tile=LoadNewFxImage("..\../Media/bg22.jpg")   RenderToImage Backdrop   TileImage Tile,0,0,false       ; Set Fps of the program   SetFPS 30    ; enable Vsync to remove any tearing from the refresh   ScreenVsync on    ; Start of Demo loop   Do          ; redirect all drawing to this image      RenderToImage MyImage                  Col=$803030      If MouseButton()<>0 Then Col=RndRGB()          ; draw a circle at the mouses current position      CircleC MouseX(),MouseY(),100, true,Col          ; redirect all drawing to screen back buffer      RenderToScreen          ; To do combined Blit (copy) our Image, with combined CLS of image.    ; to the PB screen      BlitImageAlphaAddImage(MyImage,0,0,BackDrop)                ; Display Message      Text 0,0,"USing BlitImageAlphaAddImage to create a blur effect"          ; flip the back buffer to the front, so the user can see it      Sync         Loop

Related Info:	BlitImageAlpha50Colour | BlitImageAlphaMultImage | BlitImageAlphaSubImage | BlitImageClear | Box | DrawAlphaImage | DrawImage | InkMode :

(c) Copyright 2002 - 2024 - Kevin Picone - PlayBASIC.com