RGBSurface Class
Used for direct-color pixel manipulations. The RGBSurface property of a Picture object allows you to manipulate the picture at the pixel level.
Can be used only for pictures created by NewPicture with a pixel depth of 16 or 32.
Pixel manipulations using the RGBSurface property are faster than the same manipulations using the Graphics class methods.
Example
This example replaces all the black pixels in a Picture, somePicture, with white:
Dim x, y As Integer
surf = somePicture.RGBSurface
For y = somePicture.height - 1 downTo 0
For x = somePicture.width - 1 downTo 0
If surf.Pixel(x,y) = &c000000 then surf.Pixel(x,y) =&cFFFFFF
next
next
The following example uses the FloodFill method to paint an RGBSurface object in a random color. It is in the MouseDown event of a Canvas control. The variable p is a Picture object.
randomColor= RGB( Rnd*255, Rnd*255, Rnd*255) //create random color
p.RGBSurface.FloodFill x,y,randomColor //fill the area with the color
Me.Graphics.DrawPicture p,0,0 //repaint the canvas control
The following example uses the Transform method to invert an image:
For i = 0 to 255
map(i) = 255 - i
next
somePicture.RGBSurface.Transform map
Note
32-bit RGBSurface objects are mapped to 24-bit objects on Windows.
See Also
RGBSurface property of the Picture object.