TCompositeOperation

Unit: WebUI

TCompositeOperation = (coSourceOver,coSourceOnTop,coSourceIn,
      coSourceOut, coDestOnTop,coDestIn,coDestOut,coDestOver,
      coLighter,coXOR,coCopy)

Available In: Client Applications

The TCompositeOperation enumerated type is used to specify the how pixels are combined when drawing occurs with a TCanvasElement instance.

Element

Description

coCopy	Draw the source pixel, ignoring the destination pixel.
coDestIn	Multiply the destination pixel by the opacity of the source pixel, but ignore the color of the source pixel.
coDestOnTop	Draw the source pixel underneath the destination pixel. If the source pixel is transparent, then the resulting pixel will also be transparent.
coDestOut	The destination pixel becomes transparent if the source pixel is opaque, and is not changed if the source pixel is transparent. The color of the source pixel is ignored.
coDestOver	The source pixel will appear behind the destination pixel, and shows based upon the transparency of the destination pixel.
coLighter	The colors of the source and destination pixels are added together and truncated by the maximum color value possible.
coSourceIn	Draw the source pixel, but multiply it by the opacity of the destination pixel. The color of the destination pixel is ignored, but if the destination pixel is transparent, then the resulting pixel will be also be transparent.
coSourceOnTop	Draw the source pixel on top of the destination, but multiply it by the opacity of the desination pixel. If the destination pixel is transparent, then nothing is drawn.
coSourceOut	The resulting pixel is the source pixel when the destination pixel is transparent, and a transparent pixel when the destination pixel is opaque. The color of the destination pixel is ignored.
coSourceOver	The source pixel is drawn on top of the destination pixel. If the source pixel is partially-transparent, then the destination pixel is included to draw the resulting pixel. This is the default type of composite operation for canvas drawing.
coXOR	If the source pixel is transparent, then the resulting pixel is the destination pixel. If the destination pixel is transparent, then the resulting pixel is the source pixel. If both the source and destination pixels are transparent or opaque, then the resulting pixel will be transparent.

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