pixel_drawing_mode

bitwise pixel rendering functions.

Description

Here, the color encoding is RGB. The pixel drawing mode is a figure property that specifies a bitwise operation applied on any figure pixel between the incoming color and the already existing color on the figure. The result of this operation will be the new pixel color. src is the incoming color of the pixel. prv is the previus color of the pixel (which is already drawn). res is the resulting color of the pixel (which will be drawn). Possible values for pixel_drawing_mode are:

value	bitwise operation	comments
0	CLEAR	Result color is black
1	AND	res = src AND prv
2	AND REVERSE	res = src AND (NOT prv)
3	COPY	res = src, default value
4	AND INVERTED	res = (NOT src) AND prv
5	NOOP	res = prv
6	XOR	res = src XOR prv
7	OR	res = src OR prv
8	NOR	res = NOT (src OR prv)
9	EQUIV	res = (NOT src) XOR prv
10	INVERT	res = NOT prv
11	OR REVERSE	res = src OR (NOT prv)
12	COPY INVERTED	res = NOT src
13	OR INVERTED	res = (NOT src) OR prv
14	NAND	res = NOT (src AND prv)
15	SET	Result color is white

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Last updated:
Wed Jan 26 16:24:42 CET 2011