| Constants |
| CLEAR |
Clear the destination. |
| SOURCE |
Copy source as-is to the destination. |
| DESTINATION |
Leave the destination as-is. |
| OVER |
Copy the source over the destination. |
| UNDER |
Copy the source under the destination. |
| INSIDE |
Copy the source to the destination. |
| INSIDE_REVERSE |
Leave the destination as is. |
| OUTSIDE |
Copy the source to the destination |
| OUTSIDE_REVERSE |
Leave the destination as is. |
| ATOP |
Copy the source over the destination |
| ATOP_REVERSE |
Copy the destination over the source. |
| XOR |
Combine source and destination by exclusive or. |
| ADD |
Add source and destination values. |
| SATURATE |
Saturate source and destination. |
| Constants' Details |
CLEAR
const byte CLEAR = 0;
- Description
- Clear the destination.
Clear the destination area. The function values are: Fa = Fb =
0.
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SOURCE
const byte SOURCE = 1;
- Description
- Copy source as-is to the destination.
Copy source as-is to the destination. The function values are:
Fa = 1, Fb = 0.
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DESTINATION
const byte DESTINATION = 2;
- Description
- Leave the destination as-is.
Leave the destination as-is. The function values are: Fa = 0,
Fb = 1.
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OVER
const byte OVER = 3;
- Description
- Copy the source over the destination.
Copy the source over the destination. The function values are:
Fa = 1, Fb = 1-Aa.
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UNDER
const byte UNDER = 4;
- Description
- Copy the source under the destination.
Copy the source under the destination. The function values
are: Fa = 1-Ab, Fb = 1.
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INSIDE
const byte INSIDE = 5;
- Description
- Copy the source to the destination.
Copy the source to the destination, but limited to where the
destination is. The function values are: Fa = Ab, Fb = 0.
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INSIDE_REVERSE
const byte INSIDE_REVERSE = 6;
- Description
- Leave the destination as is.
Leave the destination as is, but only where the source
was. The function values are: Fa = 0, Fb = Aa.
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OUTSIDE
const byte OUTSIDE = 7;
- Description
- Copy the source to the destination
Copy the source to the destination, but limited to where the
destination is not. The function values are: Fa = 1-Ab, Fb =
0.
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OUTSIDE_REVERSE
const byte OUTSIDE_REVERSE = 8;
- Description
- Leave the destination as is.
Leave the destination as is, but only where the source has not
been. The function values are: Fa = 0, Fb = 1-Aa.
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ATOP
const byte ATOP = 9;
- Description
- Copy the source over the destination
Copy the source over the destination, but only where the
destination is. Keep the destination. The function values are:
Fa = Ab, Fb = 1-Aa.
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ATOP_REVERSE
const byte ATOP_REVERSE = 10;
- Description
- Copy the destination over the source.
Copy the destination over the source, but only where the
source is. Keep the source. The function values are: Fa =
1-Ab, Fb = Aa.
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XOR
const byte XOR = 11;
- Description
- Combine source and destination by exclusive or.
Take only the parts where either source or destination, but
not both visible. The function values are: Fa = 1-Ab, Fb =
1-Aa.
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ADD
const byte ADD = 12;
- Description
- Add source and destination values.
Simply add contributions of both source and destination. The
resulting color values are limited to the permissible color
range, and clipped to the maximal value, if exceeded. The
function values are: Fa = 1, Fb = 1.
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SATURATE
const byte SATURATE = 13;
- Description
- Saturate source and destination.
Saturate destination with source values. The function values
are: Fa = min(1,(1-Ab)/Aa), Fb = 1
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