Improved documentation of channel masks and composite operations.
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@ -73,32 +73,34 @@ typedef int64_t guac_timestamp_t;
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typedef enum guac_composite_mode_t {
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/*
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* (NOTE - set notation encoded in UTF-8):
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*
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* A: Source where destination transparent = S ∩ D′
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* B: Source where destination opaque = S ∩ D
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* C: Destination where source transparent = D ∩ S′
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* D: Destination where source opaque = D ∩ S
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* A: Source where destination transparent = S n D'
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* B: Source where destination opaque = S n D
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* C: Destination where source transparent = D n S'
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* D: Destination where source opaque = D n S
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*
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* 0 = Active, 1 = Inactive
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*/
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/* ABCD */
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/* NOT IMPL'D: 0000 */
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GUAC_COMP_ROUT = 0x2, /* 0010 - Clears destination where source opaque */
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GUAC_COMP_DEST = 0x3, /* 0011 - No operation */
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GUAC_COMP_ATOP = 0x6, /* 0110 - Fill where destination opaque only */
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GUAC_COMP_XOR = 0xA, /* 1010 - XOR */
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GUAC_COMP_ROVER = 0xB, /* 1011 - Fill where destination transparent only */
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GUAC_COMP_OVER = 0xE, /* 1110 - Draw normally */
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GUAC_COMP_PLUS = 0xF, /* 1111 - Add */
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/* Unimplemented in client: */
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/* NOT IMPL'D: 0000 - Clear */
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/* NOT IMPL'D: 0101 - Additive IN */
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/* NOT IMPL'D: 0111 - Additive ATOP */
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/* NOT IMPL'D: 1101 - Additive RATOP */
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/* Buggy in webkit browsers, as they keep channel C on in all cases: */
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GUAC_COMP_RIN = 0x1, /* 0001 */
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GUAC_COMP_ROUT = 0x2, /* 0010 */
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GUAC_COMP_DEST = 0x3, /* 0011 */
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GUAC_COMP_IN = 0x4, /* 0100 */
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/* NOT IMPL'D: 0101 */
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GUAC_COMP_ATOP = 0x6, /* 0110 */
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/* NOT IMPL'D: 0111 */
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GUAC_COMP_OUT = 0x8, /* 1000 */
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GUAC_COMP_RATOP = 0x9, /* 1001 */
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GUAC_COMP_XOR = 0xA, /* 1010 */
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GUAC_COMP_ROVER = 0xB, /* 1011 */
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GUAC_COMP_SRC = 0xC, /* 1100 */
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/* NOT IMPL'D: 1101 */
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GUAC_COMP_OVER = 0xE, /* 1110 */
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GUAC_COMP_PLUS = 0xF /* 1111 */
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GUAC_COMP_SRC = 0xC /* 1100 */
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} guac_composite_mode_t;
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