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Improved documentation of channel masks and composite operations.

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This commit is contained in:
Michael Jumper 2011-08-29 22:24:45 -07:00
parent eea2e03545
commit e5cc6eb7ca
1 changed files with 20 additions and 18 deletions
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38
libguac/include/protocol.h
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@ -73,32 +73,34 @@ typedef int64_t guac_timestamp_t;
typedef enum guac_composite_mode_t {
/*
* (NOTE - set notation encoded in UTF-8):
*
* A: Source where destination transparent = S ∩ D′
* B: Source where destination opaque = S ∩ D
* C: Destination where source transparent = D ∩ S′
* D: Destination where source opaque = D ∩ S
* A: Source where destination transparent = S n D'
* B: Source where destination opaque = S n D
* C: Destination where source transparent = D n S'
* D: Destination where source opaque = D n S
*
* 0 = Active, 1 = Inactive
*/
/* ABCD */
/* NOT IMPL'D: 0000 */
GUAC_COMP_ROUT = 0x2, /* 0010 - Clears destination where source opaque */
GUAC_COMP_DEST = 0x3, /* 0011 - No operation */
GUAC_COMP_ATOP = 0x6, /* 0110 - Fill where destination opaque only */
GUAC_COMP_XOR = 0xA, /* 1010 - XOR */
GUAC_COMP_ROVER = 0xB, /* 1011 - Fill where destination transparent only */
GUAC_COMP_OVER = 0xE, /* 1110 - Draw normally */
GUAC_COMP_PLUS = 0xF, /* 1111 - Add */
/* Unimplemented in client: */
/* NOT IMPL'D: 0000 - Clear */
/* NOT IMPL'D: 0101 - Additive IN */
/* NOT IMPL'D: 0111 - Additive ATOP */
/* NOT IMPL'D: 1101 - Additive RATOP */
/* Buggy in webkit browsers, as they keep channel C on in all cases: */
GUAC_COMP_RIN = 0x1, /* 0001 */
GUAC_COMP_ROUT = 0x2, /* 0010 */
GUAC_COMP_DEST = 0x3, /* 0011 */
GUAC_COMP_IN = 0x4, /* 0100 */
/* NOT IMPL'D: 0101 */
GUAC_COMP_ATOP = 0x6, /* 0110 */
/* NOT IMPL'D: 0111 */
GUAC_COMP_OUT = 0x8, /* 1000 */
GUAC_COMP_RATOP = 0x9, /* 1001 */
GUAC_COMP_XOR = 0xA, /* 1010 */
GUAC_COMP_ROVER = 0xB, /* 1011 */
GUAC_COMP_SRC = 0xC, /* 1100 */
/* NOT IMPL'D: 1101 */
GUAC_COMP_OVER = 0xE, /* 1110 */
GUAC_COMP_PLUS = 0xF /* 1111 */
GUAC_COMP_SRC = 0xC /* 1100 */
} guac_composite_mode_t;