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Showing content from https://docs.microsoft.com/en-us/typography/opentype/spec/tt_graphics_state below:

Graphics State Summary (OpenType 1.9.1) - Typography

Graphics State Summary

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The following tables summarize the variables that make up the Graphics State. Nearly all of the Graphics State variables have a default value as shown below. That value is reestablished for every glyph in a font. Instructions are available for resetting the value of all Graphics State variables. Some state variables can be reset in the CVT Program. In such cases the value set becomes the new default and will be reestablished for each glyph. When value of a state variable is changed by instructions associated with a particular glyph, it will hold only for that glyph.

The setting of the Graphics State variables will affect the actions of certain instructions. Affected instructions are listed for each variable.

Graphics State Variable Default Set With Affects auto_flip TRUE FLIPOFF
FLIPON MIAP
MIRP control_value_cut_in 17/16 pixels SCVTCI MIAP
MIRP delta_base 9 SDB DELTAP1
DELTAP2
DELTAP3
DELTAC1
DELTAC2
DELTAC3 delta_shift 3 SDS DELTAP1
DELTAP2
DELTAP3
DELTAC1
DELTAC2
DELTAC3 dual_projection_vectors — SDPVTL IP
GC
MD
MDRP
MIRP freedom_vector x-axis SFVTCA
SFVTL
SFTPV
SVTCA
SFVFS GFV zp0 1 SZP0
SZPS AA
ALIGNPTS
ALIGNRP
DELTAP1
DELTAP2
DELTAP3
IP
ISECT
MD
MDAP
MIAP
MIRP
MSIRP
SHC
SHZ
SHP
UTP zp1 1 SZP1
SZPS AA
ALIGNPTS
ALIGNRP
IP
MD
MDRP
MIRP
MSIRP
SHC
SHZ
SHP
SFVTL
SPVTL zp2 1 SZP2
SZPS ISECT
IUP
GC
SHC
SHP
SFVTL
SHPIX
SPVTL
SC instruct_Control 0 INSTCTRL all instructions loop 1 SLOOP ALIGNRP
FLIPPT
IP
SHP
SHPIX minimum_distance 1 pixel LMD MDRP
MIRP projection_vector x-axis SPVTCA
SPVTL
SVTCA
SPVFS GPV round_state 1 RDTG
ROFF
RTDG
RTG
RTHG
RUTG
SROUND
S45ROUND MDAP
MIAP
MDRP
MIRP
ROUND rp0 0 SRP0 IP
MDAP
MIAP
MIRP
MSIRP
SHC
SHZ
SHP rp1 0 SRP1 IP
MDAP
MDRP
MIAP
MSIRP
SHC
SHZ
SHP rp2 0 SRP2 IP
MDRP
MIRP
MSIRP
SHC
SHZ
SHP scan_control FALSE SCANCTRL
SCANTYPE singe_width_cut_in 0 pixels SSWCI MDRP
MIRP single_width_value 0 pixels SSW* MDRP
MIRP

* The SSW argument is expressed in FUnits. The interpreter will convert this to pixels (F26Dot6).

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