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2.2.2.2.1.1.2.13 GlyphIndex (GLYPHINDEX_ORDER)

  • Article

The GlyphIndex Primary Drawing Order encodes a set of glyph indices at a specified position.

 Encoding order number: 27 (0x1B)
 Negotiation order number: 27 (0x1B)
 Number of fields: 22
 Number of field encoding bytes: 3
 Maximum encoded field length: 297 bytes
           


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cacheId (optional)

flAccel (optional)

ulCharInc (optional)

fOpRedundant (optional)

BackColor (optional)

ForeColor (optional)

...

BkLeft (optional)

BkTop (optional)

BkRight (optional)

BkBottom (optional)

OpLeft (optional)

OpTop (optional)

OpRight (optional)

OpBottom (optional)

BrushOrgX (optional)

BrushOrgY (optional)

BrushStyle (optional)

BrushHatch (optional)

BrushExtra (optional)

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X (optional)

Y (optional)

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VariableBytes (variable)

cacheId (1 byte): An 8-bit, unsigned integer. The ID of the glyph cache in which the glyph data MUST be stored. This value MUST be in the range 0 to 9 (inclusive).

flAccel (1 byte): An 8-bit, unsigned integer. Accelerator flags. For glyph related terminology, see [YUAN] figures 14-17 and 15-1. For information about string widths and heights, see [MSDN-SWH]. For information about character widths, see [MSDN-CW]. This field MUST contain a combination of the following flags.

Value

Meaning

SO_FLAG_DEFAULT_PLACEMENT

0x01

This flag MUST be set.

SO_HORIZONTAL

0x02

Text is horizontal, left-to-right or right-to-left, depending on SO_REVERSED.

SO_VERTICAL

0x04

Text is vertical, top-to-bottom or bottom-to-top, depending on SO_REVERSED.

SO_REVERSED

0x08

Set if horizontal text is right-to-left or vertical text is bottom-to-top.

SO_ZERO_BEARINGS

0x10

For a given glyph in the font, the A-width (left-side bearing) and C-width (right-side bearing) associated with the glyph have a value of zero.

SO_CHAR_INC_EQUAL_BM_BASE

0x20

For a given glyph in the font, the B-width associated with the glyph equals the advance width of the glyph.

SO_MAXEXT_EQUAL_BM_SIDE

0x40

The height of the bitmap associated with a given glyph in the font is always equal to the sum of the ascent and descent. This implies that the tops and bottoms of all glyph bitmaps lie on the same line in the direction of writing.

ulCharInc (1 byte): An 8-bit, unsigned integer. Specifies whether or not the font is a fixed-pitch (monospace) font. If so, this member is equal to the advance width of the glyphs in pixels (see [YUAN] figures 14-17); if not, this field is set to 0x00. The minimum value for this field is 0x00 (inclusive), and the maximum value is 0xFF (inclusive).

fOpRedundant (1 byte): An 8-bit, unsigned integer. A Boolean value indicating whether or not the opaque rectangle is redundant. Redundant, in this context, means that the text background is transparent.

Value

Meaning

FALSE

0x00

Rectangle is not redundant.

TRUE

0x01

Rectangle is redundant.

BackColor (3 bytes): The text color described by using a Generic Color (section 2.2.2.2.1.1.1.8) structure.

ForeColor (3 bytes): Color of the opaque rectangle described by using a Generic Color (section 2.2.2.2.1.1.1.8) structure.

BkLeft (2 bytes): A 16-bit, signed integer. The left coordinate of the text background rectangle.

BkTop (2 bytes): A 16-bit, signed integer. The top coordinate of the text background rectangle.

BkRight (2 bytes): A 16-bit, signed integer. The right coordinate of the text background rectangle.

BkBottom (2 bytes): A 16-bit, signed integer. The bottom coordinate of the text background rectangle.

OpLeft (2 bytes): A 16-bit, signed integer. The left coordinate of the opaque rectangle. This field MUST be set to 0 if the fOpRedundant flag is set.

OpTop (2 bytes): A 16-bit, signed integer. The top coordinate of the opaque rectangle. This field MUST be set to 0 if the fOpRedundant flag is set.

OpRight (2 bytes): A 16-bit, signed integer. The right coordinate of the opaque rectangle. This field MUST be set to 0 if the fOpRedundant flag is set.

OpBottom (2 bytes): A 16-bit, signed integer. The bottom coordinate of the opaque rectangle. This field MUST be set to 0 if the fOpRedundant flag is set.

BrushOrgX (1 byte): An 8-bit, signed integer. The x-coordinate of the point where the top leftmost pixel of a brush pattern MUST be anchored.

BrushOrgY (1 byte): An 8-bit, signed integer. The y-coordinate of the point where the top leftmost pixel of a brush pattern MUST be anchored.

BrushStyle (1 byte): An 8-bit, unsigned integer. This field MUST be set to BS_SOLID (0x00), as the GlyphIndex Primary Drawing Order MUST only use solid color brushes to render the opaque rectangle.

BrushHatch (1 byte): An 8-bit, unsigned integer. This field MUST be set to 0x00, as the GlyphIndex Primary Drawing Order MUST only use solid color brushes to render the opaque rectangle.

BrushExtra (7 bytes): This field is not used, as the GlyphIndex Primary Drawing Order MUST only use solid color brushes to render the opaque rectangle.

X (2 bytes): A 16-bit, signed integer. The x-coordinate of the point where the origin of the starting glyph MUST be positioned.

Y (2 bytes): A 16-bit, signed integer. The y-coordinate of the point where the origin of the starting glyph MUST be positioned.

VariableBytes (variable): A One-Byte Header Variable Field (section 2.2.2.2.1.1.1.2) structure. This field MUST contain glyph fragments (which are composed of a series of one or more glyph cache indices) and instructions to use entries previously stored in the glyph fragment cache. Multiple glyph fragments can be contained in this field. The first byte of each fragment is either a USE (0xFE) operation byte or a glyph index (0x00 to 0x0FD) byte:

  • A value of 0xFE (USE) indicates that a previously stored fragment MUST be displayed. The byte following the USE byte is the index in the fragment cache where the fragment is located. This fragment MUST be read and displayed. If the ulCharInc field is set to 0 and the flAccel field does not contain the SO_CHAR_INC_EQUAL_BM_BASE (0x20) flag, then the index byte MUST be followed by a delta byte that indicates the distance between two consecutive fragments; this distance is measured in pixels from the beginning of the first fragment to the beginning of the next. If the distance is greater than 127 (0x7F), then the value 0x80 MUST be used, and the following two bytes will be set to contain the actual distance formatted as an unsigned integer in little-endian order.

  • If not preceded by 0xFE, a value of 0x00 to 0xFD identifies a glyph stored at the given index in the glyph cache. Multiple glyphs can be sent at one time. If the ulCharInc field is set to 0 and the flAccel field does not contain the SO_CHAR_INC_EQUAL_BM_BASE (0x20) flag, then the index byte MUST be followed by a delta byte that indicates the distance between two consecutive glyphs; this distance is measured in pixels from the beginning of the first glyph to the beginning of the next. If the distance is greater than 127 (0x7F), then the value 0x80 MUST be used, and the following two bytes will be set to contain the actual distance formatted as an unsigned integer in little-endian order.

If a series of glyph indices ends with an ADD (0xFF) operation byte, the preceding glyph information MUST be collected, displayed, and then stored in the fragment cache. The byte following the ADD byte is the index of the cache where the fragment MUST be stored. A final byte that indicates the size of the fragment follows the index byte. (The ADD byte, index byte, and size byte MUST NOT be counted when calculating the value of the size byte.)

All glyph cache indices MUST be greater than or equal to 0, and less than the maximum number of entries allowed in the glyph cache with the ID specified by the cacheId field. The maximum number of entries allowed in each of the ten glyph caches is specified in the GlyphCache field of the Glyph Cache Capability Set ([MS-RDPBCGR] section 2.2.7.1.8).

All fragment cache indices MUST be in the range 0 to 255 (inclusive).