Appendix D. Common graphics platform differences

Parts of the Common Graphics subsystem can behave differently depending on constraints of the platform (hardware, operating system, and window system). For example, Windows provides only four dashed-line styles and does not support user-defined dash styles. Where possible, Common Graphics features are mapped to the closest available features on the platform.

The tables below identify the platform constraints of the Common Graphics subsystem. Blank cells indicate that the corresponding item is fully supported for the indicated platform

Table 116. Constraints on cursors (CgCursor)

Item	Windows	OS/2 PM	X/MOTIF
Color cursors	Not supported	Not supported

 

Table 117. Constraints on device independent images (CgDeviceIndependentImage)

Item	Windows	OS/2 PM	X/MOTIF
Display of 1-bit images
Display of 4-bit images
Display of 8-bit images
Display of 16-bit images	Not supported	Not supported	Not supported
Display of 24-bit images			Not supported
Display of 32-bit images	Not supported	Not supported	Not supported

 

Table 118. Constraints on graphics context attributes (CgGC)

Item	Windows	OS/2 PM	X/MOTIF
arcMode
background
capStyle	CapRound only
clipMask
dashes	Closest match done to 4 predefined dash lists: #(4 4), #(24 8), #(12 8 4 8), #(12 4 4 4 4 4)	Closest match done to 7 predefined dash lists: #(1 1), #(4 4), #(8 8), #(12 8 4 8), #(12 8), #(4 4 4 20), #(12 4 4 4 4 4)
fillRule
fillStyle	Tiles/stipples not supported by thick lines. FillStippled draws the same as FillOpaqueStippled for filled arcs.
font
foreground
function
joinStyle	JoinRound only
lineStyle	Dashes not supported by thick lines. Lines can have either dashes or stipple/tile pattern, but not both. Fill style has priority. Color not supported by LineOnOffDash.	Dashes not supported by thick lines. Lines can have either dashes or stipple/tile pattern, but not both. Fill style has priority. LineDoubleDash not supported.
lineWidth
stipple	No limit for filled rectangles. 8x8 only for other graphics primitives.	Foreground and background colors unsupported for stipples larger that 8x8.
subwindowMode
tile	No limit for filled rectangles. 8x8 only for other graphics primitives.

 

Table 119. Constraints on icons (CgIcon)

Item	Windows	OS/2 PM	X/MOTIF
Icon size limit	32x32	32x32 (VGA) and 40x40 (8514/A, XGA)	40x40 (8514/A, XGA)

 

Table 120. Constraints on indexed palettes (CgIndexedPalette)

Item	Windows	OS/2 PM	X/MOTIF
Animating entries	Only 256-color devices	Not supported	Not supported