User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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15.4.5.3. SHEIGHT—Source Height Register
Memory Address Offset: 3Ch (R/W)
On-chip Reg. Mem Addr Offset: 3013Ch (RO; debug path)
Default Value: 00h
Access: see address offset above
Size: 32 bits
31 26 25 16 15 11 10 0
Reserved UV Source Height Reserved Y/RGB Source Height
Bit Description
31:26 Reserved.
25:16 UV Source Height. In packed formats this is unused. For planar YUV formats it indicates the number
of lines starting at and including the base address line contained in the UV source data. When the last
line is reached and the complete destination window has not been filled, this line will be repeated until
the end of the destination window.
• A height must not be specified for lines that are not on the active display.
• Minimum height is 2 lines or 4 lines for interlaced surfaces (Bob).
15:12 Reserved.
10:0 Y/RGB Source Height. In packed formats this indicates the number of lines starting at and including
the base address line contained in the source data. In planar formats, it is the number of Y lines. This
is used to determine where the end of the source is in the vertical direction to handle the edge effects
related to the vertical filter. When the last line is reached and the complete destination window has not
been filled, this line will be repeated until the end of the destination window.
• A height must not be specified for lines that are not on the active display.
• Minimum height is 2 lines or 4 lines for interlaced surfaces (Bob).