參數(shù)資料
型號(hào): TVP3020-175
廠商: Texas Instruments, Inc.
英文描述: Video Interface PALETTE(視頻接口調(diào)色器)
中文描述: 視頻接口盒(視頻接口調(diào)色器)
文件頁數(shù): 40/98頁
文件大小: 582K
代理商: TVP3020-175
2–26
The crosshair cursor and the auxiliary window function utilize the same set of window registers. Therefore,
care must be taken if the crosshair cursor is to be displayed when the auxiliary window function is enabled
(ACR0 = 1). See Section 2.6.
2.5.5
Both the user-definable 64
×
64 cursor and the crosshair cursor may be enabled for display simultaneously,
allowing the generation of custom crosshair cursors. As previously mentioned, the sprite-origin (x,y) register
specifies the 64
×
64 cursor pattern location relative to the cursor position and crosshair cursor.
Dual-Cursor Positioning
Figure 2–8 illustrates displaying the dual cursors, showing the relationship between the auxiliary window,
the crosshair cursor, and the 64
×
64 cursor for the case where the sprite-origin (x,y) register is set to
(31, 31).
Window Start (X, Y)
Cursor Position (X, Y)
Crosshair Cursor
64 X 64 Cursor Area
Window Stop (x, y)
Crosshair Window
Figure 2–8. Dual-Cursor Positioning
Figure 2–9 shows one possible custom cursor that could be created by setting the sprite-origin register to
(0,0) and drawing an arrow in 64
×
64 cursor RAM. The cursor window has been set to full screen by setting
the window-start (x,y) register to 0000 (hex) and the window-stop registers to the last active pixel location.
The 64
×
64 cursor area could be located in different locations about the cursor position by programming
the sprite-origin (x,y) registers to different values as described earlier (see Section 2.5.3).
Cursor Position (x, y)
Crosshair Cursor
64
×
64 Cursor Area
Sprite Origin = (0, 0)
Crosshair Window = Full Screen
Figure 2–9. One Possible Custom Cursor Creation
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