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參數(shù)資料
| 型號： | TP6508 |
| 英文描述： | Pushbutton Switch; Actuator Diameter:0.078"; Circuitry:6PDT; Switch Operation:6 Changeover Push-Push; Contact Current Max:100mA; Leaded Process Compatible:Yes; Mounting Type:PCB; Switch Function:6PDT |
| 中文描述： | 顯卡 |
| 文件頁數(shù)： | 33/134頁 |
| 文件大?。?/td> | 600K |
| 代理商： | TP6508 |
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P.30
,Destination data ,and Pattern data to perform writing the result back to the destination area under the
control of parameters programmed into the chip. The Destination data and Pattern data must reside in
the display memory. The Source data and Color expansion pixel data may reside in display memory or
be supplied by the CPU during a graphics accelerated operation.
Optionally, we support the base addressing and the memory map I/O addressing to access those
GEC. registers with 16-bit/32-bit data width. It is more convenient to implement the GUI acceleration
function in order to improve the software level performance.
All of the accelerated functions are integrated by TP6508 for 8-bit , 16-bit , 24-bit color modes.
The encoding of these 256 ROPs is 100% compatible with Microsoft Windows driver interface speci-
fication. See Appendix C for a list of Raster Operation.
* Line Drawing
The Graphic Engine implement line drawing function based on the Bresenham's Algo-
rithm . It can draw solid line or dash line by programming the line drawing pattern registers .
In the case of drawing dash line , there is one selection to determine whether to keep back-
ground data unchanged (transparence) or using the color in "Background Color Registers" as
the background color .
The pattern format are one pixel mapped to one bit and the first pixel mapped the MSb
of the join 32-bits pattern in registers . For the line drawing pattern , one selection is useful
for actual screen display that is only used the lower 8-bits of line drawing pattern and one bit
mapped four or three pixels . When we draw a more vertical line , the GEC can produce three
pixels per mapped bit . When we draw a more horizontal line , the GEC can produce four
pixels per mapped bit .
Another selection is to determine whether is to draw the last pixel of this drawing line
or not .
* Bit Block Transfer
Bit block transfer can copy a rectangular image from a source region to a destination
region on display memory with raster operation in 256 ROPs code described in appendix C.
* Color Expansion
Color expansion function can expand monochrome image which one bit represent one
pixel to two-color image . All the "1" bits in monochrome image expand to the color in
Foreground Color Registers . All the "0" bits expand to the color in Background Color Regis-
ters or keep the background data unchanged if 'Background transparency enable' bit is en-
abled .
A useful case of color expansion is filling text in graphic mode . The monochrome data
are the character font bitmap data and transfer to TP6508 by writing to "Host to Display Data
Transfer Register" .
Some additional notes for 'Color Expansion' need to care is described detail in that
description of 'Image Write'.
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