#21854 - ProblemBaby - Tue Jun 08, 2004 12:01 am
does it exist hardware support for rectangular copying?
#21859 - sajiimori - Tue Jun 08, 2004 2:24 am
The only hardware copying feature is DMA.
#21860 - tepples - Tue Jun 08, 2004 2:48 am
If you really need hardware-accelerated copying of rectangular sections of bitmaps, then you probably need to design your engine to use mode 0 and/or sprites.
What are you trying to do?
_________________
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#21863 - ProblemBaby - Tue Jun 08, 2004 10:19 am
I use mode 0 I want to copy map data (rects)
to backgrounds
#21864 - ampz - Tue Jun 08, 2004 11:25 am
If I understand you correctly, a for loop with a DMA request in it should do the trick.
Assuming your memcpy implementation use DMA, something like this should work for copying rectangles of data:
| Code: |
for(row=start_row; row<=end_row; row++)
memcpy(target_base+row*row_length+start_column, source_base+row*row_length+start_column, rect_width);
|
start_row == upper row of rectangle.
end_row == lower row of rectangle.
target_base == target map base address.
source_base == source map base address (if there is one).
row_length == total map width in bytes.
start_column == left column of recangle in bytes.
rect_width == rectangle width in bytes.