FT800 Series Programmer Guide
Version 2.1
Document Reference No.: BRT_000030 Clearance No.: BRT#037
245
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5.54 CMD_SNAPSHOT - take a snapshot of the current screen
This command causes the co-processor engine to take a snapshot of the current screen,
and write the result into RAM_G as a ARGB4 bitmap. The size of the bitmap is the size of
the screen, given by the REG_HSIZE and REG_VSIZE registers.
During the snapshot process, the display should be disabled by setting REG_PCLK to 0 to
avoid display glitch.
Because co-processor engine needs to write the result into the destination address, the
destination address must be never used or referenced by graphics engine.
C prototype
void cmd_snapshot( uint32_t ptr );
Parameters
ptr
Snapshot destination address, in RAM_G
Command layout
Examples
To take a snapshot of the current 160 x 120 screen, then use it as a bitmap in the
new display list:
wr(REG_PCLK,0);//Turn off the PCLK
wr16(REG_HSIZE,120);
wr16(REG_WSIZE,160);
cmd_snapshot(0);//Taking snapshot.
wr(REG_PCLK,5);//Turn on the PCLK
wr16(REG_HSIZE,272);
wr16(REG_WSIZE,480);
cmd_dlstart();
cmd(CLEAR(1,1,1));
cmd(BITMAP_SOURCE(0));
cmd(BITMAP_LAYOUT(ARGB4, 2 * 160, 120));
cmd(BITMAP_SIZE(NEAREST, BORDER, BORDER, 160, 120));
cmd(BEGIN(BITMAPS));
cmd(VERTEX2II(10, 10, 0, 0));
Code snippet 18 CMD_SNAPSHOT 160x120–screen
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