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Fix ioctl() warning, try full-width copy, 30 fps max

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This commit is contained in:
Phillip Burgess 2017-11-09 22:49:37 -08:00
parent 2d885fc8b2
commit 9c4b801637
1 changed files with 11 additions and 1 deletions
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12
main.c
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@ -4,6 +4,7 @@
#include <fcntl.h> #include <fcntl.h>
#include <linux/fb.h> #include <linux/fb.h>
#include <sys/mman.h> #include <sys/mman.h>
#include <sys/ioctl.h>
#include <bcm_host.h> #include <bcm_host.h>
@ -108,6 +109,14 @@ int process() {
int lastRow = last / vinfo.xres; int lastRow = last / vinfo.xres;
// printf("%d %d\n", firstRow, lastRow); // printf("%d %d\n", firstRow, lastRow);
#if 0
// Try a full-width copy (single operation)
memcpy(
(uint16_t *)&fbp[(firstRow * vinfo.xres) * 2],
&screenbuf[bufNum][firstRow * vinfo.xres],
vinfo.xres * (lastRow - firstRow + 1) * 2);
#else
// Try rect bounds (multiple memcpy's)
int firstCol = vinfo.xres - 1, lastCol = 0; int firstCol = vinfo.xres - 1, lastCol = 0;
for(int row=firstRow; row <= lastRow; row++) { for(int row=firstRow; row <= lastRow; row++) {
uint16_t *s = &screenbuf[2][row * vinfo.xres]; uint16_t *s = &screenbuf[2][row * vinfo.xres];
@ -130,9 +139,10 @@ int process() {
dst += vinfo.xres; dst += vinfo.xres;
} }
// memcpy(fbp, screenbuf[2], vinfo.xres * vinfo.yres * 2); // memcpy(fbp, screenbuf[2], vinfo.xres * vinfo.yres * 2);
#endif
bufNum = 1 - bufNum; bufNum = 1 - bufNum;
} }
usleep(1000000 / 60); usleep(1000000 / 30);
} }
munmap(fbp, finfo.smem_len); munmap(fbp, finfo.smem_len);