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platform_system_core
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Fix several issues in framebuffer_service 

-supports fb's with x and y offsets
-dumps the front buffer (instead of just the low end of the buffer)
-switch from mmap to read/write, for fb's with very large offsets

Change-Id: Id560790c9661f7cc3b4350a44cc29f0104831e85
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
This commit is contained in:
Rebecca Schultz Zavin 2009-09-09 21:39:41 -07:00
parent e991decf34
commit 04bee29ad9
1 changed files with 23 additions and 14 deletions
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37
adb/framebuffer_service.c
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@ -28,18 +28,17 @@
#include <sys/mman.h>
/* TODO:
** - grab the current buffer, not the first buffer
** - sync with vsync to avoid tearing
*/
void framebuffer_service(int fd, void *cookie)
{
struct fb_var_screeninfo vinfo;
int fb;
void *ptr = MAP_FAILED;
char x;
int fb, offset;
char x[256];
unsigned fbinfo[4];
unsigned i, bytespp;
fb = open("/dev/graphics/fb0", O_RDONLY);
if(fb < 0) goto done;
@ -47,24 +46,34 @@ void framebuffer_service(int fd, void *cookie)
if(ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) < 0) goto done;
fcntl(fb, F_SETFD, FD_CLOEXEC);
fbinfo[0] = 16;
fbinfo[1] = vinfo.xres * vinfo.yres * 2;
bytespp = vinfo.bits_per_pixel / 8;
fbinfo[0] = vinfo.bits_per_pixel;
fbinfo[1] = vinfo.xres * vinfo.yres * bytespp;
fbinfo[2] = vinfo.xres;
fbinfo[3] = vinfo.yres;
ptr = mmap(0, fbinfo[1], PROT_READ, MAP_SHARED, fb, 0);
if(ptr == MAP_FAILED) goto done;
/* HACK: for several of our 3d cores a specific alignment
* is required so the start of the fb may not be an integer number of lines
* from the base. As a result we are storing the additional offset in
* xoffset. This is not the correct usage for xoffset, it should be added
* to each line, not just once at the beginning */
offset = vinfo.xoffset * bytespp;
if(writex(fd, fbinfo, sizeof(unsigned) * 4)) goto done;
offset += vinfo.xres * vinfo.yoffset * bytespp;
for(;;) {
if(readx(fd, &x, 1)) goto done;
if(writex(fd, ptr, fbinfo[1])) goto done;
if(writex(fd, fbinfo, sizeof(fbinfo))) goto done;
lseek(fb, offset, SEEK_SET);
for(i = 0; i < fbinfo[1]; i += 256) {
if(readx(fb, &x, 256)) goto done;
if(writex(fd, &x, 256)) goto done;
}
if(readx(fb, &x, fbinfo[1] % 256)) goto done;
if(writex(fd, &x, fbinfo[1] % 256)) goto done;
done:
if(ptr != MAP_FAILED) munmap(ptr, fbinfo[1]);
if(fb >= 0) close(fb);
close(fd);
}