Just a few questions:

What version of QNX are your using?
What graphics (devg-xxxxx) driver are you using?  What target CPU?
Can this be reproduced in a small recompileable test case?  If so,
please attach it.

-----Original Message-----
From: Thomas Wihl [mailto:community-noreply@qnx.com] 
Sent: Tuesday, June 02, 2009 10:26 AM
To: advanced-graphics
Subject: SEGV in gf_draw_blit2

I am creating a lot of offscreen surfaces and bit blitting some graphics
from memory to that surface. After a defined number of surfaces the
application crashes with with SIGSEGV in memcpy inside gf_draw_blit2.

Here is the code snippet:
...
	gf_surface_t dstSurface;
	gf_draw_end(hal->context);
	if (gf_surface_create(&dstSurface, hal->device, dst.w, dst.h,
GF_FORMAT_PACK_ARGB1555, 0, GF_SURFACE_CREATE_2D_ACCESSIBLE) ==
GF_ERR_OK)
	{
		gf_surface_t imgSurface;
		if (gf_surface_attach(&imgSurface, hal->device, dst.w,
dst.h, dst.access.direct.stride, GF_FORMAT_PKLE_ARGB1555, 0,
dst.access.direct.data, 0) == GF_ERR_OK)
		{
			gf_draw_begin(hal->context);
			std::cout << "Blit begin " << hal->context <<
std::endl;
			gf_surface_info_t info;
			gf_surface_get_info(dstSurface, &info);
			std::cout << "sid = " << info.sid << ", w = " <<
info.w << ", h = " << info.h << ", format = " << info.format << ",
stride = " << info.stride;
			std::cout << ", paddr = " << (unsigned
int*)info.paddr << ", vaddr = " << (unsigned int*)info.vaddr << ", flags
= " << info.flags << std::endl;

			gf_draw_blit2(hal->context, imgSurface,
dstSurface, 0, 0, dst.w - 1, dst.h - 1, 0, 0);
			std::cout << "Blit end " << hal->context <<
std::endl;
			gf_draw_end(hal->context);
			gf_surface_free(imgSurface);
		}
		else
		{
	        std::cerr << "Failed to create memory surface" <<
std::endl;
		}
	}
	else
	{
        std::cerr << "Failed to create offscreen surface" << std::endl;
	}

	std::free(dst.access.direct.data);
...

And the application output:
...
Image data = 36a018
Blit begin 12a778
sid = 146, w = 28, h = 1301, format = 5392, stride = 64, paddr =
43ea5ec0, vaddr = 85fa5ec0, flags = 164095
Blit end 12a778
Image data = 36a018
Blit begin 12a778
sid = 145, w = 31, h = 1451, format = 5392, stride = 64, paddr =
43e8f3c0, vaddr = 85f8f3c0, flags = 164095
Blit end 12a778
Image data = 3b0018
Blit begin 12a778
sid = 144, w = 33, h = 1523, format = 5392, stride = 128, paddr =
43e5fa00, vaddr = 85f5fa00, flags = 164095

Process 266260 (FontAppwt124395008950214) terminated SIGSEGV code=1
fltno=11 ip=0105a1cc(libc.so.3@memcpy+0x64) mapaddr=0005a1cc.
ref=003c9000

Is the source code available, so I can debug libffb?

Thanks,
Thomas


_______________________________________________
Advanced Graphics
http://community.qnx.com/sf/go/post30536