Error in create DrawTarget with Skia on OS X (signal: 11)

[tioover]

extern crate azure;
extern crate euclid;


use azure::azure_hl::DrawTarget;
use azure::azure_hl::BackendType;
use azure::azure_hl::SurfaceFormat;
use euclid::Size2D;


fn main() {
    let target = DrawTarget::new(BackendType::Skia, Size2D::new(100, 100), SurfaceFormat::R8G8B8A8);

    println!("can't print");
}

     Running `target/debug/test`
Process didn't exit successfully: `target/debug/test` (signal: 11)

[jdm]

@tioover Thank you for reporting this! If you run lldb target/debug/test and get a backtrace from the crash, could you paste it here?

[tioover]

@jdm

RUST_BACKTRACE=1 target/debug/test
[1]    90624 segmentation fault  RUST_BACKTRACE=1 target/debug/test

(lldb) run
Process 90640 launched: '/Users/tioover/Project/test/target/debug/test' (x86_64)
Process 90640 stopped
* thread #1: tid = 0xd614f0, 0x00000001000031b8 test`AzCreateDrawTarget + 40, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8)
    frame #0: 0x00000001000031b8 test`AzCreateDrawTarget + 40
test`AzCreateDrawTarget:
->  0x1000031b8 <+40>: movq   0x8(%rbx), %rax
    0x1000031bc <+44>: leaq   0x1(%rax), %rcx
    0x1000031c0 <+48>: movq   %rcx, 0x8(%rbx)
    0x1000031c4 <+52>: testq  %rbx, %rbx
(lldb) bt
* thread #1: tid = 0xd614f0, 0x00000001000031b8 test`AzCreateDrawTarget + 40, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8)
  * frame #0: 0x00000001000031b8 test`AzCreateDrawTarget + 40
    frame #1: 0x00000001000030ad test`azure::azure_hl::DrawTarget::new(backend=Skia, size=(width = 100, height = 100), format=R8G8B8A8) + 189 at azure_hl.rs:451
    frame #2: 0x000000010000175b test`test::main + 155 at main.rs:10
    frame #3: 0x00000001001a0423 test`sys_common::unwind::try::try_fn::h5537656665160807786 + 35
    frame #4: 0x000000010019ee49 test`__rust_try + 9
    frame #5: 0x00000001001a02c6 test`rt::lang_start::h7030a3d2148a5eb0f4x + 566
    frame #6: 0x0000000100002cfa test`main + 42
    frame #7: 0x00007fff908435ad libdyld.dylib`start + 1

Use SurfaceFormat::B8R8G8A8 can correct running.

[tioover]

BTW: How to read data in SourceSurface? I not found relate method or function.

[jdm]

For the SourceSurface question, I think you're looking for get_data_surface then with_data.

[jdm]

And huh, that's weird that changing the surface format avoids a segfault :<

[jdm]

Oh, I bet CreateDrawTarget returns NULL, so the subsequent AddRef segfaults. AzCreateDrawTargetForData avoids that by checking for null; we should make the same change here.