[Webkit-unassigned] [Bug 155536] New: Wrong use of EGL_DEPTH_SIZE

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155536

            Bug ID: 155536
           Summary: Wrong use of EGL_DEPTH_SIZE
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: erwin at erwinrol.com

In Source/WebCore/platform/graphics/egl/GLContextEGL.cpp function std::unique_ptr<GLContextEGL> GLContextEGL::createPixmapContext(EGLContext sharingContext) uses;

eglGetConfigAttrib(display, config, EGL_DEPTH_SIZE, &depth)

to (mistakenly) get the depth buffer size instead of the color depth. That depth (0 because no depth buffer was requested) is later passed to;

XCreatePixmap(x11Display, DefaultRootWindow(x11Display), 1, 1, depth) 

to request a pixmap with the same color depth as the screen. And passing 0 causes that call to fail with a;

(WebKitWebProcess:669): Gdk-ERROR **: The program 'WebKitWebProcess' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadValue'.
  (Details: serial 148 error_code 2 request_code 53 (core protocol) minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)


On my hardware setup (Tegra3 Linux) setting depth hard to 32 makes things work, this is ofcourse not a real fix because other setups might not use 32bit screens.

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