Merge 52243c2ff4 into 4df5129529

The glfwCreateWindow function ensures that the width and height are
at least greater or equal than zero, but on X11 it is invalid to
create a window with dimensions that equal zero, see [1].

This change ensures that the dimensions passed to XCreateWindow are
at least 1 by 1.

This issue was detected in [2], where a call to glfwCreateWindow
was done to request a 1x1 window, with a _glfw.x11.contentScaleX of
less than 1.0 (0.958333) this results in a request for a 0x0 window
which then causes an BadWindow error from X11.

[1]: e003f52661/specs/libX11/CH03.xml (L1333-1337)
[2]: https://github.com/WerWolv/ImHex/pull/2390

CONTRIBUTORS.md

@@ -282,10 +282,12 @@ video tutorials.
  - Corentin Wallez
  - Torsten Walluhn
  - Patrick Walton
+ - Ivor Wanders
  - Jim Wang
  - Xo Wang
  - Andre Weissflog
  - Jay Weisskopf
+ - Drew Weymouth
  - Frank Wille
  - Andy Williams
  - Joel Winarske

README.md

@@ -145,10 +145,13 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: The cursor position was not updated when clicking through
    from a modal to the content area
  - [X11] Bugfix: Running without a WM could trigger an assert (#2593,#2601,#2631)
+ - [X11] Bugfix: Occasional crash when an idle display awakes (#2766) 
  - [Null] Added Vulkan 'window' surface creation via `VK_EXT_headless_surface`
  - [Null] Added EGL context creation on Mesa via `EGL_MESA_platform_surfaceless`
  - [EGL] Allowed native access on Wayland with `GLFW_CONTEXT_CREATION_API` set to
    `GLFW_NATIVE_CONTEXT_API` (#2518)
+ - [X11] Bugfix: Prevent BadWindow when creating small windows with a content scale
+   less than 1 (#2754)
 
 
 ## Contact

src/win32_init.c

@@ -126,6 +126,9 @@ static GLFWbool loadLibraries(void)
             {
                 _glfw.win32.xinput.GetCapabilities = (PFN_XInputGetCapabilities)
                     _glfwPlatformGetModuleSymbol(_glfw.win32.xinput.instance, "XInputGetCapabilities");
+                // 108 is the ordinal for _XInputGetCapabilitiesEx, which additionally returns VID/PID of the controller.
+                _glfw.win32.xinput.GetCapabilitiesEx = (PFN_XInputGetCapabilitiesEx)
+                    _glfwPlatformGetModuleSymbol(_glfw.win32.xinput.instance, (LPCSTR)108);
                 _glfw.win32.xinput.GetState = (PFN_XInputGetState)
                     _glfwPlatformGetModuleSymbol(_glfw.win32.xinput.instance, "XInputGetState");
 

src/win32_joystick.c

@@ -519,12 +519,33 @@ void _glfwDetectJoystickConnectionWin32(void)
             if (jid <= GLFW_JOYSTICK_LAST)
                 continue;
 
-            if (XInputGetCapabilities(index, 0, &xic) != ERROR_SUCCESS)
+            if (XInputGetCapabilities(index, XINPUT_FLAG_GAMEPAD, &xic) != ERROR_SUCCESS)
                 continue;
 
-            // Generate a joystick GUID that matches the SDL 2.0.5+ one
-            sprintf(guid, "78696e707574%02x000000000000000000",
-                    xic.SubType & 0xff);
+            GLFW_XINPUT_CAPABILITIES_EX xic_ex;
+            if (!XInputGetCapabilitiesEx || XInputGetCapabilitiesEx(1, index, 0, &xic_ex) != ERROR_SUCCESS)
+            {
+                // use a generic VID/PID representing an XInput controller
+                xic_ex.VendorId = USB_VENDOR_MICROSOFT;
+                xic_ex.ProductId = USB_PRODUCT_XBOX360_XUSB_CONTROLLER;
+                xic_ex.VersionNumber = 0;
+            }
+            else
+            {
+                // fixup for Wireless Xbox 360 Controller
+                if (xic_ex.ProductId == 0 && xic_ex.Capabilities.Flags & XINPUT_CAPS_WIRELESS)
+                {
+                    xic_ex.VendorId = USB_VENDOR_MICROSOFT;
+                    xic_ex.ProductId = USB_PRODUCT_XBOX360_XUSB_CONTROLLER;
+                }
+            }
+
+            // Generate a joystick GUID that matches the SDL one
+            // SDL_xinputjoystick.c:207
+            uint8_t* vid = (uint8_t*)&xic_ex.VendorId;
+            uint8_t* pid = (uint8_t*)&xic_ex.ProductId;
+            uint8_t* ver = (uint8_t*)&xic_ex.VersionNumber;
+            sprintf(guid, "03000000%02x%02x0000%02x%02x0000%02x%02x0000", vid[0], vid[1], pid[0], pid[1], ver[0], ver[1]);
 
             js = _glfwAllocJoystick(getDeviceDescription(&xic), guid, 6, 10, 1);
             if (!js)

src/win32_platform.h

@@ -216,11 +216,26 @@ typedef enum
 #define ERROR_INVALID_PROFILE_ARB 0x2096
 #define ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB 0x2054
 
+// this struct might not defined in XInput headers
+typedef struct
+{
+    XINPUT_CAPABILITIES Capabilities;
+    WORD VendorId;
+    WORD ProductId;
+    WORD VersionNumber;
+    WORD unk1;
+    DWORD unk2;
+} GLFW_XINPUT_CAPABILITIES_EX;
+
 // xinput.dll function pointer typedefs
 typedef DWORD (WINAPI * PFN_XInputGetCapabilities)(DWORD,DWORD,XINPUT_CAPABILITIES*);
+typedef DWORD (WINAPI * PFN_XInputGetCapabilitiesEx)(DWORD,DWORD,DWORD,GLFW_XINPUT_CAPABILITIES_EX*);
 typedef DWORD (WINAPI * PFN_XInputGetState)(DWORD,XINPUT_STATE*);
 #define XInputGetCapabilities _glfw.win32.xinput.GetCapabilities
+#define XInputGetCapabilitiesEx _glfw.win32.xinput.GetCapabilitiesEx
 #define XInputGetState _glfw.win32.xinput.GetState
+#define USB_VENDOR_MICROSOFT                 0x045e
+#define USB_PRODUCT_XBOX360_XUSB_CONTROLLER  0x02a1 // XUSB driver software PID
 
 // dinput8.dll function pointer typedefs
 typedef HRESULT (WINAPI * PFN_DirectInput8Create)(HINSTANCE,DWORD,REFIID,LPVOID*,LPUNKNOWN);
@@ -412,6 +427,7 @@ typedef struct _GLFWlibraryWin32
     struct {
         HINSTANCE                       instance;
         PFN_XInputGetCapabilities       GetCapabilities;
+        PFN_XInputGetCapabilitiesEx     GetCapabilitiesEx;
         PFN_XInputGetState              GetState;
     } xinput;
 

src/x11_monitor.c

@@ -151,6 +151,11 @@ void _glfwPollMonitorsX11(void)
             }
 
             XRRCrtcInfo* ci = XRRGetCrtcInfo(_glfw.x11.display, sr, oi->crtc);
+            if (!ci) {
+                XRRFreeOutputInfo(oi);
+                continue;
+            }
+
             if (ci->rotation == RR_Rotate_90 || ci->rotation == RR_Rotate_270)
             {
                 widthMM  = oi->mm_height;

src/x11_window.c

@@ -576,6 +576,10 @@ static GLFWbool createNativeWindow(_GLFWwindow* window,
         height *= _glfw.x11.contentScaleY;
     }
 
+    // The dimensions must be nonzero, or a BadValue error results.
+    width = _glfw_max(1, width);
+    height = _glfw_max(1, height);
+
     int xpos = 0, ypos = 0;
 
     if (wndconfig->xpos != GLFW_ANY_POSITION && wndconfig->ypos != GLFW_ANY_POSITION)