From b9403da30ac3ceb5cd9111b4af5dab41215815b8 Mon Sep 17 00:00:00 2001
From: Rene Lindsay <rene@lunarg.com>
Date: Fri, 1 Jul 2016 18:00:30 -0600
Subject: demos: Set window minimum size on windows.

Vulkan surface must be at least 1 pixel high, to prevent crash.

Change-Id: I0000000decaf15bad00000000000000000000026
---
 demos/cube.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/demos/cube.c b/demos/cube.c
index f675ca5a..dbaeb352 100644
--- a/demos/cube.c
+++ b/demos/cube.c
@@ -299,6 +299,7 @@ struct demo {
     HINSTANCE connection;        // hInstance - Windows Instance
     char name[APP_NAME_STR_LEN]; // Name to put on the window/icon
     HWND window;                 // hWnd - window handle
+    POINT minsize;               // minimum window size
 #elif defined(VK_USE_PLATFORM_XLIB_KHR) | defined(VK_USE_PLATFORM_XCB_KHR)
     Display* display;
     Window xlib_window;
@@ -2039,6 +2040,9 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
     case WM_PAINT:
         demo_run(&demo);
         break;
+    case WM_GETMINMAXINFO:     // set window's minimum size
+        ((MINMAXINFO*)lParam)->ptMinTrackSize = demo.minsize;
+        return 0;
     case WM_SIZE:
         // Resize the application to the new window size, except when
         // it was minimized. Vulkan doesn't support images or swapchains
@@ -2099,6 +2103,9 @@ static void demo_create_window(struct demo *demo) {
         fflush(stdout);
         exit(1);
     }
+    // Window client area size must be at least 1 pixel high, to prevent crash.
+    demo->minsize.x = GetSystemMetrics(SM_CXMINTRACK);
+    demo->minsize.y = GetSystemMetrics(SM_CYMINTRACK)+1;
 }
 #elif defined(VK_USE_PLATFORM_XLIB_KHR) | defined(VK_USE_PLATFORM_XCB_KHR)
 static void demo_create_xlib_window(struct demo *demo) {
-- 
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