Examples: DirectX9: tweaks.

examples/directx9_example/imgui_impl_dx9.cpp

@@ -219,7 +219,7 @@ void ImGui_ImplDX9_Shutdown()
     g_hWnd = 0;
 }
 
-static void ImGui_ImplDX9_CreateFontsTexture()
+static bool ImGui_ImplDX9_CreateFontsTexture()
 {
     ImGuiIO& io = ImGui::GetIO();
 
@@ -231,16 +231,10 @@ static void ImGui_ImplDX9_CreateFontsTexture()
     // Create DX9 texture
     g_FontTexture = NULL;
     if (D3DXCreateTexture(g_pd3dDevice, width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8, D3DPOOL_DEFAULT, &g_FontTexture) < 0)
-    {
-        IM_ASSERT(0);
-        return;
-    }
+        return false;
     D3DLOCKED_RECT tex_locked_rect;
     if (g_FontTexture->LockRect(0, &tex_locked_rect, NULL, 0) != D3D_OK) 
-    {	
-        IM_ASSERT(0); 
-        return; 
-    }
+        return false;
     for (int y = 0; y < height; y++)
         memcpy((unsigned char *)tex_locked_rect.pBits + tex_locked_rect.Pitch * y, pixels + (width * bytes_per_pixel) * y, (width * bytes_per_pixel));
     g_FontTexture->UnlockRect(0);
@@ -251,14 +245,15 @@ static void ImGui_ImplDX9_CreateFontsTexture()
     // Cleanup (don't clear the input data if you want to append new fonts later)
     io.Fonts->ClearInputData();
     io.Fonts->ClearTexData();
+    return true;
 }
 
 bool ImGui_ImplDX9_CreateDeviceObjects()
 {
     if (!g_pd3dDevice)
         return false;
-
-    ImGui_ImplDX9_CreateFontsTexture();
+    if (!ImGui_ImplDX9_CreateFontsTexture())
+        return false;
     return true;
 }