Made the window ICMProfile filename per-window

The event no longer spams each time a window gets focus if there are windows on monitors with different color profiles.

This also has the side effect that you no longer get a color profile event at window creation, which is consistent with other events that communicate state changes.

src/video/windows/SDL_windowsevents.c

@@ -621,29 +621,6 @@ WIN_KeyboardHookProc(int nCode, WPARAM wParam, LPARAM lParam)
     return 1;
 }
 
-static void WIN_CheckICMProfileChanged(SDL_Window* window)
-{
-    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
-    SDL_DisplayData *data = display ? (SDL_DisplayData*)display->driverdata : NULL;
-
-    if (data) {
-        HDC hdc = CreateDCW(data->DeviceName, NULL, NULL, NULL);
-        if (hdc) {
-            static WCHAR currentIcmFileName[MAX_PATH];
-            WCHAR icmFileName[MAX_PATH];
-            DWORD fileNameSize = SDL_arraysize(icmFileName);
-            if (GetICMProfileW(hdc, &fileNameSize, icmFileName)) {
-                /* fileNameSize includes '\0' on return */
-                fileNameSize *= sizeof(icmFileName[0]);
-                if (SDL_memcmp(currentIcmFileName, icmFileName, fileNameSize) != 0) {
-                    SDL_memcpy(currentIcmFileName, icmFileName, fileNameSize);
-                    SDL_SendWindowEvent(window, SDL_WINDOWEVENT_ICCPROF_CHANGED, 0, 0);
-                }
-            }
-            DeleteDC(hdc);
-        }
-    }
-}
 #endif /*!defined(__XBOXONE__) && !defined(__XBOXSERIES__)*/
 
 LRESULT CALLBACK
@@ -716,7 +693,7 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
                actually being the foreground window, but this appears to get called in all cases where
                the global foreground window changes to and from this window. */
             WIN_UpdateFocus(data->window, !!wParam);
-            WIN_CheckICMProfileChanged(data->window);
+            WIN_UpdateWindowICCProfile(data->window, SDL_TRUE);
         }
         break;
 
@@ -1221,7 +1198,7 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
             /* Forces a WM_PAINT event */
             InvalidateRect(hwnd, NULL, FALSE);
 
-            WIN_CheckICMProfileChanged(data->window);
+            WIN_UpdateWindowICCProfile(data->window, SDL_TRUE);
         }
         break;
 

src/video/windows/SDL_windowsmodes.c

@@ -325,12 +325,11 @@ WIN_AddDisplay(_THIS, HMONITOR hMonitor, const MONITORINFOEXW *info, SDL_bool se
         }
     }
 
-    displaydata = (SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
+    displaydata = (SDL_DisplayData *) SDL_calloc(1, sizeof(*displaydata));
     if (!displaydata) {
         return SDL_FALSE;
     }
-    SDL_memcpy(displaydata->DeviceName, info->szDevice,
-               sizeof(displaydata->DeviceName));
+    SDL_memcpy(displaydata->DeviceName, info->szDevice, sizeof(displaydata->DeviceName));
     displaydata->MonitorHandle = hMonitor;
     displaydata->IsValid = SDL_TRUE;
 

src/video/windows/SDL_windowswindow.c

@@ -29,6 +29,7 @@
 #include "../SDL_pixels_c.h"
 #include "../../events/SDL_keyboard_c.h"
 #include "../../events/SDL_mouse_c.h"
+#include "../../events/SDL_windowevents_c.h"
 #include "../../SDL_hints_c.h"
 
 #include "SDL_windowsvideo.h"
@@ -390,6 +391,7 @@ SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, HWND parent, SDL_bool cre
             window->y = y;
         }
     }
+    WIN_UpdateWindowICCProfile(window, SDL_FALSE);
 #endif
     {
         DWORD style = GetWindowLong(hwnd, GWL_STYLE);
@@ -461,6 +463,9 @@ static void CleanupWindowData(_THIS, SDL_Window * window)
         SDL_DelHintCallback(SDL_HINT_MOUSE_RELATIVE_MODE_CENTER, WIN_MouseRelativeModeCenterChanged, data);
 
 #if !defined(__XBOXONE__) && !defined(__XBOXSERIES__)
+        if (data->ICMFileName) {
+            SDL_free(data->ICMFileName);
+        }
         if (data->keyboard_hook) {
             UnhookWindowsHookEx(data->keyboard_hook);
         }
@@ -1013,29 +1018,53 @@ WIN_SetWindowGammaRamp(_THIS, SDL_Window * window, const Uint16 * ramp)
     return succeeded ? 0 : -1;
 }
 
-void*
-WIN_GetWindowICCProfile(_THIS, SDL_Window * window, size_t * size)
+void
+WIN_UpdateWindowICCProfile(SDL_Window * window, SDL_bool send_event)
 {
-    SDL_VideoDisplay* display = SDL_GetDisplayForWindow(window);
-    SDL_DisplayData* data = (SDL_DisplayData*)display->driverdata;
-    HDC hdc;
-    BOOL succeeded = FALSE;
-    WCHAR filename[MAX_PATH];
-    DWORD fileNameSize = MAX_PATH;
-    void* iccProfileData = NULL;
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
+    SDL_DisplayData *displaydata = display ? (SDL_DisplayData*)display->driverdata : NULL;
 
-    hdc = CreateDCW(data->DeviceName, NULL, NULL, NULL);
-    if (hdc) {
-        succeeded = GetICMProfileW(hdc, &fileNameSize, filename);
-        DeleteDC(hdc);
+    if (displaydata) {
+        HDC hdc = CreateDCW(displaydata->DeviceName, NULL, NULL, NULL);
+        if (hdc) {
+            WCHAR fileName[MAX_PATH];
+            DWORD fileNameSize = SDL_arraysize(fileName);
+            if (GetICMProfileW(hdc, &fileNameSize, fileName)) {
+                /* fileNameSize includes '\0' on return */
+                if (!data->ICMFileName ||
+                    SDL_wcscmp(data->ICMFileName, fileName) != 0) {
+                    if (data->ICMFileName) {
+                        SDL_free(data->ICMFileName);
+                    }
+                    data->ICMFileName = SDL_wcsdup(fileName);
+                    if (send_event) {
+                        SDL_SendWindowEvent(window, SDL_WINDOWEVENT_ICCPROF_CHANGED, 0, 0);
+                    }
+                }
+            }
+            DeleteDC(hdc);
+        }
     }
+}
+
+void *
+WIN_GetWindowICCProfile(_THIS, SDL_Window * window, size_t * size)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    char *filename_utf8;
+    void *iccProfileData = NULL;
 
-    if (succeeded) {
-        iccProfileData = SDL_LoadFile(WIN_StringToUTF8(filename), size);
-        if (!iccProfileData)
+    filename_utf8 = WIN_StringToUTF8(data->ICMFileName);
+    if (filename_utf8) {
+        iccProfileData = SDL_LoadFile(filename_utf8, size);
+        if (!iccProfileData) {
             SDL_SetError("Could not open ICC profile");
+        }
+        SDL_free(filename_utf8);
+    } else {
+        SDL_OutOfMemory();
     }
-
     return iccProfileData;
 }
 

src/video/windows/SDL_windowswindow.h

@@ -62,6 +62,7 @@ typedef struct
     RECT cursor_clipped_rect;
     SDL_Point last_raw_mouse_position;
     SDL_bool mouse_tracked;
+    WCHAR *ICMFileName;
     struct SDL_VideoData *videodata;
 #if SDL_VIDEO_OPENGL_EGL  
     EGLSurface egl_surface;
@@ -92,6 +93,7 @@ extern void WIN_SetWindowResizable(_THIS, SDL_Window * window, SDL_bool resizabl
 extern void WIN_SetWindowAlwaysOnTop(_THIS, SDL_Window * window, SDL_bool on_top);
 extern void WIN_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen);
 extern int WIN_SetWindowGammaRamp(_THIS, SDL_Window * window, const Uint16 * ramp);
+extern void WIN_UpdateWindowICCProfile(SDL_Window * window, SDL_bool send_event);
 extern void* WIN_GetWindowICCProfile(_THIS, SDL_Window * window, size_t * size);
 extern int WIN_GetWindowGammaRamp(_THIS, SDL_Window * window, Uint16 * ramp);
 extern void WIN_SetWindowMouseRect(_THIS, SDL_Window * window);