Minor API cleanup.

apps/clock/clock.c

@@ -189,23 +189,20 @@ int32_t appMain(DxeAppContextT *ctx) {
     sWin->onClose = onClose;
     sWin->onPaint = onPaint;
 
-    // Initial paint into content buffer
+    // Initial paint — dvxInvalidateWindow calls onPaint automatically
-    RectT full = {0, 0, sWin->contentW, sWin->contentH};
-    onPaint(sWin, &full);
     dvxInvalidateWindow(ac, sWin);
 
     // Main loop: check if the second has changed, repaint if so, then yield.
     // tsYield() transfers control back to the shell's task scheduler.
     // On a 486, time() resolution is 1 second, so we yield many times per
     // second between actual updates — this keeps CPU usage near zero.
-    // dvxInvalidateWindow marks the window dirty so the compositor will
+    // dvxInvalidateWindow marks the window dirty and calls onPaint to
-    // flush it to the LFB on the next composite pass.
+    // update the content buffer before the compositor flushes it.
     while (!sState.quit) {
         time_t now = time(NULL);
 
         if (now != sState.lastUpdate) {
             updateTime();
-            onPaint(sWin, &full);
             dvxInvalidateWindow(ac, sWin);
         }
 

dvx/dvxApp.c

@@ -1567,6 +1567,14 @@ void dvxInvalidateRect(AppContextT *ctx, WindowT *win, int32_t x, int32_t y, int
 // ============================================================
 
 void dvxInvalidateWindow(AppContextT *ctx, WindowT *win) {
+    // Call the window's paint callback to update the content buffer
+    // before marking the screen dirty. This means raw-paint apps only
+    // need to call dvxInvalidateWindow — onPaint fires automatically.
+    if (win->onPaint) {
+        RectT fullRect = {0, 0, win->contentW, win->contentH};
+        win->onPaint(win, &fullRect);
+    }
+
     win->contentDirty = true;
     dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
 }

dvx/widgets/widgetEvent.c

@@ -663,18 +663,12 @@ void widgetOnScroll(WindowT *win, ScrollbarOrientE orient, int32_t value) {
     (void)orient;
     (void)value;
 
-    // Repaint with new scroll position
+    // Repaint with new scroll position — dvxInvalidateWindow calls onPaint
-    if (win->onPaint) {
+    if (win->widgetRoot) {
-        RectT fullRect = {0, 0, win->contentW, win->contentH};
+        AppContextT *ctx = wgtGetContext(win->widgetRoot);
-        win->onPaint(win, &fullRect);
 
-        // Dirty the window content area on screen so compositor redraws it
+        if (ctx) {
-        if (win->widgetRoot) {
+            dvxInvalidateWindow(ctx, win);
-            AppContextT *ctx = wgtGetContext(win->widgetRoot);
-
-            if (ctx) {
-                dvxInvalidateWindow(ctx, win);
-            }
         }
     }
 }

dvx/widgets/widgetOps.c

@@ -389,13 +389,8 @@ void wgtInvalidate(WidgetT *w) {
         widgetManageScrollbars(w->window, ctx);
     }
 
-    // Repaint (use win->onPaint so custom paint handlers like dialogs work)
+    // Dirty the window — dvxInvalidateWindow calls onPaint automatically
-    WindowT *win = w->window;
+    dvxInvalidateWindow(ctx, w->window);
-    RectT fullRect = {0, 0, win->contentW, win->contentH};
-    win->onPaint(win, &fullRect);
-
-    // Dirty the window on screen
-    dvxInvalidateWindow(ctx, win);
 }
 
 
@@ -424,11 +419,8 @@ void wgtInvalidatePaint(WidgetT *w) {
         return;
     }
 
-    // Repaint without measure/layout (use win->onPaint so custom handlers work)
+    // Dirty the window — dvxInvalidateWindow calls onPaint automatically
-    WindowT *win = w->window;
+    dvxInvalidateWindow(ctx, w->window);
-    RectT fullRect = {0, 0, win->contentW, win->contentH};
-    win->onPaint(win, &fullRect);
-    dvxInvalidateWindow(ctx, win);
 }
 
 

dvx/widgets/widgetTextInput.c

@@ -319,8 +319,6 @@ void clearOtherSelections(WidgetT *except) {
     }
 
     if (clearSelectionOnWidget(prev) && prevWin != except->window) {
-        RectT fullRect = {0, 0, prevWin->contentW, prevWin->contentH};
-        widgetOnPaint(prevWin, &fullRect);
         dvxInvalidateWindow(ctx, prevWin);
     }
 }