8340870: [WIN] Checkbox is not sized according to uiScale

src/java.desktop/windows/classes/com/sun/java/swing/plaf/windows/XPStyle.java

@@ -722,7 +722,7 @@ protected void paintToImage(Component c, Image image, Graphics g,
             ThemeReader.paintBackground(SunWritableRaster.stealData(dbi, 0),
                                         part.getControlName(c), part.getValue(),
                                         State.getValue(part, state),
-                                        0, 0, w, h, w, dpi);
+                                        w, h, w, dpi);
 
             SunWritableRaster.markDirty(dbi);
         }

src/java.desktop/windows/classes/sun/awt/windows/ThemeReader.java

@@ -180,22 +180,18 @@ private static Long getTheme(String widget, int dpi) {
 
     private static native void paintBackground(int[] buffer, long theme,
                                                int part, int state,
-                                               int rectRight, int rectBottom,
                                                int w, int h, int stride);
 
     public static void paintBackground(int[] buffer, String widget,
-           int part, int state, int x, int y, int w, int h, int stride, int dpi) {
+           int part, int state, int w, int h, int stride, int dpi) {
         readLock.lock();
         try {
-            /* For widgets and parts in the lists, we get the part size
-            for the current screen DPI to scale them better. */
-            Dimension d = (partSizeWidgets.contains(widget)
-                          && partSizeWidgetParts.contains(Integer.valueOf(part)))
-                          ? getPartSize(getTheme(widget, dpi), part, state)
-                          : new Dimension(w, h);
-
-            paintBackground(buffer, getTheme(widget, dpi), part, state,
-                            d.width, d.height, w, h, stride);
+            // getTheme is not guaranteed to retrieve the theme handle for the desired DPI
+            // if assets for it aren't already loaded by the theming system. In that case,
+            // the closest loaded asset will be used and scaled to fit the provided height
+            // and width by paintBackground. The resulting image won't be as crisp as the
+            // native resolution asset, but it will be the correct size.
+            paintBackground(buffer, getTheme(widget, dpi), part, state, w, h, stride);
         } finally {
             readLock.unlock();
         }

src/java.desktop/windows/native/libawt/windows/ThemeReader.cpp

@@ -393,7 +393,7 @@ static void copyDIBToBufferedImage(int *pDstBits, int *pSrcBits,
  */
 JNIEXPORT void JNICALL Java_sun_awt_windows_ThemeReader_paintBackground
   (JNIEnv *env, jclass klass, jintArray array, jlong theme, jint part, jint state,
-    jint rectRight, jint rectBottom, jint w, jint h, jint stride) {
+    jint w, jint h, jint stride) {
 
     int *pDstBits=NULL;
     int *pSrcBits=NULL;
@@ -440,14 +440,9 @@ JNIEXPORT void JNICALL Java_sun_awt_windows_ThemeReader_paintBackground
 
     rect.left = 0;
     rect.top = 0;
+    rect.bottom = h;
+    rect.right = w;
 
-    if (OpenThemeDataForDpiFunc) {
-        rect.bottom = rectBottom;
-        rect.right = rectRight;
-    } else {
-        rect.bottom = h;
-        rect.right = w;
-    }
     ZeroMemory(pSrcBits,(BITS_PER_PIXEL>>3)*w*h);
 
     HRESULT hres = DrawThemeBackgroundFunc(hTheme, memDC, part, state, &rect, NULL);