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Replace usages of new Image(device, width, height) for Composite #2004

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Merged
merged 1 commit into from
Apr 25, 2025
Merged

Replace usages of new Image(device, width, height) for Composite #2004

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27 changes: 18 additions & 9 deletions bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Composite.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1553,8 +1553,6 @@ LRESULT WM_PAINT (long wParam, long lParam) {
data.ps = ps;
data.hwnd = handle;
GC gc = GC.win32_new (this, data);

/* Get the system region for the paint HDC */
long sysRgn = 0;
if ((style & (SWT.DOUBLE_BUFFERED | SWT.TRANSPARENT)) != 0 || (style & SWT.NO_MERGE_PAINTS) != 0) {
sysRgn = OS.CreateRectRgn (0, 0, 0, 0);
Expand All @@ -1580,14 +1578,25 @@ LRESULT WM_PAINT (long wParam, long lParam) {
GC paintGC = null;
Image image = null;
if ((style & (SWT.DOUBLE_BUFFERED | SWT.TRANSPARENT)) != 0) {
image = new Image (display, width, height);
paintGC = gc;
gc = new GC (image, paintGC.getStyle() & SWT.RIGHT_TO_LEFT);
GCData gcData = gc.getGCData ();
gcData.uiState = data.uiState;
gc.setForeground (getForeground ());
gc.setBackground (getBackground ());
gc.setFont (getFont ());
int originalStyle = gc.getStyle();
ImageGcDrawer drawer = new ImageGcDrawer() {
@Override
public void drawOn(GC gc, int iWidth, int iHeight) {
GCData gcData = gc.getGCData ();
gcData.uiState = data.uiState;
gc.setForeground (getForeground ());
gc.setBackground (getBackground ());
gc.setFont (getFont ());

}

@Override
public int getGcStyle() {
return originalStyle & SWT.RIGHT_TO_LEFT;
}
};
image = new Image (display, drawer, width, height);
if ((style & SWT.TRANSPARENT) != 0) {
OS.BitBlt (gc.handle, 0, 0, width, height, paintGC.handle, ps.left, ps.top, OS.SRCCOPY);
}
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