[win32] Foward native zoom to draw bitmap in GC

Author: akoch-yatta

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/GC.java

@@ -1253,7 +1253,7 @@ private void drawImage(Image srcImage, int srcX, int srcY, int srcWidth, int src
 		}
 		return;
 	}
-	long imageHandle = Image.win32_getHandle(srcImage, imageZoom);
+	long imageHandle = srcImage.getHandle(imageZoom, data.nativeZoom);
 	switch (srcImage.type) {
 		case SWT.BITMAP:
 			drawBitmap(srcImage, imageHandle, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, simple);
@@ -4384,7 +4384,7 @@ private void init(Drawable drawable, GCData data, long hDC) {
 	}
 	Image image = data.image;
 	if (image != null) {
-		data.hNullBitmap = OS.SelectObject(hDC, Image.win32_getHandle(image, data.nativeZoom));
+		data.hNullBitmap = OS.SelectObject(hDC, image.getHandle(data.imageZoom, data.nativeZoom));
 		image.memGC = this;
 	}
 	int layout = data.layout;

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/GCData.java

@@ -48,6 +48,7 @@ public final class GCData {
 	public float lineMiterLimit = 10;
 	public int alpha = 0xFF;
 	public int nativeZoom;
+	public int imageZoom;
 
 	public Image image;
 	public PAINTSTRUCT ps;
@@ -67,6 +68,7 @@ void copyTo(GCData originalData) {
 		originalData.font = font;
 		originalData.nativeZoom = nativeZoom;
 		originalData.image = image;
+		originalData.imageZoom = imageZoom;
 		originalData.ps = ps;
 		originalData.layout = layout;
 		originalData.hwnd = hwnd;

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Image.java

@@ -829,10 +829,22 @@ private ImageHandle getImageMetadata(ZoomContext zoomContext) {
  * @noreference This method is not intended to be referenced by clients.
  */
 public static long win32_getHandle (Image image, int zoom) {
-	if (image.isDisposed()) {
+	return image.getHandle(zoom, zoom);
+}
+
+long getHandle (int targetZoom, int nativeZoom) {
+	if (isDisposed()) {
 		return 0L;
 	}
-	return image.getImageMetadata(new ZoomContext(zoom)).handle;
+	if (targetZoom == nativeZoom || !imageProvider.supportComplexZoom()) {
+		return getImageMetadata(new ZoomContext(targetZoom)).handle;
+	}
+
+	ZoomContext zoomContext = new ZoomContext(targetZoom, nativeZoom);
+	if (memGC != null) {
+		return imageProvider.newImageHandle(zoomContext).handle;
+	}
+	return getImageMetadata(zoomContext).handle;
 }
 
 /**
@@ -1772,6 +1784,7 @@ private long configureGC(GCData data, ZoomContext zoomContext) {
 		}
 		data.device = device;
 		data.nativeZoom = zoomContext.nativeZoom();
+		data.imageZoom = zoomContext.targetZoom();
 		data.image = this;
 		data.font = SWTFontProvider.getSystemFont(device, zoomContext.nativeZoom());
 	}
@@ -1933,6 +1946,10 @@ private abstract class AbstractImageProviderWrapper {
 
 	protected abstract Rectangle getBounds(int zoom);
 
+	protected boolean supportComplexZoom() {
+		return false;
+	}
+
 	protected long configureGCData(GCData data) {
 		return configureGC(data, new ZoomContext(100));
 	}
@@ -2158,14 +2175,19 @@ private class PlainImageProviderWrapper extends AbstractImageProviderWrapper {
 		type = SWT.BITMAP;
 	}
 
+	@Override
+	protected boolean supportComplexZoom() {
+		return memGC != null;
+	}
+
 	@Override
 	public Collection<Integer> getPreservedZoomLevels() {
 		return Collections.singleton(baseZoom);
 	}
 
 	@Override
 	protected long configureGCData(GCData data) {
-		return configureGC(data, new ZoomContext(DPIUtil.getDeviceZoom()));
+		return configureGC(data, new ZoomContext(DPIUtil.getDeviceZoom(), DPIUtil.getNativeDeviceZoom()));
 	}
 
 	@Override
@@ -2597,6 +2619,11 @@ private class ImageGcDrawerWrapper extends DynamicImageProviderWrapper {
 		this.height = height;
 	}
 
+	@Override
+	protected boolean supportComplexZoom() {
+		return true;
+	}
+
 	@Override
 	protected Rectangle getBounds(int zoom) {
 		Rectangle rectangle = new Rectangle(0, 0, width, height);