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Cache the last created temporary handles at a requested size #2601

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Cache the last created temporary handles at a requested size #2601

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43 changes: 33 additions & 10 deletions bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Image.java
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Original file line number Diff line number Diff line change
Expand Up @@ -141,6 +141,31 @@ public final class Image extends Resource implements Drawable {

private List<Consumer<Image>> onDisposeListeners;

private record CachedHandle(ImageHandle handleContainer, int requestedWidth, int requestedHeight, int handleWidth,
int handleHeight) {

public void destroy() {
if (handleContainer != null) {
handleContainer.destroy();
}
}

public boolean isReusable(int height, int width) {
return (requestedHeight == height && requestedWidth == width)
|| (handleHeight == height && handleWidth == width);

}

public long getHandle() {
if (handleContainer != null) {
return handleContainer.handle;
}
return -1;
}
};

CachedHandle lastRequestedHandle = new CachedHandle(null, SWT.DEFAULT, SWT.DEFAULT, SWT.DEFAULT, SWT.DEFAULT);

private Image (Device device, int type, long handle, int nativeZoom) {
super(device);
this.type = type;
Expand Down Expand Up @@ -828,17 +853,14 @@ interface HandleAtSizeConsumer {
void executeOnImageHandleAtSize(HandleAtSizeConsumer handleAtSizeConsumer, int widthHint, int heightHint) {
ImageData imageData;
imageData = this.imageProvider.loadImageDataAtSize(widthHint, heightHint);
executeOnImageHandle(handleAtSizeConsumer, imageData);
}

private void executeOnImageHandle(HandleAtSizeConsumer handleAtSizeConsumer, ImageData imageData) {
ImageHandle handleContainer = init(imageData, -1);
long tempHandle = handleContainer.handle;
try {
handleAtSizeConsumer.accept(tempHandle, new Point(imageData.width, imageData.height));
} finally {
handleContainer.destroy();
if (!lastRequestedHandle.isReusable(heightHint, widthHint)) {
lastRequestedHandle.destroy();
ImageHandle handleContainer = init(imageData, -1);
lastRequestedHandle = new CachedHandle(handleContainer, widthHint, heightHint, imageData.width,
imageData.height);
}
handleAtSizeConsumer.accept(lastRequestedHandle.getHandle(),
new Point(lastRequestedHandle.handleWidth, lastRequestedHandle.handleHeight));
}

/**
Expand Down Expand Up @@ -1090,6 +1112,7 @@ private void destroyHandles(Predicate<Integer> filter) {
imageHandle.destroy();
}
}
lastRequestedHandle.destroy();
}

/**
Expand Down
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