Fixing transparency on scaled variant of cursor with source and mask #2562
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When creating a custom cursor using source and mask ImageData, the transparency mask does not scale correctly when applying DPIUtil.autoScaleImageData() in a multi-monitor setup with different DPI settings. With this change we use scaleTo method to scale the data.
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When creating a custom cursor using source and mask ImageData, the transparency mask does not scale correctly when applying DPIUtil.autoScaleImageData() in a multi-monitor setup with different DPI settings. With this change we use scaleTo method to scale the data.
How to test
Run the
Snippet386with following VM argumentsOn 100% monitor zoom, choose the
Cursor(Device, ImageData, ImageData, int, int)option from the dropdownYou will see the dotted square (a transparent pixel after each solid pixel)
Move the shell to another monitor with different zoom e.g. 150%
Previously you would lose the transparency completely when it was scaled with
DPIUtil.scaleImageDataComparison of mask data before and after scaling with and without this PR
Before
After:
P.S: With this change we will not get smooth scaling for the cursor created with source and mask data. That's why we will deprecate the Cursor(Device, ImageData, ImageData, int, int) constructor in another PR, see vi-eclipse/Eclipse-Platform#462. Instead, we will recommend using: Cursor(Device device, ImageDataProvider imageDataProvider, int hotspotX, int hotspotY) as this provides better results with multi-monitor DPI scaling.