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Fixed Program Icon Scaling for Multi Zoom
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This contribution reimplements the logic for scaling the Program Icons
while getting rid of the DPIUtil::getDeviceZoom usage and enhancing the image
quality of icons on scaling up.

contributes to #62 and #127
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@amartya4256
amartya4256 committed Jan 9, 2025
1 parent 9a9747e commit 2b5e970
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Showing 6 changed files with 29 additions and 19 deletions.
2 changes: 1 addition & 1 deletion ...es/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ImageTransfer.java
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Expand Up @@ -184,7 +184,7 @@ public Object nativeToJava(TransferData transferData) {
pSourceBits -= scanline;
}
}
Image image = Image.win32_new(null, SWT.BITMAP, memDib);
Image image = Image.win32_new(null, SWT.BITMAP, memDib, DPIUtil.getNativeDeviceZoom());
ImageData data = image.getImageData (DPIUtil.getDeviceZoom ());
OS.DeleteObject(memDib);
image.dispose();
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1 change: 1 addition & 0 deletions bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/win32/OS.java
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Expand Up @@ -1210,6 +1210,7 @@ public class OS extends C {
public static final int SHADEBLENDCAPS = 120;
public static final int SHGFI_ICON = 0x000000100;
public static final int SHGFI_SMALLICON= 0x1;
public static final int SHGFI_LARGEICON= 0x0;
public static final int SHGFI_USEFILEATTRIBUTES = 0x000000010;
public static final int SIGDN_FILESYSPATH = 0x80058000;
public static final int SIF_ALL = 0x17;
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20 changes: 12 additions & 8 deletions bundles/org.eclipse.swt/Eclipse SWT Program/win32/org/eclipse/swt/program/Program.java
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Expand Up @@ -19,7 +19,6 @@

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.widgets.*;

Expand Down Expand Up @@ -382,16 +381,21 @@ public ImageData getImageData () {
public ImageData getImageData (int zoom) {
// Windows API returns image data according to primary monitor zoom factor
// rather than at original scaling
int nativeZoomFactor = 100 * Display.getCurrent().getPrimaryMonitor().getZoom() / DPIUtil.getDeviceZoom();
int imageZoomFactor = 100 * zoom / nativeZoomFactor;
int initialNativeZoom = Display.getCurrent().getPrimaryMonitor().getZoom();
if (extension != null) {
SHFILEINFO shfi = new SHFILEINFO ();
int flags = OS.SHGFI_ICON | OS.SHGFI_SMALLICON | OS.SHGFI_USEFILEATTRIBUTES;
int flags = OS.SHGFI_ICON | OS.SHGFI_USEFILEATTRIBUTES;
if(zoom > initialNativeZoom) {
flags |= OS.SHGFI_LARGEICON;
initialNativeZoom *= 2;
} else {
flags |= OS.SHGFI_SMALLICON;
}
TCHAR pszPath = new TCHAR (0, extension, true);
OS.SHGetFileInfo (pszPath.chars, OS.FILE_ATTRIBUTE_NORMAL, shfi, SHFILEINFO.sizeof, flags);
if (shfi.hIcon != 0) {
Image image = Image.win32_new (null, SWT.ICON, shfi.hIcon);
ImageData imageData = image.getImageData (imageZoomFactor);
Image image = Image.win32_new (null, SWT.ICON, shfi.hIcon, initialNativeZoom);
ImageData imageData = image.getImageData (zoom);
image.dispose ();
return imageData;
}
Expand All @@ -416,8 +420,8 @@ public ImageData getImageData (int zoom) {
long [] phiconSmall = new long[1], phiconLarge = null;
OS.ExtractIconEx (lpszFile, nIconIndex, phiconLarge, phiconSmall, 1);
if (phiconSmall [0] == 0) return null;
Image image = Image.win32_new (null, SWT.ICON, phiconSmall [0]);
ImageData imageData = image.getImageData (imageZoomFactor);
Image image = Image.win32_new (null, SWT.ICON, phiconSmall [0], initialNativeZoom);
ImageData imageData = image.getImageData (zoom);
image.dispose ();
return imageData;
}
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12 changes: 8 additions & 4 deletions bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Image.java
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Expand Up @@ -127,8 +127,12 @@ public final class Image extends Resource implements Drawable {
* Prevents uninitialized instances from being created outside the package.
*/
Image (Device device) {
this(device, DPIUtil.getNativeDeviceZoom());
}

private Image (Device device, int nativeZoom) {
super(device);
initialNativeZoom = DPIUtil.getNativeDeviceZoom();
initialNativeZoom = nativeZoom;
this.device.registerResourceWithZoomSupport(this);
}

Expand Down Expand Up @@ -2030,10 +2034,10 @@ public String toString () {
*
* @noreference This method is not intended to be referenced by clients.
*/
public static Image win32_new(Device device, int type, long handle) {
Image image = new Image(device);
public static Image win32_new(Device device, int type, long handle, int nativeZoom) {
Image image = new Image(device, nativeZoom);
image.type = type;
image.new ImageHandle(handle, image.getZoom());
image.new ImageHandle(handle, nativeZoom);
return image;
}

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11 changes: 6 additions & 5 deletions bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Display.java
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Expand Up @@ -1203,7 +1203,7 @@ static Image createIcon (Image image, int zoom) {
if (hIcon == 0) SWT.error(SWT.ERROR_NO_HANDLES);
OS.DeleteObject (hBitmap);
OS.DeleteObject (hMask);
return Image.win32_new (device, SWT.ICON, hIcon);
return Image.win32_new (device, SWT.ICON, hIcon, zoom);
}

long getTextSearchIcon(int size) {
Expand Down Expand Up @@ -2542,27 +2542,28 @@ Font getSystemFont (int zoom) {
*/
public Image getSystemImage (int id) {
checkDevice ();
int primaryMonitorNativeZoom = getPrimaryMonitor().getZoom();
switch (id) {
case SWT.ICON_ERROR: {
if (errorImage != null) return errorImage;
long hIcon = OS.LoadImage (0, OS.OIC_HAND, OS.IMAGE_ICON, 0, 0, OS.LR_SHARED);
return errorImage = Image.win32_new (this, SWT.ICON, hIcon);
return errorImage = Image.win32_new (this, SWT.ICON, hIcon, primaryMonitorNativeZoom);
}
case SWT.ICON_WORKING:
case SWT.ICON_INFORMATION: {
if (infoImage != null) return infoImage;
long hIcon = OS.LoadImage (0, OS.OIC_INFORMATION, OS.IMAGE_ICON, 0, 0, OS.LR_SHARED);
return infoImage = Image.win32_new (this, SWT.ICON, hIcon);
return infoImage = Image.win32_new (this, SWT.ICON, hIcon, primaryMonitorNativeZoom);
}
case SWT.ICON_QUESTION: {
if (questionImage != null) return questionImage;
long hIcon = OS.LoadImage (0, OS.OIC_QUES, OS.IMAGE_ICON, 0, 0, OS.LR_SHARED);
return questionImage = Image.win32_new (this, SWT.ICON, hIcon);
return questionImage = Image.win32_new (this, SWT.ICON, hIcon, primaryMonitorNativeZoom);
}
case SWT.ICON_WARNING: {
if (warningIcon != null) return warningIcon;
long hIcon = OS.LoadImage (0, OS.OIC_BANG, OS.IMAGE_ICON, 0, 0, OS.LR_SHARED);
return warningIcon = Image.win32_new (this, SWT.ICON, hIcon);
return warningIcon = Image.win32_new (this, SWT.ICON, hIcon, primaryMonitorNativeZoom);
}
}
return null;
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2 changes: 1 addition & 1 deletion bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/TaskBar.java
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Expand Up @@ -166,7 +166,7 @@ IShellLink createShellLink (MenuItem item) {
ImageData data;
if (item.hBitmap != 0) {
long handle = OS.CopyImage(item.hBitmap, SWT.BITMAP, 0, 0, 0);
Image image2 = Image.win32_new (display, SWT.BITMAP, handle);
Image image2 = Image.win32_new (display, SWT.BITMAP, handle, nativeZoom);
data = image2.getImageData (DPIUtil.getDeviceZoom ());
image2.dispose();
} else {
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