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Provide utilities to allow dpi dependent zooming of fonts
This contribution extends the support for dynamical adaption on SWT applications on DPI related zoom changes in the win32 implementation by adding support to provider and cache scaled variants of Font. It consists of: - internal font registries to enable reusage of scaled variants of fonts. If a font is disposed from external, it will be automatically recreated on demand. There are two registries: - a default registry to mimic the existing behavior, that all fonts are scaled to the native zoom of the primary monitor - a registry to create and manage scaled variants of fonts The SWTFontProvider is configured based on the "swt.autoScale.updateOnRuntime"-flag to use one of the two font registries. The creation of system fonts is adapted to use the provider Contributes to eclipse-platform#62 and eclipse-platform#127
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...es/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/internal/DefaultSWTFontRegistry.java
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| /******************************************************************************* | ||
| * Copyright (c) 2024 Yatta Solutions | ||
| * | ||
| * This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License 2.0 | ||
| * which accompanies this distribution, and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| * | ||
| * Contributors: | ||
| * Yatta Solutions - initial API and implementation | ||
| *******************************************************************************/ | ||
| package org.eclipse.swt.internal; | ||
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| import java.util.*; | ||
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| import org.eclipse.swt.graphics.*; | ||
| import org.eclipse.swt.internal.win32.*; | ||
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| /** | ||
| * This class is used in the win32 implementation only to support | ||
| * unscaled fonts in multiple DPI zoom levels. | ||
| * | ||
| * As this class is only intended to be used internally via {@code SWTFontProvider}, | ||
| * it should neither be instantiated nor referenced in a client application. | ||
| * The behavior can change any time in a future release. | ||
| * | ||
| * @noreference This class is not intended to be referenced by clients. | ||
| * @noinstantiate This class is not intended to be instantiated by clients. | ||
| */ | ||
| public final class DefaultSWTFontRegistry implements SWTFontRegistry { | ||
| private static FontData KEY_SYSTEM_FONTS = new FontData(); | ||
| private Map<FontData, Font> fontsMap = new HashMap<>(); | ||
| private Device device; | ||
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| public DefaultSWTFontRegistry(Device device) { | ||
| this.device = device; | ||
| } | ||
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| @Override | ||
| public Font getSystemFont(int zoom) { | ||
| if (fontsMap.containsKey(KEY_SYSTEM_FONTS)) { | ||
| return fontsMap.get(KEY_SYSTEM_FONTS); | ||
| } | ||
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| long hFont = 0; | ||
| NONCLIENTMETRICS info = new NONCLIENTMETRICS (); | ||
| info.cbSize = NONCLIENTMETRICS.sizeof; | ||
| if (OS.SystemParametersInfo (OS.SPI_GETNONCLIENTMETRICS, 0, info, 0)) { | ||
| hFont = OS.CreateFontIndirect (info.lfMessageFont); | ||
| } | ||
| if (hFont == 0) hFont = OS.GetStockObject (OS.DEFAULT_GUI_FONT); | ||
| if (hFont == 0) hFont = OS.GetStockObject (OS.SYSTEM_FONT); | ||
| Font font = Font.win32_new(device, hFont); | ||
| registerFont(KEY_SYSTEM_FONTS, font); | ||
| return font; | ||
| } | ||
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| @Override | ||
| public Font getFont(FontData fontData, int zoom) { | ||
| if (fontsMap.containsKey(fontData)) { | ||
| Font font = fontsMap.get(fontData); | ||
| if (font.isDisposed()) { | ||
| // Remove disposed cached fonts | ||
| fontsMap.remove(fontData); | ||
| } else { | ||
| return font; | ||
| } | ||
| } | ||
| Font font = new Font(device, fontData); | ||
| registerFont(fontData, font); | ||
| return font; | ||
| } | ||
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| private Font registerFont(FontData fontData, Font font) { | ||
| fontsMap.put(fontData, font); | ||
| return font; | ||
| } | ||
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| @Override | ||
| public void dispose() { | ||
| for (Font font : fontsMap.values()) { | ||
| if (font != null) { | ||
| font.dispose(); | ||
| } | ||
| } | ||
| } | ||
| } |
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