Initial implementation of theming

common/themes/icon_utils.cpp

@@ -1,7 +1,28 @@
 #include "icon_utils.h"
 
+#include <QSvgRenderer>
+
 #include "yacreader_global.h"
 
+QPixmap renderSvgToPixmap(const QString &svgPath, int logicalSize, qreal devicePixelRatio)
+{
+    return renderSvgToPixmap(svgPath, logicalSize, logicalSize, devicePixelRatio);
+}
+
+QPixmap renderSvgToPixmap(const QString &svgPath, int logicalWidth, int logicalHeight, qreal devicePixelRatio)
+{
+    const int pixelWidth = qRound(logicalWidth * devicePixelRatio);
+    const int pixelHeight = qRound(logicalHeight * devicePixelRatio);
+    QPixmap pixmap(pixelWidth, pixelHeight);
+    pixmap.fill(Qt::transparent);
+    QPainter painter(&pixmap);
+    QSvgRenderer renderer(svgPath);
+    renderer.render(&painter);
+    painter.end();
+    pixmap.setDevicePixelRatio(devicePixelRatio);
+    return pixmap;
+}
+
 QString readSvg(const QString &resourcePath)
 {
     QFile in(resourcePath);

common/themes/icon_utils.h

@@ -3,6 +3,11 @@
 
 #include <QtGui>
 
+// Render an SVG file to a QPixmap at a specific logical size with HiDPI support.
+// Uses QSvgRenderer to rasterize directly at the target resolution (no upscaling).
+QPixmap renderSvgToPixmap(const QString &svgPath, int logicalSize, qreal devicePixelRatio);
+QPixmap renderSvgToPixmap(const QString &svgPath, int logicalWidth, int logicalHeight, qreal devicePixelRatio);
+
 struct RecolorOptions {
     QString suffix;
     QString fileName;

common/themes/shared/whats_new_dialog_theme.h

@@ -0,0 +1,17 @@
+#ifndef WHATS_NEW_DIALOG_THEME_H
+#define WHATS_NEW_DIALOG_THEME_H
+
+#include <QColor>
+#include <QPixmap>
+
+struct WhatsNewDialogTheme {
+    QColor backgroundColor;
+    QColor headerTextColor;
+    QColor versionTextColor;
+    QColor contentTextColor;
+    QColor linkColor;
+    QPixmap closeButtonIcon;
+    QPixmap headerDecoration;
+};
+
+#endif // WHATS_NEW_DIALOG_THEME_H

common/themes/theme_manager.cpp

@@ -6,6 +6,8 @@
 #include <QGuiApplication>
 #include <QStyleHints>
 
+// TODO: add API to force color scheme     //styleHints->setColorScheme(Qt::ColorScheme::Dark);
+
 ThemeManager::ThemeManager()
 {
 }

common/themes/themes_common.pri

@@ -8,6 +8,7 @@ HEADERS += \
     $$PWD/themable.h \
     $$PWD/yacreader_icon.h \
     $$PWD/shared/help_about_dialog_theme.h \
+    $$PWD/shared/whats_new_dialog_theme.h \
 
 
 SOURCES += \