Removing QWidget dependency from src/core.

src/gui/DatabaseIcons.cpp

@@ -0,0 +1,119 @@
+/*
+ *  Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "DatabaseIcons.h"
+
+#include "core/Config.h"
+#include "core/Global.h"
+
+#include <QDir>
+#include <QImageReader>
+#include <QPainter>
+#include <QPixmapCache>
+
+DatabaseIcons* DatabaseIcons::m_instance(nullptr);
+
+namespace
+{
+    const QString iconDir = QStringLiteral(":/icons/database/");
+    QStringList iconList;
+
+    const QString badgeDir = QStringLiteral(":/icons/badges/");
+    QStringList badgeList;
+} // namespace
+
+DatabaseIcons::DatabaseIcons()
+{
+    iconList = QDir(iconDir).entryList(QDir::NoFilter, QDir::Name);
+    badgeList = QDir(badgeDir).entryList(QDir::NoFilter, QDir::Name);
+
+    // Set this early and once to ensure consistent icon size until app restart
+    m_compactMode = config()->get(Config::GUI_CompactMode).toBool();
+}
+
+DatabaseIcons* DatabaseIcons::instance()
+{
+    if (!m_instance) {
+        m_instance = new DatabaseIcons();
+    }
+
+    return m_instance;
+}
+
+QPixmap DatabaseIcons::icon(int index, IconSize size)
+{
+    if (index < 0 || index >= count()) {
+        qWarning("DatabaseIcons::icon: invalid icon index %d, using 0 instead", index);
+        index = 0;
+        Q_ASSERT_X(false, "DatabaseIcons::icon", "invalid icon index %d");
+    }
+
+    auto cacheKey = QString::number(index);
+    auto icon = m_iconCache.value(cacheKey);
+    if (icon.isNull()) {
+        icon.addFile(iconDir + iconList[index]);
+        icon.addPixmap(icon.pixmap(64));
+        m_iconCache.insert(cacheKey, icon);
+    }
+
+    return icon.pixmap(iconSize(size));
+}
+
+QPixmap DatabaseIcons::applyBadge(const QPixmap& basePixmap, Badges badgeIndex)
+{
+    const auto cacheKey = QStringLiteral("badgedicon-%1-%2").arg(basePixmap.cacheKey()).arg(badgeIndex);
+    QPixmap pixmap = basePixmap;
+    if (badgeIndex < 0 || badgeIndex >= badgeList.size()) {
+        qWarning("DatabaseIcons: Out-of-range badge index given to applyBadge: %d", badgeIndex);
+    } else if (!QPixmapCache::find(cacheKey, &pixmap)) {
+        int baseSize = basePixmap.width();
+        int badgeSize =
+            baseSize <= iconSize(IconSize::Default) * basePixmap.devicePixelRatio() ? baseSize * 0.6 : baseSize * 0.5;
+        QPoint badgePos(baseSize - badgeSize, baseSize - badgeSize);
+        badgePos /= basePixmap.devicePixelRatio();
+
+        QImageReader reader(badgeDir + badgeList[badgeIndex]);
+        reader.setScaledSize({badgeSize, badgeSize});
+        auto badge = QPixmap::fromImageReader(&reader);
+        badge.setDevicePixelRatio(basePixmap.devicePixelRatio());
+
+        QPainter painter(&pixmap);
+        painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
+        painter.drawPixmap(badgePos, badge);
+
+        QPixmapCache::insert(cacheKey, pixmap);
+    }
+
+    return pixmap;
+}
+
+int DatabaseIcons::count()
+{
+    return iconList.size();
+}
+
+int DatabaseIcons::iconSize(IconSize size)
+{
+    switch (size) {
+    case Medium:
+        return m_compactMode ? 26 : 30;
+    case Large:
+        return m_compactMode ? 30 : 36;
+    default:
+        return m_compactMode ? 16 : 22;
+    }
+}