65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
#include "ItemIconCache.h"
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#include <QFile>
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#include <QPainter>
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#include <QSvgRenderer>
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ItemIconCache::ItemIconCache(const QString& iconDir)
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: m_iconDir(iconDir)
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{
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}
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const QByteArray& ItemIconCache::getSvg(const std::string& itemId)
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{
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const std::map<std::string, QByteArray>::const_iterator cached =
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m_svgById.find(itemId);
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if (cached != m_svgById.end())
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{
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return cached->second;
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}
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// An absent or unreadable file caches an empty byte array so it is not retried;
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// a missing icon is not an error (REQ-UI-ITEM-ICON).
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QByteArray svg;
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QFile file(m_iconDir + "/" + QString::fromStdString(itemId) + ".svg");
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if (file.open(QIODevice::ReadOnly))
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{
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svg = file.readAll();
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}
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return m_svgById.emplace(itemId, std::move(svg)).first->second;
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}
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bool ItemIconCache::hasIcon(const std::string& itemId)
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{
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return !getSvg(itemId).isEmpty();
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}
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QPixmap ItemIconCache::getPixmap(const std::string& itemId, int sizePx)
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{
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if (sizePx <= 0)
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{
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return QPixmap();
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}
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const std::pair<std::string, int> key(itemId, sizePx);
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const std::map<std::pair<std::string, int>, QPixmap>::const_iterator cached =
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m_pixmapCache.find(key);
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if (cached != m_pixmapCache.end())
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{
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return cached->second;
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}
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const QByteArray& svg = getSvg(itemId);
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QPixmap pixmap;
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if (!svg.isEmpty())
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{
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QSvgRenderer renderer(svg);
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pixmap = QPixmap(sizePx, sizePx);
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pixmap.fill(Qt::transparent);
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QPainter painter(&pixmap);
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painter.setRenderHint(QPainter::Antialiasing, true);
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renderer.render(&painter);
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}
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return m_pixmapCache.emplace(key, std::move(pixmap)).first->second;
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}
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