[Cards] Artist attribution (#7092)

* [Cards] Artist attribution

Took 7 minutes

Took 4 minutes

* Nudge attribution pill on home screen to align

Took 3 minutes


Took 28 seconds

Took 38 seconds

* Lint.

Took 3 minutes

* Lint.

Took 2 minutes

* Fix rebase whoopsie

Took 5 minutes

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/cards/art_crop_attribution.cpp

@@ -0,0 +1,61 @@
+#include "art_crop_attribution.h"
+
+#include <QFontMetrics>
+#include <QObject>
+#include <QPainter>
+#include <libcockatrice/card/printing/exact_card.h>
+
+QString buildArtAttribution(const ExactCard &card)
+{
+    const QString artist = card.getPrinting().getArtist();
+    if (artist.isEmpty()) {
+        return QString();
+    }
+    return QObject::tr("Art: %1").arg(artist);
+}
+
+QRectF paintArtAttribution(QPainter &painter,
+                           const QRectF &rect,
+                           const QString &attribution,
+                           Qt::Alignment anchor,
+                           qreal scale)
+{
+    if (attribution.isEmpty()) {
+        return QRectF();
+    }
+
+    painter.save();
+
+    QFont font = painter.font();
+    font.setPointSizeF(qMax(6.0, font.pointSizeF() * scale));
+    painter.setFont(font);
+
+    const QFontMetrics fm(font);
+    const qreal maxTextWidth = rect.width() * 0.45;
+    const QString elided = fm.elidedText(attribution, Qt::ElideRight, qMax(qreal(80.0) * scale, maxTextWidth));
+
+    const qreal pad = 6.0 * scale;
+    QRectF captionRect(QPointF(0, 0), QSizeF(fm.horizontalAdvance(elided) + pad * 2.0, fm.height() + pad * 2.0));
+    const qreal margin = 4.0 * scale;
+    if (anchor.testFlag(Qt::AlignLeft)) {
+        captionRect.moveLeft(rect.left() + margin);
+    } else {
+        captionRect.moveRight(rect.right() - margin);
+    }
+    if (anchor.testFlag(Qt::AlignTop)) {
+        captionRect.moveTop(rect.top() + margin);
+    } else {
+        captionRect.moveBottom(rect.bottom() - margin);
+    }
+
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(QColor(0, 0, 0, 120));
+    painter.drawRoundedRect(captionRect, 4, 4);
+
+    painter.setPen(QColor(255, 255, 255, 220));
+    painter.drawText(captionRect, Qt::AlignCenter, elided);
+
+    painter.restore();
+
+    return captionRect;
+}

cockatrice/src/interface/widgets/cards/art_crop_attribution.h

@@ -0,0 +1,41 @@
+#ifndef COCKATRICE_ART_CROP_ATTRIBUTION_H
+#define COCKATRICE_ART_CROP_ATTRIBUTION_H
+
+#include <QStringView>
+
+class ExactCard;
+class QPainter;
+class QRectF;
+class QString;
+
+/**
+ * @brief Builds an attribution caption for a cropped card art display.
+ *
+ * When a card image's art region is shown cropped (an "art crop"), the artist
+ * should be credited in the same interface. Returns an empty string when the
+ * database has no artist data for the card.
+ *
+ * @param card The card whose art is being displayed.
+ * @return Caption such as "Art: John Avon", or empty.
+ */
+QString buildArtAttribution(const ExactCard &card);
+
+/**
+ * @brief Paints an attribution caption in a corner of a rect.
+ *
+ * Draws a subtle semi-transparent pill containing the caption, elided to fit.
+ *
+ * @param painter Painter to draw with.
+ * @param rect The area (e.g. the cropped art region) the caption belongs to.
+ * @param attribution Caption text (see buildArtAttribution()).
+ * @param anchor Corner of @p rect to pin the pill to (default bottom-right).
+ * @param scale Size multiplier for the pill (e.g. 0.8 for a smaller pill).
+ * @return The rect the pill was drawn in, or an empty rect if @p attribution is empty.
+ */
+QRectF paintArtAttribution(QPainter &painter,
+                           const QRectF &rect,
+                           const QString &attribution,
+                           Qt::Alignment anchor = Qt::AlignRight | Qt::AlignBottom,
+                           qreal scale = 1.0);
+
+#endif // COCKATRICE_ART_CROP_ATTRIBUTION_H