12.2a: folders duplicate with their contents, folder opacity, format version 8, View > Snap (Compositor 1.1.5–1.1.6)

src/Rendering/EditorCanvas+Grid.cpp

@@ -0,0 +1,32 @@
+#include "Rendering/EditorCanvas.h"
+#include <QPainterPath>
+#include <cmath>
+
+// One-screen-pixel lines on document pixel boundaries, over the image only.
+void CanvasView::drawPixelGrid(const QRectF &view, const CanvasDocument &document, QPainter &context) const
+{
+    const CanvasViewport &viewport = m_session.viewport;
+    const double points = viewport.pointsPerPixel();
+    const QRectF canvas(viewport.viewPoint(QPointF(0, 0), document.size()), QSizeF(document.width * points, document.height * points));
+    const QRectF area = view.intersected(canvas);
+    if (area.isEmpty())
+        return;
+    const QPointF first = viewport.documentPoint(area.topLeft(), document.size());
+    const QPointF last = viewport.documentPoint(area.bottomRight(), document.size());
+    const double hairline = 1 / viewport.backingScale;
+    // Crossings fill once, as CoreGraphics fills the union.
+    QPainterPath path;
+    path.setFillRule(Qt::WindingFill);
+    for (int column = int(std::ceil(first.x())); column <= int(std::floor(last.x())); ++column) {
+        const double x = viewport.viewPoint(QPointF(column, 0), document.size()).x();
+        path.addRect(QRectF(x - hairline / 2, area.top(), hairline, area.height()));
+    }
+    for (int row = int(std::ceil(first.y())); row <= int(std::floor(last.y())); ++row) {
+        const double y = viewport.viewPoint(QPointF(0, row), document.size()).y();
+        path.addRect(QRectF(area.left(), y - hairline / 2, area.width(), hairline));
+    }
+    context.save();
+    context.setRenderHint(QPainter::Antialiasing, true);
+    context.fillPath(path, QColor::fromRgbF(0.55, 0.55, 0.55, 0.45));
+    context.restore();
+}