2511-viewer-enh (#5)

## 1.0.0-rc.100
This is an UNSTABLE release.

* jfjoch_viewer: Fix dbus registration
* jfjoch_viewer: Remove background slider for diffraction image
* jfjoch_viewer: Adjustments for 2D azimuthal image viewer

Reviewed-on: #5
Co-authored-by: Filip Leonarski <filip.leonarski@psi.ch>
Co-committed-by: Filip Leonarski <filip.leonarski@psi.ch>

viewer/widgets/JFJochAzIntImage.cpp

@@ -0,0 +1,95 @@
+// SPDX-FileCopyrightText: 2025 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#include "JFJochAzIntImage.h"
+#include <QVBoxLayout>
+
+#include "../../common/JFJochException.h"
+
+JFJochAzIntImage::JFJochAzIntImage(QWidget *parent)
+    : JFJochImage(parent) {
+}
+
+void JFJochAzIntImage::Clear() {
+    W = 0;
+    H = 0;
+    image_fp.clear();
+    if (scene())
+        scene()->clear();
+}
+
+// data: size = azimuthal_bins * q_bins
+// Layout: q varies fastest (i % q_bins == q index)
+void JFJochAzIntImage::SetData(const std::vector<float> &data,
+                 const std::vector<float> &in_phi,
+                 const std::vector<float> &in_q,
+                 int azimuthal_bins) {
+    if (azimuthal_bins <= 0) {
+        Clear();
+        throw std::runtime_error("azimuthal_bins <= 0");
+    }
+
+    int q_bins = data.size() / azimuthal_bins;
+
+    if (q_bins <= 0 || in_phi.size() != data.size() || in_q.size() != data.size()) {
+        Clear();
+        throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
+                              "Mismatch in input size");
+    }
+
+    float local_min = range_min, local_max = range_max;
+    if (auto_range) {
+        local_min = std::numeric_limits<float>::infinity();
+        local_max = -std::numeric_limits<float>::infinity();
+        for (float v : data) {
+            if (std::isfinite(v)) {
+                if (v < local_min) local_min = v;
+                if (v > local_max) local_max = v;
+            }
+        }
+        if (!std::isfinite(local_min) || !std::isfinite(local_max) || local_max <= local_min) {
+            Clear();
+            return;
+        }
+    } else {
+        if (!(std::isfinite(local_min) && std::isfinite(local_max) && local_max > local_min)) {
+            Clear();
+            return;
+        }
+    }
+
+    phi = in_phi;
+    q = in_q;
+
+    // Update base class members
+    W = q_bins;
+    H = azimuthal_bins;
+    image_fp = data;
+
+    // Update foreground/background for color mapping
+    background = local_min;
+    foreground = local_max;
+
+    // Generate pixmap and redraw using base class functionality
+    GeneratePixmap();
+    Redraw();
+}
+
+void JFJochAzIntImage::mouseHover(QMouseEvent* event) {
+    if (!scene() || W == 0 || H == 0) return;
+
+    QPointF scenePos = mapToScene(event->pos());
+    int x = static_cast<int>(scenePos.x());
+    int y = static_cast<int>(scenePos.y());
+
+    if (x >= 0 && x < static_cast<int>(W) && y >= 0 && y < static_cast<int>(H)) {
+        size_t idx = y * W + x;
+
+        QString statusText = QString("Q: %1 Å^-1 phi: %2° value: %3")
+                .arg(QString::number(q[idx], 'f', 3))
+                .arg(QString::number(phi[idx], 'f', 3))
+                .arg(QString::number(image_fp[idx], 'f', 3));
+
+        emit writeStatusBar(statusText, 0);
+    }
+}