ImagePreprocessorBuffer: Dedicated class to handle buffer used by spot finding.

image_analysis/image_preprocessing/ImagePreprocessorBuffer.h

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+// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
+// SPDX-License-Identifier: GPL-3.0-only
+
+
+#pragma once
+
+#include <vector>
+#include <cstdint>
+
+class ImagePreprocessorBuffer {
+protected:
+    std::vector<int32_t> buffer;
+public:
+    explicit ImagePreprocessorBuffer(size_t npixels);
+    virtual ~ImagePreprocessorBuffer() = default;
+
+    // Standard CPU operation
+    std::vector<int32_t> &getBuffer();
+    const std::vector<int32_t> &getBuffer() const;
+    int32_t &operator[](size_t i);
+    const int32_t &operator[](size_t i) const;
+    size_t size() const;
+
+    int32_t *data();
+    const int32_t *data() const;
+
+    // GPU operations (overriden in ImagePreprocessorBufferGPU
+    virtual int32_t *getGPUBuffer();
+    virtual const int32_t *getGPUBuffer() const;
+};