work in progress

designer/src/testing/visual_capture.h

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+// Visual capture for screenshots and image comparison
+#pragma once
+
+#include <string>
+#include <vector>
+#include <cstdint>
+
+namespace mosis::testing {
+
+// PNG image data
+struct ImageData {
+    uint32_t width = 0;
+    uint32_t height = 0;
+    std::vector<uint8_t> pixels;  // RGBA format
+
+    bool IsValid() const { return width > 0 && height > 0 && !pixels.empty(); }
+};
+
+// Result of image comparison
+struct CompareResult {
+    bool match = false;
+    double diff_percent = 0.0;
+    uint32_t diff_pixels = 0;
+    ImageData diff_image;
+};
+
+// Captures and compares screenshots
+class VisualCapture {
+public:
+    VisualCapture() = default;
+
+    // Capture current framebuffer to image
+    ImageData CaptureFramebuffer(uint32_t width, uint32_t height) const;
+
+    // Save image to PNG file
+    bool SavePNG(const ImageData& image, const std::string& path) const;
+
+    // Load PNG file to image
+    ImageData LoadPNG(const std::string& path) const;
+
+    // Compare two images
+    CompareResult Compare(const ImageData& actual, const ImageData& expected, double threshold = 0.01) const;
+
+    // Generate diff image (highlights differences)
+    ImageData GenerateDiff(const ImageData& actual, const ImageData& expected) const;
+
+    // Utility: flip image vertically (for OpenGL coordinate conversion)
+    void FlipVertically(ImageData& image) const;
+};
+
+} // namespace mosis::testing