Add paint stroke sampling tests

src/paint/stroke.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include "foundation/result.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <span>
+#include <vector>
+
+namespace pp::paint {
+
+constexpr std::size_t max_stroke_points = 1000000;
+constexpr std::size_t max_stroke_samples = 1000000;
+
+struct StrokePoint {
+    float x = 0.0F;
+    float y = 0.0F;
+    float pressure = 1.0F;
+    std::uint32_t time_ms = 0;
+};
+
+struct StrokeSample {
+    float x = 0.0F;
+    float y = 0.0F;
+    float pressure = 1.0F;
+    float distance = 0.0F;
+};
+
+struct StrokeSamplingConfig {
+    float spacing = 1.0F;
+    bool include_endpoint = true;
+    std::size_t max_samples = max_stroke_samples;
+};
+
+[[nodiscard]] pp::foundation::Result<std::vector<StrokeSample>> sample_stroke(
+    std::span<const StrokePoint> points,
+    StrokeSamplingConfig config) noexcept;
+
+}