Files
Alvin/include/alvin/vision.hpp
T
Aeth3randClaude Opus 5.5 ca7e62ac8d Add Alvin library: input, capture, windows and vision
A cross-platform C++23 library with a platform-neutral public API and
runtime-selected backends:

- Input: Wayland virtual pointer/keyboard (Hyprland, wlroots), libei via
  the RemoteDesktop portal (GNOME, KDE), uinput, and Win32 SendInput
- Capture: ScreenCast portal + PipeWire, and Win32 GDI
- Windows: Hyprland IPC and Win32 enumeration
- Monitors via wl_output/xdg-output and EnumDisplayMonitors
- Optional OpenCV template matching (alvin::vision)

Also adds the `alvin` CLI, Catch2 unit tests, install rules with
find_package(Alvin) support, API docs (docs/API.md and the Obsidian
vault), and README instructions for both ways of consuming the library.

Windows backends are written but not yet compiled.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-27 13:58:20 -04:00

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#pragma once
// Optional OpenCV integration (link alvin::vision).
#include <filesystem>
#include <optional>
#include <vector>
#include <opencv2/core.hpp>
#include "alvin/error.hpp"
#include "alvin/frame.hpp"
namespace alvin::vision {
// Zero-copy CV_8UC4 (BGRA) view. The Frame must outlive the Mat.
cv::Mat view(const Frame& frame);
// Deep copy converted to CV_8UC3 (BGR), the layout most OpenCV code expects.
cv::Mat toBgr(const Frame& frame);
Result<Frame> fromMat(const cv::Mat& mat);
Result<cv::Mat> loadImage(const std::filesystem::path& path); // BGR
Status saveImage(const Frame& frame, const std::filesystem::path& path); // png/jpg/...
struct Match {
Rect rect; // in frame pixels
double score = 0; // 0..1, higher is better
};
struct MatchOptions {
double threshold = 0.9;
bool grayscale = false; // faster, ignores colour differences
int maxResults = 16; // findAll only
};
// Normalised cross-correlation template matching.
Result<std::optional<Match>> find(const Frame& haystack, const cv::Mat& needle, const MatchOptions& opts = {});
Result<std::vector<Match>> findAll(const Frame& haystack, const cv::Mat& needle, const MatchOptions& opts = {});
} // namespace alvin::vision