PixelPaint: Expose more complex selection operations

Now that we use RectMask internally to store the selection, we can
expose more powerful APIs to allow for better control over the image
selection.

1 files changed, 16 insertions, 1 deletions

diff --git a/Userland/Applications/PixelPaint/Selection.h b/Userland/Applications/PixelPaint/Selection.h
index f521421f7f..4080b9c09e 100644
--- a/Userland/Applications/PixelPaint/Selection.h
+++ b/Userland/Applications/PixelPaint/Selection.h
@@ -18,13 +18,28 @@ class ImageEditor;
 // Coordinates are image-relative.
 class Selection {
 public:
+    enum class MergeMode {
+        Set,
+        Add,
+        Subtract,
+        Intersect,
+        __Count,
+    };
+
     explicit Selection(ImageEditor&);
 
     bool is_empty() const { return m_mask.is_null(); }
     void clear();
-    void set(Gfx::IntRect const& rect) { m_mask = Mask::full(rect); }
+    void merge(Mask const&, MergeMode);
+    void merge(Gfx::IntRect const& rect, MergeMode mode) { merge(Mask::full(rect), mode); }
     Gfx::IntRect bounding_rect() const { return m_mask.bounding_rect(); }
 
+    [[nodiscard]] bool is_selected(int x, int y) const { return m_mask.get(x, y) > 0; }
+    [[nodiscard]] bool is_selected(Gfx::IntPoint const& point) const { return is_selected(point.x(), point.y()); }
+
+    [[nodiscard]] u8 get_selection_alpha(int x, int y) const { return m_mask.get(x, y); }
+    [[nodiscard]] u8 get_selection_alpha(Gfx::IntPoint const& point) const { return get_selection_alpha(point.x(), point.y()); }
+
     void paint(Gfx::Painter&);
 
     void draw_marching_ants(Gfx::Painter&, Gfx::IntRect const&) const;