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https://github.com/RGBCube/serenity
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SharedGraphics: Give painter a state stack and save()/restore() operations.
This will make some painting code a lot less confusing since there's no need to manually undo translations, clips, etc.
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2 changed files with 72 additions and 59 deletions
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@ -39,34 +39,44 @@ public:
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void draw_text(const Rect&, const String&, TextAlignment = TextAlignment::TopLeft, Color = Color());
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void draw_glyph(const Point&, char, Color);
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const Font& font() const { return *m_font; }
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void set_font(const Font& font) { m_font = &font; }
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const Font& font() const { return *state().font; }
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void set_font(const Font& font) { state().font = &font; }
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enum class DrawOp { Copy, Xor };
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void set_draw_op(DrawOp op) { m_draw_op = op; }
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DrawOp draw_op() const { return m_draw_op; }
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void set_draw_op(DrawOp op) { state().draw_op = op; }
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DrawOp draw_op() const { return state().draw_op; }
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void set_clip_rect(const Rect& rect);
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void clear_clip_rect();
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Rect clip_rect() const { return m_clip_rect; }
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Rect clip_rect() const { return state().clip_rect; }
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void translate(int dx, int dy) { m_translation.move_by(dx, dy); }
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void translate(const Point& delta) { m_translation.move_by(delta); }
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void translate(int dx, int dy) { state().translation.move_by(dx, dy); }
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void translate(const Point& delta) { state().translation.move_by(delta); }
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Point translation() const { return m_translation; }
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Point translation() const { return state().translation; }
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GraphicsBitmap* target() { return m_target.ptr(); }
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void save() { m_state_stack.append(m_state_stack.last()); }
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void restore() { ASSERT(m_state_stack.size() > 1); m_state_stack.take_last(); }
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private:
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void set_pixel_with_draw_op(dword& pixel, const Color&);
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void fill_rect_with_draw_op(const Rect&, Color);
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void blit_with_alpha(const Point&, const GraphicsBitmap&, const Rect& src_rect);
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const Font* m_font;
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Point m_translation;
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Rect m_clip_rect;
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struct State {
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const Font* font;
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Point translation;
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Rect clip_rect;
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DrawOp draw_op;
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};
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State& state() { return m_state_stack.last(); }
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const State& state() const { return m_state_stack.last(); }
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Rect m_clip_origin;
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GWindow* m_window { nullptr };
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Retained<GraphicsBitmap> m_target;
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DrawOp m_draw_op { DrawOp::Copy };
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Vector<State> m_state_stack;
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};
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