canvas_overlay.h

#pragma once
 
#include <cgv/gui/theme_info.h>
#include <cgv/render/managed_frame_buffer.h>
#include <cgv_g2d/canvas.h>
#include <cgv_g2d/shape2d_styles.h>
#include <cgv_overlay/overlay.h>
 
#include "lib_begin.h"
 
namespace cgv {
namespace overlay {
 
class CGV_API canvas_overlay : public overlay {
private:
    bool has_damage_ = true;
    bool recreate_layout_requested_ = true;
    
    cgv::g2d::shape2d_style blit_style_;
 
    cgv::render::managed_frame_buffer frame_buffer_;
 
protected:
    cgv::g2d::canvas overlay_canvas, content_canvas;
    bool draw_in_finish_frame = false;
    bool ensure_layout(cgv::render::context& ctx);
 
    void post_recreate_layout();
 
    void clear_damage();
 
    bool is_damaged() const;
 
    void begin_content(cgv::render::context& ctx, bool clear_frame_buffer = true);
    
    void end_content(cgv::render::context& ctx, bool keep_damage = false);
 
    virtual void draw_impl(cgv::render::context& ctx);
 
    virtual void init_styles() {}
 
    void register_shader(const std::string& name, const std::string& filename);
 
public:
    canvas_overlay();
    bool init(cgv::render::context& ctx) override;
    void clear(cgv::render::context& ctx) override;
    void set_draw_in_finish_frame(bool enable = true);
    virtual void on_set(void* member_ptr) override;
    virtual void handle_member_change(cgv::data::informed_ptr ptr) override {}
    void finish_frame(cgv::render::context&) override;
    void after_finish(cgv::render::context&) override;
    virtual void draw_content(cgv::render::context& ctx) = 0;
 
    void post_damage(bool redraw = true);
 
    ivec2 get_local_mouse_pos(ivec2 mouse_pos) const override;
 
    bool is_hit(const ivec2& mouse_pos) const override;
 
    bool is_hit_local(const ivec2& local_mouse_pos) const;
};
 
typedef cgv::data::ref_ptr<canvas_overlay> canvas_overlay_ptr;
 
} // namespace overlay
} // namespace cgv
 
#include <cgv/config/lib_end.h>