AggRenderer.hpp

#pragma once
 
#include "AstGlobal.h"
 
#if defined(AST_WITH_AGG)
 
A_SUPPRESS_WARNINGS_BEGIN
#include "agg/agg_basics.h"
#include "agg/agg_rendering_buffer.h"
#include "agg/agg_rasterizer_scanline_aa.h"
#include "agg/agg_scanline_p.h"
#include "agg/agg_renderer_scanline.h"
#include "agg/agg_pixfmt_rgba.h"
#include "agg/agg_path_storage.h"
#include "agg/agg_conv_stroke.h"
#include "agg/agg_conv_transform.h"
#include "agg/agg_conv_curve.h"
#include "agg/agg_conv_dash.h"
#include "agg/agg_trans_affine.h"
#include "agg/agg_color_rgba.h"
#include "agg/agg_gsv_text.h"
A_SUPPRESS_WARNINGS_END
 
#include "LineStyle.hpp"
 
 
AST_NAMESPACE_BEGIN
 
class AggRenderer {
public:
    // 像素格式: 普通 RGBA (非预乘)
    typedef agg::pixfmt_rgba32 pixfmt_type;
    typedef agg::renderer_base<pixfmt_type> renderer_base_type;
    typedef agg::renderer_scanline_aa_solid<renderer_base_type> renderer_aa_type;
    typedef agg::rasterizer_scanline_aa<> rasterizer_type;
    typedef agg::scanline_p8 scanline_type;
 
    AggRenderer(unsigned int width, unsigned int height, double dpi = 96.0);
    AggRenderer(const AggRenderer&) = delete;
    AggRenderer& operator=(const AggRenderer&) = delete;
    ~AggRenderer();
 
    unsigned int width()  const { return width_; }
    unsigned int height() const { return height_; }
    double dpi()          const { return dpi_; }
 
    void clear(const agg::rgba& bg = agg::rgba(1.0, 1.0, 1.0, 1.0));
 
    void draw_line(const double* x, const double* y, size_t n,
                   const LineStyle& style, const agg::trans_affine& trans);
 
    void draw_path(agg::path_storage& path, const LineStyle& style,
                   const agg::trans_affine& trans, bool hasFace = false);
 
    void draw_filled_rect(double x1, double y1, double x2, double y2,
                          const agg::rgba& fill_color,
                          const agg::trans_affine& trans);
 
    void draw_text(const char* text, double x, double y, double size_pt,
                   const agg::rgba& color, double angle_deg = 0.0);
 
    void draw_marker(int shape, double cx, double cy, double size_pt,
                     const agg::rgba& edge_color, const agg::rgba& fill_color,
                     double linewidth);
 
    const unsigned char* buffer() const { return pixBuffer_; }
 
    void save_bmp(const char* filename) const;
 
private:
 
    void draw_stroke_impl(/* 处理后的 path pipeline */);
 
    unsigned int width_, height_;
    double dpi_;
 
    agg::int8u* pixBuffer_{};
    agg::rendering_buffer rbuf_{};
    pixfmt_type pixFmt_{};
    renderer_base_type renBase_{};
    renderer_aa_type renAA_{};
    rasterizer_type ras_{};
    scanline_type sl_{};
};
 
 
AST_NAMESPACE_END
 
#endif // AST_WITH_AGG && AST_WITH_MATPLOT