328 lines
11 KiB
C
328 lines
11 KiB
C
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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// Copyright (c) 2008 Rene Rebe <rene@exactcode.de> [arc parser code]
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// Copyright (c) 2017 John Horigan <john@glyphic.com> [align_subpath()]
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// SVG path renderer.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_SVG_PATH_RENDERER_INCLUDED
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#define AGG_SVG_PATH_RENDERER_INCLUDED
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#include "agg_path_storage.h"
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#include "agg_conv_transform.h"
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#include "agg_conv_stroke.h"
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#include "agg_conv_contour.h"
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#include "agg_conv_curve.h"
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#include "agg_color_rgba.h"
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#include "agg_renderer_scanline.h"
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#include "agg_bounding_rect.h"
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#include "agg_rasterizer_scanline_aa.h"
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#include "agg_svg_path_tokenizer.h"
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namespace agg
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{
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namespace svg
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{
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template<class VertexSource> class conv_count
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{
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public:
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conv_count(VertexSource& vs) : m_source(&vs), m_count(0) {}
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void count(unsigned n) { m_count = n; }
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unsigned count() const { return m_count; }
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void rewind(unsigned path_id) { m_source->rewind(path_id); }
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unsigned vertex(double* x, double* y)
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{
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++m_count;
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return m_source->vertex(x, y);
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}
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private:
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VertexSource* m_source;
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unsigned m_count;
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};
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//============================================================================
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// Basic path attributes
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struct path_attributes
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{
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unsigned index;
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rgba8 fill_color;
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rgba8 stroke_color;
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bool fill_flag;
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bool stroke_flag;
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bool even_odd_flag;
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line_join_e line_join;
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line_cap_e line_cap;
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double miter_limit;
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double stroke_width;
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trans_affine transform;
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// Empty constructor
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path_attributes() :
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index(0),
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fill_color(rgba(0,0,0)),
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stroke_color(rgba(0,0,0)),
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fill_flag(true),
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stroke_flag(false),
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even_odd_flag(false),
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line_join(miter_join),
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line_cap(butt_cap),
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miter_limit(4.0),
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stroke_width(1.0),
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transform()
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{
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}
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// Copy constructor
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path_attributes(const path_attributes& attr) :
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index(attr.index),
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fill_color(attr.fill_color),
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stroke_color(attr.stroke_color),
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fill_flag(attr.fill_flag),
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stroke_flag(attr.stroke_flag),
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even_odd_flag(attr.even_odd_flag),
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line_join(attr.line_join),
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line_cap(attr.line_cap),
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miter_limit(attr.miter_limit),
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stroke_width(attr.stroke_width),
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transform(attr.transform)
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{
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}
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// Copy constructor with new index value
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path_attributes(const path_attributes& attr, unsigned idx) :
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index(idx),
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fill_color(attr.fill_color),
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stroke_color(attr.stroke_color),
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fill_flag(attr.fill_flag),
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stroke_flag(attr.stroke_flag),
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even_odd_flag(attr.even_odd_flag),
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line_join(attr.line_join),
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line_cap(attr.line_cap),
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miter_limit(attr.miter_limit),
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stroke_width(attr.stroke_width),
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transform(attr.transform)
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{
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}
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};
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//============================================================================
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// Path container and renderer.
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class path_renderer
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{
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public:
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typedef pod_bvector<path_attributes> attr_storage;
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typedef conv_curve<path_storage> curved;
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typedef conv_count<curved> curved_count;
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typedef conv_stroke<curved_count> curved_stroked;
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typedef conv_transform<curved_stroked> curved_stroked_trans;
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typedef conv_transform<curved_count> curved_trans;
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typedef conv_contour<curved_trans> curved_trans_contour;
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path_renderer();
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void remove_all();
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// Use these functions as follows:
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// begin_path() when the XML tag <path> comes ("start_element" handler)
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// parse_path() on "d=" tag attribute
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// end_path() when parsing of the entire tag is done.
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void begin_path();
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void parse_path(path_tokenizer& tok);
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void end_path();
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// The following functions are essentially a "reflection" of
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// the respective SVG path commands.
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void move_to(double x, double y, bool rel=false); // M, m
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void line_to(double x, double y, bool rel=false); // L, l
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void hline_to(double x, bool rel=false); // H, h
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void vline_to(double y, bool rel=false); // V, v
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void curve3(double x1, double y1, // Q, q
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double x, double y, bool rel=false);
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void curve3(double x, double y, bool rel=false); // T, t
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void curve4(double x1, double y1, // C, c
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double x2, double y2,
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double x, double y, bool rel=false);
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void curve4(double x2, double y2, // S, s
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double x, double y, bool rel=false);
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void arc(double rx, double ry, double angle, // A, a
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bool large_arc_flag, bool sweep_flag, double x, double y,
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bool rel=false);
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void close_subpath(); // Z, z
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void align_subpath(unsigned start_idx);
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// template<class VertexSource>
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// void add_path(VertexSource& vs,
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// unsigned path_id = 0,
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// bool solid_path = true)
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// {
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// m_storage.add_path(vs, path_id, solid_path);
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// }
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unsigned vertex_count() const { return m_curved_count.count(); }
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// Call these functions on <g> tag (start_element, end_element respectively)
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void push_attr();
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void pop_attr();
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// Attribute setting functions.
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void fill(const rgba8& f);
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void stroke(const rgba8& s);
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void even_odd(bool flag);
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void stroke_width(double w);
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void fill_none();
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void stroke_none();
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void fill_opacity(double op);
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void stroke_opacity(double op);
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void line_join(line_join_e join);
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void line_cap(line_cap_e cap);
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void miter_limit(double ml);
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trans_affine& transform();
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// Make all polygons CCW-oriented
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void arrange_orientations()
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{
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m_storage.arrange_orientations_all_paths(path_flags_ccw);
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}
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// Expand all polygons
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void expand(double value)
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{
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m_curved_trans_contour.width(value);
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}
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unsigned operator [](unsigned idx)
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{
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m_transform = m_attr_storage[idx].transform;
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return m_attr_storage[idx].index;
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}
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void bounding_rect(double* x1, double* y1, double* x2, double* y2)
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{
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agg::conv_transform<agg::path_storage> trans(m_storage, m_transform);
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agg::bounding_rect(trans, *this, 0, m_attr_storage.size(), x1, y1, x2, y2);
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}
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// Rendering. One can specify two additional parameters:
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// trans_affine and opacity. They can be used to transform the whole
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// image and/or to make it translucent.
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template<class Rasterizer, class Scanline, class Renderer>
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void render(Rasterizer& ras,
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Scanline& sl,
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Renderer& ren,
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const trans_affine& mtx,
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const rect_i& cb,
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double opacity=1.0)
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{
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unsigned i;
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ras.clip_box(cb.x1, cb.y1, cb.x2, cb.y2);
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m_curved_count.count(0);
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for(i = 0; i < m_attr_storage.size(); i++)
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{
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const path_attributes& attr = m_attr_storage[i];
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m_transform = attr.transform;
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m_transform *= mtx;
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double scl = m_transform.scale();
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//m_curved.approximation_method(curve_inc);
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m_curved.approximation_scale(scl);
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m_curved.angle_tolerance(0.0);
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rgba8 color;
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if(attr.fill_flag)
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{
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ras.reset();
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ras.filling_rule(attr.even_odd_flag ? fill_even_odd : fill_non_zero);
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if(fabs(m_curved_trans_contour.width()) < 0.0001)
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{
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ras.add_path(m_curved_trans, attr.index);
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}
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else
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{
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m_curved_trans_contour.miter_limit(attr.miter_limit);
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ras.add_path(m_curved_trans_contour, attr.index);
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}
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color = attr.fill_color;
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color.opacity(color.opacity() * opacity);
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ren.color(color);
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agg::render_scanlines(ras, sl, ren);
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}
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if(attr.stroke_flag)
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{
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m_curved_stroked.width(attr.stroke_width);
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//m_curved_stroked.line_join((attr.line_join == miter_join) ? miter_join_round : attr.line_join);
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m_curved_stroked.line_join(attr.line_join);
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m_curved_stroked.line_cap(attr.line_cap);
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m_curved_stroked.miter_limit(attr.miter_limit);
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m_curved_stroked.inner_join(inner_round);
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m_curved_stroked.approximation_scale(scl);
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// If the *visual* line width is considerable we
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// turn on processing of curve cusps.
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//---------------------
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if(attr.stroke_width * scl > 1.0)
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{
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m_curved.angle_tolerance(0.2);
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}
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ras.reset();
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ras.filling_rule(fill_non_zero);
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ras.add_path(m_curved_stroked_trans, attr.index);
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color = attr.stroke_color;
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color.opacity(color.opacity() * opacity);
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ren.color(color);
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agg::render_scanlines(ras, sl, ren);
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}
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}
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}
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private:
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path_attributes& cur_attr();
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path_storage m_storage;
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attr_storage m_attr_storage;
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attr_storage m_attr_stack;
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trans_affine m_transform;
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curved m_curved;
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curved_count m_curved_count;
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curved_stroked m_curved_stroked;
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curved_stroked_trans m_curved_stroked_trans;
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curved_trans m_curved_trans;
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curved_trans_contour m_curved_trans_contour;
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};
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}
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}
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#endif
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