gfx/src/AAStroke.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef MOZILLA_GFX_AA_STROKE_H
   8 #define MOZILLA_GFX_AA_STROKE_H
   9
  10 #include <stddef.h>
  11
  12 namespace AAStroke {
  13
  14 enum class LineCap { Round, Square, Butt };
  15 enum class LineJoin { Round, Miter, Bevel };
  16 struct StrokeStyle {
  17   float width;
  18   LineCap cap;
  19   LineJoin join;
  20   float miter_limit;
  21 };
  22 struct Stroker;
  23 struct OutputVertex {
  24   float x;
  25   float y;
  26   float coverage;
  27 };
  28 struct VertexBuffer {
  29   OutputVertex* data;
  30   size_t len;
  31 };
  32
  33 extern "C" {
  34 Stroker* aa_stroke_new(const StrokeStyle* style,
  35                        OutputVertex* output_ptr = nullptr,
  36                        size_t output_capacity = 0);
  37 void aa_stroke_move_to(Stroker* s, float x, float y, bool closed);
  38 void aa_stroke_line_to(Stroker* s, float x, float y, bool end);
  39 void aa_stroke_curve_to(Stroker* s, float c1x, float c1y, float c2x, float c2y,
  40                         float x, float y, bool end);
  41 void aa_stroke_close(Stroker* s);
  42 VertexBuffer aa_stroke_finish(Stroker* s);
  43 VertexBuffer aa_stroke_filled_circle(float cx, float cy, float radius,
  44                                      OutputVertex* output_ptr = nullptr,
  45                                      size_t output_capacity = 0);
  46 void aa_stroke_vertex_buffer_release(VertexBuffer vb);
  47 void aa_stroke_release(Stroker* s);
  48 };
  49
  50 }  // namespace AAStroke
  51
  52 #endif  // MOZILLA_GFX_AA_STROKE_H