gfx/src/WPFGpuRaster.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_WPF_GPU_RASTER_H
   8 #define MOZILLA_GFX_WPF_GPU_RASTER_H
   9
  10 #include <stddef.h>
  11 #include <stdint.h>
  12
  13 namespace WGR {
  14
  15 enum class FillMode { EvenOdd, Winding };
  16 struct PathBuilder;
  17 struct Point {
  18   int32_t x;
  19   int32_t y;
  20 };
  21 constexpr uint8_t PathPointTypeStart = 0;
  22 constexpr uint8_t PathPointTypeLine = 1;
  23 constexpr uint8_t PathPointTypeBezier = 3;
  24 constexpr uint8_t PathPointTypePathTypeMask = 0x07;
  25 constexpr uint8_t PathPointTypeCloseSubpath = 0x80;
  26 struct Path {
  27   FillMode fill_mode;
  28   const Point* points;
  29   size_t num_points;
  30   const uint8_t* types;
  31   size_t num_types;
  32 };
  33 struct OutputVertex {
  34   float x;
  35   float y;
  36   float coverage;
  37 };
  38 struct VertexBuffer {
  39   OutputVertex* data;
  40   size_t len;
  41 };
  42
  43 extern "C" {
  44 PathBuilder* wgr_new_builder();
  45 void wgr_builder_reset(PathBuilder* pb);
  46 void wgr_builder_move_to(PathBuilder* pb, float x, float y);
  47 void wgr_builder_line_to(PathBuilder* pb, float x, float y);
  48 void wgr_builder_curve_to(PathBuilder* pb, float c1x, float c1y, float c2x,
  49                           float c2y, float x, float y);
  50 void wgr_builder_quad_to(PathBuilder* pb, float cx, float cy, float x, float y);
  51 void wgr_builder_close(PathBuilder* pb);
  52 void wgr_builder_set_fill_mode(PathBuilder* pb, FillMode fill_mode);
  53 Path wgr_builder_get_path(PathBuilder* pb);
  54 VertexBuffer wgr_path_rasterize_to_tri_list(
  55     const Path* p, int32_t clip_x, int32_t clip_y, int32_t clip_width,
  56     int32_t clip_height, bool need_inside = true, bool need_outside = false,
  57     bool rasterization_truncates = false, OutputVertex* output_ptr = nullptr,
  58     size_t output_capacity = 0);
  59 void wgr_path_release(Path p);
  60 void wgr_vertex_buffer_release(VertexBuffer vb);
  61 void wgr_builder_release(PathBuilder* pb);
  62 };
  63
  64 }  // namespace WGR
  65
  66 #endif  // MOZILLA_GFX_WPF_GPU_RASTER_H