Added the bulk of the algorithm for GPU accelerated 2D vector curve...

core/cross/processed_path.h

+/*
+ * Copyright 2010, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef O3D_CORE_CROSS_PROCESSED_PATH_H_
+#define O3D_CORE_CROSS_PROCESSED_PATH_H_
+
+#include "core/cross/object_base.h"
+#include "core/cross/gpu2d/path_cache.h"
+#include "third_party/skia/include/core/SkPath.h"
+
+namespace o3d {
+
+class Field;
+
+// This class is the link between the generic curve processing code in
+// this directory and O3D. It runs the PathProcessor on a set of
+// curves and returns the resulting triangles' vertices and texture
+// coordinates in Fields which can be incorporated into primitives in
+// the scene graph.
+class ProcessedPath : public ObjectBase {
+ public:
+  typedef SmartPointer<ProcessedPath> Ref;
+
+  virtual ~ProcessedPath();
+
+  // Clears out all of the curve segments that have been added to this
+  // path.
+  void Clear();
+
+  // Moves the pen to the given absolute X,Y coordinates. If a contour
+  // isn't currently open on this path, one is opened.
+  void MoveTo(float x, float y);
+
+  // Draws a line from the current coordinates to the given absolute
+  // X,Y coordinates.
+  void LineTo(float x, float y);
+
+  // Draws a quadratic curve from the current coordinates through the
+  // given control point and end point, specified in absolute
+  // coordinates.
+  void QuadraticTo(float cx, float cy, float x, float y);
+
+  // Draws a cubic curve from the current coordinates through the
+  // given control points and end point, specified in absolute
+  // coordinates.
+  void CubicTo(float c0x, float c0y,
+               float c1x, float c1y,
+               float x, float y);
+
+  // Closes the currently open contour on this path.
+  void Close();
+
+  // Creates the triangle mesh which will render the given curve
+  // segments. There are two regions: exterior and interior. The
+  // exterior region covers the portions containing the curve
+  // segments. It has two associated fields: a 2D floating point field
+  // for the positions, and a 3D floating point field for the
+  // Loop/Blinn texture coordinates. The interior region has one 2D
+  // floating point field for the positions. The contents of the
+  // fields are organized for rendering as non-indexed triangles.
+  void CreateMesh(Field* exterior_positions,
+                  Field* exterior_texture_coordinates,
+                  Field* interior_positions);
+
+ private:
+  explicit ProcessedPath(ServiceLocator* service_locator);
+
+  void SetFields(const float* positions,
+                 Field* position_field,
+                 const float* texture_coordinates,
+                 Field* texture_coordinate_field,
+                 unsigned int num_vertices);
+
+  friend class IClassManager;
+  static ObjectBase::Ref Create(ServiceLocator* service_locator);
+
+  SkPath path;
+  gpu2d::PathCache cache;
+
+  O3D_DECL_CLASS(ProcessedPath, ObjectBase);
+  DISALLOW_COPY_AND_ASSIGN(ProcessedPath);
+};
+
+}  // namespace o3d
+
+#endif  // O3D_CORE_CROSS_PROCESSED_PATH_H_
+