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Unified Diff: cc/quads/draw_polygon.h

Issue 411793002: DrawPolygon class with Unit Tests (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Added CC_EXPORT to DrawPolygon, fixed gyp/build issues. Created 6 years, 5 months ago
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Index: cc/quads/draw_polygon.h
diff --git a/cc/quads/draw_polygon.h b/cc/quads/draw_polygon.h
new file mode 100644
index 0000000000000000000000000000000000000000..c4dfa13908082a8c4c6dfe64d7b6d672deb75b4b
--- /dev/null
+++ b/cc/quads/draw_polygon.h
@@ -0,0 +1,77 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_QUADS_DRAW_POLYGON_H_
+#define CC_QUADS_DRAW_POLYGON_H_
+
+#include <vector>
+
+#include "cc/base/math_util.h"
+#include "cc/output/bsp_compare_result.h"
+#include "cc/quads/draw_quad.h"
+#include "ui/gfx/point3_f.h"
+#include "ui/gfx/quad_f.h"
+#include "ui/gfx/vector3d_f.h"
+
+namespace cc {
+
+class CC_EXPORT DrawPolygon {
+ public:
+ DrawPolygon();
+ ~DrawPolygon();
+
+ DrawPolygon(DrawQuad* original_ref,
+ const std::vector<gfx::Point3F>& in_points,
+ const gfx::Vector3dF& normal,
+ int draw_order_index = 0);
+
+ // Split takes this DrawPolygon and splits it into two pieces that are on
+ // either side of |splitter|. Any edges of this polygon that cross the plane
+ // of |splitter| will have an intersection point that is shared by both
+ // polygons on either side.
+ // Split will only return true if it determines that we got back 2
+ // intersection points. Only when it returns true will front and back both be
+ // valid new polygons that are on opposite sides of the splitting plane.
+ bool Split(const DrawPolygon& splitter,
+ scoped_ptr<DrawPolygon>* front,
+ scoped_ptr<DrawPolygon>* back);
+ float SignedPointDistance(const gfx::Point3F& point) const;
+ // Checks polygon a against polygon b and returns which side it lies on, or
+ // whether it crosses (necessitating a split in the BSP tree).
+ static BspCompareResult SideCompare(const DrawPolygon& a,
+ const DrawPolygon& b);
+ void ToQuads2D(std::vector<gfx::QuadF>* quads) const;
+ void TransformToScreenSpace(const gfx::Transform& transform);
+ void TransformToLayerSpace(const gfx::Transform& inverse_transform);
+
+ const std::vector<gfx::Point3F>& points() const { return points_; }
+ const gfx::Vector3dF& normal() const { return normal_; }
+ const DrawQuad* original_ref() const { return original_ref_; }
+ int order_index() const { return order_index_; }
+
+ scoped_ptr<DrawPolygon> CreateCopy();
+
+ static gfx::Vector3dF default_normal;
+
+ private:
+ void ApplyTransform(const gfx::Transform& transform);
+ void ApplyTransformToNormal(const gfx::Transform& transform);
+
+ std::vector<gfx::Point3F> points_;
+ // Normalized, necessitated by distance calculations and tests of coplanarity.
+ gfx::Vector3dF normal_;
+ // This is an index that can be used to test whether a quad comes before or
+ // after another in document order, useful for tie-breaking when it comes
+ // to coplanar surfaces.
+ int order_index_;
+ // The pointer to the original quad, which gives us all the drawing info
+ // we need.
+ // This DrawQuad is owned by the caller and its lifetime must be preserved
+ // as long as this DrawPolygon is alive.
+ DrawQuad* original_ref_;
+};
+
+} // namespace cc
+
+#endif // CC_QUADS_DRAW_POLYGON_H_
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