| // Copyright (c) 2012 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 UI_GFX_TRANSFORM_UTIL_H_ |
| #define UI_GFX_TRANSFORM_UTIL_H_ |
| |
| #include "ui/gfx/geometry/point.h" |
| #include "ui/gfx/geometry/quaternion.h" |
| #include "ui/gfx/geometry_skia_export.h" |
| #include "ui/gfx/transform.h" |
| |
| namespace gfx { |
| |
| class Point; |
| class Rect; |
| |
| // Returns a scale transform at |anchor| point. |
| GEOMETRY_SKIA_EXPORT Transform GetScaleTransform(const Point& anchor, |
| float scale); |
| |
| // Contains the components of a factored transform. These components may be |
| // blended and recomposed. |
| struct GEOMETRY_SKIA_EXPORT DecomposedTransform { |
| // The default constructor initializes the components in such a way that |
| // if used with Compose below, will produce the identity transform. |
| DecomposedTransform(); |
| |
| SkMScalar translate[3]; |
| SkMScalar scale[3]; |
| SkMScalar skew[3]; |
| SkMScalar perspective[4]; |
| Quaternion quaternion; |
| |
| std::string ToString() const; |
| |
| // Copy and assign are allowed. |
| }; |
| |
| // Interpolates the decomposed components |to| with |from| using the |
| // routines described in http://www.w3.org/TR/css3-3d-transform/. |
| // |progress| is in the range [0, 1]. If 0 we will return |from|, if 1, we will |
| // return |to|. |
| GEOMETRY_SKIA_EXPORT DecomposedTransform |
| BlendDecomposedTransforms(const DecomposedTransform& to, |
| const DecomposedTransform& from, |
| double progress); |
| |
| // Decomposes this transform into its translation, scale, skew, perspective, |
| // and rotation components following the routines detailed in this spec: |
| // http://www.w3.org/TR/css3-3d-transforms/. |
| GEOMETRY_SKIA_EXPORT bool DecomposeTransform(DecomposedTransform* out, |
| const Transform& transform); |
| |
| // Composes a transform from the given translation, scale, skew, prespective, |
| // and rotation components following the routines detailed in this spec: |
| // http://www.w3.org/TR/css3-3d-transforms/. |
| GEOMETRY_SKIA_EXPORT Transform |
| ComposeTransform(const DecomposedTransform& decomp); |
| |
| GEOMETRY_SKIA_EXPORT bool SnapTransform(Transform* out, |
| const Transform& transform, |
| const Rect& viewport); |
| |
| // Calculates a transform with a transformed origin. The resulting tranform is |
| // created by composing P * T * P^-1 where P is a constant transform to the new |
| // origin. |
| GEOMETRY_SKIA_EXPORT Transform |
| TransformAboutPivot(const gfx::Point& pivot, const gfx::Transform& transform); |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_TRANSFORM_UTIL_H_ |