1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_GFX_TRANSFORM_UTIL_H_ 6 #define UI_GFX_TRANSFORM_UTIL_H_ 7 8 #include "ui/base/ui_export.h" 9 #include "ui/gfx/transform.h" 10 11 namespace gfx { 12 13 class Point; 14 15 // Returns a scale transform at |anchor| point. 16 UI_EXPORT Transform GetScaleTransform(const Point& anchor, float scale); 17 18 // Contains the components of a factored transform. These components may be 19 // blended and recomposed. 20 struct UI_EXPORT DecomposedTransform { 21 // The default constructor initializes the components in such a way that 22 // if used with Compose below, will produce the identity transform. 23 DecomposedTransform(); 24 25 double translate[3]; 26 double scale[3]; 27 double skew[3]; 28 double perspective[4]; 29 double quaternion[4]; 30 31 // Copy and assign are allowed. 32 }; 33 34 // Interpolates the decomposed components |to| with |from| using the 35 // routines described in http://www.w3.org/TR/css3-3d-transform/. 36 // |progress| is in the range [0, 1] (0 leaves |out| unchanged, and 1 37 // assigns |from| to |out|). 38 UI_EXPORT bool BlendDecomposedTransforms(DecomposedTransform* out, 39 const DecomposedTransform& to, 40 const DecomposedTransform& from, 41 double progress); 42 43 // Decomposes this transform into its translation, scale, skew, perspective, 44 // and rotation components following the routines detailed in this spec: 45 // http://www.w3.org/TR/css3-3d-transforms/. 46 UI_EXPORT bool DecomposeTransform(DecomposedTransform* out, 47 const Transform& transform); 48 49 // Composes a transform from the given translation, scale, skew, prespective, 50 // and rotation components following the routines detailed in this spec: 51 // http://www.w3.org/TR/css3-3d-transforms/. 52 UI_EXPORT Transform ComposeTransform(const DecomposedTransform& decomp); 53 54 } // namespace gfx 55 56 #endif // UI_GFX_TRANSFORM_UTIL_H_ 57
