1 #ifndef __DALI_UINT_16_PAIR_H__
2 #define __DALI_UINT_16_PAIR_H__
5 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
25 #include <dali/public-api/common/dali-common.h>
26 #include <dali/public-api/common/type-traits.h>
31 * @addtogroup dali_core_math
36 * @brief Simple class for passing around pairs of small unsigned integers.
38 * Use this for integer dimensions and points with limited range such as image
39 * sizes and pixel coordinates where a pair of floating point numbers is
40 * inefficient and illogical (i.e. the data is inherently integer).
41 * One of these can be passed in a single 32 bit integer register on
42 * common architectures.
48 * @brief Default constructor for the (0, 0) tuple.
50 Uint16Pair() : mData(0) {}
53 * @brief Constructor taking separate x and y (width and height) parameters.
54 * @param[in] width The width or X dimension of the tuple. Make sure it is less than 65536,
55 * @param[in] height The height or Y dimension of the tuple. Make sure it is less than 65536,
57 Uint16Pair( uint32_t width, uint32_t height )
59 DALI_ASSERT_DEBUG( width < ( 1u << 16 ) && "Width parameter not representable." );
60 DALI_ASSERT_DEBUG( height < ( 1u << 16 ) && "Height parameter not representable." );
62 /* Do equivalent of the code below with one aligned memory access:
63 * mComponents[0] = width;
64 * mComponents[1] = height;
65 * Unit tests make sure this is equivalent.
67 mData = (height << 16u) + width;
71 * @brief Copy constructor.
72 * @param rhs to copy from
74 Uint16Pair( const Uint16Pair& rhs )
80 * @brief Sets the width.
81 * @since DALi version 1.1.13
82 * @param[in] width The x dimension to be stored in this 2-tuple.
84 void SetWidth( uint16_t width )
86 mComponents[0] = width;
90 * @returns the x dimension stored in this 2-tuple.
92 uint16_t GetWidth() const
94 return mComponents[0];
98 * @brief Sets the height.
99 * @since DALi version 1.1.13
100 * @param[in] height The y dimension to be stored in this 2-tuple.
102 void SetHeight( uint16_t height )
104 mComponents[1] = height;
108 * @returns the y dimension stored in this 2-tuple.
110 uint16_t GetHeight() const
112 return mComponents[1];
116 * @brief Sets the x dimension (same as width).
117 * @since DALi version 1.1.14
118 * @param[in] x The x dimension to be stored in this 2-tuple.
120 void SetX( uint16_t x )
126 * @returns the x dimension stored in this 2-tuple.
128 uint16_t GetX() const
130 return mComponents[0];
134 * @brief Sets the y dimension (same as height).
135 * @since DALi version 1.1.14
136 * @param[in] y The y dimension to be stored in this 2-tuple.
138 void SetY( uint16_t y )
144 * @returns the y dimension stored in this 2-tuple.
146 uint16_t GetY() const
148 return mComponents[1];
152 * Assignment operator.
154 Uint16Pair& operator=( const Uint16Pair& rhs )
166 bool operator==( const Uint16Pair& rhs ) const
168 return mData == rhs.mData;
172 * Inequality operator.
174 bool operator!=( const Uint16Pair& rhs ) const
176 return mData != rhs.mData;
180 * Less than comparison operator for storing in collections (not geometrically
183 bool operator<( const Uint16Pair& rhs ) const
185 return mData < rhs.mData;
189 * Greater than comparison operator for storing in collections (not
190 * geometrically meaningful).
192 bool operator>( const Uint16Pair& rhs ) const
194 return mData > rhs.mData;
198 * @brief Create an instance by rounding a floating point vector to closest
201 * Uses a template for loose coupling, to save a header include, and allow any
202 * vector type with .x and .y members to be converted.
204 template<typename FLOAT_VECTOR_N_TYPE>
205 static Uint16Pair FromFloatVec2( const FLOAT_VECTOR_N_TYPE& from )
207 DALI_ASSERT_DEBUG( from.x + 0.5f < 65536.0f );
208 DALI_ASSERT_DEBUG( from.y + 0.5f < 65536.0f );
209 return Uint16Pair( from.x + 0.5f, from.y + 0.5f );
213 * @brief Create an instance by rounding a floating point array to closest
216 * Uses a template to allow any vector type with operator [] to be converted
217 * in addition to plain arrays.
219 template<typename FLOAT_ARRAY>
220 static Uint16Pair FromFloatArray( const FLOAT_ARRAY& from )
222 DALI_ASSERT_DEBUG( from[0] + 0.5f < 65536.0f );
223 DALI_ASSERT_DEBUG( from[1] + 0.5f < 65536.0f );
224 return Uint16Pair( from[0] + 0.5f, from[1] + 0.5f );
230 // Addressable view of X and Y:
231 uint16_t mComponents[2];
232 // Packed view of X and Y to force alignment and allow a faster copy:
237 // Allow Uint16Pair to be treated as a POD type
238 template <> struct TypeTraits< Uint16Pair > : public BasicTypes< Uint16Pair > { enum { IS_TRIVIAL_TYPE = true }; };
245 #endif // __DALI_UINT_16_PAIR_H__