1 #ifndef DALI_UINT_16_PAIR_H
2 #define DALI_UINT_16_PAIR_H
5 * Copyright (c) 2020 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.
49 * @brief Default constructor for the (0, 0) tuple.
52 Uint16Pair() : mData(0) {}
55 * @brief Constructor taking separate x and y (width and height) parameters.
57 * @param[in] width The width or X dimension of the tuple. Make sure it is less than 65536
58 * @param[in] height The height or Y dimension of the tuple. Make sure it is less than 65536
60 Uint16Pair( uint32_t width, uint32_t height )
62 DALI_ASSERT_DEBUG( width < ( 1u << 16 ) && "Width parameter not representable." );
63 DALI_ASSERT_DEBUG( height < ( 1u << 16 ) && "Height parameter not representable." );
65 /* Do equivalent of the code below with one aligned memory access:
66 * mComponents[0] = width;
67 * mComponents[1] = height;
68 * Unit tests make sure this is equivalent.
70 mData = (height << 16u) + width;
74 * @brief Sets the width.
76 * @param[in] width The x dimension to be stored in this 2-tuple
78 void SetWidth( uint16_t width )
80 mComponents[0] = width;
84 * @brief Get the width.
86 * @return the x dimension stored in this 2-tuple
88 uint16_t GetWidth() const
90 return mComponents[0];
94 * @brief Sets the height.
96 * @param[in] height The y dimension to be stored in this 2-tuple
98 void SetHeight( uint16_t height )
100 mComponents[1] = height;
104 * @brief Returns the y dimension stored in this 2-tuple.
108 uint16_t GetHeight() const
110 return mComponents[1];
114 * @brief Sets the x dimension (same as width).
116 * @param[in] x The x dimension to be stored in this 2-tuple
118 void SetX( uint16_t x )
124 * @brief 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).
136 * @param[in] y The y dimension to be stored in this 2-tuple
138 void SetY( uint16_t y )
144 * @brief Returns the y dimension stored in this 2-tuple.
148 uint16_t GetY() const
150 return mComponents[1];
154 * @brief Equality operator.
156 * @param[in] rhs A reference for comparison
157 * @return True if same
159 bool operator==( const Uint16Pair& rhs ) const
161 return mData == rhs.mData;
165 * @brief Inequality operator.
167 * @param[in] rhs A reference for comparison
168 * @return True if different
170 bool operator!=( const Uint16Pair& rhs ) const
172 return mData != rhs.mData;
176 * @brief Less than comparison operator for storing in collections (not geometrically
179 * @param[in] rhs A reference for comparison
180 * @return True if less
182 bool operator<( const Uint16Pair& rhs ) const
184 return mData < rhs.mData;
188 * @brief Greater than comparison operator for storing in collections (not
189 * geometrically meaningful).
191 * @param[in] rhs A reference for comparison
192 * @return True if greater
194 bool operator>( const Uint16Pair& rhs ) const
196 return mData > rhs.mData;
200 * @brief Creates an instance by rounding a floating point vector to closest
203 * Uses a template for loose coupling, to save a header include, and allow any
204 * vector type with .x and .y members to be converted.
206 * @param[in] from Floating point vector2
207 * @return Closest integer value
209 template<typename FLOAT_VECTOR_N_TYPE>
210 static Uint16Pair FromFloatVec2( const FLOAT_VECTOR_N_TYPE& from )
212 DALI_ASSERT_DEBUG( from.x + 0.5f < 65536.0f );
213 DALI_ASSERT_DEBUG( from.y + 0.5f < 65536.0f );
214 return Uint16Pair( from.x + 0.5f, from.y + 0.5f );
218 * @brief Creates an instance by rounding a floating point array to closest
221 * Uses a template to allow any vector type with operator [] to be converted
222 * in addition to plain arrays.
224 * @param[in] from Floating point array
225 * @return Closest integer value
227 template<typename FLOAT_ARRAY>
228 static Uint16Pair FromFloatArray( const FLOAT_ARRAY& from )
230 DALI_ASSERT_DEBUG( from[0] + 0.5f < 65536.0f );
231 DALI_ASSERT_DEBUG( from[1] + 0.5f < 65536.0f );
232 return Uint16Pair( from[0] + 0.5f, from[1] + 0.5f );
237 Uint16Pair( const Uint16Pair& ) = default; ///< Default copy constructor
238 Uint16Pair( Uint16Pair&& ) = default; ///< Default move constructor
239 Uint16Pair& operator=( const Uint16Pair& ) = default; ///< Default copy assignment operator
240 Uint16Pair& operator=( Uint16Pair&& ) = default; ///< Default move assignment operator
245 // Addressable view of X and Y:
246 uint16_t mComponents[2];
247 // Packed view of X and Y to force alignment and allow a faster copy:
252 // Allow Uint16Pair to be treated as a POD type
253 template <> struct TypeTraits< Uint16Pair > : public BasicTypes< Uint16Pair > { enum { IS_TRIVIAL_TYPE = true }; };
260 #endif // DALI_UINT_16_PAIR_H