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>
30 * @addtogroup dali_core_math
35 * @brief Simple class for passing around pairs of small unsigned integers.
37 * Use this for integer dimensions and points with limited range such as image
38 * sizes and pixel coordinates where a pair of floating point numbers is
39 * inefficient and illogical (i.e. the data is inherently integer).
40 * These are immutable. If you want to change a value, make a whole new object.
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) vector.
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 vector. Make sure it is less than 65536,
58 * @param[in] height The height or Y dimension of the vector. 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 Copy constructor.
76 * @param[in] rhs A reference to the copied Uint16Pair
78 Uint16Pair( const Uint16Pair& rhs )
84 * @brief @returns the x dimension stored in this 2-tuple.
87 uint16_t GetWidth() const
89 return mComponents[0];
93 * @brief Returns the y dimension stored in this 2-tuple.
97 uint16_t GetHeight() const
99 return mComponents[1];
103 * @brief Returns the x dimension stored in this 2-tuple.
107 uint16_t GetX() const
109 return mComponents[0];
113 * @brief Returns the y dimension stored in this 2-tuple.
117 uint16_t GetY() const
119 return mComponents[1];
123 * @brief Equality operator.
125 * @param[i] rhs A reference for comparison
126 * @return True if same
128 bool operator==( const Uint16Pair& rhs ) const
130 return mData == rhs.mData;
134 * @brief Inequality operator.
136 * @param[i] rhs A reference for comparison
137 * @return True if different
139 bool operator!=( const Uint16Pair& rhs ) const
141 return mData != rhs.mData;
145 * @brief Less than comparison operator for storing in collections (not geometrically
148 * @param[i] rhs A reference for comparison
149 * @return True if less
151 bool operator<( const Uint16Pair& rhs ) const
153 return mData < rhs.mData;
157 * @brief Greater than comparison operator for storing in collections (not
158 * geometrically meaningful).
160 * @param[i] rhs A reference for comparison
161 * @return True if greater
163 bool operator>( const Uint16Pair& rhs ) const
165 return mData > rhs.mData;
169 * @brief Create an instance by rounding a floating point vector to closest
172 * Uses a template for loose coupling, to save a header include, and allow any
173 * vector type with .x and .y members to be converted.
175 * @param[in] from Floating point vector2
176 * @return Closest integer value.
178 template<typename FLOAT_VECTOR_N_TYPE>
179 static Uint16Pair FromFloatVec2( const FLOAT_VECTOR_N_TYPE& from )
181 DALI_ASSERT_DEBUG( from.x + 0.5f < 65536.0f );
182 DALI_ASSERT_DEBUG( from.y + 0.5f < 65536.0f );
183 return Uint16Pair( from.x + 0.5f, from.y + 0.5f );
187 * @brief Create an instance by rounding a floating point array to closest
190 * Uses a template to allow any vector type with operator [] to be converted
191 * in addition to plain arrays.
193 * @param[in] from Floating point array
194 * @return Closest integer value.
196 template<typename FLOAT_ARRAY>
197 static Uint16Pair FromFloatArray( const FLOAT_ARRAY& from )
199 DALI_ASSERT_DEBUG( from[0] + 0.5f < 65536.0f );
200 DALI_ASSERT_DEBUG( from[1] + 0.5f < 65536.0f );
201 return Uint16Pair( from[0] + 0.5f, from[1] + 0.5f );
207 // Addressable view of X and Y:
208 uint16_t mComponents[2];
209 // Packed view of X and Y to force alignment and allow a faster copy:
219 #endif // __DALI_UINT_16_PAIR_H__