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 * These are immutable. If you want to change a value, make a whole new object.
42 * One of these can be passed in a single 32 bit integer register on
43 * common architectures.
49 * @brief Default constructor for the (0, 0) vector.
51 Uint16Pair() : mData(0) {}
54 * @brief Constructor taking separate x and y (width and height) parameters.
55 * @param[in] width The width or X dimension of the vector. Make sure it is less than 65536,
56 * @param[in] height The height or Y dimension of the vector. Make sure it is less than 65536,
58 Uint16Pair( uint32_t width, uint32_t height )
60 DALI_ASSERT_DEBUG( width < ( 1u << 16 ) && "Width parameter not representable." );
61 DALI_ASSERT_DEBUG( height < ( 1u << 16 ) && "Height parameter not representable." );
63 /* Do equivalent of the code below with one aligned memory access:
64 * mComponents[0] = width;
65 * mComponents[1] = height;
66 * Unit tests make sure this is equivalent.
68 mData = (height << 16u) + width;
72 * @brief Copy constructor.
74 Uint16Pair( const Uint16Pair& rhs )
80 * @returns the x dimension stored in this 2-tuple.
82 uint16_t GetWidth() const
84 return mComponents[0];
88 * @returns the y dimension stored in this 2-tuple.
90 uint16_t GetHeight() const
92 return mComponents[1];
96 * @returns the x dimension stored in this 2-tuple.
100 return mComponents[0];
104 * @returns the y dimension stored in this 2-tuple.
106 uint16_t GetY() const
108 return mComponents[1];
114 bool operator==( const Uint16Pair& rhs ) const
116 return mData == rhs.mData;
120 * Inequality operator.
122 bool operator!=( const Uint16Pair& rhs ) const
124 return mData != rhs.mData;
128 * Less than comparison operator for storing in collections (not geometrically
131 bool operator<( const Uint16Pair& rhs ) const
133 return mData < rhs.mData;
137 * Greater than comparison operator for storing in collections (not
138 * geometrically meaningful).
140 bool operator>( const Uint16Pair& rhs ) const
142 return mData > rhs.mData;
146 * @brief Create an instance by rounding a floating point vector to closest
149 * Uses a template for loose coupling, to save a header include, and allow any
150 * vector type with .x and .y members to be converted.
152 template<typename FLOAT_VECTOR_N_TYPE>
153 static Uint16Pair FromFloatVec2( const FLOAT_VECTOR_N_TYPE& from )
155 DALI_ASSERT_DEBUG( from.x + 0.5f < 65536.0f );
156 DALI_ASSERT_DEBUG( from.y + 0.5f < 65536.0f );
157 return Uint16Pair( from.x + 0.5f, from.y + 0.5f );
161 * @brief Create an instance by rounding a floating point array to closest
164 * Uses a template to allow any vector type with operator [] to be converted
165 * in addition to plain arrays.
167 template<typename FLOAT_ARRAY>
168 static Uint16Pair FromFloatArray( const FLOAT_ARRAY& from )
170 DALI_ASSERT_DEBUG( from[0] + 0.5f < 65536.0f );
171 DALI_ASSERT_DEBUG( from[1] + 0.5f < 65536.0f );
172 return Uint16Pair( from[0] + 0.5f, from[1] + 0.5f );
178 // Addressable view of X and Y:
179 uint16_t mComponents[2];
180 // Packed view of X and Y to force alignment and allow a faster copy:
185 // Allow Uint16Pair to be treated as a POD type
186 template <> struct TypeTraits< Uint16Pair > : public BasicTypes< Uint16Pair > { enum { IS_TRIVIAL_TYPE = true }; };
193 #endif // __DALI_UINT_16_PAIR_H__