1 #ifndef DALI_TOOLKIT_NPATCH_LOADER_H
2 #define DALI_TOOLKIT_NPATCH_LOADER_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.
22 #include <dali/public-api/rendering/texture-set.h>
23 #include <dali/devel-api/common/owner-container.h>
24 #include <dali/devel-api/adaptor-framework/pixel-buffer.h>
27 #include <dali-toolkit/internal/visuals/texture-manager-impl.h>
28 #include <dali-toolkit/devel-api/utility/npatch-utilities.h>
40 * The manager for loading Npatch textures.
41 * It caches them internally for better performance; i.e. to avoid loading and
42 * parsing the files over and over.
44 * Cache is not cleaned during app lifecycle as N patches take considerably
45 * small space and there's not usually a lot of them. Usually N patches are specified in
46 * toolkit default style and there is 1-2 per control that are shared across the whole application.
52 * Observer class to inform the npatch image is loaded.
54 class NPatchLoadObserver: public Dali::Toolkit::TextureUploadObserver
58 * Informs observer when the npatch image is loaded.
59 * @param[in] preMultiplied True if the image had pre-multiplied alpha applied
61 virtual void NPatchLoadComplete ( bool preMultiplied ) = 0;
66 UNINITIALIZED_ID = 0 ///< uninitialised id, use to initialize ids
78 loadCompleted( false ),
79 renderingMap{ nullptr }
84 using ObserverListType = Dali::Vector< NPatchLoadObserver* >;
86 TextureUploadObserver* textureObserver; ///< TextureUploadObserver that requests to load texture.
87 ObserverListType observerList; ///< Container used to store all observer clients of this Texture
88 std::string url; ///< Url of the N-Patch
89 TextureSet textureSet; ///< Texture containing the cropped image
90 NPatchUtility::StretchRanges stretchPixelsX; ///< X stretch pixels
91 NPatchUtility::StretchRanges stretchPixelsY; ///< Y stretch pixels
92 std::size_t hash; ///< Hash code for the Url
93 uint32_t croppedWidth; ///< Width of the cropped middle part of N-patch
94 uint32_t croppedHeight; ///< Height of the cropped middle part of N-patch
95 Rect< int > border; ///< The size of the border
96 bool preMultiplyOnLoad; ///< Whether to multiply alpha into color channels on load
97 bool loadCompleted; ///< True if the data loading is completed
98 void* renderingMap; ///< NPatch rendering data
109 * Destructor, non-virtual as not a base class
114 * @brief Retrieve a texture matching the n-patch url.
116 * @param [in] textureManager that will be used to loading image
117 * @param [in] nPatchObserver The NPatchVisual that requested loading.
118 * @param [in] url to retrieve
119 * @param [in] border The border size of the image
120 * @param [in,out] preMultiplyOnLoad True if the image color should be multiplied by it's alpha. Set to false if the
121 * image has no alpha channel
122 * @param [in] synchronousLoading True if the image will be loaded in synchronous time.
123 * @return id of the texture.
125 std::size_t Load( TextureManager& textureManager, NPatchLoadObserver* nPatchObserver, const std::string& url, const Rect< int >& border, bool& preMultiplyOnLoad, bool synchronousLoading );
128 * @brief Set loaded PixelBuffer and its information
130 * @param [in] id cache data id
131 * @param [in] pixelBuffer of loaded image
132 * @param [in] preMultiplied True if the image had pre-multiplied alpha applied
134 void SetNPatchData( std::size_t id, Devel::PixelBuffer& pixelBuffer, bool preMultiplied );
137 * @brief Retrieve N patch data matching to an id
138 * @param [in] id of data
139 * @param [out] data const pointer to the data
140 * @return true if data matching to id was really found
142 bool GetNPatchData( std::size_t id, const Data*& data );
144 void Remove( std::size_t id, TextureManager& textureManager, NPatchLoadObserver* nPatchObserver, bool synchronousLoading );
149 * Undefined copy constructor.
151 NPatchLoader(const NPatchLoader&);
154 * Undefined assignment operator.
156 NPatchLoader& operator=(const NPatchLoader& rhs);
160 OwnerContainer< Data* > mCache;
166 } // namespace Toolkit
170 #endif // DALI_TOOLKIT_NPATCH_LOADER_H