1 #ifndef __DALI_RESOURCE_IMAGE_H__
2 #define __DALI_RESOURCE_IMAGE_H__
5 * Copyright (c) 2018 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/loading-state.h>
26 #include <dali/public-api/images/image.h>
27 #include <dali/public-api/signals/dali-signal.h>
28 #include <dali/public-api/images/image-operations.h>
33 * @addtogroup dali_core_images
37 namespace Internal DALI_INTERNAL
45 * @brief ResourceImage is an image loaded using a URL.
47 * <i>Customizing load requests</i>
49 * Size, scaling mode, filter mode, and orientation compensation can be set when requesting an image.
51 * <i>Reloading images</i>
53 * The same request used on creating the ResourceImage is re-issued when reloading images.
54 * If the file changed since the last load operation, this might result in a different resource.
55 * Reload only takes effect if the ResourceImage has already finished loading.
58 * | %Signal Name | Method |
59 * |----------------------|------------------------------|
60 * | imageLoadingFinished | @ref LoadingFinishedSignal() |
63 class DALI_CORE_API ResourceImage : public Image
70 * @brief Type of signal for LoadingFinished and Uploaded.
73 typedef Signal< void (ResourceImage) > ResourceImageSignal;
80 * @brief Gets the size of an image from disk.
82 * This function will read the header info from file on disk and is
83 * synchronous, so it should not be used repeatedly or in tight
88 * @param[in] url The URL of the image file
89 * @return The width and height in pixels of the image
91 static ImageDimensions GetImageSize( const std::string& url ) DALI_DEPRECATED_API;
96 * @brief Constructor which creates an empty ResourceImage object.
98 * Use ResourceImage::New(...) to create an initialised object.
101 ResourceImage() DALI_DEPRECATED_API;
108 * This is non-virtual since derived Handle types must not contain data or virtual methods.
111 ~ResourceImage() DALI_DEPRECATED_API;
116 * @brief This copy constructor is required for (smart) pointer semantics.
119 * @param[in] handle A reference to the copied handle
121 ResourceImage( const ResourceImage& handle ) DALI_DEPRECATED_API;
126 * @brief This assignment operator is required for (smart) pointer semantics.
129 * @param[in] rhs A reference to the copied handle
130 * @return A reference to this
132 ResourceImage& operator=( const ResourceImage& rhs ) DALI_DEPRECATED_API;
135 * @name ResourceImageFactoryFunctions
136 * Creates ResourceImage object instances using these functions.
143 * @brief Creates an initialized ResourceImage object.
145 * Uses defaults for all options.
147 * @sa Dali::FittingMode::Type Dali::SamplingMode::Type
151 * @param[in] url The URL of the image file to use
152 * @param[in] orientationCorrection Reorient the image to respect any orientation metadata in its header
153 * @return A handle to a newly allocated object
155 static ResourceImage New( const std::string& url, bool orientationCorrection = true ) DALI_DEPRECATED_API;
160 * @brief Creates an initialized ResourceImage object.
165 * @param[in] url The URL of the image file to use
166 * @param[in] size The width and height to fit the loaded image to
167 * @param[in] fittingMode The method used to fit the shape of the image before loading to the shape defined by the size parameter
168 * @param[in] samplingMode The filtering method used when sampling pixels from the input image while fitting it to desired size
169 * @param[in] orientationCorrection Reorient the image to respect any orientation metadata in its header
170 * @return A handle to a newly allocated object
172 static ResourceImage New( const std::string& url,
173 ImageDimensions size,
174 FittingMode::Type fittingMode = FittingMode::DEFAULT,
175 SamplingMode::Type samplingMode = SamplingMode::DEFAULT,
176 bool orientationCorrection = true ) DALI_DEPRECATED_API;
183 * @brief Downcasts a handle to ResourceImage handle.
185 * If handle points to a ResourceImage object, the
186 * downcast produces valid handle. If not, the returned handle is left uninitialized.
188 * @param[in] handle Handle to an object
189 * @return Handle to a Image object or an uninitialized handle
191 static ResourceImage DownCast( BaseHandle handle ) DALI_DEPRECATED_API;
196 * @brief Queries whether the image data has loaded.
198 * The asynchronous loading begins when the Image object is created.
199 * After the Image object is discarded, the image data will be released from memory.
201 * @return The loading state, either Loading, Success or Failed
203 LoadingState GetLoadingState() const DALI_DEPRECATED_API;
208 * @brief Returns the URL of the image.
211 * @return The URL of the image file
213 std::string GetUrl() const DALI_DEPRECATED_API;
218 * @brief Reloads image from filesystem.
220 * The original set of image loading attributes (requested dimensions, scaling
221 * mode and filter mode) are used when requesting the image again.
223 * @note If image is offstage and OnDemand policy is set, the reload request is ignored.
225 void Reload() DALI_DEPRECATED_API;
232 * @brief Emitted when the image data loads successfully, or when the loading fails.
235 * @return A signal object to Connect() with
237 ResourceImageSignal& LoadingFinishedSignal() DALI_DEPRECATED_API;
239 public: // Not intended for application developers
241 explicit DALI_INTERNAL ResourceImage( Internal::ResourceImage* );
249 #endif // __DALI_RESOURCE_IMAGE_H__