1 #ifndef __DALI_IMAGE_H__
2 #define __DALI_IMAGE_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/object/base-handle.h>
26 #include <dali/public-api/signals/dali-signal.h>
31 * @addtogroup dali_core_images
35 namespace Internal DALI_INTERNAL
41 * @brief An Image object represents an image resource that can be added to ImageViews.
43 * Image objects can be shared between ImageViews. This is practical if you have a visual element on screen
44 * which is repeatedly used. An example would be a button background image.
45 * The image resource is discarded when all ImageViews using the Image object are discarded.
47 * @note If a resource was shared between Image objects it exists until its last reference is gone.
49 * Image objects are responsible for the underlying resource's lifetime.
52 * | %Signal Name | Method |
53 * |------------------------|------------------------------|
54 * | uploaded | @ref UploadedSignal() |
57 class DALI_IMPORT_API Image : public BaseHandle
61 * @brief Resource management options.
65 * @DEPRECATED_1_1.3. Image resource is released as soon as last handle is released.
66 * @brief ReleasePolicy controls the way images are deleted from memory.
68 * @remarks This is an experimental feature and might not be supported in the next release.
69 * We do recommend not to use it.
73 UNUSED, ///< release resource once image is not in use anymore (eg. all actors using it become offstage). Reload when resource is required again. @SINCE_1_0.0
74 NEVER ///< keep image data for the lifetime of the object. (default) @SINCE_1_0.0
78 * @brief Type of signal for Image Uploaded.
81 typedef Signal< void (Image) > ImageSignalType;
86 * @brief Constructor which creates an empty Image handle.
88 * Use the appropriate New method to create an initialized handle.
96 * This is non-virtual since derived Handle types must not contain data or virtual methods.
102 * @brief This copy constructor is required for (smart) pointer semantics.
105 * @param [in] handle A reference to the copied handle
107 Image(const Image& handle);
110 * @brief This assignment operator is required for (smart) pointer semantics.
113 * @param [in] rhs A reference to the copied handle
114 * @return A reference to this
116 Image& operator=(const Image& rhs);
119 * @brief Downcast a handle to Image handle.
121 * If handle points to a Image object the
122 * downcast produces valid handle. If not the returned handle is left uninitialized.
124 * @param[in] handle Handle to an object
125 * @return Handle to a Image object or an uninitialized handle
127 static Image DownCast( BaseHandle handle );
132 * @brief Return resource release policy.
135 * @remarks This is an experimental feature and might not be supported in the next release.
136 * We do recommend not to use it.
137 * @return Resource release policy
139 ReleasePolicy GetReleasePolicy() const;
142 * @brief Returns the width of the image.
144 * Returns either the requested width or the actual loaded width if no specific size was requested.
147 * @return Width of the image in pixels.
149 unsigned int GetWidth() const;
152 * @brief Returns the height of the image.
154 * Returns either the requested height or the actual loaded height if no specific size was requested.
157 * @return Height of the image in pixels.
159 unsigned int GetHeight() const;
164 * @brief This signal is emitted when the image data gets uploaded to GL.
166 * It Will be sent after an actor using the image is added to
167 * the stage, when such a staged image is reloaded, or when a staged
168 * BufferImage calls Update().
170 * @return A signal object to Connect() with.
172 ImageSignalType& UploadedSignal();
174 public: // Not intended for application developers
176 explicit DALI_INTERNAL Image(Internal::Image*);
184 #endif // __DALI_IMAGE_H__