1 #ifndef __DALI_IMAGE_H__
2 #define __DALI_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.
23 #include <cstdint> // uint32_t
26 #include <dali/public-api/object/base-handle.h>
27 #include <dali/public-api/signals/dali-signal.h>
32 * @addtogroup dali_core_images
36 namespace Internal DALI_INTERNAL
44 * @brief An Image object represents an image resource that can be used for rendering.
46 * Image objects can be shared between Actors. This is practical if you have a visual element on screen
47 * which is repeatedly used.
49 * The image resource is released as soon as the last Image handle is released.
51 * @note If a resource was shared between Image objects it exists until its last reference is gone.
53 * Image objects are responsible for the underlying resource's lifetime.
56 * | %Signal Name | Method |
57 * |------------------------|------------------------------|
58 * | uploaded | @ref UploadedSignal() |
61 class DALI_CORE_API Image : public BaseHandle
68 * @brief Type of signal for Image Uploaded.
71 typedef Signal< void (Image) > ImageSignalType;
78 * @brief Constructor which creates an empty Image handle.
80 * This class has no New method.
81 * Use the appropriate New method of its subclasses to create an initialized handle.
82 * (Dali::BufferImage::New(), Dali::EncodedBufferImage::New(), Dali::FrameBufferImage::New(),
83 * Dali::NativeImage::New(), Dali::ResourceImage::New()).
86 Image() DALI_DEPRECATED_API;
93 * This is non-virtual since derived Handle types must not contain data or virtual methods.
96 ~Image() DALI_DEPRECATED_API;
101 * @brief This copy constructor is required for (smart) pointer semantics.
104 * @param[in] handle A reference to the copied handle
106 Image(const Image& handle) DALI_DEPRECATED_API;
111 * @brief This assignment operator is required for (smart) pointer semantics.
114 * @param[in] rhs A reference to the copied handle
115 * @return A reference to this
117 Image& operator=(const Image& rhs) DALI_DEPRECATED_API;
122 * @brief Downcasts a handle to Image handle.
124 * If handle points to a Image object, the
125 * downcast produces valid handle. If not, the returned handle is left uninitialized.
127 * @param[in] handle Handle to an object
128 * @return Handle to a Image object or an uninitialized handle
130 static Image DownCast( BaseHandle handle ) DALI_DEPRECATED_API;
135 * @brief Returns the width of the image.
137 * Returns either the requested width or the actual loaded width if no specific size was requested.
140 * @return Width of the image in pixels
142 uint32_t GetWidth() const DALI_DEPRECATED_API;
147 * @brief Returns the height of the image.
149 * Returns either the requested height or the actual loaded height if no specific size was requested.
152 * @return Height of the image in pixels
154 uint32_t GetHeight() const DALI_DEPRECATED_API;
161 * @brief This signal is emitted when the image data gets uploaded to GL.
163 * It Will be sent after an actor using the image is added to
164 * the stage, when such a staged image is reloaded, or when a staged
165 * BufferImage calls Update().
167 * @return A signal object to Connect() with
169 ImageSignalType& UploadedSignal() DALI_DEPRECATED_API;
171 public: // Not intended for application developers
173 explicit DALI_INTERNAL Image(Internal::Image*);
181 #endif // __DALI_IMAGE_H__