1 #ifndef __DALI_ENCODED_BUFFER_IMAGE_H__
2 #define __DALI_ENCODED_BUFFER_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/images/image.h>
26 #include <dali/public-api/images/image-operations.h>
27 #include <dali/public-api/math/uint-16-pair.h>
32 * @addtogroup dali-core-images
36 namespace Internal DALI_INTERNAL
38 class EncodedBufferImage;
41 typedef Uint16Pair ImageDimensions;
45 * @brief EncodedBufferImage represents an image resource that can be added to
48 * A memory buffer of encoded image data is provided by the application and
49 * decoded asynchronously on a background thread to fill the image's
52 * The buffer of data provided to an EncodedBufferImage factory function
53 * (New) should be filled with encoded image data in one of %Dali's
54 * supported image file formats, with the sequence of bytes in the buffer
55 * exactly matching the sequence of bytes that a file in the file system
56 * holding the encoded image data would have.
58 * The application may free the encoded image buffer passed to one of the
59 * New() static factory member functions as soon as they return.
63 * Image::LoadingFinishedSignal is emitted when the decoding of the
64 * image data is completed, either successfully or not.
66 * Image::UploadedSignal is emitted when the decoded image data gets
67 * uploaded to the OpenGL ES implementation.
69 class DALI_IMPORT_API EncodedBufferImage : public Image
73 * @brief Constructor which creates an uninitialized EncodedBufferImage object.
75 * Use Image::New(...) to create an initialised object.
80 * @brief Create an initialised image object from an encoded image buffer in memory.
82 * The image will be created eagerly using LoadPolicy::Immediate.
83 * The function is non-blocking and returns immediately while the image
84 * decoding happens on a background thread.
85 * @param [in] encodedImage The encoded bytes of an image, in a supported
86 * image format such as PNG, JPEG, GIF, BMP, KTX, ICO, and WBMP, organised
87 * exactly as it would be as a file in the filesystem.
88 * The caller retains ownership of this buffer and is free to modify or
89 * discard it as soon as the function returns.
90 * @param [in] encodedImageByteCount The size in bytes of the buffer pointed to
92 * @param [in] size The width and height to fit the loaded image to.
93 * @param [in] fittingMode The method used to fit the shape of the image before loading to the shape defined by the size parameter.
94 * @param [in] samplingMode The filtering method used when sampling pixels from the input image while fitting it to desired size.
95 * @param [in] releasePol The ReleasePolicy to apply to Image. If the Unused
96 * @param [in] orientationCorrection Reorient the image to respect any orientation metadata in its header.
97 * policy is set, a reload will not be possible, so the Image should never be
98 * used once all actors using it have gone off-stage.
99 * @return A handle to a newly allocated object.
101 static EncodedBufferImage New( const uint8_t * const encodedImage, std::size_t encodedImageByteCount, ImageDimensions size, FittingMode::Type fittingMode, SamplingMode::Type samplingMode, ReleasePolicy releasePol = Image::NEVER, bool orientationCorrection = true );
104 * @brief Create an initialised image object from an encoded image buffer in memory.
106 * The image will be created eagerly using LoadPolicy::Immediate.
107 * The function is non-blocking and returns immediately while the image
108 * decoding happens on a background thread.
109 * @param [in] encodedImage The encoded bytes of an image, in a supported
110 * image format such as PNG, JPEG, GIF, BMP, KTX, ICO, and WBMP, organised
111 * exactly as it would be as a file in the filesystem.
112 * The caller retains ownership of this buffer and is free to modify or
113 * discard it as soon as the function returns.
114 * @param [in] encodedImageByteCount The size in bytes of the buffer pointed to
116 * @return A handle to a newly allocated object.
118 static EncodedBufferImage New( const uint8_t * const encodedImage, std::size_t encodedImageByteCount );
121 * @brief Downcast an Object handle to EncodedBufferImage.
123 * If handle points to a EncodedBufferImage the
124 * downcast produces valid handle. If not the returned handle is left uninitialized.
125 * @param[in] handle to An object
126 * @return handle to a EncodedBufferImage or an uninitialized handle
128 static EncodedBufferImage DownCast( BaseHandle handle );
133 * This is non-virtual since derived Handle types must not contain data or virtual methods.
135 ~EncodedBufferImage();
138 * @brief This copy constructor is required for (smart) pointer semantics.
140 * @param [in] handle A reference to the copied handle
142 EncodedBufferImage(const EncodedBufferImage& handle);
145 * @brief This assignment operator is required for (smart) pointer semantics.
147 * @param [in] rhs A reference to the copied handle
148 * @return A reference to this
150 EncodedBufferImage& operator=(const EncodedBufferImage& rhs);
152 public: // Not intended for application developers
154 explicit DALI_INTERNAL EncodedBufferImage(Internal::EncodedBufferImage*);
162 #endif // __DALI_ENCODED_BUFFER_IMAGE_H__