1 #ifndef DALI_PIXEL_BUFFER_H
2 #define DALI_PIXEL_BUFFER_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.
22 #include <dali/public-api/images/pixel.h>
23 #include <dali/public-api/images/pixel-data.h>
24 #include <dali/public-api/object/base-handle.h>
27 #include <dali/public-api/dali-adaptor-common.h>
41 // Use namespace to separate from PixelBuffer typedef in buffer-image.h
46 * @brief The PixelBuffer object holds a pixel buffer.
48 * The PixelBuffer keeps ownership of it's initial buffer however, the
49 * user is free to modify the pixel data, either directly, or via
52 * In order to upload the pixel data to texture memory, there are two
53 * possibilities - either convert it back to a PixelData object, which
54 * releases the PixelBuffer object, leaving the user with an empty handle
55 * (ideal for one-time indirect image manipulation), or create a new
56 * PixelData object from this object, leaving the buffer intact (ideal
57 * for continuous manipulation)
61 class DALI_ADAPTOR_API PixelBuffer : public BaseHandle
66 * Create a PixelBuffer with it's own data buffer.
68 static PixelBuffer New( unsigned int width,
70 Dali::Pixel::Format pixelFormat );
73 * @brief Creates an empty handle.
74 * Use PixelBuffer::New() to create an initialized object.
88 * @brief This copy constructor is required for (smart) pointer semantics.
91 * @param[in] handle A reference to the copied handle
93 PixelBuffer(const PixelBuffer& handle);
96 * @brief This assignment operator is required for (smart) pointer semantics.
99 * @param[in] rhs A reference to the copied handle
100 * @return A reference to this object
102 PixelBuffer& operator=(const PixelBuffer& rhs);
105 * Convert to a pixel data and release the pixelBuffer's object.
106 * This handle is left empty.
108 * @warning Any other handles that keep a reference to this object
109 * will be left with no buffer, trying to access it will return NULL.
112 * @param[in,out] pixelBuffer
113 * @return a new PixelData which takes ownership of the PixelBuffer's buffer.
115 static PixelData Convert( PixelBuffer& pixelBuffer );
118 * Copy the data from this object into a new PixelData object, which could be
119 * used for uploading to a texture.
120 * @return a new PixelData object containing a copy of this pixel buffer's data.
122 Dali::PixelData CreatePixelData() const;
125 * @brief Gets the pixel buffer. This is a pointer to the internal
128 * @warning If there is no pixel buffer (e.g. this object has been
129 * converted to a PixelData), this method will return NULL.
132 * @return The pixel buffer, or NULL.
134 unsigned char* GetBuffer();
137 * @brief Gets the width of the buffer in pixels.
140 * @return The width of the buffer in pixels
142 unsigned int GetWidth() const;
145 * @brief Gets the height of the buffer in pixels.
148 * @return The height of the buffer in pixels
150 unsigned int GetHeight() const;
153 * @brief Gets the pixel format.
156 * @return The pixel format
158 Pixel::Format GetPixelFormat() const;
161 * Apply the mask to this pixel data, and return a new pixel data containing
162 * the masked image. If this PixelBuffer doesn't have an alpha channel, then
163 * the resultant PixelBuffer will be converted to a format that supports at
164 * least the width of the color channels and the alpha channel from the mask.
166 * If cropToMask is set to true, then the contentScale is applied first to
167 * this buffer, and the target buffer is cropped to the size of the mask. If
168 * it's set to false, then the mask is scaled to match this buffer's size
169 * before the mask is applied.
171 * @param[in] mask The mask to apply.
172 * @param[in] contentScale The scaling factor to apply to the content
173 * @param[in] cropToMask Whether to crop the output to the mask size (true)
174 * or scale the mask to the content size (false)
176 void ApplyMask( PixelBuffer mask, float contentScale=1.0f, bool cropToMask=false );
179 * Apply a Gaussian blur to this pixel data with the given radius.
181 * @note A bigger radius will yield a blurrier image. Only works for pixel data in RGBA format.
183 * @param[in] blurRadius The radius for Gaussian blur. A value of 0 or negative value indicates no blur.
185 void ApplyGaussianBlur( const float blurRadius );
188 * @brief Crops this buffer to the given crop rectangle.
190 * The crop rectangle will be clamped to the edges of the buffer if it is larger.
191 * @param[in] x The top left corner's X
192 * @param[in] y The top left corner's y
193 * @param[in] width The crop width
194 * @param[in] height The crop height
196 void Crop( uint16_t x, uint16_t y, uint16_t width, uint16_t height );
199 * @brief Resizes the buffer to the given dimensions.
201 * Uses either Lanczos4 for downscaling or Mitchell for upscaling
202 * @param[in] width The new width
203 * @param[in] height The new height
205 void Resize( uint16_t width, uint16_t height );
208 * @brief Returns Exif metadata as a property map
210 * @param[out] metadata Property map object to write into
211 * @return True on success
213 bool GetMetadata( Property::Map& metadata ) const;
216 * @brief Multiplies the image's color values by the alpha value. This provides better
217 * blending capability.
219 void MultiplyColorByAlpha();
222 * @brief Rotates the pixel buffer by the given angle.
224 * @note Operation valid for pixel formats: A8, L8, LA88, RGB888, RGB8888, BGR8888, RGBA8888 and BGRA8888. Fails otherwise.
225 * @note The operation does nothing for angles equivalent to 0 degrees: -360, 360, 720, etc.
226 * @note If the pixel buffer does rotate, all the pointers to the internal pixel buffer retrieved by the method GetPixelBuffer() become invalid.
228 * @param[in] angle The angle in degrees.
230 * @return @e false if the rotation fails (invalid pixel format or memory issues).
232 bool Rotate( Degree angle );
237 * @brief The constructor.
238 * @note Not intended for application developers.
240 * @param[in] pointer A pointer to a newly allocated PixelBuffer
242 explicit DALI_INTERNAL PixelBuffer( Internal::Adaptor::PixelBuffer* pointer );
248 #endif // DALI_PIXEL_BUFFER_H