dali/internal/imaging/common/image-operations.h

   1 /*
   2  * Copyright (c) 2018 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 #ifndef DALI_INTERNAL_PLATFORM_IMAGE_OPERATIONS_H_
  19 #define DALI_INTERNAL_PLATFORM_IMAGE_OPERATIONS_H_
  20
  21 // EXTERNAL INCLUDES
  22 #include <stdint.h>
  23
  24 // INTERNAL INCLUDES
  25 #include <dali/integration-api/bitmap.h>
  26 #include <dali/public-api/images/image-operations.h>
  27 #include <third-party/resampler/resampler.h>
  28 #include <dali/devel-api/adaptor-framework/pixel-buffer.h>
  29
  30 namespace Dali
  31 {
  32 namespace Internal
  33 {
  34 namespace Platform
  35 {
  36
  37 /**
  38  * @brief Identify which combination of x and y dimensions matter in terminating iterative box filtering.
  39  */
  40 enum BoxDimensionTest
  41 {
  42   BoxDimensionTestEither,
  43   BoxDimensionTestBoth,
  44   BoxDimensionTestX,
  45   BoxDimensionTestY
  46 };
  47
  48 /**
  49  * @brief The integer dimensions of an image or a region of an image packed into
  50  *        16 bits per component.
  51  * @note  This can only be used for images of up to 65535 x 65535 pixels.
  52   */
  53 typedef Uint16Pair ImageDimensions;
  54
  55 /**
  56  * @brief Work out the true desired width and height, accounting for special
  57  * rules for zeros in either or both input requested dimensions.
  58  *
  59  * @param[in] rawDimensions Width and height of image before processing.
  60  * @param[in] requestedDimensions Width and height of area to scale image into. Can be zero.
  61  * @return Dimensions of area to scale image into after special rules are applied.
  62  */
  63 ImageDimensions CalculateDesiredDimensions( ImageDimensions rawDimensions, ImageDimensions requestedDimensions );
  64
  65 /**
  66  * @defgroup BitmapOperations Bitmap-to-Bitmap Image operations.
  67  * @{
  68  */
  69
  70 /**
  71  * @brief Apply requested attributes to bitmap.
  72  *
  73  * This is the top-level function which runs the on-load image post-processing
  74  * pipeline. Bitmaps enter here as loaded from the file system by the file
  75  * loaders and leave downscaled and filtered as requested by the application,
  76  * ready for use.
  77  *
  78  * @param[in] bitmap The input bitmap.
  79  * @param[in] requestedAttributes Attributes which should be applied to bitmap.
  80  * @return A bitmap which results from applying the requested attributes to the
  81  *         bitmap passed-in, or the original bitmap passed in if the attributes
  82  *         have no effect.
  83  */
  84 Dali::Devel::PixelBuffer ApplyAttributesToBitmap( Dali::Devel::PixelBuffer bitmap, ImageDimensions dimensions, FittingMode::Type fittingMode = FittingMode::DEFAULT, SamplingMode::Type samplingMode = SamplingMode::DEFAULT );
  85
  86 /**
  87  * @brief Apply downscaling to a bitmap according to requested attributes.
  88  * @note The input bitmap pixel buffer may be modified and used as scratch working space for efficiency, so it must be discarded.
  89  **/
  90 Dali::Devel::PixelBuffer DownscaleBitmap( Dali::Devel::PixelBuffer bitmap,
  91                                           ImageDimensions desired,
  92                                           FittingMode::Type fittingMode,
  93                                           SamplingMode::Type samplingMode );
  94 /**@}*/
  95
  96 /**
  97  * @defgroup ImageBufferScalingAlgorithms Pixel buffer-level scaling algorithms.
  98  * @{
  99  */
 100
 101 /**
 102  * @brief Destructive in-place downscaling by a power of 2 factor.
 103  *
 104  * A box filter with a 2x2 kernel is repeatedly applied as long as the result
 105  * of the next downscaling step would not be smaller than the desired
 106  * dimensions.
 107  * @param[in,out] pixels The buffer both to read from and write the result to.
 108  * @param[in]     pixelFormat The format of the image pointed at by pixels.
 109  * @param[in]     inputWidth The width of the input image.
 110  * @param[in]     inputHeight The height of the input image.
 111  * @param[in]     desiredWidth The width the client is requesting.
 112  * @param[in]     desiredHeight The height the client is requesting.
 113  * @param[out]    outWidth  The resulting width after downscaling.
 114  * @param[out]    outHeight The resulting height after downscaling.
 115  */
 116 void DownscaleInPlacePow2( unsigned char * const pixels,
 117                            Pixel::Format pixelFormat,
 118                            unsigned int inputWidth,
 119                            unsigned int inputHeight,
 120                            unsigned int desiredWidth,
 121                            unsigned int desiredHeight,
 122                            FittingMode::Type fittingMode,
 123                            SamplingMode::Type samplingMode,
 124                            unsigned& outWidth,
 125                            unsigned& outHeight );
 126
 127 /**
 128  * @brief Destructive in-place downscaling by a power of 2 factor.
 129  *
 130  * A box filter with a 2x2 kernel is repeatedly applied as long as the result
 131  * of the next downscaling step would not be smaller than the desired
 132  * dimensions.
 133  * @param[in,out] pixels The buffer both to read from and write the result to.
 134  * @param[in]     inputWidth The width of the input image.
 135  * @param[in]     inputHeight The height of the input image.
 136  * @param[in]     desiredWidth The width the client is requesting.
 137  * @param[in]     desiredHeight The height the client is requesting.
 138  * @param[out]    outWidth  The resulting width after downscaling.
 139  * @param[out]    outHeight The resulting height after downscaling.
 140  */
 141 void DownscaleInPlacePow2RGB888( unsigned char * pixels,
 142                                  unsigned int inputWidth,
 143                                  unsigned int inputHeight,
 144                                  unsigned int desiredWidth,
 145                                  unsigned int desiredHeight,
 146                                  BoxDimensionTest dimensionTest,
 147                                  unsigned int& outWidth,
 148                                  unsigned int& outHeight );
 149
 150 /**
 151  * @copydoc DownscaleInPlacePow2RGB888
 152  */
 153 void DownscaleInPlacePow2RGBA8888( unsigned char * pixels,
 154                                    unsigned int inputWidth,
 155                                    unsigned int inputHeight,
 156                                    unsigned int desiredWidth,
 157                                    unsigned int desiredHeight,
 158                                    BoxDimensionTest dimensionTest,
 159                                    unsigned int& outWidth,
 160                                    unsigned int& outHeight );
 161
 162 /**
 163  * @copydoc DownscaleInPlacePow2RGB888
 164  *
 165  * For the 2-byte packed 16 bit format RGB565.
 166  */
 167 void DownscaleInPlacePow2RGB565( unsigned char * pixels,
 168                                  unsigned int inputWidth,
 169                                  unsigned int inputHeight,
 170                                  unsigned int desiredWidth,
 171                                  unsigned int desiredHeight,
 172                                  BoxDimensionTest dimensionTest,
 173                                  unsigned int& outWidth,
 174                                  unsigned int& outHeight );
 175
 176 /**
 177  * @copydoc DownscaleInPlacePow2RGB888
 178  *
 179  * For 2-byte formats such as lum8alpha8, but not packed 16 bit formats like RGB565.
 180  */
 181 void DownscaleInPlacePow2ComponentPair( unsigned char * pixels,
 182                                         unsigned int inputWidth,
 183                                         unsigned int inputHeight,
 184                                         unsigned int desiredWidth,
 185                                         unsigned int desiredHeight,
 186                                         BoxDimensionTest dimensionTest,
 187                                         unsigned int& outWidth,
 188                                         unsigned int& outHeight );
 189
 190 /**
 191  * @copydoc DownscaleInPlacePow2RGB888
 192  *
 193  * For single-byte formats such as lum8 or alpha8.
 194  */
 195 void DownscaleInPlacePow2SingleBytePerPixel( unsigned char * pixels,
 196                                              unsigned int inputWidth,
 197                                              unsigned int inputHeight,
 198                                              unsigned int desiredWidth,
 199                                              unsigned int desiredHeight,
 200                                              BoxDimensionTest dimensionTest,
 201                                              unsigned int& outWidth,
 202                                              unsigned int& outHeight );
 203
 204 /**
 205  * @brief Rescales an input image into the exact output dimensions passed-in.
 206  *
 207  * Uses point sampling, equivalent to GL_NEAREST texture filter mode, for the
 208  * fastest results, at the expense of aliasing (noisy images) when downscaling.
 209  * @note inPixels is allowed to alias outPixels if this is a downscaling,
 210  * but not for upscaling.
 211  */
 212 void PointSample( const unsigned char * inPixels,
 213                   unsigned int inputWidth,
 214                   unsigned int inputHeight,
 215                   Pixel::Format pixelFormat,
 216                   unsigned char * outPixels,
 217                   unsigned int desiredWidth,
 218                   unsigned int desiredHeight );
 219
 220 /**
 221  * @copydoc PointSample
 222  *
 223  * Specialised for 4-byte formats like RGBA8888 and BGRA8888.
 224  */
 225 void PointSample4BPP( const unsigned char * inPixels,
 226                       unsigned int inputWidth,
 227                       unsigned int inputHeight,
 228                       unsigned char * outPixels,
 229                       unsigned int desiredWidth,
 230                       unsigned int desiredHeight );
 231
 232 /**
 233  * @copydoc PointSample
 234  *
 235  * Specialised for 3-byte formats like RGB888 and BGR888.
 236  */
 237 void PointSample3BPP( const unsigned char * inPixels,
 238                       unsigned int inputWidth,
 239                       unsigned int inputHeight,
 240                       unsigned char * outPixels,
 241                       unsigned int desiredWidth,
 242                       unsigned int desiredHeight );
 243
 244 /**
 245  * @copydoc PointSample
 246  *
 247  * Specialised for 2-byte formats like LA88.
 248  */
 249 void PointSample2BPP( const unsigned char * inPixels,
 250                       unsigned int inputWidth,
 251                       unsigned int inputHeight,
 252                       unsigned char * outPixels,
 253                       unsigned int desiredWidth,
 254                       unsigned int desiredHeight );
 255
 256 /**
 257  * @copydoc PointSample
 258  *
 259  * Specialised for 1-byte formats like L8 and A8.
 260  */
 261 void PointSample1BPP( const unsigned char * inPixels,
 262                       unsigned int inputWidth,
 263                       unsigned int inputHeight,
 264                       unsigned char * outPixels,
 265                       unsigned int desiredWidth,
 266                       unsigned int desiredHeight );
 267
 268 /**
 269  * @brief Resample input image to output image using a bilinear filter.
 270  *
 271  * Each output pixel is formed of a weighted sum of a 2x2 block of four input
 272  * pixels
 273  * @pre inPixels must not alias outPixels. The input image should be a totally
 274  * separate buffer from the input one.
 275  */
 276 void LinearSample( const unsigned char * __restrict__ inPixels,
 277                    ImageDimensions inDimensions,
 278                    Pixel::Format pixelFormat,
 279                    unsigned char * __restrict__ outPixels,
 280                    ImageDimensions outDimensions );
 281
 282 /**
 283  * @copydoc LinearSample
 284  *
 285  * Specialised for one byte per pixel formats.
 286  */
 287 void LinearSample1BPP( const unsigned char * __restrict__ inPixels,
 288                        ImageDimensions inputDimensions,
 289                        unsigned char * __restrict__ outPixels,
 290                        ImageDimensions desiredDimensions );
 291
 292 /**
 293  * @copydoc LinearSample
 294  *
 295  * Specialised for two byte per pixel formats.
 296  */
 297 void LinearSample2BPP( const unsigned char * __restrict__ inPixels,
 298                        ImageDimensions inputDimensions,
 299                        unsigned char * __restrict__ outPixels,
 300                        ImageDimensions desiredDimensions );
 301
 302 /**
 303  * @copydoc LinearSample
 304  *
 305  * Specialised for RGB565 16 bit pixel format.
 306  */
 307 void LinearSampleRGB565( const unsigned char * __restrict__ inPixels,
 308                        ImageDimensions inputDimensions,
 309                        unsigned char * __restrict__ outPixels,
 310                        ImageDimensions desiredDimensions );
 311
 312 /**
 313  * @copydoc LinearSample
 314  *
 315  * Specialised for three byte per pixel formats like RGB888.
 316  */
 317 void LinearSample3BPP( const unsigned char * __restrict__ inPixels,
 318                        ImageDimensions inputDimensions,
 319                        unsigned char * __restrict__ outPixels,
 320                        ImageDimensions desiredDimensions );
 321
 322 /**
 323  * @copydoc LinearSample
 324  *
 325  * Specialised for four byte per pixel formats like RGBA8888.
 326  * @note, If used on RGBA8888, the A component will be blended independently.
 327  */
 328 void LinearSample4BPP( const unsigned char * __restrict__ inPixels,
 329                        ImageDimensions inputDimensions,
 330                        unsigned char * __restrict__ outPixels,
 331                        ImageDimensions desiredDimensions );
 332
 333 /**
 334  * @brief Resamples the input image with the Lanczos algorithm.
 335  *
 336  * @pre @p inPixels must not alias @p outPixels. The input image should be a totally
 337  * separate buffer from the output buffer.
 338  *
 339  * @param[in] inPixels Pointer to the input image buffer.
 340  * @param[in] inputDimensions The input dimensions of the image.
 341  * @param[out] outPixels Pointer to the output image buffer.
 342  * @param[in] desiredDimensions The output dimensions of the image.
 343  */
 344 void LanczosSample4BPP( const unsigned char * __restrict__ inPixels,
 345                         ImageDimensions inputDimensions,
 346                         unsigned char * __restrict__ outPixels,
 347                         ImageDimensions desiredDimensions );
 348
 349 /**
 350  * @brief Resamples the input image with the Lanczos algorithm.
 351  *
 352  * @pre @p inPixels must not alias @p outPixels. The input image should be a totally
 353  * separate buffer from the output buffer.
 354  *
 355  * @param[in] inPixels Pointer to the input image buffer.
 356  * @param[in] inputDimensions The input dimensions of the image.
 357  * @param[out] outPixels Pointer to the output image buffer.
 358  * @param[in] desiredDimensions The output dimensions of the image.
 359  */
 360 void LanczosSample1BPP( const unsigned char * __restrict__ inPixels,
 361                         ImageDimensions inputDimensions,
 362                         unsigned char * __restrict__ outPixels,
 363                         ImageDimensions desiredDimensions );
 364
 365 /**
 366  * @brief Resamples the input image with the Lanczos algorithm.
 367  *
 368  * @pre @p inPixels must not alias @p outPixels. The input image should be a totally
 369  * separate buffer from the output buffer.
 370  *
 371  * @param[in] inPixels Pointer to the input image buffer.
 372  * @param[in] inputDimensions The input dimensions of the image.
 373  * @param[out] outPixels Pointer to the output image buffer.
 374  * @param[in] desiredDimensions The output dimensions of the image.
 375  */
 376 void Resample( const unsigned char * __restrict__ inPixels,
 377                ImageDimensions inputDimensions,
 378                unsigned char * __restrict__ outPixels,
 379                ImageDimensions desiredDimensions,
 380                Resampler::Filter filterType,
 381                int numChannels, bool hasAlpha );
 382
 383
 384 /**
 385  * @brief Rotates the input image with an implementation of the 'Rotate by Shear' algorithm.
 386  *
 387  * @param[in] pixelsIn The input buffer.
 388  * @param[in] widthIn The width of the input buffer.
 389  * @param[in] heightIn The height of the input buffer.
 390  * @param[in] pixelSize The size of the pixel.
 391  * @param[in] radians The rotation angle in radians.
 392  * @param[out] pixelsOut The rotated output buffer.
 393  * @param[out] widthOut The width of the output buffer.
 394  * @param[out] heightOut The height of the output buffer.
 395  */
 396 void RotateByShear( const uint8_t* const pixelsIn,
 397                     unsigned int widthIn,
 398                     unsigned int heightIn,
 399                     unsigned int pixelSize,
 400                     float radians,
 401                     uint8_t*& pixelsOut,
 402                     unsigned int& widthOut,
 403                     unsigned int& heightOut );
 404
 405 /**@}*/
 406
 407 /**
 408  * @defgroup ScalingAlgorithmFragments Composable subunits of the scaling algorithms.
 409  * @{
 410  */
 411
 412 /**
 413  * @brief Average adjacent pairs of pixels, overwriting the input array.
 414  * @param[in,out] pixels The array of pixels to work on.
 415  * @param[i]      width  The number of pixels in the array passed-in.
 416  */
 417 void HalveScanlineInPlaceRGB888( unsigned char * pixels, unsigned int width );
 418
 419 /**
 420  * @copydoc HalveScanlineInPlaceRGB888
 421  */
 422 void HalveScanlineInPlaceRGBA8888( unsigned char * pixels, unsigned int width );
 423
 424 /**
 425  * @copydoc HalveScanlineInPlaceRGB888
 426  */
 427 void HalveScanlineInPlaceRGB565( unsigned char * pixels, unsigned int width );
 428
 429 /**
 430  * @copydoc HalveScanlineInPlaceRGB888
 431  */
 432 void HalveScanlineInPlace2Bytes( unsigned char * pixels, unsigned int width );
 433
 434 /**
 435  * @copydoc HalveScanlineInPlaceRGB888
 436  */
 437 void HalveScanlineInPlace1Byte( unsigned char * pixels, unsigned int width );
 438
 439 /**
 440  * @brief Average pixels at corresponding offsets in two scanlines.
 441  *
 442  * outputScanline is allowed to alias scanline1.
 443  * @param[in] scanline1 First scanline of pixels to average.
 444  * @param[in] scanline2 Second scanline of pixels to average.
 445  * @param[out] outputScanline Destination for the averaged pixels.
 446  * @param[in] width The widths of all the scanlines passed-in.
 447  */
 448 void AverageScanlines1( const unsigned char * scanline1,
 449                         const unsigned char * scanline2,
 450                         unsigned char* outputScanline,
 451                         /** Image width in pixels (1 byte == 1 pixel: e.g. lum8 or alpha8).*/
 452                         unsigned int width );
 453
 454 /**
 455  * @copydoc AverageScanlines1
 456  */
 457 void AverageScanlines2( const unsigned char * scanline1,
 458                         const unsigned char * scanline2,
 459                         unsigned char* outputScanline,
 460                         /** Image width in pixels (2 bytes == 1 pixel: e.g. lum8alpha8).*/
 461                         unsigned int width );
 462
 463 /**
 464  * @copydoc AverageScanlines1
 465  */
 466 void AverageScanlines3( const unsigned char * scanline1,
 467                         const unsigned char * scanline2,
 468                         unsigned char* outputScanline,
 469                         /** Image width in pixels (3 bytes == 1 pixel: e.g. RGB888).*/
 470                         unsigned int width );
 471
 472 /**
 473  * @copydoc AverageScanlines1
 474  */
 475 void AverageScanlinesRGBA8888( const unsigned char * scanline1,
 476                                const unsigned char * scanline2,
 477                                unsigned char * outputScanline,
 478                                unsigned int width );
 479
 480 /**
 481  * @copydoc AverageScanlines1
 482  */
 483 void AverageScanlinesRGB565( const unsigned char * scanline1,
 484                              const unsigned char * scanline2,
 485                              unsigned char* outputScanline,
 486                              unsigned int width );
 487 /**@}*/
 488
 489 /**
 490  * @defgroup TestableInlines Inline functions exposed in header to allow unit testing.
 491  * @{
 492  */
 493
 494 /**
 495  * @brief Average two integer arguments.
 496  * @return The average of two uint arguments.
 497  * @param[in] a First component to average.
 498  * @param[in] b Second component to average.
 499  **/
 500 inline unsigned int AverageComponent( unsigned int a, unsigned int b )
 501 {
 502   unsigned int avg = (a + b) >> 1u;
 503   return avg;
 504 }
 505
 506 /**
 507  * @brief Average a pair of RGBA8888 pixels.
 508  * @return The average of two RGBA8888 pixels.
 509  * @param[in] a First pixel to average.
 510  * @param[in] b Second pixel to average
 511  **/
 512 inline uint32_t AveragePixelRGBA8888( uint32_t a, uint32_t b )
 513 {
 514   const unsigned int avg =
 515     ((AverageComponent( (a & 0xff000000) >> 1u, (b & 0xff000000) >> 1u ) << 1u) & 0xff000000 ) +
 516     (AverageComponent( a & 0x00ff0000, b & 0x00ff0000 ) & 0x00ff0000 ) +
 517     (AverageComponent( a & 0x0000ff00, b & 0x0000ff00 ) & 0x0000ff00 ) +
 518     (AverageComponent( a & 0x000000ff, b & 0x000000ff ) );
 519   return avg;
 520   ///@ToDo: Optimise by trying return (((a ^ b) & 0xfefefefeUL) >> 1) + (a & b);
 521   ///@ToDo: Optimise for ARM using the single ARMV6 instruction: UHADD8  R4, R0, R5. This is not Neon. It runs in the normal integer pipeline so there is no downside like a stall moving between integer and copro.
 522 }
 523
 524 /**
 525  * @brief Average a pair of RGB565 pixels.
 526  * @param a[in] Low 16 bits hold a color value as RGB565 to average with parameter b.
 527  * @param b[in] Low 16 bits hold a color value as RGB565 to average with parameter a.
 528  * @return The average color of the two RGB565 pixels passed in, in the low 16 bits of the returned value.
 529  **/
 530 inline uint32_t AveragePixelRGB565( uint32_t a, uint32_t b )
 531 {
 532   const unsigned int avg =
 533     (AverageComponent( a & 0xf800, b & 0xf800 ) & 0xf800 ) +
 534     (AverageComponent( a & 0x7e0,  b & 0x7e0 )  & 0x7e0 ) +
 535     (AverageComponent( a & 0x1f,   b & 0x1f ) );
 536   return avg;
 537 }
 538
 539 /** @return The weighted blend of two integers as a 16.16 fixed-point number, given a 0.16 fixed-point blending factor. */
 540 inline unsigned int WeightedBlendIntToFixed1616(unsigned int a, unsigned int b, unsigned int fractBlend )
 541 {
 542   DALI_ASSERT_DEBUG( fractBlend <= 65535u && "Factor should be in 0.16 fixed-point." );
 543   const unsigned int weightedAFixed = a * (65535u - fractBlend);
 544   const unsigned int weightedBFixed = b * fractBlend;
 545   const unsigned blended = (weightedAFixed + weightedBFixed);
 546   return blended;
 547 }
 548
 549 /** @brief Blend two 16.16 inputs to give a 16.32 output. */
 550 inline uint64_t WeightedBlendFixed1616ToFixed1632(unsigned int a, unsigned int b, unsigned int fractBlend )
 551 {
 552   DALI_ASSERT_DEBUG( fractBlend <= 65535u && "Factor should be in 0.16 fixed-point." );
 553   // Blend while promoting intermediates to 16.32 fixed point:
 554   const uint64_t weightedAFixed = uint64_t(a) * (65535u - fractBlend);
 555   const uint64_t weightedBFixed = uint64_t(b) * fractBlend;
 556   const uint64_t blended = (weightedAFixed + weightedBFixed);
 557   return blended;
 558 }
 559
 560 /**
 561  * @brief Blend 4 taps into one value using horizontal and vertical weights.
 562  */
 563 inline unsigned int BilinearFilter1Component(unsigned int tl, unsigned int tr, unsigned int bl, unsigned int br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
 564 {
 565   DALI_ASSERT_DEBUG( fractBlendHorizontal <= 65535u && "Factor should be in 0.16 fixed-point." );
 566   DALI_ASSERT_DEBUG( fractBlendVertical   <= 65535u && "Factor should be in 0.16 fixed-point." );
 567
 568   const unsigned int topBlend = WeightedBlendIntToFixed1616( tl, tr, fractBlendHorizontal );
 569   const unsigned int botBlend = WeightedBlendIntToFixed1616( bl, br, fractBlendHorizontal );
 570   const uint64_t blended2x2 = WeightedBlendFixed1616ToFixed1632( topBlend, botBlend, fractBlendVertical );
 571   const unsigned int rounded = (blended2x2 + (1u << 31u) ) >> 32u;
 572   return rounded;
 573 }
 574
 575 /**@}*/
 576
 577 } /* namespace Platform */
 578 } /* namespace Internal */
 579 } /* namespace Dali */
 580
 581 #endif /* DALI_INTERNAL_PLATFORM_IMAGE_OPERATIONS_H_ */