2 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include "image-operations.h"
25 #include <dali/integration-api/debug.h>
26 #include <dali/public-api/common/dali-vector.h>
27 #include <dali/public-api/math/vector2.h>
28 #include <resampler.h>
42 // The BORDER_FILL_VALUE is a single byte value that is used for horizontal and vertical borders.
43 // A value of 0x00 gives us transparency for pixel buffers with an alpha channel, or black otherwise.
44 // We can optionally use a Vector4 color here, but at reduced fill speed.
45 const uint8_t BORDER_FILL_VALUE( 0x00 );
46 // A maximum size limit for newly created bitmaps. ( 1u << 16 ) - 1 is chosen as we are using 16bit words for dimensions.
47 const unsigned int MAXIMUM_TARGET_BITMAP_SIZE( ( 1u << 16 ) - 1 );
49 // Constants used by the ImageResampler.
50 const float DEFAULT_SOURCE_GAMMA = 1.75f; ///< Default source gamma value used in the Resampler() function. Partial gamma correction looks better on mips. Set to 1.0 to disable gamma correction.
51 const float FILTER_SCALE = 1.f; ///< Default filter scale value used in the Resampler() function. Filter scale - values < 1.0 cause aliasing, but create sharper looking mips.
52 const char* const FILTER_TYPE = "lanczos4"; ///< Default filter used in the Resampler() function. Possible Lanczos filters are: lanczos3, lanczos4, lanczos6, lanczos12
54 using Integration::Bitmap;
55 using Integration::BitmapPtr;
56 typedef unsigned char PixelBuffer;
59 * @brief 4 byte pixel structure.
67 } __attribute__((packed, aligned(4))); //< Tell the compiler it is okay to use a single 32 bit load.
70 * @brief RGB888 pixel structure.
77 } __attribute__((packed, aligned(1)));
80 * @brief RGB565 pixel typedefed from a short.
82 * Access fields by manual shifting and masking.
84 typedef uint16_t PixelRGB565;
87 * @brief a Pixel composed of two independent byte components.
93 } __attribute__((packed, aligned(2))); //< Tell the compiler it is okay to use a single 16 bit load.
96 #if defined(DEBUG_ENABLED)
98 * Disable logging of image operations or make it verbose from the commandline
99 * as follows (e.g., for dali demo app):
101 * LOG_IMAGE_OPERATIONS=0 dali-demo #< off
102 * LOG_IMAGE_OPERATIONS=3 dali-demo #< on, verbose
105 Debug::Filter* gImageOpsLogFilter = Debug::Filter::New( Debug::NoLogging, false, "LOG_IMAGE_OPERATIONS" );
108 /** @return The greatest even number less than or equal to the argument. */
109 inline unsigned int EvenDown( const unsigned int a )
111 const unsigned int evened = a & ~1u;
116 * @brief Log bad parameters.
118 void ValidateScalingParameters( const unsigned int inputWidth,
119 const unsigned int inputHeight,
120 const unsigned int desiredWidth,
121 const unsigned int desiredHeight )
123 if( desiredWidth > inputWidth || desiredHeight > inputHeight )
125 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Upscaling not supported (%u, %u -> %u, %u).\n", inputWidth, inputHeight, desiredWidth, desiredHeight );
128 if( desiredWidth == 0u || desiredHeight == 0u )
130 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Downscaling to a zero-area target is pointless.\n" );
133 if( inputWidth == 0u || inputHeight == 0u )
135 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Zero area images cannot be scaled\n" );
140 * @brief Do debug assertions common to all scanline halving functions.
141 * @note Inline and in anon namespace so should boil away in release builds.
143 inline void DebugAssertScanlineParameters( const uint8_t * const pixels, const unsigned int width )
145 DALI_ASSERT_DEBUG( pixels && "Null pointer." );
146 DALI_ASSERT_DEBUG( width > 1u && "Can't average fewer than two pixels." );
147 DALI_ASSERT_DEBUG( width < 131072u && "Unusually wide image: are you sure you meant to pass that value in?" );
151 * @brief Assertions on params to functions averaging pairs of scanlines.
152 * @note Inline as intended to boil away in release.
154 inline void DebugAssertDualScanlineParameters( const uint8_t * const scanline1,
155 const uint8_t * const scanline2,
156 uint8_t* const outputScanline,
157 const size_t widthInComponents )
159 DALI_ASSERT_DEBUG( scanline1 && "Null pointer." );
160 DALI_ASSERT_DEBUG( scanline2 && "Null pointer." );
161 DALI_ASSERT_DEBUG( outputScanline && "Null pointer." );
162 DALI_ASSERT_DEBUG( ((scanline1 >= scanline2 + widthInComponents) || (scanline2 >= scanline1 + widthInComponents )) && "Scanlines alias." );
163 DALI_ASSERT_DEBUG( ((((void*)outputScanline) >= (void*)(scanline2 + widthInComponents)) || (((void*)scanline2) >= (void*)(scanline1 + widthInComponents))) && "Scanline 2 aliases output." );
167 * @brief Converts a scaling mode to the definition of which dimensions matter when box filtering as a part of that mode.
169 BoxDimensionTest DimensionTestForScalingMode( FittingMode::Type fittingMode )
171 BoxDimensionTest dimensionTest;
172 dimensionTest = BoxDimensionTestEither;
174 switch( fittingMode )
176 // Shrink to fit attempts to make one or zero dimensions smaller than the
177 // desired dimensions and one or two dimensions exactly the same as the desired
178 // ones, so as long as one dimension is larger than the desired size, box
179 // filtering can continue even if the second dimension is smaller than the
180 // desired dimensions:
181 case FittingMode::SHRINK_TO_FIT:
183 dimensionTest = BoxDimensionTestEither;
186 // Scale to fill mode keeps both dimensions at least as large as desired:
187 case FittingMode::SCALE_TO_FILL:
189 dimensionTest = BoxDimensionTestBoth;
192 // Y dimension is irrelevant when downscaling in FIT_WIDTH mode:
193 case FittingMode::FIT_WIDTH:
195 dimensionTest = BoxDimensionTestX;
198 // X Dimension is ignored by definition in FIT_HEIGHT mode:
199 case FittingMode::FIT_HEIGHT:
201 dimensionTest = BoxDimensionTestY;
206 return dimensionTest;
210 * @brief Work out the dimensions for a uniform scaling of the input to map it
211 * into the target while effecting ShinkToFit scaling mode.
213 ImageDimensions FitForShrinkToFit( ImageDimensions target, ImageDimensions source )
215 // Scale the input by the least extreme of the two dimensions:
216 const float widthScale = target.GetX() / float(source.GetX());
217 const float heightScale = target.GetY() / float(source.GetY());
218 const float scale = widthScale < heightScale ? widthScale : heightScale;
220 // Do no scaling at all if the result would increase area:
226 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
230 * @brief Work out the dimensions for a uniform scaling of the input to map it
231 * into the target while effecting SCALE_TO_FILL scaling mode.
232 * @note An image scaled into the output dimensions will need either top and
233 * bottom or left and right to be cropped away unless the source was pre-cropped
234 * to match the destination aspect ratio.
236 ImageDimensions FitForScaleToFill( ImageDimensions target, ImageDimensions source )
238 DALI_ASSERT_DEBUG( source.GetX() > 0 && source.GetY() > 0 && "Zero-area rectangles should not be passed-in" );
239 // Scale the input by the least extreme of the two dimensions:
240 const float widthScale = target.GetX() / float(source.GetX());
241 const float heightScale = target.GetY() / float(source.GetY());
242 const float scale = widthScale > heightScale ? widthScale : heightScale;
244 // Do no scaling at all if the result would increase area:
250 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
254 * @brief Work out the dimensions for a uniform scaling of the input to map it
255 * into the target while effecting FIT_WIDTH scaling mode.
257 ImageDimensions FitForFitWidth( ImageDimensions target, ImageDimensions source )
259 DALI_ASSERT_DEBUG( source.GetX() > 0 && "Cant fit a zero-dimension rectangle." );
260 const float scale = target.GetX() / float(source.GetX());
262 // Do no scaling at all if the result would increase area:
267 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
271 * @brief Work out the dimensions for a uniform scaling of the input to map it
272 * into the target while effecting FIT_HEIGHT scaling mode.
274 ImageDimensions FitForFitHeight( ImageDimensions target, ImageDimensions source )
276 DALI_ASSERT_DEBUG( source.GetY() > 0 && "Cant fit a zero-dimension rectangle." );
277 const float scale = target.GetY() / float(source.GetY());
279 // Do no scaling at all if the result would increase area:
285 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
289 * @brief Generate the rectangle to use as the target of a pixel sampling pass
290 * (e.g., nearest or linear).
292 ImageDimensions FitToScalingMode( ImageDimensions requestedSize, ImageDimensions sourceSize, FittingMode::Type fittingMode )
294 ImageDimensions fitDimensions;
295 switch( fittingMode )
297 case FittingMode::SHRINK_TO_FIT:
299 fitDimensions = FitForShrinkToFit( requestedSize, sourceSize );
302 case FittingMode::SCALE_TO_FILL:
304 fitDimensions = FitForScaleToFill( requestedSize, sourceSize );
307 case FittingMode::FIT_WIDTH:
309 fitDimensions = FitForFitWidth( requestedSize, sourceSize );
312 case FittingMode::FIT_HEIGHT:
314 fitDimensions = FitForFitHeight( requestedSize, sourceSize );
319 return fitDimensions;
323 * @brief Calculate the number of lines on the X and Y axis that need to be
324 * either added or removed with repect to the specified fitting mode.
325 * (e.g., nearest or linear).
326 * @param[in] sourceSize The size of the source image
327 * @param[in] fittingMode The fitting mode to use
328 * @param[in/out] requestedSize The target size that the image will be fitted to.
329 * If the source image is smaller than the requested size, the source is not scaled up.
330 * So we reduce the target size while keeping aspect by lowering resolution.
331 * @param[out] scanlinesToCrop The number of scanlines to remove from the image (can be negative to represent Y borders required)
332 * @param[out] columnsToCrop The number of columns to remove from the image (can be negative to represent X borders required)
334 void CalculateBordersFromFittingMode( ImageDimensions sourceSize, FittingMode::Type fittingMode, ImageDimensions& requestedSize, int& scanlinesToCrop, int& columnsToCrop )
336 const unsigned int sourceWidth( sourceSize.GetWidth() );
337 const unsigned int sourceHeight( sourceSize.GetHeight() );
338 const float targetAspect( static_cast< float >( requestedSize.GetWidth() ) / static_cast< float >( requestedSize.GetHeight() ) );
342 switch( fittingMode )
344 case FittingMode::FIT_WIDTH:
346 finalWidth = sourceWidth;
347 finalHeight = static_cast< float >( sourceWidth ) / targetAspect;
350 scanlinesToCrop = -( finalHeight - sourceHeight );
354 case FittingMode::FIT_HEIGHT:
356 finalWidth = static_cast< float >( sourceHeight ) * targetAspect;
357 finalHeight = sourceHeight;
359 columnsToCrop = -( finalWidth - sourceWidth );
364 case FittingMode::SHRINK_TO_FIT:
366 const float sourceAspect( static_cast< float >( sourceWidth ) / static_cast< float >( sourceHeight ) );
367 if( sourceAspect > targetAspect )
369 finalWidth = sourceWidth;
370 finalHeight = static_cast< float >( sourceWidth ) / targetAspect;
373 scanlinesToCrop = -( finalHeight - sourceHeight );
377 finalWidth = static_cast< float >( sourceHeight ) * targetAspect;
378 finalHeight = sourceHeight;
380 columnsToCrop = -( finalWidth - sourceWidth );
386 case FittingMode::SCALE_TO_FILL:
388 const float sourceAspect( static_cast< float >( sourceWidth ) / static_cast< float >( sourceHeight ) );
389 if( sourceAspect > targetAspect )
391 finalWidth = static_cast< float >( sourceHeight ) * targetAspect;
392 finalHeight = sourceHeight;
394 columnsToCrop = -( finalWidth - sourceWidth );
399 finalWidth = sourceWidth;
400 finalHeight = static_cast< float >( sourceWidth ) / targetAspect;
403 scanlinesToCrop = -( finalHeight - sourceHeight );
409 requestedSize.SetWidth( finalWidth );
410 requestedSize.SetHeight( finalHeight );
414 * @brief Construct a bitmap with format and dimensions requested.
416 BitmapPtr MakeEmptyBitmap( Pixel::Format pixelFormat, unsigned int width, unsigned int height )
418 DALI_ASSERT_DEBUG( Pixel::GetBytesPerPixel(pixelFormat) && "Compressed formats not supported." );
420 // Allocate a pixel buffer to hold the image passed in:
421 Integration::BitmapPtr newBitmap = Integration::Bitmap::New( Integration::Bitmap::BITMAP_2D_PACKED_PIXELS, ResourcePolicy::OWNED_DISCARD );
422 newBitmap->GetPackedPixelsProfile()->ReserveBuffer( pixelFormat, width, height, width, height );
427 * @brief Construct a bitmap object from a copy of the pixel array passed in.
429 BitmapPtr MakeBitmap( const uint8_t * const pixels, Pixel::Format pixelFormat, unsigned int width, unsigned int height )
431 DALI_ASSERT_DEBUG( pixels && "Null bitmap buffer to copy." );
433 // Allocate a pixel buffer to hold the image passed in:
434 Integration::BitmapPtr newBitmap = MakeEmptyBitmap( pixelFormat, width, height );
436 // Copy over the pixels from the downscaled image that was generated in-place in the pixel buffer of the input bitmap:
437 memcpy( newBitmap->GetBuffer(), pixels, width * height * Pixel::GetBytesPerPixel( pixelFormat ) );
442 * @brief Work out the desired width and height, accounting for zeros.
444 * @param[in] bitmapWidth Width of image before processing.
445 * @param[in] bitmapHeight Height of image before processing.
446 * @param[in] requestedWidth Width of area to scale image into. Can be zero.
447 * @param[in] requestedHeight Height of area to scale image into. Can be zero.
448 * @return Dimensions of area to scale image into after special rules are applied.
450 ImageDimensions CalculateDesiredDimensions( unsigned int bitmapWidth, unsigned int bitmapHeight, unsigned int requestedWidth, unsigned int requestedHeight )
452 // If no dimensions have been requested, default to the source ones:
453 if( requestedWidth == 0 && requestedHeight == 0 )
455 return ImageDimensions( bitmapWidth, bitmapHeight );
458 // If both dimensions have values requested, use them both:
459 if( requestedWidth != 0 && requestedHeight != 0 )
461 return ImageDimensions( requestedWidth, requestedHeight );
464 // Only one of the dimensions has been requested. Calculate the other from
465 // the requested one and the source image aspect ratio:
466 if( requestedWidth != 0 )
468 return ImageDimensions( requestedWidth, bitmapHeight / float(bitmapWidth) * requestedWidth + 0.5f );
470 return ImageDimensions( bitmapWidth / float(bitmapHeight) * requestedHeight + 0.5f, requestedHeight );
473 } // namespace - unnamed
475 ImageDimensions CalculateDesiredDimensions( ImageDimensions rawDimensions, ImageDimensions requestedDimensions )
477 return CalculateDesiredDimensions( rawDimensions.GetWidth(), rawDimensions.GetHeight(), requestedDimensions.GetWidth(), requestedDimensions.GetHeight() ) ;
481 * @brief Apply cropping and padding for specified fitting mode.
483 * Once the bitmap has been (optionally) downscaled to an appropriate size, this method performs alterations
484 * based on the fitting mode.
486 * This will add vertical or horizontal borders if necessary.
487 * Crop the source image data vertically or horizontally if necessary.
488 * The aspect of the source image is preserved.
489 * If the source image is smaller than the desired size, the algorithm will modify the the newly created
490 * bitmaps dimensions to only be as large as necessary, as a memory saving optimization. This will cause
491 * GPU scaling to be performed at render time giving the same result with less texture traversal.
493 * @param[in] bitmap The source bitmap to perform modifications on.
494 * @param[in] desiredDimensions The target dimensions to aim to fill based on the fitting mode.
495 * @param[in] fittingMode The fitting mode to use.
497 * @return A new bitmap with the padding and cropping required for fitting mode applied.
498 * If no modification is needed or possible, the passed in bitmap is returned.
500 Integration::BitmapPtr CropAndPadForFittingMode( Integration::BitmapPtr bitmap, ImageDimensions desiredDimensions, FittingMode::Type fittingMode );
503 * @brief Adds horizontal or vertical borders to the source image.
505 * @param[in] targetPixels The destination image pointer to draw the borders on.
506 * @param[in] bytesPerPixel The number of bytes per pixel of the target pixel buffer.
507 * @param[in] targetDimensions The dimensions of the destination image.
508 * @param[in] padDimensions The columns and scanlines to pad with borders.
510 void AddBorders( PixelBuffer *targetPixels, const unsigned int bytesPerPixel, const ImageDimensions targetDimensions, const ImageDimensions padDimensions );
512 BitmapPtr ApplyAttributesToBitmap( BitmapPtr bitmap, ImageDimensions dimensions, FittingMode::Type fittingMode, SamplingMode::Type samplingMode )
516 // Calculate the desired box, accounting for a possible zero component:
517 const ImageDimensions desiredDimensions = CalculateDesiredDimensions( bitmap->GetImageWidth(), bitmap->GetImageHeight(), dimensions.GetWidth(), dimensions.GetHeight() );
519 // If a different size than the raw one has been requested, resize the image
520 // maximally using a repeated box filter without making it smaller than the
521 // requested size in either dimension:
522 bitmap = DownscaleBitmap( *bitmap, desiredDimensions, fittingMode, samplingMode );
524 // Cut the bitmap according to the desired width and height so that the
525 // resulting bitmap has the same aspect ratio as the desired dimensions.
526 // Add crop and add borders if necessary depending on fitting mode.
527 if( bitmap && bitmap->GetPackedPixelsProfile() )
529 bitmap = CropAndPadForFittingMode( bitmap, desiredDimensions, fittingMode );
532 // Examine the image pixels remaining after cropping and scaling to see if all
533 // are opaque, allowing faster rendering, or some have non-1.0 alpha:
534 if( bitmap && bitmap->GetPackedPixelsProfile() && Pixel::HasAlpha( bitmap->GetPixelFormat() ) )
536 bitmap->GetPackedPixelsProfile()->TestForTransparency();
543 BitmapPtr CropAndPadForFittingMode( BitmapPtr bitmap, ImageDimensions desiredDimensions, FittingMode::Type fittingMode )
545 const unsigned int inputWidth = bitmap->GetImageWidth();
546 const unsigned int inputHeight = bitmap->GetImageHeight();
548 if( desiredDimensions.GetWidth() < 1u || desiredDimensions.GetHeight() < 1u )
550 DALI_LOG_WARNING( "Image scaling aborted as desired dimensions too small (%u, %u).\n", desiredDimensions.GetWidth(), desiredDimensions.GetHeight() );
552 else if( inputWidth != desiredDimensions.GetWidth() || inputHeight != desiredDimensions.GetHeight() )
554 // Calculate any padding or cropping that needs to be done based on the fitting mode.
555 // Note: If the desired size is larger than the original image, the desired size will be
556 // reduced while maintaining the aspect, in order to save unnecessary memory usage.
557 int scanlinesToCrop = 0;
558 int columnsToCrop = 0;
560 CalculateBordersFromFittingMode( ImageDimensions( inputWidth, inputHeight ), fittingMode, desiredDimensions, scanlinesToCrop, columnsToCrop );
562 unsigned int desiredWidth( desiredDimensions.GetWidth() );
563 unsigned int desiredHeight( desiredDimensions.GetHeight() );
565 // Action the changes by making a new bitmap with the central part of the loaded one if required.
566 if( scanlinesToCrop != 0 || columnsToCrop != 0 )
568 // Split the adding and removing of scanlines and columns into separate variables,
569 // so we can use one piece of generic code to action the changes.
570 unsigned int scanlinesToPad = 0;
571 unsigned int columnsToPad = 0;
572 if( scanlinesToCrop < 0 )
574 scanlinesToPad = -scanlinesToCrop;
577 if( columnsToCrop < 0 )
579 columnsToPad = -columnsToCrop;
583 // If there is no filtering, then the final image size can become very large, exit if larger than maximum.
584 if( ( desiredWidth > MAXIMUM_TARGET_BITMAP_SIZE ) || ( desiredHeight > MAXIMUM_TARGET_BITMAP_SIZE ) ||
585 ( columnsToPad > MAXIMUM_TARGET_BITMAP_SIZE ) || ( scanlinesToPad > MAXIMUM_TARGET_BITMAP_SIZE ) )
587 DALI_LOG_WARNING( "Image scaling aborted as final dimensions too large (%u, %u).\n", desiredWidth, desiredHeight );
591 // Create a new bitmap with the desired size.
592 BitmapPtr croppedBitmap = Integration::Bitmap::New( Integration::Bitmap::BITMAP_2D_PACKED_PIXELS, ResourcePolicy::OWNED_DISCARD );
593 Integration::Bitmap::PackedPixelsProfile *packedView = croppedBitmap->GetPackedPixelsProfile();
594 DALI_ASSERT_DEBUG( packedView );
595 const Pixel::Format pixelFormat = bitmap->GetPixelFormat();
596 packedView->ReserveBuffer( pixelFormat, desiredWidth, desiredHeight, desiredWidth, desiredHeight );
598 // Add some pre-calculated offsets to the bitmap pointers so this is not done within a loop.
599 // The cropping is added to the source pointer, and the padding is added to the destination.
600 const unsigned int bytesPerPixel = Pixel::GetBytesPerPixel( pixelFormat );
601 const PixelBuffer * const sourcePixels = bitmap->GetBuffer() + ( ( ( ( scanlinesToCrop / 2 ) * inputWidth ) + ( columnsToCrop / 2 ) ) * bytesPerPixel );
602 PixelBuffer * const targetPixels = croppedBitmap->GetBuffer();
603 PixelBuffer * const targetPixelsActive = targetPixels + ( ( ( ( scanlinesToPad / 2 ) * desiredWidth ) + ( columnsToPad / 2 ) ) * bytesPerPixel );
604 DALI_ASSERT_DEBUG( sourcePixels && targetPixels );
606 // Copy the image data to the new bitmap.
607 // Optimize to a single memcpy if the left and right edges don't need a crop or a pad.
608 unsigned int outputSpan( desiredWidth * bytesPerPixel );
609 if( columnsToCrop == 0 && columnsToPad == 0 )
611 memcpy( targetPixelsActive, sourcePixels, ( desiredHeight - scanlinesToPad ) * outputSpan );
615 // The width needs to change (due to either a crop or a pad), so we copy a scanline at a time.
616 // Precalculate any constants to optimize the inner loop.
617 const unsigned int inputSpan( inputWidth * bytesPerPixel );
618 const unsigned int copySpan( ( desiredWidth - columnsToPad ) * bytesPerPixel );
619 const unsigned int scanlinesToCopy( desiredHeight - scanlinesToPad );
621 for( unsigned int y = 0; y < scanlinesToCopy; ++y )
623 memcpy( &targetPixelsActive[ y * outputSpan ], &sourcePixels[ y * inputSpan ], copySpan );
627 // Add vertical or horizontal borders to the final image (if required).
628 desiredDimensions.SetWidth( desiredWidth );
629 desiredDimensions.SetHeight( desiredHeight );
630 AddBorders( croppedBitmap->GetBuffer(), bytesPerPixel, desiredDimensions, ImageDimensions( columnsToPad, scanlinesToPad ) );
631 // Overwrite the loaded bitmap with the cropped version
632 bitmap = croppedBitmap;
639 void AddBorders( PixelBuffer *targetPixels, const unsigned int bytesPerPixel, const ImageDimensions targetDimensions, const ImageDimensions padDimensions )
641 // Assign ints for faster access.
642 unsigned int desiredWidth( targetDimensions.GetWidth() );
643 unsigned int desiredHeight( targetDimensions.GetHeight() );
644 unsigned int columnsToPad( padDimensions.GetWidth() );
645 unsigned int scanlinesToPad( padDimensions.GetHeight() );
646 unsigned int outputSpan( desiredWidth * bytesPerPixel );
648 // Add letterboxing (symmetrical borders) if needed.
649 if( scanlinesToPad > 0 )
651 // Add a top border. Note: This is (deliberately) rounded down if padding is an odd number.
652 memset( targetPixels, BORDER_FILL_VALUE, ( scanlinesToPad / 2 ) * outputSpan );
654 // We subtract scanlinesToPad/2 from scanlinesToPad so that we have the correct
655 // offset for odd numbers (as the top border is 1 pixel smaller in these cases.
656 unsigned int bottomBorderHeight = scanlinesToPad - ( scanlinesToPad / 2 );
659 memset( &targetPixels[ ( desiredHeight - bottomBorderHeight ) * outputSpan ], BORDER_FILL_VALUE, bottomBorderHeight * outputSpan );
661 else if( columnsToPad > 0 )
663 // Add a left and right border.
665 // Pre-calculate span size outside of loop.
666 unsigned int leftBorderSpanWidth( ( columnsToPad / 2 ) * bytesPerPixel );
667 for( unsigned int y = 0; y < desiredHeight; ++y )
669 memset( &targetPixels[ y * outputSpan ], BORDER_FILL_VALUE, leftBorderSpanWidth );
673 // Pre-calculate the initial x offset as it is always the same for a small optimization.
674 // We subtract columnsToPad/2 from columnsToPad so that we have the correct
675 // offset for odd numbers (as the left border is 1 pixel smaller in these cases.
676 unsigned int rightBorderWidth = columnsToPad - ( columnsToPad / 2 );
677 PixelBuffer * const destPixelsRightBorder( targetPixels + ( ( desiredWidth - rightBorderWidth ) * bytesPerPixel ) );
678 unsigned int rightBorderSpanWidth = rightBorderWidth * bytesPerPixel;
680 for( unsigned int y = 0; y < desiredHeight; ++y )
682 memset( &destPixelsRightBorder[ y * outputSpan ], BORDER_FILL_VALUE, rightBorderSpanWidth );
687 Integration::BitmapPtr DownscaleBitmap( Integration::Bitmap& bitmap,
688 ImageDimensions desired,
689 FittingMode::Type fittingMode,
690 SamplingMode::Type samplingMode )
692 // Source dimensions as loaded from resources (e.g. filesystem):
693 const unsigned int bitmapWidth = bitmap.GetImageWidth();
694 const unsigned int bitmapHeight = bitmap.GetImageHeight();
695 // Desired dimensions (the rectangle to fit the source image to):
696 const unsigned int desiredWidth = desired.GetWidth();
697 const unsigned int desiredHeight = desired.GetHeight();
699 BitmapPtr outputBitmap( &bitmap );
701 // If a different size than the raw one has been requested, resize the image:
702 if( bitmap.GetPackedPixelsProfile() &&
703 (desiredWidth > 0.0f) && (desiredHeight > 0.0f) &&
704 ((desiredWidth < bitmapWidth) || (desiredHeight < bitmapHeight)) )
706 const Pixel::Format pixelFormat = bitmap.GetPixelFormat();
708 // Do the fast power of 2 iterated box filter to get to roughly the right side if the filter mode requests that:
709 unsigned int shrunkWidth = -1, shrunkHeight = -1;
710 DownscaleInPlacePow2( bitmap.GetBuffer(), pixelFormat, bitmapWidth, bitmapHeight, desiredWidth, desiredHeight, fittingMode, samplingMode, shrunkWidth, shrunkHeight );
712 // Work out the dimensions of the downscaled bitmap, given the scaling mode and desired dimensions:
713 const ImageDimensions filteredDimensions = FitToScalingMode( ImageDimensions( desiredWidth, desiredHeight ), ImageDimensions( shrunkWidth, shrunkHeight ), fittingMode );
714 const unsigned int filteredWidth = filteredDimensions.GetWidth();
715 const unsigned int filteredHeight = filteredDimensions.GetHeight();
717 // Run a filter to scale down the bitmap if it needs it:
718 bool filtered = false;
719 if( filteredWidth < shrunkWidth || filteredHeight < shrunkHeight )
721 if( samplingMode == SamplingMode::LINEAR || samplingMode == SamplingMode::BOX_THEN_LINEAR ||
722 samplingMode == SamplingMode::NEAREST || samplingMode == SamplingMode::BOX_THEN_NEAREST )
724 outputBitmap = MakeEmptyBitmap( pixelFormat, filteredWidth, filteredHeight );
727 if( samplingMode == SamplingMode::LINEAR || samplingMode == SamplingMode::BOX_THEN_LINEAR )
729 LinearSample( bitmap.GetBuffer(), ImageDimensions(shrunkWidth, shrunkHeight), pixelFormat, outputBitmap->GetBuffer(), filteredDimensions );
733 PointSample( bitmap.GetBuffer(), shrunkWidth, shrunkHeight, pixelFormat, outputBitmap->GetBuffer(), filteredWidth, filteredHeight );
739 // Copy out the 2^x downscaled, box-filtered pixels if no secondary filter (point or linear) was applied:
740 if( filtered == false && ( shrunkWidth < bitmapWidth || shrunkHeight < bitmapHeight ) )
742 outputBitmap = MakeBitmap( bitmap.GetBuffer(), pixelFormat, shrunkWidth, shrunkHeight );
752 * @brief Returns whether to keep box filtering based on whether downscaled dimensions will overshoot the desired ones aty the next step.
753 * @param test Which combination of the two dimensions matter for terminating the filtering.
754 * @param scaledWidth The width of the current downscaled image.
755 * @param scaledHeight The height of the current downscaled image.
756 * @param desiredWidth The target width for the downscaling.
757 * @param desiredHeight The target height for the downscaling.
759 bool ContinueScaling( BoxDimensionTest test, unsigned int scaledWidth, unsigned int scaledHeight, unsigned int desiredWidth, unsigned int desiredHeight )
761 bool keepScaling = false;
762 const unsigned int nextWidth = scaledWidth >> 1u;
763 const unsigned int nextHeight = scaledHeight >> 1u;
765 if( nextWidth >= 1u && nextHeight >= 1u )
769 case BoxDimensionTestEither:
771 keepScaling = nextWidth >= desiredWidth || nextHeight >= desiredHeight;
774 case BoxDimensionTestBoth:
776 keepScaling = nextWidth >= desiredWidth && nextHeight >= desiredHeight;
779 case BoxDimensionTestX:
781 keepScaling = nextWidth >= desiredWidth;
784 case BoxDimensionTestY:
786 keepScaling = nextHeight >= desiredHeight;
796 * @brief A shared implementation of the overall iterative box filter
797 * downscaling algorithm.
799 * Specialise this for particular pixel formats by supplying the number of bytes
800 * per pixel and two functions: one for averaging pairs of neighbouring pixels
801 * on a single scanline, and a second for averaging pixels at corresponding
802 * positions on different scanlines.
806 void (*HalveScanlineInPlace)( unsigned char * const pixels, const unsigned int width ),
807 void (*AverageScanlines) ( const unsigned char * const scanline1, const unsigned char * const __restrict__ scanline2, unsigned char* const outputScanline, const unsigned int width )
809 void DownscaleInPlacePow2Generic( unsigned char * const pixels,
810 const unsigned int inputWidth,
811 const unsigned int inputHeight,
812 const unsigned int desiredWidth,
813 const unsigned int desiredHeight,
814 BoxDimensionTest dimensionTest,
816 unsigned& outHeight )
822 ValidateScalingParameters( inputWidth, inputHeight, desiredWidth, desiredHeight );
824 // Scale the image until it would be smaller than desired, stopping if the
825 // resulting height or width would be less than 1:
826 unsigned int scaledWidth = inputWidth, scaledHeight = inputHeight;
827 while( ContinueScaling( dimensionTest, scaledWidth, scaledHeight, desiredWidth, desiredHeight ) )
829 const unsigned int lastWidth = scaledWidth;
833 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Scaling to %u\t%u.\n", scaledWidth, scaledHeight );
835 const unsigned int lastScanlinePair = scaledHeight - 1;
837 // Scale pairs of scanlines until any spare one at the end is dropped:
838 for( unsigned int y = 0; y <= lastScanlinePair; ++y )
840 // Scale two scanlines horizontally:
841 HalveScanlineInPlace( &pixels[y * 2 * lastWidth * BYTES_PER_PIXEL], lastWidth );
842 HalveScanlineInPlace( &pixels[(y * 2 + 1) * lastWidth * BYTES_PER_PIXEL], lastWidth );
844 // Scale vertical pairs of pixels while the last two scanlines are still warm in
846 // Note, better access patterns for cache-coherence are possible for very large
847 // images but even a 4k wide RGB888 image will use just 24kB of cache (4k pixels
848 // * 3 Bpp * 2 scanlines) for two scanlines on the first iteration.
850 &pixels[y * 2 * lastWidth * BYTES_PER_PIXEL],
851 &pixels[(y * 2 + 1) * lastWidth * BYTES_PER_PIXEL],
852 &pixels[y * scaledWidth * BYTES_PER_PIXEL],
857 ///@note: we could finish off with one of two mutually exclusive passes, one squashing horizontally as far as possible, and the other vertically, if we knew a following cpu point or bilinear filter would restore the desired aspect ratio.
858 outWidth = scaledWidth;
859 outHeight = scaledHeight;
864 void HalveScanlineInPlaceRGB888( unsigned char * const pixels, const unsigned int width )
866 DebugAssertScanlineParameters( pixels, width );
868 const unsigned int lastPair = EvenDown( width - 2 );
870 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
872 // Load all the byte pixel components we need:
873 const unsigned int c11 = pixels[pixel * 3];
874 const unsigned int c12 = pixels[pixel * 3 + 1];
875 const unsigned int c13 = pixels[pixel * 3 + 2];
876 const unsigned int c21 = pixels[pixel * 3 + 3];
877 const unsigned int c22 = pixels[pixel * 3 + 4];
878 const unsigned int c23 = pixels[pixel * 3 + 5];
880 // Save the averaged byte pixel components:
881 pixels[outPixel * 3] = AverageComponent( c11, c21 );
882 pixels[outPixel * 3 + 1] = AverageComponent( c12, c22 );
883 pixels[outPixel * 3 + 2] = AverageComponent( c13, c23 );
887 void HalveScanlineInPlaceRGBA8888( unsigned char * const pixels, const unsigned int width )
889 DebugAssertScanlineParameters( pixels, width );
890 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(pixels) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
892 uint32_t* const alignedPixels = reinterpret_cast<uint32_t*>(pixels);
894 const unsigned int lastPair = EvenDown( width - 2 );
896 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
898 const uint32_t averaged = AveragePixelRGBA8888( alignedPixels[pixel], alignedPixels[pixel + 1] );
899 alignedPixels[outPixel] = averaged;
903 void HalveScanlineInPlaceRGB565( unsigned char * pixels, unsigned int width )
905 DebugAssertScanlineParameters( pixels, width );
906 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(pixels) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
908 uint16_t* const alignedPixels = reinterpret_cast<uint16_t*>(pixels);
910 const unsigned int lastPair = EvenDown( width - 2 );
912 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
914 const uint32_t averaged = AveragePixelRGB565( alignedPixels[pixel], alignedPixels[pixel + 1] );
915 alignedPixels[outPixel] = averaged;
919 void HalveScanlineInPlace2Bytes( unsigned char * const pixels, const unsigned int width )
921 DebugAssertScanlineParameters( pixels, width );
923 const unsigned int lastPair = EvenDown( width - 2 );
925 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
927 // Load all the byte pixel components we need:
928 const unsigned int c11 = pixels[pixel * 2];
929 const unsigned int c12 = pixels[pixel * 2 + 1];
930 const unsigned int c21 = pixels[pixel * 2 + 2];
931 const unsigned int c22 = pixels[pixel * 2 + 3];
933 // Save the averaged byte pixel components:
934 pixels[outPixel * 2] = AverageComponent( c11, c21 );
935 pixels[outPixel * 2 + 1] = AverageComponent( c12, c22 );
939 void HalveScanlineInPlace1Byte( unsigned char * const pixels, const unsigned int width )
941 DebugAssertScanlineParameters( pixels, width );
943 const unsigned int lastPair = EvenDown( width - 2 );
945 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
947 // Load all the byte pixel components we need:
948 const unsigned int c1 = pixels[pixel];
949 const unsigned int c2 = pixels[pixel + 1];
951 // Save the averaged byte pixel component:
952 pixels[outPixel] = AverageComponent( c1, c2 );
957 * @ToDo: Optimise for ARM using a 4 bytes at a time loop wrapped around the single ARMV6 instruction: UHADD8 R4, R0, R5. Note, this is not neon. It runs in the normal integer pipeline so there is no downside like a stall moving between integer and copro, or extra power for clocking-up the idle copro.
958 * if (widthInComponents >= 7) { word32* aligned1 = scanline1 + 3 & 3; word32* aligned1_end = scanline1 + widthInPixels & 3; while(aligned1 < aligned1_end) { UHADD8 *aligned1++, *aligned2++, *alignedoutput++ } .. + 0 to 3 spare pixels at each end.
960 void AverageScanlines1( const unsigned char * const scanline1,
961 const unsigned char * const __restrict__ scanline2,
962 unsigned char* const outputScanline,
963 const unsigned int width )
965 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width );
967 for( unsigned int component = 0; component < width; ++component )
969 outputScanline[component] = AverageComponent( scanline1[component], scanline2[component] );
973 void AverageScanlines2( const unsigned char * const scanline1,
974 const unsigned char * const __restrict__ scanline2,
975 unsigned char* const outputScanline,
976 const unsigned int width )
978 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 2 );
980 for( unsigned int component = 0; component < width * 2; ++component )
982 outputScanline[component] = AverageComponent( scanline1[component], scanline2[component] );
986 void AverageScanlines3( const unsigned char * const scanline1,
987 const unsigned char * const __restrict__ scanline2,
988 unsigned char* const outputScanline,
989 const unsigned int width )
991 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 3 );
993 for( unsigned int component = 0; component < width * 3; ++component )
995 outputScanline[component] = AverageComponent( scanline1[component], scanline2[component] );
999 void AverageScanlinesRGBA8888( const unsigned char * const scanline1,
1000 const unsigned char * const __restrict__ scanline2,
1001 unsigned char * const outputScanline,
1002 const unsigned int width )
1004 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 4 );
1005 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline1) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1006 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline2) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1007 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(outputScanline) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1009 const uint32_t* const alignedScanline1 = reinterpret_cast<const uint32_t*>(scanline1);
1010 const uint32_t* const alignedScanline2 = reinterpret_cast<const uint32_t*>(scanline2);
1011 uint32_t* const alignedOutput = reinterpret_cast<uint32_t*>(outputScanline);
1013 for( unsigned int pixel = 0; pixel < width; ++pixel )
1015 alignedOutput[pixel] = AveragePixelRGBA8888( alignedScanline1[pixel], alignedScanline2[pixel] );
1019 void AverageScanlinesRGB565( const unsigned char * const scanline1,
1020 const unsigned char * const __restrict__ scanline2,
1021 unsigned char * const outputScanline,
1022 const unsigned int width )
1024 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 2 );
1025 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline1) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
1026 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline2) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
1027 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(outputScanline) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
1029 const uint16_t* const alignedScanline1 = reinterpret_cast<const uint16_t*>(scanline1);
1030 const uint16_t* const alignedScanline2 = reinterpret_cast<const uint16_t*>(scanline2);
1031 uint16_t* const alignedOutput = reinterpret_cast<uint16_t*>(outputScanline);
1033 for( unsigned int pixel = 0; pixel < width; ++pixel )
1035 alignedOutput[pixel] = AveragePixelRGB565( alignedScanline1[pixel], alignedScanline2[pixel] );
1039 /// Dispatch to pixel format appropriate box filter downscaling functions.
1040 void DownscaleInPlacePow2( unsigned char * const pixels,
1041 Pixel::Format pixelFormat,
1042 unsigned int inputWidth,
1043 unsigned int inputHeight,
1044 unsigned int desiredWidth,
1045 unsigned int desiredHeight,
1046 FittingMode::Type fittingMode,
1047 SamplingMode::Type samplingMode,
1049 unsigned& outHeight )
1051 outWidth = inputWidth;
1052 outHeight = inputHeight;
1053 // Perform power of 2 iterated 4:1 box filtering if the requested filter mode requires it:
1054 if( samplingMode == SamplingMode::BOX || samplingMode == SamplingMode::BOX_THEN_NEAREST || samplingMode == SamplingMode::BOX_THEN_LINEAR )
1056 // Check the pixel format is one that is supported:
1057 if( pixelFormat == Pixel::RGBA8888 || pixelFormat == Pixel::RGB888 || pixelFormat == Pixel::RGB565 || pixelFormat == Pixel::LA88 || pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1059 const BoxDimensionTest dimensionTest = DimensionTestForScalingMode( fittingMode );
1061 if( pixelFormat == Pixel::RGBA8888 )
1063 Internal::Platform::DownscaleInPlacePow2RGBA8888( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1065 else if( pixelFormat == Pixel::RGB888 )
1067 Internal::Platform::DownscaleInPlacePow2RGB888( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1069 else if( pixelFormat == Pixel::RGB565 )
1071 Internal::Platform::DownscaleInPlacePow2RGB565( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1073 else if( pixelFormat == Pixel::LA88 )
1075 Internal::Platform::DownscaleInPlacePow2ComponentPair( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1077 else if( pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1079 Internal::Platform::DownscaleInPlacePow2SingleBytePerPixel( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1083 DALI_ASSERT_DEBUG( false == "Inner branch conditions don't match outer branch." );
1089 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Bitmap was not shrunk: unsupported pixel format: %u.\n", unsigned(pixelFormat) );
1093 void DownscaleInPlacePow2RGB888( unsigned char *pixels,
1094 unsigned int inputWidth,
1095 unsigned int inputHeight,
1096 unsigned int desiredWidth,
1097 unsigned int desiredHeight,
1098 BoxDimensionTest dimensionTest,
1100 unsigned& outHeight )
1102 DownscaleInPlacePow2Generic<3, HalveScanlineInPlaceRGB888, AverageScanlines3>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1105 void DownscaleInPlacePow2RGBA8888( unsigned char * pixels,
1106 unsigned int inputWidth,
1107 unsigned int inputHeight,
1108 unsigned int desiredWidth,
1109 unsigned int desiredHeight,
1110 BoxDimensionTest dimensionTest,
1112 unsigned& outHeight )
1114 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(pixels) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1115 DownscaleInPlacePow2Generic<4, HalveScanlineInPlaceRGBA8888, AverageScanlinesRGBA8888>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1118 void DownscaleInPlacePow2RGB565( unsigned char * pixels,
1119 unsigned int inputWidth,
1120 unsigned int inputHeight,
1121 unsigned int desiredWidth,
1122 unsigned int desiredHeight,
1123 BoxDimensionTest dimensionTest,
1124 unsigned int& outWidth,
1125 unsigned int& outHeight )
1127 DownscaleInPlacePow2Generic<2, HalveScanlineInPlaceRGB565, AverageScanlinesRGB565>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1131 * @copydoc DownscaleInPlacePow2RGB888
1133 * For 2-byte formats such as lum8alpha8, but not packed 16 bit formats like RGB565.
1135 void DownscaleInPlacePow2ComponentPair( unsigned char *pixels,
1136 unsigned int inputWidth,
1137 unsigned int inputHeight,
1138 unsigned int desiredWidth,
1139 unsigned int desiredHeight,
1140 BoxDimensionTest dimensionTest,
1142 unsigned& outHeight )
1144 DownscaleInPlacePow2Generic<2, HalveScanlineInPlace2Bytes, AverageScanlines2>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1147 void DownscaleInPlacePow2SingleBytePerPixel( unsigned char * pixels,
1148 unsigned int inputWidth,
1149 unsigned int inputHeight,
1150 unsigned int desiredWidth,
1151 unsigned int desiredHeight,
1152 BoxDimensionTest dimensionTest,
1153 unsigned int& outWidth,
1154 unsigned int& outHeight )
1156 DownscaleInPlacePow2Generic<1, HalveScanlineInPlace1Byte, AverageScanlines1>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1163 * @brief Point sample an image to a new resolution (like GL_NEAREST).
1165 * Template is used purely as a type-safe code generator in this one
1166 * compilation unit. Generated code is inlined into type-specific wrapper
1167 * functions below which are exported to rest of module.
1169 template<typename PIXEL>
1170 inline void PointSampleAddressablePixels( const uint8_t * inPixels,
1171 unsigned int inputWidth,
1172 unsigned int inputHeight,
1173 uint8_t * outPixels,
1174 unsigned int desiredWidth,
1175 unsigned int desiredHeight )
1177 DALI_ASSERT_DEBUG( ((desiredWidth <= inputWidth && desiredHeight <= inputHeight) ||
1178 outPixels >= inPixels + inputWidth * inputHeight * sizeof(PIXEL) || outPixels <= inPixels - desiredWidth * desiredHeight * sizeof(PIXEL)) &&
1179 "The input and output buffers must not overlap for an upscaling.");
1180 DALI_ASSERT_DEBUG( ((uint64_t) inPixels) % sizeof(PIXEL) == 0 && "Pixel pointers need to be aligned to the size of the pixels (E.g., 4 bytes for RGBA, 2 bytes for RGB565, ...)." );
1181 DALI_ASSERT_DEBUG( ((uint64_t) outPixels) % sizeof(PIXEL) == 0 && "Pixel pointers need to be aligned to the size of the pixels (E.g., 4 bytes for RGBA, 2 bytes for RGB565, ...)." );
1183 if( inputWidth < 1u || inputHeight < 1u || desiredWidth < 1u || desiredHeight < 1u )
1187 const PIXEL* const inAligned = reinterpret_cast<const PIXEL*>(inPixels);
1188 PIXEL* const outAligned = reinterpret_cast<PIXEL*>(outPixels);
1189 const unsigned int deltaX = (inputWidth << 16u) / desiredWidth;
1190 const unsigned int deltaY = (inputHeight << 16u) / desiredHeight;
1192 unsigned int inY = 0;
1193 for( unsigned int outY = 0; outY < desiredHeight; ++outY )
1195 // Round fixed point y coordinate to nearest integer:
1196 const unsigned int integerY = (inY + (1u << 15u)) >> 16u;
1197 const PIXEL* const inScanline = &inAligned[inputWidth * integerY];
1198 PIXEL* const outScanline = &outAligned[desiredWidth * outY];
1200 DALI_ASSERT_DEBUG( integerY < inputHeight );
1201 DALI_ASSERT_DEBUG( reinterpret_cast<const uint8_t*>(inScanline) < ( inPixels + inputWidth * inputHeight * sizeof(PIXEL) ) );
1202 DALI_ASSERT_DEBUG( reinterpret_cast<uint8_t*>(outScanline) < ( outPixels + desiredWidth * desiredHeight * sizeof(PIXEL) ) );
1204 unsigned int inX = 0;
1205 for( unsigned int outX = 0; outX < desiredWidth; ++outX )
1207 // Round the fixed-point x coordinate to an integer:
1208 const unsigned int integerX = (inX + (1u << 15u)) >> 16u;
1209 const PIXEL* const inPixelAddress = &inScanline[integerX];
1210 const PIXEL pixel = *inPixelAddress;
1211 outScanline[outX] = pixel;
1221 void PointSample4BPP( const unsigned char * inPixels,
1222 unsigned int inputWidth,
1223 unsigned int inputHeight,
1224 unsigned char * outPixels,
1225 unsigned int desiredWidth,
1226 unsigned int desiredHeight )
1228 PointSampleAddressablePixels<uint32_t>( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1232 void PointSample2BPP( const unsigned char * inPixels,
1233 unsigned int inputWidth,
1234 unsigned int inputHeight,
1235 unsigned char * outPixels,
1236 unsigned int desiredWidth,
1237 unsigned int desiredHeight )
1239 PointSampleAddressablePixels<uint16_t>( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1243 void PointSample1BPP( const unsigned char * inPixels,
1244 unsigned int inputWidth,
1245 unsigned int inputHeight,
1246 unsigned char * outPixels,
1247 unsigned int desiredWidth,
1248 unsigned int desiredHeight )
1250 PointSampleAddressablePixels<uint8_t>( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1254 * RGB888 is a special case as its pixels are not aligned addressable units.
1256 void PointSample3BPP( const uint8_t * inPixels,
1257 unsigned int inputWidth,
1258 unsigned int inputHeight,
1259 uint8_t * outPixels,
1260 unsigned int desiredWidth,
1261 unsigned int desiredHeight )
1263 if( inputWidth < 1u || inputHeight < 1u || desiredWidth < 1u || desiredHeight < 1u )
1267 const unsigned int BYTES_PER_PIXEL = 3;
1269 // Generate fixed-point 16.16 deltas in input image coordinates:
1270 const unsigned int deltaX = (inputWidth << 16u) / desiredWidth;
1271 const unsigned int deltaY = (inputHeight << 16u) / desiredHeight;
1273 // Step through output image in whole integer pixel steps while tracking the
1274 // corresponding locations in the input image using 16.16 fixed-point
1276 unsigned int inY = 0; //< 16.16 fixed-point input image y-coord.
1277 for( unsigned int outY = 0; outY < desiredHeight; ++outY )
1279 const unsigned int integerY = (inY + (1u << 15u)) >> 16u;
1280 const uint8_t* const inScanline = &inPixels[inputWidth * integerY * BYTES_PER_PIXEL];
1281 uint8_t* const outScanline = &outPixels[desiredWidth * outY * BYTES_PER_PIXEL];
1282 unsigned int inX = 0; //< 16.16 fixed-point input image x-coord.
1284 for( unsigned int outX = 0; outX < desiredWidth * BYTES_PER_PIXEL; outX += BYTES_PER_PIXEL )
1286 // Round the fixed-point input coordinate to the address of the input pixel to sample:
1287 const unsigned int integerX = (inX + (1u << 15u)) >> 16u;
1288 const uint8_t* const inPixelAddress = &inScanline[integerX * BYTES_PER_PIXEL];
1290 // Issue loads for all pixel color components up-front:
1291 const unsigned int c0 = inPixelAddress[0];
1292 const unsigned int c1 = inPixelAddress[1];
1293 const unsigned int c2 = inPixelAddress[2];
1294 ///@ToDo: Optimise - Benchmark one 32bit load that will be unaligned 2/3 of the time + 3 rotate and masks, versus these three aligned byte loads, versus using an RGB packed, aligned(1) struct and letting compiler pick a strategy.
1296 // Output the pixel components:
1297 outScanline[outX] = c0;
1298 outScanline[outX + 1] = c1;
1299 outScanline[outX + 2] = c2;
1301 // Increment the fixed-point input coordinate:
1309 // Dispatch to a format-appropriate point sampling function:
1310 void PointSample( const unsigned char * inPixels,
1311 unsigned int inputWidth,
1312 unsigned int inputHeight,
1313 Pixel::Format pixelFormat,
1314 unsigned char * outPixels,
1315 unsigned int desiredWidth,
1316 unsigned int desiredHeight )
1318 // Check the pixel format is one that is supported:
1319 if( pixelFormat == Pixel::RGBA8888 || pixelFormat == Pixel::RGB888 || pixelFormat == Pixel::RGB565 || pixelFormat == Pixel::LA88 || pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1321 if( pixelFormat == Pixel::RGB888 )
1323 PointSample3BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1325 else if( pixelFormat == Pixel::RGBA8888 )
1327 PointSample4BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1329 else if( pixelFormat == Pixel::RGB565 || pixelFormat == Pixel::LA88 )
1331 PointSample2BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1333 else if( pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1335 PointSample1BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1339 DALI_ASSERT_DEBUG( false == "Inner branch conditions don't match outer branch." );
1344 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Bitmap was not point sampled: unsupported pixel format: %u.\n", unsigned(pixelFormat) );
1348 // Linear sampling group below
1353 /** @brief Blend 4 pixels together using horizontal and vertical weights. */
1354 inline uint8_t BilinearFilter1BPPByte( uint8_t tl, uint8_t tr, uint8_t bl, uint8_t br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1356 return BilinearFilter1Component( tl, tr, bl, br, fractBlendHorizontal, fractBlendVertical );
1359 /** @copydoc BilinearFilter1BPPByte */
1360 inline Pixel2Bytes BilinearFilter2Bytes( Pixel2Bytes tl, Pixel2Bytes tr, Pixel2Bytes bl, Pixel2Bytes br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1363 pixel.l = BilinearFilter1Component( tl.l, tr.l, bl.l, br.l, fractBlendHorizontal, fractBlendVertical );
1364 pixel.a = BilinearFilter1Component( tl.a, tr.a, bl.a, br.a, fractBlendHorizontal, fractBlendVertical );
1368 /** @copydoc BilinearFilter1BPPByte */
1369 inline Pixel3Bytes BilinearFilterRGB888( Pixel3Bytes tl, Pixel3Bytes tr, Pixel3Bytes bl, Pixel3Bytes br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1372 pixel.r = BilinearFilter1Component( tl.r, tr.r, bl.r, br.r, fractBlendHorizontal, fractBlendVertical );
1373 pixel.g = BilinearFilter1Component( tl.g, tr.g, bl.g, br.g, fractBlendHorizontal, fractBlendVertical );
1374 pixel.b = BilinearFilter1Component( tl.b, tr.b, bl.b, br.b, fractBlendHorizontal, fractBlendVertical );
1378 /** @copydoc BilinearFilter1BPPByte */
1379 inline PixelRGB565 BilinearFilterRGB565( PixelRGB565 tl, PixelRGB565 tr, PixelRGB565 bl, PixelRGB565 br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1381 const PixelRGB565 pixel = (BilinearFilter1Component( tl >> 11u, tr >> 11u, bl >> 11u, br >> 11u, fractBlendHorizontal, fractBlendVertical ) << 11u) +
1382 (BilinearFilter1Component( (tl >> 5u) & 63u, (tr >> 5u) & 63u, (bl >> 5u) & 63u, (br >> 5u) & 63u, fractBlendHorizontal, fractBlendVertical ) << 5u) +
1383 BilinearFilter1Component( tl & 31u, tr & 31u, bl & 31u, br & 31u, fractBlendHorizontal, fractBlendVertical );
1387 /** @copydoc BilinearFilter1BPPByte */
1388 inline Pixel4Bytes BilinearFilter4Bytes( Pixel4Bytes tl, Pixel4Bytes tr, Pixel4Bytes bl, Pixel4Bytes br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1391 pixel.r = BilinearFilter1Component( tl.r, tr.r, bl.r, br.r, fractBlendHorizontal, fractBlendVertical );
1392 pixel.g = BilinearFilter1Component( tl.g, tr.g, bl.g, br.g, fractBlendHorizontal, fractBlendVertical );
1393 pixel.b = BilinearFilter1Component( tl.b, tr.b, bl.b, br.b, fractBlendHorizontal, fractBlendVertical );
1394 pixel.a = BilinearFilter1Component( tl.a, tr.a, bl.a, br.a, fractBlendHorizontal, fractBlendVertical );
1399 * @brief Generic version of bilinear sampling image resize function.
1400 * @note Limited to one compilation unit and exposed through type-specific
1401 * wrapper functions below.
1405 PIXEL (*BilinearFilter) ( PIXEL tl, PIXEL tr, PIXEL bl, PIXEL br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical ),
1406 bool DEBUG_ASSERT_ALIGNMENT
1408 inline void LinearSampleGeneric( const unsigned char * __restrict__ inPixels,
1409 ImageDimensions inputDimensions,
1410 unsigned char * __restrict__ outPixels,
1411 ImageDimensions desiredDimensions )
1413 const unsigned int inputWidth = inputDimensions.GetWidth();
1414 const unsigned int inputHeight = inputDimensions.GetHeight();
1415 const unsigned int desiredWidth = desiredDimensions.GetWidth();
1416 const unsigned int desiredHeight = desiredDimensions.GetHeight();
1418 DALI_ASSERT_DEBUG( ((outPixels >= inPixels + inputWidth * inputHeight * sizeof(PIXEL)) ||
1419 (inPixels >= outPixels + desiredWidth * desiredHeight * sizeof(PIXEL))) &&
1420 "Input and output buffers cannot overlap.");
1421 if( DEBUG_ASSERT_ALIGNMENT )
1423 DALI_ASSERT_DEBUG( ((uint64_t) inPixels) % sizeof(PIXEL) == 0 && "Pixel pointers need to be aligned to the size of the pixels (E.g., 4 bytes for RGBA, 2 bytes for RGB565, ...)." );
1424 DALI_ASSERT_DEBUG( ((uint64_t) outPixels) % sizeof(PIXEL) == 0 && "Pixel pointers need to be aligned to the size of the pixels (E.g., 4 bytes for RGBA, 2 bytes for RGB565, ...)." );
1427 if( inputWidth < 1u || inputHeight < 1u || desiredWidth < 1u || desiredHeight < 1u )
1431 const PIXEL* const inAligned = reinterpret_cast<const PIXEL*>(inPixels);
1432 PIXEL* const outAligned = reinterpret_cast<PIXEL*>(outPixels);
1433 const unsigned int deltaX = (inputWidth << 16u) / desiredWidth;
1434 const unsigned int deltaY = (inputHeight << 16u) / desiredHeight;
1436 unsigned int inY = 0;
1437 for( unsigned int outY = 0; outY < desiredHeight; ++outY )
1439 PIXEL* const outScanline = &outAligned[desiredWidth * outY];
1441 // Find the two scanlines to blend and the weight to blend with:
1442 const unsigned int integerY1 = inY >> 16u;
1443 const unsigned int integerY2 = integerY1 >= inputHeight ? integerY1 : integerY1 + 1;
1444 const unsigned int inputYWeight = inY & 65535u;
1446 DALI_ASSERT_DEBUG( integerY1 < inputHeight );
1447 DALI_ASSERT_DEBUG( integerY2 < inputHeight );
1449 const PIXEL* const inScanline1 = &inAligned[inputWidth * integerY1];
1450 const PIXEL* const inScanline2 = &inAligned[inputWidth * integerY2];
1452 unsigned int inX = 0;
1453 for( unsigned int outX = 0; outX < desiredWidth; ++outX )
1455 // Work out the two pixel scanline offsets for this cluster of four samples:
1456 const unsigned int integerX1 = inX >> 16u;
1457 const unsigned int integerX2 = integerX1 >= inputWidth ? integerX1 : integerX1 + 1;
1459 // Execute the loads:
1460 const PIXEL pixel1 = inScanline1[integerX1];
1461 const PIXEL pixel2 = inScanline2[integerX1];
1462 const PIXEL pixel3 = inScanline1[integerX2];
1463 const PIXEL pixel4 = inScanline2[integerX2];
1464 ///@ToDo Optimise - for 1 and 2 and 4 byte types to execute a single 2, 4, or 8 byte load per pair (caveat clamping) and let half of them be unaligned.
1466 // Weighted bilinear filter:
1467 const unsigned int inputXWeight = inX & 65535u;
1468 outScanline[outX] = BilinearFilter( pixel1, pixel3, pixel2, pixel4, inputXWeight, inputYWeight );
1478 // Format-specific linear scaling instantiations:
1480 void LinearSample1BPP( const unsigned char * __restrict__ inPixels,
1481 ImageDimensions inputDimensions,
1482 unsigned char * __restrict__ outPixels,
1483 ImageDimensions desiredDimensions )
1485 LinearSampleGeneric<uint8_t, BilinearFilter1BPPByte, false>( inPixels, inputDimensions, outPixels, desiredDimensions );
1488 void LinearSample2BPP( const unsigned char * __restrict__ inPixels,
1489 ImageDimensions inputDimensions,
1490 unsigned char * __restrict__ outPixels,
1491 ImageDimensions desiredDimensions )
1493 LinearSampleGeneric<Pixel2Bytes, BilinearFilter2Bytes, true>( inPixels, inputDimensions, outPixels, desiredDimensions );
1496 void LinearSampleRGB565( const unsigned char * __restrict__ inPixels,
1497 ImageDimensions inputDimensions,
1498 unsigned char * __restrict__ outPixels,
1499 ImageDimensions desiredDimensions )
1501 LinearSampleGeneric<PixelRGB565, BilinearFilterRGB565, true>( inPixels, inputDimensions, outPixels, desiredDimensions );
1504 void LinearSample3BPP( const unsigned char * __restrict__ inPixels,
1505 ImageDimensions inputDimensions,
1506 unsigned char * __restrict__ outPixels,
1507 ImageDimensions desiredDimensions )
1509 LinearSampleGeneric<Pixel3Bytes, BilinearFilterRGB888, false>( inPixels, inputDimensions, outPixels, desiredDimensions );
1512 void LinearSample4BPP( const unsigned char * __restrict__ inPixels,
1513 ImageDimensions inputDimensions,
1514 unsigned char * __restrict__ outPixels,
1515 ImageDimensions desiredDimensions )
1517 LinearSampleGeneric<Pixel4Bytes, BilinearFilter4Bytes, true>( inPixels, inputDimensions, outPixels, desiredDimensions );
1520 void LanczosSample4BPP( const unsigned char * __restrict__ inPixels,
1521 ImageDimensions inputDimensions,
1522 unsigned char * __restrict__ outPixels,
1523 ImageDimensions desiredDimensions )
1525 // Got from the test.cpp of the ImageResampler lib.
1526 const float ONE_DIV_255 = 1.0f / 255.0f;
1527 const int MAX_UNSIGNED_CHAR = std::numeric_limits<uint8_t>::max();
1528 const int LINEAR_TO_SRGB_TABLE_SIZE = 4096;
1529 const int ALPHA_CHANNEL = 3;
1530 const int NUMBER_OF_CHANNELS = 4;
1532 float srgbToLinear[MAX_UNSIGNED_CHAR + 1];
1533 for( int i = 0; i <= MAX_UNSIGNED_CHAR; ++i )
1535 srgbToLinear[i] = pow( static_cast<float>( i ) * ONE_DIV_255, DEFAULT_SOURCE_GAMMA );
1538 unsigned char linearToSrgb[LINEAR_TO_SRGB_TABLE_SIZE];
1540 const float invLinearToSrgbTableSize = 1.0f / static_cast<float>( LINEAR_TO_SRGB_TABLE_SIZE );
1541 const float invSourceGamma = 1.0f / DEFAULT_SOURCE_GAMMA;
1543 for( int i = 0; i < LINEAR_TO_SRGB_TABLE_SIZE; ++i )
1545 int k = static_cast<int>( 255.0f * pow( static_cast<float>( i ) * invLinearToSrgbTableSize, invSourceGamma ) + 0.5f );
1550 else if( k > MAX_UNSIGNED_CHAR )
1552 k = MAX_UNSIGNED_CHAR;
1554 linearToSrgb[i] = static_cast<unsigned char>( k );
1557 Resampler* resamplers[NUMBER_OF_CHANNELS] = { 0 };
1558 Vector<float> samples[NUMBER_OF_CHANNELS];
1560 const int srcWidth = inputDimensions.GetWidth();
1561 const int srcHeight = inputDimensions.GetHeight();
1562 const int dstWidth = desiredDimensions.GetWidth();
1563 const int dstHeight = desiredDimensions.GetHeight();
1565 // Now create a Resampler instance for each component to process. The first instance will create new contributor tables, which are shared by the resamplers
1566 // used for the other components (a memory and slight cache efficiency optimization).
1567 resamplers[0] = new Resampler( srcWidth,
1571 Resampler::BOUNDARY_CLAMP,
1572 0.0f, // sample_low,
1573 1.0f, // sample_high. Clamp output samples to specified range, or disable clamping if sample_low >= sample_high.
1574 FILTER_TYPE, // The type of filter. Currently Lanczos.
1576 NULL, // Pclist_y. Optional pointers to contributor lists from another instance of a Resampler.
1577 FILTER_SCALE, // src_x_ofs,
1578 FILTER_SCALE ); // src_y_ofs. Offset input image by specified amount (fractional values okay).
1579 samples[0].Resize( srcWidth );
1580 for( int i = 1; i < NUMBER_OF_CHANNELS; ++i )
1582 resamplers[i] = new Resampler( srcWidth,
1586 Resampler::BOUNDARY_CLAMP,
1590 resamplers[0]->get_clist_x(),
1591 resamplers[0]->get_clist_y(),
1594 samples[i].Resize( srcWidth );
1597 const int srcPitch = srcWidth * NUMBER_OF_CHANNELS;
1598 const int dstPitch = dstWidth * NUMBER_OF_CHANNELS;
1601 for( int srcY = 0; srcY < srcHeight; ++srcY )
1603 const unsigned char* pSrc = &inPixels[srcY * srcPitch];
1605 for( int x = 0; x < srcWidth; ++x )
1607 for( int c = 0; c < NUMBER_OF_CHANNELS; ++c )
1609 if( c == ALPHA_CHANNEL )
1611 samples[c][x] = *pSrc++ * ONE_DIV_255;
1615 samples[c][x] = srgbToLinear[*pSrc++];
1620 for( int c = 0; c < NUMBER_OF_CHANNELS; ++c )
1622 if( !resamplers[c]->put_line( &samples[c][0] ) )
1624 DALI_ASSERT_DEBUG( !"Out of memory" );
1631 for( compIndex = 0; compIndex < NUMBER_OF_CHANNELS; ++compIndex )
1633 const float* pOutputSamples = resamplers[compIndex]->get_line();
1634 if( !pOutputSamples )
1639 const bool isAlphaChannel = ( compIndex == ALPHA_CHANNEL );
1640 DALI_ASSERT_DEBUG( dstY < dstHeight );
1641 unsigned char* pDst = &outPixels[dstY * dstPitch + compIndex];
1643 for( int x = 0; x < dstWidth; ++x )
1645 if( isAlphaChannel )
1647 int c = static_cast<int>( 255.0f * pOutputSamples[x] + 0.5f );
1652 else if( c > MAX_UNSIGNED_CHAR )
1654 c = MAX_UNSIGNED_CHAR;
1656 *pDst = static_cast<unsigned char>( c );
1660 int j = static_cast<int>( LINEAR_TO_SRGB_TABLE_SIZE * pOutputSamples[x] + 0.5f );
1665 else if( j >= LINEAR_TO_SRGB_TABLE_SIZE )
1667 j = LINEAR_TO_SRGB_TABLE_SIZE - 1;
1669 *pDst = linearToSrgb[j];
1672 pDst += NUMBER_OF_CHANNELS;
1675 if( compIndex < NUMBER_OF_CHANNELS )
1684 // Delete the resamplers.
1685 for( int i = 0; i < NUMBER_OF_CHANNELS; ++i )
1687 delete resamplers[i];
1691 // Dispatch to a format-appropriate linear sampling function:
1692 void LinearSample( const unsigned char * __restrict__ inPixels,
1693 ImageDimensions inDimensions,
1694 Pixel::Format pixelFormat,
1695 unsigned char * __restrict__ outPixels,
1696 ImageDimensions outDimensions )
1698 // Check the pixel format is one that is supported:
1699 if( pixelFormat == Pixel::RGB888 || pixelFormat == Pixel::RGBA8888 || pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 || pixelFormat == Pixel::LA88 || pixelFormat == Pixel::RGB565 )
1701 if( pixelFormat == Pixel::RGB888 )
1703 LinearSample3BPP( inPixels, inDimensions, outPixels, outDimensions );
1705 else if( pixelFormat == Pixel::RGBA8888 )
1707 LinearSample4BPP( inPixels, inDimensions, outPixels, outDimensions );
1709 else if( pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1711 LinearSample1BPP( inPixels, inDimensions, outPixels, outDimensions );
1713 else if( pixelFormat == Pixel::LA88 )
1715 LinearSample2BPP( inPixels, inDimensions, outPixels, outDimensions );
1717 else if ( pixelFormat == Pixel::RGB565 )
1719 LinearSampleRGB565( inPixels, inDimensions, outPixels, outDimensions );
1723 DALI_ASSERT_DEBUG( false == "Inner branch conditions don't match outer branch." );
1728 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Bitmap was not linear sampled: unsupported pixel format: %u.\n", unsigned(pixelFormat) );
1732 } /* namespace Platform */
1733 } /* namespace Internal */
1734 } /* namespace Dali */