2 * Copyright (c) 2017 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>
29 #include <image-loading.h>
43 // The BORDER_FILL_VALUE is a single byte value that is used for horizontal and vertical borders.
44 // A value of 0x00 gives us transparency for pixel buffers with an alpha channel, or black otherwise.
45 // We can optionally use a Vector4 color here, but at reduced fill speed.
46 const uint8_t BORDER_FILL_VALUE( 0x00 );
47 // A maximum size limit for newly created bitmaps. ( 1u << 16 ) - 1 is chosen as we are using 16bit words for dimensions.
48 const unsigned int MAXIMUM_TARGET_BITMAP_SIZE( ( 1u << 16 ) - 1 );
50 // Constants used by the ImageResampler.
51 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.
52 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.
53 const Resampler::Filter FILTER_TYPE = Resampler::LANCZOS4; ///< Default filter used in the Resampler() function. Possible Lanczos filters are: lanczos3, lanczos4, lanczos6, lanczos12
55 using Integration::Bitmap;
56 using Integration::BitmapPtr;
57 typedef unsigned char PixelBuffer;
60 * @brief 4 byte pixel structure.
68 } __attribute__((packed, aligned(4))); //< Tell the compiler it is okay to use a single 32 bit load.
71 * @brief RGB888 pixel structure.
78 } __attribute__((packed, aligned(1)));
81 * @brief RGB565 pixel typedefed from a short.
83 * Access fields by manual shifting and masking.
85 typedef uint16_t PixelRGB565;
88 * @brief a Pixel composed of two independent byte components.
94 } __attribute__((packed, aligned(2))); //< Tell the compiler it is okay to use a single 16 bit load.
97 #if defined(DEBUG_ENABLED)
99 * Disable logging of image operations or make it verbose from the commandline
100 * as follows (e.g., for dali demo app):
102 * LOG_IMAGE_OPERATIONS=0 dali-demo #< off
103 * LOG_IMAGE_OPERATIONS=3 dali-demo #< on, verbose
106 Debug::Filter* gImageOpsLogFilter = Debug::Filter::New( Debug::NoLogging, false, "LOG_IMAGE_OPERATIONS" );
109 /** @return The greatest even number less than or equal to the argument. */
110 inline unsigned int EvenDown( const unsigned int a )
112 const unsigned int evened = a & ~1u;
117 * @brief Log bad parameters.
119 void ValidateScalingParameters( const unsigned int inputWidth,
120 const unsigned int inputHeight,
121 const unsigned int desiredWidth,
122 const unsigned int desiredHeight )
124 if( desiredWidth > inputWidth || desiredHeight > inputHeight )
126 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Upscaling not supported (%u, %u -> %u, %u).\n", inputWidth, inputHeight, desiredWidth, desiredHeight );
129 if( desiredWidth == 0u || desiredHeight == 0u )
131 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Downscaling to a zero-area target is pointless.\n" );
134 if( inputWidth == 0u || inputHeight == 0u )
136 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Zero area images cannot be scaled\n" );
141 * @brief Do debug assertions common to all scanline halving functions.
142 * @note Inline and in anon namespace so should boil away in release builds.
144 inline void DebugAssertScanlineParameters( const uint8_t * const pixels, const unsigned int width )
146 DALI_ASSERT_DEBUG( pixels && "Null pointer." );
147 DALI_ASSERT_DEBUG( width > 1u && "Can't average fewer than two pixels." );
148 DALI_ASSERT_DEBUG( width < 131072u && "Unusually wide image: are you sure you meant to pass that value in?" );
152 * @brief Assertions on params to functions averaging pairs of scanlines.
153 * @note Inline as intended to boil away in release.
155 inline void DebugAssertDualScanlineParameters( const uint8_t * const scanline1,
156 const uint8_t * const scanline2,
157 uint8_t* const outputScanline,
158 const size_t widthInComponents )
160 DALI_ASSERT_DEBUG( scanline1 && "Null pointer." );
161 DALI_ASSERT_DEBUG( scanline2 && "Null pointer." );
162 DALI_ASSERT_DEBUG( outputScanline && "Null pointer." );
163 DALI_ASSERT_DEBUG( ((scanline1 >= scanline2 + widthInComponents) || (scanline2 >= scanline1 + widthInComponents )) && "Scanlines alias." );
164 DALI_ASSERT_DEBUG( ((outputScanline >= (scanline2 + widthInComponents)) || (scanline2 >= (scanline1 + widthInComponents))) && "Scanline 2 aliases output." );
168 * @brief Converts a scaling mode to the definition of which dimensions matter when box filtering as a part of that mode.
170 BoxDimensionTest DimensionTestForScalingMode( FittingMode::Type fittingMode )
172 BoxDimensionTest dimensionTest;
173 dimensionTest = BoxDimensionTestEither;
175 switch( fittingMode )
177 // Shrink to fit attempts to make one or zero dimensions smaller than the
178 // desired dimensions and one or two dimensions exactly the same as the desired
179 // ones, so as long as one dimension is larger than the desired size, box
180 // filtering can continue even if the second dimension is smaller than the
181 // desired dimensions:
182 case FittingMode::SHRINK_TO_FIT:
184 dimensionTest = BoxDimensionTestEither;
187 // Scale to fill mode keeps both dimensions at least as large as desired:
188 case FittingMode::SCALE_TO_FILL:
190 dimensionTest = BoxDimensionTestBoth;
193 // Y dimension is irrelevant when downscaling in FIT_WIDTH mode:
194 case FittingMode::FIT_WIDTH:
196 dimensionTest = BoxDimensionTestX;
199 // X Dimension is ignored by definition in FIT_HEIGHT mode:
200 case FittingMode::FIT_HEIGHT:
202 dimensionTest = BoxDimensionTestY;
207 return dimensionTest;
211 * @brief Work out the dimensions for a uniform scaling of the input to map it
212 * into the target while effecting ShinkToFit scaling mode.
214 ImageDimensions FitForShrinkToFit( ImageDimensions target, ImageDimensions source )
216 // Scale the input by the least extreme of the two dimensions:
217 const float widthScale = target.GetX() / float(source.GetX());
218 const float heightScale = target.GetY() / float(source.GetY());
219 const float scale = widthScale < heightScale ? widthScale : heightScale;
221 // Do no scaling at all if the result would increase area:
227 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
231 * @brief Work out the dimensions for a uniform scaling of the input to map it
232 * into the target while effecting SCALE_TO_FILL scaling mode.
233 * @note An image scaled into the output dimensions will need either top and
234 * bottom or left and right to be cropped away unless the source was pre-cropped
235 * to match the destination aspect ratio.
237 ImageDimensions FitForScaleToFill( ImageDimensions target, ImageDimensions source )
239 DALI_ASSERT_DEBUG( source.GetX() > 0 && source.GetY() > 0 && "Zero-area rectangles should not be passed-in" );
240 // Scale the input by the least extreme of the two dimensions:
241 const float widthScale = target.GetX() / float(source.GetX());
242 const float heightScale = target.GetY() / float(source.GetY());
243 const float scale = widthScale > heightScale ? widthScale : heightScale;
245 // Do no scaling at all if the result would increase area:
251 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
255 * @brief Work out the dimensions for a uniform scaling of the input to map it
256 * into the target while effecting FIT_WIDTH scaling mode.
258 ImageDimensions FitForFitWidth( ImageDimensions target, ImageDimensions source )
260 DALI_ASSERT_DEBUG( source.GetX() > 0 && "Cant fit a zero-dimension rectangle." );
261 const float scale = target.GetX() / float(source.GetX());
263 // Do no scaling at all if the result would increase area:
268 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
272 * @brief Work out the dimensions for a uniform scaling of the input to map it
273 * into the target while effecting FIT_HEIGHT scaling mode.
275 ImageDimensions FitForFitHeight( ImageDimensions target, ImageDimensions source )
277 DALI_ASSERT_DEBUG( source.GetY() > 0 && "Cant fit a zero-dimension rectangle." );
278 const float scale = target.GetY() / float(source.GetY());
280 // Do no scaling at all if the result would increase area:
286 return ImageDimensions( source.GetX() * scale + 0.5f, source.GetY() * scale + 0.5f );
290 * @brief Generate the rectangle to use as the target of a pixel sampling pass
291 * (e.g., nearest or linear).
293 ImageDimensions FitToScalingMode( ImageDimensions requestedSize, ImageDimensions sourceSize, FittingMode::Type fittingMode )
295 ImageDimensions fitDimensions;
296 switch( fittingMode )
298 case FittingMode::SHRINK_TO_FIT:
300 fitDimensions = FitForShrinkToFit( requestedSize, sourceSize );
303 case FittingMode::SCALE_TO_FILL:
305 fitDimensions = FitForScaleToFill( requestedSize, sourceSize );
308 case FittingMode::FIT_WIDTH:
310 fitDimensions = FitForFitWidth( requestedSize, sourceSize );
313 case FittingMode::FIT_HEIGHT:
315 fitDimensions = FitForFitHeight( requestedSize, sourceSize );
320 return fitDimensions;
324 * @brief Calculate the number of lines on the X and Y axis that need to be
325 * either added or removed with repect to the specified fitting mode.
326 * (e.g., nearest or linear).
327 * @param[in] sourceSize The size of the source image
328 * @param[in] fittingMode The fitting mode to use
329 * @param[in/out] requestedSize The target size that the image will be fitted to.
330 * If the source image is smaller than the requested size, the source is not scaled up.
331 * So we reduce the target size while keeping aspect by lowering resolution.
332 * @param[out] scanlinesToCrop The number of scanlines to remove from the image (can be negative to represent Y borders required)
333 * @param[out] columnsToCrop The number of columns to remove from the image (can be negative to represent X borders required)
335 void CalculateBordersFromFittingMode( ImageDimensions sourceSize, FittingMode::Type fittingMode, ImageDimensions& requestedSize, int& scanlinesToCrop, int& columnsToCrop )
337 const unsigned int sourceWidth( sourceSize.GetWidth() );
338 const unsigned int sourceHeight( sourceSize.GetHeight() );
339 const float targetAspect( static_cast< float >( requestedSize.GetWidth() ) / static_cast< float >( requestedSize.GetHeight() ) );
343 switch( fittingMode )
345 case FittingMode::FIT_WIDTH:
347 finalWidth = sourceWidth;
348 finalHeight = static_cast< float >( sourceWidth ) / targetAspect;
351 scanlinesToCrop = -( finalHeight - sourceHeight );
355 case FittingMode::FIT_HEIGHT:
357 finalWidth = static_cast< float >( sourceHeight ) * targetAspect;
358 finalHeight = sourceHeight;
360 columnsToCrop = -( finalWidth - sourceWidth );
365 case FittingMode::SHRINK_TO_FIT:
367 const float sourceAspect( static_cast< float >( sourceWidth ) / static_cast< float >( sourceHeight ) );
368 if( sourceAspect > targetAspect )
370 finalWidth = sourceWidth;
371 finalHeight = static_cast< float >( sourceWidth ) / targetAspect;
374 scanlinesToCrop = -( finalHeight - sourceHeight );
378 finalWidth = static_cast< float >( sourceHeight ) * targetAspect;
379 finalHeight = sourceHeight;
381 columnsToCrop = -( finalWidth - sourceWidth );
387 case FittingMode::SCALE_TO_FILL:
389 const float sourceAspect( static_cast< float >( sourceWidth ) / static_cast< float >( sourceHeight ) );
390 if( sourceAspect > targetAspect )
392 finalWidth = static_cast< float >( sourceHeight ) * targetAspect;
393 finalHeight = sourceHeight;
395 columnsToCrop = -( finalWidth - sourceWidth );
400 finalWidth = sourceWidth;
401 finalHeight = static_cast< float >( sourceWidth ) / targetAspect;
404 scanlinesToCrop = -( finalHeight - sourceHeight );
410 requestedSize.SetWidth( finalWidth );
411 requestedSize.SetHeight( finalHeight );
415 * @brief Construct a bitmap with format and dimensions requested.
417 BitmapPtr MakeEmptyBitmap( Pixel::Format pixelFormat, unsigned int width, unsigned int height )
419 DALI_ASSERT_DEBUG( Pixel::GetBytesPerPixel(pixelFormat) && "Compressed formats not supported." );
421 // Allocate a pixel buffer to hold the image passed in:
422 Integration::BitmapPtr newBitmap = Integration::Bitmap::New( Integration::Bitmap::BITMAP_2D_PACKED_PIXELS, ResourcePolicy::OWNED_DISCARD );
423 newBitmap->GetPackedPixelsProfile()->ReserveBuffer( pixelFormat, width, height, width, height );
428 * @brief Construct a bitmap object from a copy of the pixel array passed in.
430 BitmapPtr MakeBitmap( const uint8_t * const pixels, Pixel::Format pixelFormat, unsigned int width, unsigned int height )
432 DALI_ASSERT_DEBUG( pixels && "Null bitmap buffer to copy." );
434 // Allocate a pixel buffer to hold the image passed in:
435 Integration::BitmapPtr newBitmap = MakeEmptyBitmap( pixelFormat, width, height );
437 // Copy over the pixels from the downscaled image that was generated in-place in the pixel buffer of the input bitmap:
438 memcpy( newBitmap->GetBuffer(), pixels, width * height * Pixel::GetBytesPerPixel( pixelFormat ) );
443 * @brief Work out the desired width and height, accounting for zeros.
445 * @param[in] bitmapWidth Width of image before processing.
446 * @param[in] bitmapHeight Height of image before processing.
447 * @param[in] requestedWidth Width of area to scale image into. Can be zero.
448 * @param[in] requestedHeight Height of area to scale image into. Can be zero.
449 * @return Dimensions of area to scale image into after special rules are applied.
451 ImageDimensions CalculateDesiredDimensions( unsigned int bitmapWidth, unsigned int bitmapHeight, unsigned int requestedWidth, unsigned int requestedHeight )
453 unsigned int maxSize = Dali::GetMaxTextureSize();
455 // If no dimensions have been requested, default to the source ones:
456 if( requestedWidth == 0 && requestedHeight == 0 )
458 return ImageDimensions( std::min( bitmapWidth, maxSize ), std::min( bitmapHeight, maxSize ) );
461 // If both dimensions have values requested, use them both:
462 if( requestedWidth != 0 && requestedHeight != 0 )
464 return ImageDimensions( std::min( requestedWidth, maxSize ), std::min( requestedHeight, maxSize ) );
467 // Only one of the dimensions has been requested. Calculate the other from
468 // the requested one and the source image aspect ratio:
469 if( requestedWidth != 0 )
471 requestedWidth = std::min( requestedWidth, maxSize );
472 return ImageDimensions( requestedWidth, bitmapHeight / float(bitmapWidth) * requestedWidth + 0.5f );
475 requestedHeight = std::min( requestedHeight, maxSize );
476 return ImageDimensions( bitmapWidth / float(bitmapHeight) * requestedHeight + 0.5f, requestedHeight );
479 } // namespace - unnamed
481 ImageDimensions CalculateDesiredDimensions( ImageDimensions rawDimensions, ImageDimensions requestedDimensions )
483 return CalculateDesiredDimensions( rawDimensions.GetWidth(), rawDimensions.GetHeight(), requestedDimensions.GetWidth(), requestedDimensions.GetHeight() ) ;
487 * @brief Apply cropping and padding for specified fitting mode.
489 * Once the bitmap has been (optionally) downscaled to an appropriate size, this method performs alterations
490 * based on the fitting mode.
492 * This will add vertical or horizontal borders if necessary.
493 * Crop the source image data vertically or horizontally if necessary.
494 * The aspect of the source image is preserved.
495 * If the source image is smaller than the desired size, the algorithm will modify the the newly created
496 * bitmaps dimensions to only be as large as necessary, as a memory saving optimization. This will cause
497 * GPU scaling to be performed at render time giving the same result with less texture traversal.
499 * @param[in] bitmap The source bitmap to perform modifications on.
500 * @param[in] desiredDimensions The target dimensions to aim to fill based on the fitting mode.
501 * @param[in] fittingMode The fitting mode to use.
503 * @return A new bitmap with the padding and cropping required for fitting mode applied.
504 * If no modification is needed or possible, the passed in bitmap is returned.
506 Integration::BitmapPtr CropAndPadForFittingMode( Integration::BitmapPtr bitmap, ImageDimensions desiredDimensions, FittingMode::Type fittingMode );
509 * @brief Adds horizontal or vertical borders to the source image.
511 * @param[in] targetPixels The destination image pointer to draw the borders on.
512 * @param[in] bytesPerPixel The number of bytes per pixel of the target pixel buffer.
513 * @param[in] targetDimensions The dimensions of the destination image.
514 * @param[in] padDimensions The columns and scanlines to pad with borders.
516 void AddBorders( PixelBuffer *targetPixels, const unsigned int bytesPerPixel, const ImageDimensions targetDimensions, const ImageDimensions padDimensions );
518 BitmapPtr ApplyAttributesToBitmap( BitmapPtr bitmap, ImageDimensions dimensions, FittingMode::Type fittingMode, SamplingMode::Type samplingMode )
522 // Calculate the desired box, accounting for a possible zero component:
523 const ImageDimensions desiredDimensions = CalculateDesiredDimensions( bitmap->GetImageWidth(), bitmap->GetImageHeight(), dimensions.GetWidth(), dimensions.GetHeight() );
525 // If a different size than the raw one has been requested, resize the image
526 // maximally using a repeated box filter without making it smaller than the
527 // requested size in either dimension:
528 bitmap = DownscaleBitmap( *bitmap, desiredDimensions, fittingMode, samplingMode );
530 // Cut the bitmap according to the desired width and height so that the
531 // resulting bitmap has the same aspect ratio as the desired dimensions.
532 // Add crop and add borders if necessary depending on fitting mode.
533 if( bitmap && bitmap->GetPackedPixelsProfile() )
535 bitmap = CropAndPadForFittingMode( bitmap, desiredDimensions, fittingMode );
538 // Examine the image pixels remaining after cropping and scaling to see if all
539 // are opaque, allowing faster rendering, or some have non-1.0 alpha:
540 if( bitmap && bitmap->GetPackedPixelsProfile() && Pixel::HasAlpha( bitmap->GetPixelFormat() ) )
542 bitmap->GetPackedPixelsProfile()->TestForTransparency();
549 BitmapPtr CropAndPadForFittingMode( BitmapPtr bitmap, ImageDimensions desiredDimensions, FittingMode::Type fittingMode )
551 const unsigned int inputWidth = bitmap->GetImageWidth();
552 const unsigned int inputHeight = bitmap->GetImageHeight();
554 if( desiredDimensions.GetWidth() < 1u || desiredDimensions.GetHeight() < 1u )
556 DALI_LOG_WARNING( "Image scaling aborted as desired dimensions too small (%u, %u).\n", desiredDimensions.GetWidth(), desiredDimensions.GetHeight() );
558 else if( inputWidth != desiredDimensions.GetWidth() || inputHeight != desiredDimensions.GetHeight() )
560 // Calculate any padding or cropping that needs to be done based on the fitting mode.
561 // Note: If the desired size is larger than the original image, the desired size will be
562 // reduced while maintaining the aspect, in order to save unnecessary memory usage.
563 int scanlinesToCrop = 0;
564 int columnsToCrop = 0;
566 CalculateBordersFromFittingMode( ImageDimensions( inputWidth, inputHeight ), fittingMode, desiredDimensions, scanlinesToCrop, columnsToCrop );
568 unsigned int desiredWidth( desiredDimensions.GetWidth() );
569 unsigned int desiredHeight( desiredDimensions.GetHeight() );
571 // Action the changes by making a new bitmap with the central part of the loaded one if required.
572 if( scanlinesToCrop != 0 || columnsToCrop != 0 )
574 // Split the adding and removing of scanlines and columns into separate variables,
575 // so we can use one piece of generic code to action the changes.
576 unsigned int scanlinesToPad = 0;
577 unsigned int columnsToPad = 0;
578 if( scanlinesToCrop < 0 )
580 scanlinesToPad = -scanlinesToCrop;
583 if( columnsToCrop < 0 )
585 columnsToPad = -columnsToCrop;
589 // If there is no filtering, then the final image size can become very large, exit if larger than maximum.
590 if( ( desiredWidth > MAXIMUM_TARGET_BITMAP_SIZE ) || ( desiredHeight > MAXIMUM_TARGET_BITMAP_SIZE ) ||
591 ( columnsToPad > MAXIMUM_TARGET_BITMAP_SIZE ) || ( scanlinesToPad > MAXIMUM_TARGET_BITMAP_SIZE ) )
593 DALI_LOG_WARNING( "Image scaling aborted as final dimensions too large (%u, %u).\n", desiredWidth, desiredHeight );
597 // Create a new bitmap with the desired size.
598 BitmapPtr croppedBitmap = Integration::Bitmap::New( Integration::Bitmap::BITMAP_2D_PACKED_PIXELS, ResourcePolicy::OWNED_DISCARD );
599 Integration::Bitmap::PackedPixelsProfile *packedView = croppedBitmap->GetPackedPixelsProfile();
600 DALI_ASSERT_DEBUG( packedView );
601 const Pixel::Format pixelFormat = bitmap->GetPixelFormat();
602 packedView->ReserveBuffer( pixelFormat, desiredWidth, desiredHeight, desiredWidth, desiredHeight );
604 // Add some pre-calculated offsets to the bitmap pointers so this is not done within a loop.
605 // The cropping is added to the source pointer, and the padding is added to the destination.
606 const unsigned int bytesPerPixel = Pixel::GetBytesPerPixel( pixelFormat );
607 const PixelBuffer * const sourcePixels = bitmap->GetBuffer() + ( ( ( ( scanlinesToCrop / 2 ) * inputWidth ) + ( columnsToCrop / 2 ) ) * bytesPerPixel );
608 PixelBuffer * const targetPixels = croppedBitmap->GetBuffer();
609 PixelBuffer * const targetPixelsActive = targetPixels + ( ( ( ( scanlinesToPad / 2 ) * desiredWidth ) + ( columnsToPad / 2 ) ) * bytesPerPixel );
610 DALI_ASSERT_DEBUG( sourcePixels && targetPixels );
612 // Copy the image data to the new bitmap.
613 // Optimize to a single memcpy if the left and right edges don't need a crop or a pad.
614 unsigned int outputSpan( desiredWidth * bytesPerPixel );
615 if( columnsToCrop == 0 && columnsToPad == 0 )
617 memcpy( targetPixelsActive, sourcePixels, ( desiredHeight - scanlinesToPad ) * outputSpan );
621 // The width needs to change (due to either a crop or a pad), so we copy a scanline at a time.
622 // Precalculate any constants to optimize the inner loop.
623 const unsigned int inputSpan( inputWidth * bytesPerPixel );
624 const unsigned int copySpan( ( desiredWidth - columnsToPad ) * bytesPerPixel );
625 const unsigned int scanlinesToCopy( desiredHeight - scanlinesToPad );
627 for( unsigned int y = 0; y < scanlinesToCopy; ++y )
629 memcpy( &targetPixelsActive[ y * outputSpan ], &sourcePixels[ y * inputSpan ], copySpan );
633 // Add vertical or horizontal borders to the final image (if required).
634 desiredDimensions.SetWidth( desiredWidth );
635 desiredDimensions.SetHeight( desiredHeight );
636 AddBorders( croppedBitmap->GetBuffer(), bytesPerPixel, desiredDimensions, ImageDimensions( columnsToPad, scanlinesToPad ) );
637 // Overwrite the loaded bitmap with the cropped version
638 bitmap = croppedBitmap;
645 void AddBorders( PixelBuffer *targetPixels, const unsigned int bytesPerPixel, const ImageDimensions targetDimensions, const ImageDimensions padDimensions )
647 // Assign ints for faster access.
648 unsigned int desiredWidth( targetDimensions.GetWidth() );
649 unsigned int desiredHeight( targetDimensions.GetHeight() );
650 unsigned int columnsToPad( padDimensions.GetWidth() );
651 unsigned int scanlinesToPad( padDimensions.GetHeight() );
652 unsigned int outputSpan( desiredWidth * bytesPerPixel );
654 // Add letterboxing (symmetrical borders) if needed.
655 if( scanlinesToPad > 0 )
657 // Add a top border. Note: This is (deliberately) rounded down if padding is an odd number.
658 memset( targetPixels, BORDER_FILL_VALUE, ( scanlinesToPad / 2 ) * outputSpan );
660 // We subtract scanlinesToPad/2 from scanlinesToPad so that we have the correct
661 // offset for odd numbers (as the top border is 1 pixel smaller in these cases.
662 unsigned int bottomBorderHeight = scanlinesToPad - ( scanlinesToPad / 2 );
665 memset( &targetPixels[ ( desiredHeight - bottomBorderHeight ) * outputSpan ], BORDER_FILL_VALUE, bottomBorderHeight * outputSpan );
667 else if( columnsToPad > 0 )
669 // Add a left and right border.
671 // Pre-calculate span size outside of loop.
672 unsigned int leftBorderSpanWidth( ( columnsToPad / 2 ) * bytesPerPixel );
673 for( unsigned int y = 0; y < desiredHeight; ++y )
675 memset( &targetPixels[ y * outputSpan ], BORDER_FILL_VALUE, leftBorderSpanWidth );
679 // Pre-calculate the initial x offset as it is always the same for a small optimization.
680 // We subtract columnsToPad/2 from columnsToPad so that we have the correct
681 // offset for odd numbers (as the left border is 1 pixel smaller in these cases.
682 unsigned int rightBorderWidth = columnsToPad - ( columnsToPad / 2 );
683 PixelBuffer * const destPixelsRightBorder( targetPixels + ( ( desiredWidth - rightBorderWidth ) * bytesPerPixel ) );
684 unsigned int rightBorderSpanWidth = rightBorderWidth * bytesPerPixel;
686 for( unsigned int y = 0; y < desiredHeight; ++y )
688 memset( &destPixelsRightBorder[ y * outputSpan ], BORDER_FILL_VALUE, rightBorderSpanWidth );
693 Integration::BitmapPtr DownscaleBitmap( Integration::Bitmap& bitmap,
694 ImageDimensions desired,
695 FittingMode::Type fittingMode,
696 SamplingMode::Type samplingMode )
698 // Source dimensions as loaded from resources (e.g. filesystem):
699 const unsigned int bitmapWidth = bitmap.GetImageWidth();
700 const unsigned int bitmapHeight = bitmap.GetImageHeight();
701 // Desired dimensions (the rectangle to fit the source image to):
702 const unsigned int desiredWidth = desired.GetWidth();
703 const unsigned int desiredHeight = desired.GetHeight();
705 BitmapPtr outputBitmap( &bitmap );
707 // If a different size than the raw one has been requested, resize the image:
708 if( bitmap.GetPackedPixelsProfile() &&
709 (desiredWidth > 0.0f) && (desiredHeight > 0.0f) &&
710 ((desiredWidth < bitmapWidth) || (desiredHeight < bitmapHeight)) )
712 const Pixel::Format pixelFormat = bitmap.GetPixelFormat();
714 // Do the fast power of 2 iterated box filter to get to roughly the right side if the filter mode requests that:
715 unsigned int shrunkWidth = -1, shrunkHeight = -1;
716 DownscaleInPlacePow2( bitmap.GetBuffer(), pixelFormat, bitmapWidth, bitmapHeight, desiredWidth, desiredHeight, fittingMode, samplingMode, shrunkWidth, shrunkHeight );
718 // Work out the dimensions of the downscaled bitmap, given the scaling mode and desired dimensions:
719 const ImageDimensions filteredDimensions = FitToScalingMode( ImageDimensions( desiredWidth, desiredHeight ), ImageDimensions( shrunkWidth, shrunkHeight ), fittingMode );
720 const unsigned int filteredWidth = filteredDimensions.GetWidth();
721 const unsigned int filteredHeight = filteredDimensions.GetHeight();
723 // Run a filter to scale down the bitmap if it needs it:
724 bool filtered = false;
725 if( filteredWidth < shrunkWidth || filteredHeight < shrunkHeight )
727 if( samplingMode == SamplingMode::LINEAR || samplingMode == SamplingMode::BOX_THEN_LINEAR ||
728 samplingMode == SamplingMode::NEAREST || samplingMode == SamplingMode::BOX_THEN_NEAREST )
730 outputBitmap = MakeEmptyBitmap( pixelFormat, filteredWidth, filteredHeight );
733 if( samplingMode == SamplingMode::LINEAR || samplingMode == SamplingMode::BOX_THEN_LINEAR )
735 LinearSample( bitmap.GetBuffer(), ImageDimensions(shrunkWidth, shrunkHeight), pixelFormat, outputBitmap->GetBuffer(), filteredDimensions );
739 PointSample( bitmap.GetBuffer(), shrunkWidth, shrunkHeight, pixelFormat, outputBitmap->GetBuffer(), filteredWidth, filteredHeight );
745 // Copy out the 2^x downscaled, box-filtered pixels if no secondary filter (point or linear) was applied:
746 if( filtered == false && ( shrunkWidth < bitmapWidth || shrunkHeight < bitmapHeight ) )
748 outputBitmap = MakeBitmap( bitmap.GetBuffer(), pixelFormat, shrunkWidth, shrunkHeight );
758 * @brief Returns whether to keep box filtering based on whether downscaled dimensions will overshoot the desired ones aty the next step.
759 * @param test Which combination of the two dimensions matter for terminating the filtering.
760 * @param scaledWidth The width of the current downscaled image.
761 * @param scaledHeight The height of the current downscaled image.
762 * @param desiredWidth The target width for the downscaling.
763 * @param desiredHeight The target height for the downscaling.
765 bool ContinueScaling( BoxDimensionTest test, unsigned int scaledWidth, unsigned int scaledHeight, unsigned int desiredWidth, unsigned int desiredHeight )
767 bool keepScaling = false;
768 const unsigned int nextWidth = scaledWidth >> 1u;
769 const unsigned int nextHeight = scaledHeight >> 1u;
771 if( nextWidth >= 1u && nextHeight >= 1u )
775 case BoxDimensionTestEither:
777 keepScaling = nextWidth >= desiredWidth || nextHeight >= desiredHeight;
780 case BoxDimensionTestBoth:
782 keepScaling = nextWidth >= desiredWidth && nextHeight >= desiredHeight;
785 case BoxDimensionTestX:
787 keepScaling = nextWidth >= desiredWidth;
790 case BoxDimensionTestY:
792 keepScaling = nextHeight >= desiredHeight;
802 * @brief A shared implementation of the overall iterative box filter
803 * downscaling algorithm.
805 * Specialise this for particular pixel formats by supplying the number of bytes
806 * per pixel and two functions: one for averaging pairs of neighbouring pixels
807 * on a single scanline, and a second for averaging pixels at corresponding
808 * positions on different scanlines.
812 void (*HalveScanlineInPlace)( unsigned char * const pixels, const unsigned int width ),
813 void (*AverageScanlines) ( const unsigned char * const scanline1, const unsigned char * const __restrict__ scanline2, unsigned char* const outputScanline, const unsigned int width )
815 void DownscaleInPlacePow2Generic( unsigned char * const pixels,
816 const unsigned int inputWidth,
817 const unsigned int inputHeight,
818 const unsigned int desiredWidth,
819 const unsigned int desiredHeight,
820 BoxDimensionTest dimensionTest,
822 unsigned& outHeight )
828 ValidateScalingParameters( inputWidth, inputHeight, desiredWidth, desiredHeight );
830 // Scale the image until it would be smaller than desired, stopping if the
831 // resulting height or width would be less than 1:
832 unsigned int scaledWidth = inputWidth, scaledHeight = inputHeight;
833 while( ContinueScaling( dimensionTest, scaledWidth, scaledHeight, desiredWidth, desiredHeight ) )
835 const unsigned int lastWidth = scaledWidth;
839 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Scaling to %u\t%u.\n", scaledWidth, scaledHeight );
841 const unsigned int lastScanlinePair = scaledHeight - 1;
843 // Scale pairs of scanlines until any spare one at the end is dropped:
844 for( unsigned int y = 0; y <= lastScanlinePair; ++y )
846 // Scale two scanlines horizontally:
847 HalveScanlineInPlace( &pixels[y * 2 * lastWidth * BYTES_PER_PIXEL], lastWidth );
848 HalveScanlineInPlace( &pixels[(y * 2 + 1) * lastWidth * BYTES_PER_PIXEL], lastWidth );
850 // Scale vertical pairs of pixels while the last two scanlines are still warm in
852 // Note, better access patterns for cache-coherence are possible for very large
853 // images but even a 4k wide RGB888 image will use just 24kB of cache (4k pixels
854 // * 3 Bpp * 2 scanlines) for two scanlines on the first iteration.
856 &pixels[y * 2 * lastWidth * BYTES_PER_PIXEL],
857 &pixels[(y * 2 + 1) * lastWidth * BYTES_PER_PIXEL],
858 &pixels[y * scaledWidth * BYTES_PER_PIXEL],
863 ///@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.
864 outWidth = scaledWidth;
865 outHeight = scaledHeight;
870 void HalveScanlineInPlaceRGB888( unsigned char * const pixels, const unsigned int width )
872 DebugAssertScanlineParameters( pixels, width );
874 const unsigned int lastPair = EvenDown( width - 2 );
876 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
878 // Load all the byte pixel components we need:
879 const unsigned int c11 = pixels[pixel * 3];
880 const unsigned int c12 = pixels[pixel * 3 + 1];
881 const unsigned int c13 = pixels[pixel * 3 + 2];
882 const unsigned int c21 = pixels[pixel * 3 + 3];
883 const unsigned int c22 = pixels[pixel * 3 + 4];
884 const unsigned int c23 = pixels[pixel * 3 + 5];
886 // Save the averaged byte pixel components:
887 pixels[outPixel * 3] = AverageComponent( c11, c21 );
888 pixels[outPixel * 3 + 1] = AverageComponent( c12, c22 );
889 pixels[outPixel * 3 + 2] = AverageComponent( c13, c23 );
893 void HalveScanlineInPlaceRGBA8888( unsigned char * const pixels, const unsigned int width )
895 DebugAssertScanlineParameters( pixels, width );
896 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(pixels) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
898 uint32_t* const alignedPixels = reinterpret_cast<uint32_t*>(pixels);
900 const unsigned int lastPair = EvenDown( width - 2 );
902 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
904 const uint32_t averaged = AveragePixelRGBA8888( alignedPixels[pixel], alignedPixels[pixel + 1] );
905 alignedPixels[outPixel] = averaged;
909 void HalveScanlineInPlaceRGB565( unsigned char * pixels, unsigned int width )
911 DebugAssertScanlineParameters( pixels, width );
912 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(pixels) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
914 uint16_t* const alignedPixels = reinterpret_cast<uint16_t*>(pixels);
916 const unsigned int lastPair = EvenDown( width - 2 );
918 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
920 const uint32_t averaged = AveragePixelRGB565( alignedPixels[pixel], alignedPixels[pixel + 1] );
921 alignedPixels[outPixel] = averaged;
925 void HalveScanlineInPlace2Bytes( unsigned char * const pixels, const unsigned int width )
927 DebugAssertScanlineParameters( pixels, width );
929 const unsigned int lastPair = EvenDown( width - 2 );
931 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
933 // Load all the byte pixel components we need:
934 const unsigned int c11 = pixels[pixel * 2];
935 const unsigned int c12 = pixels[pixel * 2 + 1];
936 const unsigned int c21 = pixels[pixel * 2 + 2];
937 const unsigned int c22 = pixels[pixel * 2 + 3];
939 // Save the averaged byte pixel components:
940 pixels[outPixel * 2] = AverageComponent( c11, c21 );
941 pixels[outPixel * 2 + 1] = AverageComponent( c12, c22 );
945 void HalveScanlineInPlace1Byte( unsigned char * const pixels, const unsigned int width )
947 DebugAssertScanlineParameters( pixels, width );
949 const unsigned int lastPair = EvenDown( width - 2 );
951 for( unsigned int pixel = 0, outPixel = 0; pixel <= lastPair; pixel += 2, ++outPixel )
953 // Load all the byte pixel components we need:
954 const unsigned int c1 = pixels[pixel];
955 const unsigned int c2 = pixels[pixel + 1];
957 // Save the averaged byte pixel component:
958 pixels[outPixel] = AverageComponent( c1, c2 );
963 * @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.
964 * 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.
966 void AverageScanlines1( const unsigned char * const scanline1,
967 const unsigned char * const __restrict__ scanline2,
968 unsigned char* const outputScanline,
969 const unsigned int width )
971 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width );
973 for( unsigned int component = 0; component < width; ++component )
975 outputScanline[component] = AverageComponent( scanline1[component], scanline2[component] );
979 void AverageScanlines2( const unsigned char * const scanline1,
980 const unsigned char * const __restrict__ scanline2,
981 unsigned char* const outputScanline,
982 const unsigned int width )
984 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 2 );
986 for( unsigned int component = 0; component < width * 2; ++component )
988 outputScanline[component] = AverageComponent( scanline1[component], scanline2[component] );
992 void AverageScanlines3( const unsigned char * const scanline1,
993 const unsigned char * const __restrict__ scanline2,
994 unsigned char* const outputScanline,
995 const unsigned int width )
997 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 3 );
999 for( unsigned int component = 0; component < width * 3; ++component )
1001 outputScanline[component] = AverageComponent( scanline1[component], scanline2[component] );
1005 void AverageScanlinesRGBA8888( const unsigned char * const scanline1,
1006 const unsigned char * const __restrict__ scanline2,
1007 unsigned char * const outputScanline,
1008 const unsigned int width )
1010 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 4 );
1011 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline1) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1012 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline2) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1013 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(outputScanline) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1015 const uint32_t* const alignedScanline1 = reinterpret_cast<const uint32_t*>(scanline1);
1016 const uint32_t* const alignedScanline2 = reinterpret_cast<const uint32_t*>(scanline2);
1017 uint32_t* const alignedOutput = reinterpret_cast<uint32_t*>(outputScanline);
1019 for( unsigned int pixel = 0; pixel < width; ++pixel )
1021 alignedOutput[pixel] = AveragePixelRGBA8888( alignedScanline1[pixel], alignedScanline2[pixel] );
1025 void AverageScanlinesRGB565( const unsigned char * const scanline1,
1026 const unsigned char * const __restrict__ scanline2,
1027 unsigned char * const outputScanline,
1028 const unsigned int width )
1030 DebugAssertDualScanlineParameters( scanline1, scanline2, outputScanline, width * 2 );
1031 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline1) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
1032 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(scanline2) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
1033 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(outputScanline) & 1u) == 0u) && "Pointer should be 2-byte aligned for performance on some platforms." );
1035 const uint16_t* const alignedScanline1 = reinterpret_cast<const uint16_t*>(scanline1);
1036 const uint16_t* const alignedScanline2 = reinterpret_cast<const uint16_t*>(scanline2);
1037 uint16_t* const alignedOutput = reinterpret_cast<uint16_t*>(outputScanline);
1039 for( unsigned int pixel = 0; pixel < width; ++pixel )
1041 alignedOutput[pixel] = AveragePixelRGB565( alignedScanline1[pixel], alignedScanline2[pixel] );
1045 /// Dispatch to pixel format appropriate box filter downscaling functions.
1046 void DownscaleInPlacePow2( unsigned char * const pixels,
1047 Pixel::Format pixelFormat,
1048 unsigned int inputWidth,
1049 unsigned int inputHeight,
1050 unsigned int desiredWidth,
1051 unsigned int desiredHeight,
1052 FittingMode::Type fittingMode,
1053 SamplingMode::Type samplingMode,
1055 unsigned& outHeight )
1057 outWidth = inputWidth;
1058 outHeight = inputHeight;
1059 // Perform power of 2 iterated 4:1 box filtering if the requested filter mode requires it:
1060 if( samplingMode == SamplingMode::BOX || samplingMode == SamplingMode::BOX_THEN_NEAREST || samplingMode == SamplingMode::BOX_THEN_LINEAR )
1062 // Check the pixel format is one that is supported:
1063 if( pixelFormat == Pixel::RGBA8888 || pixelFormat == Pixel::RGB888 || pixelFormat == Pixel::RGB565 || pixelFormat == Pixel::LA88 || pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1065 const BoxDimensionTest dimensionTest = DimensionTestForScalingMode( fittingMode );
1067 if( pixelFormat == Pixel::RGBA8888 )
1069 Internal::Platform::DownscaleInPlacePow2RGBA8888( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1071 else if( pixelFormat == Pixel::RGB888 )
1073 Internal::Platform::DownscaleInPlacePow2RGB888( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1075 else if( pixelFormat == Pixel::RGB565 )
1077 Internal::Platform::DownscaleInPlacePow2RGB565( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1079 else if( pixelFormat == Pixel::LA88 )
1081 Internal::Platform::DownscaleInPlacePow2ComponentPair( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1083 else if( pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1085 Internal::Platform::DownscaleInPlacePow2SingleBytePerPixel( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1089 DALI_ASSERT_DEBUG( false == "Inner branch conditions don't match outer branch." );
1095 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Bitmap was not shrunk: unsupported pixel format: %u.\n", unsigned(pixelFormat) );
1099 void DownscaleInPlacePow2RGB888( unsigned char *pixels,
1100 unsigned int inputWidth,
1101 unsigned int inputHeight,
1102 unsigned int desiredWidth,
1103 unsigned int desiredHeight,
1104 BoxDimensionTest dimensionTest,
1106 unsigned& outHeight )
1108 DownscaleInPlacePow2Generic<3, HalveScanlineInPlaceRGB888, AverageScanlines3>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1111 void DownscaleInPlacePow2RGBA8888( unsigned char * pixels,
1112 unsigned int inputWidth,
1113 unsigned int inputHeight,
1114 unsigned int desiredWidth,
1115 unsigned int desiredHeight,
1116 BoxDimensionTest dimensionTest,
1118 unsigned& outHeight )
1120 DALI_ASSERT_DEBUG( ((reinterpret_cast<ptrdiff_t>(pixels) & 3u) == 0u) && "Pointer should be 4-byte aligned for performance on some platforms." );
1121 DownscaleInPlacePow2Generic<4, HalveScanlineInPlaceRGBA8888, AverageScanlinesRGBA8888>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1124 void DownscaleInPlacePow2RGB565( unsigned char * pixels,
1125 unsigned int inputWidth,
1126 unsigned int inputHeight,
1127 unsigned int desiredWidth,
1128 unsigned int desiredHeight,
1129 BoxDimensionTest dimensionTest,
1130 unsigned int& outWidth,
1131 unsigned int& outHeight )
1133 DownscaleInPlacePow2Generic<2, HalveScanlineInPlaceRGB565, AverageScanlinesRGB565>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1137 * @copydoc DownscaleInPlacePow2RGB888
1139 * For 2-byte formats such as lum8alpha8, but not packed 16 bit formats like RGB565.
1141 void DownscaleInPlacePow2ComponentPair( unsigned char *pixels,
1142 unsigned int inputWidth,
1143 unsigned int inputHeight,
1144 unsigned int desiredWidth,
1145 unsigned int desiredHeight,
1146 BoxDimensionTest dimensionTest,
1148 unsigned& outHeight )
1150 DownscaleInPlacePow2Generic<2, HalveScanlineInPlace2Bytes, AverageScanlines2>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1153 void DownscaleInPlacePow2SingleBytePerPixel( unsigned char * pixels,
1154 unsigned int inputWidth,
1155 unsigned int inputHeight,
1156 unsigned int desiredWidth,
1157 unsigned int desiredHeight,
1158 BoxDimensionTest dimensionTest,
1159 unsigned int& outWidth,
1160 unsigned int& outHeight )
1162 DownscaleInPlacePow2Generic<1, HalveScanlineInPlace1Byte, AverageScanlines1>( pixels, inputWidth, inputHeight, desiredWidth, desiredHeight, dimensionTest, outWidth, outHeight );
1169 * @brief Point sample an image to a new resolution (like GL_NEAREST).
1171 * Template is used purely as a type-safe code generator in this one
1172 * compilation unit. Generated code is inlined into type-specific wrapper
1173 * functions below which are exported to rest of module.
1175 template<typename PIXEL>
1176 inline void PointSampleAddressablePixels( const uint8_t * inPixels,
1177 unsigned int inputWidth,
1178 unsigned int inputHeight,
1179 uint8_t * outPixels,
1180 unsigned int desiredWidth,
1181 unsigned int desiredHeight )
1183 DALI_ASSERT_DEBUG( ((desiredWidth <= inputWidth && desiredHeight <= inputHeight) ||
1184 outPixels >= inPixels + inputWidth * inputHeight * sizeof(PIXEL) || outPixels <= inPixels - desiredWidth * desiredHeight * sizeof(PIXEL)) &&
1185 "The input and output buffers must not overlap for an upscaling.");
1186 DALI_ASSERT_DEBUG( reinterpret_cast< 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, ...)." );
1187 DALI_ASSERT_DEBUG( reinterpret_cast< 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, ...)." );
1189 if( inputWidth < 1u || inputHeight < 1u || desiredWidth < 1u || desiredHeight < 1u )
1193 const PIXEL* const inAligned = reinterpret_cast<const PIXEL*>(inPixels);
1194 PIXEL* const outAligned = reinterpret_cast<PIXEL*>(outPixels);
1195 const unsigned int deltaX = (inputWidth << 16u) / desiredWidth;
1196 const unsigned int deltaY = (inputHeight << 16u) / desiredHeight;
1198 unsigned int inY = 0;
1199 for( unsigned int outY = 0; outY < desiredHeight; ++outY )
1201 // Round fixed point y coordinate to nearest integer:
1202 const unsigned int integerY = (inY + (1u << 15u)) >> 16u;
1203 const PIXEL* const inScanline = &inAligned[inputWidth * integerY];
1204 PIXEL* const outScanline = &outAligned[desiredWidth * outY];
1206 DALI_ASSERT_DEBUG( integerY < inputHeight );
1207 DALI_ASSERT_DEBUG( reinterpret_cast<const uint8_t*>(inScanline) < ( inPixels + inputWidth * inputHeight * sizeof(PIXEL) ) );
1208 DALI_ASSERT_DEBUG( reinterpret_cast<uint8_t*>(outScanline) < ( outPixels + desiredWidth * desiredHeight * sizeof(PIXEL) ) );
1210 unsigned int inX = 0;
1211 for( unsigned int outX = 0; outX < desiredWidth; ++outX )
1213 // Round the fixed-point x coordinate to an integer:
1214 const unsigned int integerX = (inX + (1u << 15u)) >> 16u;
1215 const PIXEL* const inPixelAddress = &inScanline[integerX];
1216 const PIXEL pixel = *inPixelAddress;
1217 outScanline[outX] = pixel;
1227 void PointSample4BPP( const unsigned char * inPixels,
1228 unsigned int inputWidth,
1229 unsigned int inputHeight,
1230 unsigned char * outPixels,
1231 unsigned int desiredWidth,
1232 unsigned int desiredHeight )
1234 PointSampleAddressablePixels<uint32_t>( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1238 void PointSample2BPP( const unsigned char * inPixels,
1239 unsigned int inputWidth,
1240 unsigned int inputHeight,
1241 unsigned char * outPixels,
1242 unsigned int desiredWidth,
1243 unsigned int desiredHeight )
1245 PointSampleAddressablePixels<uint16_t>( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1249 void PointSample1BPP( const unsigned char * inPixels,
1250 unsigned int inputWidth,
1251 unsigned int inputHeight,
1252 unsigned char * outPixels,
1253 unsigned int desiredWidth,
1254 unsigned int desiredHeight )
1256 PointSampleAddressablePixels<uint8_t>( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1260 * RGB888 is a special case as its pixels are not aligned addressable units.
1262 void PointSample3BPP( const uint8_t * inPixels,
1263 unsigned int inputWidth,
1264 unsigned int inputHeight,
1265 uint8_t * outPixels,
1266 unsigned int desiredWidth,
1267 unsigned int desiredHeight )
1269 if( inputWidth < 1u || inputHeight < 1u || desiredWidth < 1u || desiredHeight < 1u )
1273 const unsigned int BYTES_PER_PIXEL = 3;
1275 // Generate fixed-point 16.16 deltas in input image coordinates:
1276 const unsigned int deltaX = (inputWidth << 16u) / desiredWidth;
1277 const unsigned int deltaY = (inputHeight << 16u) / desiredHeight;
1279 // Step through output image in whole integer pixel steps while tracking the
1280 // corresponding locations in the input image using 16.16 fixed-point
1282 unsigned int inY = 0; //< 16.16 fixed-point input image y-coord.
1283 for( unsigned int outY = 0; outY < desiredHeight; ++outY )
1285 const unsigned int integerY = (inY + (1u << 15u)) >> 16u;
1286 const uint8_t* const inScanline = &inPixels[inputWidth * integerY * BYTES_PER_PIXEL];
1287 uint8_t* const outScanline = &outPixels[desiredWidth * outY * BYTES_PER_PIXEL];
1288 unsigned int inX = 0; //< 16.16 fixed-point input image x-coord.
1290 for( unsigned int outX = 0; outX < desiredWidth * BYTES_PER_PIXEL; outX += BYTES_PER_PIXEL )
1292 // Round the fixed-point input coordinate to the address of the input pixel to sample:
1293 const unsigned int integerX = (inX + (1u << 15u)) >> 16u;
1294 const uint8_t* const inPixelAddress = &inScanline[integerX * BYTES_PER_PIXEL];
1296 // Issue loads for all pixel color components up-front:
1297 const unsigned int c0 = inPixelAddress[0];
1298 const unsigned int c1 = inPixelAddress[1];
1299 const unsigned int c2 = inPixelAddress[2];
1300 ///@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.
1302 // Output the pixel components:
1303 outScanline[outX] = c0;
1304 outScanline[outX + 1] = c1;
1305 outScanline[outX + 2] = c2;
1307 // Increment the fixed-point input coordinate:
1315 // Dispatch to a format-appropriate point sampling function:
1316 void PointSample( const unsigned char * inPixels,
1317 unsigned int inputWidth,
1318 unsigned int inputHeight,
1319 Pixel::Format pixelFormat,
1320 unsigned char * outPixels,
1321 unsigned int desiredWidth,
1322 unsigned int desiredHeight )
1324 // Check the pixel format is one that is supported:
1325 if( pixelFormat == Pixel::RGBA8888 || pixelFormat == Pixel::RGB888 || pixelFormat == Pixel::RGB565 || pixelFormat == Pixel::LA88 || pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1327 if( pixelFormat == Pixel::RGB888 )
1329 PointSample3BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1331 else if( pixelFormat == Pixel::RGBA8888 )
1333 PointSample4BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1335 else if( pixelFormat == Pixel::RGB565 || pixelFormat == Pixel::LA88 )
1337 PointSample2BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1339 else if( pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1341 PointSample1BPP( inPixels, inputWidth, inputHeight, outPixels, desiredWidth, desiredHeight );
1345 DALI_ASSERT_DEBUG( false == "Inner branch conditions don't match outer branch." );
1350 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Bitmap was not point sampled: unsupported pixel format: %u.\n", unsigned(pixelFormat) );
1354 // Linear sampling group below
1359 /** @brief Blend 4 pixels together using horizontal and vertical weights. */
1360 inline uint8_t BilinearFilter1BPPByte( uint8_t tl, uint8_t tr, uint8_t bl, uint8_t br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1362 return BilinearFilter1Component( tl, tr, bl, br, fractBlendHorizontal, fractBlendVertical );
1365 /** @copydoc BilinearFilter1BPPByte */
1366 inline Pixel2Bytes BilinearFilter2Bytes( Pixel2Bytes tl, Pixel2Bytes tr, Pixel2Bytes bl, Pixel2Bytes br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1369 pixel.l = BilinearFilter1Component( tl.l, tr.l, bl.l, br.l, fractBlendHorizontal, fractBlendVertical );
1370 pixel.a = BilinearFilter1Component( tl.a, tr.a, bl.a, br.a, fractBlendHorizontal, fractBlendVertical );
1374 /** @copydoc BilinearFilter1BPPByte */
1375 inline Pixel3Bytes BilinearFilterRGB888( Pixel3Bytes tl, Pixel3Bytes tr, Pixel3Bytes bl, Pixel3Bytes br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1378 pixel.r = BilinearFilter1Component( tl.r, tr.r, bl.r, br.r, fractBlendHorizontal, fractBlendVertical );
1379 pixel.g = BilinearFilter1Component( tl.g, tr.g, bl.g, br.g, fractBlendHorizontal, fractBlendVertical );
1380 pixel.b = BilinearFilter1Component( tl.b, tr.b, bl.b, br.b, fractBlendHorizontal, fractBlendVertical );
1384 /** @copydoc BilinearFilter1BPPByte */
1385 inline PixelRGB565 BilinearFilterRGB565( PixelRGB565 tl, PixelRGB565 tr, PixelRGB565 bl, PixelRGB565 br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1387 const PixelRGB565 pixel = (BilinearFilter1Component( tl >> 11u, tr >> 11u, bl >> 11u, br >> 11u, fractBlendHorizontal, fractBlendVertical ) << 11u) +
1388 (BilinearFilter1Component( (tl >> 5u) & 63u, (tr >> 5u) & 63u, (bl >> 5u) & 63u, (br >> 5u) & 63u, fractBlendHorizontal, fractBlendVertical ) << 5u) +
1389 BilinearFilter1Component( tl & 31u, tr & 31u, bl & 31u, br & 31u, fractBlendHorizontal, fractBlendVertical );
1393 /** @copydoc BilinearFilter1BPPByte */
1394 inline Pixel4Bytes BilinearFilter4Bytes( Pixel4Bytes tl, Pixel4Bytes tr, Pixel4Bytes bl, Pixel4Bytes br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical )
1397 pixel.r = BilinearFilter1Component( tl.r, tr.r, bl.r, br.r, fractBlendHorizontal, fractBlendVertical );
1398 pixel.g = BilinearFilter1Component( tl.g, tr.g, bl.g, br.g, fractBlendHorizontal, fractBlendVertical );
1399 pixel.b = BilinearFilter1Component( tl.b, tr.b, bl.b, br.b, fractBlendHorizontal, fractBlendVertical );
1400 pixel.a = BilinearFilter1Component( tl.a, tr.a, bl.a, br.a, fractBlendHorizontal, fractBlendVertical );
1405 * @brief Generic version of bilinear sampling image resize function.
1406 * @note Limited to one compilation unit and exposed through type-specific
1407 * wrapper functions below.
1411 PIXEL (*BilinearFilter) ( PIXEL tl, PIXEL tr, PIXEL bl, PIXEL br, unsigned int fractBlendHorizontal, unsigned int fractBlendVertical ),
1412 bool DEBUG_ASSERT_ALIGNMENT
1414 inline void LinearSampleGeneric( const unsigned char * __restrict__ inPixels,
1415 ImageDimensions inputDimensions,
1416 unsigned char * __restrict__ outPixels,
1417 ImageDimensions desiredDimensions )
1419 const unsigned int inputWidth = inputDimensions.GetWidth();
1420 const unsigned int inputHeight = inputDimensions.GetHeight();
1421 const unsigned int desiredWidth = desiredDimensions.GetWidth();
1422 const unsigned int desiredHeight = desiredDimensions.GetHeight();
1424 DALI_ASSERT_DEBUG( ((outPixels >= inPixels + inputWidth * inputHeight * sizeof(PIXEL)) ||
1425 (inPixels >= outPixels + desiredWidth * desiredHeight * sizeof(PIXEL))) &&
1426 "Input and output buffers cannot overlap.");
1427 if( DEBUG_ASSERT_ALIGNMENT )
1429 DALI_ASSERT_DEBUG( reinterpret_cast< 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, ...)." );
1430 DALI_ASSERT_DEBUG( reinterpret_cast< 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, ...)." );
1433 if( inputWidth < 1u || inputHeight < 1u || desiredWidth < 1u || desiredHeight < 1u )
1437 const PIXEL* const inAligned = reinterpret_cast<const PIXEL*>(inPixels);
1438 PIXEL* const outAligned = reinterpret_cast<PIXEL*>(outPixels);
1439 const unsigned int deltaX = (inputWidth << 16u) / desiredWidth;
1440 const unsigned int deltaY = (inputHeight << 16u) / desiredHeight;
1442 unsigned int inY = 0;
1443 for( unsigned int outY = 0; outY < desiredHeight; ++outY )
1445 PIXEL* const outScanline = &outAligned[desiredWidth * outY];
1447 // Find the two scanlines to blend and the weight to blend with:
1448 const unsigned int integerY1 = inY >> 16u;
1449 const unsigned int integerY2 = integerY1 >= inputHeight ? integerY1 : integerY1 + 1;
1450 const unsigned int inputYWeight = inY & 65535u;
1452 DALI_ASSERT_DEBUG( integerY1 < inputHeight );
1453 DALI_ASSERT_DEBUG( integerY2 < inputHeight );
1455 const PIXEL* const inScanline1 = &inAligned[inputWidth * integerY1];
1456 const PIXEL* const inScanline2 = &inAligned[inputWidth * integerY2];
1458 unsigned int inX = 0;
1459 for( unsigned int outX = 0; outX < desiredWidth; ++outX )
1461 // Work out the two pixel scanline offsets for this cluster of four samples:
1462 const unsigned int integerX1 = inX >> 16u;
1463 const unsigned int integerX2 = integerX1 >= inputWidth ? integerX1 : integerX1 + 1;
1465 // Execute the loads:
1466 const PIXEL pixel1 = inScanline1[integerX1];
1467 const PIXEL pixel2 = inScanline2[integerX1];
1468 const PIXEL pixel3 = inScanline1[integerX2];
1469 const PIXEL pixel4 = inScanline2[integerX2];
1470 ///@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.
1472 // Weighted bilinear filter:
1473 const unsigned int inputXWeight = inX & 65535u;
1474 outScanline[outX] = BilinearFilter( pixel1, pixel3, pixel2, pixel4, inputXWeight, inputYWeight );
1484 // Format-specific linear scaling instantiations:
1486 void LinearSample1BPP( const unsigned char * __restrict__ inPixels,
1487 ImageDimensions inputDimensions,
1488 unsigned char * __restrict__ outPixels,
1489 ImageDimensions desiredDimensions )
1491 LinearSampleGeneric<uint8_t, BilinearFilter1BPPByte, false>( inPixels, inputDimensions, outPixels, desiredDimensions );
1494 void LinearSample2BPP( const unsigned char * __restrict__ inPixels,
1495 ImageDimensions inputDimensions,
1496 unsigned char * __restrict__ outPixels,
1497 ImageDimensions desiredDimensions )
1499 LinearSampleGeneric<Pixel2Bytes, BilinearFilter2Bytes, true>( inPixels, inputDimensions, outPixels, desiredDimensions );
1502 void LinearSampleRGB565( const unsigned char * __restrict__ inPixels,
1503 ImageDimensions inputDimensions,
1504 unsigned char * __restrict__ outPixels,
1505 ImageDimensions desiredDimensions )
1507 LinearSampleGeneric<PixelRGB565, BilinearFilterRGB565, true>( inPixels, inputDimensions, outPixels, desiredDimensions );
1510 void LinearSample3BPP( const unsigned char * __restrict__ inPixels,
1511 ImageDimensions inputDimensions,
1512 unsigned char * __restrict__ outPixels,
1513 ImageDimensions desiredDimensions )
1515 LinearSampleGeneric<Pixel3Bytes, BilinearFilterRGB888, false>( inPixels, inputDimensions, outPixels, desiredDimensions );
1518 void LinearSample4BPP( const unsigned char * __restrict__ inPixels,
1519 ImageDimensions inputDimensions,
1520 unsigned char * __restrict__ outPixels,
1521 ImageDimensions desiredDimensions )
1523 LinearSampleGeneric<Pixel4Bytes, BilinearFilter4Bytes, true>( inPixels, inputDimensions, outPixels, desiredDimensions );
1526 void LanczosSample4BPP( const unsigned char * __restrict__ inPixels,
1527 ImageDimensions inputDimensions,
1528 unsigned char * __restrict__ outPixels,
1529 ImageDimensions desiredDimensions )
1531 // Got from the test.cpp of the ImageResampler lib.
1532 const float ONE_DIV_255 = 1.0f / 255.0f;
1533 const int MAX_UNSIGNED_CHAR = std::numeric_limits<uint8_t>::max();
1534 const int LINEAR_TO_SRGB_TABLE_SIZE = 4096;
1535 const int ALPHA_CHANNEL = 3;
1536 const int NUMBER_OF_CHANNELS = 4;
1538 float srgbToLinear[MAX_UNSIGNED_CHAR + 1];
1539 for( int i = 0; i <= MAX_UNSIGNED_CHAR; ++i )
1541 srgbToLinear[i] = pow( static_cast<float>( i ) * ONE_DIV_255, DEFAULT_SOURCE_GAMMA );
1544 unsigned char linearToSrgb[LINEAR_TO_SRGB_TABLE_SIZE];
1546 const float invLinearToSrgbTableSize = 1.0f / static_cast<float>( LINEAR_TO_SRGB_TABLE_SIZE );
1547 const float invSourceGamma = 1.0f / DEFAULT_SOURCE_GAMMA;
1549 for( int i = 0; i < LINEAR_TO_SRGB_TABLE_SIZE; ++i )
1551 int k = static_cast<int>( 255.0f * pow( static_cast<float>( i ) * invLinearToSrgbTableSize, invSourceGamma ) + 0.5f );
1556 else if( k > MAX_UNSIGNED_CHAR )
1558 k = MAX_UNSIGNED_CHAR;
1560 linearToSrgb[i] = static_cast<unsigned char>( k );
1563 Resampler* resamplers[NUMBER_OF_CHANNELS] = { 0 };
1564 Vector<float> samples[NUMBER_OF_CHANNELS];
1566 const int srcWidth = inputDimensions.GetWidth();
1567 const int srcHeight = inputDimensions.GetHeight();
1568 const int dstWidth = desiredDimensions.GetWidth();
1569 const int dstHeight = desiredDimensions.GetHeight();
1571 // Now create a Resampler instance for each component to process. The first instance will create new contributor tables, which are shared by the resamplers
1572 // used for the other components (a memory and slight cache efficiency optimization).
1573 resamplers[0] = new Resampler( srcWidth,
1577 Resampler::BOUNDARY_CLAMP,
1578 0.0f, // sample_low,
1579 1.0f, // sample_high. Clamp output samples to specified range, or disable clamping if sample_low >= sample_high.
1580 FILTER_TYPE, // The type of filter. Currently Lanczos.
1582 NULL, // Pclist_y. Optional pointers to contributor lists from another instance of a Resampler.
1583 FILTER_SCALE, // src_x_ofs,
1584 FILTER_SCALE ); // src_y_ofs. Offset input image by specified amount (fractional values okay).
1585 samples[0].Resize( srcWidth );
1586 for( int i = 1; i < NUMBER_OF_CHANNELS; ++i )
1588 resamplers[i] = new Resampler( srcWidth,
1592 Resampler::BOUNDARY_CLAMP,
1596 resamplers[0]->get_clist_x(),
1597 resamplers[0]->get_clist_y(),
1600 samples[i].Resize( srcWidth );
1603 const int srcPitch = srcWidth * NUMBER_OF_CHANNELS;
1604 const int dstPitch = dstWidth * NUMBER_OF_CHANNELS;
1607 for( int srcY = 0; srcY < srcHeight; ++srcY )
1609 const unsigned char* pSrc = &inPixels[srcY * srcPitch];
1611 for( int x = 0; x < srcWidth; ++x )
1613 for( int c = 0; c < NUMBER_OF_CHANNELS; ++c )
1615 if( c == ALPHA_CHANNEL )
1617 samples[c][x] = *pSrc++ * ONE_DIV_255;
1621 samples[c][x] = srgbToLinear[*pSrc++];
1626 for( int c = 0; c < NUMBER_OF_CHANNELS; ++c )
1628 if( !resamplers[c]->put_line( &samples[c][0] ) )
1630 DALI_ASSERT_DEBUG( !"Out of memory" );
1637 for( compIndex = 0; compIndex < NUMBER_OF_CHANNELS; ++compIndex )
1639 const float* pOutputSamples = resamplers[compIndex]->get_line();
1640 if( !pOutputSamples )
1645 const bool isAlphaChannel = ( compIndex == ALPHA_CHANNEL );
1646 DALI_ASSERT_DEBUG( dstY < dstHeight );
1647 unsigned char* pDst = &outPixels[dstY * dstPitch + compIndex];
1649 for( int x = 0; x < dstWidth; ++x )
1651 if( isAlphaChannel )
1653 int c = static_cast<int>( 255.0f * pOutputSamples[x] + 0.5f );
1658 else if( c > MAX_UNSIGNED_CHAR )
1660 c = MAX_UNSIGNED_CHAR;
1662 *pDst = static_cast<unsigned char>( c );
1666 int j = static_cast<int>( LINEAR_TO_SRGB_TABLE_SIZE * pOutputSamples[x] + 0.5f );
1671 else if( j >= LINEAR_TO_SRGB_TABLE_SIZE )
1673 j = LINEAR_TO_SRGB_TABLE_SIZE - 1;
1675 *pDst = linearToSrgb[j];
1678 pDst += NUMBER_OF_CHANNELS;
1681 if( compIndex < NUMBER_OF_CHANNELS )
1690 // Delete the resamplers.
1691 for( int i = 0; i < NUMBER_OF_CHANNELS; ++i )
1693 delete resamplers[i];
1697 // Dispatch to a format-appropriate linear sampling function:
1698 void LinearSample( const unsigned char * __restrict__ inPixels,
1699 ImageDimensions inDimensions,
1700 Pixel::Format pixelFormat,
1701 unsigned char * __restrict__ outPixels,
1702 ImageDimensions outDimensions )
1704 // Check the pixel format is one that is supported:
1705 if( pixelFormat == Pixel::RGB888 || pixelFormat == Pixel::RGBA8888 || pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 || pixelFormat == Pixel::LA88 || pixelFormat == Pixel::RGB565 )
1707 if( pixelFormat == Pixel::RGB888 )
1709 LinearSample3BPP( inPixels, inDimensions, outPixels, outDimensions );
1711 else if( pixelFormat == Pixel::RGBA8888 )
1713 LinearSample4BPP( inPixels, inDimensions, outPixels, outDimensions );
1715 else if( pixelFormat == Pixel::L8 || pixelFormat == Pixel::A8 )
1717 LinearSample1BPP( inPixels, inDimensions, outPixels, outDimensions );
1719 else if( pixelFormat == Pixel::LA88 )
1721 LinearSample2BPP( inPixels, inDimensions, outPixels, outDimensions );
1723 else if ( pixelFormat == Pixel::RGB565 )
1725 LinearSampleRGB565( inPixels, inDimensions, outPixels, outDimensions );
1729 DALI_ASSERT_DEBUG( false == "Inner branch conditions don't match outer branch." );
1734 DALI_LOG_INFO( gImageOpsLogFilter, Dali::Integration::Log::Verbose, "Bitmap was not linear sampled: unsupported pixel format: %u.\n", unsigned(pixelFormat) );
1738 } /* namespace Platform */
1739 } /* namespace Internal */
1740 } /* namespace Dali */