mirror of https://github.com/mosra/magnum.git
Vladimír Vondruš
7 years ago
13 changed files with 478 additions and 8 deletions
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#ifndef Magnum_Implementation_ImagePixelView_h |
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#define Magnum_Implementation_ImagePixelView_h |
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/*
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 |
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Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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#include <utility> |
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#include <Corrade/Containers/StridedArrayView.h> |
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#include "Magnum/Magnum.h" |
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#include "Magnum/DimensionTraits.h" |
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namespace Magnum { namespace Implementation { |
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template<UnsignedInt dimensions, class T, class Image> Containers::StridedArrayView<dimensions + 1, T> imagePixelView(Image& image) { |
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const std::pair<VectorTypeFor<dimensions, std::size_t>, VectorTypeFor<dimensions, std::size_t>> properties = image.dataProperties(); |
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/* Size in the last dimension is byte size of the pixel, the remaining
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dimensions are reverted (first images, then rows, then pixels, last |
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pixel bytes) */ |
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Containers::StridedDimensions<dimensions + 1, std::size_t> size{Containers::NoInit}; |
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size[dimensions] = image.pixelSize(); |
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for(UnsignedInt i = dimensions; i != 0; --i) |
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size[i - 1] = image.size()[dimensions - i]; |
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/* Stride in the last dimension is 1, stride in the second-to-last
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dimension ix pixel byte size. The remaining imensions are reverted |
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(first image size, then row size, then pixel size, last 1). The |
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data properties include pixel size in row size, so we have to take it |
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out from the cumulative product. */ |
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Containers::StridedDimensions<dimensions + 1, std::ptrdiff_t> stride{Containers::NoInit}; |
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stride[dimensions] = 1; |
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stride[dimensions - 1] = 1; |
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for(UnsignedInt i = dimensions - 1; i != 0; --i) |
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stride[i - 1] = stride[i]*properties.second[dimensions - i - 1]; |
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stride[dimensions - 1] = image.pixelSize(); |
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static_assert(sizeof(decltype(image.data().front())) == 1, |
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"pointer arithmetic expects image data type to have 1 byte"); |
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return {image.data().suffix(properties.first[dimensions - 1]), image.data() + properties.first.sum(), size, stride}; |
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} |
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}} |
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#endif |
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