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55 lines
2.7 KiB
55 lines
2.7 KiB
1 year ago
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#ifndef Magnum_GL_Implementation_imageProperties_h
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#define Magnum_GL_Implementation_imageProperties_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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2020, 2021, 2022, 2023, 2024, 2025
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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 "Magnum/Implementation/ImageProperties.h"
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namespace Magnum { namespace GL { namespace Implementation {
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/* Used in compressed image upload functions. Unlike what common sense and
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various robustness extensions would imply, where the size is the memory
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range occupied by the data given various pixel storage parameters, it's
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instead expected to stupidly be just the image dimensions (*not* row length
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etc) in whole blocks. Which has absolutely NO RELATION to the actual memory
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and thus is completely useless for enforcing any memory security in the
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driver, it's only there to bully users. My suspicion is that whoever did
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ARB_compressed_texture_pixel_storage (which makes skip, row length etc.
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possible for compressed formats) didn't bother thinking about what the
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existing parameter is for, just left it unchanged, and nobody else in the
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commitee bothered either.
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In case the block size properties aren't set, the actual image data size is
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used as a backup, which might still be correct in most cases. */
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template<class T> std::size_t occupiedCompressedImageDataSize(const T& image, std::size_t dataSize) {
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return image.storage().compressedBlockSize().product() && image.storage().compressedBlockDataSize()
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? Magnum::Implementation::compressedImageDataOffsetSizeFor(image, image.size()).second : dataSize;
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}
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}}}
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#endif
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