514d008921
Pulled from the current HEAD (218c32e). The history of this and related files is a bit entangled so rather trying to split the changes and introduce some noise in master's history we'll start with a fresh snapshot. The file progression is still available in the experimental branch. Change-Id: I40538799dbf999abb9408ac83f55b897d8e22498
60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// Image transforms and color space conversion methods for lossless decoder.
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//
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// Author: Vikas Arora (vikaas.arora@gmail.com)
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// jyrki@google.com (Jyrki Alakuijala)
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#ifndef WEBP_DSP_LOSSLESS_H_
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#define WEBP_DSP_LOSSLESS_H_
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#include "../webp/types.h"
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#include "../webp/decode.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// Inverse image transforms.
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struct VP8LTransform; // Defined in dec/vp8li.h.
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// Performs inverse transform of data given transform information, start and end
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// rows. Transform will be applied to rows [row_start, row_end[.
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// The data_in & data_out are source and destination data pointers respectively
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// corresponding to the intermediate row (row_start).
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void VP8LInverseTransform(const struct VP8LTransform* const transform,
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size_t row_start, size_t row_end,
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uint32_t* const data_in, uint32_t* const data_out);
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//------------------------------------------------------------------------------
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// Color space conversion.
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// Converts from BGRA to other color spaces.
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void VP8LConvertFromBGRA(const uint32_t* const in_data, int num_pixels,
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WEBP_CSP_MODE out_colorspace,
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uint8_t* const rgba);
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//------------------------------------------------------------------------------
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// Misc methods.
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// Computes sampled size of 'size' when sampling using 'sampling bits'.
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static WEBP_INLINE uint32_t VP8LSubSampleSize(uint32_t size,
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uint32_t sampling_bits) {
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return (size + (1 << sampling_bits) - 1) >> sampling_bits;
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}
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//------------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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#endif // WEBP_DSP_LOSSLESS_H_
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