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e8ab6a825a
This function returns a rough estimation of the quality factor used for compressing the WebP bitstream. Simple command line: 'webp_quality [-quiet] in.webp' should print the estimated quality factor. Change-Id: Ifba3e489461f5a587003ac9f08cc7556e9b24ac2
60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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#ifndef WEBP_EXTRAS_EXTRAS_H_
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#define WEBP_EXTRAS_EXTRAS_H_
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#include "webp/types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "webp/encode.h"
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#define WEBP_EXTRAS_ABI_VERSION 0x0000 // MAJOR(8b) + MINOR(8b)
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//------------------------------------------------------------------------------
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// Returns the version number of the extras library, packed in hexadecimal using
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// 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
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WEBP_EXTERN(int) WebPGetExtrasVersion(void);
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//------------------------------------------------------------------------------
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// Ad-hoc colorspace importers.
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// Import luma sample (gray scale image) into 'picture'. The 'picture'
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// width and height must be set prior to calling this function.
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WEBP_EXTERN(int) WebPImportGray(const uint8_t* gray, WebPPicture* picture);
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// Import rgb sample in RGB565 packed format into 'picture'. The 'picture'
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// width and height must be set prior to calling this function.
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WEBP_EXTERN(int) WebPImportRGB565(const uint8_t* rgb565, WebPPicture* pic);
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// Import rgb sample in RGB4444 packed format into 'picture'. The 'picture'
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// width and height must be set prior to calling this function.
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WEBP_EXTERN(int) WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic);
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//------------------------------------------------------------------------------
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// Parse a bitstream, search for VP8 (lossy) header and report a
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// rough estimation of the quality factor used for compressing the bitstream.
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// Any error (invalid bitstream, lossless compression, incomplete header, etc.)
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// will return a value of -1.
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WEBP_EXTERN(int) VP8EstimateQuality(const uint8_t* const data, size_t size);
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//------------------------------------------------------------------------------
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* WEBP_EXTRAS_EXTRAS_H_ */
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