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This is to infer the needed conversion to YUV(A) or RGB(A). This is useful to avoid some conversion steps between ARGB and YUVA. For instance, if the input file is a JPEG, we decode to RGB and convert to YUV right away, without the intermediate step to ARGB. The only caveat is that cropping/scaling might give slightly different result, because of YUV420 downsampling. Therefore, we omit this feature at cwebp level, when -crop or -rescale is used. Change-Id: I5a3abe5108982f2a4570e841e3d9baffc73f5bee
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
// Copyright 2012 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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// TIFF decode.
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#ifndef WEBP_EXAMPLES_TIFFDEC_H_
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#define WEBP_EXAMPLES_TIFFDEC_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct Metadata;
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struct WebPPicture;
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// Reads a TIFF from 'filename', returning the decoded output in 'pic'.
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// Output is RGBA or YUVA, depending on pic->use_argb value.
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// If 'keep_alpha' is true and the TIFF has an alpha channel, the output is RGBA
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// or YUVA. Otherwise, alpha channel is dropped and output is RGB or YUV.
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// Returns true on success.
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int ReadTIFF(const char* const filename,
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struct WebPPicture* const pic, int keep_alpha,
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struct Metadata* const metadata);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // WEBP_EXAMPLES_TIFFDEC_H_
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