go-libwebp

Experimental translation from libwebp to Go source.
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image_dec.h (2310B)

      1 // Copyright 2016 Google Inc. All Rights Reserved.
      2 //
      3 // Use of this source code is governed by a BSD-style license
      4 // that can be found in the COPYING file in the root of the source
      5 // tree. An additional intellectual property rights grant can be found
      6 // in the file PATENTS. All contributing project authors may
      7 // be found in the AUTHORS file in the root of the source tree.
      8 // -----------------------------------------------------------------------------
      9 //
     10 //  All-in-one library to decode PNG/JPEG/WebP/TIFF/WIC input images.
     11 //
     12 // Author: Skal (pascal.massimino@gmail.com)
     13 
     14 #ifndef WEBP_IMAGEIO_IMAGE_DEC_H_
     15 #define WEBP_IMAGEIO_IMAGE_DEC_H_
     16 
     17 #include <stddef.h>
     18 
     19 #include "webp/types.h"
     20 
     21 #ifdef HAVE_CONFIG_H
     22 #include "webp/config.h"
     23 #endif
     24 
     25 #include "./metadata.h"
     26 #include "./jpegdec.h"
     27 #include "./pngdec.h"
     28 #include "./pnmdec.h"
     29 #include "./tiffdec.h"
     30 #include "./webpdec.h"
     31 #include "./wicdec.h"
     32 
     33 #ifdef __cplusplus
     34 extern "C" {
     35 #endif
     36 
     37 typedef enum {
     38   WEBP_PNG_FORMAT = 0,
     39   WEBP_JPEG_FORMAT,
     40   WEBP_TIFF_FORMAT,
     41   WEBP_WEBP_FORMAT,
     42   WEBP_PNM_FORMAT,
     43   WEBP_UNSUPPORTED_FORMAT
     44 } WebPInputFileFormat;
     45 
     46 // Returns a comma separated list of enabled input formats.
     47 const char* WebPGetEnabledInputFileFormats(void);
     48 
     49 // Try to infer the image format. 'data_size' should be larger than 12.
     50 // Returns WEBP_UNSUPPORTED_FORMAT if format can't be guess safely.
     51 WebPInputFileFormat WebPGuessImageType(const uint8_t* const data,
     52                                        size_t data_size);
     53 
     54 // Signature for common image-reading functions (ReadPNG, ReadJPEG, ...)
     55 typedef int (*WebPImageReader)(const uint8_t* const data, size_t data_size,
     56                                struct WebPPicture* const pic,
     57                                int keep_alpha, struct Metadata* const metadata);
     58 
     59 // Return the reader associated to a given file format.
     60 WebPImageReader WebPGetImageReader(WebPInputFileFormat format);
     61 
     62 // This function is similar to WebPGuessImageType(), but returns a
     63 // suitable reader function. The returned reader is never NULL, but
     64 // unknown formats will return an always-failing valid reader.
     65 WebPImageReader WebPGuessImageReader(const uint8_t* const data,
     66                                      size_t data_size);
     67 
     68 #ifdef __cplusplus
     69 }    // extern "C"
     70 #endif
     71 
     72 #endif  // WEBP_IMAGEIO_IMAGE_DEC_H_