go-libwebp

Experimental translation from libwebp to Go source.
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webpdec.h (2598B)

      1 // Copyright 2014 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 // WebP decode.
     11 
     12 #ifndef WEBP_IMAGEIO_WEBPDEC_H_
     13 #define WEBP_IMAGEIO_WEBPDEC_H_
     14 
     15 #include <stddef.h>
     16 
     17 #include "webp/decode.h"
     18 #include "webp/types.h"
     19 
     20 #ifdef __cplusplus
     21 extern "C" {
     22 #endif
     23 
     24 struct Metadata;
     25 struct WebPPicture;
     26 
     27 //------------------------------------------------------------------------------
     28 // WebP decoding
     29 
     30 // Prints an informative error message regarding decode failure of 'in_file'.
     31 // 'status' is treated as a VP8StatusCode and if valid will be printed as a
     32 // text string.
     33 void PrintWebPError(const char* const in_file, int status);
     34 
     35 // Reads a WebP from 'in_file', returning the contents and size in 'data' and
     36 // 'data_size'. If not NULL, 'bitstream' is populated using WebPGetFeatures().
     37 // Returns true on success.
     38 int LoadWebP(const char* const in_file,
     39              const uint8_t** data, size_t* data_size,
     40              WebPBitstreamFeatures* bitstream);
     41 
     42 // Decodes the WebP contained in 'data'.
     43 // 'config' is a structure previously initialized by WebPInitDecoderConfig().
     44 // 'config->output' should have the desired colorspace selected.
     45 // Returns the decoder status. On success 'config->output' will contain the
     46 // decoded picture.
     47 VP8StatusCode DecodeWebP(const uint8_t* const data, size_t data_size,
     48                          WebPDecoderConfig* const config);
     49 
     50 // Same as DecodeWebP(), but using the incremental decoder.
     51 VP8StatusCode DecodeWebPIncremental(
     52     const uint8_t* const data, size_t data_size,
     53     WebPDecoderConfig* const config);
     54 
     55 //------------------------------------------------------------------------------
     56 
     57 // Decodes a WebP contained in 'data', returning the decoded output in 'pic'.
     58 // Output is RGBA or YUVA, depending on pic->use_argb value.
     59 // If 'keep_alpha' is true and the WebP has an alpha channel, the output is RGBA
     60 // or YUVA. Otherwise, alpha channel is dropped and output is RGB or YUV.
     61 // Returns true on success.
     62 int ReadWebP(const uint8_t* const data, size_t data_size,
     63              struct WebPPicture* const pic,
     64              int keep_alpha, struct Metadata* const metadata);
     65 
     66 #ifdef __cplusplus
     67 }    // extern "C"
     68 #endif
     69 
     70 #endif  // WEBP_IMAGEIO_WEBPDEC_H_