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96 lines
3.9 KiB
C
96 lines
3.9 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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// Utility functions used by the example programs.
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//
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#ifndef WEBP_IMAGEIO_EXAMPLE_UTIL_H_
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#define WEBP_IMAGEIO_EXAMPLE_UTIL_H_
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#include <stdio.h>
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#include "webp/decode.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// String parsing
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// Parses 'v' using strto(ul|l|d)(). If error is non-NULL, '*error' is set to
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// true on failure while on success it is left unmodified to allow chaining of
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// calls. An error is only printed on the first occurrence.
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uint32_t ExUtilGetUInt(const char* const v, int base, int* const error);
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int ExUtilGetInt(const char* const v, int base, int* const error);
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float ExUtilGetFloat(const char* const v, int* const error);
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//------------------------------------------------------------------------------
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// File I/O
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// Reopen file in binary (O_BINARY) mode.
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// Returns 'file' on success, NULL otherwise.
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FILE* ExUtilSetBinaryMode(FILE* file);
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// Allocates storage for entire file 'file_name' and returns contents and size
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// in 'data' and 'data_size'. Returns 1 on success, 0 otherwise. '*data' should
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// be deleted using free().
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// If 'file_name' is NULL or equal to "-", input is read from stdin by calling
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// the function ExUtilReadFromStdin().
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int ExUtilReadFile(const char* const file_name,
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const uint8_t** data, size_t* data_size);
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// Same as ExUtilReadFile(), but reads until EOF from stdin instead.
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int ExUtilReadFromStdin(const uint8_t** data, size_t* data_size);
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// Write a data segment into a file named 'file_name'. Returns true if ok.
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// If 'file_name' is NULL or equal to "-", output is written to stdout.
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int ExUtilWriteFile(const char* const file_name,
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const uint8_t* data, size_t data_size);
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//------------------------------------------------------------------------------
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// Copy width x height pixels from 'src' to 'dst' honoring the strides.
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void ExUtilCopyPlane(const uint8_t* src, int src_stride,
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uint8_t* dst, int dst_stride, int width, int height);
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//------------------------------------------------------------------------------
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// WebP decoding
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// Prints an informative error message regarding decode failure of 'in_file'.
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// 'status' is treated as a VP8StatusCode and if valid will be printed as a
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// text string.
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void ExUtilPrintWebPError(const char* const in_file, int status);
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// Reads a WebP from 'in_file', returning the contents and size in 'data' and
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// 'data_size'. If not NULL, 'bitstream' is populated using WebPGetFeatures().
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// Returns true on success.
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int ExUtilLoadWebP(const char* const in_file,
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const uint8_t** data, size_t* data_size,
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WebPBitstreamFeatures* bitstream);
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// Decodes the WebP contained in 'data'.
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// 'config' is a structure previously initialized by WebPInitDecoderConfig().
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// 'config->output' should have the desired colorspace selected. 'verbose' will
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// cause decode timing to be reported.
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// Returns the decoder status. On success 'config->output' will contain the
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// decoded picture.
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VP8StatusCode ExUtilDecodeWebP(const uint8_t* const data, size_t data_size,
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int verbose, WebPDecoderConfig* const config);
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// Same as ExUtilDecodeWebP(), but using the incremental decoder.
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VP8StatusCode ExUtilDecodeWebPIncremental(
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const uint8_t* const data, size_t data_size,
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int verbose, WebPDecoderConfig* const config);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // WEBP_IMAGEIO_EXAMPLE_UTIL_H_
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