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move examples/{example_util,image_dec} to imageio/

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Change-Id: I2508c786a095a2a75bebf766210c64e2af88f9b6
This commit is contained in:
James Zern
2016-07-19 16:02:55 -07:00
parent ad497fbce3
commit c379b55a93
33 changed files with 158 additions and 143 deletions
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46
imageio/image_dec.c Normal file
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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Generic image-type guessing.
#include "./image_dec.h"
static WEBP_INLINE uint32_t GetBE32(const uint8_t buf[]) {
return ((uint32_t)buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
}
WebPInputFileFormat WebPGuessImageType(const uint8_t* const data,
size_t data_size) {
WebPInputFileFormat format = WEBP_UNSUPPORTED_FORMAT;
if (data != NULL && data_size >= 12) {
const uint32_t magic1 = GetBE32(data + 0);
const uint32_t magic2 = GetBE32(data + 8);
if (magic1 == 0x89504E47U) {
format = WEBP_PNG_FORMAT;
} else if (magic1 >= 0xFFD8FF00U && magic1 <= 0xFFD8FFFFU) {
format = WEBP_JPEG_FORMAT;
} else if (magic1 == 0x49492A00 || magic1 == 0x4D4D002A) {
format = WEBP_TIFF_FORMAT;
} else if (magic1 == 0x52494646 && magic2 == 0x57454250) {
format = WEBP_WEBP_FORMAT;
}
}
return format;
}
WebPImageReader WebPGuessImageReader(const uint8_t* const data,
size_t data_size) {
switch (WebPGuessImageType(data, data_size)) {
case WEBP_PNG_FORMAT: return ReadPNG;
case WEBP_JPEG_FORMAT: return ReadJPEG;
case WEBP_TIFF_FORMAT: return ReadTIFF;
case WEBP_WEBP_FORMAT: return ReadWebP;
default: return NULL;
}
}