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https://github.com/webmproject/libwebp.git
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44257cb826
(Debian clang-format version 19.1.7 (3+build4)) with `--style=Google`. Manual changes: * clang-format disabled around macros with stringification (mostly assembly) * some inline assembly strings were adjusted to avoid awkward line breaks * trailing commas, `//` or suffixes (`ull`) added to help array formatting * thread_utils.c: parameter comments were changed to the more common /*...=*/ style to improve formatting The automatically generated code under swig/ was skipped. Bug: 433996651 Change-Id: Iea3f24160d78d2a2653971cdf13fa932e47ff1b3
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
// Copyright 2016 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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// Generic image-type guessing.
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#include "./image_dec.h"
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#include <stddef.h>
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#include "./metadata.h"
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#include "webp/encode.h"
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#include "webp/types.h"
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const char* WebPGetEnabledInputFileFormats(void) {
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return "WebP"
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#ifdef WEBP_HAVE_JPEG
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", JPEG"
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#endif
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#ifdef WEBP_HAVE_PNG
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", PNG"
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#endif
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", PNM (PGM, PPM, PAM)"
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#ifdef WEBP_HAVE_TIFF
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", TIFF"
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#endif
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#ifdef HAVE_WINCODEC_H
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", Windows Imaging Component (WIC)"
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#endif
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"";
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}
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static WEBP_INLINE uint32_t GetBE32(const uint8_t buf[]) {
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return ((uint32_t)buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
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}
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WebPInputFileFormat WebPGuessImageType(const uint8_t* const data,
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size_t data_size) {
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WebPInputFileFormat format = WEBP_UNSUPPORTED_FORMAT;
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if (data != NULL && data_size >= 12) {
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const uint32_t magic1 = GetBE32(data + 0);
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const uint32_t magic2 = GetBE32(data + 8);
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if (magic1 == 0x89504E47U) {
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format = WEBP_PNG_FORMAT;
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} else if (magic1 >= 0xFFD8FF00U && magic1 <= 0xFFD8FFFFU) {
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format = WEBP_JPEG_FORMAT;
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} else if (magic1 == 0x49492A00 || magic1 == 0x4D4D002A) {
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format = WEBP_TIFF_FORMAT;
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} else if (magic1 == 0x52494646 && magic2 == 0x57454250) {
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format = WEBP_WEBP_FORMAT;
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} else if (((magic1 >> 24) & 0xff) == 'P') {
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const int type = (magic1 >> 16) & 0xff;
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// we only support 'P5 -> P7' for now.
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if (type >= '5' && type <= '7') format = WEBP_PNM_FORMAT;
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}
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}
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return format;
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}
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static int FailReader(const uint8_t* const data, size_t data_size,
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struct WebPPicture* const pic, int keep_alpha,
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struct Metadata* const metadata) {
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(void)data;
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(void)data_size;
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(void)pic;
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(void)keep_alpha;
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(void)metadata;
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return 0;
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}
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WebPImageReader WebPGetImageReader(WebPInputFileFormat format) {
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switch (format) {
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case WEBP_PNG_FORMAT:
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return ReadPNG;
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case WEBP_JPEG_FORMAT:
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return ReadJPEG;
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case WEBP_TIFF_FORMAT:
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return ReadTIFF;
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case WEBP_WEBP_FORMAT:
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return ReadWebP;
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case WEBP_PNM_FORMAT:
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return ReadPNM;
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default:
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return FailReader;
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}
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}
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WebPImageReader WebPGuessImageReader(const uint8_t* const data,
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size_t data_size) {
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return WebPGetImageReader(WebPGuessImageType(data, data_size));
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}
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