blob: 41e73757df9e9b6a2fd05980de7e4d710ec746fb [file] [log] [blame]
* Copyright 2015 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
* This file can parse information from a JPEG using libjpeg (which must be compiled in).
#include "src/pdf/SkJpegInfo.h"
#include "include/codec/SkEncodedOrigin.h"
#include "include/core/SkSize.h"
#include "include/core/SkStream.h"
#include "include/core/SkTypes.h"
#include "include/private/SkEncodedInfo.h"
#include "include/private/base/SkTo.h"
#include "src/codec/SkJpegCodec.h"
#include "src/codec/SkJpegConstants.h"
#include "src/codec/SkJpegDecoderMgr.h"
#include "src/codec/SkJpegPriv.h"
#include <cstddef>
#include <csetjmp>
extern "C" {
#include "jpeglib.h" // NO_G3_REWRITE
bool SkGetJpegInfo(const void* data, size_t len,
SkISize* size,
SkEncodedInfo::Color* colorType,
SkEncodedOrigin* orientation) {
if (!SkJpegCodec::IsJpeg(data, len)) {
return false;
SkMemoryStream stream(data, len);
JpegDecoderMgr decoderMgr(&stream);
// libjpeg errors will be caught and reported here
skjpeg_error_mgr::AutoPushJmpBuf jmp(decoderMgr.errorMgr());
if (setjmp(jmp)) {
return false;
jpeg_decompress_struct* dinfo = decoderMgr.dinfo();
jpeg_save_markers(dinfo, kExifMarker, 0xFFFF);
jpeg_save_markers(dinfo, kICCMarker, 0xFFFF);
jpeg_save_markers(dinfo, kMpfMarker, 0xFFFF);
jpeg_save_markers(dinfo, kGainmapMarker, 0xFFFF);
if (JPEG_HEADER_OK != jpeg_read_header(dinfo, true)) {
return false;
SkEncodedInfo::Color encodedColorType;
if (!decoderMgr.getEncodedColor(&encodedColorType)) {
return false; // Unable to interpret the color channels as colors.
if (colorType) {
*colorType = encodedColorType;
if (orientation) {
*orientation = SkJpegPriv::get_exif_orientation(dinfo);
if (size) {
*size = {SkToS32(dinfo->image_width), SkToS32(dinfo->image_height)};
return true;