| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "src/codec/SkJpegDecoderMgr.h" |
| |
| #include "src/codec/SkCodecPriv.h" |
| #include "src/codec/SkJpegUtility.h" |
| |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| #include "include/android/SkAndroidFrameworkUtils.h" |
| #endif |
| |
| class SkStream; |
| |
| /* |
| * Print information, warning, and error messages |
| */ |
| static void print_message(const j_common_ptr info, const char caller[]) { |
| char buffer[JMSG_LENGTH_MAX]; |
| info->err->format_message(info, buffer); |
| SkCodecPrintf("libjpeg error %d <%s> from %s\n", info->err->msg_code, buffer, caller); |
| } |
| |
| /* |
| * Reporting function for error and warning messages. |
| */ |
| static void output_message(j_common_ptr info) { |
| print_message(info, "output_message"); |
| } |
| |
| static void progress_monitor(j_common_ptr info) { |
| int scan = ((j_decompress_ptr)info)->input_scan_number; |
| // Progressive images with a very large number of scans can cause the |
| // decoder to hang. Here we use the progress monitor to abort on |
| // a very large number of scans. 100 is arbitrary, but much larger |
| // than the number of scans we might expect in a normal image. |
| if (scan >= 100) { |
| skjpeg_err_exit(info); |
| } |
| } |
| |
| bool JpegDecoderMgr::returnFalse(const char caller[]) { |
| print_message((j_common_ptr) &fDInfo, caller); |
| return false; |
| } |
| |
| SkCodec::Result JpegDecoderMgr::returnFailure(const char caller[], SkCodec::Result result) { |
| print_message((j_common_ptr) &fDInfo, caller); |
| return result; |
| } |
| |
| bool JpegDecoderMgr::getEncodedColor(SkEncodedInfo::Color* outColor) { |
| switch (fDInfo.jpeg_color_space) { |
| case JCS_GRAYSCALE: |
| *outColor = SkEncodedInfo::kGray_Color; |
| return true; |
| case JCS_YCbCr: |
| *outColor = SkEncodedInfo::kYUV_Color; |
| return true; |
| case JCS_RGB: |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| SkAndroidFrameworkUtils::SafetyNetLog("118372692"); |
| #endif |
| *outColor = SkEncodedInfo::kRGB_Color; |
| return true; |
| case JCS_YCCK: |
| *outColor = SkEncodedInfo::kYCCK_Color; |
| return true; |
| case JCS_CMYK: |
| *outColor = SkEncodedInfo::kInvertedCMYK_Color; |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| JpegDecoderMgr::JpegDecoderMgr(SkStream* stream) |
| : fSrcMgr(stream) |
| , fInit(false) |
| { |
| // Error manager must be set before any calls to libjeg in order to handle failures |
| fDInfo.err = jpeg_std_error(&fErrorMgr); |
| fErrorMgr.error_exit = skjpeg_err_exit; |
| } |
| |
| void JpegDecoderMgr::init() { |
| jpeg_create_decompress(&fDInfo); |
| fInit = true; |
| fDInfo.src = &fSrcMgr; |
| fDInfo.err->output_message = &output_message; |
| fDInfo.progress = &fProgressMgr; |
| fProgressMgr.progress_monitor = &progress_monitor; |
| } |
| |
| JpegDecoderMgr::~JpegDecoderMgr() { |
| if (fInit) { |
| jpeg_destroy_decompress(&fDInfo); |
| } |
| } |