1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkJpegDecoderMgr.h" 9 #include "SkJpegUtility_codec.h" 10 11 /* 12 * Print information, warning, and error messages 13 */ 14 static void print_message(const j_common_ptr info, const char caller[]) { 15 char buffer[JMSG_LENGTH_MAX]; 16 info->err->format_message(info, buffer); 17 SkCodecPrintf("libjpeg error %d <%s> from %s\n", info->err->msg_code, buffer, caller); 18 } 19 20 /* 21 * Reporting function for error and warning messages. 22 */ 23 static void output_message(j_common_ptr info) { 24 print_message(info, "output_message"); 25 } 26 27 bool JpegDecoderMgr::returnFalse(const char caller[]) { 28 print_message((j_common_ptr) &fDInfo, caller); 29 return false; 30 } 31 32 SkCodec::Result JpegDecoderMgr::returnFailure(const char caller[], SkCodec::Result result) { 33 print_message((j_common_ptr) &fDInfo, caller); 34 return result; 35 } 36 37 SkColorType JpegDecoderMgr::getColorType() { 38 switch (fDInfo.jpeg_color_space) { 39 case JCS_GRAYSCALE: 40 return kGray_8_SkColorType; 41 default: 42 return kN32_SkColorType; 43 } 44 } 45 46 JpegDecoderMgr::JpegDecoderMgr(SkStream* stream) 47 : fSrcMgr(stream) 48 , fInit(false) 49 { 50 // Error manager must be set before any calls to libjeg in order to handle failures 51 fDInfo.err = jpeg_std_error(&fErrorMgr); 52 fErrorMgr.error_exit = skjpeg_err_exit; 53 } 54 55 void JpegDecoderMgr::init() { 56 jpeg_create_decompress(&fDInfo); 57 fInit = true; 58 fDInfo.src = &fSrcMgr; 59 fDInfo.err->output_message = &output_message; 60 } 61 62 JpegDecoderMgr::~JpegDecoderMgr() { 63 if (fInit) { 64 jpeg_destroy_decompress(&fDInfo); 65 } 66 } 67 68 jmp_buf& JpegDecoderMgr::getJmpBuf() { 69 return fErrorMgr.fJmpBuf; 70 } 71 72 jpeg_decompress_struct* JpegDecoderMgr::dinfo() { 73 return &fDInfo; 74 } 75
