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 */
print_message(const j_common_ptr info,const char caller[])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 */
output_message(j_common_ptr info)23 static void output_message(j_common_ptr info) {
24 print_message(info, "output_message");
25 }
26
returnFalse(const char caller[])27 bool JpegDecoderMgr::returnFalse(const char caller[]) {
28 print_message((j_common_ptr) &fDInfo, caller);
29 return false;
30 }
31
returnFailure(const char caller[],SkCodec::Result result)32 SkCodec::Result JpegDecoderMgr::returnFailure(const char caller[], SkCodec::Result result) {
33 print_message((j_common_ptr) &fDInfo, caller);
34 return result;
35 }
36
getColorType()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
JpegDecoderMgr(SkStream * stream)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
init()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
~JpegDecoderMgr()62 JpegDecoderMgr::~JpegDecoderMgr() {
63 if (fInit) {
64 jpeg_destroy_decompress(&fDInfo);
65 }
66 }
67
getJmpBuf()68 jmp_buf& JpegDecoderMgr::getJmpBuf() {
69 return fErrorMgr.fJmpBuf;
70 }
71
dinfo()72 jpeg_decompress_struct* JpegDecoderMgr::dinfo() {
73 return &fDInfo;
74 }
75