template<class ArrayT>
| void Impala::Core::Array::ReadImageFromMemory | ( | ArrayT *& | dst, | |
| char * | buf, | |||
| int | bufsize | |||
| ) | [inline] |
ReadImageFromMemory automatically identifies whether there is a PNG or JPG image stored there.
JPG data can be stored using JFIF or using Exif; this code identifies both as JPG.
Definition at line 21 of file ReadImage.h.
References ILOG_ERROR, ILOG_VAR, ReadJpgFromMemory(), and ReadPngFromMemory().
Referenced by Impala::Core::IDash::VideoSetWrapper::CheckFrameSizes(), Impala::Application::Videolympics::RawImageDataset::GetImage(), Impala::Core::Array::ImageArchiveMemory::ReadImage(), Impala::Core::Array::ImageArchiveMapi::ReadImage(), Impala::Core::Array::ImageArchiveFileFset::ReadImage(), and Impala::Core::Array::ImageArchiveFile::ReadImage().
00022 { 00023 ILOG_VAR(Impala.Core.Array.ReadImageFromMemory); 00024 if (bufsize < 14) 00025 { 00026 ILOG_ERROR("Buffer size too small to identify file: " << bufsize 00027 << " bytes"); 00028 return; 00029 } 00030 00031 // PNG image (first 8 bytes are always the same) 00032 if (((buf[0] == -119) || (buf[0] == 137)) && // 0x89 (signed stuff is... annoying) 00033 (buf[1] == 0x50) && 00034 (buf[2] == 0x4e) && 00035 (buf[3] == 0x47) && 00036 (buf[4] == 0x0d) && 00037 (buf[5] == 0x0a) && 00038 (buf[6] == 0x1a) && 00039 (buf[7] == 0x0a)) 00040 { 00041 ReadPngFromMemory(dst, buf, bufsize); 00042 return; 00043 } 00044 00045 // ordinary JFIF JPEG 00046 if ((buf[0] == -1) && // 0xff 00047 (buf[1] == -40) && // 0xd8 00048 (buf[2] == -1) && // 0xff application marker 00049 //(buf[3] == 0xe0) && // application marker 00050 // // (this part can be e0..ef or anything?) 00051 (buf[6] == 0x4a) && // J 00052 (buf[7] == 0x46) && // F 00053 (buf[8] == 0x49) && // I 00054 (buf[9] == 0x46) && // F 00055 (buf[10] == 0x00)) 00056 { 00057 ReadJpgFromMemory(dst, buf, bufsize); 00058 return; 00059 } 00060 00061 // Exif JPEG ...not tested... 00062 //is the "Exif" part required to be in this exact location? 00063 if ((buf[0] == -1) && // 0xff 00064 (buf[1] == -40) && // 0xd8 00065 (buf[2] == -1) && // 0xff application marker 00066 (buf[3] == -31) && // 0xe1 application marker 00067 // (this part has to be e1 for exif) 00068 (buf[8] == 0x45) && // E 00069 (buf[9] == 0x78) && // x 00070 (buf[10] == 0x69) && // i 00071 (buf[11] == 0x66) && // f 00072 (buf[12] == 0x00) && // \0 00073 (buf[13] == 0x00)) // \0 00074 { 00075 ReadJpgFromMemory(dst, buf, bufsize); 00076 return; 00077 } 00078 // Exif JPEG 2nd form: Exif 2 bytes back 00079 //is the "Exif" part required to be in this exact location? 00080 if ((buf[0] == -1) && // 0xff 00081 (buf[1] == -40) && // 0xd8 00082 (buf[2] == -1) && // 0xff application marker 00083 (buf[3] == -31) && // 0xe1 application marker 00084 // (this part has to be e1 for exif) 00085 (buf[6] == 0x45) && // E 00086 (buf[7] == 0x78) && // x 00087 (buf[8] == 0x69) && // i 00088 (buf[9] == 0x66) && // f 00089 (buf[10] == 0x00) && // \0 00090 (buf[11] == 0x00)) // \0 00091 { 00092 ReadJpgFromMemory(dst, buf, bufsize); 00093 return; 00094 } 00095 00096 00097 ILOG_ERROR("Unknown image file format! " << int(buf[0]) << " " << 00098 int(buf[1]) << " " << int(buf[2]) << " " << int(buf[3]) << " " 00099 << int(buf[4]) << " " << int(buf[5]) << " " << int(buf[6]) << 00100 " " << int(buf[7]) << " " << int(buf[8]) << " " << int(buf[9]) 00101 << " " << int(buf[10]) << " " << int(buf[11])); 00102 }
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