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Merged from 3.6 branch "Add option to treat all TGA files as TGA 1.0"

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This commit is contained in:
Robert Osfield 2020-04-29 10:50:22 +01:00
parent 3590e4c057
commit 4a27b7a0a8
1 changed files with 51 additions and 45 deletions
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96
src/osgPlugins/tga/ReaderWriterTGA.cpp
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@ -339,7 +339,8 @@ unsigned char *
simage_tga_load(std::istream& fin,
int *width_ret,
int *height_ret,
int *numComponents_ret)
int *numComponents_ret,
bool ignoreTGA2Fields)
{
unsigned char header[18];
unsigned char footer[26];
@ -382,50 +383,54 @@ int *numComponents_ret)
fin.seekg(-26, std::ios::end);
endOfImage = fin.tellg() + (std::streamoff)26;
fin.read((char*)footer, 26);
if (fin.gcount() != 26)
{
tgaerror = ERR_READ;
return NULL;
}
// TGA footer signature is null-terminated, so works like a C string
if (strcmp((char*)&footer[8], "TRUEVISION-XFILE.") == 0)
if (!ignoreTGA2Fields)
{
endOfImage -= 26;
unsigned int extensionAreaOffset = getInt32(&footer[0]);
unsigned int developerAreaOffset = getInt32(&footer[4]);
if (extensionAreaOffset != 0)
fin.read((char*)footer, 26);
if (fin.gcount() != 26)
{
endOfImage = std::min(endOfImage, (std::streampos)extensionAreaOffset);
// We only need the last few fields of the extension area
fin.seekg(extensionAreaOffset + 482);
unsigned char extensionAreaBuffer[13];
fin.read((char*)extensionAreaBuffer, 13);
if (fin.gcount() != 13)
{
tgaerror = ERR_READ;
return NULL;
}
unsigned int colorCorrectionOffset = getInt32(&extensionAreaBuffer[0]);
unsigned int postageStampOffset = getInt32(&extensionAreaBuffer[4]);
unsigned int scanLineOffset = getInt32(&extensionAreaBuffer[8]);
if (colorCorrectionOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)colorCorrectionOffset);
if (postageStampOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)postageStampOffset);
if (scanLineOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)scanLineOffset);
attributeType = (AttributeType) extensionAreaBuffer[12];
tgaerror = ERR_READ;
return NULL;
}
if (developerAreaOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)developerAreaOffset);
// TGA footer signature is null-terminated, so works like a C string
if (strcmp((char*)&footer[8], "TRUEVISION-XFILE.") == 0)
{
endOfImage -= 26;
unsigned int extensionAreaOffset = getInt32(&footer[0]);
unsigned int developerAreaOffset = getInt32(&footer[4]);
if (extensionAreaOffset != 0)
{
endOfImage = std::min(endOfImage, (std::streampos)extensionAreaOffset);
// We only need the last few fields of the extension area
fin.seekg(extensionAreaOffset + 482);
unsigned char extensionAreaBuffer[13];
fin.read((char*)extensionAreaBuffer, 13);
if (fin.gcount() != 13)
{
tgaerror = ERR_READ;
return NULL;
}
unsigned int colorCorrectionOffset = getInt32(&extensionAreaBuffer[0]);
unsigned int postageStampOffset = getInt32(&extensionAreaBuffer[4]);
unsigned int scanLineOffset = getInt32(&extensionAreaBuffer[8]);
if (colorCorrectionOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)colorCorrectionOffset);
if (postageStampOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)postageStampOffset);
if (scanLineOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)scanLineOffset);
attributeType = (AttributeType)extensionAreaBuffer[12];
}
if (developerAreaOffset != 0)
endOfImage = std::min(endOfImage, (std::streampos)developerAreaOffset);
}
}
fin.seekg(18);
@ -800,18 +805,19 @@ class ReaderWriterTGA : public osgDB::ReaderWriter
ReaderWriterTGA()
{
supportsExtension("tga","Tga Image format");
supportsOption("ignoreTga2Fields", "(Read option) Ignore TGA 2.0 fields, even if present. Makes it possible to read files as a TGA 1.0 reader would, helpful when dealing with malformed TGA 2.0 files which are still valid TGA 1.0 files, such as when an image ends with data resembling a TGA 2.0 footer by coincidence.");
}
virtual const char* className() const { return "TGA Image Reader"; }
ReadResult readTGAStream(std::istream& fin) const
ReadResult readTGAStream(std::istream& fin, bool ignoreTGA2Fields) const
{
unsigned char *imageData = NULL;
int width_ret;
int height_ret;
int numComponents_ret;
imageData = simage_tga_load(fin,&width_ret,&height_ret,&numComponents_ret);
imageData = simage_tga_load(fin, &width_ret, &height_ret, &numComponents_ret, ignoreTGA2Fields);
if (imageData==NULL) return ReadResult::FILE_NOT_HANDLED;
@ -852,9 +858,9 @@ class ReaderWriterTGA : public osgDB::ReaderWriter
return readImage(file, options);
}
virtual ReadResult readImage(std::istream& fin,const Options* =NULL) const
virtual ReadResult readImage(std::istream& fin, const Options* options = NULL) const
{
return readTGAStream(fin);
return readTGAStream(fin, options && options->getOptionString().find("ignoreTga2Fields") != std::string::npos);
}
virtual ReadResult readImage(const std::string& file, const osgDB::ReaderWriter::Options* options) const
@ -867,7 +873,7 @@ class ReaderWriterTGA : public osgDB::ReaderWriter
osgDB::ifstream istream(fileName.c_str(), std::ios::in | std::ios::binary);
if(!istream) return ReadResult::FILE_NOT_HANDLED;
ReadResult rr = readTGAStream(istream);
ReadResult rr = readTGAStream(istream, options && options->getOptionString().find("ignoreTga2Fields") != std::string::npos);
if(rr.validImage()) rr.getImage()->setFileName(file);
return rr;
}