Merge branch 'tga-1' of https://github.com/AnyOldName3/osg into AnyOldName3-tga-1
This commit is contained in:
commit
decf339b74
@ -339,7 +339,8 @@ unsigned char *
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simage_tga_load(std::istream& fin,
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int *width_ret,
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int *height_ret,
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int *numComponents_ret)
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int *numComponents_ret,
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bool ignoreTGA2Fields)
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{
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unsigned char header[18];
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unsigned char footer[26];
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@ -382,50 +383,54 @@ int *numComponents_ret)
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fin.seekg(-26, std::ios::end);
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endOfImage = fin.tellg() + (std::streamoff)26;
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fin.read((char*)footer, 26);
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if (fin.gcount() != 26)
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{
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tgaerror = ERR_READ;
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return NULL;
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}
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// TGA footer signature is null-terminated, so works like a C string
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if (strcmp((char*)&footer[8], "TRUEVISION-XFILE.") == 0)
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if (!ignoreTGA2Fields)
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{
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endOfImage -= 26;
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unsigned int extensionAreaOffset = getInt32(&footer[0]);
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unsigned int developerAreaOffset = getInt32(&footer[4]);
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if (extensionAreaOffset != 0)
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fin.read((char*)footer, 26);
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if (fin.gcount() != 26)
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{
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endOfImage = std::min(endOfImage, (std::streampos)extensionAreaOffset);
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// We only need the last few fields of the extension area
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fin.seekg(extensionAreaOffset + 482);
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unsigned char extensionAreaBuffer[13];
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fin.read((char*)extensionAreaBuffer, 13);
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if (fin.gcount() != 13)
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{
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tgaerror = ERR_READ;
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return NULL;
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}
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unsigned int colorCorrectionOffset = getInt32(&extensionAreaBuffer[0]);
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unsigned int postageStampOffset = getInt32(&extensionAreaBuffer[4]);
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unsigned int scanLineOffset = getInt32(&extensionAreaBuffer[8]);
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if (colorCorrectionOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)colorCorrectionOffset);
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if (postageStampOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)postageStampOffset);
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if (scanLineOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)scanLineOffset);
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attributeType = (AttributeType) extensionAreaBuffer[12];
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tgaerror = ERR_READ;
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return NULL;
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}
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if (developerAreaOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)developerAreaOffset);
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// TGA footer signature is null-terminated, so works like a C string
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if (strcmp((char*)&footer[8], "TRUEVISION-XFILE.") == 0)
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{
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endOfImage -= 26;
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unsigned int extensionAreaOffset = getInt32(&footer[0]);
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unsigned int developerAreaOffset = getInt32(&footer[4]);
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if (extensionAreaOffset != 0)
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{
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endOfImage = std::min(endOfImage, (std::streampos)extensionAreaOffset);
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// We only need the last few fields of the extension area
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fin.seekg(extensionAreaOffset + 482);
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unsigned char extensionAreaBuffer[13];
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fin.read((char*)extensionAreaBuffer, 13);
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if (fin.gcount() != 13)
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{
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tgaerror = ERR_READ;
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return NULL;
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}
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unsigned int colorCorrectionOffset = getInt32(&extensionAreaBuffer[0]);
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unsigned int postageStampOffset = getInt32(&extensionAreaBuffer[4]);
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unsigned int scanLineOffset = getInt32(&extensionAreaBuffer[8]);
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if (colorCorrectionOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)colorCorrectionOffset);
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if (postageStampOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)postageStampOffset);
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if (scanLineOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)scanLineOffset);
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attributeType = (AttributeType)extensionAreaBuffer[12];
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}
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if (developerAreaOffset != 0)
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endOfImage = std::min(endOfImage, (std::streampos)developerAreaOffset);
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}
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}
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fin.seekg(18);
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@ -800,18 +805,19 @@ class ReaderWriterTGA : public osgDB::ReaderWriter
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ReaderWriterTGA()
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{
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supportsExtension("tga","Tga Image format");
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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.");
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}
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virtual const char* className() const { return "TGA Image Reader"; }
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ReadResult readTGAStream(std::istream& fin) const
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ReadResult readTGAStream(std::istream& fin, bool ignoreTGA2Fields) const
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{
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unsigned char *imageData = NULL;
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int width_ret;
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int height_ret;
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int numComponents_ret;
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imageData = simage_tga_load(fin,&width_ret,&height_ret,&numComponents_ret);
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imageData = simage_tga_load(fin, &width_ret, &height_ret, &numComponents_ret, ignoreTGA2Fields);
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if (imageData==NULL) return ReadResult::FILE_NOT_HANDLED;
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@ -852,9 +858,9 @@ class ReaderWriterTGA : public osgDB::ReaderWriter
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return readImage(file, options);
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}
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virtual ReadResult readImage(std::istream& fin,const Options* =NULL) const
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virtual ReadResult readImage(std::istream& fin, const Options* options = NULL) const
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{
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return readTGAStream(fin);
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return readTGAStream(fin, options && options->getOptionString().find("ignoreTga2Fields") != std::string::npos);
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}
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virtual ReadResult readImage(const std::string& file, const osgDB::ReaderWriter::Options* options) const
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@ -867,7 +873,7 @@ class ReaderWriterTGA : public osgDB::ReaderWriter
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osgDB::ifstream istream(fileName.c_str(), std::ios::in | std::ios::binary);
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if(!istream) return ReadResult::FILE_NOT_HANDLED;
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ReadResult rr = readTGAStream(istream);
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ReadResult rr = readTGAStream(istream, options && options->getOptionString().find("ignoreTga2Fields") != std::string::npos);
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if(rr.validImage()) rr.getImage()->setFileName(file);
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return rr;
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}
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