std::string ImageUtils::identifyMimeType(const std::string& fileName)
{
std::vector<unsigned char> header = FileUtils::fileHeader(fileName, 25);
if (header.empty())
return "";
else
return identifyMimeType(header);
}
WPoint ImageUtils::getSize(const std::string& fileName)
{
std::vector<unsigned char> header =
FileUtils::fileHeader(fileName, 25);
if (header.empty())
return WPoint();
else{
std::string mimeType = identifyMimeType(header);
if (mimeType == "image/jpeg")
return getJpegSize(fileName);
else
return getSize(header);
}
}
WPoint ImageUtils::getSize(const std::vector<unsigned char>& header)
{
/*
* Contributed by Daniel Derr @ ArrowHead Electronics Health-Care
*/
std::string mimeType = identifyMimeType(header);
if (mimeType == "image/png") {
int width = ( ( ( toUnsigned(header[16]) << 8
| toUnsigned(header[17])) << 8
| toUnsigned(header[18])) << 8
| toUnsigned(header[19]));
int height = ( ( ( toUnsigned(header[20]) << 8
| toUnsigned(header[21])) << 8
| toUnsigned(header[22])) << 8
| toUnsigned(header[23]));
return WPoint(width, height);
} else if (mimeType == "image/gif") {
int width = toUnsigned(header[7]) << 8 | toUnsigned(header[6]);
int height = toUnsigned(header[9]) << 8 | toUnsigned(header[8]);
return WPoint(width, height);
} else
return WPoint();
}
