static void BT(IntPtr reserved, IntPtr info)
{
// sadly the parameters are always identical and we can't know the operator name
// IOW we can NOT dispatch (internally) to a nice C# looking method
// We do NOT want people to use the "obvious" new CGPDFScanner(reserved) because that will
// call retain (and this gets called a lot of time)
// So _a_ solution is to provide an helper method to give them what they want
var scanner = CGPDFOperatorTable.GetScannerFromInfo(info);
(scanner.UserInfo as PDFScannerTest).bt_count++;
}
public void Tamarin()
{
using (var table = new CGPDFOperatorTable()) {
// note: the native API is horrible as we can't share the same callback and dispatch it to the right
// managed method. That force every operator to have one ugly, MonoPInvokeCallback-decorated, per
// operator
#if WE_HAD_A_NICE_API
table.SetCallback("BT", delegate(CGPDFScanner scanner) {
bt_count++;
});
table.SetCallback("Do", delegate(CGPDFScanner scanner) {
// ... drill down to the image
});
#elif NET
unsafe {
// BT == new paragraph
table.SetCallback("BT", &BT);
// Do == the image is inside it
table.SetCallback("Do", &Do);
}
#else
// BT == new paragraph
table.SetCallback("BT", BT);
// Do == the image is inside it
table.SetCallback("Do", Do);
#endif
using (var doc = CGPDFDocument.FromFile(NSBundle.MainBundle.PathForResource("Tamarin", "pdf")))
using (var page = doc.GetPage(1))
using (var cs = new CGPDFContentStream(page))
using (var scanner = new CGPDFScanner(cs, table, this)) {
Assert.That(scanner.Handle, Is.Not.EqualTo(IntPtr.Zero), "Handle");
Assert.That(scanner.GetContentStream().Handle, Is.EqualTo(cs.Handle), "GetContentStream");
bt_count = 0;
do_checks = 7;
Assert.True(scanner.Scan(), "Scan");
Assert.That(bt_count, Is.EqualTo(45), "new paragraph");
Assert.That(do_checks, Is.EqualTo(0), "found the image");
}
}
}
static void Do(IntPtr reserved, IntPtr info)
{
// sadly the parameters are always identical and we can't know the operator name
// IOW we can NOT dispatch (internally) to a nice C# looking method
// We do NOT want people to use the "obvious" new CGPDFScanner(reserved) because that will
// call retain (and this gets called a lot of time)
// So _a_ solution is to provide an helper method to give them what they want
var scanner = CGPDFOperatorTable.GetScannerFromInfo(info);
string name;
if (!scanner.TryPopName(out name))
{
return;
}
var test = (scanner.UserInfo as PDFScannerTest);
test.do_checks--;
var cs = scanner.GetContentStream();
if (cs == null)
{
return;
}
test.do_checks--;
var ro = cs.GetResource("XObject", name);
if (ro.Type != CGPDFObjectType.Stream)
{
return;
}
test.do_checks--;
CGPDFStream s;
if (!ro.TryGetValue(out s))
{
return;
}
test.do_checks--;
var dict = s.Dictionary;
if (dict == null)
{
return;
}
test.do_checks--;
string dictname;
if (!dict.GetName("Subtype", out dictname))
{
return;
}
test.do_checks--;
if (dictname != "Image")
{
return;
}
test.do_checks--;
}
public void Default()
{
using (var table = new CGPDFOperatorTable()) {
Assert.That(table.Handle, Is.Not.EqualTo(IntPtr.Zero), "Handle");
}
}
