tdf#124752: Simplify the iOS DataFlavorMapping thing a lot

Now it works to copy and paste images (PNG ones at least) between the
iOS Collabora Office app and other apps.

We don't seem to need the PNGDataProvider after all, as we use it only
for data that is already in PNG format. Possibly I am missing
somethin, though.

Change-Id: Ia6bcc8aefbe1a6687f13e28454b96658fc66c856

vcl/ios/DataFlavorMapping.cxx

@@ -47,65 +47,6 @@ using namespace cppu;
 
 namespace
 {
-bool ImageToPNG(css::uno::Sequence<sal_Int8> const& rImgData,
-                css::uno::Sequence<sal_Int8>& rPngData)
-{
-#if 1
-    // Skip this complexity for now. Work in progress.
-    (void)rImgData;
-    (void)rPngData;
-    return false;
-#else
-    NSData* pData = [NSData dataWithBytesNoCopy:const_cast<sal_Int8*>(rImgData.getConstArray())
-                                         length:rImgData.getLength()
-                                   freeWhenDone:0];
-    if (!pData)
-        return false;
-
-    NSBitmapImageRep* pRep = [NSBitmapImageRep imageRepWithData:pData];
-    if (!pRep)
-        return false;
-
-    NSData* pOut = [pRep representationUsingType:NSPNGFileType properties:@{}];
-    if (!pOut)
-        return false;
-
-    const size_t nPngSize = [pOut length];
-    rPngData.realloc(nPngSize);
-    [pOut getBytes:rPngData.getArray() length:nPngSize];
-    return (nPngSize > 0);
-#endif
-}
-
-bool PNGToImage(css::uno::Sequence<sal_Int8> const& rPngData,
-                css::uno::Sequence<sal_Int8>& rImgData)
-{
-#if 1
-    (void)rPngData;
-    (void)rImgData;
-    return false;
-#else
-    NSData* pData = [NSData dataWithBytesNoCopy:const_cast<sal_Int8*>(rPngData.getConstArray())
-                                         length:rPngData.getLength()
-                                   freeWhenDone:0];
-    if (!pData)
-        return false;
-
-    NSBitmapImageRep* pRep = [NSBitmapImageRep imageRepWithData:pData];
-    if (!pRep)
-        return false;
-
-    NSData* pOut = [pRep representationUsingType:eOutFormat properties:@{}];
-    if (!pOut)
-        return false;
-
-    const size_t nImgSize = [pOut length];
-    rImgData.realloc(nImgSize);
-    [pOut getBytes:rImgData.getArray() length:nImgSize];
-    return (nImgSize > 0);
-#endif
-}
-
 /* Determine whether or not a DataFlavor is valid.
    */
 bool isValidFlavor(const DataFlavor& aFlavor)
@@ -397,61 +338,6 @@ Any HTMLFormatDataProvider::getOOoData()
     return oOOData;
 }
 
-class PNGDataProvider : public DataProviderBaseImpl
-{
-public:
-    PNGDataProvider(const Any&);
-    PNGDataProvider(NSData*);
-
-    NSData* getSystemData() override;
-    Any getOOoData() override;
-};
-
-PNGDataProvider::PNGDataProvider(const Any& data)
-    : DataProviderBaseImpl(data)
-{
-}
-
-PNGDataProvider::PNGDataProvider(NSData* data)
-    : DataProviderBaseImpl(data)
-{
-}
-
-NSData* PNGDataProvider::getSystemData()
-{
-    Sequence<sal_Int8> pngData;
-    mData >>= pngData;
-
-    Sequence<sal_Int8> imgData;
-    NSData* sysData = nullptr;
-    if (PNGToImage(pngData, imgData))
-        sysData = [NSData dataWithBytes:imgData.getArray() length:imgData.getLength()];
-
-    return sysData;
-}
-
-Any PNGDataProvider::getOOoData()
-{
-    Any oOOData;
-
-    if (mSystemData)
-    {
-        const unsigned int flavorDataLength = [mSystemData length];
-        Sequence<sal_Int8> imgData(flavorDataLength);
-        memcpy(imgData.getArray(), [mSystemData bytes], flavorDataLength);
-
-        Sequence<sal_Int8> pngData;
-        if (ImageToPNG(imgData, pngData))
-            oOOData <<= pngData;
-    }
-    else
-    {
-        oOOData = mData;
-    }
-
-    return oOOData;
-}
-
 DataFlavorMapper::DataFlavorMapper()
 {
     Reference<XComponentContext> xContext = comphelper::getProcessComponentContext();
@@ -565,14 +451,7 @@ DataFlavorMapper::getDataProvider(const NSString* systemFlavor,
 
         if (isByteSequenceType(data.getValueType()))
         {
-            if ([systemFlavor caseInsensitiveCompare:PBTYPE_PNG] == NSOrderedSame)
-            {
-                dp = DataProviderPtr_t(new PNGDataProvider(data));
-            }
-            else
-            {
-                dp = DataProviderPtr_t(new ByteSequenceDataProvider(data));
-            }
+            dp = DataProviderPtr_t(new ByteSequenceDataProvider(data));
         }
         else // Must be OUString type
         {
@@ -602,10 +481,6 @@ DataProviderPtr_t DataFlavorMapper::getDataProvider(const NSString* systemFlavor
     {
         dp = DataProviderPtr_t(new HTMLFormatDataProvider(systemData));
     }
-    else if ([systemFlavor caseInsensitiveCompare:PBTYPE_PNG] == NSOrderedSame)
-    {
-        dp = DataProviderPtr_t(new PNGDataProvider(systemData));
-    }
     else
     {
         dp = DataProviderPtr_t(new ByteSequenceDataProvider(systemData));