QEdidParser: optimize the hardcoded EDID vendor table

Instead of using an array of fixed-length strings for the vendor names,
use qOffsetStringArray instead. This removes the need of using the
longest vendor name length as the size of the fixed-length strings,
which results in a massive waste of space. This saves 150KB of
(readonly) data.

Details: there are 2555 entries, each one hardcoded to be 78 byte long,
for a total of 199290 bytes. However the vendor names themselves amount
only to 50658 bytes.

Making all this data optional on desktop Linux (where the vendor data is
present anyhow on the system, in /usr/share/) is left for a future
change.

Change-Id: I17007865e741e3dab15dd2ab2feffbce4664fb37
Reviewed-by: Volker Hilsheimer <[email protected]>

src/gui/util/qedidparser.cpp

@@ -124,20 +124,20 @@ bool QEdidParser::parse(const QByteArray &blob)
 
     if (manufacturer.isEmpty()) {
         // Find the manufacturer from the vendor lookup table
-        const auto compareVendorId = [](const VendorTable &vendor, const char *str)
+        const auto compareVendorId = [](const QEdidVendorId &vendor, const char *str)
         {
             return strncmp(vendor.id, str, 3) < 0;
         };
 
-        const auto b = std::begin(q_edidVendorTable);
-        const auto e = std::end(q_edidVendorTable);
+        const auto b = std::begin(q_edidVendorIds);
+        const auto e = std::end(q_edidVendorIds);
         auto it = std::lower_bound(b,
                                    e,
                                    pnpId,
                                    compareVendorId);
 
         if (it != e && strncmp(it->id, pnpId, 3) == 0)
-            manufacturer = QString::fromUtf8(it->name);
+            manufacturer = QString::fromUtf8(q_edidVendorNames + q_edidVendorNamesOffsets[it - b]);
     }
 
     // If we don't know the manufacturer, fallback to PNP ID