Use metrics returned by GetGlyphOutline in GGO_METRICS mode

GetGlyphOutline Windows API returns wrong values when used with an
OpenType PS font and in GGO_NATIVE mode. It causes problem when
exporting to PDF. The fix changes the GetGlyphOutline call to use
GGO_METRICS instead.

Task-number: QTBUG-12799
Reviewed-by: Eskil Abrahamsen Blomfeldt <[email protected]>
Change-Id: I38ca46d50e490e3b704a89d08b1a8697bca5f079
(cherry picked from qtbase/4aba2d07d2fe67beaf544a4b38c5b9aa8b8ec39b)
Reviewed-by: Oswald Buddenhagen <[email protected]>
Reviewed-by: Konstantin Ritt <[email protected]>
Reviewed-by: Eskil Abrahamsen Blomfeldt <[email protected]>

Author: lasconic

src/gui/text/qfontengine_win.cpp

@@ -864,13 +864,34 @@ static bool addGlyphToPath(glyph_t glyph, const QFixedPoint &position, HDC hdc,
     mat.eM11.fract = mat.eM22.fract = 0;
     mat.eM21.value = mat.eM12.value = 0;
     mat.eM21.fract = mat.eM12.fract = 0;
+
+    GLYPHMETRICS gMetric;
+    memset(&gMetric, 0, sizeof(GLYPHMETRICS));
+
+#ifndef Q_OS_WINCE
+    if (metric) {
+        // If metrics requested, retrieve first using GGO_METRICS, because the returned
+        // values are incorrect for OpenType PS fonts if obtained at the same time as the
+        // glyph paths themselves (ie. with GGO_NATIVE as the format).
+        uint format = GGO_METRICS;
+        if (ttf)
+            format |= GGO_GLYPH_INDEX;
+        int res = GetGlyphOutline(hdc, glyph, format, &gMetric, 0, 0, &mat);
+        if (res == GDI_ERROR) {
+            return false;
+        }
+        // #### obey scale
+        *metric = glyph_metrics_t(gMetric.gmptGlyphOrigin.x, -gMetric.gmptGlyphOrigin.y,
+                                  (int)gMetric.gmBlackBoxX, (int)gMetric.gmBlackBoxY,
+                                  gMetric.gmCellIncX, gMetric.gmCellIncY);
+    }
+#endif
+
     uint glyphFormat = GGO_NATIVE;
 
     if (ttf)
         glyphFormat |= GGO_GLYPH_INDEX;
 
-    GLYPHMETRICS gMetric;
-    memset(&gMetric, 0, sizeof(GLYPHMETRICS));
     int bufferSize = GDI_ERROR;
 #if !defined(Q_WS_WINCE)
     bufferSize = GetGlyphOutline(hdc, glyph, glyphFormat, &gMetric, 0, 0, &mat);
@@ -889,12 +910,14 @@ static bool addGlyphToPath(glyph_t glyph, const QFixedPoint &position, HDC hdc,
         return false;
     }
 
-    if(metric) {
+#ifdef Q_OS_WINCE
+    if (metric) {
         // #### obey scale
         *metric = glyph_metrics_t(gMetric.gmptGlyphOrigin.x, -gMetric.gmptGlyphOrigin.y,
                                   (int)gMetric.gmBlackBoxX, (int)gMetric.gmBlackBoxY,
                                   gMetric.gmCellIncX, gMetric.gmCellIncY);
     }
+#endif
 
     int offset = 0;
     int headerOffset = 0;