Detect presence of dwrite_1.h.

src/ports/SkScalerContext_win_dw.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTypes.h"
 #undef GetGlyphIndices
 
 #include "SkDWrite.h"
 #include "SkDWriteGeometrySink.h"
 #include "SkEndian.h"
 #include "SkGlyph.h"
 #include "SkHRESULT.h"
 #include "SkMaskGamma.h"
 #include "SkMatrix22.h"
 #include "SkOTTable_EBLC.h"
 #include "SkOTTable_EBSC.h"
 #include "SkOTTable_gasp.h"
 #include "SkOTTable_maxp.h"
 #include "SkPath.h"
 #include "SkScalerContext.h"
 #include "SkScalerContext_win_dw.h"
 #include "SkTScopedComPtr.h"
 #include "SkTypeface_win_dw.h"
 
 #include <dwrite.h>
-#include <dwrite_1.h>
+#if SK_HAS_DWRITE_1_H
+#  include <dwrite_1.h>
+#endif
 
 static bool isLCD(const SkScalerContext::Rec& rec) {
     return SkMask::kLCD16_Format == rec.fMaskFormat ||
            SkMask::kLCD32_Format == rec.fMaskFormat;
 }
 
 static bool is_hinted_without_gasp(DWriteFontTypeface* typeface) {
     AutoTDWriteTable<SkOTTableMaximumProfile> maxp(typeface->fDWriteFontFace.get());
     if (!maxp.fExists) {
         return false;
@@ skipping 477 matching lines @@
     metrics->fAscent = -fTextSizeRender * SkIntToScalar(dwfm.ascent) / upem;
     metrics->fDescent = fTextSizeRender * SkIntToScalar(dwfm.descent) / upem;
     metrics->fLeading = fTextSizeRender * SkIntToScalar(dwfm.lineGap) / upem;
     metrics->fXHeight = fTextSizeRender * SkIntToScalar(dwfm.xHeight) / upem;
     metrics->fUnderlineThickness = fTextSizeRender * SkIntToScalar(dwfm.underlineThickness) / upem;
     metrics->fUnderlinePosition = -(fTextSizeRender * SkIntToScalar(dwfm.underlinePosition) / upem);
 
     metrics->fFlags |= SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag;
     metrics->fFlags |= SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag;
 
+#if SK_HAS_DWRITE_1_H
     if (fTypeface->fDWriteFontFace1.get()) {
         DWRITE_FONT_METRICS1 dwfm1;
         fTypeface->fDWriteFontFace1->GetMetrics(&dwfm1);
         metrics->fTop = -fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxTop) / upem;
         metrics->fBottom = -fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxBottom) / upem;
         metrics->fXMin = fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxLeft) / upem;
         metrics->fXMax = fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxRight) / upem;
 
         metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
-    } else {
-        AutoTDWriteTable<SkOTTableHead> head(fTypeface->fDWriteFontFace.get());
-        if (head.fExists &&
-            head.fSize >= sizeof(SkOTTableHead) &&
-            head->version == SkOTTableHead::version1)
-        {
-            metrics->fTop = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMax) / upem;
-            metrics->fBottom = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMin) / upem;
-            metrics->fXMin = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMin) / upem;
-            metrics->fXMax = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMax) / upem;
+        return;
+    }
+#else
+#  pragma message("No dwrite_1.h is available, font metrics may be affected.")
+#endif
 
-            metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
-        } else {
-            metrics->fTop = metrics->fAscent;
-            metrics->fBottom = metrics->fDescent;
-        }
+    AutoTDWriteTable<SkOTTableHead> head(fTypeface->fDWriteFontFace.get());
+    if (head.fExists &&
+        head.fSize >= sizeof(SkOTTableHead) &&
+        head->version == SkOTTableHead::version1)
+    {
+        metrics->fTop = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMax) / upem;
+        metrics->fBottom = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMin) / upem;
+        metrics->fXMin = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMin) / upem;
+        metrics->fXMax = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMax) / upem;
+
+        metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
+        return;
     }
+
+    metrics->fTop = metrics->fAscent;
+    metrics->fBottom = metrics->fDescent;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "SkColorPriv.h"
 
 static void bilevel_to_bw(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph) {
     const int width = glyph.fWidth;
     const size_t dstRB = (width + 7) >> 3;
     uint8_t* SK_RESTRICT dst = static_cast<uint8_t*>(glyph.fImage);
@@ skipping 203 matching lines @@
                                        NULL, //advances
                                        NULL, //offsets
                                        1, //num glyphs
                                        FALSE, //sideways
                                        FALSE, //rtl
                                        geometryToPath.get()),
          "Could not create glyph outline.");
 
     path->transform(fSkXform);
 }