Revert of Support pixel antialising in DirectWrite.

src/ports/SkScalerContext_win_dw.cpp

Index: src/ports/SkScalerContext_win_dw.cpp
diff --git a/src/ports/SkScalerContext_win_dw.cpp b/src/ports/SkScalerContext_win_dw.cpp
index 6deeb66ff663c8a2d66f95536ed3d36c3145dc75..c9ff5d86c35e2f8efd0eb5aec882631b0cd2fb13 100644
--- a/src/ports/SkScalerContext_win_dw.cpp
+++ b/src/ports/SkScalerContext_win_dw.cpp
@@ -34,14 +34,6 @@
 #include <dwrite.h>
 #if SK_HAS_DWRITE_1_H
 #  include <dwrite_1.h>
-#else
-#  pragma message("No dwrite_1.h is available, font metrics may be affected.")
-#endif
-
-#if SK_HAS_DWRITE_2_H
-#  include <dwrite_2.h>
-#else
-#  pragma message("No dwrite_2.h is available, pixel antialiased glyph quality may be affected.")
 #endif
 
 /* Note:
@@ -220,9 +212,11 @@
         , fGlyphCount(-1) {
 
 #if SK_HAS_DWRITE_2_H
-    fIsColorFont = fTypeface->fFactory2 &&
-                   fTypeface->fDWriteFontFace2 &&
-                   fTypeface->fDWriteFontFace2->IsColorFont();
+    fTypeface->fFactory->QueryInterface<IDWriteFactory2>(&fFactory2);
+
+    SkTScopedComPtr<IDWriteFontFace2> fontFace2;
+    fTypeface->fDWriteFontFace->QueryInterface<IDWriteFontFace2>(&fontFace2);
+    fIsColorFont = fFactory2.get() && fontFace2.get() && fontFace2->IsColorFont();
 #endif
 
     // In general, all glyphs should use CLEARTYPE_NATURAL_SYMMETRIC
@@ -330,30 +324,6 @@
         fMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
     }
 
-    // DirectWrite2 allows for grayscale hinting.
-#if SK_HAS_DWRITE_2_H
-    fAntiAliasMode = DWRITE_TEXT_ANTIALIAS_MODE_CLEARTYPE;
-#ifndef SK_IGNORE_DW_GRAY_FIX
-    if (fTypeface->fFactory2 && fTypeface->fDWriteFontFace2 &&
-        !isLCD(fRec) && !(fRec.fFlags & SkScalerContext::kGenA8FromLCD_Flag))
-    {
-        // DWRITE_TEXTURE_ALIASED_1x1 is now misnamed, it must also be used with grayscale.
-        fTextureType = DWRITE_TEXTURE_ALIASED_1x1;
-        fAntiAliasMode = DWRITE_TEXT_ANTIALIAS_MODE_GRAYSCALE;
-    }
-#endif
-#endif
-
-    // DirectWrite2 allows hinting to be disabled.
-#if SK_HAS_DWRITE_2_H
-    fGridFitMode = DWRITE_GRID_FIT_MODE_ENABLED;
-    if (fTypeface->fFactory2 && fTypeface->fDWriteFontFace2 &&
-        fRec.getHinting() == SkPaint::kNo_Hinting)
-    {
-        fGridFitMode = DWRITE_GRID_FIT_MODE_DISABLED;
-    }
-#endif
-
     if (this->isSubpixel()) {
         fTextSizeMeasure = realTextSize;
         fMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
@@ -462,31 +432,16 @@
     SkTScopedComPtr<IDWriteGlyphRunAnalysis> glyphRunAnalysis;
     {
         SkAutoExclusive l(DWriteFactoryMutex);
-        if (fTypeface->fFactory2) {
-#if SK_HAS_DWRITE_2_H
-            HRNM(fTypeface->fFactory2->CreateGlyphRunAnalysis(
-                     &run,
-                     &fXform,
-                     renderingMode,
-                     fMeasuringMode,
-                     fGridFitMode,
-                     fAntiAliasMode,
-                     0.0f, // baselineOriginX,
-                     0.0f, // baselineOriginY,
-                     &glyphRunAnalysis),
-                 "Could not create DW2 glyph run analysis.");
-#endif
-        } else {
-            HRNM(fTypeface->fFactory->CreateGlyphRunAnalysis(&run,
-                     1.0f, // pixelsPerDip,
-                     &fXform,
-                     renderingMode,
-                     fMeasuringMode,
-                     0.0f, // baselineOriginX,
-                     0.0f, // baselineOriginY,
-                     &glyphRunAnalysis),
-                "Could not create glyph run analysis.");
-        }
+        HRM(fTypeface->fFactory->CreateGlyphRunAnalysis(
+            &run,
+            1.0f, // pixelsPerDip,
+            &fXform,
+            renderingMode,
+            fMeasuringMode,
+            0.0f, // baselineOriginX,
+            0.0f, // baselineOriginY,
+            &glyphRunAnalysis),
+            "Could not create glyph run analysis.");
     }
     {
         Shared l(DWriteFactoryMutex);
@@ -543,7 +498,7 @@
     run.isSideways = FALSE;
     run.glyphOffsets = &offset;
 
-    HRESULT hr = fTypeface->fFactory2->TranslateColorGlyphRun(
+    HRESULT hr = fFactory2->TranslateColorGlyphRun(
         0, 0, &run, nullptr, fMeasuringMode, &fXform, 0, colorGlyph);
     if (hr == DWRITE_E_NOCOLOR) {
         return false;
@@ -636,6 +591,8 @@
         metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
         return;
     }
+#else
+#  pragma message("No dwrite_1.h is available, font metrics may be affected.")
 #endif
 
     AutoTDWriteTable<SkOTTableHead> head(fTypeface->fDWriteFontFace.get());
@@ -699,22 +656,6 @@
 }
 
 template<bool APPLY_PREBLEND>
-static void grayscale_to_a8(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph,
-                            const uint8_t* table8) {
-    const size_t dstRB = glyph.rowBytes();
-    const U16CPU width = glyph.fWidth;
-    uint8_t* SK_RESTRICT dst = static_cast<uint8_t*>(glyph.fImage);
-
-    for (U16CPU y = 0; y < glyph.fHeight; y++) {
-        for (U16CPU i = 0; i < width; i++) {
-            U8CPU a = *(src++);
-            dst[i] = sk_apply_lut_if<APPLY_PREBLEND>(a, table8);
-        }
-        dst = SkTAddOffset<uint8_t>(dst, dstRB);
-    }
-}
-
-template<bool APPLY_PREBLEND>
 static void rgb_to_a8(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph, const uint8_t* table8) {
     const size_t dstRB = glyph.rowBytes();
     const U16CPU width = glyph.fWidth;
@@ -727,7 +668,7 @@
             U8CPU b = *(src++);
             dst[i] = sk_apply_lut_if<APPLY_PREBLEND>((r + g + b) / 3, table8);
         }
-        dst = SkTAddOffset<uint8_t>(dst, dstRB);
+        dst = (uint8_t*)((char*)dst + dstRB);
     }
 }
 
@@ -752,7 +693,7 @@
             }
             dst[i] = SkPack888ToRGB16(r, g, b);
         }
-        dst = SkTAddOffset<uint16_t>(dst, dstRB);
+        dst = (uint16_t*)((char*)dst + dstRB);
     }
 }
 
@@ -761,7 +702,7 @@
                                            DWRITE_TEXTURE_TYPE textureType)
 {
     int sizeNeeded = glyph.fWidth * glyph.fHeight;
-    if (DWRITE_TEXTURE_CLEARTYPE_3x1 == textureType) {
+    if (DWRITE_RENDERING_MODE_ALIASED != renderingMode) {
         sizeNeeded *= 3;
     }
     if (sizeNeeded > fBits.count()) {
@@ -792,33 +733,19 @@
     run.isSideways = FALSE;
     run.glyphOffsets = &offset;
     {
+
         SkTScopedComPtr<IDWriteGlyphRunAnalysis> glyphRunAnalysis;
         {
             SkAutoExclusive l(DWriteFactoryMutex);
-            if (fTypeface->fFactory2) {
-#if SK_HAS_DWRITE_2_H
-                HRNM(fTypeface->fFactory2->CreateGlyphRunAnalysis(&run,
-                         &fXform,
-                         renderingMode,
-                         fMeasuringMode,
-                         fGridFitMode,
-                         fAntiAliasMode,
-                         0.0f, // baselineOriginX,
-                         0.0f, // baselineOriginY,
-                         &glyphRunAnalysis),
-                     "Could not create DW2 glyph run analysis.");
-#endif
-            } else {
-                HRNM(fTypeface->fFactory->CreateGlyphRunAnalysis(&run,
-                         1.0f, // pixelsPerDip,
-                         &fXform,
-                         renderingMode,
-                         fMeasuringMode,
-                         0.0f, // baselineOriginX,
-                         0.0f, // baselineOriginY,
-                         &glyphRunAnalysis),
-                     "Could not create glyph run analysis.");
-            }
+            HRNM(fTypeface->fFactory->CreateGlyphRunAnalysis(&run,
+                1.0f, // pixelsPerDip,
+                &fXform,
+                renderingMode,
+                fMeasuringMode,
+                0.0f, // baselineOriginX,
+                0.0f, // baselineOriginY,
+                &glyphRunAnalysis),
+                "Could not create glyph run analysis.");
         }
         //NOTE: this assumes that the glyph has already been measured
         //with an exact same glyph run analysis.
@@ -938,18 +865,10 @@
         bilevel_to_bw(src, glyph);
         const_cast<SkGlyph&>(glyph).fMaskFormat = SkMask::kBW_Format;
     } else if (!isLCD(fRec)) {
-        if (textureType == DWRITE_TEXTURE_ALIASED_1x1) {
-            if (fPreBlend.isApplicable()) {
-                grayscale_to_a8<true>(src, glyph, fPreBlend.fG);
-            } else {
-                grayscale_to_a8<false>(src, glyph, fPreBlend.fG);
-            }
+        if (fPreBlend.isApplicable()) {
+            rgb_to_a8<true>(src, glyph, fPreBlend.fG);
         } else {
-            if (fPreBlend.isApplicable()) {
-                rgb_to_a8<true>(src, glyph, fPreBlend.fG);
-            } else {
-                rgb_to_a8<false>(src, glyph, fPreBlend.fG);
-            }
+            rgb_to_a8<false>(src, glyph, fPreBlend.fG);
         }
     } else {
         SkASSERT(SkMask::kLCD16_Format == glyph.fMaskFormat);