Rotate emoji with FreeType.

src/ports/SkFontHost_FreeType_common.cpp

Index: src/ports/SkFontHost_FreeType_common.cpp
diff --git a/src/ports/SkFontHost_FreeType_common.cpp b/src/ports/SkFontHost_FreeType_common.cpp
index 245ded1283572362da007c6837caf4e9d9486e0a..96a7134fd838f04239ef4d3b0abf523c5da20c77 100644
--- a/src/ports/SkFontHost_FreeType_common.cpp
+++ b/src/ports/SkFontHost_FreeType_common.cpp
@@ -334,7 +334,11 @@ inline SkColorType SkColorType_for_SkMaskFormat(SkMask::Format format) {
     }
 }
 
-void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGlyph& glyph) {
+void SkScalerContext_FreeType_Base::generateGlyphImage(
+    FT_Face face,
+    const SkGlyph& glyph,
+    const SkMatrix& bitmapTransform)
+{
     const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag);
     const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag);
 
@@ -411,11 +415,7 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGly
             }
 
             // If no scaling needed, directly copy glyph bitmap.
-            if (glyph.fWidth == face->glyph->bitmap.width &&
-                glyph.fHeight == face->glyph->bitmap.rows &&
-                glyph.fTop == -face->glyph->bitmap_top &&
-                glyph.fLeft == face->glyph->bitmap_left)
-            {
+            if (bitmapTransform.isIdentity()) {
                 SkMask dstMask;
                 glyph.toMask(&dstMask);
                 copyFTBitmap(face->glyph->bitmap, dstMask);
@@ -426,6 +426,7 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGly
 
             // Copy the FT_Bitmap into an SkBitmap (either A8 or ARGB)
             SkBitmap unscaledBitmap;
+            // TODO: mark this as sRGB when the blits will be sRGB.
             unscaledBitmap.allocPixels(SkImageInfo::Make(face->glyph->bitmap.width,
                                                          face->glyph->bitmap.rows,
                                                          SkColorType_for_FTPixelMode(pixel_mode),
@@ -447,6 +448,7 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGly
                 bitmapRowBytes = glyph.rowBytes();
             }
             SkBitmap dstBitmap;
+            // TODO: mark this as sRGB when the blits will be sRGB.
             dstBitmap.setInfo(SkImageInfo::Make(glyph.fWidth, glyph.fHeight,
                                                 SkColorType_for_SkMaskFormat(maskFormat),
                                                 kPremul_SkAlphaType),
@@ -459,9 +461,15 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGly
 
             // Scale unscaledBitmap into dstBitmap.
             SkCanvas canvas(dstBitmap);
+#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
+            canvas.clear(0x33FF0000);
+#else
             canvas.clear(SK_ColorTRANSPARENT);
-            canvas.scale(SkIntToScalar(glyph.fWidth) / SkIntToScalar(face->glyph->bitmap.width),
-                         SkIntToScalar(glyph.fHeight) / SkIntToScalar(face->glyph->bitmap.rows));
+#endif
+            canvas.translate(-glyph.fLeft, -glyph.fTop);
+            canvas.concat(bitmapTransform);
+            canvas.translate(face->glyph->bitmap_left, -face->glyph->bitmap_top);
+
             SkPaint paint;
             paint.setFilterQuality(kMedium_SkFilterQuality);
             canvas.drawBitmap(unscaledBitmap, 0, 0, &paint);