s/this is,/that is,/

4 files changed, 11 insertions, 11 deletions

diff --git a/include/freetype/freetype.h b/include/freetype/freetype.h
index e855e6cb6..ec3fd31df 100644
--- a/include/freetype/freetype.h
+++ b/include/freetype/freetype.h
@@ -918,7 +918,7 @@ FT_BEGIN_HEADER
    *     If we have the third named instance of face~4, say, `face_index` is
    *     set to 0x00030004.
    *
-   *     Bit 31 is always zero (this is, `face_index` is always a positive
+   *     Bit 31 is always zero (that is, `face_index` is always a positive
    *     value).
    *
    *     [Since 2.9] Changing the design coordinates with
@@ -936,7 +936,7 @@ FT_BEGIN_HEADER
    *
    *     [Since 2.6.1] Bits 16-30 hold the number of named instances
    *     available for the current face if we have a GX or OpenType variation
-   *     (sub)font.  Bit 31 is always zero (this is, `style_flags` is always
+   *     (sub)font.  Bit 31 is always zero (that is, `style_flags` is always
    *     a positive value).  Note that a variation font has always at least
    *     one named instance, namely the default instance.
    *
@@ -1205,13 +1205,13 @@ FT_BEGIN_HEADER
    *     successfully; in all other cases you get an
    *     `FT_Err_Invalid_Argument` error.
    *
-   *     Note that CID-keyed fonts that are in an SFNT wrapper (this is, all
+   *     Note that CID-keyed fonts that are in an SFNT wrapper (that is, all
    *     OpenType/CFF fonts) don't have this flag set since the glyphs are
    *     accessed in the normal way (using contiguous indices); the
    *     'CID-ness' isn't visible to the application.
    *
    *   FT_FACE_FLAG_TRICKY ::
-   *     The face is 'tricky', this is, it always needs the font format's
+   *     The face is 'tricky', that is, it always needs the font format's
    *     native hinting engine to get a reasonable result.  A typical example
    *     is the old Chinese font `mingli.ttf` (but not `mingliu.ttc`) that
    *     uses TrueType bytecode instructions to move and scale all of its
@@ -2449,7 +2449,7 @@ FT_BEGIN_HEADER
    *   Each new face object created with this function also owns a default
    *   @FT_Size object, accessible as `face->size`.
    *
-   *   One @FT_Library instance can have multiple face objects, this is,
+   *   One @FT_Library instance can have multiple face objects, that is,
    *   @FT_Open_Face and its siblings can be called multiple times using the
    *   same `library` argument.
    *
@@ -2677,7 +2677,7 @@ FT_BEGIN_HEADER
    *   silently uses outlines if there is no bitmap for a given glyph index.
    *
    *   For GX and OpenType variation fonts, a bitmap strike makes sense only
-   *   if the default instance is active (this is, no glyph variation takes
+   *   if the default instance is active (that is, no glyph variation takes
    *   place); otherwise, FreeType simply ignores bitmap strikes.  The same
    *   is true for all named instances that are different from the default
    *   instance.
@@ -2974,7 +2974,7 @@ FT_BEGIN_HEADER
    *   glyph may be transformed.  See @FT_Set_Transform for the details.
    *
    *   For subsetted CID-keyed fonts, `FT_Err_Invalid_Argument` is returned
-   *   for invalid CID values (this is, for CID values that don't have a
+   *   for invalid CID values (that is, for CID values that don't have a
    *   corresponding glyph in the font).  See the discussion of the
    *   @FT_FACE_FLAG_CID_KEYED flag for more details.
    *
diff --git a/include/freetype/ftdriver.h b/include/freetype/ftdriver.h
index 59804ab1a..7af7465bc 100644
--- a/include/freetype/ftdriver.h
+++ b/include/freetype/ftdriver.h
@@ -134,7 +134,7 @@ FT_BEGIN_HEADER
    *   each being rounded to the nearest pixel edge, taking care of overshoot
    *   suppression at small sizes, stem darkening, and scaling.
    *
-   *   Hstems (this is, hint values defined in the font to help align
+   *   Hstems (that is, hint values defined in the font to help align
    *   horizontal features) that fall within a blue zone are said to be
    *   'captured' and are aligned to that zone.  Uncaptured stems are moved
    *   in one of four ways, top edge up or down, bottom edge up or down.
@@ -446,7 +446,7 @@ FT_BEGIN_HEADER
    *   at smaller sizes.
    *
    *   For the auto-hinter, stem-darkening is experimental currently and thus
-   *   switched off by default (this is, `no-stem-darkening` is set to TRUE
+   *   switched off by default (that is, `no-stem-darkening` is set to TRUE
    *   by default).  Total consistency with the CFF driver is not achieved
    *   right now because the emboldening method differs and glyphs must be
    *   scaled down on the Y-axis to keep outline points inside their
diff --git a/include/freetype/ftimage.h b/include/freetype/ftimage.h
index 738b515ed..6baa81256 100644
--- a/include/freetype/ftimage.h
+++ b/include/freetype/ftimage.h
@@ -862,7 +862,7 @@ FT_BEGIN_HEADER
    *   @FT_SpanFunc that takes the y~coordinate of the span as a parameter.
    *
    *   The anti-aliased rasterizer produces coverage values from 0 to 255,
-   *   this is, from completely transparent to completely opaque.
+   *   that is, from completely transparent to completely opaque.
    */
   typedef struct  FT_Span_
   {
diff --git a/include/freetype/ftoutln.h b/include/freetype/ftoutln.h
index 54434b25f..f9329ca40 100644
--- a/include/freetype/ftoutln.h
+++ b/include/freetype/ftoutln.h
@@ -118,7 +118,7 @@ FT_BEGIN_HEADER
    *   attachement.
    *
    *   Similarly, the function returns success for an empty outline also
-   *   (doing nothing, this is, not calling any emitter); if necessary, you
+   *   (doing nothing, that is, not calling any emitter); if necessary, you
    *   should filter this out, too.
    */
   FT_EXPORT( FT_Error )