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Unified Diff: third_party/freetype/include/freetype/freetype.h

Issue 1413673003: Update bundled freetype to 2.6.1 (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: DEPS for corpus Created 5 years, 1 month ago
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Index: third_party/freetype/include/freetype/freetype.h
diff --git a/third_party/freetype/include/freetype.h b/third_party/freetype/include/freetype/freetype.h
similarity index 94%
rename from third_party/freetype/include/freetype.h
rename to third_party/freetype/include/freetype/freetype.h
index efbd13ad8358e098010f6eabb9d73a2a87ee6a5e..b6247f510f030306b62a81f5ebb039354d8e68bd 100644
--- a/third_party/freetype/include/freetype.h
+++ b/third_party/freetype/include/freetype/freetype.h
@@ -4,7 +4,7 @@
/* */
/* FreeType high-level API and common types (specification only). */
/* */
-/* Copyright 1996-2014 by */
+/* Copyright 1996-2015 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@@ -394,8 +394,11 @@ FT_BEGIN_HEADER
/* It also embeds a memory manager (see @FT_Memory), as well as a */
/* scan-line converter object (see @FT_Raster). */
/* */
- /* In multi-threaded applications, make sure that the same FT_Library */
- /* object or any of its children doesn't get accessed in parallel. */
+ /* In multi-threaded applications it is easiest to use one */
+ /* `FT_Library' object per thread. In case this is too cumbersome, */
+ /* a single `FT_Library' object across threads is possible also */
+ /* (since FreeType version 2.5.6), as long as a mutex lock is used */
+ /* around @FT_New_Face and @FT_Done_Face. */
/* */
/* <Note> */
/* Library objects are normally created by @FT_Init_FreeType, and */
@@ -477,6 +480,14 @@ FT_BEGIN_HEADER
/* */
/* Use @FT_Done_Face to destroy it (along with its slot and sizes). */
/* */
+ /* An `FT_Face' object can only be safely used from one thread at a */
+ /* time. Similarly, creation and destruction of `FT_Face' with the */
+ /* same @FT_Library object can only be done from one thread at a */
+ /* time. On the other hand, functions like @FT_Load_Glyph and its */
+ /* siblings are thread-safe and do not need the lock to be held as */
+ /* long as the same `FT_Face' object is not used from multiple */
+ /* threads at the same time. */
+ /* */
/* <Also> */
/* See @FT_FaceRec for the publicly accessible fields of a given face */
/* object. */
@@ -631,9 +642,13 @@ FT_BEGIN_HEADER
/* */
/* FT_ENCODING_MS_SYMBOL :: */
/* Corresponds to the Microsoft Symbol encoding, used to encode */
- /* mathematical symbols in the 32..255 character code range. For */
- /* more information, see */
- /* `http://www.kostis.net/charsets/symbol.htm'. */
+ /* mathematical symbols and wingdings. For more information, see */
+ /* `http://www.microsoft.com/typography/otspec/recom.htm', */
+ /* `http://www.kostis.net/charsets/symbol.htm', and */
+ /* `http://www.kostis.net/charsets/wingding.htm'. */
+ /* */
+ /* This encoding uses character codes from the PUA (Private Unicode */
+ /* Area) in the range U+F020-U+F0FF. */
/* */
/* FT_ENCODING_SJIS :: */
/* Corresponds to Japanese SJIS encoding. More info at */
@@ -651,7 +666,7 @@ FT_BEGIN_HEADER
/* FT_ENCODING_WANSUNG :: */
/* Corresponds to the Korean encoding system known as Wansung. */
/* For more information see */
- /* `http://msdn.microsoft.com/en-US/goglobal/cc305154'. */
+ /* `https://msdn.microsoft.com/en-US/goglobal/cc305154'. */
/* */
/* FT_ENCODING_JOHAB :: */
/* The Korean standard character set (KS~C 5601-1992), which */
@@ -861,17 +876,36 @@ FT_BEGIN_HEADER
/* font formats can have multiple faces in */
/* a font file. */
/* */
- /* face_index :: The index of the face in the font file. It */
- /* is set to~0 if there is only one face in */
+ /* face_index :: This field holds two different values. */
+ /* Bits 0-15 are the index of the face in the */
+ /* font file (starting with value~0). They */
+ /* are set to~0 if there is only one face in */
/* the font file. */
/* */
+ /* Bits 16-30 are relevant to GX variation */
+ /* fonts only, holding the named instance */
+ /* index for the current face index (starting */
+ /* with value~1; value~0 indicates font access */
+ /* without GX variation data). For non-GX */
+ /* fonts, bits 16-30 are ignored. 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 value). */
+ /* */
/* face_flags :: A set of bit flags that give important */
/* information about the face; see */
/* @FT_FACE_FLAG_XXX for the details. */
/* */
- /* style_flags :: A set of bit flags indicating the style of */
- /* the face; see @FT_STYLE_FLAG_XXX for the */
- /* details. */
+ /* style_flags :: The lower 16~bits contain a set of bit */
+ /* flags indicating the style of the face; see */
+ /* @FT_STYLE_FLAG_XXX for the details. Bits */
+ /* 16-30 hold the number of named instances */
+ /* available for the current face if we have a */
+ /* GX variation (sub)font. Bit 31 is always */
+ /* zero (this is, `style_flags' is always a */
+ /* positive value). */
/* */
/* num_glyphs :: The number of glyphs in the face. If the */
/* face is scalable and has sbits (see */
@@ -893,6 +927,11 @@ FT_BEGIN_HEADER
/* Can be NULL (e.g., in fonts embedded in a */
/* PDF file). */
/* */
+ /* In case the font doesn't provide a specific */
+ /* family name entry, FreeType tries to */
+ /* synthesize one, deriving it from other name */
+ /* entries. */
+ /* */
/* style_name :: The face's style name. This is an ASCII */
/* string, usually in English, that describes */
/* the typeface's style (like `Italic', */
@@ -1140,7 +1179,7 @@ FT_BEGIN_HEADER
/* TrueType bytecode instructions to move and scale all of its */
/* subglyphs. */
/* */
- /* It is not possible to autohint such fonts using */
+ /* It is not possible to auto-hint such fonts using */
/* @FT_LOAD_FORCE_AUTOHINT; it will also ignore */
/* @FT_LOAD_NO_HINTING. You have to set both @FT_LOAD_NO_HINTING */
/* and @FT_LOAD_NO_AUTOHINT to really disable hinting; however, you */
@@ -1372,7 +1411,7 @@ FT_BEGIN_HEADER
/* FT_STYLE_FLAG_XXX */
/* */
/* <Description> */
- /* A list of bit-flags used to indicate the style of a given face. */
+ /* A list of bit flags used to indicate the style of a given face. */
/* These are used in the `style_flags' field of @FT_FaceRec. */
/* */
/* <Values> */
@@ -1649,11 +1688,11 @@ FT_BEGIN_HEADER
/* needs to know about the image format. */
/* */
/* lsb_delta :: The difference between hinted and unhinted */
- /* left side bearing while autohinting is */
+ /* left side bearing while auto-hinting is */
/* active. Zero otherwise. */
/* */
/* rsb_delta :: The difference between hinted and unhinted */
- /* right side bearing while autohinting is */
+ /* right side bearing while auto-hinting is */
/* active. Zero otherwise. */
/* */
/* <Note> */
@@ -1676,7 +1715,7 @@ FT_BEGIN_HEADER
/* `slot->format' is also changed to @FT_GLYPH_FORMAT_BITMAP. */
/* */
/* <Note> */
- /* Here a small pseudo code fragment that shows how to use */
+ /* Here is a small pseudo code fragment that shows how to use */
/* `lsb_delta' and `rsb_delta': */
/* */
/* { */
@@ -1769,8 +1808,8 @@ FT_BEGIN_HEADER
/* use @FT_New_Library instead, followed by a call to */
/* @FT_Add_Default_Modules (or a series of calls to @FT_Add_Module). */
/* */
- /* For multi-threading applications each thread should have its own */
- /* FT_Library object. */
+ /* See the documentation of @FT_Library and @FT_Face for */
+ /* multi-threading issues. */
/* */
/* If you need reference-counting (cf. @FT_Reference_Library), use */
/* @FT_New_Library and @FT_Done_Library. */
@@ -1804,7 +1843,7 @@ FT_BEGIN_HEADER
/* FT_OPEN_XXX */
/* */
/* <Description> */
- /* A list of bit-field constants used within the `flags' field of the */
+ /* A list of bit field constants used within the `flags' field of the */
/* @FT_Open_Args structure. */
/* */
/* <Values> */
@@ -1951,13 +1990,12 @@ FT_BEGIN_HEADER
/* <Input> */
/* pathname :: A path to the font file. */
/* */
- /* face_index :: The index of the face within the font. The first */
- /* face has index~0. */
+ /* face_index :: See @FT_Open_Face for a detailed description of this */
+ /* parameter. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. If `face_index' is */
/* greater than or equal to zero, it must be non-NULL. */
- /* See @FT_Open_Face for more details. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
@@ -1990,13 +2028,12 @@ FT_BEGIN_HEADER
/* */
/* file_size :: The size of the memory chunk used by the font data. */
/* */
- /* face_index :: The index of the face within the font. The first */
- /* face has index~0. */
+ /* face_index :: See @FT_Open_Face for a detailed description of this */
+ /* parameter. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. If `face_index' is */
/* greater than or equal to zero, it must be non-NULL. */
- /* See @FT_Open_Face for more details. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
@@ -2028,13 +2065,43 @@ FT_BEGIN_HEADER
/* args :: A pointer to an `FT_Open_Args' structure that must */
/* be filled by the caller. */
/* */
- /* face_index :: The index of the face within the font. The first */
- /* face has index~0. */
+ /* face_index :: This field holds two different values. Bits 0-15 */
+ /* are the index of the face in the font file (starting */
+ /* with value~0). Set it to~0 if there is only one */
+ /* face in the font file. */
+ /* */
+ /* Bits 16-30 are relevant to GX variation fonts only, */
+ /* specifying the named instance index for the current */
+ /* face index (starting with value~1; value~0 makes */
+ /* FreeType ignore named instances). For non-GX fonts, */
+ /* bits 16-30 are ignored. Assuming that you want to */
+ /* access the third named instance in face~4, */
+ /* `face_index' should be set to 0x00030004. If you */
+ /* want to access face~4 without GX variation handling, */
+ /* simply set `face_index' to value~4. */
+ /* */
+ /* FT_Open_Face and its siblings can be used to quickly */
+ /* check whether the font format of a given font */
+ /* resource is supported by FreeType. In general, if */
+ /* the `face_index' argument is negative, the */
+ /* function's return value is~0 if the font format is */
+ /* recognized, or non-zero otherwise. The function */
+ /* allocates a more or less empty face handle in */
+ /* `*aface' (if `aface' isn't NULL); the only two */
+ /* useful fields in this special case are */
+ /* `face->num_faces' and `face->style_flags'. For any */
+ /* negative value of `face_index', `face->num_faces' */
+ /* gives the number of faces within the font file. For */
+ /* the negative value `-(N+1)' (with `N' a 16-bit */
+ /* value), bits 16-30 in `face->style_flags' give the */
+ /* number of named instances in face `N' if we have a */
+ /* GX variation font (or zero otherwise). After */
+ /* examination, the returned @FT_Face structure should */
+ /* be deallocated with a call to @FT_Done_Face. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. If `face_index' is */
/* greater than or equal to zero, it must be non-NULL. */
- /* See note below. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
@@ -2044,16 +2111,6 @@ FT_BEGIN_HEADER
/* slot for the face object that can be accessed directly through */
/* `face->glyph'. */
/* */
- /* FT_Open_Face can be used to quickly check whether the font */
- /* format of a given font resource is supported by FreeType. If the */
- /* `face_index' field is negative, the function's return value is~0 */
- /* if the font format is recognized, or non-zero otherwise; */
- /* the function returns a more or less empty face handle in `*aface' */
- /* (if `aface' isn't NULL). The only useful field in this special */
- /* case is `face->num_faces' that gives the number of faces within */
- /* the font file. After examination, the returned @FT_Face structure */
- /* should be deallocated with a call to @FT_Done_Face. */
- /* */
/* Each new face object created with this function also owns a */
/* default @FT_Size object, accessible as `face->size'. */
/* */
@@ -2064,6 +2121,74 @@ FT_BEGIN_HEADER
/* See the discussion of reference counters in the description of */
/* @FT_Reference_Face. */
/* */
+ /* To loop over all faces, use code similar to the following snippet */
+ /* (omitting the error handling). */
+ /* */
+ /* { */
+ /* ... */
+ /* FT_Face face; */
+ /* FT_Long i, num_faces; */
+ /* */
+ /* */
+ /* error = FT_Open_Face( library, args, -1, &face ); */
+ /* if ( error ) { ... } */
+ /* */
+ /* num_faces = face->num_faces; */
+ /* FT_Done_Face( face ); */
+ /* */
+ /* for ( i = 0; i < num_faces; i++ ) */
+ /* { */
+ /* ... */
+ /* error = FT_Open_Face( library, args, i, &face ); */
+ /* ... */
+ /* FT_Done_Face( face ); */
+ /* ... */
+ /* } */
+ /* } */
+ /* */
+ /* To loop over all valid values for `face_index', use something */
+ /* similar to the following snippet, again without error handling. */
+ /* The code accesses all faces immediately (thus only a single call */
+ /* of `FT_Open_Face' within the do-loop), with and without named */
+ /* instances. */
+ /* */
+ /* { */
+ /* ... */
+ /* FT_Face face; */
+ /* */
+ /* FT_Long num_faces = 0; */
+ /* FT_Long num_instances = 0; */
+ /* */
+ /* FT_Long face_idx = 0; */
+ /* FT_Long instance_idx = 0; */
+ /* */
+ /* */
+ /* do */
+ /* { */
+ /* FT_Long id = ( instance_idx << 16 ) + face_idx; */
+ /* */
+ /* */
+ /* error = FT_Open_Face( library, args, id, &face ); */
+ /* if ( error ) { ... } */
+ /* */
+ /* num_faces = face->num_faces; */
+ /* num_instances = face->style_flags >> 16; */
+ /* */
+ /* ... */
+ /* */
+ /* FT_Done_Face( face ); */
+ /* */
+ /* if ( instance_idx < num_instances ) */
+ /* instance_idx++; */
+ /* else */
+ /* { */
+ /* face_idx++; */
+ /* instance_idx = 0; */
+ /* } */
+ /* */
+ /* } while ( face_idx < num_faces ) */
+ /* } */
+ /* */
FT_EXPORT( FT_Error )
FT_Open_Face( FT_Library library,
const FT_Open_Args* args,
@@ -2501,7 +2626,7 @@ FT_BEGIN_HEADER
* FT_LOAD_XXX
*
* @description:
- * A list of bit-field constants used with @FT_Load_Glyph to indicate
+ * A list of bit field constants used with @FT_Load_Glyph to indicate
* what kind of operations to perform during glyph loading.
*
* @values:
@@ -2618,6 +2743,16 @@ FT_BEGIN_HEADER
* bitmaps transparently. Those bitmaps will be in the
* @FT_PIXEL_MODE_GRAY format.
*
+ * FT_LOAD_COMPUTE_METRICS ::
+ * This flag sets computing glyph metrics without the use of bundled
+ * metrics tables (for example, the `hdmx' table in TrueType fonts).
+ * Well-behaving fonts have optimized bundled metrics and these should
+ * be used. This flag is mainly used by font validating or font
+ * editing applications, which need to ignore, verify, or edit those
+ * tables.
+ *
+ * Currently, this flag is only implemented for TrueType fonts.
+ *
* FT_LOAD_CROP_BITMAP ::
* Ignored. Deprecated.
*
@@ -2663,6 +2798,7 @@ FT_BEGIN_HEADER
#define FT_LOAD_NO_AUTOHINT ( 1L << 15 )
/* Bits 16..19 are used by `FT_LOAD_TARGET_' */
#define FT_LOAD_COLOR ( 1L << 20 )
+#define FT_LOAD_COMPUTE_METRICS ( 1L << 21 )
/* */
@@ -2907,15 +3043,22 @@ FT_BEGIN_HEADER
/* @FT_Get_Kerning. */
/* */
/* <Values> */
- /* FT_KERNING_DEFAULT :: Return scaled and grid-fitted kerning */
- /* distances (value is~0). */
+ /* FT_KERNING_DEFAULT :: Return grid-fitted kerning distances in */
+ /* pixels (value is~0). Whether they are */
+ /* scaled depends on @FT_LOAD_NO_SCALE. */
/* */
- /* FT_KERNING_UNFITTED :: Return scaled but un-grid-fitted kerning */
- /* distances. */
+ /* FT_KERNING_UNFITTED :: Return un-grid-fitted kerning distances in */
+ /* 26.6 fractional pixels. Whether they are */
+ /* scaled depends on @FT_LOAD_NO_SCALE. */
/* */
/* FT_KERNING_UNSCALED :: Return the kerning vector in original font */
/* units. */
/* */
+ /* <Note> */
+ /* FT_KERNING_DEFAULT returns full pixel values; it also makes */
+ /* FreeType heuristically scale down kerning distances at small ppem */
+ /* values so that they don't become too big. */
+ /* */
typedef enum FT_Kerning_Mode_
{
FT_KERNING_DEFAULT = 0,
@@ -2952,9 +3095,10 @@ FT_BEGIN_HEADER
/* kerning vector. */
/* */
/* <Output> */
- /* akerning :: The kerning vector. This is either in font units */
- /* or in pixels (26.6 format) for scalable formats, */
- /* and in pixels for fixed-sizes formats. */
+ /* akerning :: The kerning vector. This is either in font units, */
+ /* fractional pixels (26.6 format), or pixels for */
+ /* scalable formats, and in pixels for fixed-sizes */
+ /* formats. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
@@ -3239,6 +3383,13 @@ FT_BEGIN_HEADER
/* } */
/* } */
/* */
+ /* Be aware that character codes can have values up to 0xFFFFFFFF; */
+ /* this might happen for non-Unicode or malformed cmaps. However, */
+ /* even with regular Unicode encoding, so-called `last resort fonts' */
+ /* (using SFNT cmap format 13, see function @FT_Get_CMap_Format) */
+ /* normally have entries for all Unicode characters up to 0x1FFFFF, */
+ /* which can cause *a lot* of iterations. */
+ /* */
/* Note that `*agindex' is set to~0 if the charmap is empty. The */
/* result itself can be~0 in two cases: if the charmap is empty or */
/* if the value~0 is the first valid character code. */
@@ -3398,8 +3549,9 @@ FT_BEGIN_HEADER
/* @FT_Get_FSType_Flags; they inform client applications of embedding */
/* and subsetting restrictions associated with a font. */
/* */
- /* See http://www.adobe.com/devnet/acrobat/pdfs/FontPolicies.pdf for */
- /* more details. */
+ /* See */
+ /* http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FontPolicies.pdf */
+ /* for more details. */
/* */
/* <Values> */
/* FT_FSTYPE_INSTALLABLE_EMBEDDING :: */
@@ -3433,6 +3585,9 @@ FT_BEGIN_HEADER
/* bitmaps available in the font, then the font is unembeddable. */
/* */
/* <Note> */
+ /* The flags are ORed together, thus more than a single value can be */
+ /* returned. */
+ /* */
/* While the fsType flags can indicate that a font may be embedded, a */
/* license with the font vendor may be separately required to use the */
/* font in this way. */
@@ -3818,7 +3973,8 @@ FT_BEGIN_HEADER
/* a :: The number to be rounded. */
/* */
/* <Return> */
- /* The result of `(a + 0x8000) & -0x10000'. */
+ /* `a' rounded to nearest 16.16 fixed integer, halfway cases away */
+ /* from zero. */
/* */
FT_EXPORT( FT_Fixed )
FT_RoundFix( FT_Fixed a );
@@ -3837,7 +3993,7 @@ FT_BEGIN_HEADER
/* a :: The number for which the ceiling function is to be computed. */
/* */
/* <Return> */
- /* The result of `(a + 0x10000 - 1) & -0x10000'. */
+ /* `a' rounded towards plus infinity. */
/* */
FT_EXPORT( FT_Fixed )
FT_CeilFix( FT_Fixed a );
@@ -3856,7 +4012,7 @@ FT_BEGIN_HEADER
/* a :: The number for which the floor function is to be computed. */
/* */
/* <Return> */
- /* The result of `a & -0x10000'. */
+ /* `a' rounded towards minus infinity. */
/* */
FT_EXPORT( FT_Fixed )
FT_FloorFix( FT_Fixed a );
@@ -3936,8 +4092,8 @@ FT_BEGIN_HEADER
*
*/
#define FREETYPE_MAJOR 2
-#define FREETYPE_MINOR 5
-#define FREETYPE_PATCH 4
+#define FREETYPE_MINOR 6
+#define FREETYPE_PATCH 1
/*************************************************************************/
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