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Diffstat (limited to 'src/3rdparty/freetype/docs/CHANGES')
| -rw-r--r-- | src/3rdparty/freetype/docs/CHANGES | 188 |
1 files changed, 187 insertions, 1 deletions
diff --git a/src/3rdparty/freetype/docs/CHANGES b/src/3rdparty/freetype/docs/CHANGES index bbc31104af..ffc686b466 100644 --- a/src/3rdparty/freetype/docs/CHANGES +++ b/src/3rdparty/freetype/docs/CHANGES @@ -1,3 +1,189 @@ +CHANGES BETWEEN 2.6 and 2.6.1 + + I. IMPORTANT BUG FIXES + + - It turned out that for CFFs only the advance widths should be + taken from the `htmx' table, not the side bearings. This bug, + introduced in version 2.6.0, makes it necessary to upgrade if + you are using CFFs; otherwise, you get cropped glyphs with GUI + interfaces like GTK or Qt. + + - Accessing Type 42 fonts returned incorrect results if the glyph + order of the embedded TrueType font differs from the glyph order + of the Type 42 charstrings table. + + + II. IMPORTANT CHANGES + + - The header file layout has been changed (again), moving all + header files except `ft2build.h' into a subdirectory tree. + + Doing so reduces the possibility of header file name clashes + (e.g., FTGL's `FTGlyph.h' with FreeType's `ftglyph.h') on case + insensitive file systems like Mac OS X or Windows. + + Applications that use (a) the `freetype-config' script or + FreeType's `freetype2.pc' file for pkg-config to get the include + directory for the compiler, and (b) the documented way for + header inclusion like + + #include <ft2build.h> + #include FT_FREETYPE_H + ... + + don't need any change to the source code. + + - Simple access to named instances in GX variation fonts is now + available (in addition to the previous method via FreeType's MM + interface). In the `FT_Face' structure, bits 16-30 of the + `face_index' field hold the current named instance index for the + given face index, and bits 16-30 of `style_flags' contain the + number of instances for the given face index. `FT_Open_Face' + and friends also understand the extended bits of the face index + parameter. + + You need to enable TT_CONFIG_OPTION_GX_VAR_SUPPORT for this new + feature. Otherwise, bits 16-30 of the two fields are zero (or + are ignored). + + - Lao script support has been added to the auto-hinter. + + + III. MISCELLANEOUS + + - The auto-hinter's Arabic script support has been enhanced. + + - Superscript-like and subscript-like glyphs as used by various + phonetic alphabets like the IPA are now better supported by the + auto-hinter. + + - The TrueType bytecode interpreter now runs slightly faster. + + - Improved support for builds with cmake. + + - The function `FT_CeilFix' now always rounds towards plus + infinity. + + - The function `FT_FloorFix' now always rounds towards minus + infinity. + + - A new load flag `FT_LOAD_COMPUTE_METRICS' has been added; it + makes FreeType ignore pre-computed metrics, as needed by font + validating or font editing programs. Right now, only the + TrueType module supports it to ignore data from the `hdmx' + table. + + - Another round of bug fixes to better handle broken fonts, found + by Kostya Serebryany <kcc@google.com>. + + +====================================================================== + +CHANGES BETWEEN 2.5.5 and 2.6 + + I. IMPORTANT CHANGES + + - Behdad Esfahbod contributed code for improved thread-safety, + which results in the following model. + + * An `FT_Face' object can only be safely used from one thread at + a time. + + * An `FT_Library' object can now be used without modification + from multiple threads at the same time. + + * `FT_Face' creation and destruction with the same `FT_Library' + object can only be done from one thread at a time. + + One can use a single `FT_Library' object across threads as long + as a mutex lock is used around `FT_New_Face' and `FT_Done_Face'. + Any calls to `FT_Load_Glyph' and similar API are safe and do not + need the lock to be held as long as the same `FT_Face' is not + used from multiple threads at the same time. + + - Thai script support has been added to the auto-hinter. + + - Arabic script support has been added to the auto-hinter. + + - Following OpenType version 1.7, advance widths and side bearing + values in CFFs (wrapped in an SFNT structure) are now always + taken from the `hmtx' table. + + - Following OpenType version 1.7, the PostScript font name of a + CFF font (wrapped in an SFNT structure) is now always taken from + the `name' table. This is also true for OpenType Collections + (i.e., TTCs using CFFs subfonts instead of TTFs), where it may + have a significant difference. + + - Fonts natively hinted for ClearType are now supported, properly + handling selector index 3 of the INSTCTRL bytecode instruction. + + - Major improvements to the GX TrueType variation font handling. + + + II. MISCELLANEOUS + + - A new auto-hinter property `warping' can switch on and off the + warping code if this experimental feature is compiled in (by + defining the AF_CONFIG_OPTION_USE_WARPER configuration option; + by default this option is now enabled but warping is switched + off). + + The AF_CONFIG_OPTION_USE_WARPER option itself is an old feature, + available since 2006. Warping only works in `light' + auto-hinting mode. The idea of the code is to slightly scale + and shift a glyph along the non-hinted dimension (which is + usually the horizontal axis) so that as much of its segments are + aligned (more or less) to the grid. To find out a glyph's + optimal scaling and shifting value, various parameter + combinations are tried and scored. + + See file `ftautoh.h' for more; the demo programs `ftdiff', + `ftview', and `ftgrid' can toggle warping with key `w'. + + - Some fields in the `FTC_ImageTypeRec' structure have been + changed from signed to unsigned type, which better reflects the + actual usage. It is also an additional means to protect against + malformed input. + + This change doesn't break the ABI; however, it might cause + compiler warnings. + + - Function `FT_Bitmap_New' has been renamed to `FT_Bitmap_Init', + since this name better reflects its function. For backwards + compatibility, the old function name is still available. + + - Function `FT_Get_X11_Font_Format' has been renamed to + `FT_Get_Font_Format', since this name better reflects its + function. For backwards compatibility, the old function name is + still available. + + Additionally, the header file macro for this function has been + renamed to `FT_FONT_FORMATS_H' (the old name `FT_XFREE86_H' is + retained for backwards compatibility). + + - Various improvements to the `ftgrid' demo program. + + . It can now display GX and MM fonts while interactively + manipulating the axes (with keys F2, F3, and F4). + + . Anti-aliasing rendering modes can now be selected (with keys + F5 and F6). + + . The display of point numbers can be toggled with key `D'. + + - Various improvements to the `ftdump' demo program. + + . It now displays information on MM and GX variation axes. + + . New command line option `-u' makes it output data in utf-8 + encoding. + + - The `ftmulti' demo program can now handle up to six MM or GX + axes. + + +====================================================================== CHANGES BETWEEN 2.5.4 and 2.5.5 @@ -4159,7 +4345,7 @@ Extensions support: ------------------------------------------------------------------------ -Copyright 2000-2013 by +Copyright 2000-2015 by David Turner, Robert Wilhelm, and Werner Lemberg. This file is part of the FreeType project, and may only be used, |