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| author | Behdad Esfahbod <behdad@google.com> | 2013-05-29 11:36:18 +0200 |
|---|---|---|
| committer | Werner Lemberg <wl@gnu.org> | 2013-05-29 11:36:18 +0200 |
| commit | 760d342d37ec9b26420956e3421075d410571b65 (patch) | |
| tree | e1f4ba2a3761da048795faaacbdb8aa0ab63ce66 /devel | |
| parent | 713ea8e87ca56f3ac474fb85010fd5de285d4b30 (diff) | |
| download | freetype2-760d342d37ec9b26420956e3421075d410571b65.tar.gz | |
Add support for color embedded bitmaps (eg. color emoji).
A new load flag, FT_LOAD_COLOR, makes FreeType load color
embedded-bitmaps, following this draft specification
https://color-emoji.googlecode.com/git/specification/v1.html
which defines two new SFNT tables, `CBDT' and `CBLC' (named and
modeled after `EBDT' and `EBLC', respectively). The color bitmaps
are stored in the new FT_PIXEL_MODE_BGRA format to represent BGRA
pre-multiplied sRGB images. If PNG support is available, PNG color
images as defined in the same proposed specification are supported
also.
Note that color bitmaps are converted to grayscale if client didn't
ask for color.
* builds/unix/configure.raw: Search for libpng.
Add `--without-png' option.
* devel/ftoption.h, include/freetype/config/ftoption.h
(FT_CONFIG_OPTION_USE_PNG): New macro.
* include/freetype/freetype.h (FT_LOAD_COLOR): New load flag.
* include/freetype/ftimage.h (FT_Pixel_Mode): Add
`FT_PIXEL_MODE_BGRA'.
* include/freetype/tttags.h (TTAG_CBDT, TTAG_CBLC): New tags.
* src/base/ftbitmap.c (FT_Bitmap_Embolden): Updated.
(ft_gray_for_premultiplied_srgb_bgra): New function.
(FT_Bitmap_Convert): Handle FT_PIXEL_MODE_BGRA.
* src/sfnt/pngshim.c, src/sfnt/pngshim.h: New files.
* src/sfnt/sfnt.c: Include `pngshim.c'.
* src/sfnt/ttsbit.c: Include FT_BITMAP_H and `pngshim.h'
(tt_face_load_eblc): Load `CBLC'.
(tt_sbit_decoder_init): Load `CBDT'.
(tt_sbit_decoder_alloc_bitmap): Pass load flags to select between
color and grayscale bitmaps.
Set `num_grays'. This is used by `ftview' to choose the blending
algorithm.
(tt_sbit_decoder_load_byte_aligned,
tt_sbit_decoder_load_bit_aligned, tt_sbit_decoder_load_compound,
tt_sbit_decoder_load_image): Pass load flag.
s/write/pwrite/.
Don't call `tt_sbit_decoder_alloc_bitmap'.
Updated.
(tt_sbit_decoder_load_png) [FT_CONFIG_OPTION_USE_PNG]: New function.
(tt_sbit_decoder_load_bitmap): Pass load flag.
Handle new glyph formats 17, 18, and 19.
Call `tt_sbit_decoder_alloc_bitmap'.
Flatten color bitmaps if necessary.
(tt_face_load_sbit_image): Updated.
* src/sfnt/rules.mk (SFNT_DRV_SRC): Add `pngshim.c'.
* docs/CHANGES: Updated.
Diffstat (limited to 'devel')
| -rw-r--r-- | devel/ftoption.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/devel/ftoption.h b/devel/ftoption.h index 2b370e508..069601805 100644 --- a/devel/ftoption.h +++ b/devel/ftoption.h @@ -205,6 +205,20 @@ FT_BEGIN_HEADER /*************************************************************************/ /* */ + /* PNG bitmap support. */ + /* */ + /* FreeType now handles loading color bitmap glyphs in the PNG format. */ + /* This requires help from the external libpng library. Uncompressed */ + /* color bitmaps do not need any external libraries and will be */ + /* supported regardless of this configuration. */ + /* */ + /* Define this macro if you want to enable this `feature'. */ + /* */ +#define FT_CONFIG_OPTION_USE_PNG + + + /*************************************************************************/ + /* */ /* Define to disable the use of file stream functions and types, FILE, */ /* fopen() etc. Enables the use of smaller system libraries on embedded */ /* systems that have multiple system libraries, some with or without */ |