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Code Issues 4 Releases Wiki Activity

[base] Introduce `FT_New_Glyph'. 

This function facilitates access to full capabilities of FreeType
rendering engine for custom glyphs. This can be quite useful for
consistent rendering of mathematical and chemical formulas, e.g.

  https://bugs.chromium.org/p/chromium/issues/detail?id=757078

* include/freetype/ftglyph.h, src/base/ftglyph.c (FT_New_Glyph): New
function.
This commit is contained in:
Alexei Podtelezhnikov 2018-06-17 22:33:29 -04:00
parent e13599a036
commit b1a3c59f8d
3 changed files with 74 additions and 23 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2018-06-17 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] Introduce `FT_New_Glyph'.
This function facilitates access to full capabilities of FreeType
rendering engine for custom glyphs. This can be quite useful for
consistent rendering of mathematical and chemical formulas, e.g.
https://bugs.chromium.org/p/chromium/issues/detail?id=757078
* include/freetype/ftglyph.h, src/base/ftglyph.c (FT_New_Glyph): New
function.
2018-06-17 Armin Hasitzka <prince.cherusker@gmail.com>
[bdf] Fix underflow of an unsigned value.

29
include/freetype/ftglyph.h
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@ -223,6 +223,35 @@ FT_BEGIN_HEADER
} FT_OutlineGlyphRec;
/**************************************************************************
*
* @function:
* FT_New_Glyph
*
* @description:
* A function used to create a new empty glyph image. Note that
* the created @FT_Glyph object must be released with @FT_Done_Glyph.
*
* @input:
* library :: A handle to the FreeType library object.
*
* format :: The format of the glyph's image.
*
* @output:
* aglyph :: A handle to the glyph object.
*
* @return:
* FreeType error code. 0~means success.
*
* @since
* 2.10
*/
FT_EXPORT( FT_Error )
FT_New_Glyph( FT_Library library,
FT_Glyph_Format format,
FT_Glyph *aglyph );
/**************************************************************************
*
* @function:

55
src/base/ftglyph.c
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@ -358,37 +358,28 @@
/* documentation is in ftglyph.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_Glyph( FT_GlyphSlot slot,
FT_Glyph *aglyph )
FT_EXPORT( FT_Error )
FT_New_Glyph( FT_Library library,
FT_Glyph_Format format,
FT_Glyph *aglyph )
{
FT_Library library;
FT_Error error;
FT_Glyph glyph;
const FT_Glyph_Class* clazz = NULL;
if ( !slot )
return FT_THROW( Invalid_Slot_Handle );
library = slot->library;
if ( !aglyph )
if ( !library || !aglyph )
return FT_THROW( Invalid_Argument );
/* if it is a bitmap, that's easy :-) */
if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
if ( format == FT_GLYPH_FORMAT_BITMAP )
clazz = &ft_bitmap_glyph_class;
/* if it is an outline */
else if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
else if ( format == FT_GLYPH_FORMAT_OUTLINE )
clazz = &ft_outline_glyph_class;
else
{
/* try to find a renderer that supports the glyph image format */
FT_Renderer render = FT_Lookup_Renderer( library, slot->format, 0 );
FT_Renderer render = FT_Lookup_Renderer( library, format, 0 );
if ( render )
@ -396,13 +387,31 @@
}
if ( !clazz )
{
error = FT_THROW( Invalid_Glyph_Format );
goto Exit;
}
return FT_THROW( Invalid_Glyph_Format );
/* create FT_Glyph object */
error = ft_new_glyph( library, clazz, &glyph );
return ft_new_glyph( library, clazz, aglyph );
}
/* documentation is in ftglyph.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_Glyph( FT_GlyphSlot slot,
FT_Glyph *aglyph )
{
FT_Error error;
FT_Glyph glyph;
if ( !slot )
return FT_THROW( Invalid_Slot_Handle );
if ( !aglyph )
return FT_THROW( Invalid_Argument );
/* create FT_Glyph object */
error = FT_New_Glyph( slot->library, slot->format, &glyph );
if ( error )
goto Exit;
@ -426,7 +435,7 @@
glyph->advance.y = slot->advance.y * 1024;
/* now import the image from the glyph slot */
error = clazz->glyph_init( glyph, slot );
error = glyph->clazz->glyph_init( glyph, slot );
Exit2:
/* if an error occurred, destroy the glyph */