[Git][freetype/freetype][master] * src/base/ftsynth.c (FT_GlyphSlot_Slant): New API with custom slant.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType

Commits:

• bb59c3c9
  by Liu Kunpeng(柳鲲鹏) at 2022-10-16T22:10:19-04:00

  * src/base/ftsynth.c (FT_GlyphSlot_Slant): New API with custom slant.
  * include/freetype/ftsynth.h (FT_GlyphSlot_Slant): Declare it.
  

2 changed files:

• include/freetype/ftsynth.h
• src/base/ftsynth.c

Changes:

include/freetype/ftsynth.h

---

...	...	@@ -68,10 +68,15 @@ FT_BEGIN_HEADER
68	68	FT_EXPORT( void )
69	69	FT_GlyphSlot_Embolden( FT_GlyphSlot slot );
70	70
71		- /* Slant an outline glyph to the right by about 12 degrees. */
	71	+ /* Slant an outline glyph to the right by about 12 degrees. */
72	72	FT_EXPORT( void )
73	73	FT_GlyphSlot_Oblique( FT_GlyphSlot slot );
74	74
	75	+ /* Slant an outline glyph by a given sine of an angle. */
	76	+ FT_EXPORT( void )
	77	+ FT_GlyphSlot_Slant( FT_GlyphSlot slot,
	78	+ FT_Fixed slant );
	79	+
75	80	/* */
76	81
77	82

src/base/ftsynth.c

---

...	...	@@ -45,6 +45,16 @@
45	45
46	46	FT_EXPORT_DEF( void )
47	47	FT_GlyphSlot_Oblique( FT_GlyphSlot slot )
	48	+ {
	49	+ FT_GlyphSlot_Slant( slot, 0x0366A );
	50	+ }
	51	+
	52	+
	53	+ /* documentation is in ftsynth.h */
	54	+
	55	+ FT_EXPORT_DEF( void )
	56	+ FT_GlyphSlot_Slant( FT_GlyphSlot slot,
	57	+ FT_Fixed slant )
48	58	{
49	59	FT_Matrix transform;
50	60	FT_Outline* outline;
...	...	@@ -61,13 +71,11 @@
61	71
62	72	/* we don't touch the advance width */
63	73
64		- /* For italic, simply apply a shear transform, with an angle */
65		- /* of about 12 degrees. */
66		-
	74	+ /* For italic, simply apply a shear transform */
67	75	transform.xx = 0x10000L;
68	76	transform.yx = 0x00000L;
69	77
70		- transform.xy = 0x0366AL;
	78	+ transform.xy = slant;
71	79	transform.yy = 0x10000L;
72	80
73	81	FT_Outline_Transform( outline, &transform );

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