Pango Reference Manual | ||||
---|---|---|---|---|
FreeType Fonts and RenderingFreeType Fonts and Rendering — Functions for shape engines to manipulate FreeType fonts |
PangoFT2FontMap; #define PANGO_RENDER_TYPE_FT2 PangoFontMap* pango_ft2_font_map_new (void); void pango_ft2_font_map_set_resolution (PangoFT2FontMap *fontmap, double dpi_x, double dpi_y); PangoContext* pango_ft2_font_map_create_context (PangoFT2FontMap *fontmap); void (*PangoFT2SubstituteFunc) (FcPattern *pattern, gpointer data); void pango_ft2_font_map_set_default_substitute (PangoFT2FontMap *fontmap, PangoFT2SubstituteFunc func, gpointer data, GDestroyNotify notify); void pango_ft2_font_map_substitute_changed (PangoFT2FontMap *fontmap); PangoContext* pango_ft2_get_context (double dpi_x, double dpi_y); void pango_ft2_render (FT_Bitmap *bitmap, PangoFont *font, PangoGlyphString *glyphs, gint x, gint y); void pango_ft2_render_transformed (FT_Bitmap *bitmap, const PangoMatrix *matrix, PangoFont *font, PangoGlyphString *glyphs, int x, int y); void pango_ft2_render_layout_line (FT_Bitmap *bitmap, PangoLayoutLine *line, int x, int y); void pango_ft2_render_layout_line_subpixel (FT_Bitmap *bitmap, PangoLayoutLine *line, int x, int y); void pango_ft2_render_layout (FT_Bitmap *bitmap, PangoLayout *layout, int x, int y); void pango_ft2_render_layout_subpixel (FT_Bitmap *bitmap, PangoLayout *layout, int x, int y); PangoGlyph pango_ft2_get_unknown_glyph (PangoFont *font); int pango_ft2_font_get_kerning (PangoFont *font, PangoGlyph left, PangoGlyph right); FT_Face pango_ft2_font_get_face (PangoFont *font); PangoCoverage* pango_ft2_font_get_coverage (PangoFont *font, PangoLanguage *language); PangoFontMap* pango_ft2_font_map_for_display (void); void pango_ft2_shutdown_display (void);
The macros and functions in this section are used to access fonts and render text to bitmaps using the FreeType 2 library.
typedef struct _PangoFT2FontMap PangoFT2FontMap;
The PangoFT2FontMap is the PangoFontMap implementation for FreeType fonts.
#define PANGO_RENDER_TYPE_FT2 "PangoRenderFT2"
PANGO_RENDER_TYPE_FT2
is deprecated and should not be used in newly-written code.
A string constant that was used to identify shape engines that work
with the FreeType backend. See PANGO_RENDER_TYPE_FC
for the replacement.
PangoFontMap* pango_ft2_font_map_new (void);
Create a new PangoFT2FontMap object; a fontmap is used
to cache information about available fonts, and holds
certain global parameters such as the resolution and
the default substitute function (see
pango_ft2_font_map_set_default_substitute()
).
Returns : | the newly created fontmap object. Unref
with g_object_unref() when you are finished with it.
|
Since 1.2
void pango_ft2_font_map_set_resolution (PangoFT2FontMap *fontmap, double dpi_x, double dpi_y);
Sets the horizontal and vertical resolutions for the fontmap.
fontmap : |
a PangoFT2Fontmap |
dpi_x : |
dots per inch in the X direction |
dpi_y : |
dots per inch in the Y direction |
Since 1.2
PangoContext* pango_ft2_font_map_create_context (PangoFT2FontMap *fontmap);
Create a PangoContext for the given fontmap.
fontmap : |
a PangoFT2Fontmap |
Returns : | the newly created context; free with g_object_unref() .
|
Since 1.2
void (*PangoFT2SubstituteFunc) (FcPattern *pattern, gpointer data);
Function type for doing final config tweaking on prepared FcPatterns.
pattern : |
the FcPattern to tweak. |
data : |
user data. |
void pango_ft2_font_map_set_default_substitute (PangoFT2FontMap *fontmap, PangoFT2SubstituteFunc func, gpointer data, GDestroyNotify notify);
Sets a function that will be called to do final configuration substitution on a FcPattern before it is used to load the font. This function can be used to do things like set hinting and antialiasing options.
fontmap : |
a PangoFT2FontMap |
func : |
function to call to to do final config tweaking on FcPattern objects. |
data : |
data to pass to func
|
notify : |
function to call when data is no longer used.
|
Since 1.2
void pango_ft2_font_map_substitute_changed (PangoFT2FontMap *fontmap);
Call this function any time the results of the
default substitution function set with
pango_ft2_font_map_set_default_substitute()
change.
That is, if your substitution function will return different
results for the same input pattern, you must call this function.
fontmap : |
a PangoFT2Fontmap |
Since 1.2
PangoContext* pango_ft2_get_context (double dpi_x, double dpi_y);
pango_ft2_get_context
is deprecated and should not be used in newly-written code.
Retrieves a PangoContext for the default PangoFT2 fontmap
(see pango_ft2_fontmap_get_for_display()
) and sets the resolution
for the default fontmap to dpi_x
by dpi_y
.
Use of this function is deprecated; see pango_ft2_fontmap_create_context()
instead.
dpi_x : |
the horizontal DPI of the target device |
dpi_y : |
the vertical DPI of the target device |
Returns : | the new PangoContext |
void pango_ft2_render (FT_Bitmap *bitmap, PangoFont *font, PangoGlyphString *glyphs, gint x, gint y);
Renders a PangoGlyphString onto a FreeType2 bitmap.
bitmap : |
the FreeType2 bitmap onto which to draw the string |
font : |
the font in which to draw the string |
glyphs : |
the glyph string to draw |
x : |
the x position of the start of the string (in pixels) |
y : |
the y position of the baseline (in pixels) |
void pango_ft2_render_transformed (FT_Bitmap *bitmap, const PangoMatrix *matrix, PangoFont *font, PangoGlyphString *glyphs, int x, int y);
Renders a PangoGlyphString onto a FreeType2 bitmap, possibly
transforming the layed-out coordinates through a transformation
matrix. Note that the transformation matrix for font
is not
changed, so to produce correct rendering results, the font
must have been loaded using a PangoContext with an identical
transformation matrix to that passed in to this function.
bitmap : |
the FreeType2 bitmap onto which to draw the string |
matrix : |
a PangoMatrix, or NULL to use an identity transformation
|
font : |
the font in which to draw the string |
glyphs : |
the glyph string to draw |
x : |
the x position of the start of the string (in Pango units in user space coordinates) |
y : |
the y position of the baseline (in Pango units in user space coordinates) |
Since 1.6
void pango_ft2_render_layout_line (FT_Bitmap *bitmap, PangoLayoutLine *line, int x, int y);
Render a PangoLayoutLine onto a FreeType2 bitmap
bitmap : |
a FT_Bitmap to render the line onto |
line : |
a PangoLayoutLine |
x : |
the x position of start of string (in pixels) |
y : |
the y position of baseline (in pixels) |
void pango_ft2_render_layout_line_subpixel (FT_Bitmap *bitmap, PangoLayoutLine *line, int x, int y);
Render a PangoLayoutLine onto a FreeType2 bitmap, with he location specified in fixed-point Pango units rather than pixels. (Using this will avoid extra inaccuracies from rounding to integer pixels multiple times, even if the final glyph positions are integers.)
bitmap : |
a FT_Bitmap to render the line onto |
line : |
a PangoLayoutLine |
x : |
the x position of start of string (in Pango units) |
y : |
the y position of baseline (in Pango units) |
Since 1.6
void pango_ft2_render_layout (FT_Bitmap *bitmap, PangoLayout *layout, int x, int y);
Render a PangoLayout onto a FreeType2 bitmap
bitmap : |
a FT_Bitmap to render the layout onto |
layout : |
a PangoLayout |
x : |
the X position of the left of the layout (in pixels) |
y : |
the Y position of the top of the layout (in pixels) |
void pango_ft2_render_layout_subpixel (FT_Bitmap *bitmap, PangoLayout *layout, int x, int y);
Render a PangoLayout onto a FreeType2 bitmap, with he location specified in fixed-point Pango units rather than pixels. (Using this will avoid extra inaccuracies from rounding to integer pixels multiple times, even if the final glyph positions are integers.)
bitmap : |
a FT_Bitmap to render the layout onto |
layout : |
a PangoLayout |
x : |
the X position of the left of the layout (in Pango units) |
y : |
the Y position of the top of the layout (in Pango units) |
Since 1.6
PangoGlyph pango_ft2_get_unknown_glyph (PangoFont *font);
pango_ft2_get_unknown_glyph
is deprecated and should not be used in newly-written code.
Return the index of a glyph suitable for drawing unknown characters with
font
, or PANGO_GLYPH_EMPTY
if no suitable glyph found.
If you want to draw an unknown-box for a character that is not covered
by the font,
use PANGO_GET_UNKNOWN_GLYPH()
instead.
font : |
a PangoFont |
Returns : | a glyph index into font , or PANGO_GLYPH_EMPTY
|
int pango_ft2_font_get_kerning (PangoFont *font, PangoGlyph left, PangoGlyph right);
pango_ft2_font_get_kerning
is deprecated and should not be used in newly-written code.
Retrieves kerning information for a combination of two glyphs.
Use pango_fc_font_kern_glyphs()
instead.
font : |
a PangoFont |
left : |
the left PangoGlyph |
right : |
the right PangoGlyph |
Returns : | The amount of kerning (in Pango units) to apply for the given combination of glyphs. |
FT_Face pango_ft2_font_get_face (PangoFont *font);
pango_ft2_font_get_face
is deprecated and should not be used in newly-written code.
Returns the native FreeType2 FT_Face structure used for this PangoFont. This may be useful if you want to use FreeType2 functions directly.
Use pango_fc_font_lock_face()
instead; when you are done with a
face from pango_fc_font_lock_face()
you must call
pango_fc_font_unlock_face()
.
font : |
a PangoFont |
Returns : | a pointer to a FT_Face structure, with the size set correctly |
PangoCoverage* pango_ft2_font_get_coverage (PangoFont *font, PangoLanguage *language);
pango_ft2_font_get_coverage
is deprecated and should not be used in newly-written code.
Gets the PangoCoverage for a PangoFT2Font. Use pango_font_get_coverage()
instead.
font : |
a PangoFT2Font. |
language : |
a language tag. |
Returns : | a PangoCoverage. |
PangoFontMap* pango_ft2_font_map_for_display (void);
pango_ft2_font_map_for_display
is deprecated and should not be used in newly-written code.
Returns a PangoFT2FontMap. This font map is cached and should
not be freed. If the font map is no longer needed, it can
be released with pango_ft2_shutdown_display()
. Use of the
global PangoFT2 fontmap is deprecated; use pango_ft2_font_map_new()
instead.
Returns : | a PangoFT2FontMap. |
void pango_ft2_shutdown_display (void);
pango_ft2_shutdown_display
is deprecated and should not be used in newly-written code.
Free the global fontmap. (See pango_ft2_font_map_for_display()
)
Use of the global PangoFT2 fontmap is deprecated.