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[docs] A bit more buffers documentation

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This commit is contained in:
Khaled Hosny 2015-12-30 15:05:50 +04:00
parent 8ab797c5b8
commit fb192c263e
3 changed files with 60 additions and 5 deletions
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2
docs/harfbuzz-sections.txt
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@ -48,6 +48,8 @@ hb_buffer_set_language
hb_buffer_get_language
hb_buffer_set_flags
hb_buffer_get_flags
hb_buffer_set_cluster_level
hb_buffer_get_cluster_level
hb_buffer_set_length
hb_buffer_get_length
hb_buffer_set_segment_properties

7
src/hb-buffer.cc
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@ -1111,9 +1111,9 @@ hb_buffer_get_segment_properties (hb_buffer_t *buffer,
/**
* hb_buffer_set_flags:
* @buffer: an #hb_buffer_t.
* @flags:
* @flags: the buffer flags to set.
*
*
* Sets @buffer flags to @flags. See #hb_buffer_flags_t.
*
* Since: 0.9.7
**/
@ -1131,9 +1131,10 @@ hb_buffer_set_flags (hb_buffer_t *buffer,
* hb_buffer_get_flags:
* @buffer: an #hb_buffer_t.
*
*
* See hb_buffer_set_flags().
*
* Return value:
* The @buffer flags.
*
* Since: 0.9.7
**/

56
src/hb-buffer.h
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@ -40,7 +40,28 @@
HB_BEGIN_DECLS
/**
* hb_glyph_info_t:
* @codepoint: either a Unicode code point (before shaping) or a glyph index
* (after shaping).
* @mask:
* @cluster: the index of the character in the original text that corresponds
* to this #hb_glyph_info_t, or whatever the client passes to
* hb_buffer_add(). More than one #hb_glyph_info_t can have the same
* @cluster value, if they resulted from the same character (e.g. one
* to many glyph substitution), and when more than one character gets
* merged in the same glyph (e.g. many to one glyph substitution) the
* #hb_glyph_info_t will have cluster value corresponding to the
* first of them. By default some characters are merged into the same
* cluster (e.g. combining marks have the same cluster as their
* bases) even if they are separate glyphs,
* hb_buffer_set_cluster_level() allow selecting more fine-grained
* cluster handling.
*
* The #hb_glyph_info_t is the structure that holds informations about the
* glyphs and their relation to input text.
*
*/
typedef struct hb_glyph_info_t {
hb_codepoint_t codepoint;
hb_mask_t mask;
@ -51,6 +72,22 @@ typedef struct hb_glyph_info_t {
hb_var_int_t var2;
} hb_glyph_info_t;
/**
* hb_glyph_position_t:
* @x_advance: how much the line advances after drawing this glyph when setting
* text in horizontal direction.
* @y_advance: how much the line advances after drawing this glyph when setting
* text in vertical direction.
* @x_offset: how much the glyph moves on the X-axis before drawing it, this
* should not affect how much the line advances.
* @y_offset: how much the glyph moves on the Y-axis before drawing it, this
* should not affect how much the line advances.
*
* The #hb_glyph_position_t is the structure that holds the positions of the
* glyph in both horizontal and vertical directions. All positions in
* #hb_glyph_position_t are relative to the current point.
*
*/
typedef struct hb_glyph_position_t {
hb_position_t x_advance;
hb_position_t y_advance;
@ -176,7 +213,22 @@ HB_EXTERN void
hb_buffer_guess_segment_properties (hb_buffer_t *buffer);
/*
/**
* hb_buffer_flags_t:
* @HB_BUFFER_FLAG_DEFAULT: the default buffer flag.
* @HB_BUFFER_FLAG_BOT: flag indicating that special handling of the beginning
* of text can be applied to this buffer. Should usually
* be set unless you are passing to the buffer only part
* of the text without the full context.
* @HB_BUFFER_FLAG_EOT: flag indicating that special handling of the end of text
* can be applied to this buffer, similar to
* @HB_BUFFER_FLAG_EOT.
* @HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES:
* flag indication that character with Default Ignorable
* Unicode property should use the corresponding glyph
* from the font, instead of replacing them with the space
* glyph and zeroing the advance width.
*
* Since: 0.9.20
*/
typedef enum { /*< flags >*/