arabic.c File Reference

#include "dwrite_private.h"
#include "scripts.h"

Include dependency graph for arabic.c:

Go to the source code of this file.

Classes
struct	arabic_state_table_entry

Enumerations
enum	arabic_shaping_action {   ISOL , FINA , FIN2 , FIN3 ,   MEDI , MED2 , INIT , NONE ,   NUM_FEATURES = NONE }
enum	arabic_joining_type {   JOINING_TYPE_U = 0 , JOINING_TYPE_L = 1 , JOINING_TYPE_R = 2 , JOINING_TYPE_D = 3 ,   JOINING_TYPE_C = JOINING_TYPE_D , JOINING_GROUP_ALAPH = 4 , JOINING_GROUP_DALATH_RISH = 5 , JOINING_TYPES = 6 ,   JOINING_TYPE_T = 6 }

Functions
static BOOL	feature_is_syriac (unsigned int tag)
static void	arabic_collect_features (struct scriptshaping_context *context, struct shaping_features *features)
static unsigned short	arabic_get_joining_type (UINT ch)
static void	arabic_set_shaping_action (struct scriptshaping_context *context, unsigned int idx, enum arabic_shaping_action action)
static enum arabic_shaping_action	arabic_get_shaping_action (const struct scriptshaping_context *context, unsigned int idx)
static void	arabic_setup_masks (struct scriptshaping_context *context, const struct shaping_features *features)

Variables
static const unsigned int	arabic_features []
static const struct arabic_state_table_entry	arabic_state_table [][JOINING_TYPES]
const unsigned short	arabic_shaping_table []
const struct shaper	arabic_shaper

Enumeration Type Documentation

arabic_joining_type

enum arabic_joining_type

Enumerator
JOINING_TYPE_U
JOINING_TYPE_L
JOINING_TYPE_R
JOINING_TYPE_D
JOINING_TYPE_C
JOINING_GROUP_ALAPH
JOINING_GROUP_DALATH_RISH
JOINING_TYPES
JOINING_TYPE_T

Definition at line 79 of file arabic.c.

{
    JOINING_TYPE_U = 0,
    JOINING_TYPE_L = 1,
    JOINING_TYPE_R = 2,
    JOINING_TYPE_D = 3,
    JOINING_TYPE_C = JOINING_TYPE_D,
    JOINING_GROUP_ALAPH = 4,
    JOINING_GROUP_DALATH_RISH = 5,
    JOINING_TYPES = 6,
    JOINING_TYPE_T = 6,
};

arabic_shaping_action

enum arabic_shaping_action

Enumerator
ISOL
FINA
FIN2
FIN3
MEDI
MED2
INIT
NONE
NUM_FEATURES

Definition at line 34 of file arabic.c.

{
    ISOL,
    FINA,
    FIN2,
    FIN3,
    MEDI,
    MED2,
    INIT,
    NONE,
    NUM_FEATURES = NONE,
};

Function Documentation

arabic_collect_features()

static void arabic_collect_features ( struct scriptshaping_context *  context, struct shaping_features *  features  )

static

Definition at line 53 of file arabic.c.

{
    unsigned int i;
 
    shape_enable_feature(features, DWRITE_MAKE_OPENTYPE_TAG('c','c','m','p'), 0);
    shape_enable_feature(features, DWRITE_MAKE_OPENTYPE_TAG('l','o','c','l'), 0);
    shape_start_next_stage(features, NULL);
 
    for (i = 0; i < ARRAY_SIZE(arabic_features); ++i)
    {
        unsigned int flags = context->script == Script_Arabic && !feature_is_syriac(arabic_features[i]) ?
                FEATURE_HAS_FALLBACK : 0;
        shape_add_feature_full(features, arabic_features[i], flags, 1);
        shape_start_next_stage(features, NULL);
    }
 
    shape_enable_feature(features, DWRITE_MAKE_OPENTYPE_TAG('r','l','i','g'), FEATURE_MANUAL_ZWJ | FEATURE_HAS_FALLBACK);
 
    shape_enable_feature(features, DWRITE_MAKE_OPENTYPE_TAG('r','c','l','t'), FEATURE_MANUAL_ZWJ);
    shape_enable_feature(features, DWRITE_MAKE_OPENTYPE_TAG('c','a','l','t'), FEATURE_MANUAL_ZWJ);
    shape_start_next_stage(features, NULL);
 
    shape_enable_feature(features, DWRITE_MAKE_OPENTYPE_TAG('m','s','e','t'), 0);
}

arabic_get_joining_type()

static unsigned short arabic_get_joining_type ( UINT  ch )

static

Definition at line 125 of file arabic.c.

{
    return get_table_entry_32(arabic_shaping_table, ch);
}

Referenced by arabic_setup_masks().

arabic_get_shaping_action()

static enum arabic_shaping_action arabic_get_shaping_action ( const struct scriptshaping_context *  context, unsigned int  idx  )

static

Definition at line 137 of file arabic.c.

{
    return (context->glyph_infos[idx].props >> 16) & 0xf;
}

Referenced by arabic_setup_masks().

arabic_set_shaping_action()

static void arabic_set_shaping_action ( struct scriptshaping_context *  context, unsigned int  idx, enum arabic_shaping_action  action  )

static

Definition at line 130 of file arabic.c.

{
    context->glyph_infos[idx].props &= ~(0xf << 16);
    context->glyph_infos[idx].props |= (action & 0xf) << 16;
}

Referenced by arabic_setup_masks().

arabic_setup_masks()

static void arabic_setup_masks ( struct scriptshaping_context *  context, const struct shaping_features *  features  )

static

Definition at line 143 of file arabic.c.

{
    unsigned int i, prev = ~0u, state = 0;
    unsigned int masks[NUM_FEATURES+1];
 
    for (i = 0; i < context->glyph_count; ++i)
    {
        unsigned short this_type = arabic_get_joining_type(context->glyph_infos[i].codepoint);
        const struct arabic_state_table_entry *entry;
 
        if (this_type == JOINING_TYPE_T)
        {
            arabic_set_shaping_action(context, i, NONE);
            continue;
        }
 
        entry = &arabic_state_table[state][this_type];
 
        if (entry->prev_action != NONE && prev != ~0u)
            arabic_set_shaping_action(context, prev, entry->prev_action);
 
        arabic_set_shaping_action(context, i, entry->curr_action);
 
        prev = i;
        state = entry->next_state;
    }
 
    for (i = 0; i < NUM_FEATURES; ++i)
        masks[i] = shape_get_feature_1_mask(features, arabic_features[i]);
    masks[NONE] = 0;
 
    /* Unaffected glyphs get action NONE with zero mask. */
    for (i = 0; i < context->glyph_count; ++i)
    {
        enum arabic_shaping_action action = arabic_get_shaping_action(context, i);
        if (action != NONE)
            opentype_layout_unsafe_to_break(context, i, i + 1);
        context->glyph_infos[i].mask |= masks[action];
    }
}

feature_is_syriac()

static BOOL feature_is_syriac ( unsigned int  tag )

static

Definition at line 47 of file arabic.c.

{
    return tag == arabic_features[FIN2] || tag == arabic_features[FIN3] ||
            tag == arabic_features[MED2];
}

Referenced by arabic_collect_features().

Variable Documentation

arabic_features

const unsigned int arabic_features[]

static

Initial value:

=
{
    DWRITE_MAKE_OPENTYPE_TAG('i','s','o','l'),
    DWRITE_MAKE_OPENTYPE_TAG('f','i','n','a'),
    DWRITE_MAKE_OPENTYPE_TAG('f','i','n','2'),
    DWRITE_MAKE_OPENTYPE_TAG('f','i','n','3'),
    DWRITE_MAKE_OPENTYPE_TAG('m','e','d','i'),
    DWRITE_MAKE_OPENTYPE_TAG('m','e','d','2'),
    DWRITE_MAKE_OPENTYPE_TAG('i','n','i','t'),
}

Definition at line 23 of file arabic.c.

Referenced by arabic_collect_features(), arabic_setup_masks(), and feature_is_syriac().

arabic_shaper

const struct shaper arabic_shaper

Initial value:

=
{
    .collect_features = arabic_collect_features,
    .setup_masks = arabic_setup_masks,
}

Definition at line 185 of file arabic.c.

Referenced by shape_set_shaper().

arabic_shaping_table

const unsigned short arabic_shaping_table[]

extern

Definition at line 7 of file arabic_table.c.

Referenced by arabic_get_joining_type().

arabic_state_table

const struct arabic_state_table_entry arabic_state_table[][JOINING_TYPES]

static

Initial value:

=
{
    
    
    { {NONE,NONE,0}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,6}, },
 
    
    { {NONE,NONE,0}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,FIN2,5}, {NONE,ISOL,6}, },
 
    
    { {NONE,NONE,0}, {NONE,ISOL,2}, {INIT,FINA,1}, {INIT,FINA,3}, {INIT,FINA,4}, {INIT,FINA,6}, },
 
    
    { {NONE,NONE,0}, {NONE,ISOL,2}, {MEDI,FINA,1}, {MEDI,FINA,3}, {MEDI,FINA,4}, {MEDI,FINA,6}, },
 
    
    { {NONE,NONE,0}, {NONE,ISOL,2}, {MED2,ISOL,1}, {MED2,ISOL,2}, {MED2,FIN2,5}, {MED2,ISOL,6}, },
 
    
    { {NONE,NONE,0}, {NONE,ISOL,2}, {ISOL,ISOL,1}, {ISOL,ISOL,2}, {ISOL,FIN2,5}, {ISOL,ISOL,6}, },
 
    
    { {NONE,NONE,0}, {NONE,ISOL,2}, {NONE,ISOL,1}, {NONE,ISOL,2}, {NONE,FIN3,5}, {NONE,ISOL,6}, }
}

Referenced by arabic_setup_masks().