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[OTLayout] Change hb_ot_layout_get_params() API

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And add implementation for StylisticSet UINameID.  No API yet.
This commit is contained in:
Behdad Esfahbod 2012-12-11 14:17:01 -05:00
parent 5e7e52ddf2
commit 875a5cbc9c
4 changed files with 115 additions and 15 deletions
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85
src/hb-ot-layout-common-private.hh
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@ -248,6 +248,8 @@ struct Script
typedef RecordListOf<Script> ScriptList;
/* http://www.microsoft.com/typography/otspec/features_pt.htm#size */
struct FeatureParamsSize
{
inline bool sanitize (hb_sanitize_context_t *c) {
@ -255,15 +257,89 @@ struct FeatureParamsSize
return TRACE_RETURN (c->check_struct (this));
}
USHORT params[5];
USHORT designSize; /* Represents the design size in 720/inch
* units (decipoints). The design size entry
* must be non-zero. When there is a design
* size but no recommended size range, the
* rest of the array will consist of zeros. */
USHORT subfamilyID; /* Has no independent meaning, but serves
* as an identifier that associates fonts
* in a subfamily. All fonts which share a
* Preferred or Font Family name and which
* differ only by size range shall have the
* same subfamily value, and no fonts which
* differ in weight or style shall have the
* same subfamily value. If this value is
* zero, the remaining fields in the array
* will be ignored. */
USHORT subfamilyNameID;/* If the preceding value is non-zero, this
* value must be set in the range 256 - 32767
* (inclusive). It records the value of a
* field in the name table, which must
* contain English-language strings encoded
* in Windows Unicode and Macintosh Roman,
* and may contain additional strings
* localized to other scripts and languages.
* Each of these strings is the name an
* application should use, in combination
* with the family name, to represent the
* subfamily in a menu. Applications will
* choose the appropriate version based on
* their selection criteria. */
USHORT rangeStart; /* Large end of the recommended usage range
* (inclusive), stored in 720/inch units
* (decipoints). */
USHORT rangeEnd; /* Small end of the recommended usage range
(exclusive), stored in 720/inch units
* (decipoints). */
public:
DEFINE_SIZE_STATIC (10);
};
/* http://www.microsoft.com/typography/otspec/features_pt.htm#ssxx */
struct FeatureParamsStylisticSet
{
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
/* Right now minorVersion is at zero. Which means, any table supports
* the uiNameID field. */
return TRACE_RETURN (c->check_struct (this));
}
USHORT minorVersion; /* (set to 0): This corresponds to a “minor”
* version number. Additional data may be
* added to the end of this Feature Parameters
* table in the future. */
USHORT uiNameID; /* The 'name' table name ID that specifies a
* string (or strings, for multiple languages)
* for a user-interface label for this
* feature. The values of uiLabelNameId and
* sampleTextNameId are expected to be in the
* font-specific name ID range (256-32767),
* though that is not a requirement in this
* Feature Parameters specification. The
* user-interface label for the feature can
* be provided in multiple languages. An
* English string should be included as a
* fallback. The string should be kept to a
* minimal length to fit comfortably with
* different application interfaces. */
public:
DEFINE_SIZE_STATIC (4);
};
struct FeatureParams
{
/* Note: currently the only feature with params is 'size', so we hardcode
* the length of the table to that of the FeatureParamsSize. */
/* Note:
*
* FeatureParams structures unfortunately don't have a generic length argument,
* so their length depends on the feature name / requested use. We don't have
* that information at sanitize time. As such, we sanitize for the longest
* subtable possible. This may nuke a possibly valid subtable if it's unfortunate
* enough to happen at the very end of the GSUB/GPOS table. But that's very
* unlikely (I hope!).
*/
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
@ -271,7 +347,8 @@ struct FeatureParams
}
union {
FeatureParamsSize size;
FeatureParamsSize size;
FeatureParamsStylisticSet stylisticSet;
} u;
DEFINE_SIZE_STATIC (10);
};

28
src/hb-ot-layout.cc
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@ -640,8 +640,12 @@ hb_ot_layout_position_finish (hb_font_t *font, hb_buffer_t *buffer, hb_bool_t ze
}
hb_bool_t
hb_ot_layout_get_size_params (hb_face_t *face,
uint16_t *data /* OUT, 5 items */)
hb_ot_layout_get_size_params (hb_face_t *face,
unsigned int *design_size, /* OUT. May be NULL */
unsigned int *subfamily_id, /* OUT. May be NULL */
unsigned int *subfamily_name_id, /* OUT. May be NULL */
unsigned int *range_start, /* OUT. May be NULL */
unsigned int *range_end /* OUT. May be NULL */)
{
const OT::GPOS &gpos = _get_gpos (face);
@ -651,17 +655,27 @@ hb_ot_layout_get_size_params (hb_face_t *face,
if (HB_TAG ('s','i','z','e') == gpos.get_feature_tag (i))
{
const OT::Feature &f = gpos.get_feature (i);
const OT::FeatureParams &params = f.get_feature_params ();
const OT::FeatureParamsSize &params = f.get_feature_params ().u.size;
for (unsigned int i = 0; i < 5; i++)
data[i] = params.u.size.params[i];
#define PARAM(a, A) if (a) *a = params.A
PARAM (design_size, designSize);
PARAM (subfamily_id, subfamilyID);
PARAM (subfamily_name_id, subfamilyNameID);
PARAM (range_start, rangeStart);
PARAM (range_end, rangeEnd);
#undef PARAM
return true;
}
}
for (unsigned int i = 0; i < 5; i++)
data[i] = 0;
#define PARAM(a, A) if (a) *a = 0
PARAM (design_size, designSize);
PARAM (subfamily_id, subfamilyID);
PARAM (subfamily_name_id, subfamilyNameID);
PARAM (range_start, rangeStart);
PARAM (range_end, rangeEnd);
#undef PARAM
return false;
}

8
src/hb-ot-layout.h
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@ -280,8 +280,12 @@ Xhb_ot_layout_lookup_position (hb_font_t *font,
/* Optical 'size' feature info. Returns true if found.
* http://www.microsoft.com/typography/otspec/features_pt.htm#size */
hb_bool_t
hb_ot_layout_get_size_params (hb_face_t *face,
uint16_t *data /* OUT, 5 items */);
hb_ot_layout_get_size_params (hb_face_t *face,
unsigned int *design_size, /* OUT. May be NULL */
unsigned int *subfamily_id, /* OUT. May be NULL */
unsigned int *subfamily_name_id, /* OUT. May be NULL */
unsigned int *range_start, /* OUT. May be NULL */
unsigned int *range_end /* OUT. May be NULL */);
HB_END_DECLS

9
src/test-size-params.cc
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@ -84,8 +84,13 @@ main (int argc, char **argv)
hb_blob_destroy (blob);
blob = NULL;
uint16_t params[5];
if (!hb_ot_layout_get_size_params (face, params))
unsigned int params[5];
if (!hb_ot_layout_get_size_params (face,
params,
params+1,
params+2,
params+3,
params+4))
return 1;
for (unsigned int i = 0; i < 5; i++) {