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[TrueType] Add comment block describing why we only use int16_t

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This commit is contained in:
Behdad Esfahbod 2006-08-08 13:13:18 -04:00
parent 23f3888618
commit 6ff531c182
1 changed files with 19 additions and 8 deletions
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27
src/cairo-truetype-subset-private.h
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@ -39,6 +39,17 @@
#include "cairoint.h"
/* The structs defined here should strictly follow the TrueType
* specification and not be padded. We use only 16-bit integer
* in their definition to guarantee that. The fields of type
* "FIXED" in the TT spec are broken into two *_1 and *_2 16-bit
* parts, and 64-bit members are broken into four.
*
* The test truetype-tables in the test suite makes sure that
* these tables have the right size. Please update that test
* if you add new tables/structs that should be packed.
*/
#define MAKE_TT_TAG(a, b, c, d) (a<<24 | b<<16 | c<<8 | d)
#define TT_TAG_cmap MAKE_TT_TAG('c','m','a','p')
#define TT_TAG_cvt MAKE_TT_TAG('c','v','t',' ')
@ -54,10 +65,10 @@
/* All tt_* structs are big-endian */
typedef struct _tt_head {
int16_t version_1; /* FIXED */
int16_t version_2; /* FIXED */
int16_t revision_1; /* FIXED */
int16_t revision_2; /* FIXED */
int16_t version_1;
int16_t version_2;
int16_t revision_1;
int16_t revision_2;
uint16_t checksum_1;
uint16_t checksum_2;
uint16_t magic_1;
@ -84,8 +95,8 @@ typedef struct _tt_head {
} tt_head_t;
typedef struct _tt_hhea {
int16_t version_1; /* FIXED */
int16_t version_2; /* FIXED */
int16_t version_1;
int16_t version_2;
int16_t ascender; /* FWORD */
int16_t descender; /* FWORD */
int16_t line_gap; /* FWORD */
@ -101,8 +112,8 @@ typedef struct _tt_hhea {
} tt_hhea_t;
typedef struct _tt_maxp {
int16_t version_1; /* FIXED */
int16_t version_2; /* FIXED */
int16_t version_1;
int16_t version_2;
uint16_t num_glyphs;
uint16_t max_points;
uint16_t max_contours;