diff options
Diffstat (limited to 'fitz/base_context.c')
| -rw-r--r-- | fitz/base_context.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/fitz/base_context.c b/fitz/base_context.c index ea67e0be..8189efb2 100644 --- a/fitz/base_context.c +++ b/fitz/base_context.c @@ -1,5 +1,47 @@ #include "fitz-internal.h" +struct fz_id_context_s +{ + int refs; + int id; +}; + +static void +fz_drop_id_context(fz_context *ctx) +{ + int refs; + fz_id_context *id = ctx->id; + + if (id == NULL) + return; + fz_lock(ctx, FZ_LOCK_ALLOC); + refs = --id->refs; + fz_unlock(ctx, FZ_LOCK_ALLOC); + if (refs == 0) + fz_free(ctx, id); +} + +static void +fz_new_id_context(fz_context *ctx) +{ + ctx->id = fz_malloc_struct(ctx, fz_id_context); + ctx->id->refs = 1; + ctx->id->id = 0; +} + +static fz_id_context * +fz_keep_id_context(fz_context *ctx) +{ + fz_id_context *id = ctx->id; + + if (id == NULL) + return NULL; + fz_lock(ctx, FZ_LOCK_ALLOC); + ++id->refs; + fz_unlock(ctx, FZ_LOCK_ALLOC); + return id; +} + void fz_free_context(fz_context *ctx) { @@ -11,6 +53,7 @@ fz_free_context(fz_context *ctx) fz_drop_store_context(ctx); fz_free_aa_context(ctx); fz_drop_font_context(ctx); + fz_drop_id_context(ctx); if (ctx->warn) { @@ -96,6 +139,7 @@ fz_new_context(fz_alloc_context *alloc, fz_locks_context *locks, unsigned int ma fz_new_store_context(ctx, max_store); fz_new_glyph_cache_context(ctx); fz_new_font_context(ctx); + fz_new_id_context(ctx); } fz_catch(ctx) { @@ -138,6 +182,24 @@ fz_clone_context_internal(fz_context *ctx) new_ctx->glyph_cache = fz_keep_glyph_cache(new_ctx); new_ctx->font = ctx->font; new_ctx->font = fz_keep_font_context(new_ctx); + new_ctx->id = ctx->id; + new_ctx->id = fz_keep_id_context(new_ctx); return new_ctx; } + +int +fz_gen_id(fz_context *ctx) +{ + int id; + fz_lock(ctx, FZ_LOCK_ALLOC); + /* We'll never wrap around in normal use, but if we *do*, then avoid + * 0. */ + do + { + id = ++ctx->id->id; + } + while (id == 0); + fz_unlock(ctx, FZ_LOCK_ALLOC); + return id; +} |