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#include "mupdf/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)
{
if (!ctx)
return;
/* Other finalisation calls go here (in reverse order) */
fz_drop_glyph_cache_context(ctx);
fz_drop_store_context(ctx);
fz_free_aa_context(ctx);
fz_drop_colorspace_context(ctx);
fz_drop_font_context(ctx);
fz_drop_id_context(ctx);
if (ctx->warn)
{
fz_flush_warnings(ctx);
fz_free(ctx, ctx->warn);
}
if (ctx->error)
{
assert(ctx->error->top == -1);
fz_free(ctx, ctx->error);
}
/* Free the context itself */
ctx->alloc->free(ctx->alloc->user, ctx);
}
/* Allocate new context structure, and initialise allocator, and sections
* that aren't shared between contexts.
*/
static fz_context *
new_context_phase1(fz_alloc_context *alloc, fz_locks_context *locks)
{
fz_context *ctx;
ctx = alloc->malloc(alloc->user, sizeof(fz_context));
if (!ctx)
return NULL;
memset(ctx, 0, sizeof *ctx);
ctx->alloc = alloc;
ctx->locks = locks;
ctx->glyph_cache = NULL;
ctx->error = fz_malloc_no_throw(ctx, sizeof(fz_error_context));
if (!ctx->error)
goto cleanup;
ctx->error->top = -1;
ctx->error->message[0] = 0;
ctx->warn = fz_malloc_no_throw(ctx, sizeof(fz_warn_context));
if (!ctx->warn)
goto cleanup;
ctx->warn->message[0] = 0;
ctx->warn->count = 0;
/* New initialisation calls for context entries go here */
fz_try(ctx)
{
fz_new_aa_context(ctx);
}
fz_catch(ctx)
{
goto cleanup;
}
return ctx;
cleanup:
fprintf(stderr, "cannot create context (phase 1)\n");
fz_free_context(ctx);
return NULL;
}
fz_context *
fz_new_context(fz_alloc_context *alloc, fz_locks_context *locks, unsigned int max_store)
{
fz_context *ctx;
if (!alloc)
alloc = &fz_alloc_default;
if (!locks)
locks = &fz_locks_default;
ctx = new_context_phase1(alloc, locks);
if (!ctx)
return NULL;
/* Now initialise sections that are shared */
fz_try(ctx)
{
fz_new_store_context(ctx, max_store);
fz_new_glyph_cache_context(ctx);
fz_new_colorspace_context(ctx);
fz_new_font_context(ctx);
fz_new_id_context(ctx);
}
fz_catch(ctx)
{
fprintf(stderr, "cannot create context (phase 2)\n");
fz_free_context(ctx);
return NULL;
}
return ctx;
}
fz_context *
fz_clone_context(fz_context *ctx)
{
/* We cannot safely clone the context without having locking/
* unlocking functions. */
if (ctx == NULL || ctx->locks == &fz_locks_default)
return NULL;
return fz_clone_context_internal(ctx);
}
fz_context *
fz_clone_context_internal(fz_context *ctx)
{
fz_context *new_ctx;
if (ctx == NULL || ctx->alloc == NULL)
return NULL;
new_ctx = new_context_phase1(ctx->alloc, ctx->locks);
if (!new_ctx)
return NULL;
/* Inherit AA defaults from old context. */
fz_copy_aa_context(new_ctx, ctx);
/* Keep thread lock checking happy by copying pointers first and locking under new context */
new_ctx->store = ctx->store;
new_ctx->store = fz_keep_store_context(new_ctx);
new_ctx->glyph_cache = ctx->glyph_cache;
new_ctx->glyph_cache = fz_keep_glyph_cache(new_ctx);
new_ctx->colorspace = ctx->colorspace;
new_ctx->colorspace = fz_keep_colorspace_context(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;
}
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