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/*
* Some additional glue functions for using Harfbuzz with
* custom allocators.
*/
#include "mupdf/fitz.h"
#include "hb.h"
/* Potentially we can write different versions
* of get_context and set_context for different
* threading systems.
*
* This simple version relies on harfbuzz never
* trying to make 2 allocations at once on
* different threads. The only way that can happen
* is when one of those other threads is someone
* outside MuPDF calling harfbuzz while MuPDF
* is running.
*
* If this is actually a problem, then we can
* reimplement set_context/get_context using
* Thread Local Storage.
*/
static fz_context *hb_secret = NULL;
static void set_context(fz_context *ctx)
{
hb_secret = ctx;
}
static fz_context *get_context()
{
return hb_secret;
}
void hb_lock(fz_context *ctx)
{
fz_lock(ctx, FZ_LOCK_FREETYPE);
set_context(ctx);
}
void hb_unlock(fz_context *ctx)
{
set_context(NULL);
fz_unlock(ctx, FZ_LOCK_FREETYPE);
}
void *hb_malloc(size_t size)
{
fz_context *ctx = get_context();
/* Should never happen, but possibly someone else
* is calling our version of the library. */
if (ctx == NULL)
return malloc(size);
return fz_malloc_no_throw(ctx, (unsigned int)size);
}
void *hb_calloc(size_t n, size_t size)
{
fz_context *ctx = get_context();
/* Should never happen, but possibly someone else
* is calling our version of the library. */
if (ctx == NULL)
return calloc(n, size);
return fz_calloc_no_throw(ctx, (unsigned int)n, (unsigned int)size);
}
void *hb_realloc(void *ptr, size_t size)
{
fz_context *ctx = get_context();
/* Should never happen, but possibly someone else
* is calling our version of the library. */
if (ctx == NULL)
return realloc(ptr, size);
return fz_resize_array_no_throw(ctx, ptr, (unsigned int)1, (unsigned int)size);
}
void hb_free(void *ptr)
{
fz_context *ctx = get_context();
/* Should never happen, but possibly someone else
* is calling our version of the library. */
if (ctx == NULL)
free(ptr);
else
fz_free(ctx, ptr);
}
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