diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-wasm-api.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-wasm-api.hh | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-wasm-api.hh b/gfx/harfbuzz/src/hb-wasm-api.hh new file mode 100644 index 0000000000..4ead01c1f7 --- /dev/null +++ b/gfx/harfbuzz/src/hb-wasm-api.hh @@ -0,0 +1,117 @@ +/* + * Copyright © 2023 Behdad Esfahbod + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + */ + +#ifndef HB_WASM_API_HH +#define HB_WASM_API_HH + +#include "hb.hh" + +#include <wasm_export.h> + +#define HB_WASM_BEGIN_DECLS namespace hb { namespace wasm { +#define HB_WASM_END_DECLS }} + +#define HB_WASM_API(ret_t, name) HB_INTERNAL ret_t name +#define HB_WASM_API_COMPOUND(ret_t, name) HB_INTERNAL void name + +#define HB_WASM_EXEC_ENV wasm_exec_env_t exec_env, +#define HB_WASM_EXEC_ENV_COMPOUND wasm_exec_env_t exec_env, ptr_t() retptr, + +#define ptr_t(type_t) uint32_t +#define ptr_d(type_t, name) uint32_t name##ptr + +#include "hb-wasm-api.h" + +#undef HB_WASM_BEGIN_DECLS +#undef HB_WASM_END_DECLS + + +enum { + hb_wasm_ref_type_none, + hb_wasm_ref_type_face, + hb_wasm_ref_type_font, + hb_wasm_ref_type_buffer, +}; + +HB_INTERNAL extern hb_user_data_key_t _hb_wasm_ref_type_key; + +#define nullref 0 + +#define HB_REF2OBJ(obj) \ + hb_##obj##_t *obj = nullptr; \ + HB_STMT_START { \ + (void) wasm_externref_ref2obj (obj##ptr, (void **) &obj); \ + /* Check object type. */ \ + /* This works because all our objects have the same hb_object_t layout. */ \ + if (unlikely (hb_##obj##_get_user_data (obj, &_hb_wasm_ref_type_key) != \ + (void *) hb_wasm_ref_type_##obj)) \ + obj = hb_##obj##_get_empty (); \ + } HB_STMT_END + +#define HB_OBJ2REF(obj) \ + uint32_t obj##ref = nullref; \ + HB_STMT_START { \ + hb_##obj##_set_user_data (obj, &_hb_wasm_ref_type_key, \ + (void *) hb_wasm_ref_type_##obj, \ + nullptr, false); \ + (void) wasm_externref_obj2ref (module_inst, obj, &obj##ref); \ + } HB_STMT_END + +#define HB_RETURN_STRUCT(type, name) \ + type *_name_ptr = nullptr; \ + { \ + if (likely (wasm_runtime_validate_app_addr (module_inst, \ + retptr, sizeof (type)))) \ + { \ + _name_ptr = (type *) wasm_runtime_addr_app_to_native (module_inst, retptr); \ + if (unlikely (!_name_ptr)) \ + return; \ + } \ + } \ + type &name = *_name_ptr + +#define HB_PTR_PARAM(type, name) \ + type *name = nullptr; \ + HB_STMT_START { \ + if (likely (wasm_runtime_validate_app_addr (module_inst, \ + name##ptr, sizeof (type)))) \ + name = (type *) wasm_runtime_addr_app_to_native (module_inst, name##ptr); \ + } HB_STMT_END + +#define HB_ARRAY_PARAM(type, name, length) \ + type *name = nullptr; \ + HB_STMT_START { \ + if (likely (!hb_unsigned_mul_overflows (length, sizeof (type)) && \ + wasm_runtime_validate_app_addr (module_inst, \ + name##ptr, length * sizeof (type)))) \ + name = (type *) wasm_runtime_addr_app_to_native (module_inst, name##ptr); \ + } HB_STMT_END + +#define HB_ARRAY_APP2NATIVE(type, name, length) \ + ((type *) (!hb_unsigned_mul_overflows (length, sizeof (type)) && \ + validate_app_addr (name, (length) * sizeof (type)) ? \ + addr_app_to_native (name) : nullptr)) + + +#endif /* HB_WASM_API_HH */ |