harfbuzz/src/hb-wasm-shape.cc

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/*
* Copyright © 2011 Google, Inc.
*
* 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.
*
* Google Author(s): Behdad Esfahbod
*/
#define HB_DEBUG_WASM 1
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#include "hb-shaper-impl.hh"
#ifdef HAVE_WASM
#include <wasm_export.h>
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/*
* shaper face data
*/
#define HB_WASM_TAG_WASM HB_TAG('W','a','s','m')
struct hb_wasm_face_data_t {
hb_blob_t *wasm_blob;
wasm_module_t wasm_module;
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};
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extern "C" {
static void debugprint(wasm_exec_env_t exec_env, char *the_string, uint8_t len) {
printf("%*s", len, the_string);
}
}
static bool
init_wasm ()
{
static bool initialized;
if (initialized)
return true;
RuntimeInitArgs init_args;
memset (&init_args, 0, sizeof (RuntimeInitArgs));
// Define an array of NativeSymbol for the APIs to be exported.
// Note: the array must be static defined since runtime
// will keep it after registration
// For the function signature specifications, goto the link:
// https://github.com/bytecodealliance/wasm-micro-runtime/blob/main/doc/export_native_api.md
static NativeSymbol native_symbols[] = {
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{
"debugprint",
(void *)debugprint,
"($i)",
NULL
}
};
init_args.mem_alloc_type = Alloc_With_Allocator;
init_args.mem_alloc_option.allocator.malloc_func = (void *) hb_malloc;
init_args.mem_alloc_option.allocator.realloc_func = (void *) hb_realloc;
init_args.mem_alloc_option.allocator.free_func = (void *) hb_free;
init_args.mem_alloc_type = Alloc_With_System_Allocator;
// Native symbols need below registration phase
init_args.n_native_symbols = sizeof(native_symbols) / sizeof(NativeSymbol);
init_args.native_module_name = "env";
init_args.native_symbols = native_symbols;
if (!wasm_runtime_full_init (&init_args))
{
DEBUG_MSG (WASM, nullptr, "Init runtime environment failed.");
return false;
}
initialized = true;
return true;
}
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hb_wasm_face_data_t *
_hb_wasm_shaper_face_data_create (hb_face_t *face)
{
hb_wasm_face_data_t *data = nullptr;
hb_blob_t *wasm_blob = nullptr;
wasm_module_t wasm_module = nullptr;
wasm_blob = hb_face_reference_table (face, HB_WASM_TAG_WASM);
unsigned length = hb_blob_get_length (wasm_blob);
if (!length)
goto fail;
if (!init_wasm ())
goto fail;
wasm_module = wasm_runtime_load ((uint8_t *) hb_blob_get_data_writable (wasm_blob, nullptr),
length, nullptr, 0);
if (!wasm_module)
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{
DEBUG_MSG (WASM, nullptr, "Load wasm module failed.");
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goto fail;
}
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data = (hb_wasm_face_data_t *) hb_calloc (1, sizeof (hb_wasm_face_data_t));
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if (unlikely (!data))
goto fail;
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data->wasm_blob = wasm_blob;
data->wasm_module = wasm_module;
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return data;
fail:
if (wasm_module)
wasm_runtime_unload (wasm_module);
hb_blob_destroy (wasm_blob);
hb_free (data);
return nullptr;
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}
void
_hb_wasm_shaper_face_data_destroy (hb_wasm_face_data_t *data)
{
wasm_runtime_unload (data->wasm_module);
hb_blob_destroy (data->wasm_blob);
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hb_free (data);
}
/*
* shaper font data
*/
struct hb_wasm_font_data_t {};
hb_wasm_font_data_t *
_hb_wasm_shaper_font_data_create (hb_font_t *font HB_UNUSED)
{
return (hb_wasm_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_wasm_shaper_font_data_destroy (hb_wasm_font_data_t *data HB_UNUSED)
{
}
/*
* shaper
*/
hb_bool_t
_hb_wasm_shape (hb_shape_plan_t *shape_plan,
hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features)
{
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bool ret = true;
const hb_wasm_face_data_t *face_data = font->face->data.wasm;
constexpr uint32_t stack_size = 8092, heap_size = 8092;
wasm_module_inst_t module_inst = nullptr;
wasm_exec_env_t exec_env = nullptr;
wasm_function_inst_t shape_func = nullptr;
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module_inst = wasm_runtime_instantiate(face_data->wasm_module,
stack_size, heap_size,
nullptr, 0);
if (!module_inst)
{
DEBUG_MSG (WASM, face_data->wasm_module, "Instantiate wasm module failed.");
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goto fail;
}
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exec_env = wasm_runtime_create_exec_env (module_inst, stack_size);
if (!exec_env) {
DEBUG_MSG (WASM, module_inst, "Create wasm execution environment failed.");
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goto fail;
}
if (!(shape_func = wasm_runtime_lookup_function (module_inst, "shape", nullptr)))
{
DEBUG_MSG (WASM, module_inst, "Shape function not found.");
goto fail;
}
uint32_t font_ref;
uint32_t buffer_ref;
// cmake -DWAMR_BUILD_REF_TYPES=1 for these to work
if (!wasm_externref_obj2ref (module_inst, font, &font_ref) ||
!wasm_externref_obj2ref (module_inst, buffer, &buffer_ref))
{
DEBUG_MSG (WASM, module_inst, "Failed to register objects.");
goto fail;
}
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wasm_val_t results[1];
wasm_val_t arguments[2];
results[0].kind = WASM_I32;
arguments[0].kind = WASM_I32;
arguments[0].of.i32 = font_ref;
arguments[1].kind = WASM_I32;
arguments[1].of.i32 = buffer_ref;
if (!wasm_runtime_call_wasm_a (exec_env, shape_func,
ARRAY_LENGTH (results), results,
ARRAY_LENGTH (arguments), arguments))
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{
DEBUG_MSG (WASM, module_inst, "Calling shape function failed: %s",
wasm_runtime_get_exception(module_inst));
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goto fail;
}
printf ("%i\n", results[0].of.i32);
if (!face_data)
goto fail;
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if (0)
{
fail:
ret = false;
}
if (exec_env)
wasm_runtime_destroy_exec_env (exec_env);
if (module_inst)
wasm_runtime_deinstantiate (module_inst);
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return ret;
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}
#endif