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Add heif_items API to emscripten #1462

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51f2924
WIP add heif_items API to emscripten
dukesook Feb 11, 2025
aa28c33
emscripten: heif_js_context_get_list_of_item_IDs()
dukesook Feb 19, 2025
282aa12
emscripten: heif_js_item_get_item_type_string()
dukesook Feb 19, 2025
e5c1b61
emscripten: heif_item_is_item_hidden()
dukesook Feb 19, 2025
f00ae36
emscripten: heif_js_item_get_mime_item_content_type()
dukesook Feb 20, 2025
848bfe3
ignore buildjs/ directory
dukesook Feb 20, 2025
308de3f
emscripten: replace malloc() with alloca()
dukesook Feb 20, 2025
3611a05
emscripten: group like-functions for readability
dukesook Feb 20, 2025
ada9e61
emscripten: enforce naming convention
dukesook Feb 20, 2025
fe6a4bd
emscripten: use 'js' instead of '_' to label as JavaScript functions
dukesook Feb 20, 2025
d8d507d
emscripten: have heif_item_get_item_type() return a string instead of…
dukesook Feb 20, 2025
5aa7989
emscripten: heif_js_item_get_mime_item_content_encoding()
dukesook Feb 20, 2025
f78ec0e
emscripten: heif_js_item_get_uri_item_uri_type()
dukesook Feb 20, 2025
e327a18
emscripten: heif_item_get_item_name()
dukesook Feb 20, 2025
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@

build
_build
buildjs
third-party/SVT-AV1/
third-party/dav1d/
third-party/libwebp/
Expand Down
139 changes: 118 additions & 21 deletions libheif/api/libheif/heif_emscripten.h
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Original file line number Diff line number Diff line change
Expand Up @@ -12,13 +12,14 @@
#include <cassert>

#include "heif.h"
#include "heif_items.h"

static std::string _heif_get_version()
static std::string heif_js_get_version()
{
return heif_get_version();
}

static struct heif_error _heif_context_read_from_memory(
static struct heif_error heif_js_context_read_from_memory(
struct heif_context* context, const std::string& data)
{
return heif_context_read_from_memory(context, data.data(), data.size(), nullptr);
Expand Down Expand Up @@ -78,7 +79,7 @@ static emscripten::val heif_js_context_get_list_of_top_level_image_IDs(
return result;
}

heif_item_id* ids = (heif_item_id*) malloc(count * sizeof(heif_item_id));
heif_item_id* ids = (heif_item_id*) alloca(count * sizeof(heif_item_id));
if (!ids) {
struct heif_error err;
err.code = heif_error_Memory_allocation_error;
Expand All @@ -95,10 +96,98 @@ static emscripten::val heif_js_context_get_list_of_top_level_image_IDs(
for (int i = 0; i < received; i++) {
result.set(i, ids[i]);
}
free(ids);
return result;
}


static emscripten::val heif_js_context_get_list_of_item_IDs(
struct heif_context* context)
{
emscripten::val result = emscripten::val::array();
if (!context) {
return result;
}

int count = heif_context_get_number_of_items(context);
if (count <= 0) {
return result;
}

heif_item_id* ids = (heif_item_id*) alloca(count * sizeof(heif_item_id));
if (!ids) {
struct heif_error err;
err.code = heif_error_Memory_allocation_error;
err.subcode = heif_suberror_Security_limit_exceeded;
return emscripten::val(err);
}

int num_ids_received = heif_context_get_list_of_item_IDs(context, ids, count);

for (int i = 0; i < num_ids_received; i++) {
result.set(i, ids[i]);
}

return result;
}


static emscripten::val heif_js_item_get_item_type(
const struct heif_context* ctx, heif_item_id id)
{
uint32_t type = heif_item_get_item_type(ctx, id);
std::string type_string = fourcc_to_string(type);
return emscripten::val(type_string);
}


static emscripten::val heif_js_item_get_mime_item_content_type(
const struct heif_context* ctx, heif_item_id id)
{
std::string content_type = "";
const char* cstring = heif_item_get_mime_item_content_type(ctx, id);
if (cstring) {
content_type = cstring;
}
return emscripten::val(content_type);
}


static emscripten::val heif_js_item_get_mime_item_content_encoding(
const struct heif_context* ctx, heif_item_id id)
{
std::string content_encoding = "";
const char* cstring = heif_item_get_mime_item_content_encoding(ctx, id);
if (cstring) {
content_encoding = cstring;
}
return emscripten::val(content_encoding);
}


static emscripten::val heif_js_item_get_uri_item_uri_type(
const struct heif_context* ctx, heif_item_id id)
{
std::string uri_type = "";
const char* cstring = heif_item_get_uri_item_uri_type(ctx, id);
if (cstring) {
uri_type = cstring;
}
return emscripten::val(uri_type);
}


static emscripten::val heif_js_item_get_item_name(
const struct heif_context* ctx, heif_item_id id)
{
std::string item_name = "";
const char* cstring = heif_item_get_item_name(ctx, id);
if (cstring) {
item_name = cstring;
}
return emscripten::val(item_name);
}


#if 0
static void strided_copy(void* dest, const void* src, int width, int height,
int stride)
Expand Down Expand Up @@ -288,33 +377,41 @@ static emscripten::val heif_js_decode_image2(struct heif_image_handle* handle,
emscripten::function(#name, &name, emscripten::allow_raw_pointers())

EMSCRIPTEN_BINDINGS(libheif) {
emscripten::function("heif_get_version", &_heif_get_version,
emscripten::allow_raw_pointers());

// heif.h
emscripten::function("heif_get_version", &heif_js_get_version, emscripten::allow_raw_pointers());
emscripten::function("heif_context_read_from_memory", &heif_js_context_read_from_memory, emscripten::allow_raw_pointers());
emscripten::function("heif_check_filetype", &heif_js_check_filetype, emscripten::allow_raw_pointers());
emscripten::function("heif_context_get_list_of_top_level_image_IDs", &heif_js_context_get_list_of_top_level_image_IDs, emscripten::allow_raw_pointers());
emscripten::function("heif_context_get_image_handle", &heif_js_context_get_image_handle, emscripten::allow_raw_pointers());
emscripten::function("heif_context_get_primary_image_handle", &heif_js_context_get_primary_image_handle, emscripten::allow_raw_pointers());
emscripten::function("heif_js_decode_image2", &heif_js_decode_image2, emscripten::allow_raw_pointers());
EXPORT_HEIF_FUNCTION(heif_get_version_number);

EXPORT_HEIF_FUNCTION(heif_context_alloc);
EXPORT_HEIF_FUNCTION(heif_context_free);
emscripten::function("heif_context_read_from_memory",
&_heif_context_read_from_memory, emscripten::allow_raw_pointers());
emscripten::function("heif_js_check_filetype",
&heif_js_check_filetype, emscripten::allow_raw_pointers());
EXPORT_HEIF_FUNCTION(heif_context_get_number_of_top_level_images);
emscripten::function("heif_js_context_get_list_of_top_level_image_IDs",
&heif_js_context_get_list_of_top_level_image_IDs, emscripten::allow_raw_pointers());
emscripten::function("heif_js_context_get_image_handle",
&heif_js_context_get_image_handle, emscripten::allow_raw_pointers());
emscripten::function("heif_js_context_get_primary_image_handle",
&heif_js_context_get_primary_image_handle, emscripten::allow_raw_pointers());
//emscripten::function("heif_js_decode_image",
//&heif_js_decode_image, emscripten::allow_raw_pointers());
emscripten::function("heif_js_decode_image2",
&heif_js_decode_image2, emscripten::allow_raw_pointers());
EXPORT_HEIF_FUNCTION(heif_image_handle_release);
EXPORT_HEIF_FUNCTION(heif_image_handle_get_width);
EXPORT_HEIF_FUNCTION(heif_image_handle_get_height);
EXPORT_HEIF_FUNCTION(heif_image_handle_is_primary_image);
EXPORT_HEIF_FUNCTION(heif_image_release);

// heif_items.h
emscripten::function("heif_context_get_list_of_item_IDs", &heif_js_context_get_list_of_item_IDs, emscripten::allow_raw_pointers());
emscripten::function("heif_item_get_item_type", heif_js_item_get_item_type, emscripten::allow_raw_pointers());
emscripten::function("heif_item_get_mime_item_content_type", heif_js_item_get_mime_item_content_type, emscripten::allow_raw_pointers());
emscripten::function("heif_item_get_mime_item_content_encoding", heif_js_item_get_mime_item_content_encoding, emscripten::allow_raw_pointers());
emscripten::function("heif_item_get_uri_item_uri_type", heif_js_item_get_uri_item_uri_type, emscripten::allow_raw_pointers());
emscripten::function("heif_item_get_item_name", heif_js_item_get_item_name, emscripten::allow_raw_pointers());
EXPORT_HEIF_FUNCTION(heif_context_get_number_of_items);
EXPORT_HEIF_FUNCTION(heif_item_is_item_hidden);

// DEPRECATED, use functions without the 'js' prefix.
emscripten::function("heif_js_check_filetype", &heif_js_check_filetype, emscripten::allow_raw_pointers());
emscripten::function("heif_js_context_get_list_of_top_level_image_IDs", &heif_js_context_get_list_of_top_level_image_IDs, emscripten::allow_raw_pointers());
emscripten::function("heif_js_context_get_image_handle", &heif_js_context_get_image_handle, emscripten::allow_raw_pointers());
emscripten::function("heif_js_context_get_primary_image_handle", &heif_js_context_get_primary_image_handle, emscripten::allow_raw_pointers());

emscripten::enum_<heif_error_code>("heif_error_code")
.value("heif_error_Ok", heif_error_Ok)
.value("heif_error_Input_does_not_exist", heif_error_Input_does_not_exist)
Expand Down
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