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Add convenience bindings for javascript to check filetype and to get primary image handle #1218

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merged 2 commits into from
Jul 3, 2024
Merged

Add convenience bindings for javascript to check filetype and to get primary image handle #1218

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7b11087
add js binding to check filetype
EzraH442 Jul 3, 2024
87fcd2d
add js binding to get primary image handle
EzraH442 Jul 3, 2024
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33 changes: 33 additions & 0 deletions libheif/api/libheif/heif_emscripten.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,11 @@ static struct heif_error _heif_context_read_from_memory(
return heif_context_read_from_memory(context, data.data(), data.size(), nullptr);
}

static heif_filetype_result heif_js_check_filetype(const std::string& data)
{
return heif_check_filetype((const uint8_t*) data.data(), data.size());
}

static emscripten::val heif_js_context_get_image_handle(
struct heif_context* context, heif_item_id id)
{
Expand All @@ -41,6 +46,25 @@ static emscripten::val heif_js_context_get_image_handle(
return emscripten::val(handle);
}

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

heif_image_handle* handle;
struct heif_error err = heif_context_get_primary_image_handle(context, &handle);

if (err.code != heif_error_Ok) {
return emscripten::val(err);
}

return emscripten::val(handle);
}


static emscripten::val heif_js_context_get_list_of_top_level_image_IDs(
struct heif_context* context)
{
Expand Down Expand Up @@ -272,11 +296,15 @@ EMSCRIPTEN_BINDINGS(libheif) {
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",
Expand Down Expand Up @@ -419,6 +447,11 @@ EMSCRIPTEN_BINDINGS(libheif) {
.value("heif_channel_B", heif_channel_B)
.value("heif_channel_Alpha", heif_channel_Alpha)
.value("heif_channel_interleaved", heif_channel_interleaved);
emscripten::enum_<heif_filetype_result>("heif_filetype_result")
.value("heif_filetype_no", heif_filetype_no)
.value("heif_filetype_yes_supported", heif_filetype_yes_supported)
.value("heif_filetype_yes_unsupported", heif_filetype_yes_unsupported)
.value("heif_filetype_maybe", heif_filetype_maybe);

emscripten::class_<heif_context>("heif_context");
emscripten::class_<heif_image_handle>("heif_image_handle");
Expand Down
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