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Rename for clarity: exports => harfbuzzJsWasm
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@papandreou
papandreou committed Jul 3, 2024
1 parent 51dac5f commit 62e2eb5
Showing 1 changed file with 41 additions and 41 deletions.
82 changes: 41 additions & 41 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,13 +5,13 @@ const fontverter = require('fontverter');

const loadAndInitializeHarfbuzz = _.once(async () => {
const {
instance: { exports },
instance: { exports: harfbuzzJsWasm },
} = await WebAssembly.instantiate(
await readFile(require.resolve('harfbuzzjs/hb-subset.wasm'))
);

const heapu8 = new Uint8Array(exports.memory.buffer);
return [exports, heapu8];
const heapu8 = new Uint8Array(harfbuzzJsWasm.memory.buffer);
return { harfbuzzJsWasm, heapu8 };
});

function HB_TAG(str) {
Expand All @@ -34,76 +34,76 @@ async function subsetFont(
throw new Error('The subset text must be given as a string');
}

const [exports, heapu8] = await loadAndInitializeHarfbuzz();
const { harfbuzzJsWasm, heapu8 } = await loadAndInitializeHarfbuzz();

originalFont = await fontverter.convert(originalFont, 'truetype');

const input = exports.hb_subset_input_create_or_fail();
const input = harfbuzzJsWasm.hb_subset_input_create_or_fail();
if (input === 0) {
throw new Error(
'hb_subset_input_create_or_fail (harfbuzz) returned zero, indicating failure'
);
}

const fontBuffer = exports.malloc(originalFont.byteLength);
const fontBuffer = harfbuzzJsWasm.malloc(originalFont.byteLength);
heapu8.set(new Uint8Array(originalFont), fontBuffer);

// Create the face
const blob = exports.hb_blob_create(
const blob = harfbuzzJsWasm.hb_blob_create(
fontBuffer,
originalFont.byteLength,
2, // HB_MEMORY_MODE_WRITABLE
0,
0
);
const face = exports.hb_face_create(blob, 0);
exports.hb_blob_destroy(blob);
const face = harfbuzzJsWasm.hb_face_create(blob, 0);
harfbuzzJsWasm.hb_blob_destroy(blob);

// Do the equivalent of --font-features=*
const layoutFeatures = exports.hb_subset_input_set(
const layoutFeatures = harfbuzzJsWasm.hb_subset_input_set(
input,
6 // HB_SUBSET_SETS_LAYOUT_FEATURE_TAG
);
exports.hb_set_clear(layoutFeatures);
exports.hb_set_invert(layoutFeatures);
harfbuzzJsWasm.hb_set_clear(layoutFeatures);
harfbuzzJsWasm.hb_set_invert(layoutFeatures);

if (preserveNameIds) {
const inputNameIds = exports.hb_subset_input_set(
const inputNameIds = harfbuzzJsWasm.hb_subset_input_set(
input,
4 // HB_SUBSET_SETS_NAME_ID
);
for (const nameId of preserveNameIds) {
exports.hb_set_add(inputNameIds, nameId);
harfbuzzJsWasm.hb_set_add(inputNameIds, nameId);
}
}

if (noLayoutClosure) {
exports.hb_subset_input_set_flags(
harfbuzzJsWasm.hb_subset_input_set_flags(
input,
exports.hb_subset_input_get_flags(input) | 0x00000200 // HB_SUBSET_FLAGS_NO_LAYOUT_CLOSURE
harfbuzzJsWasm.hb_subset_input_get_flags(input) | 0x00000200 // HB_SUBSET_FLAGS_NO_LAYOUT_CLOSURE
);
}

// Add unicodes indices
const inputUnicodes = exports.hb_subset_input_unicode_set(input);
const inputUnicodes = harfbuzzJsWasm.hb_subset_input_unicode_set(input);
for (const c of text) {
exports.hb_set_add(inputUnicodes, c.codePointAt(0));
harfbuzzJsWasm.hb_set_add(inputUnicodes, c.codePointAt(0));
}

if (variationAxes) {
for (const [axisName, value] of Object.entries(variationAxes)) {
if (typeof value === 'number') {
// Simple case: Pin/instance the variation axis to a single value
if (
!exports.hb_subset_input_pin_axis_location(
!harfbuzzJsWasm.hb_subset_input_pin_axis_location(
input,
face,
HB_TAG(axisName),
value
)
) {
exports.hb_face_destroy(face);
exports.free(fontBuffer);
harfbuzzJsWasm.hb_face_destroy(face);
harfbuzzJsWasm.free(fontBuffer);
throw new Error(
`hb_subset_input_pin_axis_location (harfbuzz) returned zero when pinning ${axisName} to ${value}, indicating failure. Maybe the axis does not exist in the font?`
);
Expand All @@ -114,14 +114,14 @@ async function subsetFont(
typeof value.min === 'undefined' ||
typeof value.max === 'undefined'
) {
exports.hb_face_destroy(face);
exports.free(fontBuffer);
harfbuzzJsWasm.hb_face_destroy(face);
harfbuzzJsWasm.free(fontBuffer);
throw new Error(
`${axisName}: You must provide both a min and a max value when setting the axis range`
);
}
if (
!exports.hb_subset_input_set_axis_range(
!harfbuzzJsWasm.hb_subset_input_set_axis_range(
input,
face,
HB_TAG(axisName),
Expand All @@ -131,8 +131,8 @@ async function subsetFont(
value.default ?? NaN
)
) {
exports.hb_face_destroy(face);
exports.free(fontBuffer);
harfbuzzJsWasm.hb_face_destroy(face);
harfbuzzJsWasm.free(fontBuffer);
throw new Error(
`hb_subset_input_set_axis_range (harfbuzz) returned zero when setting the range of ${axisName} to [${value.min}; ${value.max}] and a default value of ${value.default}, indicating failure. Maybe the axis does not exist in the font?`
);
Expand All @@ -143,29 +143,29 @@ async function subsetFont(

let subset;
try {
subset = exports.hb_subset_or_fail(face, input);
subset = harfbuzzJsWasm.hb_subset_or_fail(face, input);
if (subset === 0) {
exports.hb_face_destroy(face);
exports.free(fontBuffer);
harfbuzzJsWasm.hb_face_destroy(face);
harfbuzzJsWasm.free(fontBuffer);
throw new Error(
'hb_subset_or_fail (harfbuzz) returned zero, indicating failure. Maybe the input file is corrupted?'
);
}
} finally {
// Clean up
exports.hb_subset_input_destroy(input);
harfbuzzJsWasm.hb_subset_input_destroy(input);
}

// Get result blob
const result = exports.hb_face_reference_blob(subset);
const result = harfbuzzJsWasm.hb_face_reference_blob(subset);

const offset = exports.hb_blob_get_data(result, 0);
const subsetByteLength = exports.hb_blob_get_length(result);
const offset = harfbuzzJsWasm.hb_blob_get_data(result, 0);
const subsetByteLength = harfbuzzJsWasm.hb_blob_get_length(result);
if (subsetByteLength === 0) {
exports.hb_blob_destroy(result);
exports.hb_face_destroy(subset);
exports.hb_face_destroy(face);
exports.free(fontBuffer);
harfbuzzJsWasm.hb_blob_destroy(result);
harfbuzzJsWasm.hb_face_destroy(subset);
harfbuzzJsWasm.hb_face_destroy(face);
harfbuzzJsWasm.free(fontBuffer);
throw new Error(
'Failed to create subset font, maybe the input file is corrupted?'
);
Expand All @@ -176,10 +176,10 @@ async function subsetFont(
);

// Clean up
exports.hb_blob_destroy(result);
exports.hb_face_destroy(subset);
exports.hb_face_destroy(face);
exports.free(fontBuffer);
harfbuzzJsWasm.hb_blob_destroy(result);
harfbuzzJsWasm.hb_face_destroy(subset);
harfbuzzJsWasm.hb_face_destroy(face);
harfbuzzJsWasm.free(fontBuffer);

return await fontverter.convert(subsetFont, targetFormat, 'truetype');
}
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