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Merge pull request #1551 from lightpanda-io/nikneym/u8-clamped-array

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`simpleZigValueToJs`: support `Uint8ClampedArray`
This commit is contained in:
Karl Seguin
2026-02-15 19:55:11 +08:00
committed by GitHub
parent 1f4a2fd654 26ce9b2d4a
commit c9433782d8
1 changed files with 45 additions and 0 deletions
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45
src/browser/js/js.zig
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@@ -77,6 +77,17 @@ pub const ArrayBuffer = struct {
}
};
/// `ref` indicates bytes are not copied by `simpleZigValueToJs`;
/// instead, `values` references an already allocated memory. Note that
/// this variant assumes memory is (de)allocated by an arena allocator.
///
/// `copy` behaves the same as `TypedArray(T)`.
pub fn Uint8ClampedArray(comptime state: enum(u1) { ref, copy }) type {
return struct {
values: if (state == .ref) []u8 else []const u8,
};
}
pub const Exception = struct {
local: *const Local,
handle: *const v8.Value,
@@ -194,6 +205,40 @@ pub fn simpleZigValueToJs(isolate: Isolate, value: anytype, comptime fail: bool,
// but this can never be valid.
@compileError("Invalid TypeArray type: " ++ @typeName(value_type));
},
Uint8ClampedArray(.ref) => {
const values = value.values;
const len = values.len;
var array_buffer: *const v8.ArrayBuffer = undefined;
if (len == 0) {
array_buffer = v8.v8__ArrayBuffer__New(isolate.handle, 0).?;
} else {
// `deleter` cannot be null.
const empty_deleter = struct {
fn deleter(_: ?*anyopaque, _: usize, _: ?*anyopaque) callconv(.c) void {}
}.deleter;
const backing_store = v8.v8__ArrayBuffer__NewBackingStore2(values.ptr, len, empty_deleter, null);
const backing_store_ptr = v8.v8__BackingStore__TO_SHARED_PTR(backing_store);
// Attach store to array buffer.
array_buffer = v8.v8__ArrayBuffer__New2(isolate.handle, &backing_store_ptr).?;
}
return @ptrCast(v8.v8__Uint8ClampedArray__New(array_buffer, 0, len));
},
Uint8ClampedArray(.copy) => {
const values = value.values;
const len = values.len;
var array_buffer: *const v8.ArrayBuffer = undefined;
if (len == 0) {
array_buffer = v8.v8__ArrayBuffer__New(isolate.handle, 0).?;
} else {
const backing_store = v8.v8__ArrayBuffer__NewBackingStore(isolate.handle, len);
const data: [*]u8 = @ptrCast(@alignCast(v8.v8__BackingStore__Data(backing_store)));
@memcpy(data[0..len], @as([]const u8, @ptrCast(values))[0..len]);
const backing_store_ptr = v8.v8__BackingStore__TO_SHARED_PTR(backing_store);
// Attach store to array buffer.
array_buffer = v8.v8__ArrayBuffer__New2(isolate.handle, &backing_store_ptr).?;
}
return @ptrCast(v8.v8__Uint8ClampedArray__New(array_buffer, 0, len));
},
inline String, BigInt, Integer, Number, Value, Object => return value.handle,
else => {},
}