/**
* Test for BMP to PNG conversion in clipboard image handling.
* Separate from clipboard-image.test.ts due to different mocking requirements.
*
* This tests the fix for WSL2/WSLg where clipboard often provides image/bmp
* instead of image/png.
*/
import { describe, expect, test, vi } from "vitest";
function createTinyBmp1x1Red24bpp(): Uint8Array {
// Minimal 1x1 24bpp BMP (BGR + row padding to 4 bytes)
// File size = 14 (BMP header) + 40 (DIB header) + 4 (pixel row) = 58
const buffer = Buffer.alloc(58);
// BITMAPFILEHEADER
buffer.write("BM", 0, "ascii");
buffer.writeUInt32LE(buffer.length, 2); // file size
buffer.writeUInt16LE(0, 6); // reserved1
buffer.writeUInt16LE(0, 8); // reserved2
buffer.writeUInt32LE(54, 10); // pixel data offset
// BITMAPINFOHEADER
buffer.writeUInt32LE(40, 14); // DIB header size
buffer.writeInt32LE(1, 18); // width
buffer.writeInt32LE(1, 22); // height (positive = bottom-up)
buffer.writeUInt16LE(1, 26); // planes
buffer.writeUInt16LE(24, 28); // bits per pixel
buffer.writeUInt32LE(0, 30); // compression (BI_RGB)
buffer.writeUInt32LE(4, 34); // image size (incl. padding)
buffer.writeInt32LE(0, 38); // x pixels per meter
buffer.writeInt32LE(0, 42); // y pixels per meter
buffer.writeUInt32LE(0, 46); // colors used
buffer.writeUInt32LE(0, 50); // important colors
// Pixel data (B, G, R) + 1 byte padding
buffer[54] = 0x00; // B
buffer[55] = 0x00; // G
buffer[56] = 0xff; // R
buffer[57] = 0x00; // padding
return new Uint8Array(buffer);
}
// Mock wl-paste to return BMP
vi.mock("child_process", async () => {
const actual = await vi.importActual<typeof import("child_process")>("child_process");
return {
...actual,
spawnSync: vi.fn((command: string, args: string[]) => {
if (command === "wl-paste" && args.includes("--list-types")) {
return { status: 0, stdout: Buffer.from("image/bmp\n"), error: null };
}
if (command === "wl-paste" && args.includes("image/bmp")) {
return { status: 0, stdout: Buffer.from(createTinyBmp1x1Red24bpp()), error: null };
}
return { status: 1, stdout: Buffer.alloc(0), error: null };
}),
};
});
// Mock the native clipboard (not used in Wayland path, but needs to be mocked)
vi.mock("@mariozechner/clipboard", () => ({
default: {
hasImage: vi.fn(() => false),
getImageBinary: vi.fn(() => Promise.resolve(null)),
},
}));
describe("readClipboardImage BMP conversion", () => {
test("converts BMP to PNG on Wayland/WSLg", async () => {
const { readClipboardImage } = await import("../src/utils/clipboard-image.js");
// Simulate Wayland session (WSLg)
const image = await readClipboardImage({
env: { WAYLAND_DISPLAY: "wayland-0" },
platform: "linux",
});
expect(image).not.toBeNull();
expect(image!.mimeType).toBe("image/png");
// Verify PNG magic bytes
expect(image!.bytes[0]).toBe(0x89);
expect(image!.bytes[1]).toBe(0x50); // P
expect(image!.bytes[2]).toBe(0x4e); // N
expect(image!.bytes[3]).toBe(0x47); // G
});
});