47 lines
1.4 KiB
TypeScript
47 lines
1.4 KiB
TypeScript
import { describe, expect, it } from 'vitest'
|
|
import { encodePng } from '@/lib/services/swf/nitro-builder'
|
|
import { cropRgba, decodePng } from './png-decode'
|
|
|
|
describe('png-decode', () => {
|
|
it('round-trips an RGBA image through encodePng → decodePng', () => {
|
|
const w = 3
|
|
const h = 2
|
|
const rgba = Buffer.from([
|
|
// row 0
|
|
255, 0, 0, 255, 0, 255, 0, 255, 0, 0, 255, 255,
|
|
// row 1
|
|
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120,
|
|
])
|
|
const png = encodePng(w, h, rgba)
|
|
const dec = decodePng(png)
|
|
expect(dec.width).toBe(w)
|
|
expect(dec.height).toBe(h)
|
|
expect(Buffer.compare(dec.rgba, rgba)).toBe(0)
|
|
})
|
|
|
|
it('decodes a larger gradient losslessly', () => {
|
|
const w = 16
|
|
const h = 16
|
|
const rgba = Buffer.alloc(w * h * 4)
|
|
for (let i = 0; i < w * h; i++) {
|
|
rgba[i * 4] = i % 256
|
|
rgba[i * 4 + 1] = (i * 3) % 256
|
|
rgba[i * 4 + 2] = (i * 7) % 256
|
|
rgba[i * 4 + 3] = 255
|
|
}
|
|
const dec = decodePng(encodePng(w, h, rgba))
|
|
expect(Buffer.compare(dec.rgba, rgba)).toBe(0)
|
|
})
|
|
|
|
it('crops a sub-region', () => {
|
|
// 2x2 sheet, crop the bottom-right 1x1 pixel
|
|
const sheet = Buffer.from([1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4])
|
|
const cropped = cropRgba(sheet, 2, 1, 1, 1, 1)
|
|
expect([...cropped]).toEqual([4, 4, 4, 4])
|
|
})
|
|
|
|
it('rejects non-PNG input', () => {
|
|
expect(() => decodePng(Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]))).toThrow('not a PNG')
|
|
})
|
|
})
|