feat(media): implement native JPEG coding and bounded MJPEG streaming

packages/image/src/jpeg_encoder_tests.zigadded+23-0

Changes to packages/image/src/jpeg_encoder_tests.zig

		@@ -0,0 +1,23 @@
	1	+const std = ;
	2	+const image = ;
	3	+const jpeg = ;
	4	+test {
	5	+ _ = jpeg;
	6	+}
	7	+test "native JPEG encodes scan data readable by the Home decoder" {
	8	+ var img = try image.Image.init(std.testing.allocator, 17, 9, .rgb8);
	9	+ defer img.deinit();
	10	+ for (0..17 * 9) |i| {
	11	+ @memcpy(img.pixels[i * 3 ..][0..3], &[_]u8{ 200, 50, 100 });
	12	+ }
	13	+ const encoded = try jpeg.encodeWithQuality(std.testing.allocator, &img, 98);
	14	+ defer std.testing.allocator.free(encoded);
	15	+ var decoded = try jpeg.decode(std.testing.allocator, encoded);
	16	+ defer decoded.deinit();
	17	+ try std.testing.expectEqual(@as(u32, 17), decoded.width);
	18	+ try std.testing.expectEqual(@as(u32, 9), decoded.height);
	19	+ const pixel = decoded.getPixel(8, 4).?;
	20	+ try std.testing.expectApproxEqAbs(@as(f64, 200), @as(f64, @floatFromInt(pixel.r)), 5);
	21	+ try std.testing.expectApproxEqAbs(@as(f64, 50), @as(f64, @floatFromInt(pixel.g)), 5);
	22	+ try std.testing.expectApproxEqAbs(@as(f64, 100), @as(f64, @floatFromInt(pixel.b)), 5);
	23	+}