macOS DMG: branded window background and icon layout
The DMG opened as a plain Finder window. It now shows the app icon's figure on the CADCraft colour, with CADCraft.app and the Applications link side by side. Same approach as PhotoCraft's and VectorCraft's (storytold/photocraft#1201, storytold/vectorcraft#493). - packaging/macos/dmg/: background.svg (source; text outlined, no paper grain, the figure an <image> of assets/app-icon), background.tiff (1x + 2x HiDPI, 16-colour palette, Deflate, sRGB; ~21 KB) and dmg-layout.DS_Store (Finder view settings: window, icon size 128, positions, background). - generate.py writes the TIFF and the layout on any OS, byte-for-byte reproducible, with nothing from the machine that ran it (no paths, users, disk names or volume UUIDs). - package.sh copies them into the staging folder; the image is still built with hdiutil makehybrid. Nothing extra runs in the signing job. - The volume name drops the version: the layout finds the background through an alias that includes the volume name. The DMG file name keeps the version. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Xus Badia
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@ -37,6 +37,8 @@ Generated-in-code assets are original and have no file to list:
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| `assets/app-icon/cadcraft-256.png` | CADCraft contributors | generated | MIT OR Apache-2.0 | |
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| `assets/app-icon/cadcraft-1024.png` | CADCraft contributors | generated | MIT OR Apache-2.0 | |
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| `assets/app-icon/cadcraft-macos-512.png` | CADCraft contributors | generated (macOS margin variant) | MIT OR Apache-2.0 | |
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| `packaging/macos/dmg/background.svg` | @XusBadia | original work for this repository (2026-10-08), "CADCraft macOS DMG window background"; derived from the CADCraft app icon (`assets/app-icon/`, referenced via `<image>`, not copied); text is outlined Inter / JetBrains Mono glyph paths (OFL fonts the project already uses); no third-party material modified | MIT OR Apache-2.0 (same as the code: `LICENSE-MIT`, `LICENSE-APACHE`) | Finder window background of the macOS DMG; `packaging/macos/dmg/generate.py` renders it to `background.tiff` (see `packaging/macos/dmg/README.md`) |
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| `packaging/macos/dmg/background.tiff` | @XusBadia | Rendered from `packaging/macos/dmg/background.svg` by `packaging/macos/dmg/generate.py` | MIT OR Apache-2.0 (same as the code: `LICENSE-MIT`, `LICENSE-APACHE`) | 1x + 2x HiDPI TIFF for the macOS DMG window; includes the app icon (see its row) and LittleCMS's built-in sRGB profile ("No copyright, use freely") |
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| `examples/apartment.dxf` | CADCraft contributors | sample drawing made with cadcraft-cli commands | MIT OR Apache-2.0 | Original |
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| `docs/images/ui-apartment.png` | CADCraft contributors | screenshot of CADCraft itself (examples/apartment.dxf) | MIT OR Apache-2.0 | Original; no Autodesk UI |
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| `docs/images/ui-layout.png` | CADCraft contributors | screenshot of CADCraft itself (a layout of examples/apartment.dxf) | MIT OR Apache-2.0 | Original; no Autodesk UI |
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@ -0,0 +1,44 @@
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# macOS DMG window
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What Finder shows when the DMG opens: a 660 × 400 pt background with the app icon and the
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`Applications` link side by side. `package.sh` copies these files into the image; nothing here is
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generated at build time, so the DMG still builds with `hdiutil makehybrid` (no mounted device, no
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Finder scripting on CI, nothing extra installed in the signing job).
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| File | What |
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|---|---|
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| `background.svg` | Source of the background: the app icon (`assets/app-icon/cadcraft-1024.png`, linked, not copied) cropped as a cover on the CADCraft colour field (`#14a3c7`), Ink and Paper. Its text (Inter, JetBrains Mono) is outlined, so rendering it needs no fonts. No paper grain: noise doesn't compress, and this keeps `background.tiff` small. |
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| `background.tiff` | The background at 1x (660 × 400 px, 72 dpi) and 2x (1320 × 800 px, 144 dpi) in one HiDPI TIFF (16-colour palette, Deflate, sRGB). Goes to `.background/background.tiff`. |
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| `dmg-layout.DS_Store` | Finder's view settings for the volume: window size, icon size 128, CADCraft.app at (326, 205), `Applications` at (574, 205), and the background. Goes to `.DS_Store` in the image; named so it isn't mistaken for (or ignored like) a Finder-generated `.DS_Store`. |
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| `generate.py` | Writes `background.tiff` and `dmg-layout.DS_Store` from the SVG and the layout above. |
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## The volume name has no version
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The mounted volume is called `CADCraft`, not `CADCraft <version>`. The layout points at the background
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through an alias that includes the volume name, and Finder resolves it by that name: with a
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versioned name the window keeps its size and icon positions but shows no background (tested).
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The DMG file name (`cadcraft-<version>-macos-<arch>.dmg`) still carries the version.
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## Rules
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- **Finder draws the icon labels in black in light and dark mode** when a window has a background,
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so the area under both icons stays light (Paper).
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- **Nothing goes inside the icon boxes:** artwork keeps 10 pt clear of each 128 pt icon box and of
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the label strip under it.
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## Regenerate
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Edit `background.svg` (or the layout constants in `generate.py`), then run, on any OS:
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```sh
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pip install 'pillow>=12' ds_store==1.3.3 mac_alias==2.2.3
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python3 packaging/macos/dmg/generate.py # needs resvg on PATH
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```
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Both outputs are byte-for-byte reproducible and carry nothing from the machine that ran it: the
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SVG renders without any fonts, and `dmg-layout.DS_Store` is written from scratch, its background
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alias holding only the volume name and `/.background/background.tiff`. If you add text to the SVG,
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outline it (`usvg` from resvg converts text to paths). The window is 660 × 432 with Finder's 32 pt
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title bar; the content area is 660 × 400.
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This follows VectorCraft's `packaging/macos/dmg/` (storytold/vectorcraft#493).
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After Width: | Height: | Size: 40 KiB |
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@ -0,0 +1,158 @@
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#!/usr/bin/env python3
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"""Regenerate background.tiff and dmg-layout.DS_Store for the macOS DMG window (see README.md here).
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Needs resvg on PATH and:
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pip install 'pillow>=12' ds_store==1.3.3 mac_alias==2.2.3
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Runs on any OS, no Mac needed. Both outputs come from this script alone, so they carry nothing
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from the machine that made them: no local paths, user or disk names, dates or volume UUIDs.
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python3 packaging/macos/dmg/generate.py
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"""
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import datetime
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import os
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import shutil
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import subprocess
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import sys
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import tempfile
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from ds_store import DSStore
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from mac_alias import Alias, TargetInfo, VolumeInfo
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from PIL import Image, ImageCms
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HERE = os.path.dirname(os.path.abspath(__file__))
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# Keep in sync with package.sh (volume name) and README.md (layout).
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VOLUME = "CADCraft"
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WIDTH, HEIGHT = 660, 400 # window content, pt; the background's 1x size
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TITLE_BAR = 32
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ICON_SIZE = 128
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PALETTE = 16 # colours in background.tiff
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ICONS = {"CADCraft.app": (326, 205), "Applications": (574, 205)}
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# A fixed date for the alias and the colour profile. Finder never matches it against the image
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# (each build is a new volume): it finds the background by volume name and path.
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FIXED_DATE = datetime.datetime(2026, 10, 8, tzinfo=datetime.timezone.utc)
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def render(svg, width, out):
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# The SVG's text is already outlined and no fonts are loaded, so every machine draws the
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# same pixels.
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subprocess.run(
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["resvg", "--skip-system-fonts", "-w", str(width), svg, out],
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check=True,
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)
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with Image.open(out) as im:
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return im.convert("RGB")
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def quantize(im):
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# No dithering: dither noise compresses badly and the artwork has flat fills.
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return im.quantize(PALETTE, method=Image.Quantize.FASTOCTREE, dither=Image.Dither.NONE)
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def srgb_profile():
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# LittleCMS's built-in sRGB ("No copyright, use freely"), with its creation date fixed.
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icc = bytearray(ImageCms.ImageCmsProfile(ImageCms.createProfile("sRGB")).tobytes())
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d = FIXED_DATE
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icc[24:36] = b"".join(v.to_bytes(2, "big") for v in (d.year, d.month, d.day, 0, 0, 0))
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if icc[84:100] != bytes(16):
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sys.exit("error: the sRGB profile has an ID; recompute it after fixing the date")
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return bytes(icc)
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def write_tiff(svg, out):
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"""1x (72 dpi) and 2x (144 dpi) in one TIFF, as `tiffutil -cathidpicheck` writes them."""
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with tempfile.TemporaryDirectory() as tmp:
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one, two = (
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quantize(render(svg, WIDTH * s, os.path.join(tmp, f"{s}x.png"))) for s in (1, 2)
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)
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two.encoderinfo = {"dpi": (144, 144)} # the rest as the first page
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# Opaque 16-colour palette, Deflate: the artwork is three inks plus antialiasing, and a palette
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# keeps the file under ~100 KB (repository assets must stay small). As PhotoCraft's.
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one.save(
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out,
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"TIFF",
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save_all=True,
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append_images=[two],
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compression="tiff_adobe_deflate", # brand-ok: Pillow's name for TIFF compression 8 (Deflate)
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dpi=(72, 72),
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icc_profile=srgb_profile(),
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)
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with Image.open(out) as im:
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im.seek(1)
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if im.info.get("dpi") != (144, 144):
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sys.exit("error: the 2x page isn't 144 dpi (needs Pillow 12 or later)")
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strips = []
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for page in (0, 1):
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im.seek(page)
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strips += zip(im.tag_v2[273], im.tag_v2[279]) # StripOffsets, StripByteCounts
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# TIFF keeps directories and tag data on even offsets. When a strip ends on an odd one, libtiff
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# leaves the padding byte after it uninitialised, so the file changed from run to run with
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# identical pixels. Zero it: nothing refers to that byte.
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starts = {o for o, _ in strips}
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with open(out, "r+b") as f:
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for o, n in strips:
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if (o + n) % 2 and o + n not in starts:
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f.seek(o + n)
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f.write(bytes(1))
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def background_alias():
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# What Finder stores for /.background/background.tiff on the volume, minus anything about the
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# machine (dmgbuild writes the same kind of alias from a mounted image). Disk type 5 (ejectable),
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# the volume flags and the folder/file ids (25, 26) are what Finder wrote on a test image; the ids
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# are only hints, as the volume's creation date.
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volume = VolumeInfo(VOLUME, FIXED_DATE, b"H+", 5, 0x0D02, b"\0\0")
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volume.posix_path = f"/Volumes/{VOLUME}"
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target = TargetInfo(0, "background.tiff", 25, 26, FIXED_DATE, b"\0\0\0\0", b"\0\0\0\0")
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target.folder_name = ".background"
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target.cnid_path = [25]
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target.carbon_path = f"{VOLUME}:.background:\0background.tiff"
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target.posix_path = "/.background/background.tiff"
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return Alias(volume=volume, target=target).to_bytes()
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def write_ds_store(out):
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if os.path.exists(out):
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os.remove(out)
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with DSStore.open(out, "w+") as d:
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d["."]["bwsp"] = {
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"ShowStatusBar": False,
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"ShowToolbar": False,
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"ShowTabView": False,
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"ContainerShowSidebar": False,
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"ShowSidebar": False,
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"WindowBounds": f"{{{{200, 528}}, {{{WIDTH}, {HEIGHT + TITLE_BAR}}}}}",
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}
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d["."]["icvp"] = {
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"viewOptionsVersion": 1,
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"backgroundType": 2,
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"backgroundImageAlias": background_alias(),
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"backgroundColorRed": 1.0,
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"backgroundColorGreen": 1.0,
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"backgroundColorBlue": 1.0,
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"gridOffsetX": 0.0,
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"gridOffsetY": 0.0,
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"gridSpacing": 100.0,
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"arrangeBy": "none",
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"showIconPreview": True,
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"showItemInfo": False,
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"labelOnBottom": True,
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"textSize": 16.0,
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"iconSize": float(ICON_SIZE),
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}
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d["."]["vSrn"] = ("long", 1)
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for name, pos in ICONS.items():
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d[name]["Iloc"] = pos
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def main():
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if not shutil.which("resvg"):
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sys.exit("error: resvg not found (brew install resvg / cargo install resvg --locked)")
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write_tiff(os.path.join(HERE, "background.svg"), os.path.join(HERE, "background.tiff"))
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write_ds_store(os.path.join(HERE, "dmg-layout.DS_Store"))
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if __name__ == "__main__":
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main()
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@ -131,10 +131,15 @@ STAGE="$WORK/dmg"
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mkdir -p "$STAGE"
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ditto "$APP" "$STAGE/CADCraft.app"
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ln -s /Applications "$STAGE/Applications"
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# Finder window layout: background, icon size and positions (packaging/macos/dmg/README.md).
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mkdir -p "$STAGE/.background"
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cp "$HERE/dmg/background.tiff" "$STAGE/.background/background.tiff"
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cp "$HERE/dmg/dmg-layout.DS_Store" "$STAGE/.DS_Store"
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rm -f "$DMG" "$WORK/raw.dmg"
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# makehybrid + convert builds the image without attaching a device, unlike `create -srcfolder`,
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# which is flaky on CI runners ("Resource busy") and hangs in sandboxed sessions.
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hdiutil makehybrid -hfs -hfs-volume-name "CADCraft $VERSION" -hfs-openfolder "$STAGE" -o "$WORK/raw.dmg" "$STAGE"
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# The volume name has no version: .DS_Store finds the background through an alias that includes it.
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hdiutil makehybrid -hfs -hfs-volume-name "CADCraft" -hfs-openfolder "$STAGE" -o "$WORK/raw.dmg" "$STAGE"
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hdiutil convert "$WORK/raw.dmg" -format UDZO -imagekey zlib-level=9 -o "$DMG"
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rm -f "$WORK/raw.dmg"
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sign "$DMG"
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