Tabler Icons, MIT license. Source commit: a4ce1404bc6d24d3c365afe7b258d6bf6f48d62d.
https://github.com/tabler/tabler-icons
Outline SVGs: currentColor replaced with #334155 for Qt SVG rendering.

chevron-down.svg and chevron-up.svg are rotated derivatives of chevron-right.svg.

minimize.svg, fit-width.svg and pin.svg are original PDFBoard icons using the same outline style, distributed under the project GPL-3.0-only license.

Paper Study B: SVGs are tinted by PDFBoardTheme at runtime for neutral, selected and disabled states. laser.svg, check.svg and dot.svg are original PDFBoard artwork (GPL-3.0-only). Laser uses a barrel/button/radiating-light silhouette, informed by the user-provided reference; paths were drawn for this project.

app.svg is original PDFBoard artwork under GPL-3.0-only.

The selected Paper & Pen pixel app mark (app.svg and ../win/PDFBoard.ico) is original PDFBoard artwork, GPL-3.0-only. ICO sizes 16/24/32/48/64/128/256 are generated by scripts/build-pixel-icon.py; 16 px uses a simplified optical drawing.

## 2026-10-18 像素工具图标

除 app.svg 外，当前工具 SVG 由 PDFBoard 在 24×24 整数网格重新绘制，为项目原创像素轮廓，随项目 GPL-3.0 分发。旧 Tabler 来源与 MIT 许可继续保留作为历史来源记录。

## 2026-10-19 用户批准的 B 图集

approved-b.png 是用户批准完整预览所用的原始生成图集，未重新绘制；approved-b-extra.png 以它为参考生成，补齐图形、复制、剪切、粘贴、删除、截图、固定、设置、缩放等二级图标。两图均由本项目通过 OpenAI 图像生成工具生成，按项目 GPL-3.0 分发；并非 Tabler 素材。图集为 4×4 透明 PNG，由 UBPDFBoardTheme 按格读取。保留原色、最近邻缩放和禁用透明度，不自动染成单色。

这是经过视觉认可的生成图集，不宣称具有严格的原生 24×24/32×32 像素网格。图标格索引及名称映射以 UBPDFBoardTheme.h 为准。原 SVG 用于未映射的简单控件符号和兼容，重跑 generate-pixel-icons.py 不会替换批准图集。