SftButton/DLL 3.0 - Button Control

Button Images

SftButton supports three independent image layers, each with its own per-state pictures. Every picture field is an SFT_PICTURE structure that can reference a bitmap, icon, image list entry, check-box / radio-button style, or (when GDI+ is available) a PNG / TIFF / JPEG / GIF / EMF image.

Layers and fields

Fallback

Hover, Pressed and Disabled variants are optional. If a per-state field is left empty, the control falls back to the base variant. A button that only defines Picture1 renders the same image in every state.

Transparency

Bitmaps are automatically made transparent by inspecting the top-left pixel - see Bitmap Transparency. Icons, image list entries and GDI+ images preserve their native transparency. Alpha-blended GDI+ images (PNG with transparency, TIFF, EMF+) render correctly over gradients and background pictures.

Image scaling and DPI

By default, images are scaled by currentDPI / 96 so a single set of 96-DPI bitmaps renders at the right physical size on any monitor. Applications that ship pre-scaled images and want them drawn at their native pixel size can call SetImageScaling with SFTBUTTON_IMAGESCALING_ASIS. See Per-Monitor DPI and Scaling.