[ MIRROR ] Customisable, minimalist screen locker for Wayland git.ngill.net/nlock.git
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Rust
at bsd-support
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118// SPDX-License-Identifier: GPL-3.0-or-later// Copyright (C) 2025, Nathan Gill
use anyhow::{Result, anyhow};use cairo::{Format, ImageSurface};use clap::ValueEnum;use gdk_pixbuf::Pixbuf;use serde::Deserialize;
#[derive(Deserialize, Copy, Clone, PartialEq, ValueEnum)]#[serde(rename_all = "lowercase")]pub enum BackgroundImageScale { Stretch, Fill, Fit, Center, Tile,}
pub trait ImageSurfaceExt { fn create_from_pixbuf(pixbuf: &Pixbuf) -> Result<ImageSurface>;}
#[inline]fn premul(c: u16, a: u16) -> u8 { let z = (c * a) + 0x80; ((z + (z >> 8)) >> 8) as u8}
impl ImageSurfaceExt for ImageSurface { /// Create an `ImageSurface` from a `Pixbuf` /// /// The API to do this was removed from GTK :(, so this is a version ported /// from swaylock, that essentially does the same thing. fn create_from_pixbuf(pixbuf: &Pixbuf) -> Result<ImageSurface> { let chan = pixbuf.n_channels(); if chan < 3 { return Err(anyhow!(cairo::Error::InvalidFormat)); }
let pixels = pixbuf.read_pixel_bytes(); let width = pixbuf.width() as usize; let height = pixbuf.height() as usize; let stride = pixbuf.rowstride() as usize;
let fmt = if chan == 3 { Format::Rgb24 } else { Format::ARgb32 };
let mut surface = ImageSurface::create(fmt, width as i32, height as i32)?; surface.flush();
{ let cstride = surface.stride() as usize; let mut cpixels = surface.data()?;
if chan == 3 { for y in 0..height { let goff = y * stride; let coff = y * cstride;
let grow = &pixels[goff..goff + 3 * width]; let crow = &mut cpixels[coff..coff + 4 * width];
for x in 0..width { let src = &grow[3 * x..3 * x + 3]; let dst = &mut crow[4 * x..4 * x + 4];
if cfg!(target_endian = "little") { dst[0] = src[2]; dst[1] = src[1]; dst[2] = src[0]; dst[3] = 0; } else { dst[0] = 0; dst[1] = src[0]; dst[2] = src[1]; dst[3] = src[2]; } } } } else { for y in 0..height { let goff = y * stride; let coff = y * cstride;
let grow = &pixels[goff..goff + 4 * width]; let crow = &mut cpixels[coff..coff + 4 * width];
for x in 0..width { let src = &grow[4 * x..4 * x + 4]; let dst = &mut crow[4 * x..4 * x + 4];
let a = src[3] as u16;
if cfg!(target_endian = "little") { dst[0] = premul(src[2] as u16, a); dst[1] = premul(src[1] as u16, a); dst[2] = premul(src[0] as u16, a); dst[3] = a as u8; } else { dst[0] = a as u8; dst[1] = premul(src[0] as u16, a); dst[2] = premul(src[1] as u16, a); dst[3] = premul(src[2] as u16, a); } } } } }
surface.mark_dirty(); Ok(surface) }}