image: Rename background_color module
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Sophie Herold
parent
139bd4ebb2
commit
3d5ef4038e
2 changed files with 1 additions and 187 deletions
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@ -29,8 +29,8 @@
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//!
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//!
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//! [`decoder`]: crate::decoder
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//! [`decoder`]: crate::decoder
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mod background_color;
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mod drag;
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mod drag;
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mod guess_background_color;
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mod input_handling;
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mod input_handling;
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mod loading;
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mod loading;
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mod metadata;
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mod metadata;
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@ -1,186 +0,0 @@
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// Copyright (c) 2023 Sophie Herold
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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use super::*;
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impl LpImage {
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/// Returns the background color that should be used with this image
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///
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/// Returns the default color if no one has been guessed yet
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pub fn background_color(&self) -> gdk::RGBA {
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let imp = self.imp();
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if let Some(fixed) = *imp.fixed_background_color.borrow() {
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return fixed;
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}
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(*imp.background_color.borrow()).unwrap_or_else(Self::default_background_color)
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}
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pub fn set_fixed_background_color(&self, color: Option<gdk::RGBA>) {
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self.imp().fixed_background_color.replace(color);
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}
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pub(super) fn set_background_color(&self, color: Option<gdk::RGBA>) {
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self.imp().background_color.replace(color);
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}
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pub fn default_background_color() -> gdk::RGBA {
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if adw::StyleManager::default().is_dark() {
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*BACKGROUND_COLOR_DEFAULT
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} else {
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*BACKGROUND_COLOR_DEFAULT_LIGHT_MODE
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}
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}
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pub fn alternate_background_color() -> gdk::RGBA {
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if adw::StyleManager::default().is_dark() {
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*BACKGROUND_COLOR_ALTERNATE
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} else {
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*BACKGROUND_COLOR_ALTERNATE_LIGHT_MODE
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}
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}
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/// Returns a background color that should give suitable contrast with
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/// transparent images
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///
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/// For non-transparent images this always returns
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/// `BACKGROUND_COLOR_DEFAULT`
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pub async fn background_color_guess(&self) -> Option<gdk::RGBA> {
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let imp = self.imp();
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if imp.fixed_background_color.borrow().is_some() {
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return None;
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}
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// Shortcut for formats that don't support transparency
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if !self
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.metadata()
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.format()
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.map_or(true, |x| x.is_potentially_transparent())
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{
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log::debug!("This format does not support transparency");
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return Some(Self::default_background_color());
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}
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let (width, height) = self.original_dimensions();
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let max_size = i32::max(width, height);
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// Only use max 200px size scaled image for analysis
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let zoom = f64::min(1., 200. / max_size as f64);
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let snapshot = gtk::Snapshot::new();
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let render_options = tiling::RenderOptions {
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scaling_filter: gsk::ScalingFilter::Nearest,
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background_color: None,
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scaling: 1.,
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};
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self.imp()
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.frame_buffer
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.load()
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.add_to_snapshot(&snapshot, zoom, &render_options);
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let node = snapshot.to_node()?;
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let renderer = self.root()?.renderer();
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if !renderer.is_realized() {
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return None;
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}
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// Render the small version of the image and download to RAM
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let texture = renderer.render_texture(node, None);
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let mut downloader = gdk::TextureDownloader::new(&texture);
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downloader.set_format(gdk::MemoryFormat::R8g8b8a8);
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let (bytes, stride) = downloader.download_bytes();
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// Get here because only available in main thread
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let alternate_color = Self::alternate_background_color();
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let default_color = Self::default_background_color();
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gio::spawn_blocking(move || {
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let mut has_transparency = false;
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let mut bytes_iter = bytes.iter();
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// Number of transparent pixels
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let mut completely_transparent = 0;
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// Number of non-transparent pixels with bad contrast
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let mut bad_contrast = 0;
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'img: loop {
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for _ in 0..texture.width() {
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let Some(r) = bytes_iter.next() else {
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break 'img;
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};
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let Some(g) = bytes_iter.next() else {
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break 'img;
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};
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let Some(b) = bytes_iter.next() else {
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break 'img;
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};
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let Some(a) = bytes_iter.next() else {
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break 'img;
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};
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if *a < 255 {
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has_transparency = true;
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}
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if *a == 0 {
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completely_transparent += 1;
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} else {
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let fg = gdk::RGBA::new(
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*r as f32 / 255.,
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*g as f32 / 255.,
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*b as f32 / 255.,
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*a as f32 / 255.,
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);
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let contrast = crate::util::contrast_ratio(&default_color, &fg);
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if contrast < BACKGROUND_GUESS_LOW_CONTRAST_RATIO {
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bad_contrast += 1;
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}
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}
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}
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let advance_by = stride - 4 * texture.width() as usize;
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if advance_by > 0 {
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bytes_iter.nth(advance_by - 1);
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}
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}
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if !has_transparency {
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log::debug!("This image does not have transparency");
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return Some(default_color);
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}
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let n_pixels = texture.width() * texture.height();
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let part_bad_contrast = if completely_transparent < n_pixels {
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bad_contrast as f64 / (n_pixels as f64 - completely_transparent as f64)
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} else {
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1.
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};
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if part_bad_contrast > BACKGROUND_GUESS_LOW_CONTRAST_TRHESHOLD {
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Some(alternate_color)
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} else {
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Some(default_color)
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}
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})
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.await
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.ok()?
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}
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}
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