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|
use std::{
collections::HashMap,
path::{Path, PathBuf},
};
use gdk::{gdk_pixbuf::Pixbuf, prelude::GdkContextExt};
use librsvg::SvgHandle;
use mime_guess::mime;
use diaphragm_core::{
styles::{DefinedDashStyle, Pattern},
text::{DefinedFontDescription, FontDescription},
Renderer,
};
enum Image {
Pixbuf(Pixbuf),
Svg(SvgHandle),
}
impl Image {
fn width(&self) -> f64 {
match self {
Image::Pixbuf(pixbuf) => pixbuf.width() as f64,
Image::Svg(handle) => {
let dimensions = librsvg::CairoRenderer::new(handle).intrinsic_dimensions();
// TODO: this doesn't check if the SVG has different unit for width of height
dimensions.width.length
}
}
}
fn height(&self) -> f64 {
match self {
Image::Pixbuf(pixbuf) => pixbuf.height() as f64,
Image::Svg(handle) => {
let dimensions = librsvg::CairoRenderer::new(handle).intrinsic_dimensions();
// TODO: this doesn't check if the SVG has different unit for width of height
dimensions.height.length
}
}
}
}
pub struct CairoRenderer {
ctx: cairo::Context,
loaded_images: HashMap<PathBuf, Image>,
}
impl CairoRenderer {
pub fn new() -> Self {
// HACK: a bit ugly, but text_extents requires a context, so we have to create a "dummy"
// surface
let surface = cairo::SvgSurface::for_stream(1920., 1080., std::io::sink()).unwrap();
let ctx = cairo::Context::new(&surface).unwrap();
Self {
ctx,
loaded_images: HashMap::new(),
}
}
fn load_image(&mut self, path: &Path) {
if self.loaded_images.contains_key(path) {
return;
}
let mime_type = mime_guess::from_path(&path).first().unwrap();
assert_eq!(mime_type.type_(), "image", "File is not an image");
let image = match mime_type.subtype() {
mime::SVG => Image::Svg(librsvg::Loader::new().read_path(path).unwrap()),
// TODO: use Pixbuf::formats() to check for supported formats
mime::PNG | mime::GIF | mime::JPEG => Image::Pixbuf(Pixbuf::from_file(path).unwrap()),
other => panic!("Unsupported image type: {}", other),
};
self.loaded_images.insert(path.to_owned(), image);
}
fn get_image(&self, path: &Path) -> &Image {
self.loaded_images.get(path).unwrap()
}
}
impl Default for CairoRenderer {
fn default() -> Self {
Self::new()
}
}
impl Renderer for CairoRenderer {
fn set_size(&mut self, width: f64, height: f64) {
let surface = cairo::SvgSurface::for_stream(width, height, std::io::stdout()).unwrap();
self.ctx = cairo::Context::new(&surface).unwrap();
}
fn move_to(&mut self, x: f64, y: f64) {
self.ctx.move_to(x, y)
}
fn stroke(&mut self) {
self.ctx.stroke().unwrap();
}
fn fill(&mut self) {
self.ctx.fill().unwrap();
}
fn fill_preserve(&mut self) {
self.ctx.fill_preserve().unwrap();
}
fn set_pattern(&mut self, pattern: &Pattern) {
match pattern {
Pattern::Solid(color) => {
let (red, green, blue, alpha) = color.rgba();
self.ctx.set_source_rgba(red, green, blue, alpha)
}
Pattern::None => {}
_ => panic!("Unhandled pattern"),
}
}
fn set_dash(&mut self, dash: &DefinedDashStyle) {
self.ctx.set_dash(dash.dashes(), dash.offset());
}
fn clear_dash(&mut self) {
self.ctx.set_dash(&[], 0.);
}
fn set_line_width(&mut self, width: f64) {
self.ctx.set_line_width(width);
}
fn line_to(&mut self, x: f64, y: f64) {
self.ctx.line_to(x, y)
}
fn rectangle(&mut self, x: f64, y: f64, width: f64, height: f64) {
self.ctx.rectangle(x, y, width, height);
}
fn text_extents(&self, text: &str, font: &FontDescription) -> (f64, f64) {
// Pango gives us integer back, so we lose some precision. We use this for that.
const TEST_ABSOLUTE_SIZE: f64 = 10_000.;
let layout = pangocairo::create_layout(&self.ctx);
let mut font_desc = pango::FontDescription::from_string(&font.family);
font_desc.set_absolute_size(TEST_ABSOLUTE_SIZE * pango::SCALE as f64);
layout.set_font_description(Some(&font_desc));
layout.set_markup(text);
// TODO: get height from the baseline
// let mut layout_iter = layout.iter();
// let _height = loop {
// if layout_iter.at_last_line() {
// break layout_iter.baseline();
// }
// layout_iter.next_line();
// };
let (_, extents) = layout.pixel_extents();
(
extents.width() as f64 / TEST_ABSOLUTE_SIZE,
extents.height() as f64 / TEST_ABSOLUTE_SIZE,
)
}
fn show_text(&mut self, text: &str, font: &DefinedFontDescription) {
let layout = pangocairo::create_layout(&self.ctx);
let mut font_desc = pango::FontDescription::from_string(&font.family);
font_desc.set_absolute_size(font.size * pango::SCALE as f64);
layout.set_font_description(Some(&font_desc));
layout.set_markup(text);
pangocairo::show_layout(&self.ctx, &layout);
}
fn show_image(&mut self, path: &Path, x: f64, y: f64, width: f64, height: f64) {
self.load_image(path);
let image = self.get_image(path);
self.ctx.save().unwrap();
match image {
Image::Pixbuf(pixbuf) => {
let scale_x = width / image.width();
let scale_y = height / image.height();
self.ctx.scale(scale_x, scale_y);
self.ctx.set_source_pixbuf(pixbuf, x / scale_x, y / scale_y);
self.ctx.paint().unwrap();
}
Image::Svg(handle) => {
// TODO: if aspect ratio is not kept, the image is not "scaled", only margins are
// added
librsvg::CairoRenderer::new(handle)
.render_document(&self.ctx, &cairo::Rectangle::new(x, y, width, height))
.unwrap();
}
}
self.ctx.restore().unwrap();
}
fn geometry_for_image(&mut self, path: &Path) -> (f64, f64) {
self.load_image(path);
let image = self.get_image(path);
(image.width(), image.height())
}
}
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