70 lines
2.4 KiB
Rust
70 lines
2.4 KiB
Rust
use crate::format::ARGB8888;
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use crate::pango::consts::{
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CAIRO_FORMAT_ARGB32, CAIRO_OPERATOR_SOURCE, PANGO_ELLIPSIZE_END, PANGO_SCALE,
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};
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use crate::pango::{CairoImageSurface, PangoError, PangoFontDescription};
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use crate::render::{RenderContext, RenderError, Texture};
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use crate::theme::Color;
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use std::rc::Rc;
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use thiserror::Error;
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#[derive(Debug, Error)]
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pub enum TextError {
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#[error("Could not create a cairo image")]
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CreateImage(#[source] PangoError),
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#[error("Could not create a cairo context")]
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CairoContext(#[source] PangoError),
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#[error("Could not create a pango context")]
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PangoContext(#[source] PangoError),
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#[error("Could not create a pango layout")]
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CreateLayout(#[source] PangoError),
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#[error("Could not import the rendered text")]
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RenderError(#[source] RenderError),
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#[error("Could not access the cairo image data")]
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ImageData(#[source] PangoError),
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}
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pub fn render(
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ctx: &Rc<RenderContext>,
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width: i32,
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height: i32,
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font: &str,
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text: &str,
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color: Color,
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) -> Result<Rc<Texture>, TextError> {
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let image = match CairoImageSurface::new_image_surface(CAIRO_FORMAT_ARGB32, width, height) {
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Ok(s) => s,
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Err(e) => return Err(TextError::CreateImage(e)),
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};
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let cctx = match image.create_context() {
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Ok(c) => c,
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Err(e) => return Err(TextError::CairoContext(e)),
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};
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let pctx = match cctx.create_pango_context() {
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Ok(c) => c,
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Err(e) => return Err(TextError::PangoContext(e)),
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};
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let fd = PangoFontDescription::from_string(font);
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let layout = match pctx.create_layout() {
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Ok(l) => l,
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Err(e) => return Err(TextError::CreateLayout(e)),
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};
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layout.set_width((width - 2).max(0) * PANGO_SCALE);
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layout.set_ellipsize(PANGO_ELLIPSIZE_END);
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layout.set_font_description(&fd);
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layout.set_text(text);
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let font_height = layout.pixel_size().1;
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cctx.set_operator(CAIRO_OPERATOR_SOURCE);
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cctx.set_source_rgba(color.r as _, color.g as _, color.b as _, color.a as _);
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cctx.move_to(1.0, ((height - font_height) / 2) as f64);
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layout.show_layout();
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image.flush();
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let data = match image.data() {
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Ok(d) => d,
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Err(e) => return Err(TextError::ImageData(e)),
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};
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match ctx.shmem_texture(data, ARGB8888, width, height, image.stride()) {
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Ok(t) => Ok(t),
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Err(e) => Err(TextError::RenderError(e)),
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}
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}
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