build question overlay svg
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7b1681d85d
commit
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6 changed files with 184 additions and 5 deletions
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@ -11,6 +11,8 @@ license = "EPL-2.0"
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anyhow = "1.0"
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camino = "1.1"
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clap = { version = "4.4", features = ["derive"] }
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fontconfig = "0.8"
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harfbuzz_rs = "2.0"
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indexmap = "2.2"
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rational = "1.5"
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serde = { version = "1.0.188", features = ["derive"] }
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BIN
question.png
Normal file
BIN
question.png
Normal file
Binary file not shown.
After Width: | Height: | Size: 104 KiB |
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@ -7,7 +7,7 @@ use std::{
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str::FromStr
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};
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use svgwriter::{
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tags::{Group, Rect, TagWithPresentationAttributes, Text},
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tags::{Group, Rect, TagWithPresentationAttributes as _, Text},
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Graphic
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};
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@ -134,14 +134,14 @@ impl Debug for Language<'_> {
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}
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#[repr(u16)]
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enum FontSize {
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pub(crate) enum FontSize {
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Huge = 72,
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Large = 56,
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Big = 44
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}
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#[repr(u16)]
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enum FontWeight {
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pub(crate) enum FontWeight {
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Normal = 400,
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SemiBold = 500,
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Bold = 700
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@ -3,16 +3,18 @@
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#![forbid(elided_lifetimes_in_paths, unsafe_code)]
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mod iotro;
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mod question;
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mod render;
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mod time;
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use crate::{
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use self::{
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iotro::Language,
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question::Question,
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render::{ffmpeg::FfmpegOutputFormat, Renderer},
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time::{parse_date, parse_time, Date, Time}
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};
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use camino::Utf8PathBuf as PathBuf;
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use clap::Parser;
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use iotro::Language;
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use rational::Rational;
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use serde::{Deserialize, Serialize};
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use serde_with::{serde_as, DisplayFromStr};
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160
src/question.rs
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160
src/question.rs
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@ -0,0 +1,160 @@
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use crate::{iotro::Language, Resolution};
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use fontconfig::Fontconfig;
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use harfbuzz_rs::{Face, Font, Owned, UnicodeBuffer};
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use std::sync::OnceLock;
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use svgwriter::{
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tags::{Group, Path, Rect, TSpan, TagWithPresentationAttributes as _, Text},
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Data, Graphic, Transform
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};
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pub(crate) struct Question {
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res: Resolution,
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g: Group
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}
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impl Question {
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pub(crate) fn new(res: Resolution, lang: &Language<'_>, str: String) -> Self {
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static FONT: OnceLock<Owned<Font<'static>>> = OnceLock::new();
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let font = FONT.get_or_init(|| {
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let fc = Fontconfig::new().unwrap();
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let font_path = fc.find("Noto Sans", None).unwrap().path;
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let face = Face::from_file(font_path, 0).unwrap();
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Font::new(face)
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});
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let upem = font.face().upem();
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// constants
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let border_r = 12;
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let font_size = 44;
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let line_height = font_size * 6 / 5;
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let padding = font_size / 2;
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let margin_x = 240;
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let margin_y = padding * 3 /2;
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let question_offset = 64;
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let question_width = 240;
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// calculated
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let box_width = 1920 - 2 * margin_x;
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let text_width = box_width - 2 * padding;
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// calculates the width of the given string
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let width_of = |s: &str| {
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let width: i32 =
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harfbuzz_rs::shape(font, UnicodeBuffer::new().add_str(s), &[])
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.get_glyph_positions()
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.iter()
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.map(|glyph_pos| glyph_pos.x_advance)
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.sum();
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(width * font_size) / upem as i32
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};
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let space_width = width_of(" ");
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// lay out the text
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let mut text = Text::new()
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.with_dominant_baseline("hanging")
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.with_transform(
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Transform::new().translate(padding, padding + font_size / 2 + border_r)
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);
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let words = str.split_whitespace();
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let mut text_height = 0;
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let mut text_x = 0;
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for word in words {
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let word_width = width_of(word);
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if text_x + word_width > text_width {
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text_x = 0;
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text_height += line_height;
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}
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text.push(
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TSpan::new()
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.with_x(text_x)
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.with_y(text_height)
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.append(word.to_owned())
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);
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text_x += word_width + space_width;
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}
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text_height += font_size;
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// calculated
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let box_height = text_height + 2 * padding + font_size / 2 + border_r;
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let mut g = Group::new()
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.with_fill("white")
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.with_font_family("Noto Sans")
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.with_font_size(font_size)
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.with_transform(
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Transform::new().translate(margin_x, 1080 - margin_y - box_height)
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);
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let mut outline = Data::new();
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outline.move_by(border_r, 0).horiz_line_to(question_offset);
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outline
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.vert_line_by(-font_size / 2)
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.arc_by(border_r, border_r, 0, false, true, border_r, -border_r)
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.horiz_line_by(question_width)
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.arc_by(border_r, border_r, 0, false, true, border_r, border_r)
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.vert_line_by(font_size)
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.arc_by(border_r, border_r, 0, false, true, -border_r, border_r)
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.horiz_line_by(-question_width)
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.arc_by(border_r, border_r, 0, false, true, -border_r, -border_r)
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.vert_line_by(-font_size / 2)
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.move_by(question_width + 2 * border_r, 0);
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outline
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.horiz_line_to(box_width - border_r)
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.arc_by(border_r, border_r, 0, false, true, border_r, border_r)
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.vert_line_by(box_height - 2 * border_r)
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.arc_by(border_r, border_r, 0, false, true, -border_r, border_r)
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.horiz_line_to(border_r)
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.arc_by(border_r, border_r, 0, false, true, -border_r, -border_r)
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.vert_line_to(border_r)
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.arc_by(border_r, border_r, 0, false, true, border_r, -border_r);
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g.push(
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Path::new()
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.with_stroke("#fff")
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.with_stroke_width(3)
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.with_fill("#000")
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.with_fill_opacity(".3")
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.with_d(outline)
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);
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g.push(
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Text::new()
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.with_x(question_offset + question_width / 2 + border_r)
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.with_y(0)
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.with_dominant_baseline("middle")
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.with_text_anchor("middle")
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.with_font_weight(600)
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.append("Question")
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);
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g.push(text);
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Self { res, g }
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}
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pub(crate) fn finish(self) -> Graphic {
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let mut svg = Graphic::new();
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svg.set_width(self.res.width());
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svg.set_height(self.res.height());
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svg.set_view_box("0 0 1920 1080");
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svg.push(
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Rect::new()
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.with_fill("#040")
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.with_x(0)
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.with_y(0)
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.with_width(1920)
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.with_height(1080)
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);
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svg.push(self.g);
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svg
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}
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}
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#[cfg(test)]
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#[test]
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fn question() {
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let svg = Question::new(
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Resolution::FullHD,
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&Language::default(),
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"Hallo Welt! Dies ist eine sehr kluge Frage aus dem Publikum. Die Frage ist nämlich: Was ist eigentlich die Frage?".into()
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)
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.finish();
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std::fs::write("question.svg", svg.to_string_pretty()).unwrap();
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}
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15
tmp.sh
Executable file
15
tmp.sh
Executable file
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@ -0,0 +1,15 @@
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#!/bin/busybox ash
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set -euo pipefail
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rm tmp.mkv || true
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ffmpeg -hide_banner \
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-loop 1 -r 25 -t 4 -i question.png \
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-filter_complex "
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gradients=s=2560x1440:d=4:c0=#000055:c1=#005500:x0=480:y0=540:x1=1440:y1=540[input];
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[0]fade=t=in:st=0:d=1:alpha=1,fade=t=out:st=3:d=1:alpha=1[overlay];
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[input][overlay]overlay=eval=frame:x=0:y=0[v]
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" \
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-map "[v]" \
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-c:v libsvtav1 -preset 1 -crf 18 \
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"tmp.mkv"
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