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Add a text effect

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Writes a line or several over its input in a chosen family, weight, size
and colour, optionally on a box filled with a colour or with a picture
from disk. Like the blur and the overlay it needs no sources of its own,
so it can lead a chain; given sources it fills the canvas from a randomly
chosen one first.

Two param types rather than effect-specific branches in the front-ends:
Text, free-form text the user types, and Color, a colour written
"#rrggbb". Both travel as strings, so the interface gets an entry and a
colour button, the command line gets a flag (a colour that does not parse
is refused there rather than drawn as black), and a project keeps them
across a round trip.

The glyphs come from Pango, which draws through Cairo without a display,
so the core stays headless — but they are the one thing here that is not
byte-identical across machines: a machine without the chosen family
renders the substitute its fontconfig picks. Everything the effect is
handed, the rng included, is used exactly as every other effect uses it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Si
2026-09-18 20:31:24 +02:00
co-authored by Claude Opus 5
parent c34bc426fc
commit 1d0343b90a
12 changed files with 725 additions and 6 deletions
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src/gui/window.cpp
+40
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@@ -2,6 +2,8 @@
#include <algorithm>
#include <chrono>
#include <cmath>
#include <cstdint>
#include <filesystem>
#include <sstream>
@@ -315,6 +317,34 @@ void EffectorWindow::buildParamWidgets() {
widget = std::move(box);
break;
}
case ParamSpec::Type::Text: {
auto entry = std::make_unique<Gtk::Entry>();
entry->set_text(paramText(stage.values, spec.key, spec.defaultChoice));
// Re-rendering on every keystroke would start a render per
// letter typed, so the text is taken when the entry is left or
// Enter is pressed.
entry->signal_activate().connect(
sigc::mem_fun(*this, &EffectorWindow::onParamChanged));
auto focus = Gtk::EventControllerFocus::create();
focus->signal_leave().connect(
sigc::mem_fun(*this, &EffectorWindow::onParamChanged));
entry->add_controller(focus);
widget = std::move(entry);
break;
}
case ParamSpec::Type::Color: {
auto button = std::make_unique<Gtk::ColorDialogButton>(Gtk::ColorDialog::create());
button->set_halign(Gtk::Align::START);
std::uint8_t rgb[3];
paramColor(stage.values, spec.key, spec.defaultChoice, rgb);
Gdk::RGBA colour;
colour.set_rgba(rgb[0] / 255.0, rgb[1] / 255.0, rgb[2] / 255.0, 1.0);
button->set_rgba(colour);
button->property_rgba().signal_changed().connect(
sigc::mem_fun(*this, &EffectorWindow::onParamChanged));
widget = std::move(button);
break;
}
case ParamSpec::Type::Choice: {
std::vector<Glib::ustring> choices(spec.choices.begin(), spec.choices.end());
auto dropdown = std::make_unique<Gtk::DropDown>();
@@ -358,9 +388,19 @@ ParamValues EffectorWindow::paramValues() const {
values[entry.spec.key] = static_cast<Gtk::SpinButton*>(entry.widget)->get_value();
break;
case ParamSpec::Type::Path:
case ParamSpec::Type::Text:
values[entry.spec.key] =
std::string(static_cast<Gtk::Entry*>(entry.widget)->get_text());
break;
case ParamSpec::Type::Color: {
const auto colour = static_cast<Gtk::ColorDialogButton*>(entry.widget)->get_rgba();
const std::uint8_t rgb[3] = {
static_cast<std::uint8_t>(std::lround(colour.get_red() * 255.0)),
static_cast<std::uint8_t>(std::lround(colour.get_green() * 255.0)),
static_cast<std::uint8_t>(std::lround(colour.get_blue() * 255.0))};
values[entry.spec.key] = formatColor(rgb);
break;
}
case ParamSpec::Type::Choice: {
const auto index = static_cast<Gtk::DropDown*>(entry.widget)->get_selected();
if (index < entry.spec.choices.size()) values[entry.spec.key] = entry.spec.choices[index];