SiandClaude Opus 5
1d0343b90a
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>
50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
#pragma once
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#include <cstdint>
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#include <mutex>
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#include <string>
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#include <vector>
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#include "core/effect.hpp"
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namespace effector {
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// Writes a line (or several) over its input: a title, a caption, a watermark.
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// The family and the weight are chosen freely, and the text can sit on a box
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// filled with a colour or with a picture from disk. Like the blur and the
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// overlay it needs no source images of its own, so it can lead a chain; given
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// sources it fills the canvas from a randomly chosen one first.
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//
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// The glyphs come from Pango, so the exact pixels depend on the fonts the
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// machine has installed: a seed reproduces everything this effect draws, but a
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// machine without the chosen family renders the substitute its fontconfig
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// picks.
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class TextEffect : public Effect {
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public:
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std::string name() const override { return "text"; }
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std::string title() const override { return "Text"; }
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std::string description() const override {
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return "Writes text over its input in a chosen family, weight and size, optionally on a "
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"box filled with a colour or with a picture.";
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}
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const std::vector<ParamSpec>& params() const override;
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bool needsSources() const override { return false; }
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Image render(const std::vector<Image>& sources, int width, int height, Rng& rng,
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const ParamValues& values) const override;
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private:
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// The box picture is re-read on every param change otherwise, and a render
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// is a keystroke away in the interface. Renders can overlap, so it is
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// guarded.
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void loadBoxImage(const std::string& path, Image& image,
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std::vector<std::uint8_t>& alpha) const;
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mutable std::mutex cacheMutex_;
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mutable std::string cachedPath_;
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mutable Image cached_;
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mutable std::vector<std::uint8_t> cachedAlpha_;
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};
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} // namespace effector
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