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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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CMakeLists.txt
+5 -1
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@@ -15,6 +15,9 @@ set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG")
find_package(PkgConfig REQUIRED)
pkg_check_modules(GTKMM REQUIRED IMPORTED_TARGET gtkmm-4.0)
pkg_check_modules(GDKPIXBUF REQUIRED IMPORTED_TARGET gdk-pixbuf-2.0)
# Pango and Cairo draw the text effect's glyphs. Neither needs a display, so
# the core stays headless.
pkg_check_modules(PANGOCAIRO REQUIRED IMPORTED_TARGET pangocairo)
find_package(Threads REQUIRED)
@@ -32,11 +35,12 @@ add_library(effector_core STATIC
src/effects/monochrome.cpp
src/effects/overlay.cpp
src/effects/scanlines.cpp
src/effects/text.cpp
)
target_include_directories(effector_core PUBLIC src)
# The core is GUI-free: it only needs gdk-pixbuf for decoding and encoding,
# so headless rendering works without a display.
target_link_libraries(effector_core PUBLIC PkgConfig::GDKPIXBUF Threads::Threads)
target_link_libraries(effector_core PUBLIC PkgConfig::GDKPIXBUF PkgConfig::PANGOCAIRO Threads::Threads)
target_compile_options(effector_core PRIVATE -Wall -Wextra -Wpedantic)
# --- application --------------------------------------------------------------