grd.c - Proportional Grid Layout Engine

grd.c is a minimalist C library and CLI for computing proportional grid splits. It provides a passive layout engine for hierarchical boxes and splits, designed as a composable native primitive for the KaisarCode ecosystem.

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CLI

Compute proportional splits for a given root area and set of weights.

Examples

Split a 1920x1080 area into three rows with 1:2:1 proportions:

./bin/x86_64/linux/grd split -w 1920 -H 1080 -k row -W "1 2 1"

Split an 800x600 area into four equal columns with a 4px gap:

./bin/x86_64/linux/grd split -w 800 -H 600 -k col -W "1 1 1 1" -g 4

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Parameters

Flag	Description
-w <n>	Root width in pixels (required)
-H <n>	Root height in pixels (required)
-k row|col	Split direction (default: row)
-W <weights>	Space or comma separated weights (required)
-g <n>	Gap between children in pixels (default: 0)
-m <n>	Minimum child size in pixels (default: 1)
-h, --help	Show help and usage
-v, --version	Show version

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Output

One line per child box, in the format index x y w h:

0 0 0 1920 270
1 0 270 1920 540
2 0 810 1920 270

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Public API

#include "grd.h"

kc_grd_box_t *root = kc_grd_box_new();
kc_grd_split_t *s = kc_grd_split_set(root, KC_GRD_ROW);

kc_grd_split_add(s, kc_grd_box_new(), 1.0f);
kc_grd_split_add(s, kc_grd_box_new(), 2.0f);

kc_grd_box_bounds(root, 0, 0, 1920, 1080);
kc_grd_box_layout(root);

kc_grd_box_free(root);

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Lifecycle

• kc_grd_box_new() - allocates a new box. The caller owns the box until it is added to a split.
• kc_grd_split_set() - attaches a split engine to a box.
• kc_grd_split_add() - adds a child box to a split. Ownership of the child transfers to the parent box.
• kc_grd_box_free() - recursively releases a box and all its descendants.

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Build

Compiled artifacts are generated under bin/{arch}/{platform}/ for the host architecture running the build.

make clean && make

Multiarch Builds

The project is prepared to build artifacts for multiple architectures under bin/{arch}/{platform}/. A plain make builds only the current host architecture, while the targets below build the full matrix or a specific target.

make all
make x86_64/linux
make x86_64/windows
make i686/linux
make i686/windows
make aarch64/linux
make aarch64/android
make armv7/linux
make armv7/android
make armv7hf/linux
make riscv64/linux
make powerpc64le/linux
make mips/linux
make mipsel/linux
make mips64el/linux
make s390x/linux
make loongarch64/linux

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License

This project is distributed under the GNU General Public License version 3 (GPLv3).