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/*
* wallpaper-gen.c - Zygaena marine-dark wallpaper generator.
*
* Renders a 1920x1080 PNG: deep-ocean vertical gradient, low-alpha
* concentric sonar arcs from a lower-left origin, a low-alpha stylized
* hammerhead-shark silhouette, and the HAMMERHEAD/ZYGAENA wordmark in
* the lower-right corner.
*
* Build: gcc wallpaper-gen.c $(pkg-config --cflags --libs cairo) -lm -o wg
* Usage: ./wg /path/to/output.png
*/
#include <cairo.h>
#include <math.h>
#include <stdio.h>
#define W 1920
#define H 1080
/* Zygaena marine-dark palette */
#define BG_TOP_R 0x05/255.0
#define BG_TOP_G 0x08/255.0
#define BG_TOP_B 0x0d/255.0
#define BG_BOT_R 0x0a/255.0
#define BG_BOT_G 0x27/255.0
#define BG_BOT_B 0x33/255.0
#define TEAL_R 0x1f/255.0
#define TEAL_G 0xb6/255.0
#define TEAL_B 0xb6/255.0
#define TEAL_BR_R 0x3f/255.0
#define TEAL_BR_G 0xd0/255.0
#define TEAL_BR_B 0xd0/255.0
#define MUTED_R 0x5a/255.0
#define MUTED_G 0x75/255.0
#define MUTED_B 0x75/255.0
static void
draw_background(cairo_t *cr)
{
cairo_pattern_t *grad = cairo_pattern_create_linear(0, 0, 0, H);
cairo_pattern_add_color_stop_rgb(grad, 0.0, BG_TOP_R, BG_TOP_G, BG_TOP_B);
cairo_pattern_add_color_stop_rgb(grad, 1.0, BG_BOT_R, BG_BOT_G, BG_BOT_B);
cairo_set_source(cr, grad);
cairo_paint(cr);
cairo_pattern_destroy(grad);
}
static void
draw_sonar_arcs(cairo_t *cr)
{
/* Origin lower-left, off canvas a bit so rings sweep across the
* bottom-left quadrant. */
double cx = -80, cy = H + 80;
int rings = 5;
double base_r = 260;
double step_r = 220;
for (int i = 0; i < rings; i++) {
double alpha = 0.12 - (i * (0.06 / (rings - 1)));
if (alpha < 0.06) alpha = 0.06;
cairo_set_source_rgba(cr, TEAL_R, TEAL_G, TEAL_B, alpha);
cairo_set_line_width(cr, 2.0);
cairo_arc(cr, cx, cy, base_r + i * step_r, -M_PI / 2.2, 0.15);
cairo_stroke(cr);
}
}
/*
* Stylized hammerhead-shark silhouette: a wide flattened "hammer" head
* bar with an eye-dot at each end, a tapering dorsal body, and a
* crescent tail - all in one low-alpha teal fill, large and off-center
* (upper-left-of-center so it doesn't collide with the wordmark).
*/
static void
draw_hammerhead_motif(cairo_t *cr)
{
double ox = 560, oy = 430; /* motif origin (center of the head bar) */
double scale = 1.55;
cairo_save(cr);
cairo_translate(cr, ox, oy);
cairo_scale(cr, scale, scale);
cairo_set_source_rgba(cr, TEAL_R, TEAL_G, TEAL_B, 0.10);
/* Hammer head: a wide, slightly bowed bar. */
cairo_move_to(cr, -260, 0);
cairo_curve_to(cr, -180, -34, 180, -34, 260, 0);
cairo_curve_to(cr, 180, 34, -180, 34, -260, 0);
cairo_close_path(cr);
cairo_fill(cr);
/* Tapering body/tail sweeping down-right from the head's center. */
cairo_move_to(cr, -40, 18);
cairo_curve_to(cr, 120, 60, 260, 160, 360, 340);
cairo_curve_to(cr, 380, 380, 340, 400, 300, 380);
cairo_curve_to(cr, 220, 220, 90, 100, -40, 54);
cairo_close_path(cr);
cairo_fill(cr);
/* Tail fluke. */
cairo_move_to(cr, 340, 320);
cairo_curve_to(cr, 400, 330, 440, 300, 470, 250);
cairo_curve_to(cr, 450, 310, 420, 360, 380, 400);
cairo_curve_to(cr, 360, 370, 345, 345, 340, 320);
cairo_close_path(cr);
cairo_fill(cr);
/* Eye-dots at each end of the hammer bar. */
cairo_arc(cr, -235, 0, 10, 0, 2 * M_PI);
cairo_fill(cr);
cairo_arc(cr, 235, 0, 10, 0, 2 * M_PI);
cairo_fill(cr);
cairo_restore(cr);
}
/* Draw text with manual letter-spacing (cairo toy text API has no
* built-in tracking control). */
static void
draw_tracked_text(cairo_t *cr, const char *s, double x, double y, double tracking)
{
cairo_text_extents_t ext;
double cx = x;
char buf[2] = {0, 0};
for (const char *p = s; *p; p++) {
buf[0] = *p;
cairo_text_extents(cr, buf, &ext);
cairo_move_to(cr, cx, y);
cairo_show_text(cr, buf);
cx += ext.x_advance + tracking;
}
}
static void
draw_wordmark(cairo_t *cr)
{
cairo_text_extents_t ext;
cairo_select_font_face(cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size(cr, 64);
cairo_set_source_rgb(cr, TEAL_R, TEAL_G, TEAL_B);
/* Measure full tracked width to right-align at x = W - 120. */
const char *word = "HAMMERHEAD";
double tracking = 8.0;
double total_w = 0;
char buf[2] = {0, 0};
for (const char *p = word; *p; p++) {
buf[0] = *p;
cairo_text_extents(cr, buf, &ext);
total_w += ext.x_advance + tracking;
}
total_w -= tracking;
double x = W - 120 - total_w;
double y = H - 150;
draw_tracked_text(cr, word, x, y, tracking);
/* Subtitle */
cairo_select_font_face(cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size(cr, 22);
cairo_set_source_rgb(cr, MUTED_R, MUTED_G, MUTED_B);
const char *sub = "ZYGAENA";
double sub_tracking = 6.0;
double sub_w = 0;
for (const char *p = sub; *p; p++) {
buf[0] = *p;
cairo_text_extents(cr, buf, &ext);
sub_w += ext.x_advance + sub_tracking;
}
sub_w -= sub_tracking;
draw_tracked_text(cr, sub, W - 120 - sub_w, y + 40, sub_tracking);
}
int
main(int argc, char **argv)
{
const char *outpath = (argc > 1) ? argv[1] : "/tmp/hammerhead.png";
cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, W, H);
cairo_t *cr = cairo_create(surface);
draw_background(cr);
draw_sonar_arcs(cr);
draw_hammerhead_motif(cr);
draw_wordmark(cr);
cairo_status_t st = cairo_surface_write_to_png(surface, outpath);
if (st != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "write_to_png failed: %s\n", cairo_status_to_string(st));
cairo_destroy(cr);
cairo_surface_destroy(surface);
return 1;
}
printf("wrote %s (%dx%d)\n", outpath, W, H);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return 0;
}
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