ref: a0578c7de4163344d936ea78191a836556495bba
parent: 16db494271a75689ee7e6da9ff3d3d20f0a3fd2b
author: sirjofri <sirjofri@sirjofri.de>
date: Mon Mar 31 16:06:47 EDT 2025
adds forgotten img.c file
--- /dev/null
+++ b/img.c
@@ -1,0 +1,98 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <memdraw.h>
+#include "dat.h"
+#include "fns.h"
+
+extern Image *mapimage;
+extern int tilesize;
+extern Point drawoffset;
+
+ImageUpdated callbackfunc;
+
+void
+loadtile(GBundle b, Point pos)
+{+ Image *loaded;
+ int fd;
+ char file[32];
+ Rectangle r;
+
+ r = Rect(0, 0, 256, 256);
+
+ snprint(file, sizeof file, "/mnt/map/%d/%d/%d", b.z, b.x, b.y);
+ debugprint("loading file: %s\n", file);+
+ fd = open(file, OREAD);
+ if (fd < 0) {+ fprint(2, "unable to load tile %d/%d/%d: %r\n", b.z, b.x, b.y);
+ return;
+ }
+
+ loaded = readimage(display, fd, 0);
+ close(fd);
+
+ lockmapimage();
+ draw(mapimage, rectaddpt(r, pos), loaded, nil, ZP);
+ if (debug) {+ snprint(file, sizeof file, "%d / %d", b.x, b.y);
+ border(mapimage, rectaddpt(r, pos), 1, display->black, ZP);
+ string(mapimage, pos, display->black, ZP, font, file);
+ }
+ unlockmapimage();
+
+ freeimage(loaded);
+}
+
+static void
+collapsebundle(GBundle *b, int mod)
+{+ while (b->x < 0)
+ b->x += mod;
+ while (b->y < 0)
+ b->y += mod;
+
+ b->x = b->x % mod;
+ b->y = b->y % mod;
+}
+
+void
+requestimage(GBundle from, ImageUpdated cb)
+{+ GBundle b;
+ int numx, numy, mod;
+ b.z = from.z;
+ callbackfunc = cb;
+
+ mod = 1;
+ for (int i = 0; i < b.z; i++)
+ mod *= 2;
+
+ lockmapimage();
+ if (!mapimage) {+ unlockmapimage();
+ debugprint("cannot load tiles: no mapimage\n");+ return;
+ }
+ numx = Dx(mapimage->r)/tilesize + 1;
+ numy = Dy(mapimage->r)/tilesize + 1;
+ unlockmapimage();
+
+ debugprint("loading tiles from %d/%d\n", from.x, from.y);+
+ for (int x = 0; x < numx; x++) {+ for (int y = 0; y < numy; y++) {+ b.x = from.x + x;
+ b.y = from.y + y;
+ collapsebundle(&b, mod);
+ loadtile(b, Pt(
+ x * tilesize,
+ y * tilesize)
+ );
+ }
+ }
+
+ if (callbackfunc)
+ callbackfunc();
+}