Cull the examples folder

tool/viz/img.c

@@ -0,0 +1,107 @@
+#if 0
+/*─────────────────────────────────────────────────────────────────╗
+│ To the extent possible under law, Justine Tunney has waived      │
+│ all copyright and related or neighboring rights to this file,    │
+│ as it is written in the following disclaimers:                   │
+│   • http://unlicense.org/                                        │
+│   • http://creativecommons.org/publicdomain/zero/1.0/            │
+╚─────────────────────────────────────────────────────────────────*/
+#endif
+#include "libc/dce.h"
+#include "libc/errno.h"
+#include "libc/log/log.h"
+#include "libc/mem/gc.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+#include "libc/x/x.h"
+#include "libc/x/xasprintf.h"
+#include "net/http/escape.h"
+#include "net/http/http.h"
+#include "third_party/getopt/getopt.internal.h"
+#include "third_party/stb/stb_image.h"
+
+#define USAGE \
+  " [FLAGS] IMG...\n\
+Utility for printing HTML <img> tags.\n\
+\n\
+FLAGS\n\
+\n\
+  -h      Help\n\
+  -a      Wrap with <a> tag\n\
+  -u      Embed data:base64 URI\n"
+
+int scale;
+bool linktag;
+bool datauri;
+bool sizeonly;
+
+void PrintUsage(int rc, FILE *f) {
+  fputs("Usage: ", f);
+  fputs(program_invocation_name, f);
+  fputs(USAGE, f);
+  exit(rc);
+}
+
+void PrintImg(const char *path) {
+  size_t n;
+  int yn, xn, cn, w, h;
+  void *img, *pix, *src;
+  if (!(img = _gc(xslurp(path, &n)))) exit(2);
+  if (!(pix = _gc(stbi_load_from_memory(img, n, &xn, &yn, &cn, 0)))) exit(3);
+  if (linktag) {
+    printf("<a href=\"%s\"\n  >", path);
+  }
+  src = (void *)path;
+  if (datauri) {
+    src = xasprintf("data:%s;base64,%s", FindContentType(path, -1),
+                    _gc(EncodeBase64(img, n, &n)));
+  }
+  w = (xn + (1 << scale) / 2) >> scale;
+  h = (yn + (1 << scale) / 2) >> scale;
+  if (sizeonly) {
+    printf("width=\"%d\" height=\"%d\"", w, h);
+  } else {
+    printf("<img width=\"%d\" height=\"%d\" alt=\"[%s]\"\n     src=\"%s\">", w,
+           h, path, src);
+  }
+  if (linktag) {
+    printf("</a>");
+  }
+  printf("\n");
+}
+
+int main(int argc, char *argv[]) {
+  if (!NoDebug()) ShowCrashReports();
+  int i;
+  while ((i = getopt(argc, argv, "?huas01234")) != -1) {
+    switch (i) {
+      case '0':
+      case '1':
+      case '2':
+      case '3':
+      case '4':
+        scale = i - '0';
+        break;
+      case 's':
+        sizeonly = true;
+        break;
+      case 'a':
+        linktag = true;
+        break;
+      case 'u':
+        datauri = true;
+        break;
+      case '?':
+      case 'h':
+        PrintUsage(0, stdout);
+      default:
+        PrintUsage(1, stderr);
+    }
+  }
+  if (optind == argc) {
+    PrintUsage(1, stderr);
+  }
+  for (i = optind; i < argc; ++i) {
+    PrintImg(argv[i]);
+  }
+}