Function buildPngBinPath

src/core/display.cpp:1798–1809

Build a cache path alongside the PNG: /tmp/ .bin

// Build a cache path alongside the PNG: <dir>/tmp/<basename>.bin
static String buildPngBinPath(const String &pngPath) {
    int slash = pngPath.lastIndexOf('/');
    String dir = (slash >= 0) ? pngPath.substring(0, slash) : "";
    String name = pngPath.substring(slash + 1);
    int dot = name.lastIndexOf('.');
    if (dot > 0) name = name.substring(0, dot);

    String tmpDir = dir.length() ? dir + "/tmp" : "/tmp";
    if (!tmpDir.startsWith("/")) tmpDir = "/" + tmpDir;

    return tmpDir + "/" + name + ".bin";
}

static bool ensureTmpDir(FS &fs, const String &binPath) {
    int slash = binPath.lastIndexOf('/');