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Skip unchanged regions

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This commit is contained in:
Matthias Schiffer 2015-02-02 03:06:22 +01:00
parent 248b9e319d
commit 58adcc4c15
1 changed files with 32 additions and 1 deletions
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33
src/MinedMap.cpp
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@ -41,7 +41,11 @@
#include <arpa/inet.h>
#include <dirent.h>
#include <fcntl.h>
#include <png.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
using namespace MinedMap;
@ -96,11 +100,38 @@ static void writePNG(const char *filename, const uint32_t data[DIM][DIM]) {
}
static void doRegion(const std::string &input, const std::string &output) {
struct stat instat, outstat;
if (stat(input.c_str(), &instat) < 0) {
std::fprintf(stderr, "Unable to stat %s: %s\n", input.c_str(), std::strerror(errno));
return;
}
if (stat(output.c_str(), &outstat) == 0) {
if (instat.st_mtim.tv_sec < outstat.st_mtim.tv_sec ||
(instat.st_mtim.tv_sec == outstat.st_mtim.tv_sec && instat.st_mtim.tv_nsec <= outstat.st_mtim.tv_nsec)) {
std::fprintf(stderr, "%s is up-to-date.\n", output.c_str());
return;
}
}
std::fprintf(stderr, "Generating %s from %s...\n", output.c_str(), input.c_str());
const std::string tmpfile = output + ".tmp";
uint32_t image[DIM][DIM] = {};
World::Region::visitChunks(input.c_str(), [&image] (size_t X, size_t Z, const World::Chunk *chunk) { addChunk(image, X, Z, chunk); });
writePNG(output.c_str(), image);
writePNG(tmpfile.c_str(), image);
struct timespec times[2] = {instat.st_mtim, instat.st_mtim};
if (utimensat(AT_FDCWD, tmpfile.c_str(), times, 0) < 0)
std::fprintf(stderr, "Warning: failed to set utime on %s: %s\n", tmpfile.c_str(), std::strerror(errno));
if (std::rename(tmpfile.c_str(), output.c_str()) < 0) {
std::fprintf(stderr, "Unable to save %s: %s\n", output.c_str(), std::strerror(errno));
unlink(tmpfile.c_str());
}
}
int main(int argc, char *argv[]) {