From 2a6facd255c726eeac561d358fd53e37f27a9b84 Mon Sep 17 00:00:00 2001
From: Javier Celaya <jcelaya@gmail.com>
Date: Sat, 17 May 2014 18:30:54 +0100
Subject: [PATCH] US38: Small improvement saving the DNG file

---
 DngFloatWriter.cpp | 11 +++++++----
 Log.hpp            |  8 +++++---
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/DngFloatWriter.cpp b/DngFloatWriter.cpp
index f19996a..38dd2e9 100644
--- a/DngFloatWriter.cpp
+++ b/DngFloatWriter.cpp
@@ -121,8 +121,9 @@ void DngFloatWriter::write(const string & filename) {
     file.seekp(dataOffset);
 
     progress.advance(75, "Writing output");
+    Timer t("Write output");
     writePreviews();
-    writeRawData();
+    measureTime("Write raw", [&] () { writeRawData(); });
     file.seekp(0);
     TiffHeader().write(file);
     mainIFD.write(file, false);
@@ -490,8 +491,8 @@ void DngFloatWriter::writeRawData() {
     size_t tileCount = tilesAcross * tilesDown;
     uint32_t tileOffsets[tileCount];
     uint32_t tileBytes[tileCount];
-    uLongf dstLen = tileWidth * tileLength * 4;
     int bytesps = bps >> 3;
+    uLongf dstLen = tileWidth * tileLength * bytesps;
 
 //     #pragma omp parallel
     {
@@ -502,9 +503,11 @@ void DngFloatWriter::writeRawData() {
         for (size_t y = 0; y < height; y += tileLength) {
             for (size_t x = 0; x < width; x += tileWidth) {
                 size_t t = (y / tileLength) * tilesAcross + (x / tileWidth);
-                fill_n(uBuffer, dstLen, 0);
                 size_t thisTileLength = y + tileLength > height ? height - y : tileLength;
                 size_t thisTileWidth = x + tileWidth > width ? width - x : tileWidth;
+                if (thisTileLength != tileLength || thisTileWidth != tileWidth) {
+                    fill_n(uBuffer, dstLen, 0);
+                }
                 for (size_t row = 0; row < thisTileLength; ++row) {
                     Bytef * dst = uBuffer + row*tileWidth*bytesps;
                     Bytef * src = (Bytef *)&rawData[(y+row)*width + x];
@@ -516,7 +519,7 @@ void DngFloatWriter::writeRawData() {
                 tileBytes[t] = conpressedLength;
                 if (err != Z_OK) {
                     std::cerr << "DNG Deflate: Failed compressing tile " << t << ", with error " << err << std::endl;
-                } else {  // Floating point data
+                } else {
 //                     #pragma omp critical
                     {
                         tileOffsets[t] = file.tellp();
diff --git a/Log.hpp b/Log.hpp
index b62c0a1..48b00e9 100644
--- a/Log.hpp
+++ b/Log.hpp
@@ -82,15 +82,17 @@ inline std::ostream & operator<<(std::ostream & os, const QString & s) {
 class Timer {
 public:
     Timer(const char * n) : name(n) {
-        start = std::clock();
+        clock_gettime(CLOCK_MONOTONIC_COARSE, &start);
     }
     ~Timer() {
-        double t = (std::clock() - start) / (double) CLOCKS_PER_SEC;
+        timespec end;
+        clock_gettime(CLOCK_MONOTONIC_COARSE, &end);
+        double t = end.tv_sec - start.tv_sec + (end.tv_nsec - start.tv_nsec)/1000000000.0;
         Log::msg(Log::DEBUG, name, ": ", t, " seconds");
     }
 
 private:
-    std::clock_t start;
+    timespec start;
     const char * name;
 };