JPG loader: print error string on failure

Added error string printing on jpg image loading failure.
The error message help developer find the corrupted jpg file.
Error message is not printed for open from char* data as there the
loaders are tried on by one.

diff --git a/src/loaders/jpg/tvgJpgLoader.cpp b/src/loaders/jpg/tvgJpgLoader.cpp
index f08e063..f3327fb 100644 (file)
--- a/src/loaders/jpg/tvgJpgLoader.cpp
+++ b/src/loaders/jpg/tvgJpgLoader.cpp
@@ -77,7 +77,10 @@ bool JpgLoader::open(const string& path)
     if (fread(data, size, 1, jpegFile) < 1) goto failure;
 
     int width, height, subSample, colorSpace;
-    if (tjDecompressHeader3(jpegDecompressor, data, size, &width, &height, &subSample, &colorSpace) < 0) goto failure;
+    if (tjDecompressHeader3(jpegDecompressor, data, size, &width, &height, &subSample, &colorSpace) < 0) {
+        TVGERR("JPG LOADER", "%s", tjGetErrorStr());
+        goto failure;
+    }
 
     w = static_cast<float>(width);
     h = static_cast<float>(height);
@@ -127,6 +130,7 @@ bool JpgLoader::read()
 
     //decompress jpg image
     if (tjDecompress2(jpegDecompressor, data, size, image, static_cast<int>(w), 0, static_cast<int>(h), TJPF_BGRX, 0) < 0) {
+        TVGERR("JPG LOADER", "%s", tjGetErrorStr());
         tjFree(image);
         image = nullptr;
         return false;