jpg_loader: fix compiler warnings.

"warning: shifting a negative signed value is undefined [-Wshift-negative-value"

diff --git a/src/loaders/jpg/tvgJpgd.cpp b/src/loaders/jpg/tvgJpgd.cpp
index 1594b14..fa72734 100644 (file)
--- a/src/loaders/jpg/tvgJpgd.cpp
+++ b/src/loaders/jpg/tvgJpgd.cpp
@@ -808,7 +808,7 @@ inline int jpeg_decoder::huff_decode(huff_tables *pH, int& extra_bits)
 
 // Tables and macro used to fully decode the DPCM differences.
 static const int s_extend_test[16] = { 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080, 0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
-static const int s_extend_offset[16] = { 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1, ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1, ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1, ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 };
+static const unsigned int s_extend_offset[16] = { 0, ((-1u)<<1) + 1, ((-1u)<<2) + 1, ((-1u)<<3) + 1, ((-1u)<<4) + 1, ((-1u)<<5) + 1, ((-1u)<<6) + 1, ((-1u)<<7) + 1, ((-1u)<<8) + 1, ((-1u)<<9) + 1, ((-1u)<<10) + 1, ((-1u)<<11) + 1, ((-1u)<<12) + 1, ((-1u)<<13) + 1, ((-1u)<<14) + 1, ((-1u)<<15) + 1 };
 
 // The logical AND's in this macro are to shut up static code analysis (aren't really necessary - couldn't find another way to do this)
 #define JPGD_HUFF_EXTEND(x, s) (((x) < s_extend_test[s & 15]) ? ((x) + s_extend_offset[s & 15]) : (x))