Fix a bunch of sign mismatch warnings.

core/src/fxcodec/codec/fx_codec_jpx_opj.cpp

Index: core/src/fxcodec/codec/fx_codec_jpx_opj.cpp
diff --git a/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp b/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp
index b7e032e61477d6b14d8fe140857ff7f62eedb89e..8a731c954e88bdd0e9bb40bbf1fb029af635deb6 100644
--- a/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp
+++ b/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp
@@ -615,7 +615,7 @@ class CJPX_Decoder {
  public:
   explicit CJPX_Decoder(bool use_colorspace);
   ~CJPX_Decoder();
-  FX_BOOL Init(const unsigned char* src_data, int src_size);
+  FX_BOOL Init(const unsigned char* src_data, FX_DWORD src_size);
   void GetInfo(FX_DWORD* width, FX_DWORD* height, FX_DWORD* components);
   FX_BOOL Decode(uint8_t* dest_buf,
                  int pitch,
@@ -623,7 +623,7 @@ class CJPX_Decoder {
 
  private:
   const uint8_t* m_SrcData;
-  int m_SrcSize;
+  FX_DWORD m_SrcSize;
   opj_image_t* image;
   opj_codec_t* l_codec;
   opj_stream_t* l_stream;
@@ -649,12 +649,12 @@ CJPX_Decoder::~CJPX_Decoder() {
   }
 }
 
-FX_BOOL CJPX_Decoder::Init(const unsigned char* src_data, int src_size) {
+FX_BOOL CJPX_Decoder::Init(const unsigned char* src_data, FX_DWORD src_size) {
   static const unsigned char szJP2Header[] = {
       0x00, 0x00, 0x00, 0x0c, 0x6a, 0x50, 0x20, 0x20, 0x0d, 0x0a, 0x87, 0x0a};
-  if (!src_data || src_size < sizeof(szJP2Header)) {
+  if (!src_data || src_size < sizeof(szJP2Header))
     return FALSE;
-  }
+
   image = NULL;
   m_SrcData = src_data;
   m_SrcSize = src_size;