src/java.desktop/windows/native/libsplashscreen/splashscreen_sys.c

*** 36,46 ****
  #include "splashscreen_impl.h"
  #include <windowsx.h>
  #include <windows.h>
  #include <winuser.h>
  #include "sizecalc.h"
- 
  #ifndef WS_EX_LAYERED
  #define WS_EX_LAYERED 0x80000
  #endif
  
  #ifndef ULW_ALPHA
--- 36,45 ----
*** 56,65 ****
--- 55,66 ----
  #endif
  
  #define WM_SPLASHUPDATE         WM_USER+1
  #define WM_SPLASHRECONFIGURE    WM_USER+2
  
+ #define BUFF_SIZE 1024
+ 
  /* Could use npt but decided to cut down on linked code size */
  char* SplashConvertStringAlloc(const char* in, int *size) {
      int len, outChars, rc;
      WCHAR* buf;
      if (!in) {
*** 571,578 ****
--- 572,630 ----
  
  SPLASHEXPORT char*
  SplashGetScaledImageName(const char* jarName, const char* fileName,
                             float *scaleFactor)
  {
+     float dpiScaleX = -1.0f;
+     float dpiScaleY = -1.0f;
+     *scaleFactor = 1.0;
+     GetScreenDpi(getPrimaryMonitor(), &dpiScaleX, &dpiScaleY);
+     *scaleFactor = dpiScaleX > 0 ? dpiScaleX / 96 : *scaleFactor;
+ 
+     if (*scaleFactor > 1.0) {
+         char strDpi[BUFF_SIZE];
+         _snprintf(strDpi, BUFF_SIZE, "%d", (int)dpiScaleX);
+         char *dupFileName = strdup(fileName);
+         char *fileExtension = strrchr(dupFileName, '.');
+         char *scaledImgName = NULL;
+         char *nameToAppend = ".scale-";
+         size_t length = 0;
+         /*File is missing extension */
+         if (fileExtension == NULL) {
+             length = strlen(dupFileName) + strlen(nameToAppend) +
+                 strlen(strDpi) + 1;
+             scaledImgName = SAFE_SIZE_ARRAY_ALLOC(malloc, length, sizeof(char));
+             int retVal = _snprintf(scaledImgName, length, "%s%s%s", dupFileName,
+                 nameToAppend, strDpi);
+             if (retVal < 0 || (retVal != length - 1)) {
+                 *scaleFactor = 1;
+                 free(dupFileName);
+                 free(scaledImgName);
+                 return NULL;
+             }
+         }
+         else {
+             size_t length_Without_Ext = fileExtension - dupFileName;
+             length = length_Without_Ext + strlen(nameToAppend) + strlen(strDpi) +
+                 strlen(fileExtension) + 1;
+             scaledImgName = SAFE_SIZE_ARRAY_ALLOC(malloc, length, sizeof(char));
+             int retVal = _snprintf(scaledImgName, length, "%.*s%s%s%s",
+                 length_Without_Ext, dupFileName, nameToAppend, strDpi, fileExtension);
+             if (retVal < 0 || (retVal != length - 1)) {
                  *scaleFactor = 1;
+                 free(dupFileName);
+                 free(scaledImgName);
+                 return NULL;
+             }
+         }
+         free(dupFileName);
+         FILE *fp = NULL;
+         if (!(fp = fopen(scaledImgName, "r"))) {
+             *scaleFactor = 1;
+             free(scaledImgName);
+             return NULL;
+         }
+         fclose(fp);
+         return scaledImgName;
+     }
      return NULL;
  }