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

@@ -36,11 +36,10 @@
 #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

@@ -56,10 +55,12 @@
 #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) {

@@ -571,8 +572,59 @@
 
 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;
 }