Dispose SKBitmap after Encode calls

src/PDFtoImage/Conversion.cs

@@ -539,7 +539,8 @@ internal static void SaveImpl(Stream imageStream, SKEncodedImageFormat format, s
             if (imageStream == null)
                 throw new ArgumentNullException(nameof(imageStream));
 
-            ToImage(pdfAsBase64String, password, page, dpi, width, height, withAnnotations, withFormFill, withAspectRatio, rotation, antiAliasing, backgroundColor).Encode(imageStream, format, 100);
+            using var bitmap = ToImage(pdfAsBase64String, password, page, dpi, width, height, withAnnotations, withFormFill, withAspectRatio, rotation, antiAliasing, backgroundColor);
+            bitmap.Encode(imageStream, format, 100);
         }
 
 #if NET6_0_OR_GREATER
@@ -568,7 +569,8 @@ internal static void SaveImpl(Stream imageStream, SKEncodedImageFormat format, b
             if (imageStream == null)
                 throw new ArgumentNullException(nameof(imageStream));
 
-            ToImage(pdfAsByteArray, password, page, dpi, width, height, withAnnotations, withFormFill, withAspectRatio, rotation, antiAliasing, backgroundColor).Encode(imageStream, format, 100);
+            using var bitmap = ToImage(pdfAsByteArray, password, page, dpi, width, height, withAnnotations, withFormFill, withAspectRatio, rotation, antiAliasing, backgroundColor);
+            bitmap.Encode(imageStream, format, 100);
         }
 
 #if NET6_0_OR_GREATER
@@ -591,7 +593,8 @@ internal static void SaveImpl(string filename, SKEncodedImageFormat format, Stre
 #endif
         internal static void SaveImpl(Stream stream, SKEncodedImageFormat format, Stream pdfStream, string? password = null, int page = 0, int dpi = 300, int? width = null, int? height = null, bool withAnnotations = false, bool withFormFill = false, bool withAspectRatio = false, PdfRotation rotation = PdfRotation.Rotate0, PdfAntiAliasing antiAliasing = PdfAntiAliasing.All, SKColor? backgroundColor = null)
         {
-            ToImage(pdfStream, password, page, dpi, width, height, withAnnotations, withFormFill, withAspectRatio, rotation, antiAliasing, backgroundColor).Encode(stream, format, 100);
+            using var bitmap = ToImage(pdfStream, password, page, dpi, width, height, withAnnotations, withFormFill, withAspectRatio, rotation, antiAliasing, backgroundColor);
+            bitmap.Encode(stream, format, 100);
         }
         #endregion
 

src/PDFtoImage/PdfiumViewer/NativeMethods.Pdfium.cs

@@ -194,11 +194,11 @@ public static int FPDF_GetPageSizeByIndex(IntPtr document, int page_index, out d
             }
         }
 
-        public static IntPtr FPDFBitmap_CreateEx(int width, int height, int format, IntPtr first_scan, int stride)
+        public static IntPtr FPDFBitmap_CreateEx(int width, int height, FPDFBitmap format, IntPtr first_scan, int stride)
         {
             lock (LockString)
             {
-                return Imports.FPDFBitmap_CreateEx(width, height, format, first_scan, stride);
+                return Imports.FPDFBitmap_CreateEx(width, height, (int)format, first_scan, stride);
             }
         }
 
@@ -653,6 +653,32 @@ public enum FPDFPAGE_AACTION
             CLOSE = 1
         }
 
+        /// <summary>
+        /// A number indicating for bitmap format.
+        /// </summary>
+        public enum FPDFBitmap : int
+        {
+            /// <summary>
+            /// Gray scale bitmap, one byte per pixel.
+            /// </summary>
+            Gray = 1,
+
+            /// <summary>
+            /// 3 bytes per pixel, byte order: blue, green, red.
+            /// </summary>
+            BGR = 2,
+
+            /// <summary>
+            /// 4 bytes per pixel, byte order: blue, green, red, unused.
+            /// </summary>
+            BGRx = 3,
+
+            /// <summary>
+            /// 4 bytes per pixel, byte order: blue, green, red, alpha.
+            /// </summary>
+            BGRA = 4
+        }
+
         [Flags]
         public enum FPDF
         {

src/PDFtoImage/PdfiumViewer/PdfDocument.cs

@@ -79,7 +79,7 @@ public SKBitmap Render(int page, int width, int height, float dpiX, float dpiY,
             }
 
             var bitmap = new SKBitmap(width, height, SKColorType.Bgra8888, SKAlphaType.Premul);
-            var handle = NativeMethods.FPDFBitmap_CreateEx(width, height, 4, bitmap.GetPixels(), width * 4);
+            var handle = NativeMethods.FPDFBitmap_CreateEx(width, height, NativeMethods.FPDFBitmap.BGRA, bitmap.GetPixels(), width * 4);
 
             try
             {

src/Tests/TestUtils.cs

@@ -56,15 +56,15 @@ public static string GetPlatformAsString()
 
         public static FileStream GetInputStream(string filePath)
         {
-            return new FileStream(filePath, FileMode.Open, FileAccess.Read);
+            return new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.SequentialScan);
         }
 
         public static FileStream GetExpectedStream(string filePath)
         {
             if (!File.Exists(filePath))
                 Assert.Inconclusive("The expected asset '{0}' could not be found.", filePath);
 
-            return new FileStream(filePath, FileMode.Open, FileAccess.Read);
+            return new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.SequentialScan);
         }
 
         private static readonly object _lockObject = new();
@@ -87,7 +87,7 @@ public static Stream CreateOutputStream(string expectedPath)
                         outputPath,
                         FileMode.CreateNew,
                         FileAccess.ReadWrite,
-                        FileShare.Read,
+                        FileShare.None,
                         4096,
                         FileOptions.SequentialScan);
                 }

src/WebConverter/Pages/Index.razor.cs

@@ -118,6 +118,7 @@ private async Task Reset()
         private async Task Submit()
         {
             Logger.LogInformation("Converting {Model}.", Model);
+            SKBitmap? bitmap = null;
 
             try
             {
@@ -134,7 +135,6 @@ private async Task Submit()
                 }
 
                 Model.Input.Position = 0;
-                SKBitmap? bitmap = null;
                 bool encodeSuccess = false;
                 PdfAntiAliasing antiAliasing = default;
                 var backgroundColor = SKColors.White;
@@ -187,6 +187,7 @@ await Task.Factory.StartNew(() =>
             }
             finally
             {
+                bitmap?.Dispose();
                 IsLoading = false;
             }
         }