Do not try to load bitmap for unsupported file format.

When we try to call GetClosestImageSize for svg, lottie format files,
It will always try to decode WBMP format, which is not has magic number.

To avoid this useless file decode works, let we implement to fast-cancel
of full image decode logics for some case.

Change-Id: I6f6ba1e05ce4d12be62440923f383362d2df73d3
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>

diff --git a/dali/internal/imaging/common/image-loader.cpp b/dali/internal/imaging/common/image-loader.cpp
index 9f9db11..5f6623b 100644 (file)
--- a/dali/internal/imaging/common/image-loader.cpp
+++ b/dali/internal/imaging/common/image-loader.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2023 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -54,6 +54,9 @@ static bool gMaxTextureSizeUpdated = false;
  */
 enum FileFormats
 {
+  // Unsupported file format that we should not process image loader.
+  FORMAT_UNSUPPORTED = -2,
+
   // Unknown file format
   FORMAT_UNKNOWN = -1,
 
@@ -99,12 +102,12 @@ const unsigned int MAGIC_LENGTH = 2;
  */
 struct FormatExtension
 {
-  const std::string extension;
-  FileFormats       format;
+  const std::string_view extension;
+  FileFormats            format;
 };
 
 // clang-format off
-const FormatExtension FORMAT_EXTENSIONS[] =
+constexpr FormatExtension FORMAT_EXTENSIONS[] =
   {
     {".png",  FORMAT_PNG },
     {".jpg",  FORMAT_JPEG},
@@ -114,7 +117,10 @@ const FormatExtension FORMAT_EXTENSIONS[] =
     {".ktx",  FORMAT_KTX },
     {".astc", FORMAT_ASTC},
     {".ico",  FORMAT_ICO },
-    {".wbmp", FORMAT_WBMP}
+    {".wbmp", FORMAT_WBMP},
+    {".svg",  FORMAT_UNSUPPORTED}, // SVG
+    {".tvg",  FORMAT_UNSUPPORTED}, // ThorVG
+    {".json", FORMAT_UNSUPPORTED}, // Lottie
   };
 // clang-format on
 
@@ -156,6 +162,12 @@ bool GetBitmapLoaderFunctions(FILE*                                        fp,
                               Bitmap::Profile&                             profile,
                               const std::string&                           filename)
 {
+  // Fast out if image loader doesn't support the format.
+  if(DALI_UNLIKELY(format == FORMAT_UNSUPPORTED))
+  {
+    return false;
+  }
+
   unsigned char magic[MAGIC_LENGTH];
   size_t        read = fread(magic, sizeof(unsigned char), MAGIC_LENGTH, fp);
 
@@ -415,6 +427,14 @@ ImageDimensions GetClosestImageSize(const std::string& filename,
   unsigned int width  = 0;
   unsigned int height = 0;
 
+  const FileFormats formatHint = GetFormatHint(filename);
+
+  // Fast out if image loader doesn't support the format.
+  if(formatHint == FileFormats::FORMAT_UNSUPPORTED)
+  {
+    return ImageDimensions(width, height);
+  }
+
   Internal::Platform::FileReader fileReader(filename);
   FILE*                          fp = fileReader.GetFile();
   if(fp != NULL)
@@ -425,7 +445,7 @@ ImageDimensions GetClosestImageSize(const std::string& filename,
     Bitmap::Profile                             profile;
 
     if(GetBitmapLoaderFunctions(fp,
-                                GetFormatHint(filename),
+                                formatHint,
                                 loaderFunction,
                                 planeLoader,
                                 headerFunction,