From f589ed9931f49ab02e853a8abab215778e218a9b Mon Sep 17 00:00:00 2001
From: Egor Yusov <egor.yusov@gmail.com>
Date: Thu, 27 Jun 2019 09:12:22 -0700
Subject: Minor updates to image loading functions

---
 TextureLoader/src/Image.cpp | 71 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 69 insertions(+), 2 deletions(-)

(limited to 'TextureLoader/src/Image.cpp')

diff --git a/TextureLoader/src/Image.cpp b/TextureLoader/src/Image.cpp
index be05fe0..b7703ab 100644
--- a/TextureLoader/src/Image.cpp
+++ b/TextureLoader/src/Image.cpp
@@ -38,6 +38,8 @@
 #include "RefCntAutoPtr.h"
 #include "Align.h"
 #include "GraphicsAccessories.h"
+#include "BasicFileStream.h"
+#include "StringTools.h"
 
 namespace Diligent
 {
@@ -424,9 +426,9 @@ Image::Image( IReferenceCounters*    pRefCounters,
     }
 }
 
-void Image::CreateFromDataBlob(IDataBlob *pFileData,
+void Image::CreateFromDataBlob(IDataBlob*            pFileData,
                                 const ImageLoadInfo& LoadInfo,
-                                Image **ppImage)
+                                Image**              ppImage)
 {
     *ppImage = MakeNewRCObj<Image>()(pFileData, LoadInfo);
     (*ppImage)->AddRef();
@@ -689,4 +691,69 @@ EImageFileFormat Image::GetFileFormat(const Uint8* pData, size_t Size)
     return EImageFileFormat::unknown;
 }
 
+
+EImageFileFormat CreateImageFromFile(const Char*  FilePath, 
+                                     Image**      ppImage,
+                                     IDataBlob**  ppRawData)
+{
+    EImageFileFormat ImgFileFormat = EImageFileFormat::unknown;
+    try
+    {
+        RefCntAutoPtr<BasicFileStream> pFileStream(MakeNewRCObj<BasicFileStream>()(FilePath, EFileAccessMode::Read));
+        if(!pFileStream->IsValid())
+            LOG_ERROR_AND_THROW("Failed to open image file \"", FilePath, '\"');
+
+        RefCntAutoPtr<IDataBlob> pFileData(MakeNewRCObj<DataBlobImpl>()(0));
+        pFileStream->Read(pFileData);
+
+        ImgFileFormat = Image::GetFileFormat(reinterpret_cast<Uint8*>(pFileData->GetDataPtr()), pFileData->GetSize());
+        if (ImgFileFormat == EImageFileFormat::unknown)
+        {
+            LOG_WARNING_MESSAGE("Unable to derive image format from the header for file \"", FilePath, "\". Trying to analyze extension.");
+
+            // Try to use extension to derive format
+            auto *pDotPos = strrchr(FilePath, '.');
+            if (pDotPos == nullptr)
+                LOG_ERROR_AND_THROW("Unable to recognize file format: file name \"", FilePath, "\" does not contain extension");
+
+            auto *pExtension = pDotPos + 1;
+            if (*pExtension == 0)
+                LOG_ERROR_AND_THROW("Unable to recognize file format: file name \"", FilePath, "\" contain empty extension");
+
+            String Extension = StrToLower(pExtension);
+            if (Extension == "png")
+                ImgFileFormat = EImageFileFormat::png;
+            else if (Extension == "jpeg" || Extension == "jpg")
+                ImgFileFormat = EImageFileFormat::jpeg;
+            else if (Extension == "tiff" || Extension == "tif")
+                ImgFileFormat = EImageFileFormat::tiff;
+            else if (Extension == "dds")
+                ImgFileFormat = EImageFileFormat::dds;
+            else if (Extension == "ktx")
+                ImgFileFormat = EImageFileFormat::ktx;
+            else
+                LOG_ERROR_AND_THROW("Unsupported file format ", Extension);
+        }
+
+        if (ImgFileFormat == EImageFileFormat::png  ||
+            ImgFileFormat == EImageFileFormat::jpeg ||
+            ImgFileFormat == EImageFileFormat::tiff)
+        {
+            ImageLoadInfo ImgLoadInfo;
+            ImgLoadInfo.Format = ImgFileFormat;
+            Image::CreateFromDataBlob(pFileData, ImgLoadInfo, ppImage);
+        }
+        else if(ppRawData != nullptr)
+        {
+            *ppRawData = pFileData.Detach();
+        }
+    }
+    catch (std::runtime_error &err)
+    {
+        LOG_ERROR("Failed to create image from file: ", err.what());
+    }
+
+    return ImgFileFormat;
+}
+
 } // namespace Diligent
-- 
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