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Add support for LoadFromEXRMemory as other formats #645

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170 changes: 114 additions & 56 deletions Auxiliary/DirectXTexEXR.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -61,9 +61,50 @@ static_assert(sizeof(Imf::Rgba) == 8, "Mismatch size");
using namespace DirectX;
using PackedVector::XMHALF4;

#ifdef _WIN32
namespace
{
class InputStream : public Imf::IStream
{
public:
InputStream(const uint8_t* data, size_t size)
: IStream("InputStream")
, m_DataPtr(data)
, m_DataSize(size)
, m_Position(0)
{}

bool read(char c[], int n) override
{
memcpy(c, m_DataPtr + m_Position, n);
m_Position += n;

return m_Position < m_DataSize;
}

uint64_t tellg() override
{
return m_Position;
}

void seekg(uint64_t pos) override
{
m_Position = pos;
}

#if COMBINED_OPENEXR_VERSION > 30300
int64_t read(void *buf, uint64_t sz, uint64_t offset) override
{
return Imf::IStream::read(buf, sz, offset);
}
#endif

private:
const uint8_t* m_DataPtr;
size_t m_DataSize;
size_t m_Position;
};

#ifdef _WIN32
class com_exception : public std::exception
{
public:
Expand All @@ -82,10 +123,10 @@ namespace
HRESULT result;
};

class InputStream : public Imf::IStream
class InputFileStream : public Imf::IStream
{
public:
InputStream(HANDLE hFile, const char fileName[]) :
InputFileStream(HANDLE hFile, const char fileName[]) :
IStream(fileName), m_hFile(hFile)
{
const LARGE_INTEGER dist = {};
Expand All @@ -103,11 +144,11 @@ namespace
}
}

InputStream(const InputStream&) = delete;
InputStream& operator = (const InputStream&) = delete;
InputFileStream(const InputFileStream&) = delete;
InputFileStream& operator = (const InputFileStream&) = delete;

InputStream(InputStream&&) = delete;
InputStream& operator=(InputStream&&) = delete;
InputFileStream(InputFileStream&&) = delete;
InputFileStream& operator=(InputFileStream&&) = delete;

bool read(char c[], int n) override
{
Expand Down Expand Up @@ -153,7 +194,7 @@ namespace
SetLastError(0);
}

#if COMBINED_OPENEXR_VERSION >= 30300
#if COMBINED_OPENEXR_VERSION > 30300
int64_t read(void *buf, uint64_t sz, uint64_t offset) override
{
return Imf::IStream::read(buf, sz, offset);
Expand All @@ -165,18 +206,18 @@ namespace
LONGLONG m_EOF;
};

class OutputStream : public Imf::OStream
class OutputFileStream : public Imf::OStream
{
public:
OutputStream(HANDLE hFile, const char fileName[]) :
OutputFileStream(HANDLE hFile, const char fileName[]) :
OStream(fileName), m_hFile(hFile)
{}

OutputStream(const OutputStream&) = delete;
OutputStream& operator = (const OutputStream&) = delete;
OutputFileStream(const OutputFileStream&) = delete;
OutputFileStream& operator = (const OutputFileStream&) = delete;

OutputStream(OutputStream&&) = delete;
OutputStream& operator=(OutputStream&&) = delete;
OutputFileStream(OutputFileStream&&) = delete;
OutputFileStream& operator=(OutputFileStream&&) = delete;

void write(const char c[], int n) override
{
Expand Down Expand Up @@ -211,9 +252,8 @@ namespace
private:
HANDLE m_hFile;
};
}
#endif // _WIN32

}

//=====================================================================================
// Entry-points
Expand Down Expand Up @@ -250,7 +290,7 @@ HRESULT DirectX::GetMetadataFromEXRFile(const wchar_t* szFile, TexMetadata& meta
return HRESULT_FROM_WIN32(GetLastError());
}

InputStream stream(hFile.get(), fileName.c_str());
InputFileStream stream(hFile.get(), fileName.c_str());
#else
std::wstring wFileName(szFile);
std::string fileName(wFileName.cbegin(), wFileName.cend());
Expand Down Expand Up @@ -320,60 +360,25 @@ HRESULT DirectX::GetMetadataFromEXRFile(const wchar_t* szFile, TexMetadata& meta
return hr;
}


//-------------------------------------------------------------------------------------
// Load a EXR file from disk
// Load
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::LoadFromEXRFile(const wchar_t* szFile, TexMetadata* metadata, ScratchImage& image)
template <typename StreamType>
HRESULT LoadFromEXRCommon(StreamType& stream, TexMetadata* metadata, ScratchImage& image)
{
if (!szFile)
return E_INVALIDARG;

image.Release();

if (metadata)
{
memset(metadata, 0, sizeof(TexMetadata));
}

#ifdef _WIN32
std::string fileName;
const int nameLength = WideCharToMultiByte(CP_UTF8, 0, szFile, -1, nullptr, 0, nullptr, nullptr);
if (nameLength > 0)
{
fileName.resize(static_cast<size_t>(nameLength));
const int result = WideCharToMultiByte(CP_UTF8, 0, szFile, -1, fileName.data(), nameLength, nullptr, nullptr);
if (result <= 0)
{
fileName.clear();
}
}

ScopedHandle hFile(safe_handle(CreateFile2(
szFile,
GENERIC_READ, FILE_SHARE_READ, OPEN_EXISTING,
nullptr)));
if (!hFile)
{
return HRESULT_FROM_WIN32(GetLastError());
}

InputStream stream(hFile.get(), fileName.c_str());
#else
std::wstring wFileName(szFile);
std::string fileName(wFileName.cbegin(), wFileName.cend());
#endif

HRESULT hr = S_OK;

try
{
#ifdef _WIN32
Imf::RgbaInputFile file(stream);
#else
Imf::RgbaInputFile file(fileName.c_str());
#endif

const auto dw = file.dataWindow();

Expand Down Expand Up @@ -446,6 +451,59 @@ HRESULT DirectX::LoadFromEXRFile(const wchar_t* szFile, TexMetadata* metadata, S
return hr;
}

//-------------------------------------------------------------------------------------
// Load a EXR file from memory
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::LoadFromEXRMemory(const uint8_t* pSource, size_t size, TexMetadata* metadata, ScratchImage& image)
{
if (!pSource || !size)
return E_INVALIDARG;

InputStream stream(pSource, size);
return LoadFromEXRCommon(stream, metadata, image);
}

//-------------------------------------------------------------------------------------
// Load a EXR file from disk
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::LoadFromEXRFile(const wchar_t* szFile, TexMetadata* metadata, ScratchImage& image)
{
if (!szFile)
return E_INVALIDARG;

#ifdef _WIN32
std::string fileName;
const int nameLength = WideCharToMultiByte(CP_UTF8, 0, szFile, -1, nullptr, 0, nullptr, nullptr);
if (nameLength > 0)
{
fileName.resize(static_cast<size_t>(nameLength));
const int result = WideCharToMultiByte(CP_UTF8, 0, szFile, -1, fileName.data(), nameLength, nullptr, nullptr);
if (result <= 0)
{
fileName.clear();
}
}

ScopedHandle hFile(safe_handle(CreateFile2(
szFile,
GENERIC_READ, FILE_SHARE_READ, OPEN_EXISTING,
nullptr)));
if (!hFile)
{
return HRESULT_FROM_WIN32(GetLastError());
}

InputFileStream stream(hFile.get(), fileName.c_str());
return LoadFromEXRCommon(stream, metadata, image);
#else
std::wstring wFileName(szFile);
std::string fileName(wFileName.cbegin(), wFileName.cend());
return LoadFromEXRCommon(fileName.c_str(), metadata, image);
#endif
}


//-------------------------------------------------------------------------------------
// Save a EXR file to disk
Expand Down Expand Up @@ -502,7 +560,7 @@ HRESULT DirectX::SaveToEXRFile(const Image& image, const wchar_t* szFile)

auto_delete_file delonfail(hFile.get());

OutputStream stream(hFile.get(), fileName.c_str());
OutputFileStream stream(hFile.get(), fileName.c_str());
#else
std::wstring wFileName(szFile);
std::string fileName(wFileName.cbegin(), wFileName.cend());
Expand Down
4 changes: 4 additions & 0 deletions Auxiliary/DirectXTexEXR.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,10 @@ namespace DirectX
_In_z_ const wchar_t* szFile,
_Out_ TexMetadata& metadata);

DIRECTX_TEX_API HRESULT __cdecl LoadFromEXRMemory(
_In_reads_bytes_(size) const uint8_t* pSource, _In_ size_t size,
_Out_opt_ TexMetadata* metadata, _Out_ ScratchImage& image);

DIRECTX_TEX_API HRESULT __cdecl LoadFromEXRFile(
_In_z_ const wchar_t* szFile,
_Out_opt_ TexMetadata* metadata, _Out_ ScratchImage& image);
Expand Down