}
bool FExrImageWrapper::SetCompressed( const void* InCompressedData, int32 InCompressedSize )
{
if(!FImageWrapperBase::SetCompressed( InCompressedData, InCompressedSize))
{
return false;
}
FMemFileIn MemFile(InCompressedData, InCompressedSize);
if(!IsThisAnOpenExrFile(MemFile))
{
return false;
}
Imf::RgbaInputFile ImfFile(MemFile);
Imath::Box2i win = ImfFile.dataWindow();
Imath::V2i dim(win.max.x - win.min.x + 1, win.max.y - win.min.y + 1);
BitDepth = 16;
Width = dim.x;
Height = dim.y;
// ideally we can specify float here
Format = ERGBFormat::RGBA;
void FExrImageWrapper::CompressRaw(const sourcetype* SrcData, bool bIgnoreAlpha)
{
uint32 NumWriteComponents = GetNumChannelsFromFormat(RawFormat);
if (bIgnoreAlpha && NumWriteComponents == 4)
{
NumWriteComponents = 3;
}
Imf::Header Header(Width, Height);
for (uint32 Channel = 0; Channel < NumWriteComponents; Channel++)
{
Header.channels().insert(GetRawChannelName(Channel), Imf::Channel(OutputFormat));
}
FMemFileOut MemFile("");
Imf::FrameBuffer ImfFrameBuffer;
TArray<uint8> ChannelOutputBuffers[4];
for (uint32 Channel = 0; Channel < NumWriteComponents; Channel++)
{
WriteFrameBufferChannel<OutputFormat>(ImfFrameBuffer, GetRawChannelName(Channel), SrcData + Channel, ChannelOutputBuffers[Channel]);
}
Imf::OutputFile ImfFile(MemFile, Header);
ImfFile.setFrameBuffer(ImfFrameBuffer);
ImfFile.writePixels(Height);
CompressedData = MemFile.Data;
}
void FExrImageWrapper::Uncompress( const ERGBFormat::Type InFormat, const int32 InBitDepth )
{
// Ensure we haven't already uncompressed the file.
if ( RawData.Num() != 0 )
{
return;
}
FMemFileIn MemFile(&CompressedData[0], CompressedData.Num());
Imf::RgbaInputFile ImfFile(MemFile);
Imath::Box2i win = ImfFile.dataWindow();
check(BitDepth == 16);
check(Width);
check(Height);
uint32 Channels = 4;
RawData.Empty();
RawData.AddUninitialized( Width * Height * Channels * (BitDepth / 8) );
int dx = win.min.x;
int dy = win.min.y;
ImfFile.setFrameBuffer((Imf::Rgba*)&RawData[0] - dx - dy * Width, 1, Width);
ImfFile.readPixels(win.min.y, win.max.y);
}
void FExrImageWrapper::CompressRaw(const sourcetype* SrcData, bool bIgnoreAlpha)
{
const double StartTime = FPlatformTime::Seconds();
uint32 NumWriteComponents = GetNumChannelsFromFormat(RawFormat);
if (bIgnoreAlpha && NumWriteComponents == 4)
{
NumWriteComponents = 3;
}
Imf::Compression Comp = bUseCompression ? Imf::Compression::ZIP_COMPRESSION : Imf::Compression::NO_COMPRESSION;
Imf::Header Header(Width, Height, 1, Imath::V2f(0, 0), 1, Imf::LineOrder::INCREASING_Y, Comp);
for (uint32 Channel = 0; Channel < NumWriteComponents; Channel++)
{
Header.channels().insert(GetRawChannelName(Channel), Imf::Channel(OutputFormat));
}
FMemFileOut MemFile("");
const int32 OutputPixelSize = ((OutputFormat == Imf::HALF && bUseCompression) ? 2 : 4);
MemFile.Data.AddUninitialized(Width * Height * NumWriteComponents * OutputPixelSize);
Imf::FrameBuffer ImfFrameBuffer;
TArray<uint8> ChannelOutputBuffers[4];
for (uint32 Channel = 0; Channel < NumWriteComponents; Channel++)
{
WriteFrameBufferChannel<OutputFormat>(ImfFrameBuffer, GetRawChannelName(Channel), SrcData + Channel, ChannelOutputBuffers[Channel]);
}
Imf::OutputFile ImfFile(MemFile, Header);
ImfFile.setFrameBuffer(ImfFrameBuffer);
ImfFile.writePixels(Height);
CompressedData.AddUninitialized(MemFile.tellp());
FMemory::Memcpy(CompressedData.GetData(), MemFile.Data.GetData(), MemFile.tellp());
const double DeltaTime = FPlatformTime::Seconds() - StartTime;
UE_LOG(LogImageWrapper, Verbose, TEXT("Compressed image in %.3f seconds"), DeltaTime);
}
