ezResult ezImageConversion::ConvertSingleStep(const ezImageConversionStep* pStep, const ezImageView& source, ezImage& target,
ezImageFormat::Enum targetFormat)
{
if (!pStep)
{
target.ResetAndCopy(source);
return EZ_SUCCESS;
}
ezImageFormat::Enum sourceFormat = source.GetImageFormat();
ezImageHeader header = source.GetHeader();
header.SetImageFormat(targetFormat);
target.ResetAndAlloc(header);
if (!ezImageFormat::IsCompressed(sourceFormat))
{
if (!ezImageFormat::IsCompressed(targetFormat))
{
// we have to do the computation in 64-bit otherwise it might overflow for very large textures (8k x 4k or bigger).
ezUInt64 numElements =
ezUInt64(8) * (ezUInt64)target.GetArrayPtr<void>().GetCount() / (ezUInt64)ezImageFormat::GetBitsPerPixel(targetFormat);
return static_cast<const ezImageConversionStepLinear*>(pStep)->ConvertPixels(source.GetArrayPtr<void>(), target.GetArrayPtr<void>(),
(ezUInt32)numElements, sourceFormat, targetFormat);
}
else
{
return ConvertSingleStepCompress(source, target, sourceFormat, targetFormat, pStep);
}
}
else
{
return ConvertSingleStepDecompress(source, target, sourceFormat, targetFormat, pStep);
}
}
ezResult ezImageConversion::Convert(const ezImageView& source, ezImage& target, ezImageFormat::Enum targetFormat)
{
ezImageFormat::Enum sourceFormat = source.GetImageFormat();
// Trivial copy
if (sourceFormat == targetFormat)
{
if (&source != &target)
{
// copy if not already the same
target.ResetAndCopy(source);
}
return EZ_SUCCESS;
}
ezHybridArray<ConversionPathNode, 16> path;
ezUInt32 numScratchBuffers = 0;
if (BuildPath(sourceFormat, targetFormat, &source == &target, path, numScratchBuffers).Failed())
{
return EZ_FAILURE;
}
return Convert(source, target, path, numScratchBuffers);
}