Alberto Torres
9af1322937
* Incomplete port of myou-engine-js to nimskull, after many months of work, and a few extra features that weren't exactly necessary for a "first commit" to work. Excuse the lack of commit history up to this point. * Bare bones structure of the documentation and the process to update it. * Restructure of the whole project to have a more sensible organization. * Making submodules of forks of larger libraries. * README, licenses, AUTHORS.md.
66 lines
2.2 KiB
Nim
66 lines
2.2 KiB
Nim
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# License of this file:
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# Consider this file an extension of tinyexr.h (3-clause BSD)
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# import memfiles
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import tinyexr_c
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import arr_ref
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import ../float16/float16
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# import std/strutils
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{.compile: "miniz.c".}
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# Can't include implementation because it's cpp, we'll compile it separately
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{.compile("impl.cpp", "-std=c++11 -I.").}
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{.passL:"-lstdc++".}
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proc free(p: pointer) {.header: "stdlib.h", importc, nodecl, raises: [], gcsafe.}
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proc isEXR*(p: pointer, len: int): bool =
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IsEXRFromMemory(p, len.csize_t) == TINYEXR_SUCCESS
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proc getEXRDimensions*(p: pointer, len: int): (int, int) =
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var version: EXRVersion
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var ret = ParseEXRVersionFromMemory(version, p, len.csize_t)
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assert ret == TINYEXR_SUCCESS, "Can't read EXR version"
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var header: EXRHeader
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header.InitEXRHeader
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var err: const_cstring
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ret = ParseEXRHeaderFromMemory(header, version, p, len.csize_t, err)
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if ret != TINYEXR_SUCCESS:
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if err != nil:
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echo "error: " & $err
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FreeEXRErrorMessage(err)
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else:
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echo "undefined exr error"
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else:
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let width = 1 + header.data_window.max_x - header.data_window.min_x
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let height = 1 + header.data_window.max_y - header.data_window.min_y
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discard header.FreeEXRHeader
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return (width.int, height.int)
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proc decodeEXR*(p: pointer, len: int): (int, int, ArrRef[uint16]) =
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# TODO: avoid copying by using the internal API directly
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# TODO: decode float16 directly
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# TODO: why can't I use "float16" on the type?
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var img: ptr UncheckedArray[float32]
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var width: int32
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var height: int32
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var err: const_cstring
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let ret = LoadEXRFromMemory(img, width, height, p, len.csize_t, err)
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if ret != TINYEXR_SUCCESS:
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if err != nil:
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let errs = $err
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FreeEXRErrorMessage(err)
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raise newException(ValueError, errs)
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else:
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raise newException(ValueError, "Undefined tinyEXR error")
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var imglen = width*height*4
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var pixels = newArrRef[uint16](imglen)
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# pixels[0].addr.copyMem(img, imglen*sizeof(Float16))
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for i in 0 ..< imglen:
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pixels[i] = img[i].tofloat16(clamp=true).uint16
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free(img)
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return (width.int, height.int, pixels)
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