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just use copyMem

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This commit is contained in:
Ryan Oldenburg 2022-06-08 16:49:31 -05:00
parent 1e092f4ae8
commit 537f28e5d0
1 changed files with 11 additions and 12 deletions
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23
src/pixie/fileformats/png.nim
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@ -90,7 +90,7 @@ proc decodePalette(data: string): seq[ColorRGB] =
result.setLen(data.len div 3)
for i in 0 ..< data.len div 3:
result[i] = cast[ptr ColorRGB](data[i * 3].unsafeAddr)[]
copyMem(result[i].addr, data[i * 3].unsafeAddr, 3)
proc unfilter(
uncompressed: string, height, rowBytes, bpp: int
@ -262,21 +262,20 @@ proc decodeImageData(
# While we can read an extra byte safely, do so. Much faster.
for i in 0 ..< header.height * header.width - 1:
var rgba = cast[ptr ColorRGBA](unfiltered[i * 3].unsafeAddr)[]
rgba.a = 255
if rgba == special:
rgba.a = 0
result[i] = rgba
copyMem(result[i].addr, unfiltered[i * 3].unsafeAddr, 4)
result[i].a = 255
if result[i] == special:
result[i].a = 0
else:
# While we can read an extra byte safely, do so. Much faster.
# var rgba: ColorRGBA
for i in 0 ..< header.height * header.width - 1:
var rgba = cast[ptr ColorRGBA](unfiltered[i * 3].unsafeAddr)[]
rgba.a = 255
result[i] = rgba
copyMem(result[i].addr, unfiltered[i * 3].unsafeAddr, 4)
result[i].a = 255
let
lastOffset = header.height * header.width - 1
rgb = cast[ptr array[3, uint8]](unfiltered[lastOffset * 3].unsafeAddr)[]
let lastOffset = header.height * header.width - 1
var rgb: array[3, uint8]
copyMem(rgb.addr, unfiltered[lastOffset * 3].unsafeAddr, 3)
var rgba = ColorRGBA(r: rgb[0], g: rgb[1], b: rgb[2], a: 255)
if rgba == special:
rgba.a = 0