Replace ImageMagick dependency with PNGFiles dependency

Project.toml

@@ -6,21 +6,18 @@ version = "0.3.1"
 Base64 = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
 Cairo = "159f3aea-2a34-519c-b102-8c37f9878175"
 CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"
-FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"
 ImageCore = "a09fc81d-aa75-5fe9-8630-4744c3626534"
-ImageMagick = "6218d12a-5da1-5696-b52f-db25d2ecc6d1"
 Interpolations = "a98d9a8b-a2ab-59e6-89dd-64a1c18fca59"
+PNGFiles = "f57f5aa1-a3ce-4bc8-8ab9-96f992907883"
 Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 Rsvg = "c4c386cf-5103-5370-be45-f3a111cca3b8"
-libpng_jll = "b53b4c65-9356-5827-b1ea-8c7a1a84506f"
 
 [compat]
 Cairo = "1.0.4"
 CodecZlib = "0.7"
-FileIO = "1.4.0"
 ImageCore = "0.8, 0.9"
-ImageMagick = "1.1.5"
 Interpolations = "0.13.2"
+PNGFiles = "0.3.7"
 Requires = "1.0.3"
 Rsvg = "1.0.0"
 julia = "1.4"

src/KittyTerminalImages.jl

@@ -1,6 +1,5 @@
 module KittyTerminalImages
 
-using FileIO: load, save, Stream, @format_str
 using Base64: base64encode
 using Rsvg
 using Cairo: FORMAT_ARGB32, CairoImageSurface, CairoContext
@@ -10,13 +9,10 @@ using ImageCore: RGBA, channelview
 using CodecZlib: ZlibCompressor, ZlibCompressorStream
 using Requires: @require
 using Interpolations: interpolate, BSpline, Linear
+using PNGFiles
 
 import Base: display
 
-# this seem to be necessary to enforce the usage of ImageMagic -- ImageIO
-# produces an eof error.
-using ImageMagick
-
 export pushKittyDisplay!, forceKittyDisplay!, set_kitty_config!, get_kitty_config
 
 
@@ -35,7 +31,7 @@ function draw_temp_file(img)
 
     # TODO ensure that there is no racing condition with these tempfiles
     path, io = mktemp()
-    ImageMagick.save_(Stream(format"PNG", io), img)
+    PNGFiles.save(io, img)
     close(io)
 
     payload = transcode(UInt8, base64encode(path))
@@ -158,7 +154,8 @@ function display(d::KittyDisplay,
                  m::MIME"image/png", x; scale=get_kitty_config(:scale, 1.0))
     buff = IOBuffer()
     show_custom(buff, m, x)
-    img = load(Stream(format"PNG", buff))
+    seekstart(buff)  # we need to reset the IOBuffer to it's start
+    img = PNGFiles.load(buff)
     img = imresize(img; ratio=scale)
 
     if get_kitty_config(:transfer_mode) == :direct