Remove ImageMagick

Compat is a pain and we can do the file type check using the magic bits from FileIO.

Project.toml

@@ -9,7 +9,6 @@ Extents = "411431e0-e8b7-467b-b5e0-f676ba4f2910"
 GeoInterface = "cf35fbd7-0cd7-5166-be24-54bfbe79505f"
 GeometryBasics = "5c1252a2-5f33-56bf-86c9-59e7332b4326"
 HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
-ImageMagick = "6218d12a-5da1-5696-b52f-db25d2ecc6d1"
 LRUCache = "8ac3fa9e-de4c-5943-b1dc-09c6b5f20637"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Makie = "ee78f7c6-11fb-53f2-987a-cfe4a2b5a57a"
@@ -31,7 +30,6 @@ MapTiles = "1"
 OrderedCollections = "1"
 ThreadSafeDicts = "0.1"
 TileProviders = "0.1"
-ImageMagick = "1.3"
 julia = "1"
 
 [extras]

src/Tyler.jl

@@ -5,10 +5,10 @@ using Extents: Extents, Extent
 using GeoInterface: GeoInterface
 using GeometryBasics: GeometryBasics, GLTriangleFace, Point2f, Vec2f, Rect2f, Rect2, Rect, decompose, decompose_uv
 using HTTP: HTTP
-using ImageMagick: ImageMagick
 using LRUCache: LRUCache, LRU
 using MapTiles: MapTiles, Tile, TileGrid, web_mercator, wgs84, CoordinateReferenceSystemFormat
 using Makie: Makie, Observable, Figure, Axis, RGBAf, on, isopen, linesegments!, meta, mesh!, translate!, scale!
+using Makie: FileIO, ImageIO
 using OrderedCollections: OrderedCollections, OrderedSet
 using ThreadSafeDicts: ThreadSafeDicts, ThreadSafeDict
 using TileProviders: TileProviders, AbstractProvider, geturl, min_zoom, max_zoom
@@ -302,7 +302,9 @@ end
 function fetch_tile(provider::AbstractProvider, tile::Tile)
     url = TileProviders.geturl(provider, tile.x, tile.y, tile.z)
     result = HTTP.get(url; retry=false, readtimeout=4, connect_timeout=4)
-    return ImageMagick.readblob(result.body)
+    io = IOBuffer(result.body)
+    format = FileIO.query(io) # this interrogates the magic bits to see what to do
+    return FileIO.load(format) # this actually loads the data using ImageIO.jl or whatever other FileIO loader exists
 end
 
 function queue_tile!(tyler::Map, tile)