Feat: manual image x and y size to support svg

Project.toml

@@ -1,7 +1,7 @@
 name = "PPTX"
 uuid = "14a86994-10a4-4a7d-b9ad-ef6f3b1fac6a"
 authors = ["Xander de Vries", "Matthijs Cox"]
-version = "0.6.1"
+version = "0.6.2"
 
 [deps]
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"

src/Picture.jl

@@ -23,6 +23,20 @@ Picture
  size_x is 1440000 EMUs
  size_y is 1475072 EMUs
 
+```
+
+Optionally, you can set the `size_x` and `size_y` manually for filetypes not supported by FileIO, such as SVG.
+```julia
+julia> using PPTX
+
+julia> img = Picture(joinpath(PPTX.ASSETS_DIR, "julia_logo.svg"); size_x=40, size_y=30)
+Picture
+ source is "./julia_logo.svg"
+ offset_x is 0 EMUs
+ offset_y is 0 EMUs
+ size_x is 1440000 EMUs
+ size_y is 1080000 EMUs
+
 ```
 """
 struct Picture <: AbstractShape
@@ -34,21 +48,37 @@ struct Picture <: AbstractShape
     rid::Int
 end
 
-function Picture(source::String; top::Real=0, left::Real=0, offset_x::Real=left, offset_y::Real=top, size::Real=40, rid::Int=0)
-    ratio = image_aspect_ratio(source)
-    size_x = Int(round(size * _EMUS_PER_MM))
-    size_y = Int(round(size_x / ratio))
+function Picture(
+    source::String;
+    top::Real=0,
+    left::Real=0,
+    offset_x::Real=left,
+    offset_y::Real=top,
+    size::Real=40,
+    size_x::Real=size,
+    size_y::Union{Nothing, Real}=nothing,
+    rid::Int=0,
+)
+    scaled_size_x = Int(round(size_x * _EMUS_PER_MM))
+    if isnothing(size_y)
+        ratio = image_aspect_ratio(source)
+        scaled_size_y = Int(round(scaled_size_x / ratio))
+    else
+        scaled_size_y = Int(round(size_y * _EMUS_PER_MM))
+    end
     return Picture(
         source,
         Int(round(offset_x * _EMUS_PER_MM)),
         Int(round(offset_y * _EMUS_PER_MM)),
-        size_x,
-        size_y,
+        scaled_size_x,
+        scaled_size_y,
         rid,
     )
 end
 
-set_rid(s::Picture, i::Int) = Picture(s.source, s.offset_x, s.offset_y, s.size_x, s.size_y, i)
+function set_rid(s::Picture, i::Int)
+    return Picture(s.source, s.offset_x, s.offset_y, s.size_x, s.size_y, i)
+end
 rid(s::Picture) = s.rid
 has_rid(s::Picture) = true
 
@@ -116,8 +146,16 @@ function copy_picture(p::Picture)
 end
 
 function image_aspect_ratio(path::String)
-    img = load(path)
+    local img
+    try
+        img = load(path)
+    catch e
+        if e isa ErrorException && contains(e.msg, "No applicable_loaders found")
+            error("Cannot load image to determine aspect ratio, consider setting `size_x` and `size_y` manually.")
+        else
+            rethrow(e)
+        end
+    end
     height, width = size(img)
     return width / height
 end
-

test/testConstructors.jl

@@ -43,6 +43,17 @@ using Test
 
         contains(PPTX._show_string(pic2, false), "source is \"$(pic.source)\"")
     end
+    @testset "Picture - custom aspect ratio" begin
+        # SVG is not supported by FileIO.jl
+        # this means we need to manually set the aspect ratio
+        logo_path = joinpath(PPTX.ASSETS_DIR,"julia_logo.svg")
+        msg = "Cannot load image to determine aspect ratio, consider setting `size_x` and `size_y` manually."
+        @test_throws ErrorException(msg) pic = Picture(logo_path)
+
+        pic = Picture(logo_path; size_x=40, size_y=30)
+        @test pic.size_x == 1440000
+        @test pic.size_y == 1080000
+    end
     @testset "empty" begin
         p = Presentation()
         ps = slides(p)