Add read image function

tinybackup · Oct 1, 2024 · 568897e · 568897e
1 parent d4ef83b
commit 568897e
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Showing 7 changed files with 24 additions and 4 deletions.
diff --git a/out.jpg b/out.jpg
diff --git a/out2.jpg b/out2.jpg
diff --git a/src/ansel.ex b/src/ansel.ex
@@ -1,6 +1,10 @@
 defmodule Ansel do
   alias Vix.Vips.{Image, Operation}
 
+  def read(path) do
+    Path.expand(path) |> Image.new_from_file
+  end
+
   def write_to_file(img, path) do
     save_path = Path.expand(path)
 

diff --git a/src/ansel.gleam b/src/ansel.gleam
@@ -94,6 +94,12 @@ fn composite_over_ffi(
   y: Int,
 ) -> Result(Image, String)
 
+@external(erlang, "Elixir.Vix.Vips.Image", "width")
+pub fn get_width(image: Image) -> Int
+
+@external(erlang, "Elixir.Vix.Vips.Image", "height")
+pub fn get_height(image: Image) -> Int
+
 pub fn resize_width_to(img: Image, res width: Int) -> Result(Image, snag.Snag) {
   resize_by(img, scale: int.to_float(width) /. int.to_float(get_width(img)))
 }
@@ -124,8 +130,11 @@ pub fn write(
 @external(erlang, "Elixir.Ansel", "write_to_file")
 fn write_ffi(img: Image, to path: String) -> Result(Nil, String)
 
-@external(erlang, "Elixir.Vix.Vips.Image", "width")
-pub fn get_width(image: Image) -> Int
+pub fn read(from path: String) -> Result(Image, snag.Snag) {
+  read_ffi(path)
+  |> result.map_error(snag.new)
+  |> snag.context("Failed to read image from file")
+}
 
-@external(erlang, "Elixir.Vix.Vips.Image", "height")
-pub fn get_height(image: Image) -> Int
+@external(erlang, "Elixir.Ansel", "read")
+fn read_ffi(from path: String) -> Result(Image, String)
diff --git a/ss.png b/ss.png
diff --git a/test.jpg b/test.jpg
diff --git a/test/ansel_test.gleam b/test/ansel_test.gleam
@@ -10,6 +10,13 @@ pub fn main() {
   gleeunit.main()
 }
 
+pub fn read_test() {
+  let assert Ok(img) = ansel.read("test/resources/gleam_lucy_6x6.avif")
+
+  ansel.get_width(img)
+  |> should.equal(6)
+}
+
 pub fn new_image_solid_grey_test() {
   let assert Ok(bin) =
     simplifile.read_bits("test/resources/solid_grey_6x6.avif")