Fix bug where images with width or height 1 are being completely cleared by image effects

Author: OverloadedOrama

CHANGELOG.md

@@ -33,6 +33,7 @@ Built using Godot 3.5.2
 - The same frames are no longer being exported multiple times when "Selected frames" is selected, and multiple cels of the same frames are currently selected on the timeline. [#1001](https://github.com/Orama-Interactive/Pixelorama/issues/1001)
 - Fixed crash due to division by zero when locking two or three ValueSliders, and one of them has the value of 0 and the user attempts to change it.
 - Fixed exporting selected layers not including the non-selected frames.
+- Fix bug where images with width or height 1 are being completely cleared by image effects.
 - Made the color picker not select fully transparent pixels that are not black. [#999](https://github.com/Orama-Interactive/Pixelorama/issues/999)
 - The ellipse tool no longer produces gaps with large sizes. [4f3a7a305a264e0d2fe86c201af76eca4b2fea0a](https://github.com/Orama-Interactive/Pixelorama/commit/4f3a7a305a264e0d2fe86c201af76eca4b2fea0a)
 - Fix "visible layers" option on the export dialog producing wrong results. [346d1f071a8c6b1defb1072d39aea9c642f1ef59](https://github.com/Orama-Interactive/Pixelorama/commit/346d1f071a8c6b1defb1072d39aea9c642f1ef59)

src/Classes/ShaderImageEffect.gd

@@ -6,6 +6,16 @@ signal done
 
 func generate_image(img: Image, shader: Shader, params: Dictionary, size: Vector2) -> void:
 	img.unlock()
+	var resized_width := false
+	var resized_height := false
+	if size.x == 1:
+		size.x = 2
+		img.crop(2, img.get_height())
+		resized_width = true
+	if size.y == 1:
+		size.y = 2
+		img.crop(img.get_width(), 2)
+		resized_height = true
 	# duplicate shader before modifying code to avoid affecting original resource
 	shader = shader.duplicate()
 	shader.code = shader.code.replace("unshaded", "unshaded, blend_premul_alpha")
@@ -42,4 +52,8 @@ func generate_image(img: Image, shader: Shader, params: Dictionary, size: Vector
 	VisualServer.free_rid(texture)
 	viewport_texture.convert(Image.FORMAT_RGBA8)
 	img.copy_from(viewport_texture)
+	if resized_width:
+		img.crop(img.get_width() - 1, img.get_height())
+	if resized_height:
+		img.crop(img.get_width(), img.get_height() - 1)
 	emit_signal("done")