correctly render transparent backgrounds

Previously, some areas were "double exposed" to the transparency, making
them a bit darker than the rest.

The solution is to make sure that each part is drawn with the correct
background color, and then only copying pixels instead of blending them
to the final canvas.

1 files changed, 8 insertions, 3 deletions

diff --git a/src/render.rs b/src/render.rs
index e3f2d31..cbfd54f 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -135,9 +135,10 @@ impl<'r> Renderer<'r> {
     }
 
     pub fn render_skills(&mut self, skills: &[Option<Skill>]) -> Result<RgbaImage, RenderError> {
-        let mut buffer = ImageBuffer::new(
+        let mut buffer = ImageBuffer::from_pixel(
             skills.len() as u32 * self.options.skill_size,
             self.options.skill_size,
+            self.options.background_color,
         );
         for (i, skill) in skills.iter().enumerate() {
             if let Some(skill) = skill {
@@ -294,7 +295,11 @@ impl<'r> Renderer<'r> {
         specialization: &Specialization,
     ) -> Result<RgbaImage, RenderError> {
         let scale = self.options.text_size;
-        let mut buffer = ImageBuffer::new(self.options.traitline_width, scale);
+        let mut buffer = ImageBuffer::from_pixel(
+            self.options.traitline_width,
+            scale,
+            self.options.background_color,
+        );
         drawing::draw_text_mut(
             &mut buffer,
             self.options.text_color,
@@ -367,7 +372,7 @@ impl<'r> Renderer<'r> {
                 Alignment::Center => half(width - image.width()),
                 Alignment::Right => width - image.width(),
             };
-            imageops::overlay(&mut buffer, image, pos_x, pos_y);
+            buffer.copy_from(image, pos_x, pos_y);
             pos_y += image.height();
         }