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Tweak should_key_image

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Chris Tsang
2022-10-09 17:20:42 +08:00
parent a7219fd370
commit ead104f0ce
1 changed files with 7 additions and 19 deletions
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26
cmdapp/src/converter.rs
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@@ -63,28 +63,16 @@ fn should_key_image(img: &ColorImage) -> bool {
return false;
}
// Check for transparency in top and bottom rows of pixels
// Check for transparency at several scanlines
let threshold = ((img.width * 2) as f32 * KEYING_THRESHOLD) as usize;
let mut num_transparent_boundary_pixels = 0;
for x in 0..img.width {
if img.get_pixel(x, 0).a == 0 {
num_transparent_boundary_pixels += 1;
}
if img.get_pixel(x, img.height - 1).a == 0 {
num_transparent_boundary_pixels += 1;
}
if num_transparent_boundary_pixels >= threshold {
return true;
}
}
// Check for transparency in some inner pixels
let x_positions = [img.width / 4, img.width / 2, 3 * img.width / 4];
let y_positions = [img.height / 4, img.height / 2, 3 * img.height / 4];
for x in x_positions {
for y in y_positions {
let y_positions = [0, img.height / 4, img.height / 2, 3 * img.height / 4, img.height - 1];
for y in y_positions {
for x in 0..img.width {
if img.get_pixel(x, y).a == 0 {
num_transparent_boundary_pixels += 1;
}
if num_transparent_boundary_pixels >= threshold {
return true;
}
}