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fix #2: Crash when drawing zero sized line

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This commit is contained in:
Dennis Ranke
2022-02-27 22:09:54 +01:00
parent 8815a8e02e
commit add49a1f8b
6 changed files with 132 additions and 14 deletions
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11
platform/src/platform.cwa
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@@ -256,6 +256,11 @@ export fn line(x1: f32, y1: f32, x2: f32, y2: f32, col: i32) {
p = y1;
}
if max_axis == 0 as f32 {
setPixel(x1 as i32, y1 as i32, col);
return;
}
let steps = floor(p + max_axis) as i32 - floor(p) as i32;
p = floor(p) + 0.5 - p;
if max_axis < 0 as f32 {
@@ -267,7 +272,7 @@ export fn line(x1: f32, y1: f32, x2: f32, y2: f32, col: i32) {
dy = dy / max_axis;
let f = min(max_axis, max(0 as f32, p));
setPixel((x1 + f * dx) as i32, (y1 + f * dy) as i32, col);
setPixel(i32.trunc_sat_f32_s(x1 + f * dx), i32.trunc_sat_f32_s(y1 + f * dy), col);
if !steps {
return;
@@ -280,7 +285,7 @@ export fn line(x1: f32, y1: f32, x2: f32, y2: f32, col: i32) {
loop pixels {
if steps := steps - 1 {
setPixel(x1 as i32, y1 as i32, col);
setPixel(i32.trunc_sat_f32_s(x1), i32.trunc_sat_f32_s(y1), col);
x1 = x1 + dx;
y1 = y1 + dy;
branch pixels;
@@ -288,7 +293,7 @@ export fn line(x1: f32, y1: f32, x2: f32, y2: f32, col: i32) {
}
f = min(max_axis, p) - p;
setPixel((x1 + f * dx) as i32, (y1 + f * dy) as i32, col);
setPixel(i32.trunc_sat_f32_s(x1 + f * dx), i32.trunc_sat_f32_s(y1 + f * dy), col);
}
//////////