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render: avoid left shifting negative values

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It's undefined behavior.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2020-12-16 22:53:12 +00:00
parent 79f1d4e79d
commit 06c58d0b8e
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GPG key ID: D3A4405BE6CC17F4
2 changed files with 21 additions and 21 deletions
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2
.clang-tidy
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@ -16,4 +16,4 @@ AnalyzeTemporaryDtors: false
FormatStyle: file
CheckOptions:
- key: readability-magic-numbers.IgnoredIntegerValues
value: 4;8;16;24;32;1;2;3;4096
value: 4;8;16;24;32;1;2;3;4096;65536

40
src/render.c
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@ -192,40 +192,40 @@ make_circle(int cx, int cy, int radius, uint32_t max_ntraps, xcb_render_trapezoi
double w;
while (k < max_ntraps) {
y1 = (int)(-radius * cos(M_PI * k / max_ntraps));
traps[n].top = (cy + y1) << 16;
traps[n].left.p1.y = (cy + y1) << 16;
traps[n].right.p1.y = (cy + y1) << 16;
traps[n].top = (cy + y1) * 65536;
traps[n].left.p1.y = (cy + y1) * 65536;
traps[n].right.p1.y = (cy + y1) * 65536;
w = sqrt(radius * radius - y1 * y1) * 65536;
traps[n].left.p1.x = (int)((cx << 16) - w);
traps[n].right.p1.x = (int)((cx << 16) + w);
traps[n].left.p1.x = (int)((cx * 65536) - w);
traps[n].right.p1.x = (int)((cx * 65536) + w);
do {
k++;
y2 = (int)(-radius * cos(M_PI * k / max_ntraps));
} while (y1 == y2);
traps[n].bottom = (cy + y2) << 16;
traps[n].left.p2.y = (cy + y2) << 16;
traps[n].right.p2.y = (cy + y2) << 16;
traps[n].bottom = (cy + y2) * 65536;
traps[n].left.p2.y = (cy + y2) * 65536;
traps[n].right.p2.y = (cy + y2) * 65536;
w = sqrt(radius * radius - y2 * y2) * 65536;
traps[n].left.p2.x = (int)((cx << 16) - w);
traps[n].right.p2.x = (int)((cx << 16) + w);
traps[n].left.p2.x = (int)((cx * 65536) - w);
traps[n].right.p2.x = (int)((cx * 65536) + w);
n++;
}
return n;
}
uint32_t make_rectangle(int x, int y, int wid, int hei, xcb_render_trapezoid_t traps[]) {
traps[0].top = y << 16;
traps[0].left.p1.y = y << 16;
traps[0].left.p1.x = x << 16;
traps[0].left.p2.y = (y + hei) << 16;
traps[0].left.p2.x = x << 16;
traps[0].bottom = (y + hei) << 16;
traps[0].right.p1.x = (x + wid) << 16;
traps[0].right.p1.y = y << 16;
traps[0].right.p2.x = (x + wid) << 16;
traps[0].right.p2.y = (y + hei) << 16;
traps[0].top = y * 65536;
traps[0].left.p1.y = y * 65536;
traps[0].left.p1.x = x * 65536;
traps[0].left.p2.y = (y + hei) * 65536;
traps[0].left.p2.x = x * 65536;
traps[0].bottom = (y + hei) * 65536;
traps[0].right.p1.x = (x + wid) * 65536;
traps[0].right.p1.y = y * 65536;
traps[0].right.p2.x = (x + wid) * 65536;
traps[0].right.p2.y = (y + hei) * 65536;
return 1;
}