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Fix #10222: Off by one drawing even-width horizontal/vertical lines

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This commit is contained in:
Jonathan G Rennison
2025-08-17 15:26:23 +01:00
committed by Peter Nelson
parent 80f72d3722
commit add40a2de2
1 changed files with 4 additions and 4 deletions
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8
src/blitter/common.hpp
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@@ -78,11 +78,11 @@ void Blitter::DrawLineGeneric(int x1, int y1, int x2, int y2, int screen_width,
int frac_low = dy - frac_diff / 2; int frac_low = dy - frac_diff / 2;
int frac_high = dy + frac_diff / 2; int frac_high = dy + frac_diff / 2;
while (frac_low < -(dx / 2)) { while (frac_low < -dx) {
frac_low += dx; frac_low += dx;
y_low -= stepy; y_low -= stepy;
} }
while (frac_high >= dx / 2) { while (frac_high >= 0) {
frac_high -= dx; frac_high -= dx;
y_high += stepy; y_high += stepy;
} }
@@ -141,11 +141,11 @@ void Blitter::DrawLineGeneric(int x1, int y1, int x2, int y2, int screen_width,
int frac_low = dx - frac_diff / 2; int frac_low = dx - frac_diff / 2;
int frac_high = dx + frac_diff / 2; int frac_high = dx + frac_diff / 2;
while (frac_low < -(dy / 2)) { while (frac_low < -dy) {
frac_low += dy; frac_low += dy;
x_low -= stepx; x_low -= stepx;
} }
while (frac_high >= dy / 2) { while (frac_high >= 0) {
frac_high -= dy; frac_high -= dy;
x_high += stepx; x_high += stepx;
} }