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window(fill): bounds check end condition for fill
Fixes #65
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src/Window.zig
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src/Window.zig
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if (self.x_off == 0 and self.width == self.screen.width) {
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// we have a full width window, therefore contiguous memory.
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const start = self.y_off * self.width;
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const end = start + (self.height * self.width);
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const end = @min(start + (self.height * self.width), self.screen.buf.len);
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@memset(self.screen.buf[start..end], cell);
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} else {
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// Non-contiguous. Iterate over rows an memset