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exp/draw/x11: mouse location is a signed integer.
R=r CC=golang-dev https://golang.org/cl/2192043
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@ -218,19 +218,18 @@ func (c *conn) readSocket() {
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c.mouseState.Nsec = time.Nanoseconds()
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c.eventc <- c.mouseState
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case 0x06: // Motion notify.
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c.mouseState.Loc.X = int(c.buf[25])<<8 | int(c.buf[24])
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c.mouseState.Loc.Y = int(c.buf[27])<<8 | int(c.buf[26])
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c.mouseState.Loc.X = int(int16(c.buf[25])<<8 | int16(c.buf[24]))
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c.mouseState.Loc.Y = int(int16(c.buf[27])<<8 | int16(c.buf[26]))
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c.mouseState.Nsec = time.Nanoseconds()
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c.eventc <- c.mouseState
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case 0x0c: // Expose.
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// A single user action could trigger multiple expose events (e.g. if moving another
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// window with XShape'd rounded corners over our window). In that case, the X server
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// will send a count (in bytes 16-17) of the number of additional expose events coming.
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// window with XShape'd rounded corners over our window). In that case, the X server will
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// send a uint16 count (in bytes 16-17) of the number of additional expose events coming.
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// We could parse each event for the (x, y, width, height) and maintain a minimal dirty
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// rectangle, but for now, the simplest approach is to paint the entire window, when
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// receiving the final event in the series.
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count := int(c.buf[17])<<8 | int(c.buf[16])
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if count == 0 {
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if c.buf[17] == 0 && c.buf[16] == 0 {
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// TODO(nigeltao): Should we ignore the very first expose event? A freshly mapped window
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// will trigger expose, but until the first c.FlushImage call, there's probably nothing to
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// paint but black. For an 800x600 window, at 4 bytes per pixel, each repaint writes about
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