Function GfxPreprocessLine

src/gfx.cpp:378–391

* Align parameters of a line to the given DPI and check simple clipping. * @param dpi Screen parameters to align with. * @param x X coordinate of first point. * @param y Y coordinate of first point. * @param x2 X coordinate of second point. * @param y2 Y coordinate of second point. * @param width Width of the line. * @return True if the line is likely to be visible, false if it's certainly

 *         invisible.
 */
static inline bool GfxPreprocessLine(DrawPixelInfo *dpi, int &x, int &y, int &x2, int &y2, int width)
{
	x -= dpi->left;
	x2 -= dpi->left;
	y -= dpi->top;
	y2 -= dpi->top;

	/* Check simple clipping */
	if (x + width / 2 < 0           && x2 + width / 2 < 0          ) return false;
	if (y + width / 2 < 0           && y2 + width / 2 < 0          ) return false;
	if (x - width / 2 > dpi->width  && x2 - width / 2 > dpi->width ) return false;
	if (y - width / 2 > dpi->height && y2 - width / 2 > dpi->height) return false;
	return true;
}

void GfxDrawLine(int x, int y, int x2, int y2, PixelColour colour, int width, int dash)
{