//*****************************************************************************
//
//! Draws a horizontal line.
//!
//! \param pContext is a pointer to the drawing context to use.
//! \param i32X1 is the X coordinate of one end of the line.
//! \param i32X2 is the X coordinate of the other end of the line.
//! \param i32Y is the Y coordinate of the line.
//!
//! This function draws a horizontal line, taking advantage of the fact that
//! the line is horizontal to draw it more efficiently. The clipping of the
//! horizontal line to the clipping rectangle is performed within this routine;
//! the display driver's horizontal line routine is used to perform the actual
//! line drawing.
//!
//! \return None.
//
//*****************************************************************************
void
GrLineDrawH(const tContext *pContext, int32_t i32X1, int32_t i32X2,
int32_t i32Y)
{
int32_t i32Temp;
//
// Check the arguments.
//
ASSERT(pContext);
//
// If the Y coordinate of this line is not in the clipping region, then
// there is nothing to be done.
//
if((i32Y < pContext->sClipRegion.i16YMin) ||
(i32Y > pContext->sClipRegion.i16YMax))
{
return;
}
//
// Swap the X coordinates if the first is larger than the second.
//
if(i32X1 > i32X2)
{
i32Temp = i32X1;
i32X1 = i32X2;
i32X2 = i32Temp;
}
//
// If the entire line is outside the clipping region, then there is nothing
// to be done.
//
if((i32X1 > pContext->sClipRegion.i16XMax) ||
(i32X2 < pContext->sClipRegion.i16XMin))
{
return;
}
//
// Clip the starting coordinate to the left side of the clipping region if
// required.
//
if(i32X1 < pContext->sClipRegion.i16XMin)
{
i32X1 = pContext->sClipRegion.i16XMin;
}
//
// Clip the ending coordinate to the right side of the clipping region if
// required.
//
if(i32X2 > pContext->sClipRegion.i16XMax)
{
i32X2 = pContext->sClipRegion.i16XMax;
}
//
// Call the low level horizontal line drawing routine.
//
DpyLineDrawH(pContext->psDisplay, i32X1, i32X2, i32Y,
pContext->ui32Foreground);
}
//*****************************************************************************
//
//! Draws a horizontal line.
//!
//! \param pContext is a pointer to the drawing context to use.
//! \param lX1 is the X coordinate of one end of the line.
//! \param lX2 is the X coordinate of the other end of the line.
//! \param lY is the Y coordinate of the line.
//!
//! This function draws a horizontal line, taking advantage of the fact that
//! the line is horizontal to draw it more efficiently. The clipping of the
//! horizontal line to the clipping rectangle is performed within this routine;
//! the display driver's horizontal line routine is used to perform the actual
//! line drawing.
//!
//! \return None.
//
//*****************************************************************************
void
GrLineDrawH(const tContext *pContext, long lX1, long lX2, long lY)
{
long lTemp;
//
// Check the arguments.
//
ASSERT(pContext);
//
// If the Y coordinate of this line is not in the clipping region, then
// there is nothing to be done.
//
if((lY < pContext->sClipRegion.sYMin) ||
(lY > pContext->sClipRegion.sYMax))
{
return;
}
//
// Swap the X coordinates if the first is larger than the second.
//
if(lX1 > lX2)
{
lTemp = lX1;
lX1 = lX2;
lX2 = lTemp;
}
//
// If the entire line is outside the clipping region, then there is nothing
// to be done.
//
if((lX1 > pContext->sClipRegion.sXMax) ||
(lX2 < pContext->sClipRegion.sXMin))
{
return;
}
//
// Clip the starting coordinate to the left side of the clipping region if
// required.
//
if(lX1 < pContext->sClipRegion.sXMin)
{
lX1 = pContext->sClipRegion.sXMin;
}
//
// Clip the ending coordinate to the right side of the clipping region if
// required.
//
if(lX2 > pContext->sClipRegion.sXMax)
{
lX2 = pContext->sClipRegion.sXMax;
}
//
// Call the low level horizontal line drawing routine.
//
DpyLineDrawH(pContext->pDisplay, lX1, lX2, lY, pContext->ulForeground);
}
