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[raster] Simplify sweeping entry and exit.

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* src/raster/ftraster.c (Draw_Sweep): Use y-turns to set the range,
correctly set the initial position, directly loop through y_turns,
and remove a 5-gray remnant at exit.
This commit is contained in:
Alexei Podtelezhnikov 2023-10-30 22:46:32 -04:00
parent 55d0287cfc
commit 4e2d1f040c
1 changed files with 13 additions and 41 deletions
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54
src/raster/ftraster.c
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@ -2604,67 +2604,46 @@
static Bool
Draw_Sweep( RAS_ARG )
{
Int min_Y, max_Y, top, bottom, dropouts;
Int min_Y, max_Y, dropouts;
Int y, y_change, y_height;
PProfile P, Q, P_Left, P_Right;
Long x1, x2, xs, e1, e2;
TProfileList waiting = NULL;
TProfileList waiting = ras.fProfile;
TProfileList draw_left = NULL;
TProfileList draw_right = NULL;
/* first, compute min and max Y */
/* use y_turns to set the drawing range */
P = ras.fProfile;
max_Y = (Int)TRUNC( ras.minY );
min_Y = (Int)TRUNC( ras.maxY );
while ( P )
{
Q = P->link;
bottom = P->start;
top = P->start + P->height - 1;
if ( min_Y > bottom )
min_Y = bottom;
if ( max_Y < top )
max_Y = top;
P->X = 0;
InsNew( &waiting, P );
P = Q;
}
min_Y = (Int)ras.maxBuff[0];
max_Y = (Int)ras.sizeBuff[-1] - 1;
/* now initialize the sweep */
ras.Proc_Sweep_Init( RAS_VARS min_Y, max_Y );
/* then compute the distance of each profile from min_Y */
/* set the activation countdowns and the initial positions */
P = waiting;
while ( P )
{
P->countL = P->start - min_Y;
P->X = P->x[P->offset];
P = P->link;
}
/* let's go */
/* let's go, iterating through y_turns */
y = min_Y;
y_height = 0;
if ( ras.sizeBuff[-ras.numTurns] == min_Y )
ras.numTurns--;
while ( ras.numTurns > 0 )
while ( ++ras.maxBuff < ras.sizeBuff )
{
/* check waiting list for new activations */
/* check waiting list for new profile activations */
P = waiting;
@ -2690,7 +2669,7 @@
Sort( &draw_left );
Sort( &draw_right );
y_change = (Int)ras.sizeBuff[-ras.numTurns--];
y_change = (Int)*ras.maxBuff;
y_height = y_change - y;
while ( y < y_change )
@ -2768,7 +2747,7 @@
}
}
/* now finalize the profiles that need it */
/* remove exhausted profiles */
P = draw_left;
while ( P )
@ -2789,13 +2768,6 @@
}
}
/* for gray-scaling, flush the bitmap scanline cache */
while ( y <= max_Y )
{
ras.Proc_Sweep_Step( RAS_VAR );
y++;
}
return SUCCESS;
Scan_DropOuts: