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[raster] Keep only bottom y-turns.

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This results in noticeable performance improvement.

* src/raster/ftraster.c (Insert_Y_Turns): All bottom y-turns are still
sorted and stored; only the maximum top y-turn is recorded now. The
function is renamed.
(End_Profile): Updated accordingly.
(Convert_Glyph): Reserve space for the top value.
This commit is contained in:
Alexei Podtelezhnikov 2023-11-15 23:41:56 -05:00
parent fa59e0d64c
commit 050a320764
1 changed files with 10 additions and 6 deletions
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16
src/raster/ftraster.c
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@ -116,8 +116,8 @@
* generated until the end of the outline.
*
* Note that, for all generated profiles, the function End_Profile()
* is used to record their bottom-most scanline as well as the
* scanline above its upmost boundary. These positions are called
* is used to record all their bottom-most scanlines as well as the
* scanline above their upmost boundary. These positions are called
* `y-turns' because they (sort of) correspond to local extrema.
* They are stored in a sorted list built from the top of the render
* pool as a downwards stack:
@ -579,12 +579,17 @@
* SUCCESS on success. FAILURE in case of overflow.
*/
static Bool
Insert_Y_Turn( RAS_ARGS Int y )
Insert_Y_Turns( RAS_ARGS Int y,
Int top )
{
Int n = ras.numTurns;
PLong y_turns = ras.maxBuff;
/* update top value */
if ( n == 0 || top > y_turns[n] )
y_turns[n] = top;
/* look for first y value that is <= */
while ( n-- && y < y_turns[n] )
;
@ -751,8 +756,7 @@
p->X = p->x[h - 1];
}
if ( Insert_Y_Turn( RAS_VARS bottom ) ||
Insert_Y_Turn( RAS_VARS top ) )
if ( Insert_Y_Turns( RAS_VARS bottom, top ) )
return FAILURE;
if ( !ras.gProfile )
@ -1820,7 +1824,7 @@
ras.cProfile = NULL;
ras.top = ras.buff;
ras.maxBuff = ras.sizeBuff;
ras.maxBuff = ras.sizeBuff - 1; /* top reserve */
ras.numTurns = 0;
ras.num_Profs = 0;