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freetype2
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Code Issues 4 Releases Wiki Activity

[smooth] Consolidate boundary checks. 

Removing the checks from `gray_hline' shaves 1% off rendering speed.

* src/smooth/ftgrays.c [STANDALONE_]: Duplicate `FT_MIN' and `FT_MAX'.
(gray_TWorker): No need to store `clip_box'.
(gray_hline): Remove unnecessary boundary checks.
(gray_convert_glyph): Move boundary checks from here.
(gray_raster_render): ... to here and consolidate.
This commit is contained in:
Alexei Podtelezhnikov 2016-06-22 23:14:26 -04:00
parent 78e8fc0dad
commit e22334812f
2 changed files with 46 additions and 55 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2016-06-22 Alexei Podtelezhnikov <apodtele@gmail.com>
[smooth] Consolidate boundary checks.
Removing the checks from `gray_hline' shaves 1% off rendering speed.
* src/smooth/ftgrays.c [STANDALONE_]: Duplicate `FT_MIN' and `FT_MAX'.
(gray_TWorker): No need to store `clip_box'.
(gray_hline): Remove unnecessary boundary checks.
(gray_convert_glyph): Move boundary checks from here.
(gray_raster_render): ... to here and consolidate.
2016-06-21 Alexei Podtelezhnikov <apodtele@gmail.com>
[smooth] Use `FT_Outline_Get_CBox'.

89
src/smooth/ftgrays.c
View File

@ -106,6 +106,8 @@
#define FT_BEGIN_STMNT do {
#define FT_END_STMNT } while ( 0 )
#define FT_MIN( a, b ) ( (a) < (b) ? (a) : (b) )
#define FT_MAX( a, b ) ( (a) > (b) ? (a) : (b) )
#define FT_ABS( a ) ( (a) < 0 ? -(a) : (a) )
@ -442,7 +444,6 @@ typedef ptrdiff_t FT_PtrDist;
FT_Outline outline;
FT_Bitmap target;
FT_BBox clip_box;
FT_Span gray_spans[FT_MAX_GRAY_SPANS];
int num_gray_spans;
@ -1373,14 +1374,6 @@ typedef ptrdiff_t FT_PtrDist;
y += (TCoord)ras.min_ey;
x += (TCoord)ras.min_ex;
/* FT_Span.x is a 16-bit short, so limit our coordinates appropriately */
if ( x >= 32767 )
x = 32767;
/* FT_Span.y is an integer, so limit our coordinates appropriately */
if ( y >= FT_INT_MAX )
y = FT_INT_MAX;
if ( coverage )
{
FT_Span* span;
@ -1917,38 +1910,12 @@ typedef ptrdiff_t FT_PtrDist;
static int
gray_convert_glyph( RAS_ARG )
{
FT_BBox cbox;
FT_BBox* clip;
gray_TBand bands[40];
gray_TBand* volatile band;
int volatile n, num_bands;
TPos volatile min, max, max_y;
FT_Outline_Get_CBox( &ras.outline, &cbox );
/* truncate the bounding box to integer pixels */
ras.min_ex = cbox.xMin >> 6;
ras.min_ey = cbox.yMin >> 6;
ras.max_ex = ( cbox.xMax + 63 ) >> 6;
ras.max_ey = ( cbox.yMax + 63 ) >> 6;
/* clip to target bitmap, exit if nothing to do */
clip = &ras.clip_box;
if ( ras.max_ex <= clip->xMin || ras.min_ex >= clip->xMax ||
ras.max_ey <= clip->yMin || ras.min_ey >= clip->yMax )
return 0;
if ( ras.min_ex < clip->xMin ) ras.min_ex = clip->xMin;
if ( ras.min_ey < clip->yMin ) ras.min_ey = clip->yMin;
if ( ras.max_ex > clip->xMax ) ras.max_ex = clip->xMax;
if ( ras.max_ey > clip->yMax ) ras.max_ey = clip->yMax;
ras.count_ex = ras.max_ex - ras.min_ex;
ras.count_ey = ras.max_ey - ras.min_ey;
/* set up vertical bands */
num_bands = (int)( ( ras.max_ey - ras.min_ey ) / ras.band_size );
if ( num_bands == 0 )
@ -2047,6 +2014,7 @@ typedef ptrdiff_t FT_PtrDist;
{
const FT_Outline* outline = (const FT_Outline*)params->source;
const FT_Bitmap* target_map = params->target;
FT_BBox cbox, clip;
gray_TWorker worker[1];
@ -2088,39 +2056,50 @@ typedef ptrdiff_t FT_PtrDist;
if ( !( params->flags & FT_RASTER_FLAG_AA ) )
return FT_THROW( Invalid_Mode );
FT_Outline_Get_CBox( outline, &cbox );
/* reject too large outline coordinates */
{
FT_Vector* vec = outline->points;
FT_Vector* limit = vec + outline->n_points;
if ( cbox.xMin < -0x1000000L || cbox.xMax > 0x1000000L ||
cbox.yMin < -0x1000000L || cbox.yMax > 0x1000000L )
return FT_THROW( Invalid_Outline );
for ( ; vec < limit; vec++ )
{
if ( vec->x < -0x1000000L || vec->x > 0x1000000L ||
vec->y < -0x1000000L || vec->y > 0x1000000L )
return FT_THROW( Invalid_Outline );
}
}
/* truncate the bounding box to integer pixels */
cbox.xMin = cbox.xMin >> 6;
cbox.yMin = cbox.yMin >> 6;
cbox.xMax = ( cbox.xMax + 63 ) >> 6;
cbox.yMax = ( cbox.yMax + 63 ) >> 6;
/* compute clipping box */
if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
{
/* compute clip box from target pixmap */
ras.clip_box.xMin = 0;
ras.clip_box.yMin = 0;
ras.clip_box.xMax = (FT_Pos)target_map->width;
ras.clip_box.yMax = (FT_Pos)target_map->rows;
clip.xMin = 0;
clip.yMin = 0;
clip.xMax = (FT_Pos)target_map->width;
clip.yMax = (FT_Pos)target_map->rows;
}
else if ( params->flags & FT_RASTER_FLAG_CLIP )
ras.clip_box = params->clip_box;
clip = params->clip_box;
else
{
ras.clip_box.xMin = -32768L;
ras.clip_box.yMin = -32768L;
ras.clip_box.xMax = 32767L;
ras.clip_box.yMax = 32767L;
clip.xMin = -32768L;
clip.yMin = -32768L;
clip.xMax = 32767L;
clip.yMax = 32767L;
}
/* clip to target bitmap, exit if nothing to do */
ras.min_ex = FT_MAX( cbox.xMin, clip.xMin );
ras.min_ey = FT_MAX( cbox.yMin, clip.yMin );
ras.max_ex = FT_MIN( cbox.xMax, clip.xMax );
ras.max_ey = FT_MIN( cbox.yMax, clip.yMax );
if ( ras.max_ex <= ras.min_ex || ras.max_ey <= ras.min_ey )
return 0;
ras.count_ex = ras.max_ex - ras.min_ex;
ras.count_ey = ras.max_ey - ras.min_ey;
gray_init_cells( RAS_VAR_ buffer, sizeof ( buffer ) );
ras.outline = *outline;