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-rw-r--r--src/smooth/ftgrays.c1071
1 files changed, 436 insertions, 635 deletions
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index 9a43c07..30fd4e2 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -4,7 +4,7 @@
/* */
/* A new `perfect' anti-aliasing renderer (body). */
/* */
-/* Copyright 2000-2015 by */
+/* Copyright 2000-2016 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@@ -18,7 +18,7 @@
/*************************************************************************/
/* */
/* This file can be compiled without the rest of the FreeType engine, by */
- /* defining the _STANDALONE_ macro when compiling it. You also need to */
+ /* defining the STANDALONE_ macro when compiling it. You also need to */
/* put the files `ftgrays.h' and `ftimage.h' into the current */
/* compilation directory. Typically, you could do something like */
/* */
@@ -27,9 +27,9 @@
/* - copy `include/freetype/ftimage.h' and `src/smooth/ftgrays.h' to the */
/* same directory */
/* */
- /* - compile `ftgrays' with the _STANDALONE_ macro defined, as in */
+ /* - compile `ftgrays' with the STANDALONE_ macro defined, as in */
/* */
- /* cc -c -D_STANDALONE_ ftgrays.c */
+ /* cc -c -DSTANDALONE_ ftgrays.c */
/* */
/* The renderer can be initialized with a call to */
/* `ft_gray_raster.raster_new'; an anti-aliased bitmap can be generated */
@@ -91,7 +91,7 @@
#define FT_COMPONENT trace_smooth
-#ifdef _STANDALONE_
+#ifdef STANDALONE_
/* The size in bytes of the render pool used by the scan-line converter */
@@ -106,6 +106,7 @@
#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) )
@@ -256,7 +257,7 @@ typedef ptrdiff_t FT_PtrDist;
};
-#else /* !_STANDALONE_ */
+#else /* !STANDALONE_ */
#include <ft2build.h>
@@ -274,7 +275,7 @@ typedef ptrdiff_t FT_PtrDist;
#define ErrRaster_Memory_Overflow Smooth_Err_Out_Of_Memory
-#endif /* !_STANDALONE_ */
+#endif /* !STANDALONE_ */
#ifndef FT_MEM_SET
@@ -302,7 +303,7 @@ typedef ptrdiff_t FT_PtrDist;
#else /* FT_STATIC_RASTER */
-#define RAS_ARG /* empty */
+#define RAS_ARG void
#define RAS_ARG_ /* empty */
#define RAS_VAR /* empty */
#define RAS_VAR_ /* empty */
@@ -318,19 +319,19 @@ typedef ptrdiff_t FT_PtrDist;
#undef TRUNC
#undef SCALED
-#define ONE_PIXEL ( 1L << PIXEL_BITS )
+#define ONE_PIXEL ( 1 << PIXEL_BITS )
#define TRUNC( x ) ( (TCoord)( (x) >> PIXEL_BITS ) )
-#define SUBPIXELS( x ) ( (TPos)(x) << PIXEL_BITS )
+#define SUBPIXELS( x ) ( (TPos)(x) * ONE_PIXEL )
#define FLOOR( x ) ( (x) & -ONE_PIXEL )
#define CEILING( x ) ( ( (x) + ONE_PIXEL - 1 ) & -ONE_PIXEL )
#define ROUND( x ) ( ( (x) + ONE_PIXEL / 2 ) & -ONE_PIXEL )
#if PIXEL_BITS >= 6
-#define UPSCALE( x ) ( (x) << ( PIXEL_BITS - 6 ) )
+#define UPSCALE( x ) ( (x) * ( ONE_PIXEL >> 6 ) )
#define DOWNSCALE( x ) ( (x) >> ( PIXEL_BITS - 6 ) )
#else
#define UPSCALE( x ) ( (x) >> ( 6 - PIXEL_BITS ) )
-#define DOWNSCALE( x ) ( (x) << ( 6 - PIXEL_BITS ) )
+#define DOWNSCALE( x ) ( (x) * ( 64 >> PIXEL_BITS ) )
#endif
@@ -369,7 +370,7 @@ typedef ptrdiff_t FT_PtrDist;
/* These macros speed up repetitive divisions by replacing them */
- /* with multiplications and right shifts. */
+ /* with multiplications and right shifts. */
#define FT_UDIVPREP( b ) \
long b ## _r = (long)( FT_ULONG_MAX >> PIXEL_BITS ) / ( b )
#define FT_UDIV( a, b ) \
@@ -386,44 +387,36 @@ typedef ptrdiff_t FT_PtrDist;
/* need to define them to "float" or "double" when experimenting with */
/* new algorithms */
- typedef long TCoord; /* integer scanline/pixel coordinate */
typedef long TPos; /* sub-pixel coordinate */
-
- /* determine the type used to store cell areas. This normally takes at */
- /* least PIXEL_BITS*2 + 1 bits. On 16-bit systems, we need to use */
- /* `long' instead of `int', otherwise bad things happen */
-
-#if PIXEL_BITS <= 7
-
- typedef int TArea;
-
-#else /* PIXEL_BITS >= 8 */
-
- /* approximately determine the size of integers using an ANSI-C header */
-#if FT_UINT_MAX == 0xFFFFU
- typedef long TArea;
-#else
- typedef int TArea;
-#endif
-
-#endif /* PIXEL_BITS >= 8 */
-
-
- /* maximum number of gray spans in a call to the span callback */
-#define FT_MAX_GRAY_SPANS 32
+ typedef int TCoord; /* integer scanline/pixel coordinate */
+ typedef int TArea; /* cell areas, coordinate products */
typedef struct TCell_* PCell;
typedef struct TCell_
{
- TPos x; /* same with gray_TWorker.ex */
+ TCoord x; /* same with gray_TWorker.ex */
TCoord cover; /* same with gray_TWorker.cover */
TArea area;
PCell next;
} TCell;
+ typedef struct TPixmap_
+ {
+ unsigned char* origin; /* pixmap origin at the bottom-left */
+ int pitch; /* pitch to go down one row */
+
+ } TPixmap;
+
+ /* maximum number of gray cells in the buffer */
+#if FT_RENDER_POOL_SIZE > 2048
+#define FT_MAX_GRAY_POOL ( FT_RENDER_POOL_SIZE / sizeof ( TCell ) )
+#else
+#define FT_MAX_GRAY_POOL ( 2048 / sizeof ( TCell ) )
+#endif
+
#if defined( _MSC_VER ) /* Visual C++ (and Intel C++) */
/* We disable the warning `structure was padded due to */
@@ -438,9 +431,8 @@ typedef ptrdiff_t FT_PtrDist;
ft_jmp_buf jump_buffer;
TCoord ex, ey;
- TPos min_ex, max_ex;
- TPos min_ey, max_ey;
- TPos count_ex, count_ey;
+ TCoord min_ex, max_ex;
+ TCoord min_ey, max_ey;
TArea area;
TCoord cover;
@@ -452,28 +444,13 @@ typedef ptrdiff_t FT_PtrDist;
TPos x, y;
- FT_Vector bez_stack[32 * 3 + 1];
- int lev_stack[32];
-
FT_Outline outline;
- FT_Bitmap target;
- FT_BBox clip_box;
-
- FT_Span gray_spans[FT_MAX_GRAY_SPANS];
- int num_gray_spans;
+ TPixmap target;
FT_Raster_Span_Func render_span;
void* render_span_data;
- int span_y;
-
- int band_size;
- int band_shoot;
-
- void* buffer;
- long buffer_size;
PCell* ycells;
- TPos ycount;
} gray_TWorker, *gray_PWorker;
@@ -496,71 +473,32 @@ typedef ptrdiff_t FT_PtrDist;
} gray_TRaster, *gray_PRaster;
+#ifdef FT_DEBUG_LEVEL_TRACE
- /*************************************************************************/
- /* */
- /* Initialize the cells table. */
- /* */
- static void
- gray_init_cells( RAS_ARG_ void* buffer,
- long byte_size )
- {
- ras.buffer = buffer;
- ras.buffer_size = byte_size;
-
- ras.ycells = (PCell*) buffer;
- ras.cells = NULL;
- ras.max_cells = 0;
- ras.num_cells = 0;
- ras.area = 0;
- ras.cover = 0;
- ras.invalid = 1;
- }
-
-
- /*************************************************************************/
- /* */
- /* Compute the outline bounding box. */
- /* */
+ /* to be called while in the debugger -- */
+ /* this function causes a compiler warning since it is unused otherwise */
static void
- gray_compute_cbox( RAS_ARG )
+ gray_dump_cells( RAS_ARG )
{
- FT_Outline* outline = &ras.outline;
- FT_Vector* vec = outline->points;
- FT_Vector* limit = vec + outline->n_points;
+ int y;
- if ( outline->n_points <= 0 )
+ for ( y = ras.min_ey; y < ras.max_ey; y++ )
{
- ras.min_ex = ras.max_ex = 0;
- ras.min_ey = ras.max_ey = 0;
- return;
- }
-
- ras.min_ex = ras.max_ex = vec->x;
- ras.min_ey = ras.max_ey = vec->y;
+ PCell cell = ras.ycells[y - ras.min_ey];
- vec++;
-
- for ( ; vec < limit; vec++ )
- {
- TPos x = vec->x;
- TPos y = vec->y;
+ printf( "%3d:", y );
- if ( x < ras.min_ex ) ras.min_ex = x;
- if ( x > ras.max_ex ) ras.max_ex = x;
- if ( y < ras.min_ey ) ras.min_ey = y;
- if ( y > ras.max_ey ) ras.max_ey = y;
+ for ( ; cell != NULL; cell = cell->next )
+ printf( " (%3d, c:%4d, a:%6d)",
+ cell->x, cell->cover, cell->area );
+ printf( "\n" );
}
-
- /* truncate the bounding box to integer pixels */
- ras.min_ex = ras.min_ex >> 6;
- ras.min_ey = ras.min_ey >> 6;
- ras.max_ex = ( ras.max_ex + 63 ) >> 6;
- ras.max_ey = ( ras.max_ey + 63 ) >> 6;
}
+#endif /* FT_DEBUG_LEVEL_TRACE */
+
/*************************************************************************/
/* */
@@ -570,13 +508,10 @@ typedef ptrdiff_t FT_PtrDist;
gray_find_cell( RAS_ARG )
{
PCell *pcell, cell;
- TPos x = ras.ex;
-
+ TCoord x = ras.ex;
- if ( x > ras.count_ex )
- x = ras.count_ex;
- pcell = &ras.ycells[ras.ey];
+ pcell = &ras.ycells[ras.ey - ras.min_ey];
for (;;)
{
cell = *pcell;
@@ -639,57 +574,25 @@ typedef ptrdiff_t FT_PtrDist;
/* All cells that are on the left of the clipping region go to the */
/* min_ex - 1 horizontal position. */
- ey -= ras.min_ey;
-
- if ( ex > ras.max_ex )
- ex = ras.max_ex;
- ex -= ras.min_ex;
- if ( ex < 0 )
- ex = -1;
+ if ( ex < ras.min_ex )
+ ex = ras.min_ex - 1;
- /* are we moving to a different cell ? */
- if ( ex != ras.ex || ey != ras.ey )
- {
- /* record the current one if it is valid */
- if ( !ras.invalid )
- gray_record_cell( RAS_VAR );
+ /* record the current one if it is valid */
+ if ( !ras.invalid )
+ gray_record_cell( RAS_VAR );
- ras.area = 0;
- ras.cover = 0;
- ras.ex = ex;
- ras.ey = ey;
- }
+ ras.area = 0;
+ ras.cover = 0;
+ ras.ex = ex;
+ ras.ey = ey;
- ras.invalid = ( (unsigned int)ey >= (unsigned int)ras.count_ey ||
- ex >= ras.count_ex );
+ ras.invalid = ( ey >= ras.max_ey || ey < ras.min_ey ||
+ ex >= ras.max_ex );
}
- /*************************************************************************/
- /* */
- /* Start a new contour at a given cell. */
- /* */
- static void
- gray_start_cell( RAS_ARG_ TCoord ex,
- TCoord ey )
- {
- if ( ex > ras.max_ex )
- ex = (TCoord)( ras.max_ex );
-
- if ( ex < ras.min_ex )
- ex = (TCoord)( ras.min_ex - 1 );
-
- ras.area = 0;
- ras.cover = 0;
- ras.ex = ex - ras.min_ex;
- ras.ey = ey - ras.min_ey;
- ras.invalid = 0;
-
- gray_set_cell( RAS_VAR_ ex, ey );
- }
-
-#if 0
+#ifndef FT_LONG64
/*************************************************************************/
/* */
@@ -702,17 +605,13 @@ typedef ptrdiff_t FT_PtrDist;
TPos x2,
TCoord y2 )
{
- TCoord ex1, ex2, fx1, fx2, delta, mod;
- long p, first, dx;
+ TCoord ex1, ex2, fx1, fx2, first, delta, mod;
+ TPos p, dx;
int incr;
- dx = x2 - x1;
-
ex1 = TRUNC( x1 );
ex2 = TRUNC( x2 );
- fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) );
- fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) );
/* trivial case. Happens often */
if ( y1 == y2 )
@@ -721,11 +620,14 @@ typedef ptrdiff_t FT_PtrDist;
return;
}
+ fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) );
+ fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) );
+ delta = y2 - y1;
+
/* everything is located in a single cell. That is easy! */
/* */
if ( ex1 == ex2 )
{
- delta = y2 - y1;
ras.area += (TArea)(( fx1 + fx2 ) * delta);
ras.cover += delta;
return;
@@ -734,13 +636,17 @@ typedef ptrdiff_t FT_PtrDist;
/* ok, we'll have to render a run of adjacent cells on the same */
/* scanline... */
/* */
- p = ( ONE_PIXEL - fx1 ) * ( y2 - y1 );
- first = ONE_PIXEL;
- incr = 1;
+ dx = x2 - x1;
- if ( dx < 0 )
+ if ( dx > 0 )
{
- p = fx1 * ( y2 - y1 );
+ p = ( ONE_PIXEL - fx1 ) * delta;
+ first = ONE_PIXEL;
+ incr = 1;
+ }
+ else
+ {
+ p = fx1 * delta;
first = 0;
incr = -1;
dx = -dx;
@@ -797,25 +703,22 @@ typedef ptrdiff_t FT_PtrDist;
gray_render_line( RAS_ARG_ TPos to_x,
TPos to_y )
{
- TCoord ey1, ey2, fy1, fy2, mod;
- TPos dx, dy, x, x2;
- long p, first;
- int delta, rem, lift, incr;
+ TCoord ey1, ey2, fy1, fy2, first, delta, mod;
+ TPos p, dx, dy, x, x2;
+ int incr;
ey1 = TRUNC( ras.y );
ey2 = TRUNC( to_y ); /* if (ey2 >= ras.max_ey) ey2 = ras.max_ey-1; */
- fy1 = (TCoord)( ras.y - SUBPIXELS( ey1 ) );
- fy2 = (TCoord)( to_y - SUBPIXELS( ey2 ) );
-
- dx = to_x - ras.x;
- dy = to_y - ras.y;
/* perform vertical clipping */
if ( ( ey1 >= ras.max_ey && ey2 >= ras.max_ey ) ||
( ey1 < ras.min_ey && ey2 < ras.min_ey ) )
goto End;
+ fy1 = (TCoord)( ras.y - SUBPIXELS( ey1 ) );
+ fy2 = (TCoord)( to_y - SUBPIXELS( ey2 ) );
+
/* everything is on a single scanline */
if ( ey1 == ey2 )
{
@@ -823,9 +726,10 @@ typedef ptrdiff_t FT_PtrDist;
goto End;
}
- /* vertical line - avoid calling gray_render_scanline */
- incr = 1;
+ dx = to_x - ras.x;
+ dy = to_y - ras.y;
+ /* vertical line - avoid calling gray_render_scanline */
if ( dx == 0 )
{
TCoord ex = TRUNC( ras.x );
@@ -833,21 +737,25 @@ typedef ptrdiff_t FT_PtrDist;
TArea area;
- first = ONE_PIXEL;
- if ( dy < 0 )
+ if ( dy > 0)
+ {
+ first = ONE_PIXEL;
+ incr = 1;
+ }
+ else
{
first = 0;
incr = -1;
}
- delta = (int)( first - fy1 );
+ delta = first - fy1;
ras.area += (TArea)two_fx * delta;
ras.cover += delta;
ey1 += incr;
gray_set_cell( RAS_VAR_ ex, ey1 );
- delta = (int)( first + first - ONE_PIXEL );
+ delta = first + first - ONE_PIXEL;
area = (TArea)two_fx * delta;
while ( ey1 != ey2 )
{
@@ -858,7 +766,7 @@ typedef ptrdiff_t FT_PtrDist;
gray_set_cell( RAS_VAR_ ex, ey1 );
}
- delta = (int)( fy2 - ONE_PIXEL + first );
+ delta = fy2 - ONE_PIXEL + first;
ras.area += (TArea)two_fx * delta;
ras.cover += delta;
@@ -866,11 +774,13 @@ typedef ptrdiff_t FT_PtrDist;
}
/* ok, we have to render several scanlines */
- p = ( ONE_PIXEL - fy1 ) * dx;
- first = ONE_PIXEL;
- incr = 1;
-
- if ( dy < 0 )
+ if ( dy > 0)
+ {
+ p = ( ONE_PIXEL - fy1 ) * dx;
+ first = ONE_PIXEL;
+ incr = 1;
+ }
+ else
{
p = fy1 * dx;
first = 0;
@@ -878,19 +788,22 @@ typedef ptrdiff_t FT_PtrDist;
dy = -dy;
}
- FT_DIV_MOD( int, p, dy, delta, mod );
+ FT_DIV_MOD( TCoord, p, dy, delta, mod );
x = ras.x + delta;
- gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, (TCoord)first );
+ gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, first );
ey1 += incr;
gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );
if ( ey1 != ey2 )
{
- p = ONE_PIXEL * dx;
- FT_DIV_MOD( int, p, dy, lift, rem );
- mod -= (int)dy;
+ TCoord lift, rem;
+
+
+ p = ONE_PIXEL * dx;
+ FT_DIV_MOD( TCoord, p, dy, lift, rem );
+ mod -= (TCoord)dy;
do
{
@@ -898,14 +811,14 @@ typedef ptrdiff_t FT_PtrDist;
mod += rem;
if ( mod >= 0 )
{
- mod -= (int)dy;
+ mod -= (TCoord)dy;
delta++;
}
x2 = x + delta;
- gray_render_scanline( RAS_VAR_ ey1, x,
- (TCoord)( ONE_PIXEL - first ), x2,
- (TCoord)first );
+ gray_render_scanline( RAS_VAR_ ey1,
+ x, ONE_PIXEL - first,
+ x2, first );
x = x2;
ey1 += incr;
@@ -913,9 +826,9 @@ typedef ptrdiff_t FT_PtrDist;
} while ( ey1 != ey2 );
}
- gray_render_scanline( RAS_VAR_ ey1, x,
- (TCoord)( ONE_PIXEL - first ), to_x,
- fy2 );
+ gray_render_scanline( RAS_VAR_ ey1,
+ x, ONE_PIXEL - first,
+ to_x, fy2 );
End:
ras.x = to_x;
@@ -936,8 +849,6 @@ typedef ptrdiff_t FT_PtrDist;
TCoord ex1, ex2, ey1, ey2;
- ex1 = TRUNC( ras.x );
- ex2 = TRUNC( to_x );
ey1 = TRUNC( ras.y );
ey2 = TRUNC( to_y );
@@ -946,12 +857,15 @@ typedef ptrdiff_t FT_PtrDist;
( ey1 < ras.min_ey && ey2 < ras.min_ey ) )
goto End;
- dx = to_x - ras.x;
- dy = to_y - ras.y;
+ ex1 = TRUNC( ras.x );
+ ex2 = TRUNC( to_x );
fx1 = ras.x - SUBPIXELS( ex1 );
fy1 = ras.y - SUBPIXELS( ey1 );
+ dx = to_x - ras.x;
+ dy = to_y - ras.y;
+
if ( ex1 == ex2 && ey1 == ey2 ) /* inside one cell */
;
else if ( dy == 0 ) /* ex1 != ex2 */ /* any horizontal line */
@@ -984,7 +898,7 @@ typedef ptrdiff_t FT_PtrDist;
}
else /* any other line */
{
- TArea prod = dx * fy1 - dy * fx1;
+ TPos prod = dx * fy1 - dy * fx1;
FT_UDIVPREP( dx );
FT_UDIVPREP( dy );
@@ -1084,73 +998,64 @@ typedef ptrdiff_t FT_PtrDist;
gray_render_conic( RAS_ARG_ const FT_Vector* control,
const FT_Vector* to )
{
+ FT_Vector bez_stack[16 * 2 + 1]; /* enough to accommodate bisections */
+ FT_Vector* arc = bez_stack;
TPos dx, dy;
- TPos min, max, y;
- int top, level;
- int* levels;
- FT_Vector* arc;
-
+ int draw, split;
- levels = ras.lev_stack;
- arc = ras.bez_stack;
arc[0].x = UPSCALE( to->x );
arc[0].y = UPSCALE( to->y );
arc[1].x = UPSCALE( control->x );
arc[1].y = UPSCALE( control->y );
arc[2].x = ras.x;
arc[2].y = ras.y;
- top = 0;
+
+ /* short-cut the arc that crosses the current band */
+ if ( ( TRUNC( arc[0].y ) >= ras.max_ey &&
+ TRUNC( arc[1].y ) >= ras.max_ey &&
+ TRUNC( arc[2].y ) >= ras.max_ey ) ||
+ ( TRUNC( arc[0].y ) < ras.min_ey &&
+ TRUNC( arc[1].y ) < ras.min_ey &&
+ TRUNC( arc[2].y ) < ras.min_ey ) )
+ {
+ ras.x = arc[0].x;
+ ras.y = arc[0].y;
+ return;
+ }
dx = FT_ABS( arc[2].x + arc[0].x - 2 * arc[1].x );
dy = FT_ABS( arc[2].y + arc[0].y - 2 * arc[1].y );
if ( dx < dy )
dx = dy;
- if ( dx < ONE_PIXEL / 4 )
- goto Draw;
-
- /* short-cut the arc that crosses the current band */
- min = max = arc[0].y;
-
- y = arc[1].y;
- if ( y < min ) min = y;
- if ( y > max ) max = y;
-
- y = arc[2].y;
- if ( y < min ) min = y;
- if ( y > max ) max = y;
-
- if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < ras.min_ey )
- goto Draw;
-
- level = 0;
- do
+ /* We can calculate the number of necessary bisections because */
+ /* each bisection predictably reduces deviation exactly 4-fold. */
+ /* Even 32-bit deviation would vanish after 16 bisections. */
+ draw = 1;
+ while ( dx > ONE_PIXEL / 4 )
{
- dx >>= 2;
- level++;
- } while ( dx > ONE_PIXEL / 4 );
-
- levels[0] = level;
+ dx >>= 2;
+ draw <<= 1;
+ }
+ /* We use decrement counter to count the total number of segments */
+ /* to draw starting from 2^level. Before each draw we split as */
+ /* many times as there are trailing zeros in the counter. */
do
{
- level = levels[top];
- if ( level > 0 )
+ split = 1;
+ while ( ( draw & split ) == 0 )
{
gray_split_conic( arc );
arc += 2;
- top++;
- levels[top] = levels[top - 1] = level - 1;
- continue;
+ split <<= 1;
}
- Draw:
gray_render_line( RAS_VAR_ arc[0].x, arc[0].y );
- top--;
arc -= 2;
- } while ( top >= 0 );
+ } while ( --draw );
}
@@ -1187,11 +1092,13 @@ typedef ptrdiff_t FT_PtrDist;
const FT_Vector* control2,
const FT_Vector* to )
{
- FT_Vector* arc;
- TPos min, max, y;
+ FT_Vector bez_stack[16 * 3 + 1]; /* enough to accommodate bisections */
+ FT_Vector* arc = bez_stack;
+ TPos dx, dy, dx_, dy_;
+ TPos dx1, dy1, dx2, dy2;
+ TPos L, s, s_limit;
- arc = ras.bez_stack;
arc[0].x = UPSCALE( to->x );
arc[0].y = UPSCALE( to->y );
arc[1].x = UPSCALE( control2->x );
@@ -1201,29 +1108,20 @@ typedef ptrdiff_t FT_PtrDist;
arc[3].x = ras.x;
arc[3].y = ras.y;
- /* Short-cut the arc that crosses the current band. */
- min = max = arc[0].y;
-
- y = arc[1].y;
- if ( y < min )
- min = y;
- if ( y > max )
- max = y;
-
- y = arc[2].y;
- if ( y < min )
- min = y;
- if ( y > max )
- max = y;
-
- y = arc[3].y;
- if ( y < min )
- min = y;
- if ( y > max )
- max = y;
-
- if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < ras.min_ey )
- goto Draw;
+ /* short-cut the arc that crosses the current band */
+ if ( ( TRUNC( arc[0].y ) >= ras.max_ey &&
+ TRUNC( arc[1].y ) >= ras.max_ey &&
+ TRUNC( arc[2].y ) >= ras.max_ey &&
+ TRUNC( arc[3].y ) >= ras.max_ey ) ||
+ ( TRUNC( arc[0].y ) < ras.min_ey &&
+ TRUNC( arc[1].y ) < ras.min_ey &&
+ TRUNC( arc[2].y ) < ras.min_ey &&
+ TRUNC( arc[3].y ) < ras.min_ey ) )
+ {
+ ras.x = arc[0].x;
+ ras.y = arc[0].y;
+ return;
+ }
for (;;)
{
@@ -1232,64 +1130,53 @@ typedef ptrdiff_t FT_PtrDist;
/* F. Hain, at */
/* http://www.cis.southalabama.edu/~hain/general/Publications/Bezier/Camera-ready%20CISST02%202.pdf */
- {
- TPos dx, dy, dx_, dy_;
- TPos dx1, dy1, dx2, dy2;
- TPos L, s, s_limit;
+ /* dx and dy are x and y components of the P0-P3 chord vector. */
+ dx = dx_ = arc[3].x - arc[0].x;
+ dy = dy_ = arc[3].y - arc[0].y;
+ L = FT_HYPOT( dx_, dy_ );
- /* dx and dy are x and y components of the P0-P3 chord vector. */
- dx = dx_ = arc[3].x - arc[0].x;
- dy = dy_ = arc[3].y - arc[0].y;
+ /* Avoid possible arithmetic overflow below by splitting. */
+ if ( L > 32767 )
+ goto Split;
- L = FT_HYPOT( dx_, dy_ );
+ /* Max deviation may be as much as (s/L) * 3/4 (if Hain's v = 1). */
+ s_limit = L * (TPos)( ONE_PIXEL / 6 );
- /* Avoid possible arithmetic overflow below by splitting. */
- if ( L > 32767 )
- goto Split;
+ /* s is L * the perpendicular distance from P1 to the line P0-P3. */
+ dx1 = arc[1].x - arc[0].x;
+ dy1 = arc[1].y - arc[0].y;
+ s = FT_ABS( dy * dx1 - dx * dy1 );
- /* Max deviation may be as much as (s/L) * 3/4 (if Hain's v = 1). */
- s_limit = L * (TPos)( ONE_PIXEL / 6 );
+ if ( s > s_limit )
+ goto Split;
- /* s is L * the perpendicular distance from P1 to the line P0-P3. */
- dx1 = arc[1].x - arc[0].x;
- dy1 = arc[1].y - arc[0].y;
- s = FT_ABS( dy * dx1 - dx * dy1 );
+ /* s is L * the perpendicular distance from P2 to the line P0-P3. */
+ dx2 = arc[2].x - arc[0].x;
+ dy2 = arc[2].y - arc[0].y;
+ s = FT_ABS( dy * dx2 - dx * dy2 );
- if ( s > s_limit )
- goto Split;
+ if ( s > s_limit )
+ goto Split;
- /* s is L * the perpendicular distance from P2 to the line P0-P3. */
- dx2 = arc[2].x - arc[0].x;
- dy2 = arc[2].y - arc[0].y;
- s = FT_ABS( dy * dx2 - dx * dy2 );
+ /* Split super curvy segments where the off points are so far
+ from the chord that the angles P0-P1-P3 or P0-P2-P3 become
+ acute as detected by appropriate dot products. */
+ if ( dx1 * ( dx1 - dx ) + dy1 * ( dy1 - dy ) > 0 ||
+ dx2 * ( dx2 - dx ) + dy2 * ( dy2 - dy ) > 0 )
+ goto Split;
- if ( s > s_limit )
- goto Split;
+ gray_render_line( RAS_VAR_ arc[0].x, arc[0].y );
- /* Split super curvy segments where the off points are so far
- from the chord that the angles P0-P1-P3 or P0-P2-P3 become
- acute as detected by appropriate dot products. */
- if ( dx1 * ( dx1 - dx ) + dy1 * ( dy1 - dy ) > 0 ||
- dx2 * ( dx2 - dx ) + dy2 * ( dy2 - dy ) > 0 )
- goto Split;
+ if ( arc == bez_stack )
+ return;
- /* No reason to split. */
- goto Draw;
- }
+ arc -= 3;
+ continue;
Split:
gray_split_cubic( arc );
arc += 3;
- continue;
-
- Draw:
- gray_render_line( RAS_VAR_ arc[0].x, arc[0].y );
-
- if ( arc == ras.bez_stack )
- return;
-
- arc -= 3;
}
}
@@ -1301,18 +1188,14 @@ typedef ptrdiff_t FT_PtrDist;
TPos x, y;
- /* record current cell, if any */
- if ( !ras.invalid )
- gray_record_cell( RAS_VAR );
-
/* start to a new position */
x = UPSCALE( to->x );
y = UPSCALE( to->y );
- gray_start_cell( RAS_VAR_ TRUNC( x ), TRUNC( y ) );
+ gray_set_cell( RAS_VAR_ TRUNC( x ), TRUNC( y ) );
- worker->x = x;
- worker->y = y;
+ ras.x = x;
+ ras.y = y;
return 0;
}
@@ -1348,63 +1231,13 @@ typedef ptrdiff_t FT_PtrDist;
static void
- gray_render_span( int y,
- int count,
- const FT_Span* spans,
- gray_PWorker worker )
- {
- unsigned char* p;
- FT_Bitmap* map = &worker->target;
-
-
- /* first of all, compute the scanline offset */
- p = (unsigned char*)map->buffer - y * map->pitch;
- if ( map->pitch >= 0 )
- p += ( map->rows - 1 ) * (unsigned int)map->pitch;
-
- for ( ; count > 0; count--, spans++ )
- {
- unsigned char coverage = spans->coverage;
-
-
- if ( coverage )
- {
- /* For small-spans it is faster to do it by ourselves than
- * calling `memset'. This is mainly due to the cost of the
- * function call.
- */
- if ( spans->len >= 8 )
- FT_MEM_SET( p + spans->x, (unsigned char)coverage, spans->len );
- else
- {
- unsigned char* q = p + spans->x;
-
-
- switch ( spans->len )
- {
- case 7: *q++ = (unsigned char)coverage;
- case 6: *q++ = (unsigned char)coverage;
- case 5: *q++ = (unsigned char)coverage;
- case 4: *q++ = (unsigned char)coverage;
- case 3: *q++ = (unsigned char)coverage;
- case 2: *q++ = (unsigned char)coverage;
- case 1: *q = (unsigned char)coverage;
- default:
- ;
- }
- }
- }
- }
- }
-
-
- static void
gray_hline( RAS_ARG_ TCoord x,
TCoord y,
- TPos area,
+ TArea area,
TCoord acount )
{
- int coverage;
+ int coverage;
+ FT_Span span;
/* compute the coverage line's coverage, depending on the */
@@ -1433,179 +1266,91 @@ typedef ptrdiff_t FT_PtrDist;
coverage = 255;
}
- 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 )
+ if ( ras.render_span ) /* for FT_RASTER_FLAG_DIRECT only */
{
- FT_Span* span;
- int count;
-
-
- /* see whether we can add this span to the current list */
- count = ras.num_gray_spans;
- span = ras.gray_spans + count - 1;
- if ( count > 0 &&
- ras.span_y == y &&
- (int)span->x + span->len == (int)x &&
- span->coverage == coverage )
- {
- span->len = (unsigned short)( span->len + acount );
- return;
- }
-
- if ( ras.span_y != y || count >= FT_MAX_GRAY_SPANS )
- {
- if ( ras.render_span && count > 0 )
- ras.render_span( ras.span_y, count, ras.gray_spans,
- ras.render_span_data );
+ span.x = (short)x;
+ span.len = (unsigned short)acount;
+ span.coverage = (unsigned char)coverage;
-#ifdef FT_DEBUG_LEVEL_TRACE
-
- if ( count > 0 )
- {
- int n;
-
-
- FT_TRACE7(( "y = %3d ", ras.span_y ));
- span = ras.gray_spans;
- for ( n = 0; n < count; n++, span++ )
- FT_TRACE7(( "[%d..%d]:%02x ",
- span->x, span->x + span->len - 1, span->coverage ));
- FT_TRACE7(( "\n" ));
- }
-
-#endif /* FT_DEBUG_LEVEL_TRACE */
-
- ras.num_gray_spans = 0;
- ras.span_y = (int)y;
-
- span = ras.gray_spans;
- }
- else
- span++;
-
- /* add a gray span to the current list */
- span->x = (short)x;
- span->len = (unsigned short)acount;
- span->coverage = (unsigned char)coverage;
-
- ras.num_gray_spans++;
+ ras.render_span( y, 1, &span, ras.render_span_data );
}
- }
-
-
-#ifdef FT_DEBUG_LEVEL_TRACE
-
- /* to be called while in the debugger -- */
- /* this function causes a compiler warning since it is unused otherwise */
- static void
- gray_dump_cells( RAS_ARG )
- {
- int yindex;
-
-
- for ( yindex = 0; yindex < ras.ycount; yindex++ )
+ else
{
- PCell cell;
-
+ unsigned char* q = ras.target.origin - ras.target.pitch * y + x;
+ unsigned char c = (unsigned char)coverage;
- printf( "%3d:", yindex );
- for ( cell = ras.ycells[yindex]; cell != NULL; cell = cell->next )
- printf( " (%3ld, c:%4ld, a:%6d)", cell->x, cell->cover, cell->area );
- printf( "\n" );
+ /* For small-spans it is faster to do it by ourselves than
+ * calling `memset'. This is mainly due to the cost of the
+ * function call.
+ */
+ switch ( acount )
+ {
+ case 7: *q++ = c;
+ case 6: *q++ = c;
+ case 5: *q++ = c;
+ case 4: *q++ = c;
+ case 3: *q++ = c;
+ case 2: *q++ = c;
+ case 1: *q = c;
+ case 0: break;
+ default:
+ FT_MEM_SET( q, c, acount );
+ }
}
}
-#endif /* FT_DEBUG_LEVEL_TRACE */
-
static void
- gray_sweep( RAS_ARG_ const FT_Bitmap* target )
+ gray_sweep( RAS_ARG )
{
- int yindex;
-
- FT_UNUSED( target );
+ int y;
if ( ras.num_cells == 0 )
return;
- ras.num_gray_spans = 0;
-
FT_TRACE7(( "gray_sweep: start\n" ));
- for ( yindex = 0; yindex < ras.ycount; yindex++ )
+ for ( y = ras.min_ey; y < ras.max_ey; y++ )
{
- PCell cell = ras.ycells[yindex];
+ PCell cell = ras.ycells[y - ras.min_ey];
TCoord cover = 0;
- TCoord x = 0;
+ TCoord x = ras.min_ex;
for ( ; cell != NULL; cell = cell->next )
{
- TPos area;
+ TArea area;
- if ( cell->x > x && cover != 0 )
- gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),
+ if ( cover != 0 && cell->x > x )
+ gray_hline( RAS_VAR_ x, y, (TArea)cover * ( ONE_PIXEL * 2 ),
cell->x - x );
cover += cell->cover;
- area = cover * ( ONE_PIXEL * 2 ) - cell->area;
+ area = (TArea)cover * ( ONE_PIXEL * 2 ) - cell->area;
- if ( area != 0 && cell->x >= 0 )
- gray_hline( RAS_VAR_ cell->x, yindex, area, 1 );
+ if ( area != 0 && cell->x >= ras.min_ex )
+ gray_hline( RAS_VAR_ cell->x, y, area, 1 );
x = cell->x + 1;
}
if ( cover != 0 )
- gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),
- ras.count_ex - x );
- }
-
- if ( ras.render_span && ras.num_gray_spans > 0 )
- ras.render_span( ras.span_y, ras.num_gray_spans,
- ras.gray_spans, ras.render_span_data );
-
-#ifdef FT_DEBUG_LEVEL_TRACE
-
- if ( ras.num_gray_spans > 0 )
- {
- FT_Span* span;
- int n;
-
-
- FT_TRACE7(( "y = %3d ", ras.span_y ));
- span = ras.gray_spans;
- for ( n = 0; n < ras.num_gray_spans; n++, span++ )
- FT_TRACE7(( "[%d..%d]:%02x ",
- span->x, span->x + span->len - 1, span->coverage ));
- FT_TRACE7(( "\n" ));
+ gray_hline( RAS_VAR_ x, y, (TArea)cover * ( ONE_PIXEL * 2 ),
+ ras.max_ex - x );
}
FT_TRACE7(( "gray_sweep: end\n" ));
-
-#endif /* FT_DEBUG_LEVEL_TRACE */
-
}
-#ifdef _STANDALONE_
+#ifdef STANDALONE_
/*************************************************************************/
/* */
- /* The following function should only compile in stand-alone mode, */
+ /* The following functions should only compile in stand-alone mode, */
/* i.e., when building this component without the rest of FreeType. */
/* */
/*************************************************************************/
@@ -1883,14 +1628,82 @@ typedef ptrdiff_t FT_PtrDist;
return FT_THROW( Invalid_Outline );
}
-#endif /* _STANDALONE_ */
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Outline_Get_CBox */
+ /* */
+ /* <Description> */
+ /* Return an outline's `control box'. The control box encloses all */
+ /* the outline's points, including Bézier control points. Though it */
+ /* coincides with the exact bounding box for most glyphs, it can be */
+ /* slightly larger in some situations (like when rotating an outline */
+ /* that contains Bézier outside arcs). */
+ /* */
+ /* Computing the control box is very fast, while getting the bounding */
+ /* box can take much more time as it needs to walk over all segments */
+ /* and arcs in the outline. To get the latter, you can use the */
+ /* `ftbbox' component, which is dedicated to this single task. */
+ /* */
+ /* <Input> */
+ /* outline :: A pointer to the source outline descriptor. */
+ /* */
+ /* <Output> */
+ /* acbox :: The outline's control box. */
+ /* */
+ /* <Note> */
+ /* See @FT_Glyph_Get_CBox for a discussion of tricky fonts. */
+ /* */
- typedef struct gray_TBand_
+ static void
+ FT_Outline_Get_CBox( const FT_Outline* outline,
+ FT_BBox *acbox )
{
- TPos min, max;
+ TPos xMin, yMin, xMax, yMax;
+
+
+ if ( outline && acbox )
+ {
+ if ( outline->n_points == 0 )
+ {
+ xMin = 0;
+ yMin = 0;
+ xMax = 0;
+ yMax = 0;
+ }
+ else
+ {
+ FT_Vector* vec = outline->points;
+ FT_Vector* limit = vec + outline->n_points;
+
+
+ xMin = xMax = vec->x;
+ yMin = yMax = vec->y;
+ vec++;
+
+ for ( ; vec < limit; vec++ )
+ {
+ TPos x, y;
- } gray_TBand;
+
+ x = vec->x;
+ if ( x < xMin ) xMin = x;
+ if ( x > xMax ) xMax = x;
+
+ y = vec->y;
+ if ( y < yMin ) yMin = y;
+ if ( y > yMax ) yMax = y;
+ }
+ }
+ acbox->xMin = xMin;
+ acbox->xMax = xMax;
+ acbox->yMin = yMin;
+ acbox->yMax = yMax;
+ }
+ }
+
+#endif /* STANDALONE_ */
FT_DEFINE_OUTLINE_FUNCS(
@@ -1920,10 +1733,18 @@ typedef ptrdiff_t FT_PtrDist;
error = FT_Outline_Decompose( &ras.outline, &func_interface, &ras );
if ( !ras.invalid )
gray_record_cell( RAS_VAR );
+
+ FT_TRACE7(( "band [%d..%d]: %d cells\n",
+ ras.min_ey, ras.max_ey, ras.num_cells ));
}
else
+ {
error = FT_THROW( Memory_Overflow );
+ FT_TRACE7(( "band [%d..%d]: to be bisected\n",
+ ras.min_ey, ras.max_ey ));
+ }
+
return error;
}
@@ -1931,100 +1752,72 @@ typedef ptrdiff_t FT_PtrDist;
static int
gray_convert_glyph( RAS_ARG )
{
- gray_TBand bands[40];
- gray_TBand* volatile band;
- int volatile n, num_bands;
- TPos volatile min, max, max_y;
- FT_BBox* clip;
-
-
- /* Set up state in the raster object */
- gray_compute_cbox( RAS_VAR );
-
- /* clip to target bitmap, exit if nothing to do */
- clip = &ras.clip_box;
+ TCell buffer[FT_MAX_GRAY_POOL];
+ TCoord band_size = FT_MAX_GRAY_POOL / 8;
+ TCoord count = ras.max_ey - ras.min_ey;
+ int num_bands;
+ TCoord min, max, max_y;
+ TCoord bands[32]; /* enough to accommodate bisections */
+ TCoord* band;
- 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 )
- num_bands = 1;
- if ( num_bands >= 39 )
- num_bands = 39;
-
- ras.band_shoot = 0;
+ if ( count > band_size )
+ {
+ /* two divisions rounded up */
+ num_bands = (int)( ( count + band_size - 1) / band_size );
+ band_size = ( count + num_bands - 1 ) / num_bands;
+ }
min = ras.min_ey;
max_y = ras.max_ey;
- for ( n = 0; n < num_bands; n++, min = max )
+ for ( ; min < max_y; min = max )
{
- max = min + ras.band_size;
- if ( n == num_bands - 1 || max > max_y )
+ max = min + band_size;
+ if ( max > max_y )
max = max_y;
- bands[0].min = min;
- bands[0].max = max;
- band = bands;
+ band = bands;
+ band[1] = min;
+ band[0] = max;
do
{
- TPos bottom, top, middle;
- int error;
+ TCoord width = band[0] - band[1];
+ int error;
- {
- PCell cells_max;
- int yindex;
- long cell_start, cell_end, cell_mod;
+ /* memory management */
+ {
+ size_t ycount = (size_t)width;
+ size_t cell_start;
- ras.ycells = (PCell*)ras.buffer;
- ras.ycount = band->max - band->min;
-
- cell_start = (long)sizeof ( PCell ) * ras.ycount;
- cell_mod = cell_start % (long)sizeof ( TCell );
- if ( cell_mod > 0 )
- cell_start += (long)sizeof ( TCell ) - cell_mod;
- cell_end = ras.buffer_size;
- cell_end -= cell_end % (long)sizeof ( TCell );
+ cell_start = ( ycount * sizeof ( PCell ) + sizeof ( TCell ) - 1 ) /
+ sizeof ( TCell );
- cells_max = (PCell)( (char*)ras.buffer + cell_end );
- ras.cells = (PCell)( (char*)ras.buffer + cell_start );
- if ( ras.cells >= cells_max )
+ if ( FT_MAX_GRAY_POOL - cell_start < 2 )
goto ReduceBands;
- ras.max_cells = cells_max - ras.cells;
- if ( ras.max_cells < 2 )
- goto ReduceBands;
+ ras.cells = buffer + cell_start;
+ ras.max_cells = (FT_PtrDist)( FT_MAX_GRAY_POOL - cell_start );
- for ( yindex = 0; yindex < ras.ycount; yindex++ )
- ras.ycells[yindex] = NULL;
+ ras.ycells = (PCell*)buffer;
+ while ( ycount )
+ ras.ycells[--ycount] = NULL;
}
ras.num_cells = 0;
ras.invalid = 1;
- ras.min_ey = band->min;
- ras.max_ey = band->max;
- ras.count_ey = band->max - band->min;
+ ras.min_ey = band[1];
+ ras.max_ey = band[0];
error = gray_convert_glyph_inner( RAS_VAR );
if ( !error )
{
- gray_sweep( RAS_VAR_ &ras.target );
+ gray_sweep( RAS_VAR );
band--;
continue;
}
@@ -2033,56 +1826,46 @@ typedef ptrdiff_t FT_PtrDist;
ReduceBands:
/* render pool overflow; we will reduce the render band by half */
- bottom = band->min;
- top = band->max;
- middle = bottom + ( ( top - bottom ) >> 1 );
+ width >>= 1;
/* This is too complex for a single scanline; there must */
/* be some problems. */
- if ( middle == bottom )
+ if ( width == 0 )
{
-#ifdef FT_DEBUG_LEVEL_TRACE
FT_TRACE7(( "gray_convert_glyph: rotten glyph\n" ));
-#endif
return 1;
}
- if ( bottom-top >= ras.band_size )
- ras.band_shoot++;
-
- band[1].min = bottom;
- band[1].max = middle;
- band[0].min = middle;
- band[0].max = top;
band++;
+ band[1] = band[0];
+ band[0] += width;
} while ( band >= bands );
}
- if ( ras.band_shoot > 8 && ras.band_size > 16 )
- ras.band_size = ras.band_size / 2;
-
return 0;
}
static int
- gray_raster_render( gray_PRaster raster,
+ gray_raster_render( FT_Raster raster,
const FT_Raster_Params* params )
{
const FT_Outline* outline = (const FT_Outline*)params->source;
const FT_Bitmap* target_map = params->target;
+ FT_BBox cbox, clip;
+#ifndef FT_STATIC_RASTER
gray_TWorker worker[1];
-
- TCell buffer[FT_MAX( FT_RENDER_POOL_SIZE, 2048 ) / sizeof ( TCell )];
- long buffer_size = sizeof ( buffer );
- int band_size = (int)( buffer_size /
- (long)( sizeof ( TCell ) * 8 ) );
+#endif
if ( !raster )
return FT_THROW( Invalid_Argument );
+ /* this version does not support monochrome rendering */
+ if ( !( params->flags & FT_RASTER_FLAG_AA ) )
+ return FT_THROW( Invalid_Mode );
+
if ( !outline )
return FT_THROW( Invalid_Outline );
@@ -2097,9 +1880,19 @@ typedef ptrdiff_t FT_PtrDist;
outline->contours[outline->n_contours - 1] + 1 )
return FT_THROW( Invalid_Outline );
- /* if direct mode is not set, we must have a target bitmap */
- if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
+ ras.outline = *outline;
+
+ if ( params->flags & FT_RASTER_FLAG_DIRECT )
{
+ if ( !params->gray_spans )
+ return 0;
+
+ ras.render_span = (FT_Raster_Span_Func)params->gray_spans;
+ ras.render_span_data = params->user;
+ }
+ else
+ {
+ /* if direct mode is not set, we must have a target bitmap */
if ( !target_map )
return FT_THROW( Invalid_Argument );
@@ -2109,51 +1902,59 @@ typedef ptrdiff_t FT_PtrDist;
if ( !target_map->buffer )
return FT_THROW( Invalid_Argument );
+
+ if ( target_map->pitch < 0 )
+ ras.target.origin = target_map->buffer;
+ else
+ ras.target.origin = target_map->buffer
+ + ( target_map->rows - 1 ) * (unsigned int)target_map->pitch;
+
+ ras.target.pitch = target_map->pitch;
+
+ ras.render_span = (FT_Raster_Span_Func)NULL;
+ ras.render_span_data = NULL;
}
- /* this version does not support monochrome rendering */
- if ( !( params->flags & FT_RASTER_FLAG_AA ) )
- return FT_THROW( Invalid_Mode );
+ FT_Outline_Get_CBox( outline, &cbox );
+
+ /* reject too large outline coordinates */
+ if ( cbox.xMin < -0x1000000L || cbox.xMax > 0x1000000L ||
+ cbox.yMin < -0x1000000L || cbox.yMax > 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;
}
- gray_init_cells( RAS_VAR_ buffer, buffer_size );
-
- ras.outline = *outline;
- ras.num_cells = 0;
- ras.invalid = 1;
- ras.band_size = band_size;
- ras.num_gray_spans = 0;
- ras.span_y = 0;
+ /* 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 ( params->flags & FT_RASTER_FLAG_DIRECT )
- {
- ras.render_span = (FT_Raster_Span_Func)params->gray_spans;
- ras.render_span_data = params->user;
- }
- else
- {
- ras.target = *target_map;
- ras.render_span = (FT_Raster_Span_Func)gray_render_span;
- ras.render_span_data = &ras;
- }
+ if ( ras.max_ex <= ras.min_ex || ras.max_ey <= ras.min_ey )
+ return 0;
return gray_convert_glyph( RAS_VAR );
}
@@ -2162,7 +1963,7 @@ typedef ptrdiff_t FT_PtrDist;
/**** RASTER OBJECT CREATION: In stand-alone mode, we simply use *****/
/**** a static object. *****/
-#ifdef _STANDALONE_
+#ifdef STANDALONE_
static int
gray_raster_new( void* memory,
@@ -2187,7 +1988,7 @@ typedef ptrdiff_t FT_PtrDist;
FT_UNUSED( raster );
}
-#else /* !_STANDALONE_ */
+#else /* !STANDALONE_ */
static int
gray_raster_new( FT_Memory memory,
@@ -2217,13 +2018,13 @@ typedef ptrdiff_t FT_PtrDist;
FT_FREE( raster );
}
-#endif /* !_STANDALONE_ */
+#endif /* !STANDALONE_ */
static void
- gray_raster_reset( FT_Raster raster,
- char* pool_base,
- long pool_size )
+ gray_raster_reset( FT_Raster raster,
+ unsigned char* pool_base,
+ unsigned long pool_size )
{
FT_UNUSED( raster );
FT_UNUSED( pool_base );
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 15:48:23 +0000