diff options
Diffstat (limited to 'src/smooth/ftgrays.c')
| -rw-r--r-- | src/smooth/ftgrays.c | 175 |
1 files changed, 98 insertions, 77 deletions
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c index a12a9ecfb..9de014176 100644 --- a/src/smooth/ftgrays.c +++ b/src/smooth/ftgrays.c @@ -82,7 +82,7 @@ #include <string.h> /* for memcpy() */ - +#include <setjmp.h> /*************************************************************************/ /* */ @@ -94,6 +94,8 @@ #define FT_COMPONENT trace_aaraster +#define ErrRaster_MemoryOverflow -4 + #ifdef _STANDALONE_ @@ -264,12 +266,13 @@ void* render_span_data; int span_y; - int band_size; - int band_shoot; - int conic_level; - int cubic_level; + int band_size; + int band_shoot; + int conic_level; + int cubic_level; - void* memory; + void* memory; + jmp_buf jump_buffer; } TRaster, *PRaster; @@ -296,10 +299,11 @@ /* Compute the outline bounding box. */ /* */ static - void compute_cbox( RAS_ARG_ FT_Outline* outline ) + void compute_cbox( RAS_ARG ) { - FT_Vector* vec = outline->points; - FT_Vector* limit = vec + outline->n_points; + FT_Outline* outline = &ras.outline; + FT_Vector* vec = outline->points; + FT_Vector* limit = vec + outline->n_points; if ( outline->n_points <= 0 ) @@ -339,7 +343,7 @@ /* Record the current cell in the table. */ /* */ static - int record_cell( RAS_ARG ) + void record_cell( RAS_ARG ) { PCell cell; @@ -347,7 +351,7 @@ if ( !ras.invalid && ( ras.area | ras.cover ) ) { if ( ras.num_cells >= ras.max_cells ) - return 1; + longjmp( ras.jump_buffer, 1 ); cell = ras.cells + ras.num_cells++; cell->x = ras.ex - ras.min_ex; @@ -355,8 +359,6 @@ cell->area = ras.area; cell->cover = ras.cover; } - - return 0; } @@ -365,8 +367,8 @@ /* Set the current cell to a new position. */ /* */ static - int set_cell( RAS_ARG_ TScan ex, - TScan ey ) + void set_cell( RAS_ARG_ TScan ex, + TScan ey ) { int invalid, record, clean; @@ -402,8 +404,8 @@ /* record the previous cell if needed (i.e., if we changed the cell */ /* position, of changed the `invalid' flag) */ - if ( ( ras.invalid != invalid || record ) && record_cell( RAS_VAR ) ) - return 1; + if ( ras.invalid != invalid || record ) + record_cell( RAS_VAR ); if ( clean ) { @@ -414,7 +416,6 @@ ras.invalid = invalid; ras.ex = ex; ras.ey = ey; - return 0; } @@ -436,7 +437,7 @@ ras.last_ey = SUBPIXELS( ey ); ras.invalid = 0; - (void)set_cell( RAS_VAR_ ex, ey ); + set_cell( RAS_VAR_ ex, ey ); } @@ -445,11 +446,11 @@ /* Render a scanline as one or more cells. */ /* */ static - int render_scanline( RAS_ARG_ TScan ey, - TPos x1, - TScan y1, - TPos x2, - TScan y2 ) + void render_scanline( RAS_ARG_ TScan ey, + TPos x1, + TScan y1, + TPos x2, + TScan y2 ) { TScan ex1, ex2, fx1, fx2, delta; long p, first, dx; @@ -465,7 +466,10 @@ /* trivial case. Happens often */ if ( y1 == y2 ) - return set_cell( RAS_VAR_ ex2, ey ); + { + set_cell( RAS_VAR_ ex2, ey ); + return; + } /* everything is located in a single cell. That is easy! */ /* */ @@ -474,7 +478,7 @@ delta = y2 - y1; ras.area += ( fx1 + fx2 ) * delta; ras.cover += delta; - return 0; + return; } /* ok, we'll have to render a run of adjacent cells on the same */ @@ -504,8 +508,7 @@ ras.cover += delta; ex1 += incr; - if ( set_cell( RAS_VAR_ ex1, ey ) ) - goto Error; + set_cell( RAS_VAR_ ex1, ey ); y1 += delta; if ( ex1 != ex2 ) @@ -535,19 +538,13 @@ ras.cover += delta; y1 += delta; ex1 += incr; - if ( set_cell( RAS_VAR_ ex1, ey ) ) - goto Error; + set_cell( RAS_VAR_ ex1, ey ); } } delta = y2 - y1; ras.area += ( fx2 + ONE_PIXEL - first ) * delta; ras.cover += delta; - - return 0; - - Error: - return 1; } @@ -556,7 +553,7 @@ /* Render a given line as a series of scanlines. */ /* */ static - int render_line( RAS_ARG_ TPos to_x, + void render_line( RAS_ARG_ TPos to_x, TPos to_y ) { TScan ey1, ey2, fy1, fy2; @@ -594,8 +591,7 @@ /* everything is on a single scanline */ if ( ey1 == ey2 ) { - if ( render_scanline( RAS_VAR_ ey1, ras.x, fy1, to_x, fy2 ) ) - goto Error; + render_scanline( RAS_VAR_ ey1, ras.x, fy1, to_x, fy2 ); goto End; } @@ -621,12 +617,10 @@ } x = ras.x + delta; - if ( render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, first ) ) - goto Error; + render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, first ); ey1 += incr; - if ( set_cell( RAS_VAR_ TRUNC( x ), ey1 ) ) - goto Error; + set_cell( RAS_VAR_ TRUNC( x ), ey1 ); if ( ey1 != ey2 ) { @@ -651,29 +645,20 @@ } x2 = x + delta; - if ( render_scanline( RAS_VAR_ ey1, - x, ONE_PIXEL - first, x2, first ) ) - goto Error; + render_scanline( RAS_VAR_ ey1, x, ONE_PIXEL - first, x2, first ); x = x2; + ey1 += incr; - if ( set_cell( RAS_VAR_ TRUNC( x ), ey1 ) ) - goto Error; + set_cell( RAS_VAR_ TRUNC( x ), ey1 ); } } - if ( render_scanline( RAS_VAR_ ey1, - x, ONE_PIXEL - first, to_x, fy2 ) ) - goto Error; + render_scanline( RAS_VAR_ ey1, x, ONE_PIXEL - first, to_x, fy2 ); End: ras.x = to_x; ras.y = to_y; ras.last_ey = SUBPIXELS( ey2 ); - - return 0; - - Error: - return 1; } @@ -698,7 +683,7 @@ static - int render_conic( RAS_ARG_ FT_Vector* control, + void render_conic( RAS_ARG_ FT_Vector* control, FT_Vector* to ) { TPos dx, dy; @@ -737,8 +722,9 @@ mid_x = ( ras.x + to_x + 2 * UPSCALE( control->x ) ) / 4; mid_y = ( ras.y + to_y + 2 * UPSCALE( control->y ) ) / 4; - return render_line( RAS_VAR_ mid_x, mid_y ) || - render_line( RAS_VAR_ to_x, to_y ); + render_line( RAS_VAR_ mid_x, mid_y ); + render_line( RAS_VAR_ to_x, to_y ); + return; } arc = ras.bez_stack; @@ -792,15 +778,14 @@ mid_x = ( ras.x + to_x + 2 * arc[1].x ) / 4; mid_y = ( ras.y + to_y + 2 * arc[1].y ) / 4; - if ( render_line( RAS_VAR_ mid_x, mid_y ) || - render_line( RAS_VAR_ to_x, to_y ) ) - return 1; + render_line( RAS_VAR_ mid_x, mid_y ); + render_line( RAS_VAR_ to_x, to_y ); top--; arc -= 2; } } - return 0; + return; } @@ -833,7 +818,7 @@ static - int render_cubic( RAS_ARG_ FT_Vector* control1, + void render_cubic( RAS_ARG_ FT_Vector* control1, FT_Vector* control2, FT_Vector* to ) { @@ -885,8 +870,9 @@ mid_y = ( ras.y + to_y + 3 * UPSCALE( control1->y + control2->y ) ) / 8; - return render_line( RAS_VAR_ mid_x, mid_y ) || - render_line( RAS_VAR_ to_x, to_y ); + render_line( RAS_VAR_ mid_x, mid_y ); + render_line( RAS_VAR_ to_x, to_y ); + return; } arc = ras.bez_stack; @@ -941,14 +927,13 @@ mid_x = ( ras.x + to_x + 3 * ( arc[1].x + arc[2].x ) ) / 8; mid_y = ( ras.y + to_y + 3 * ( arc[1].y + arc[2].y ) ) / 8; - if ( render_line( RAS_VAR_ mid_x, mid_y ) || - render_line( RAS_VAR_ to_x, to_y ) ) - return 1; + render_line( RAS_VAR_ mid_x, mid_y ); + render_line( RAS_VAR_ to_x, to_y ); top --; arc -= 3; } } - return 0; + return; } @@ -1157,7 +1142,9 @@ /* start to a new position */ x = UPSCALE( to->x ); y = UPSCALE( to->y ); + start_cell( (PRaster)raster, TRUNC( x ), TRUNC( y ) ); + ((PRaster)raster)->x = x; ((PRaster)raster)->y = y; return 0; @@ -1168,8 +1155,9 @@ int Line_To( FT_Vector* to, FT_Raster raster ) { - return render_line( (PRaster)raster, - UPSCALE( to->x ), UPSCALE( to->y ) ); + render_line( (PRaster)raster, + UPSCALE( to->x ), UPSCALE( to->y ) ); + return 0; } @@ -1178,7 +1166,8 @@ FT_Vector* to, FT_Raster raster ) { - return render_conic( (PRaster)raster, control, to ); + render_conic( (PRaster)raster, control, to ); + return 0; } @@ -1188,7 +1177,8 @@ FT_Vector* to, FT_Raster raster ) { - return render_cubic( (PRaster)raster, control1, control2, to ); + render_cubic( (PRaster)raster, control1, control2, to ); + return 0; } @@ -1487,7 +1477,11 @@ void* user ) { #undef SCALED -#define SCALED( x ) ( ( (x) << shift ) - delta ) +#if 0 +# define SCALED( x ) ( ( (x) << shift ) - delta ) +#else +# define SCALED( x) (x) +#endif FT_Vector v_last; FT_Vector v_control; @@ -1502,8 +1496,10 @@ int error; char tag; /* current point's state */ +#if 0 int shift = interface->shift; FT_Pos delta = interface->delta; +#endif first = 0; @@ -1691,8 +1687,8 @@ } TBand; - static - int grays_convert_glyph( RAS_ARG_ FT_Outline* outline ) + static int + grays_convert_glyph_inner( RAS_ARG ) { static const FT_Outline_Funcs interface = @@ -1705,6 +1701,25 @@ 0 }; + volatile int error = 0; + + if ( setjmp( ras.jump_buffer ) == 0 ) + { + error = FT_Outline_Decompose( &ras.outline, &interface, &ras ); + record_cell( RAS_VAR ); + } + else + { + error = ErrRaster_MemoryOverflow; + } + + return error; + } + + + static + int grays_convert_glyph( RAS_ARG_ FT_Outline* outline ) + { TBand bands[40], *band; int n, num_bands; TPos min, max, max_y; @@ -1712,7 +1727,7 @@ /* Set up state in the raster object */ - compute_cbox( RAS_VAR_ outline ); + compute_cbox( RAS_VAR ); /* clip to target bitmap, exit if nothing to do */ clip = &ras.clip_box; @@ -1776,8 +1791,12 @@ ras.min_ey = band->min; ras.max_ey = band->max; +#if 1 + error = grays_convert_glyph_inner( RAS_VAR ); +#else error = FT_Outline_Decompose( outline, &interface, &ras ) || record_cell( RAS_VAR ); +#endif if ( !error ) { @@ -1796,6 +1815,8 @@ band--; continue; } + else if ( error != ErrRaster_MemoryOverflow ) + return 1; /* render pool overflow, we will reduce the render band by half */ bottom = band->min; |