diff options
Diffstat (limited to 'libXfont/src/Speedo/out_bl2d.c')
| -rw-r--r-- | libXfont/src/Speedo/out_bl2d.c | 772 |
1 files changed, 772 insertions, 0 deletions
diff --git a/libXfont/src/Speedo/out_bl2d.c b/libXfont/src/Speedo/out_bl2d.c new file mode 100644 index 000000000..6c38cb30d --- /dev/null +++ b/libXfont/src/Speedo/out_bl2d.c @@ -0,0 +1,772 @@ +/* $Xorg: out_bl2d.c,v 1.3 2000/08/17 19:46:26 cpqbld Exp $ */ + +/* + +Copyright 1989-1991, Bitstream Inc., Cambridge, MA. +You are hereby granted permission under all Bitstream propriety rights to +use, copy, modify, sublicense, sell, and redistribute the Bitstream Speedo +software and the Bitstream Charter outline font for any purpose and without +restrictions; provided, that this notice is left intact on all copies of such +software or font and that Bitstream's trademark is acknowledged as shown below +on all unmodified copies of such font. + +BITSTREAM CHARTER is a registered trademark of Bitstream Inc. + + +BITSTREAM INC. DISCLAIMS ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING +WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +PARTICULAR PURPOSE. BITSTREAM SHALL NOT BE LIABLE FOR ANY DIRECT OR INDIRECT +DAMAGES, INCLUDING BUT NOT LIMITED TO LOST PROFITS, LOST DATA, OR ANY OTHER +INCIDENTAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF OR IN ANY WAY CONNECTED +WITH THE SPEEDO SOFTWARE OR THE BITSTREAM CHARTER OUTLINE FONT. + +*/ +/* $XFree86: xc/lib/font/Speedo/out_bl2d.c,v 1.3 1999/02/07 11:47:14 dawes Exp $ */ + +/*************************** O U T _ B L 2 D . C ***************************** + * * + * This is an output module for screen writer using two dimensional scanning * + ****************************************************************************/ + + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include "spdo_prv.h" /* General definitions for speedo */ + +#define CLOCKWISE 1 +#define DEBUG 0 +#define ABS(X) ( (X < 0) ? -X : X) + +#if DEBUG +#include <stdio.h> +#define SHOW(X) printf("X = %d\n", X) +#else +#define SHOW(X) +#endif + +/***** GLOBAL VARIABLES *****/ + +/***** GLOBAL FUNCTIONS *****/ + +/***** EXTERNAL VARIABLES *****/ + +/***** EXTERNAL FUNCTIONS *****/ + +/***** STATIC VARIABLES *****/ + +/***** STATIC FUNCTIONS *****/ + +#if INCL_2D +static void sp_draw_vector_to_2d(PROTO_DECL2 fix15 x0,fix15 y0,fix15 x1,fix15 y1,band_t GLOBALFAR *band); +static void sp_add_intercept_2d(PROTO_DECL2 fix15 y,fix15 x); +static void sp_proc_intercepts_2d(PROTO_DECL1); +#endif + +#if INCL_2D +FUNCTION boolean init_2d( +GDECL +specs_t GLOBALFAR *specsarg) +/* + * init_out_2d() is called by sp_set_specs() to initialize the output module. + * Returns TRUE if output module can accept requested specifications. + * Returns FALSE otherwise. + */ +{ + +if (specsarg->flags & CURVES_OUT) + return FALSE; /* Curves out, clipping not supported */ + +#if DEBUG +printf("INIT_OUT__2d()\n"); +#endif +return TRUE; +} +#endif + +#if INCL_2D +FUNCTION boolean begin_char_2d( +GDECL +point_t Psw, +point_t Pmin, +point_t Pmax) +/* Called once at the start of the character generation process + * Initializes intercept table, either calculates pixel maxima or + * decides that they need to be collected + */ +{ +#if DEBUG +printf("BEGIN_CHAR__2d(%3.1f, %3.1f, %3.1f, %3.1f, %3.1f, %3.1f\n", + (real)Psw.x / (real)sp_globals.onepix, (real)Psw.y / (real)sp_globals.onepix, + (real)Pmin.x / (real)sp_globals.onepix, (real)Pmin.y / (real)sp_globals.onepix, + (real)Pmax.x / (real)sp_globals.onepix, (real)Pmax.y / (real)sp_globals.onepix); +#endif +/* Convert PIX.FRAC to 16.16 form */ +sp_globals.x_scan_active = TRUE; /* Assume x-scanning from the start */ + +init_char_out(Psw,Pmin,Pmax); +return TRUE; +} +#endif + + +#if INCL_2D +FUNCTION void begin_contour_2d( +GDECL +point_t P1, +boolean outside) +/* Called at the start of each contour + */ +{ + +#if DEBUG +printf("BEGIN_CONTOUR__2d(%3.4f, %3.4f, %s)\n", + (real)P1.x / (real)sp_globals.onepix, + (real)P1.y / (real)sp_globals.onepix, + outside? "outside": "inside"); +#endif +sp_globals.x0_spxl = P1.x; +sp_globals.y0_spxl = P1.y; +} +#endif + +#if INCL_2D +FUNCTION void line_2d( +GDECL +point_t P1) +/* + * Called for each vector in the transformed character + * "draws" vector into intercept table + */ +{ + +#if DEBUG +printf("LINE_0(%3.4f, %3.4f)\n", + (real)P1.x / (real)sp_globals.onepix, + (real)P1.y / (real)sp_globals.onepix); +#endif + +if (sp_globals.extents_running) + { + if (sp_globals.x0_spxl > sp_globals.bmap_xmax) + sp_globals.bmap_xmax = sp_globals.x0_spxl; + if (sp_globals.x0_spxl < sp_globals.bmap_xmin) + sp_globals.bmap_xmin = sp_globals.x0_spxl; + if (sp_globals.y0_spxl > sp_globals.bmap_ymax) + sp_globals.bmap_ymax = sp_globals.y0_spxl; + if (sp_globals.y0_spxl < sp_globals.bmap_ymin) + sp_globals.bmap_ymin = sp_globals.y0_spxl; + } + +if (!sp_globals.intercept_oflo) + { + sp_draw_vector_to_2d(sp_globals.x0_spxl, + sp_globals.y0_spxl, + P1.x, + P1.y, + &sp_globals.y_band); /* y-scan */ + + if (sp_globals.x_scan_active) + sp_draw_vector_to_2d(sp_globals.y0_spxl, + sp_globals.x0_spxl, + P1.y, + P1.x, + &sp_globals.x_band); /* x-scan if selected */ + } + +sp_globals.x0_spxl = P1.x; +sp_globals.y0_spxl = P1.y; /* update endpoint */ +} + +FUNCTION static void sp_draw_vector_to_2d( +GDECL +fix15 x0, /* X coordinate */ +fix15 y0, /* Y coordinate */ +fix15 x1, +fix15 y1, +band_t GLOBALFAR *band) +{ +register fix15 how_many_y; /* # of intercepts at y = n + 1/2 */ +register fix15 yc; /* Current scan-line */ + fix15 temp1; /* various uses */ + fix15 temp2; /* various uses */ +register fix31 dx_dy; /* slope of line in 16.16 form */ +register fix31 xc; /* high-precision (16.16) x coordinate */ + fix15 y_pxl; + +yc = (y0 + sp_globals.pixrnd) >> sp_globals.pixshift; /* current scan line = end of last line */ +y_pxl = (y1 + sp_globals.pixrnd) >> sp_globals.pixshift; /* calculate new end-scan line */ + +if ((how_many_y = y_pxl - yc) == 0) return; /* Don't draw a null line */ + +if (how_many_y < 0) yc--; /* Predecrment downward lines */ + +if (yc > band->band_max) /* Is start point above band? */ + { + if (y_pxl > band->band_max) return; /* line has to go down! */ + how_many_y = y_pxl - (yc = band->band_max) - 1; /* Yes, limit it */ + } + +if (yc < band->band_min) /* Is start point below band? */ + { + if (y_pxl < band->band_min) return; /* line has to go up! */ + how_many_y = y_pxl - (yc = band->band_min); /* Yes, limit it */ + } + +xc = (fix31)(x0 + sp_globals.pixrnd) << 16; /* Original x coordinate with built in */ + /* rounding. int.16 + pixshift form */ + +if ( (temp1 = (x1 - x0)) == 0) /* check for vertical line */ + { + dx_dy = 0L; /* Zero slope, leave xc alone */ + goto skip_calc; + } + +/* calculate dx_dy at 16.16 fixed point */ + +dx_dy = ( (fix31)temp1 << 16 )/(fix31)(y1 - y0); + +/* We have to check for a @#$%@# possible multiply overflow */ +/* by doing another @#$*& multiply. In assembly language, */ +/* the program could just check the OVerflow flag or whatever*/ +/* works on the particular processor. This C code is meant */ +/* to be processor independent. */ + +temp1 = (yc << sp_globals.pixshift) - y0 + sp_globals.pixrnd; +/* This sees if the sign bits start at bit 15 */ +/* if they do, no overflow has occurred */ + +temp2 = (fix15)(MULT16(temp1,(fix15)(dx_dy >> 16)) >> 15); + +if ( (temp2 != (fix15)0xFFFF) && + (temp2 != 0x0000) ) + { /* Overflow. Pick point closest to yc + .5 */ + if (ABS(temp1) < ABS((yc << sp_globals.pixshift) - y1 + sp_globals.pixrnd)) + { /* use x1 instead of x0 */ + xc = (fix31)(x1 + sp_globals.pixrnd) << (16 - sp_globals.pixshift); + } + goto skip_calc; + } +/* calculate new xc at the center of the *current* scan line */ +/* due to banding, yc may be several lines away from y0 */ +/* xc += (yc + .5 - y0) * dx_dy */ +/* This multiply generates a subpixel delta. */ +/* So we leave it as an int.pixshift + 16 delta */ + +xc += (fix31)temp1 * dx_dy; +dx_dy <<= sp_globals.pixshift; +skip_calc: + +yc -= band->band_array_offset; /* yc is now an offset relative to the band */ + +if (how_many_y < 0) + { /* Vector down */ + if ((how_many_y += yc + 1) < band->band_floor) + how_many_y = band->band_floor; /* can't go below floor */ + while(yc >= how_many_y) + { + temp1 = (fix15)(xc >> 16); + sp_add_intercept_2d(yc--,temp1); + xc -= dx_dy; + } + } + else + { /* Vector up */ + /* check to see that line doesn't extend beyond top of band */ + if ((how_many_y += yc) > band->band_ceiling) + how_many_y = band->band_ceiling; + while(yc < how_many_y) + { + temp1 = (fix15)(xc >> 16); + sp_add_intercept_2d(yc++,temp1); + xc += dx_dy; + } + } +} + +#endif + +#if INCL_2D +FUNCTION boolean end_char_2d() +/* Called when all character data has been output + * Return TRUE if output process is complete + * Return FALSE to repeat output of the transformed data beginning + * with the first contour + */ +{ + +fix31 xorg; +fix31 yorg; +#if INCL_CLIPPING +fix31 em_max, em_min, bmap_max, bmap_min; +#endif + +#if DEBUG +printf("END_CHAR__2d()\n"); +#endif + +if (sp_globals.first_pass) + { + if (sp_globals.bmap_xmax >= sp_globals.bmap_xmin) + { + sp_globals.xmin = (sp_globals.bmap_xmin + sp_globals.pixrnd + 1) >> sp_globals.pixshift; + sp_globals.xmax = (sp_globals.bmap_xmax + sp_globals.pixrnd) >> sp_globals.pixshift; + } + else + { + sp_globals.xmin = sp_globals.xmax = 0; + } + if (sp_globals.bmap_ymax >= sp_globals.bmap_ymin) + { + +#if INCL_CLIPPING + switch(sp_globals.tcb0.xtype) + { + case 1: /* 180 degree rotation */ + if (sp_globals.specs.flags & CLIP_TOP) + { + sp_globals.clip_ymin = (fix31)((fix31)EM_TOP * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_ymin = sp_globals.clip_ymin >> sp_globals.multshift; + bmap_min = (sp_globals.bmap_ymin + sp_globals.pixrnd + 1) >> sp_globals.pixshift; + sp_globals.clip_ymin = -1 * sp_globals.clip_ymin; + if (bmap_min < sp_globals.clip_ymin) + sp_globals.ymin = sp_globals.clip_ymin; + else + sp_globals.ymin = bmap_min; + } + if (sp_globals.specs.flags & CLIP_BOTTOM) + { + sp_globals.clip_ymax = (fix31)((fix31)(-1 * EM_BOT) * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_ymax = sp_globals.clip_ymax >> sp_globals.multshift; + bmap_max = (sp_globals.bmap_ymax + sp_globals.pixrnd) >> sp_globals.pixshift; + if (bmap_max < sp_globals.clip_ymax) + sp_globals.ymax = bmap_max; + else + sp_globals.ymax = sp_globals.clip_ymax; + } + sp_globals.clip_xmax = -sp_globals.xmin; + sp_globals.clip_xmin = ((sp_globals.set_width.x+32768L) >> 16) - + sp_globals.xmin; + break; + case 2: /* 90 degree rotation */ + if (sp_globals.specs.flags & CLIP_TOP) + { + sp_globals.clip_xmin = (fix31)((fix31)(-1 * EM_BOT) * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_xmin = sp_globals.clip_xmin >> sp_globals.multshift; + sp_globals.clip_xmin = -1 * sp_globals.clip_xmin; + bmap_min = (sp_globals.bmap_xmin + sp_globals.pixrnd + 1) >> sp_globals.pixshift; + if (bmap_min > sp_globals.clip_xmin) + sp_globals.clip_xmin = bmap_min; + + /* normalize to x origin */ + sp_globals.clip_xmin -= sp_globals.xmin; + } + if (sp_globals.specs.flags & CLIP_BOTTOM) + { + sp_globals.clip_xmax = (fix31)((fix31)EM_TOP * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_xmax = sp_globals.clip_xmax >> sp_globals.multshift; + bmap_max = (sp_globals.bmap_xmax + sp_globals.pixrnd) >> sp_globals.pixshift; + if (bmap_max < sp_globals.clip_xmax) + sp_globals.xmax = bmap_max; + else + sp_globals.xmax = sp_globals.clip_xmax; + sp_globals.clip_ymax = 0; + if ((sp_globals.specs.flags & CLIP_TOP) && + (sp_globals.ymax > sp_globals.clip_ymax)) + sp_globals.ymax = sp_globals.clip_ymax; + sp_globals.clip_ymin = ((sp_globals.set_width.y+32768L) >> 16); + if ((sp_globals.specs.flags & CLIP_BOTTOM) && + (sp_globals.ymin < sp_globals.clip_ymin)) + sp_globals.ymin = sp_globals.clip_ymin; + /* normalize to x origin */ + sp_globals.clip_xmax -= sp_globals.xmin; + } + break; + case 3: /* 270 degree rotation */ + if (sp_globals.specs.flags & CLIP_TOP) + { + sp_globals.clip_xmin = (fix31)((fix31)EM_TOP * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_xmin = sp_globals.clip_xmin >> sp_globals.multshift; + sp_globals.clip_xmin = -1 * sp_globals.clip_xmin; + bmap_min = (sp_globals.bmap_xmin + sp_globals.pixrnd + 1) >> sp_globals.pixshift; + + /* let the minimum be the larger of these two values */ + if (bmap_min > sp_globals.clip_xmin) + sp_globals.clip_xmin = bmap_min; + + /* normalize the x value to new xorgin */ + sp_globals.clip_xmin -= sp_globals.xmin; + } + if (sp_globals.specs.flags & CLIP_BOTTOM) + { + sp_globals.clip_xmax = (fix31)((fix31)(-1 * EM_BOT) * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_xmax = sp_globals.clip_xmax >> sp_globals.multshift; + bmap_max = (sp_globals.bmap_xmax + sp_globals.pixrnd) >> sp_globals.pixshift; + + /* let the max be the lesser of these two values */ + if (bmap_max < sp_globals.clip_xmax) + { + sp_globals.xmax = bmap_max; + sp_globals.clip_xmax = bmap_max; + } + else + sp_globals.xmax = sp_globals.clip_xmax; + + /* normalize the x value to new x origin */ + sp_globals.clip_xmax -= sp_globals.xmin; + } + /* compute y clip values */ + sp_globals.clip_ymax = ((sp_globals.set_width.y+32768L) >> 16); + if ((sp_globals.specs.flags & CLIP_TOP) && + (sp_globals.ymax > sp_globals.clip_ymax)) + sp_globals.ymax = sp_globals.clip_ymax; + sp_globals.clip_ymin = 0; + if ((sp_globals.specs.flags & CLIP_BOTTOM) && + (sp_globals.ymin < sp_globals.clip_ymin)) + sp_globals.ymin = sp_globals.clip_ymin; + break; + default: /* this is for zero degree rotation and arbitrary rotation */ + if (sp_globals.specs.flags & CLIP_TOP) + { + sp_globals.clip_ymax = (fix31)((fix31)EM_TOP * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_ymax = sp_globals.clip_ymax >> sp_globals.multshift; + bmap_max = (sp_globals.bmap_ymax + sp_globals.pixrnd) >> sp_globals.pixshift; + if (bmap_max > sp_globals.clip_ymax) + sp_globals.ymax = bmap_max; + else + sp_globals.ymax = sp_globals.clip_ymax; + } + if (sp_globals.specs.flags & CLIP_BOTTOM) + { + sp_globals.clip_ymin = (fix31)((fix31)(-1 * EM_BOT) * sp_globals.tcb0.yppo + ((1<<sp_globals.multshift)/2)); + sp_globals.clip_ymin = sp_globals.clip_ymin >> sp_globals.multshift; + sp_globals.clip_ymin = - sp_globals.clip_ymin; + bmap_min = (sp_globals.bmap_ymin + sp_globals.pixrnd + 1) >> sp_globals.pixshift; + if (bmap_min < sp_globals.clip_ymin) + sp_globals.ymin = sp_globals.clip_ymin; + else + sp_globals.ymin = bmap_min; + } + sp_globals.clip_xmin = -sp_globals.xmin; + sp_globals.clip_xmax = ((sp_globals.set_width.x+32768L) >> 16) - + sp_globals.xmin; + break; + } +if ( !(sp_globals.specs.flags & CLIP_TOP)) +#endif + sp_globals.ymax = (sp_globals.bmap_ymax + sp_globals.pixrnd) >> sp_globals.pixshift; + +#if INCL_CLIPPING +if ( !(sp_globals.specs.flags & CLIP_BOTTOM)) +#endif + sp_globals.ymin = (sp_globals.bmap_ymin + sp_globals.pixrnd + 1) >> sp_globals.pixshift; + } + else + { + sp_globals.ymin = sp_globals.ymax = 0; + } + + /* add in the rounded out part (from xform.) of the left edge */ + if (sp_globals.tcb.xmode == 0) /* for X pix is function of X orus only add the round */ + xorg = (((fix31)sp_globals.xmin << 16) + (sp_globals.rnd_xmin << sp_globals.poshift)); + else + if (sp_globals.tcb.xmode == 1) /* for X pix is function of -X orus only, subtr. round */ + xorg = (((fix31)sp_globals.xmin << 16) - (sp_globals.rnd_xmin << sp_globals.poshift)) ; + else + xorg = (fix31)sp_globals.xmin << 16; /* for other cases don't use round on x */ + + if (sp_globals.tcb.ymode == 2) /* for Y pix is function of X orus only, add round error */ + yorg = (((fix31)sp_globals.ymin << 16) + (sp_globals.rnd_xmin << sp_globals.poshift)); + else + if (sp_globals.tcb.ymode == 3) /* for Y pix is function of -X orus only, sub round */ + yorg = (((fix31)sp_globals.ymin << 16) - (sp_globals.rnd_xmin << sp_globals.poshift)); + else /* all other cases have no round error on yorg */ + yorg = (fix31)sp_globals.ymin << 16; + + open_bitmap(sp_globals.set_width.x, sp_globals.set_width.y, xorg, yorg, + sp_globals.xmax - sp_globals.xmin, sp_globals.ymax - sp_globals.ymin); + if (sp_globals.intercept_oflo) + { + sp_globals.y_band.band_min = sp_globals.ymin; + sp_globals.y_band.band_max = sp_globals.ymax; + sp_globals.x_scan_active = FALSE; + sp_globals.no_x_lists = 0; + init_intercepts_out(); + sp_globals.first_pass = FALSE; + sp_globals.extents_running = FALSE; + return FALSE; + } + else + { + sp_proc_intercepts_2d(); + close_bitmap(); + return TRUE; + } + } +else + { + if (sp_globals.intercept_oflo) + { + reduce_band_size_out(); + init_intercepts_out(); + return FALSE; + } + else + { + sp_proc_intercepts_2d(); + if (next_band_out()) + { + init_intercepts_out(); + return FALSE; + } + close_bitmap(); + return TRUE; + } + } +} +#endif + +#if INCL_2D +FUNCTION static void sp_add_intercept_2d( +GDECL +fix15 y, /* Y coordinate in relative pixel units */ + /* (0 is lowest sample in band) */ +fix15 x) /* X coordinate of intercept in subpixel units */ + +/* Called by line() to add an intercept to the intercept list structure + */ + +{ +register fix15 from; /* Insertion pointers for the linked list sort */ +register fix15 to; + +#if DEBUG +/* Bounds checking IS done in debug mode */ +if ((y >= MAX_INTERCEPTS) || (y < 0)) + { + printf("Intercept out of table!!!!! (%d)\n",y); + return; + } + +if (y >= sp_globals.no_y_lists) + { + printf(" Add x intercept(%2d, %f)\n", + y + sp_globals.x_band.band_min - sp_globals.no_y_lists, + (real)x/(real)sp_globals.onepix); + if (y > (sp_globals.no_x_lists + sp_globals.no_y_lists)) + { + printf(" Intercept too big for band!!!!!\007\n"); + return; + } + } + else + { + printf(" Add y intercept(%2d, %f)\n", y + sp_globals.y_band.band_min,(real)x/(real)sp_globals.onepix); + } + +if (y < 0) /* Y value below bottom of current band? */ + { + printf(" Intecerpt less than 0!!!\007\n"); + return; + } +#endif + +/* Store new values */ + +sp_intercepts.car[sp_globals.next_offset] = x; + +/* Find slot to insert new element (between from and to) */ + +from = y; /* Start at list head */ + +while( (to = sp_intercepts.cdr[from]) >= sp_globals.first_offset) /* Until to == end of list */ + { + if (x <= sp_intercepts.car[to]) /* If next item is larger than or same as this one... */ + goto insert_element; /* ... drop out and insert here */ + from = to; /* move forward in list */ + } + +insert_element: /* insert element "next_offset" between elements "from" */ + /* and "to" */ + +sp_intercepts.cdr[from] = sp_globals.next_offset; +sp_intercepts.cdr[sp_globals.next_offset] = to; + +if (++sp_globals.next_offset >= MAX_INTERCEPTS) /* Intercept buffer full? */ + { + sp_globals.intercept_oflo = TRUE; +/* There may be a few more calls to "add_intercept" from the current line */ +/* To avoid problems, we set next_offset to a safe value. We don't care */ +/* if the intercept table gets trashed at this point */ + sp_globals.next_offset = sp_globals.first_offset; + } +} + +#endif + +#if INCL_2D +FUNCTION static void sp_proc_intercepts_2d() +/* Called by sp_make_char to output accumulated intercept lists + * Clips output to xmin, xmax, sp_globals.ymin, ymax boundaries + */ +{ +register fix15 i; +register fix15 from, to; /* Start and end of run in pixel units + relative to left extent of character */ +register fix15 y; +register fix15 scan_line; + fix15 local_bmap_xmin; + fix15 local_bmap_xmax; + fix15 first_y, last_y; + fix15 j,k; + +#if INCL_CLIPPING +if ((sp_globals.specs.flags & CLIP_LEFT) != 0) + clipleft = TRUE; +else + clipleft = FALSE; +if ((sp_globals.specs.flags & CLIP_RIGHT) != 0) + clipright = TRUE; +else + clipright = FALSE; +if (clipleft || clipright) + { + xmax = sp_globals.clip_xmax << sp_globals.pixshift; + xmin = sp_globals.clip_xmin << sp_globals.pixshift; + } +if (!clipright) + xmax = ((sp_globals.set_width.x+32768L) >> 16); +#endif + +if (sp_globals.x_scan_active) /* If xscanning, we need to make sure we don't miss any important pixels */ + { + first_y = sp_globals.x_band.band_floor; /* start of x lists */ + last_y = sp_globals.x_band.band_ceiling; /* end of x lists */ + for (y = first_y; y != last_y; y++) /* scan all xlists */ + { + i = sp_intercepts.cdr[y]; /* Index head of intercept list */ + while (i != 0) /* Link to next intercept if present */ + { + from = sp_intercepts.car[i]; + j = i; + i = sp_intercepts.cdr[i]; /* Link to next intercept */ + if (i == 0) /* End of list? */ + { +#if DEBUG + printf("****** proc_intercepts: odd number of intercepts in x list\n"); +#endif + break; + } + to = sp_intercepts.car[i]; + k = sp_intercepts.cdr[i]; + if (((to >> sp_globals.pixshift) >= (from >> sp_globals.pixshift)) && + ((to - from) < (sp_globals.onepix + 1))) + { + from = ((fix31)to + (fix31)from - (fix31)sp_globals.onepix) >> (sp_globals.pixshift + 1); + if (from > sp_globals.y_band.band_max) + from = sp_globals.y_band.band_max; + if ((from -= sp_globals.y_band.band_min) < 0) + from = 0; + to = ((y - sp_globals.x_band.band_floor + sp_globals.x_band.band_min) + << sp_globals.pixshift) + + sp_globals.pixrnd; + sp_intercepts.car[j] = to; + sp_intercepts.car[i] = to + sp_globals.onepix; + sp_intercepts.cdr[i] = sp_intercepts.cdr[from]; + sp_intercepts.cdr[from] = j; + } + i = k; + } + } + } +#if DEBUG +printf("\nIntercept lists:\n"); +#endif + +if ((first_y = sp_globals.y_band.band_max) >= sp_globals.ymax) + first_y = sp_globals.ymax - 1; /* Clip to ymax boundary */ + +if ((last_y = sp_globals.y_band.band_min) < sp_globals.ymin) + last_y = sp_globals.ymin; /* Clip to sp_globals.ymin boundary */ + +last_y -= sp_globals.y_band.band_array_offset; + +local_bmap_xmin = sp_globals.xmin << sp_globals.pixshift; +local_bmap_xmax = (sp_globals.xmax << sp_globals.pixshift) + sp_globals.pixrnd; + +#if DEBUG +/* Print out all of the intercept info */ +scan_line = sp_globals.ymax - first_y - 1; + +for (y = first_y - sp_globals.y_band.band_min; y >= last_y; y--, scan_line++) + { + i = y; /* Index head of intercept list */ + while ((i = sp_intercepts.cdr[i]) != 0) /* Link to next intercept if present */ + { + if ((from = sp_intercepts.car[i] - local_bmap_xmin) < 0) + from = 0; /* Clip to xmin boundary */ + i = sp_intercepts.cdr[i]; /* Link to next intercept */ + if (i == 0) /* End of list? */ + { + printf("****** proc_intercepts: odd number of intercepts\n"); + break; + } + if ((to = sp_intercepts.car[i]) > sp_globals.bmap_xmax) + to = sp_globals.bmap_xmax - local_bmap_xmin; /* Clip to xmax boundary */ + else + to -= local_bmap_xmin; + printf(" Y = %2d (scanline %2d): %3.4f %3.4f:\n", + y + sp_globals.y_band.band_min, + scan_line, + (real)from / (real)sp_globals.onepix, + (real)to / (real)sp_globals.onepix); + } + } +#endif + +/* Draw the image */ +scan_line = sp_globals.ymax - first_y - 1; + +for (y = first_y - sp_globals.y_band.band_min; y >= last_y; y--, scan_line++) + { + i = y; /* Index head of intercept list */ + while ((i = sp_intercepts.cdr[i]) != 0) /* Link to next intercept if present */ + { + if ((from = sp_intercepts.car[i] - local_bmap_xmin) < 0) + from = 0; /* Clip to xmin boundary */ + i = sp_intercepts.cdr[i]; /* Link to next intercept */ + + if ((to = sp_intercepts.car[i]) > local_bmap_xmax) + to = sp_globals.bmap_xmax - local_bmap_xmin; /* Clip to xmax boundary */ + else + to -= local_bmap_xmin; +#if INCL_CLIPPING + if (clipleft) + { + if (to <= xmin) + continue; + if (from < xmin) + from = xmin; + } + if (clipright) + { + if (from >= xmax) + continue; + if (to > xmax) + to = xmax; + } +#endif + if ( (to - from) <= sp_globals.onepix) + { + from = (to + from - sp_globals.onepix) >> (sp_globals.pixshift + 1); + set_bitmap_bits(scan_line, from, from + 1); + } + else + { + set_bitmap_bits(scan_line, from >> sp_globals.pixshift, to >> sp_globals.pixshift); + } + } + } +} + +#endif |