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+/* $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.
+
+*/
+
+/*************************** O U T _ B L 2 D . C *****************************
+ * *
+ * This is an output module for screen writer using two dimensional scanning *
+ ****************************************************************************/
+
+
+#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
+#if PROTOS_AVAIL
+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);
+#else
+static void sp_add_intercept_2d();
+static void sp_proc_intercepts_2d();
+static void sp_draw_vector_to_2d();
+#endif
+#endif
+
+#if INCL_2D
+FUNCTION boolean init_2d(specsarg)
+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(Psw, Pmin, Pmax)
+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(P1, outside)
+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(P1)
+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(x0, y0, x1, y1, band)
+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()
+GDECL
+/* 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(y, x)
+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()
+GDECL
+/* 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
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 03:09:35 +0000