--- /dev/null
+/* $XConsortium: out_scrn.c,v 1.5 94/02/10 14:15:39 gildea 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 _ S C R N . C *****************************
+ * *
+ * This is an output module for screen-writer mode. *
+ * *
+ *****************************************************************************/
+
+
+#include "spdo_prv.h" /* General definitions for Speedo */
+
+#define DEBUG 0
+#define LOCAL static
+#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 PROTOS_AVAIL
+static void sp_add_intercept_screen(PROTO_DECL2 fix15 y,fix31 x);
+static void sp_proc_intercepts_screen(PROTO_DECL1);
+#else
+static void sp_add_intercept_screen();
+static void sp_proc_intercepts_screen();
+#endif
+
+\f
+#if INCL_SCREEN
+FUNCTION boolean init_screen(specsarg)
+GDECL
+specs_t FONTFAR *specsarg;
+/*
+ * init_out0() is called by sp_set_specs() to initialize the output module.
+ * Returns TRUE if output module can accept requested specifications.
+ * Returns FALSE otherwise.
+ */
+{
+#if DEBUG
+printf("INIT_SCREEN()\n");
+#endif
+return (TRUE);
+}
+#endif
+
+
+#if INCL_SCREEN
+FUNCTION boolean begin_char_screen(Psw, Pmin, Pmax)
+GDECL
+point_t Psw;
+point_t Pmin;
+point_t Pmax;
+/* Called once at the start of the character generation process
+ */
+{
+#if DEBUG
+printf("BEGIN_CHAR_SCREEN(%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
+if (sp_globals.pixshift > 8)
+ sp_intercepts.fracpix = sp_globals.onepix << (8 - sp_globals.pixshift);
+else
+ sp_intercepts.fracpix = sp_globals.onepix >> (sp_globals.pixshift - 8);
+
+init_char_out(Psw,Pmin,Pmax);
+
+return TRUE;
+}
+#endif
+
+\f
+#if INCL_SCREEN
+FUNCTION void begin_contour_screen(P1, outside)
+GDECL
+point_t P1;
+boolean outside;
+/* Called at the start of each contour
+ */
+{
+
+#if DEBUG
+printf("BEGIN_CONTOUR_SCREEN(%3.1f, %3.1f, %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;
+sp_globals.y_pxl = (sp_globals.y0_spxl + sp_globals.pixrnd) >> sp_globals.pixshift;
+}
+#endif
+\f
+#if INCL_SCREEN
+FUNCTION void curve_screen(P1, P2, P3, depth)
+GDECL
+point_t P1, P2, P3;
+fix15 depth;
+{
+fix31 X0;
+fix31 Y0;
+fix31 X1;
+fix31 Y1;
+fix31 X2;
+fix31 Y2;
+fix31 X3;
+fix31 Y3;
+#if DEBUG
+printf("CURVE_SCREEN(%6.4f, %6.4f, %6.4f, %6.4f, %6.4f, %6.4f)\n",
+ (real)P1.x / (real)sp_globals.onepix, (real)P1.y / (real)sp_globals.onepix,
+ (real)P2.x / (real)sp_globals.onepix, (real)P2.y / (real)sp_globals.onepix,
+ (real)P3.x / (real)sp_globals.onepix, (real)P3.y / (real)sp_globals.onepix);
+#endif
+
+
+if (sp_globals.extents_running) /* Accumulate actual character extents if required */
+ {
+ if (P3.x > sp_globals.bmap_xmax)
+ sp_globals.bmap_xmax = P3.x;
+ if (P3.x < sp_globals.bmap_xmin)
+ sp_globals.bmap_xmin = P3.x;
+ if (P3.y > sp_globals.bmap_ymax)
+ sp_globals.bmap_ymax = P3.y;
+ if (P3.y < sp_globals.bmap_ymin)
+ sp_globals.bmap_ymin = P3.y;
+ }
+
+X0 = ((fix31)sp_globals.x0_spxl << sp_globals.poshift) + (fix31)32768;
+Y0 = ((fix31)sp_globals.y0_spxl << sp_globals.poshift) + (fix31)32768;
+X1 = ((fix31)P1.x << sp_globals.poshift) + (fix31)32768;
+Y1 = ((fix31)P1.y << sp_globals.poshift) + (fix31)32768;
+X2 = ((fix31)P2.x << sp_globals.poshift) + (fix31)32768;
+Y2 = ((fix31)P2.y << sp_globals.poshift) + (fix31)32768;
+X3 = ((fix31)P3.x << sp_globals.poshift) + (fix31)32768;
+Y3 = ((fix31)P3.y << sp_globals.poshift) + (fix31)32768;
+
+if (((Y0 - Y3) * sp_globals.tcb.mirror) > 0)
+ {
+ sp_intercepts.leftedge = LEFT_INT;
+ }
+else
+ {
+ sp_intercepts.leftedge = 0;
+ }
+
+scan_curve_screen(X0,Y0,X1,Y1,X2,Y2,X3,Y3);
+sp_globals.x0_spxl = P3.x;
+sp_globals.y0_spxl = P3.y;
+sp_globals.y_pxl = (P3.y + sp_globals.pixrnd) >> sp_globals.pixshift; /* calculate new end-scan sp_globals.line */
+}
+
+FUNCTION void scan_curve_screen(X0,Y0,X1,Y1,X2,Y2,X3,Y3)\f
+GDECL
+fix31 X0,Y0,X1,Y1,X2,Y2,X3,Y3;
+/* Called for each curve in the transformed character if curves out enabled
+ */
+{
+fix31 Pmidx;
+fix31 Pmidy;
+fix31 Pctrl1x;
+fix31 Pctrl1y;
+fix31 Pctrl2x;
+fix31 Pctrl2y;
+
+#if DBGCRV
+printf("SCAN_CURVE_SCREEN(%6.4f, %6.4f, %6.4f, %6.4f, %6.4f, %6.4f, %6.4f, %6.4f)\n",
+ (real)(X0-32768) / 65536.0, (real)(Y0-32768) / 65536.0,
+ (real)(X1-32768) / 65536.0, (real)(Y1-32768) / 65536.0,
+ (real)(X2-32768) / 65536.0, (real)(Y2-32768) / 65536.0,
+ (real)(X3-32768) / 65536.0, (real)(Y3-32768) / 65536.0);
+#endif
+
+if (((Y3 >> 16)) == (Y0 >> 16) || (Y3+1) == Y0 || Y3 == (Y0+1))
+ {
+ return;
+ }
+if ((X3 >> 16) == (X0 >> 16))
+ {
+ vert_line_screen(X3,(Y0>>16),(Y3>>16));
+ return;
+ }
+Pmidx = (X0 + (X1 + X2) * 3 + X3 + 4 ) >> 3;
+Pmidy = (Y0 + (Y1 + Y2) * 3 + Y3 + 4 ) >> 3;
+
+Pctrl1x = (X0 + X1 + 1 ) >> 1;
+Pctrl1y = (Y0 + Y1 + 1) >> 1;
+Pctrl2x = (X0 + (X1 << 1) + X2 + 2 ) >> 2;
+Pctrl2y = (Y0 + (Y1 << 1) + Y2 + 2 ) >> 2;
+scan_curve_screen(X0,Y0, Pctrl1x, Pctrl1y, Pctrl2x,Pctrl2y, Pmidx,Pmidy);
+
+Pctrl1x = (X1 + (X2 << 1) + X3 + 2 ) >> 2;
+Pctrl1y = (Y1 + (Y2 << 1) + Y3 + 2 ) >> 2;
+Pctrl2x = (X2 + X3 + 1 ) >> 1;
+Pctrl2y = (Y2 + Y3 + 1 ) >> 1;
+scan_curve_screen(Pmidx,Pmidy, Pctrl1x,Pctrl1y, Pctrl2x,Pctrl2y, X3,Y3);
+}
+\f
+FUNCTION void vert_line_screen(x,y1,y2)
+GDECL
+fix31 x;
+fix15 y1, y2;
+{
+
+#if DBGCRV
+printf("VERT_LINE_SCREEN(%6.4f, %6.4f, %6.4f)\n",
+ (real)(x - 32768) / 65536.0,
+ (real)(y1 - 32768) / 65536.0,
+ (real)(y2 - 32768) / 65536.0);
+#endif
+
+if (sp_globals.intercept_oflo)
+ return;
+
+if (y1 > y2) /* Line goes downwards ? */
+ {
+ if (y1 > (sp_globals.y_band.band_max + 1)) /* Start point above top of band? */
+ y1 = sp_globals.y_band.band_max + 1; /* Adjust start point to top of band */
+ if (y2 < sp_globals.y_band.band_min) /* End point below bottom of band? */
+ y2 = sp_globals.y_band.band_min; /* Adjust end point bottom of band */
+
+ y1 -= sp_globals.y_band.band_min; /* Translate start point to band origin */
+ y2 -= sp_globals.y_band.band_min; /* Translate end point to band origin */
+
+ while (y2 < y1) /* At least one intercept left? */
+ {
+ sp_add_intercept_screen(--y1, x); /* Add intercept */
+ }
+ }
+else if (y2 > y1) /* Line goes upwards ? */
+ {
+ if (y1 < sp_globals.y_band.band_min) /* Start point below bottom of band? */
+ y1 = sp_globals.y_band.band_min; /* Adjust start point to bottom of band */
+ if (y2 > (sp_globals.y_band.band_max + 1)) /* End point above top of band? */
+ y2 = sp_globals.y_band.band_max + 1; /* Adjust end point to top of band */
+
+ y1 -= sp_globals.y_band.band_min; /* Translate start point to band origin */
+ y2 -= sp_globals.y_band.band_min; /* Translate end point to band origin */
+
+ while (y1 < y2) /* At least one intercept left? */
+ {
+ sp_add_intercept_screen(y1++, x); /* Add intercept */
+ }
+ }
+
+
+}
+
+#endif
+\f
+
+#if INCL_SCREEN
+FUNCTION void line_screen(P1)
+GDECL
+point_t P1;
+/* Called for each vector in the transformed character
+ */
+{
+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 x0,y0,x1,y1; /* PIX.FRAC start and endpoints */
+
+x0 = sp_globals.x0_spxl; /* get start of line (== current point) */
+y0 = sp_globals.y0_spxl;
+sp_globals.x0_spxl = x1 = P1.x; /* end of line */
+sp_globals.y0_spxl = y1 = P1.y; /* (also update current point to end of line) */
+
+yc = sp_globals.y_pxl; /* current scan line = end of last line */
+sp_globals.y_pxl = (y1 + sp_globals.pixrnd) >> sp_globals.pixshift; /* calculate new end-scan sp_globals.line */
+
+
+#if DEBUG
+printf("LINE_SCREEN(%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) return;
+
+if ((how_many_y = sp_globals.y_pxl - yc) == 0) return; /* Don't draw a null line */
+
+xc = (fix31)(x0 + sp_globals.pixrnd) << (16 - sp_globals.pixshift); /* Original x coordinate with built in */
+ /* rounding. 16.16 form */
+
+if (how_many_y < 0)
+ {
+ yc--; /* Predecrment downward lines */
+ }
+
+if ((how_many_y * sp_globals.tcb.mirror) < 0)
+ {
+ sp_intercepts.leftedge = LEFT_INT;
+ }
+else
+ {
+ sp_intercepts.leftedge = 0;
+ }
+
+if (yc > sp_globals.y_band.band_max) /* Is start point above band? */
+ {
+ if (sp_globals.y_pxl > sp_globals.y_band.band_max) return; /* line has to go down! */
+ how_many_y = sp_globals.y_pxl - (yc = sp_globals.y_band.band_max) - 1; /* Yes, limit it */
+ }
+
+if (yc < sp_globals.y_band.band_min) /* Is start point below band? */
+ {
+ if (sp_globals.y_pxl < sp_globals.y_band.band_min) return; /* line has to go up! */
+ how_many_y = sp_globals.y_pxl - (yc = sp_globals.y_band.band_min); /* Yes, limit it */
+ }
+
+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 independant. */
+
+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)-1) &&
+ (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 shift it to be a 16.16 delta */
+
+xc += ((fix31)temp1 * dx_dy) >> sp_globals.pixshift;
+
+skip_calc:
+
+yc -= sp_globals.y_band.band_min; /* yc is now an offset relative to the band */
+
+if (how_many_y < 0)
+ { /* Vector down */
+ if ((how_many_y += yc + 1) < 0) how_many_y = 0; /* can't go below 0 */
+ while(yc >= how_many_y)
+ {
+ sp_add_intercept_screen(yc--,xc);
+ xc -= dx_dy;
+ }
+ }
+ else
+ { /* Vector up */
+ /* check to see that line doesn't extend beyond top of band */
+ if ((how_many_y += yc) > sp_globals.no_y_lists) how_many_y = sp_globals.no_y_lists;
+ while(yc != how_many_y)
+ {
+ sp_add_intercept_screen(yc++,xc);
+ xc += dx_dy;
+ }
+ }
+}
+#endif
+\f
+#if INCL_SCREEN
+FUNCTION void end_contour_screen()
+GDECL
+/* Called after the last vector in each contour
+ */
+{
+#if DEBUG
+printf("END_CONTOUR_SCREEN()\n");
+#endif
+sp_intercepts.inttype[sp_globals.next_offset-1] |= END_INT;
+}
+#endif
+
+
+\f
+#if INCL_SCREEN
+FUNCTION boolean end_char_screen()
+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_SCREEN()\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;
+ init_intercepts_out();
+ sp_globals.first_pass = FALSE;
+ sp_globals.extents_running = FALSE;
+ return FALSE;
+ }
+ else
+ {
+ sp_proc_intercepts_screen();
+ close_bitmap();
+ return TRUE;
+ }
+ }
+else
+ {
+ if (sp_globals.intercept_oflo)
+ {
+ reduce_band_size_out();
+ init_intercepts_out();
+ return FALSE;
+ }
+ else
+ {
+ sp_proc_intercepts_screen();
+ if (next_band_out())
+ {
+ init_intercepts_out();
+ return FALSE;
+ }
+ close_bitmap();
+ return TRUE;
+ }
+ }
+}
+#endif
+\f
+#if INCL_SCREEN
+FUNCTION LOCAL void sp_add_intercept_screen(y, x)
+GDECL
+fix15 y; /* Y coordinate in relative pixel units */
+ /* (0 is lowest sample in band) */
+fix31 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;
+register fix15 xloc;
+register fix15 xfrac;
+
+#if DEBUG
+printf(" Add intercept(%2d, %x)\n", y + sp_globals.y_band.band_min, x);
+
+/* Bounds checking IS done in debug mode */
+if (y < 0) /* Y value below bottom of current band? */
+ {
+ printf(" Intecerpt less than 0!!!\007\n");
+ return;
+ }
+
+if (y > (sp_globals.no_y_lists - 1)) /* Y value above top of current band? */
+ {
+ printf(" Intercept too big for band!!!!!\007\n");
+ return;
+ }
+#endif
+
+/* Store new values */
+
+sp_intercepts.car[sp_globals.next_offset] = xloc = (fix15)(x >> 16);
+sp_intercepts.inttype[sp_globals.next_offset] = sp_intercepts.leftedge | (xfrac = ((x >> 8) & FRACTION));
+
+/* Find slot to insert new element (between from and to) */
+
+from = y; /* Start at list head */
+
+while( (to = sp_intercepts.cdr[from]) != 0) /* Until to == end of list */
+ {
+ if (xloc < sp_intercepts.car[to]) /* If next item is larger than or same as this one... */
+ goto insert_element; /* ... drop out and insert here */
+ else if (xloc == sp_intercepts.car[to] && xfrac < (sp_intercepts.inttype[to] & FRACTION))
+ goto insert_element; /* ... drop out and insert here */
+ from = to; /* move forward in list */
+ }
+
+insert_element: /* insert element "sp_globals.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
+\f
+#if INCL_SCREEN
+FUNCTION LOCAL void sp_proc_intercepts_screen()
+GDECL
+
+/* Called by sp_make_char to output accumulated intercept lists
+ * Clips output to sp_globals.xmin, sp_globals.xmax, sp_globals.ymin, sp_globals.ymax boundaries
+ */
+{
+register fix15 i,j, jplus1, iminus1;
+fix15 k,nextk, previ;
+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 first_y, last_y;
+ fix15 xsave;
+ fix15 xmin, xmax;
+ boolean clipleft, clipright;
+
+
+fix15 diff;
+
+#if DEBUG
+printf("\nPROC_INTERCEPTS_SCREEN: Intercept lists before:\n");
+#endif
+
+#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.xmin;
+ xmin = sp_globals.clip_xmin + sp_globals.xmin;
+ }
+if (!clipright)
+ xmax = ((sp_globals.set_width.x+32768L) >> 16);
+#endif
+
+if ((first_y = sp_globals.y_band.band_max) >= sp_globals.ymax)
+ first_y = sp_globals.ymax - 1; /* Clip to sp_globals.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_min;
+
+#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] - sp_globals.xmin) < 0)
+ from = 0; /* Clip to sp_globals.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.xmax)
+ to = sp_globals.xmax - sp_globals.xmin; /* Clip to sp_globals.xmax boundary */
+ else
+ to -= sp_globals.xmin;
+ printf(" Y = %2d (scanline %2d): %d %d:\n",
+ y + sp_globals.y_band.band_min, scan_line, from, to);
+ }
+ }
+#endif
+
+/* CHECK INTERCEPT LIST FOR DROPOUT AND WINDING, FIX IF NECESSARY */
+
+for (y = first_y - sp_globals.y_band.band_min; y >= last_y; y--)
+ {
+ previ = y;
+ i = sp_intercepts.cdr[y]; /* Index head of intercept list */
+ while (i != 0) /* Link to next intercept if present */
+ {
+ j = i;
+ i = sp_intercepts.cdr[i]; /* Link to next intercept */
+ if (sp_intercepts.inttype[i] & LEFT_INT)
+ {
+ if (sp_intercepts.inttype[j] & LEFT_INT)
+ {
+ do { i = sp_intercepts.cdr[i]; } while (sp_intercepts.inttype[i] & LEFT_INT);
+ do { i = sp_intercepts.cdr[i]; } while (sp_intercepts.cdr[i] && !(sp_intercepts.inttype[sp_intercepts.cdr[i]] & LEFT_INT));
+ sp_intercepts.cdr[j] = i;
+ }
+ else
+ {
+ xsave = sp_intercepts.car[j];
+ sp_intercepts.car[j] = sp_intercepts.car[i];
+ sp_intercepts.car[i] = xsave;
+
+ xsave = sp_intercepts.inttype[j];
+ sp_intercepts.inttype[j] = sp_intercepts.inttype[i] & FRACTION;
+ sp_intercepts.inttype[i] = xsave | LEFT_INT;
+
+ sp_intercepts.cdr[previ] = i;
+ sp_intercepts.cdr[j] = sp_intercepts.cdr[i];
+ sp_intercepts.cdr[i] = j;
+ i = j;
+ j = sp_intercepts.cdr[previ];
+ }
+ }
+
+ if (sp_intercepts.car[j] < sp_globals.xmin)
+ sp_intercepts.car[j] = sp_globals.xmin; /* Clip to sp_globals.xmin boundary */
+
+ if (sp_intercepts.car[i] > sp_globals.xmax)
+ sp_intercepts.car[i] = sp_globals.xmax;
+
+ if (sp_intercepts.car[j] >= sp_intercepts.car[i])
+ {
+ if ((ufix16)(sp_intercepts.inttype[j] & FRACTION) + (ufix16)(sp_intercepts.inttype[i] & FRACTION) > sp_intercepts.fracpix)
+ ++sp_intercepts.car[i];
+ else
+ --sp_intercepts.car[j];
+ }
+ if (sp_globals.first_pass)
+ {
+ if (sp_intercepts.inttype[i-1] & END_INT)
+ {
+ for (iminus1 = i+1; !(sp_intercepts.inttype[iminus1] & END_INT); iminus1++)
+ ;
+ }
+ else
+ iminus1 = i-1;
+
+ if (sp_intercepts.inttype[j] & END_INT)
+ {
+ for (jplus1 = j-1; !(sp_intercepts.inttype[jplus1] & END_INT); jplus1--)
+ ;
+ jplus1++;
+ }
+ else
+ jplus1 = j+1;
+
+ if ((sp_intercepts.inttype[iminus1] & LEFT_INT))
+ {
+ if ( sp_intercepts.car[jplus1] > sp_intercepts.car[i])
+ {
+ diff = sp_intercepts.car[jplus1] - sp_intercepts.car[i];
+ sp_intercepts.car[i] += diff/2;
+ sp_intercepts.car[jplus1] -= diff/2;
+ if (diff & 1)
+ {
+ if ((ufix16)(sp_intercepts.inttype[i] & FRACTION) + (ufix16)(sp_intercepts.inttype[jplus1] & FRACTION) > sp_intercepts.fracpix)
+ sp_intercepts.car[i] ++;
+ else
+ sp_intercepts.car[jplus1]--;
+ }
+ }
+ }
+ else if (!(sp_intercepts.inttype[jplus1] & LEFT_INT))
+ {
+ if (sp_intercepts.car[iminus1] < sp_intercepts.car[j])
+ {
+ diff = sp_intercepts.car[j] - sp_intercepts.car[iminus1];
+ sp_intercepts.car[j] -= diff/2;
+ sp_intercepts.car[iminus1] += diff/2;
+ if (diff & 1)
+ {
+ if ((ufix16)(sp_intercepts.inttype[j] & FRACTION) +
+ (ufix16)(sp_intercepts.inttype[iminus1] & FRACTION) > sp_intercepts.fracpix)
+ sp_intercepts.car[iminus1]++;
+ else
+ sp_intercepts.car[j]--;
+ }
+ }
+ }
+ if (sp_globals.tcb.mirror == -1)
+ {
+ if (sp_intercepts.inttype[j-1] & END_INT)
+ {
+ for (jplus1 = j+1; !(sp_intercepts.inttype[jplus1] & END_INT); jplus1++)
+ ;
+ }
+ else
+ {
+ jplus1 = j-1;
+ }
+ }
+
+ if (!(sp_intercepts.inttype[jplus1] & LEFT_INT) &&
+ sp_intercepts.car[j] > sp_intercepts.car[jplus1])
+ {
+ k = sp_intercepts.cdr[y - 1];
+ while (k > 0)
+ {
+ nextk = sp_intercepts.cdr[k];
+ if (!(sp_intercepts.inttype[k] & LEFT_INT) &&
+ (sp_intercepts.inttype[nextk] & LEFT_INT) &&
+ sp_intercepts.car[nextk] > sp_intercepts.car[jplus1])
+ {
+ if ((diff=sp_intercepts.car[j] - sp_intercepts.car[k]) > 0)
+ {
+ if (diff <= (sp_intercepts.car[nextk] - sp_intercepts.car[jplus1]))
+ {
+ sp_intercepts.car[j] -= diff/2;
+ sp_intercepts.car[k] += diff/2;
+ if (diff & 1)
+ {
+ if ((ufix16)(sp_intercepts.inttype[j] & FRACTION) +
+ (ufix16)(sp_intercepts.inttype[k] & FRACTION) > sp_intercepts.fracpix)
+ sp_intercepts.car[j]--;
+ else
+ sp_intercepts.car[k]++;
+ }
+ }
+ else
+ {
+ diff = sp_intercepts.car[nextk] - sp_intercepts.car[jplus1];
+ sp_intercepts.car[nextk] -= diff/2;
+ sp_intercepts.car[jplus1] += diff/2;
+ if (diff & 1)
+ {
+ if ((ufix16)(sp_intercepts.inttype[jplus1] & FRACTION) +
+ (ufix16)(sp_intercepts.inttype[nextk] & FRACTION) > sp_intercepts.fracpix)
+ sp_intercepts.car[nextk]--;
+ else
+ sp_intercepts.car[jplus1]++;
+ }
+ }
+ }
+ break;
+ }
+ k = nextk;
+ }
+ }
+ if (j > 0 && sp_intercepts.car[j-1] > sp_intercepts.car[i] && !(sp_intercepts.inttype[j-1] & END_INT))
+ {
+ diff = sp_intercepts.car[j-1] - sp_intercepts.car[i];
+ sp_intercepts.car[i] += diff/2;
+ sp_intercepts.car[j-1] -= diff/2;
+ if (diff & 1)
+ {
+ if ((ufix16)(sp_intercepts.inttype[i] & FRACTION) + (ufix16)(sp_intercepts.inttype[j-1] & FRACTION) > sp_intercepts.fracpix)
+ sp_intercepts.car[i]++;
+ else
+ sp_intercepts.car[j-1]--;
+ }
+ }
+ if (sp_intercepts.car[i+1] < sp_intercepts.car[j] && !(sp_intercepts.inttype[i] & END_INT))
+ {
+ diff = sp_intercepts.car[j] - sp_intercepts.car[i+1];
+ sp_intercepts.car[j] -= diff/2;
+ sp_intercepts.car[i+1] += diff/2;
+ if (diff & 1)
+ {
+ if ((ufix16)(sp_intercepts.inttype[j] & FRACTION) + (ufix16)(sp_intercepts.inttype[i+1] & FRACTION) > sp_intercepts.fracpix)
+ sp_intercepts.car[i+1]++;
+ else
+ sp_intercepts.car[j]--;
+ }
+
+ }
+ previ = i;
+ }
+ i = sp_intercepts.cdr[i];
+ }
+ }
+
+#if DEBUG
+printf("\nPROC_INTERCEPTS_SCREEN: Intercept lists after:\n");
+/* 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] - sp_globals.xmin) < 0)
+ from = 0; /* Clip to sp_globals.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.xmax)
+ to = sp_globals.xmax - sp_globals.xmin; /* Clip to sp_globals.xmax boundary */
+ else
+ to -= sp_globals.xmin;
+ printf(" Y = %2d (scanline %2d): %d %d:\n",
+ y + sp_globals.y_band.band_min, scan_line, from, to);
+ }
+ }
+#endif
+
+/* INTERCEPTS ALL PATCHED, NOW 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 = sp_intercepts.cdr[y]; /* Index head of intercept list */
+ while (i != 0) /* Link to next intercept if present */
+ {
+ from = sp_intercepts.car[i];
+ i = sp_intercepts.cdr[i]; /* Link to next intercept */
+ to = sp_intercepts.car[i];
+#if INCL_CLIPPING
+ if (clipleft)
+ {
+ if (to <= xmin)
+ {
+ i = sp_intercepts.cdr[i];
+ continue;
+ }
+ if (from < xmin)
+ from = xmin;
+ }
+ if (clipright)
+ {
+ if (from >= xmax)
+ {
+ i = sp_intercepts.cdr[i];
+ continue;
+ }
+ if (to > xmax)
+ to = xmax;
+ }
+#endif
+ set_bitmap_bits(scan_line, from-sp_globals.xmin, to-sp_globals.xmin);
+ i = sp_intercepts.cdr[i];
+ }
+ }
+}
+
+#endif
projects / rdpsrv / blobdiff