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Diffstat (limited to 'src/Speedo/out_scrn.c')
| -rw-r--r-- | src/Speedo/out_scrn.c | 1091 |
1 files changed, 1091 insertions, 0 deletions
diff --git a/src/Speedo/out_scrn.c b/src/Speedo/out_scrn.c new file mode 100644 index 0000000..3d04db6 --- /dev/null +++ b/src/Speedo/out_scrn.c @@ -0,0 +1,1091 @@ +/* $Xorg: out_scrn.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 _ 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 + + +#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 + + +#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 + +#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) +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); +} + +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 + + +#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 + +#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 + + + +#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 + +#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 + +#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 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 |