summaryrefslogtreecommitdiff
path: root/src/Speedo/set_spcs.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/Speedo/set_spcs.c')
-rw-r--r--src/Speedo/set_spcs.c769
1 files changed, 769 insertions, 0 deletions
diff --git a/src/Speedo/set_spcs.c b/src/Speedo/set_spcs.c
new file mode 100644
index 0000000..d060a4b
--- /dev/null
+++ b/src/Speedo/set_spcs.c
@@ -0,0 +1,769 @@
+/* $Xorg: set_spcs.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.
+
+*/
+
+
+/*************************** S E T _ S P C S . C *****************************
+ * *
+ * This module implements all sp_set_specs() functionality. *
+ * *
+ ****************************************************************************/
+#define SET_SPCS
+#include "spdo_prv.h" /* General definitions for Speedo */
+#include "keys.h"
+
+#define DEBUG 0
+
+#if DEBUG
+#include <stdio.h>
+#define SHOW(X) printf("X = %d\n", X)
+#else
+#define SHOW(X)
+#endif
+
+/***** GLOBAL VARIABLES *****/
+
+/***** GLOBAL FUNCTIONS *****/
+
+/****** EXTERNAL VARIABLES *****/
+
+/***** STATIC VARIABLES *****/
+
+
+/****** STATIC FUNCTIONS *****/
+
+#if PROTOS_AVAIL
+static boolean sp_setup_consts(PROTO_DECL2 fix15 xmin, fix15 xmax,
+ fix15 ymin, fix15 ymax);
+static void sp_setup_tcb(PROTO_DECL2 tcb_t GLOBALFAR *ptcb);
+static fix15 sp_setup_mult(PROTO_DECL2 fix31 input_mult);
+static fix31 sp_setup_offset(PROTO_DECL2 fix31 input_offset);
+#else
+static void sp_setup_tcb(); /* Set up transformation control block */
+static fix15 sp_setup_mult(); /* Convert mult to internal form */
+static fix31 sp_setup_offset(); /* Convert offset to internal form */
+static boolean sp_setup_consts(); /* Set up scaling constants */
+#endif
+
+
+
+FUNCTION boolean set_specs(specsarg)
+GDECL
+specs_t STACKFAR *specsarg; /* Bundle of conversion specifications */
+/*
+ * Called by host software to set character generation specifications
+ */
+{
+fix31 offcd; /* Offset to start of character directory */
+fix31 ofcns; /* Offset to start of constraint data */
+fix31 cd_size; /* Size of character directory */
+fix31 no_bytes_min; /* Min number of bytes in font buffer */
+ufix16 font_id; /* Font ID */
+ufix16 private_off; /* offset to private header */
+fix15 xmin; /* Minimum X ORU value in font */
+fix15 xmax; /* Maximum X ORU value in font */
+fix15 ymin; /* Minimum Y ORU value in font */
+fix15 ymax; /* Maximum Y ORU value in font */
+
+sp_globals.specs_valid = FALSE; /* Flag specs not valid */
+
+sp_globals.specs = *specsarg; /* copy specs structure into sp_globals */
+sp_globals.pspecs = &sp_globals.specs;
+sp_globals.font = *sp_globals.pspecs->pfont;
+sp_globals.pfont = &sp_globals.font;
+sp_globals.font_org = sp_globals.font.org;
+
+if (read_word_u(sp_globals.font_org + FH_FMVER + 4) != 0x0d0a)
+ {
+ report_error(4); /* Font format error */
+ return FALSE;
+ }
+if (read_word_u(sp_globals.font_org + FH_FMVER + 6) != 0x0000)
+ {
+ report_error(4); /* Font format error */
+ return FALSE;
+ }
+
+if (get_cust_no(*specsarg->pfont) == 0)
+ {
+ sp_globals.key32 = 0;
+ sp_globals.key4 = 0;
+ sp_globals.key6 = 0;
+ sp_globals.key7 = 0;
+ sp_globals.key8 = 0;
+ }
+else
+ {
+ sp_globals.key32 = (KEY3 << 8) | KEY2;
+ sp_globals.key4 = KEY4;
+ sp_globals.key6 = KEY6;
+ sp_globals.key7 = KEY7;
+ sp_globals.key8 = KEY8;
+ }
+
+
+sp_globals.no_chars_avail = read_word_u(sp_globals.font_org + FH_NCHRF);
+
+/* Read sp_globals.orus per em from font header */
+sp_globals.orus_per_em = read_word_u(sp_globals.font_org + FH_ORUPM);
+
+/* compute address of private header */
+private_off = read_word_u(sp_globals.font_org + FH_HEDSZ);
+sp_globals.hdr2_org = sp_globals.font_org + private_off;
+
+/* set metric resolution if specified, default to outline res otherwise */
+if (private_off > EXP_FH_METRES)
+ {
+ sp_globals.metric_resolution = read_word_u(sp_globals.font_org + EXP_FH_METRES);
+ }
+else
+ {
+ sp_globals.metric_resolution = sp_globals.orus_per_em;
+ }
+
+#if INCL_METRICS
+sp_globals.kern.tkorg = sp_globals.font_org + read_long(sp_globals.hdr2_org + FH_OFFTK);
+sp_globals.kern.pkorg = sp_globals.font_org + read_long(sp_globals.hdr2_org + FH_OFFPK);
+sp_globals.kern.no_tracks = read_word_u(sp_globals.font_org + FH_NKTKS);
+sp_globals.kern.no_pairs = read_word_u(sp_globals.font_org + FH_NKPRS);
+#endif
+
+offcd = read_long(sp_globals.hdr2_org + FH_OFFCD); /* Read offset to character directory */
+ofcns = read_long(sp_globals.hdr2_org + FH_OFCNS); /* Read offset to constraint data */
+cd_size = ofcns - offcd;
+if ((((sp_globals.no_chars_avail << 1) + 3) != cd_size) &&
+ (((sp_globals.no_chars_avail * 3) + 4) != cd_size))
+ {
+ report_error(4); /* Font format error */
+ return FALSE;
+ }
+
+#if INCL_LCD /* Dynamic character data load suppoorted? */
+#if INCL_METRICS
+no_bytes_min = read_long(sp_globals.hdr2_org + FH_OCHRD); /* Offset to character data */
+#else /* Dynamic character data load not supported? */
+no_bytes_min = read_long(sp_globals.hdr2_org + FH_OFFTK); /* Offset to track kerning data */
+#endif
+#else /* Dynamic character data load not supported? */
+no_bytes_min = read_long(sp_globals.hdr2_org + FH_NBYTE); /* Offset to EOF + 1 */
+#endif
+
+sp_globals.font_buff_size = sp_globals.pfont->no_bytes;
+if (sp_globals.font_buff_size < no_bytes_min) /* Minimum data not loaded? */
+ {
+ report_error(1); /* Insufficient font data loaded */
+ return FALSE;
+ }
+
+sp_globals.pchar_dir = sp_globals.font_org + offcd;
+sp_globals.first_char_idx = read_word_u(sp_globals.font_org + FH_FCHRF);
+
+/* Register font name with sp_globals.constraint mechanism */
+#if INCL_RULES
+font_id = read_word_u(sp_globals.font_org + FH_FNTID);
+if (!(sp_globals.constr.font_id_valid) || (sp_globals.constr.font_id != font_id))
+ {
+ sp_globals.constr.font_id = font_id;
+ sp_globals.constr.font_id_valid = TRUE;
+ sp_globals.constr.data_valid = FALSE;
+ }
+sp_globals.constr.org = sp_globals.font_org + ofcns;
+sp_globals.constr.active = ((sp_globals.pspecs->flags & CONSTR_OFF) == 0);
+#endif
+
+/* Set up sliding point constants */
+/* Set pixel shift to accomodate largest transformed pixel value */
+xmin = read_word_u(sp_globals.font_org + FH_FXMIN);
+xmax = read_word_u(sp_globals.font_org + FH_FXMAX);
+ymin = read_word_u(sp_globals.font_org + FH_FYMIN);
+ymax = read_word_u(sp_globals.font_org + FH_FYMAX);
+
+if (!sp_setup_consts(xmin,xmax,ymin,ymax))
+ {
+ report_error(3); /* Requested specs out of range */
+ return FALSE;
+ }
+#if INCL_ISW
+/* save the value of the max x oru that the fixed point constants are based on*/
+sp_globals.isw_xmax = xmax;
+#endif
+
+/* Setup transformation control block */
+sp_setup_tcb(&sp_globals.tcb0);
+
+
+/* Select output module */
+sp_globals.output_mode = sp_globals.pspecs->flags & 0x0007;
+
+#if INCL_USEROUT
+if (!init_userout(sp_globals.pspecs))
+#endif
+
+switch (sp_globals.output_mode)
+ {
+#if INCL_BLACK
+case MODE_BLACK: /* Output mode 0 (Black writer) */
+ sp_globals.init_out = sp_init_black;
+ sp_globals.begin_char = sp_begin_char_black;
+ sp_globals.begin_sub_char = sp_begin_sub_char_out;
+ sp_globals.begin_contour = sp_begin_contour_black;
+ sp_globals.curve = sp_curve_out;
+ sp_globals.line = sp_line_black;
+ sp_globals.end_contour = sp_end_contour_out;
+ sp_globals.end_sub_char = sp_end_sub_char_out;
+ sp_globals.end_char = sp_end_char_black;
+ break;
+#endif
+
+#if INCL_SCREEN
+case MODE_SCREEN: /* Output mode 1 (Screen writer) */
+ sp_globals.init_out = sp_init_screen;
+ sp_globals.begin_char = sp_begin_char_screen;
+ sp_globals.begin_sub_char = sp_begin_sub_char_out;
+ sp_globals.begin_contour = sp_begin_contour_screen;
+ sp_globals.curve = sp_curve_screen;
+ sp_globals.line = sp_line_screen;
+ sp_globals.end_contour = sp_end_contour_screen;
+ sp_globals.end_sub_char = sp_end_sub_char_out;
+ sp_globals.end_char = sp_end_char_screen;
+ break;
+#endif
+
+#if INCL_OUTLINE
+case MODE_OUTLINE: /* Output mode 2 (Vector) */
+ sp_globals.init_out = sp_init_outline;
+ sp_globals.begin_char = sp_begin_char_outline;
+ sp_globals.begin_sub_char = sp_begin_sub_char_outline;
+ sp_globals.begin_contour = sp_begin_contour_outline;
+ sp_globals.curve = sp_curve_outline;
+ sp_globals.line = sp_line_outline;
+ sp_globals.end_contour = sp_end_contour_outline;
+ sp_globals.end_sub_char = sp_end_sub_char_outline;
+ sp_globals.end_char = sp_end_char_outline;
+ break;
+#endif
+
+#if INCL_2D
+case MODE_2D: /* Output mode 3 */
+ sp_globals.init_out = sp_init_2d;
+ sp_globals.begin_char = sp_begin_char_2d;
+ sp_globals.begin_sub_char = sp_begin_sub_char_out;
+ sp_globals.begin_contour = sp_begin_contour_2d;
+ sp_globals.curve = sp_curve_out;
+ sp_globals.line = sp_line_2d;
+ sp_globals.end_contour = sp_end_contour_out;
+ sp_globals.end_sub_char = sp_end_sub_char_out;
+ sp_globals.end_char = sp_end_char_2d;
+ break;
+#endif
+
+default:
+ report_error(8); /* Unsupported mode requested */
+ return FALSE;
+ }
+
+ if (!fn_init_out(sp_globals.pspecs))
+ {
+ report_error(5);
+ return FALSE;
+ }
+
+
+sp_globals.curves_out = sp_globals.pspecs->flags & CURVES_OUT;
+
+if (sp_globals.pspecs->flags & BOGUS_MODE) /* Linear transformation requested? */
+ {
+ sp_globals.tcb0.xtype = sp_globals.tcb0.ytype = 4;
+ }
+else /* Intelligent transformation requested? */
+ {
+#if INCL_RULES
+#else
+ report_error(7); /* Rules requested; not supported */
+ return FALSE;
+#endif
+ }
+
+if ((sp_globals.pspecs->flags & SQUEEZE_LEFT) ||
+ (sp_globals.pspecs->flags & SQUEEZE_RIGHT) ||
+ (sp_globals.pspecs->flags & SQUEEZE_TOP) ||
+ (sp_globals.pspecs->flags & SQUEEZE_BOTTOM) )
+ {
+#if (INCL_SQUEEZING)
+#else
+ report_error(11);
+ return FALSE;
+#endif
+ }
+
+if ((sp_globals.pspecs->flags & CLIP_LEFT) ||
+ (sp_globals.pspecs->flags & CLIP_RIGHT) ||
+ (sp_globals.pspecs->flags & CLIP_TOP) ||
+ (sp_globals.pspecs->flags & CLIP_BOTTOM) )
+ {
+#if (INCL_CLIPPING)
+#else
+ report_error(11);
+ return FALSE;
+#endif
+ }
+
+sp_globals.specs_valid = TRUE;
+return TRUE;
+}
+
+
+
+#if INCL_MULTIDEV
+#if INCL_BLACK || INCL_SCREEN || INCL_2D
+FUNCTION boolean set_bitmap_device(bfuncs,size)
+GDECL
+bitmap_t *bfuncs;
+ufix16 size;
+{
+
+if (size != sizeof(sp_globals.bitmap_device))
+ return FALSE;
+
+sp_globals.bitmap_device = *bfuncs;
+sp_globals.bitmap_device_set = TRUE;
+}
+#endif
+
+#if INCL_OUTLINE
+FUNCTION boolean set_outline_device(ofuncs,size)
+GDECL
+outline_t *ofuncs;
+ufix16 size;
+{
+
+if (size != sizeof(sp_globals.outline_device))
+ return FALSE;
+
+sp_globals.outline_device = *ofuncs;
+sp_globals.outline_device_set = TRUE;
+}
+#endif
+#endif
+
+
+#ifdef old
+FUNCTION boolean sp_setup_consts(xmin, xmax, ymin, ymax)
+#else
+static FUNCTION boolean sp_setup_consts(xmin, xmax, ymin, ymax)
+#endif
+GDECL
+fix15 xmin; /* Minimum X ORU value in font */
+fix15 xmax; /* Maximum X ORU value in font */
+fix15 ymin; /* Minimum Y ORU value in font */
+fix15 ymax; /* Maximum Y ORU value in font */
+/*
+ * Sets the following constants used for fixed point arithmetic:
+ * sp_globals.multshift multipliers and products; range is 14 to 8
+ * sp_globals.pixshift pixels: range is 0 to 8
+ * sp_globals.mpshift shift from product to sub-pixels (sp_globals.multshift - sp_globals.pixshift)
+ * sp_globals.multrnd rounding for products
+ * sp_globals.pixrnd rounding for pixels
+ * sp_globals.mprnd rounding for sub-pixels
+ * sp_globals.onepix 1 pixel in shifted pixel units
+ * sp_globals.pixfix mask to eliminate fractional bits of shifted pixels
+ * sp_globals.depth_adj curve splitting depth adjustment
+ * Returns FALSE if specs are out of range
+ */
+{
+fix31 mult; /* Successive multiplier values */
+ufix32 num; /* Numerator of largest multiplier value */
+ufix32 numcopy; /* Copy of numerator */
+ufix32 denom; /* Denominator of largest multiplier value */
+ufix32 denomcopy; /* Copy of denominator */
+ufix32 pix_max; /* Maximum pixel rounding error */
+fix31 xmult; /* Coefficient of X oru value in transformation */
+fix31 ymult; /* Coefficient of Y oru value in transformation */
+fix31 offset; /* Constant in transformation */
+fix15 i; /* Loop counter */
+fix15 x, y; /* Successive corners of bounding box in ORUs */
+fix31 pixval; /* Successive pixel values multiplied by orus per em */
+fix15 xx, yy; /* Bounding box corner that produces max pixel value */
+
+/* Determine numerator and denominator of largest multiplier value */
+mult = sp_globals.pspecs->xxmult >> 16;
+if (mult < 0)
+ mult = -mult;
+num = mult;
+
+mult = sp_globals.pspecs->xymult >> 16;
+if (mult < 0)
+ mult = -mult;
+if (mult > num)
+ num = mult;
+
+mult = sp_globals.pspecs->yxmult >> 16;
+if (mult < 0)
+ mult = -mult;
+if (mult > num)
+ num = mult;
+
+mult = sp_globals.pspecs->yymult >> 16;
+if (mult < 0)
+ mult = -mult;
+if (mult > num)
+ num = mult;
+num++; /* Max absolute pixels per em (rounded up) */
+denom = (ufix32)sp_globals.orus_per_em;
+
+/* Set curve splitting depth adjustment to accomodate largest multiplier value */
+sp_globals.depth_adj = 0; /* 0 = 0.5 pel, 1 = 0.13 pel, 2 = 0.04 pel accuracy */
+denomcopy = denom;
+/* The following two occurances of a strange method of shifting twice by 1
+ are intentional and should not be changed to a single shift by 2.
+ It prevents MicroSoft C 5.1 from generating functions calls to do the shift.
+ Worse, using the REENTRANT_ALLOC option in conjunction with the /AC compiler
+ option, the function appears to be called incorrectly, causing depth_adj to always
+ be set to -7, causing very angular characters. */
+
+while ((num > denomcopy) && (sp_globals.depth_adj < 5)) /* > 1, 4, 16, ... pixels per oru? */
+ {
+ denomcopy <<= 1;
+ denomcopy <<= 1;
+ sp_globals.depth_adj++; /* Add 1, 2, 3, ... to depth adjustment */
+ }
+numcopy = num << 2;
+while ((numcopy <= denom) && (sp_globals.depth_adj > -4)) /* <= 1/4, 1/16, 1/64 pix per oru? */
+ {
+ numcopy <<= 1;
+ numcopy <<= 1;
+ sp_globals.depth_adj--; /* Subtract 1, 2, 3, ... from depth adjustment */
+ }
+SHOW(sp_globals.depth_adj);
+
+/* Set multiplier shift to accomodate largest multiplier value */
+sp_globals.multshift = 14;
+numcopy = num;
+while (numcopy >= denom) /* More than 1, 2, 4, ... pix per oru? */
+ {
+ numcopy >>= 1;
+ sp_globals.multshift--; /* sp_globals.multshift is 13, 12, 11, ... */
+ }
+
+sp_globals.multrnd = ((fix31)1 << sp_globals.multshift) >> 1;
+SHOW(sp_globals.multshift);
+
+
+pix_max = (ufix32)( 0xffff & read_word_u(sp_globals.hdr2_org + FH_PIXMX));
+
+num = 0;
+xmult = ((sp_globals.pspecs->xxmult >> 16) + 1) >> 1;
+ymult = ((sp_globals.pspecs->xymult >> 16) + 1) >> 1;
+offset = ((sp_globals.pspecs->xoffset >> 16) + 1) >> 1;
+for (i = 0; i < 8; i++)
+ {
+ if (i == 4)
+ {
+ xmult = ((sp_globals.pspecs->yxmult >> 16) + 1) >> 1;
+ ymult = ((sp_globals.pspecs->yymult >> 16) + 1) >> 1;
+ offset = ((sp_globals.pspecs->yoffset >> 16) + 1) >> 1;
+ }
+ x = (i & BIT1)? xmin: xmax;
+ y = (i & BIT0)? ymin: ymax;
+ pixval = (fix31)x * xmult + (fix31)y * ymult + offset * denom;
+ if (pixval < 0)
+ pixval = -pixval;
+ if (pixval > num)
+ {
+ num = pixval;
+ xx = x;
+ yy = y;
+ }
+ }
+if (xx < 0)
+ xx = -xx;
+if (yy < 0)
+ yy = -yy;
+num += xx + yy + ((pix_max + 2) * denom);
+ /* Allow (with 2:1 safety margin) for 1 pixel rounding errors in */
+ /* xmult, ymult and offset values, pix_max pixel expansion */
+ /* due to intelligent scaling, and */
+ /* 1 pixel rounding of overall character position */
+denom = denom << 14; /* Note num is in units of half pixels times orus per em */
+
+sp_globals.pixshift = -1;
+while ((num <= denom) && (sp_globals.pixshift < 8)) /* Max pixels <= 32768, 16384, 8192, ... pixels? */
+ {
+ num <<= 1;
+ sp_globals.pixshift++; /* sp_globals.pixshift = 0, 1, 2, ... */
+ }
+if (sp_globals.pixshift < 0)
+ return FALSE;
+
+SHOW(sp_globals.pixshift);
+sp_globals.poshift = 16 - sp_globals.pixshift;
+
+sp_globals.onepix = (fix15)1 << sp_globals.pixshift;
+sp_globals.pixrnd = sp_globals.onepix >> 1;
+sp_globals.pixfix = ~0 << sp_globals.pixshift;
+
+sp_globals.mpshift = sp_globals.multshift - sp_globals.pixshift;
+if (sp_globals.mpshift < 0)
+ return FALSE;
+sp_globals.mprnd = ((fix31)1 << sp_globals.mpshift) >> 1;
+
+return TRUE;
+}
+
+#ifdef old
+FUNCTION void sp_setup_tcb(ptcb)
+#else
+static FUNCTION void sp_setup_tcb(ptcb)
+#endif
+GDECL
+tcb_t GLOBALFAR *ptcb; /* Pointer to transformation control bloxk */
+/*
+ * Convert transformation coeffs to internal form
+ */
+{
+
+ptcb->xxmult = sp_setup_mult(sp_globals.pspecs->xxmult);
+ptcb->xymult = sp_setup_mult(sp_globals.pspecs->xymult);
+ptcb->xoffset = sp_setup_offset(sp_globals.pspecs->xoffset);
+ptcb->yxmult = sp_setup_mult(sp_globals.pspecs->yxmult);
+ptcb->yymult = sp_setup_mult(sp_globals.pspecs->yymult);
+ptcb->yoffset = sp_setup_offset(sp_globals.pspecs->yoffset);
+
+SHOW(ptcb->xxmult);
+SHOW(ptcb->xymult);
+SHOW(ptcb->xoffset);
+SHOW(ptcb->yxmult);
+SHOW(ptcb->yymult);
+SHOW(ptcb->yoffset);
+
+type_tcb(ptcb); /* Classify transformation type */
+}
+
+FUNCTION static fix15 sp_setup_mult(input_mult)
+GDECL
+fix31 input_mult; /* Multiplier in input format */
+/*
+ * Called by sp_setup_tcb() to convert multiplier in transformation
+ * matrix from external to internal form.
+ */
+{
+fix15 imshift; /* Right shift to internal format */
+fix31 imdenom; /* Divisor to internal format */
+fix31 imrnd; /* Rounding for division operation */
+
+imshift = 15 - sp_globals.multshift;
+imdenom = (fix31)sp_globals.orus_per_em << imshift;
+imrnd = imdenom >> 1;
+
+input_mult >>= 1;
+if (input_mult >= 0)
+ return (fix15)((input_mult + imrnd) / imdenom);
+else
+ return -(fix15)((-input_mult + imrnd) / imdenom);
+}
+
+FUNCTION static fix31 sp_setup_offset(input_offset)
+GDECL
+fix31 input_offset; /* Multiplier in input format */
+/*
+ * Called by sp_setup_tcb() to convert offset in transformation
+ * matrix from external to internal form.
+ */
+{
+fix15 imshift; /* Right shift to internal format */
+fix31 imrnd; /* Rounding for right shift operation */
+
+imshift = 15 - sp_globals.multshift;
+imrnd = ((fix31)1 << imshift) >> 1;
+
+return (((input_offset >> 1) + imrnd) >> imshift) + sp_globals.mprnd;
+}
+
+FUNCTION void type_tcb(ptcb)
+GDECL
+tcb_t GLOBALFAR *ptcb; /* Pointer to transformation control bloxk */
+{
+fix15 x_trans_type;
+fix15 y_trans_type;
+fix15 xx_mult;
+fix15 xy_mult;
+fix15 yx_mult;
+fix15 yy_mult;
+fix15 h_pos;
+fix15 v_pos;
+fix15 x_ppo;
+fix15 y_ppo;
+fix15 x_pos;
+fix15 y_pos;
+
+/* check for mirror image transformations */
+xx_mult = ptcb->xxmult;
+xy_mult = ptcb->xymult;
+yx_mult = ptcb->yxmult;
+yy_mult = ptcb->yymult;
+
+ptcb->mirror = ((((fix31)xx_mult*(fix31)yy_mult)-
+ ((fix31)xy_mult*(fix31)yx_mult)) < 0) ? -1 : 1;
+
+if (sp_globals.pspecs->flags & BOGUS_MODE) /* Linear transformation requested? */
+ {
+ ptcb->xtype = 4;
+ ptcb->ytype = 4;
+
+ ptcb->xppo = 0;
+ ptcb->yppo = 0;
+ ptcb->xpos = 0;
+ ptcb->ypos = 0;
+ }
+else /* Intelligent tranformation requested? */
+ {
+ h_pos = ((ptcb->xoffset >> sp_globals.mpshift) + sp_globals.pixrnd) & sp_globals.pixfix;
+ v_pos = ((ptcb->yoffset >> sp_globals.mpshift) + sp_globals.pixrnd) & sp_globals.pixfix;
+
+ x_trans_type = 4;
+ x_ppo = 0;
+ x_pos = 0;
+
+ y_trans_type = 4;
+ y_ppo = 0;
+ y_pos = 0;
+
+ if (xy_mult == 0)
+ {
+ if (xx_mult >= 0)
+ {
+ x_trans_type = 0; /* X pix is function of X orus only */
+ x_ppo = xx_mult;
+ x_pos = h_pos;
+ }
+ else
+ {
+ x_trans_type = 1; /* X pix is function of -X orus only */
+ x_ppo = -xx_mult;
+ x_pos = -h_pos;
+ }
+ }
+
+ else if (xx_mult == 0)
+ {
+ if (xy_mult >= 0)
+ {
+ x_trans_type = 2; /* X pix is function of Y orus only */
+ y_ppo = xy_mult;
+ y_pos = h_pos;
+ }
+ else
+ {
+ x_trans_type = 3; /* X pix is function of -Y orus only */
+ y_ppo = -xy_mult;
+ y_pos = -h_pos;
+ }
+ }
+
+ if (yx_mult == 0)
+ {
+ if (yy_mult >= 0)
+ {
+ y_trans_type = 0; /* Y pix is function of Y orus only */
+ y_ppo = yy_mult;
+ y_pos = v_pos;
+ }
+ else
+ {
+ y_trans_type = 1; /* Y pix is function of -Y orus only */
+ y_ppo = -yy_mult;
+ y_pos = -v_pos;
+ }
+ }
+ else if (yy_mult == 0)
+ {
+ if (yx_mult >= 0)
+ {
+ y_trans_type = 2; /* Y pix is function of X orus only */
+ x_ppo = yx_mult;
+ x_pos = v_pos;
+ }
+ else
+ {
+ y_trans_type = 3; /* Y pix is function of -X orus only */
+ x_ppo = -yx_mult;
+ x_pos = -v_pos;
+ }
+ }
+
+ ptcb->xtype = x_trans_type;
+ ptcb->ytype = y_trans_type;
+
+ ptcb->xppo = x_ppo;
+ ptcb->yppo = y_ppo;
+ ptcb->xpos = x_pos;
+ ptcb->ypos = y_pos;
+ }
+
+sp_globals.normal = (ptcb->xtype != 4) && (ptcb->ytype != 4);
+
+ptcb->xmode = 4;
+ptcb->ymode = 4;
+
+SHOW(ptcb->xtype);
+SHOW(ptcb->ytype);
+SHOW(ptcb->xppo);
+SHOW(ptcb->yppo);
+SHOW(ptcb->xpos);
+SHOW(ptcb->ypos);
+}
+
+FUNCTION fix31 read_long(pointer)
+GDECL
+ufix8 FONTFAR *pointer; /* Pointer to first byte of encrypted 3-byte integer */
+/*
+ * Reads a 3-byte encrypted integer from the byte string starting at
+ * the specified point.
+ * Returns the decrypted value read as a signed integer.
+ */
+{
+fix31 tmpfix31;
+
+tmpfix31 = (fix31)((*pointer++) ^ sp_globals.key4) << 8; /* Read middle byte */
+tmpfix31 += (fix31)(*pointer++) << 16; /* Read most significant byte */
+tmpfix31 += (fix31)((*pointer) ^ sp_globals.key6); /* Read least significant byte */
+return tmpfix31;
+}
+
+FUNCTION fix15 read_word_u(pointer)
+GDECL
+ufix8 FONTFAR *pointer; /* Pointer to first byte of unencrypted 2-byte integer */
+/*
+ * Reads a 2-byte unencrypted integer from the byte string starting at
+ * the specified point.
+ * Returns the decrypted value read as a signed integer.
+ */
+{
+fix15 tmpfix15;
+
+tmpfix15 = (fix15)(*pointer++) << 8; /* Read most significant byte */
+tmpfix15 += (fix15)(*pointer); /* Add least significant byte */
+return tmpfix15;
+}
+
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-26 13:03:36 +0000