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Diffstat (limited to 'systems/msdos/dviware/xdvi-dos/src/pxl.c')
-rw-r--r--systems/msdos/dviware/xdvi-dos/src/pxl.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/systems/msdos/dviware/xdvi-dos/src/pxl.c b/systems/msdos/dviware/xdvi-dos/src/pxl.c
new file mode 100644
index 0000000000..1841aa614a
--- /dev/null
+++ b/systems/msdos/dviware/xdvi-dos/src/pxl.c
@@ -0,0 +1,166 @@
+/***
+ *** PXL font reading routines.
+ *** Public routines are read_PXL_index and read_PXL_char.
+ ***/
+
+#ifndef MSBITFIRST
+static unsigned char _reverse_byte[0x100] = {
+ 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
+ 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
+ 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
+ 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
+ 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
+ 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
+ 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
+ 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
+ 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
+ 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
+ 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
+ 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
+ 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
+ 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
+ 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
+ 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
+ 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
+ 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
+ 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
+ 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
+ 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
+ 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
+ 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
+ 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
+ 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
+ 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
+ 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
+ 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
+ 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
+ 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
+ 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
+ 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
+};
+#endif /* MSBITFIRST */
+
+static void
+read_PXL_char(fontp, ch)
+ register struct font *fontp;
+ ubyte ch;
+{
+ register struct bitmap *bitmap;
+ register BMUNIT *ptr;
+ register FILE *fp = fontp->file;
+ register int i, j;
+#ifndef BMLONG
+ register int padding_length;
+#endif
+
+ bitmap = &fontp->glyph[ch].bitmap;
+ /* in file, bitmap rows are multiples of 32 bits wide */
+ alloc_bitmap(bitmap);
+ ptr = (BMUNIT *) bitmap->bits;
+#ifndef BMLONG
+ padding_length = 3 - (bitmap->bytes_wide + 3) % 4;
+#endif
+ for (i = bitmap->h; i > 0; --i) {
+ for (j = bitmap->bytes_wide; j > 0; j -= BYTES_PER_BMUNIT) {
+#ifndef MSBITFIRST
+ *ptr = _reverse_byte[one(fp)];
+#if BYTES_PER_BMUNIT > 1
+ *ptr |= (BMUNIT) _reverse_byte[one(fp)] << 8;
+#endif
+#ifdef BMLONG
+ *ptr |= (BMUNIT) _reverse_byte[one(fp)] << 16;
+ *ptr |= (BMUNIT) _reverse_byte[one(fp)] << 24;
+#endif
+#else /* MSBITFIRST */
+ *ptr = 0;
+#ifdef BMLONG
+ *ptr |= (BMUNIT) one(fp) << 24;
+ *ptr |= (BMUNIT) one(fp) << 16;
+#endif
+#if BYTES_PER_BMUNIT > 1
+ *ptr |= (BMUNIT) one(fp) << 8;
+#endif
+ *ptr |= (BMUNIT) one(fp);
+#endif /* MSBITFIRST */
+ ++ptr;
+ }
+#ifndef BMLONG
+ for (j = padding_length; j > 0; --j) (void) one(fp);
+#endif
+ }
+}
+
+void
+read_PXL_index(fontp)
+ register struct font *fontp;
+{
+ register FILE *fp = fontp->file;
+ register struct glyph *g;
+ long font_dir_ptr;
+ long trailer_ptr;
+
+ if (debug & DBG_PK)
+ Printf("Reading PXL file %s\n", fontp->filename);
+ fontp->read_char = read_PXL_char;
+ /* seek to trailer info */
+ Fseek(fp, (long) -4, 2);
+ while (four(fp) != 1001)
+ Fseek(fp, (long) -5, 1);
+ Fseek(fp, (long) -5 * 4, 1);
+ trailer_ptr = ftell(fp);
+ (void) four(fp); /* checksum */
+ (void) four(fp); /* magnify */
+ (void) four(fp); /* design size */
+ font_dir_ptr = sfour(fp) * 4;
+ (void) four(fp); /* pxl id word */
+ /* seek to font directory */
+ Fseek(fp, font_dir_ptr, 0);
+ maxchar = (trailer_ptr - font_dir_ptr) / 16 - 1;
+ fontp->glyph = (struct glyph *)
+ xmalloc((maxchar + 1) * sizeof(struct glyph), "glyph array");
+ for (g = fontp->glyph; g <= fontp->glyph + maxchar; ++g) {
+ g->bitmap.bits = NULL;
+ g->bitmap2.bits = NULL;
+#ifdef GREY
+ g->pixmap2 = NULL;
+#endif
+ g->bitmap.w = two(fp);
+ g->bitmap.h = two(fp);
+ g->x = stwo(fp);
+ g->y = stwo(fp);
+ g->addr = four(fp) * 4;
+ /*
+ ** The TFM-width word is kind of funny in the units
+ ** it is expressed in. It works this way:
+ **
+ ** If a glyph has width 'w' in a font with design-size
+ ** 'd' (both in same units), the TFM-width word is
+ **
+ ** t = (w/d) * 2^20
+ **
+ ** Therefore, in order to find the glyph width in
+ ** DVI units (1 / 2^16 points), we take the design-size
+ ** 'd' (in DVI's), the magnification 'm' of the PXL file
+ ** and the TFM-width word 't' to the width (in DVI's)
+ ** as follows:
+ **
+ ** dmt
+ ** w = -----
+ ** 2^20
+ **
+ ** But the magnification of the PXL file is just the
+ ** scaled size 's' over the design size, so the final
+ ** expression for the width is
+ **
+ ** st
+ ** w = ----
+ ** 2^20
+ **
+ */
+
+ g->dvi_adv = fontp->dimconv * four(fp);
+ if (debug & DBG_PK)
+ Printf("size=%dx%d, dvi_adv=%d\n", g->bitmap.w, g->bitmap.h,
+ g->dvi_adv);
+ }
+}