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Add flags and ways to pass them around so that the character renderer can
take into account the joining behaviour of Arabic letters. This produces a few new glyphs that aren't incorporated into the OpenType tables yet.
This commit is contained in:
Ben Harris
parent
394a3a28d6
commit
a4b9779941
227
ttxt.c
227
ttxt.c
@ -1,4 +1,32 @@
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/*
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* Some of the character bitmaps below are likely to be subject to
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* copyright owned by Mullard's corporate successors, who are likely
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* to be NXP Semiconductors. Copyright in the Arabic glyphs is
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* probably owned by the European Broadcasting Union or one of its
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* members. Other than that, the file is covered by the following:
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*
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* Copyright (c) 2009 Ben Harris.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/*
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* This is a program to construct an outline font from a bitmap. It's
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* based on the character-rounding algorithm of the Mullard SAA5050
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@ -85,17 +113,8 @@ struct corner {
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int tl, tr, bl, br;
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};
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inline int
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getpix(char data[YSIZE], int x, int y) {
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if (x < 0 || x >= XSIZE || y < 0 || y >= YSIZE)
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return 0;
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else
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return (data[y] >> (XSIZE - x - 1)) & 1;
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}
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void doprologue(void);
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void dochar(char data[YSIZE]);
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void dochar(char data[YSIZE], unsigned flags);
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struct glyph {
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char data[YSIZE];
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@ -104,11 +123,14 @@ struct glyph {
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unsigned int flags;
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#define SC 0x01 /* Character has a small-caps variant. */
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/* Arabic classes */
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#define ARX 0x100 /* Arabic glyph joins to the right */
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#define ALX 0x200 /* Arabic glyph joins to the left */
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#define ADX 0x300 /* Arabic glyph joins on both sides */
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#define Amask 0xf0
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#define A1 0x10 /* Dual-joining Arabic character with upwards tail. */
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#define A2 0x20 /* Dual-joining Arabic character with downwards tail. */
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#define A3 0x30 /* Dual-joining Arabic character with loopy tail. */
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#define AFI 0x40 /* Dual-joining Arabic character with special X_n/X_r form. */
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#define A1 0x310 /* Dual-joining Arabic character with upwards tail. */
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#define A2 0x320 /* Dual-joining Arabic character with downwards tail. */
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#define A3 0x330 /* Dual-joining Arabic character with loopy tail. */
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#define AFI 0x340 /* Dual-joining Arabic character with special X_n/X_r form. */
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} glyphs[] = {
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/*
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* The first batch of glyphs comes from the code tables at the end of
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@ -368,39 +390,40 @@ struct glyph {
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* The second batch of glyphs was found in the appendices to
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* "Displayable Character Sets for Broadcast Teletext", EBU Tech
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* 3232-E, second edition, June 1982, as examples of rendering
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* characters in a 5x9 matrix. These versions have an extra pixel
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* added on the left side of many glyphs to connect to the next
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* letter.
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* characters in a 5x9 matrix.
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*/
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/* ASV-CODAR glyphs from Appendix 3 */
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{{001,001,001,001,001,001,000,000,000}, 0x0627 }, /* alef */
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{{000,000,000,001,001,077,000,004,000}, 0x0628, 0, A1 }, /* beh */
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{{000,000,000,001,001,037,000,004,000}, 0x0628, 0, A1 }, /* beh */
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{{000,012,000,001,001,077,000,000,000}, 0x062a }, /* teh */
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{{004,012,000,001,001,077,000,000,000}, 0x062b, 0, A1 }, /* theh */
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{{000,000,010,024,002,077,000,004,000}, 0x062c, 0, A2 }, /* jeem */
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{{000,000,010,024,002,077,000,000,000}, 0x062d, 0, A2 }, /* hah */
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{{004,000,010,024,002,077,000,000,000}, 0x062e, 0, A2 }, /* khah */
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{{004,012,000,001,001,037,000,000,000}, 0x062b, 0, A1 }, /* theh */
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{{000,000,010,024,002,037,000,004,000}, 0x062c, 0, A2 }, /* jeem */
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{{000,000,010,024,002,037,000,000,000}, 0x062d, 0, A2 }, /* hah */
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{{004,000,010,024,002,037,000,000,000}, 0x062e, 0, A2 }, /* khah */
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{{000,004,002,001,001,017,000,000,000}, 0x062f }, /* dal */
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{{001,004,002,001,001,017,000,000,000}, 0x0630 }, /* thal */
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{{000,000,000,001,001,001,002,004,010}, 0x0631 }, /* reh */
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{{000,004,000,001,001,001,002,004,010}, 0x0632 }, /* zain */
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{{000,000,000,025,025,077,000,000,000}, 0x0633, 0, A3 }, /* seen */
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{{004,012,000,025,025,077,000,000,000}, 0x0634, 0, A3 }, /* sheen */
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{{000,000,000,007,011,077,000,000,000}, 0x0635, 0, A3 }, /* sad */
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{{000,004,000,007,011,077,000,000,000}, 0x0636, 0, A3 }, /* dad */
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{{010,010,010,017,011,077,000,000,000}, 0x0637 }, /* tah */
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{{010,012,010,017,011,077,000,000,000}, 0x0638 }, /* zah */
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{{000,000,006,010,010,077,000,000,000}, 0x0639, 0, A2 }, /* ain */
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{{004,000,006,010,010,077,000,000,000}, 0x063a, 0, A2 }, /* ghain */
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{{002,000,002,005,003,077,000,000,000}, 0x0641, 0, A1 }, /* feh */
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{{012,000,002,005,003,077,000,000,000}, 0x0642, 0, A1 }, /* qaf */
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{{001,002,004,016,001,077,000,000,000}, 0x0643, 0, A1 }, /* kaf */
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{{001,001,001,001,001,077,000,000,000}, 0x0644, 0, A1 }, /* lam */
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{{000,000,000,000,006,071,006,000,000}, 0x0645, 0, A2 }, /* meem */
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{{000,004,000,001,001,077,000,000,000}, 0x0646, 0, A1 }, /* noon */
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{{000,006,001,015,013,077,000,000,000}, 0x0647, 0, AFI }, /* heh */
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{{000,000,000,025,025,037,000,000,000}, 0x0633, 0, A3 }, /* seen */
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{{004,012,000,025,025,037,000,000,000}, 0x0634, 0, A3 }, /* sheen */
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{{000,000,000,007,011,037,000,000,000}, 0x0635, 0, A3 }, /* sad */
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{{000,004,000,007,011,037,000,000,000}, 0x0636, 0, A3 }, /* dad */
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{{010,010,010,017,011,037,000,000,000}, 0x0637 }, /* tah */
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{{010,010,010,017,011,037,000,000,000}, 0xfec4, "uni0637.medi", ALX },
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{{010,012,010,017,011,037,000,000,000}, 0x0638 }, /* zah */
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{{010,012,010,017,011,037,000,000,000}, 0xfec8, "uni0638.medi", ALX },
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{{000,000,006,010,010,037,000,000,000}, 0x0639, 0, A2 }, /* ain */
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{{004,000,006,010,010,037,000,000,000}, 0x063a, 0, A2 }, /* ghain */
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{{002,000,002,005,003,037,000,000,000}, 0x0641, 0, A1 }, /* feh */
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{{012,000,002,005,003,037,000,000,000}, 0x0642, 0, A1 }, /* qaf */
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{{001,002,004,016,001,037,000,000,000}, 0x0643, 0, A1 }, /* kaf */
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{{001,001,001,001,001,037,000,000,000}, 0x0644, 0, A1 }, /* lam */
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{{000,000,000,000,006,031,006,000,000}, 0x0645, 0, A2 }, /* meem */
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{{000,000,000,000,006,031,006,000,000}, 0xfee4, "uni0645.medi", A2|ARX },
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{{000,004,000,001,001,037,000,000,000}, 0x0646, 0, A1 }, /* noon */
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{{000,006,001,015,013,037,000,000,000}, 0x0647, 0, AFI }, /* heh */
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{{000,000,000,003,005,007,001,001,016}, 0x0648 }, /* waw */
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{{000,000,000,001,001,077,000,012,000}, 0x064a, 0, AFI }, /* yeh */
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{{000,000,000,001,001,037,000,012,000}, 0x064a, 0, AFI }, /* yeh */
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{{000,000,006,010,010,006,010,000,000}, 0x0621 }, /* hamza */
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{{000,000,000,003,025,025,034,000,012}, 0xfef2, "uni064A.fina" }, /* yeh */
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{{000,000,000,003,025,025,034,000,000}, 0x0649 }, /* alef maksura */
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@ -410,36 +433,36 @@ struct glyph {
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{{015,011,015,001,001,001,000,000,000}, 0x0623 }, /* hamza on alef */
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{{001,001,001,001,015,011,014,000,000}, 0x0625 }, /* hamza under alef */
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{{017,010,001,001,001,001,001,000,000}, 0x0622 }, /* madda on alef */
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{{014,010,014,001,001,077,000,000,000}, -1, "asvcodar37", A1 },
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{{014,010,014,001,001,037,000,000,000}, -1, "asvcodar37", A1 },
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{{014,010,014,000,003,005,024,022,036}, 0x0626 }, /* hamza on yeh */
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{{030,020,030,003,005,007,001,001,016}, 0x0624 }, /* hamza on waw */
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{{007,000,000,000,000,000,000,000,000}, 0xfe76, "uni0020064E.isol" },
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{{007,000,000,000,000,077,000,000,000}, 0xfe77, "uni0640064E.medi" },
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{{007,000,000,000,000,037,000,000,000}, 0xfe77, "uni0640064E.medi", ADX },
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{{003,001,002,000,000,000,000,000,000}, 0xfe78, "uni0020064F.isol" },
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{{003,001,002,000,000,077,000,000,000}, 0xfe79, "uni0640064F.medi" },
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{{003,001,002,000,000,037,000,000,000}, 0xfe79, "uni0640064F.medi", ADX },
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{{000,000,000,000,000,000,000,000,007}, 0xfe7a, "uni00200650.isol" },
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{{000,000,000,000,000,077,000,000,007}, 0xfe7b, "uni06400650.medi" },
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{{000,000,000,000,000,037,000,000,007}, 0xfe7b, "uni06400650.medi", ADX },
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{{007,000,005,007,000,000,000,000,000}, -1, "asvcodar46" },
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{{003,001,002,000,005,007,000,000,000}, -1, "asvcodar47" },
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{{005,007,000,007,000,000,000,000,000}, -1, "asvcodar48" },
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{{005,007,000,007,000,077,000,000,000}, -1, "asvcodar49" },
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{{007,000,005,007,000,077,000,000,000}, -1, "asvcodar50" },
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{{005,007,000,000,000,077,000,000,000}, 0xfe7d, "uni06400651.medi" },
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{{005,007,000,007,000,037,000,000,000}, -1, "asvcodar49", ADX },
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{{007,000,005,007,000,037,000,000,000}, -1, "asvcodar50", ADX },
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{{005,007,000,000,000,037,000,000,000}, 0xfe7d, "uni06400651.medi", ADX },
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{{005,007,000,000,000,000,000,000,000}, 0xfe7c, "uni00200651.isol" },
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{{002,005,002,000,000,000,000,000,000}, 0xfe7e, "uni00200652.isol" },
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{{002,005,002,000,000,077,000,000,000}, 0xfe7f, "uni06400652.medi" },
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{{002,005,002,000,000,037,000,000,000}, 0xfe7f, "uni06400652.medi", ADX },
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{{016,016,000,000,000,000,000,000,000}, 0xfe70, "uni0020064B.isol" },
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{{033,011,022,000,000,000,000,000,000}, -1, "asvcodar56" },
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{{000,000,000,000,000,000,000,016,016}, 0xfe74, "uni0020064D.isol" },
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{{030,010,025,007,000,077,000,000,000}, -1, "asvcodar58" },
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{{030,010,025,007,000,037,000,000,000}, -1, "asvcodar58", ADX },
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{{007,007,005,007,000,000,000,000,000}, -1, "asvcodar59" },
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{{033,011,022,000,005,007,000,000,000}, -1, "asvcodar60" },
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{{012,016,000,016,016,000,000,000,000}, -1, "asvcodar61" },
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{{014,010,002,005,003,077,000,000,000}, 0x06a4, 0, A1 }, /* veh */
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{{000,000,000,001,001,077,000,012,004}, 0x067e, 0, A1 }, /* peh */
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{{005,012,024,016,001,077,000,000,000}, 0x06af, 0, A1 }, /* gaf */
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{{014,010,002,005,003,037,000,000,000}, 0x06a4, 0, A1 }, /* veh */
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{{000,000,000,001,001,037,000,012,004}, 0x067e, 0, A1 }, /* peh */
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{{005,012,024,016,001,037,000,000,000}, 0x06af, 0, A1 }, /* gaf */
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/* Arabic-Indic digits from Appendix 9 */
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{{000,000,000,004,000,000,000,000,000}, 0x0660 }, /* zero */
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@ -483,9 +506,9 @@ struct glyph {
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{{037,021,021,021,021,021,037,000,000}, -1, ".notdef" },
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/* Arabic tails */
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{{000,000,000,001,001,001,000,000,000}, -1, "tail1" },
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{{000,000,000,000,000,001,002,002,001}, -1, "tail2" },
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{{000,000,000,004,004,003,000,000,000}, -1, "tail3" },
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{{000,000,000,001,001,001,000,000,000}, -1, "tail1", ARX },
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{{000,000,000,000,000,001,002,002,001}, -1, "tail2", ARX },
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{{000,000,000,002,002,001,000,000,000}, -1, "tail3", ARX },
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/* This is getting silly. */
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{{000,000,016,021,037,021,021,000,000}, -1, "a.sc" },
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@ -516,6 +539,18 @@ struct glyph {
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{{000,000,037,002,004,010,037,000,000}, -1, "z.sc" },
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};
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inline int
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getpix(char data[YSIZE], int x, int y, unsigned flags) {
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if (y == 5 && ((x <= 0 && (flags & ALX)) ||
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(x >= XSIZE && (flags & ARX))))
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return 1;
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if (x < 0 || x >= XSIZE || y < 0 || y >= YSIZE)
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return 0;
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else
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return (data[y] >> (XSIZE - x - 1)) & 1;
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}
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int
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main(int argc, char **argv)
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{
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@ -530,11 +565,11 @@ main(int argc, char **argv)
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printf("FullName: TTXT\n");
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printf("FamilyName: TTXT\n");
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printf("Weight: Medium\n");
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printf("Copyright: Who knows?\n");
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printf("Copyright: Copyright 2009 Ben Harris and others\n");
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printf("Version: 000.001\n");
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printf("ItalicAngle: 0\n");
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printf("UnderlinePosition: -50\n");
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printf("UnderlineWidth: 50\n");
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printf("UnderlineWidth: 100\n");
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printf("Ascent: 700\n");
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printf("Descent: 300\n");
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printf("LayerCount: 2\n");
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@ -598,7 +633,7 @@ main(int argc, char **argv)
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(unsigned)glyphs[i].unicode);
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break;
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}
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dochar(glyphs[i].data);
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dochar(glyphs[i].data, glyphs[i].flags);
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printf("EndChar\n");
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}
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printf("EndChars\n");
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@ -858,55 +893,57 @@ whitepixel(int x, int y, int bl, int br, int tr, int tl)
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}
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void
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dochar(char data[YSIZE])
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dochar(char data[YSIZE], unsigned flags)
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{
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struct corner corner[XSIZE][YSIZE] = { };
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int x, y;
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#define GETPIX(x,y) (getpix(data, (x), (y), flags))
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clearpath();
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for (x = 0; x < XSIZE; x++) {
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for (y = 0; y < YSIZE; y++) {
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if (getpix(data, x, y)) {
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if (GETPIX(x, y)) {
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/* Assume filled in */
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corner[x][y].tl = 1;
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corner[x][y].tr = 1;
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corner[x][y].bl = 1;
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corner[x][y].br = 1;
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/* Check for diagonals */
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if ((getpix(data, x-1, y) == 0 &&
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getpix(data, x, y-1) == 0 &&
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getpix(data, x-1, y-1) == 1) ||
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(getpix(data, x+1, y) == 0 &&
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getpix(data, x, y+1) == 0 &&
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getpix(data, x+1, y+1) == 1)) {
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if ((GETPIX(x-1, y) == 0 &&
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GETPIX(x, y-1) == 0 &&
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GETPIX(x-1, y-1) == 1) ||
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(GETPIX(x+1, y) == 0 &&
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GETPIX(x, y+1) == 0 &&
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GETPIX(x+1, y+1) == 1)) {
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corner[x][y].tr = 0;
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corner[x][y].bl = 0;
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}
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if ((getpix(data, x+1, y) == 0 &&
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getpix(data, x, y-1) == 0 &&
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getpix(data, x+1, y-1) == 1) ||
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(getpix(data, x-1, y) == 0 &&
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getpix(data, x, y+1) == 0 &&
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getpix(data, x-1, y+1) == 1)) {
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if ((GETPIX(x+1, y) == 0 &&
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GETPIX(x, y-1) == 0 &&
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GETPIX(x+1, y-1) == 1) ||
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(GETPIX(x-1, y) == 0 &&
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GETPIX(x, y+1) == 0 &&
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GETPIX(x-1, y+1) == 1)) {
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corner[x][y].tl = 0;
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corner[x][y].br = 0;
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}
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/* Avoid odd gaps */
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if (getpix(data, x-1, y) == 1 ||
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getpix(data, x-1, y-1) == 1 ||
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getpix(data, x, y-1) == 1)
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if (GETPIX(x-1, y) == 1 ||
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GETPIX(x-1, y-1) == 1 ||
|
||||
GETPIX(x, y-1) == 1)
|
||||
corner[x][y].tl = 1;
|
||||
if (getpix(data, x+1, y) == 1 ||
|
||||
getpix(data, x+1, y-1) == 1 ||
|
||||
getpix(data, x, y-1) == 1)
|
||||
if (GETPIX(x+1, y) == 1 ||
|
||||
GETPIX(x+1, y-1) == 1 ||
|
||||
GETPIX(x, y-1) == 1)
|
||||
corner[x][y].tr = 1;
|
||||
if (getpix(data, x-1, y) == 1 ||
|
||||
getpix(data, x-1, y+1) == 1 ||
|
||||
getpix(data, x, y+1) == 1)
|
||||
if (GETPIX(x-1, y) == 1 ||
|
||||
GETPIX(x-1, y+1) == 1 ||
|
||||
GETPIX(x, y+1) == 1)
|
||||
corner[x][y].bl = 1;
|
||||
if (getpix(data, x+1, y) == 1 ||
|
||||
getpix(data, x+1, y+1) == 1 ||
|
||||
getpix(data, x, y+1) == 1)
|
||||
if (GETPIX(x+1, y) == 1 ||
|
||||
GETPIX(x+1, y+1) == 1 ||
|
||||
GETPIX(x, y+1) == 1)
|
||||
corner[x][y].br = 1;
|
||||
blackpixel(x, YSIZE - y - 1,
|
||||
corner[x][y].bl, corner[x][y].br,
|
||||
@ -918,21 +955,21 @@ dochar(char data[YSIZE])
|
||||
corner[x][y].bl = 0;
|
||||
corner[x][y].br = 0;
|
||||
/* white pixel -- just diagonals */
|
||||
if (getpix(data, x-1, y) == 1 &&
|
||||
getpix(data, x, y-1) == 1 &&
|
||||
getpix(data, x-1, y-1) == 0)
|
||||
if (GETPIX(x-1, y) == 1 &&
|
||||
GETPIX(x, y-1) == 1 &&
|
||||
GETPIX(x-1, y-1) == 0)
|
||||
corner[x][y].tl = 1;
|
||||
if (getpix(data, x+1, y) == 1 &&
|
||||
getpix(data, x, y-1) == 1 &&
|
||||
getpix(data, x+1, y-1) == 0)
|
||||
if (GETPIX(x+1, y) == 1 &&
|
||||
GETPIX(x, y-1) == 1 &&
|
||||
GETPIX(x+1, y-1) == 0)
|
||||
corner[x][y].tr = 1;
|
||||
if (getpix(data, x-1, y) == 1 &&
|
||||
getpix(data, x, y+1) == 1 &&
|
||||
getpix(data, x-1, y+1) == 0)
|
||||
if (GETPIX(x-1, y) == 1 &&
|
||||
GETPIX(x, y+1) == 1 &&
|
||||
GETPIX(x-1, y+1) == 0)
|
||||
corner[x][y].bl = 1;
|
||||
if (getpix(data, x+1, y) == 1 &&
|
||||
getpix(data, x, y+1) == 1 &&
|
||||
getpix(data, x+1, y+1) == 0)
|
||||
if (GETPIX(x+1, y) == 1 &&
|
||||
GETPIX(x, y+1) == 1 &&
|
||||
GETPIX(x+1, y+1) == 0)
|
||||
corner[x][y].br = 1;
|
||||
whitepixel(x, YSIZE - y - 1,
|
||||
corner[x][y].bl, corner[x][y].br,
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user