diff options
Diffstat (limited to 'lib/libpbmfont2.c')
| -rw-r--r-- | lib/libpbmfont2.c | 538 |
1 files changed, 417 insertions, 121 deletions
diff --git a/lib/libpbmfont2.c b/lib/libpbmfont2.c index b354e91b..7c0415c1 100644 --- a/lib/libpbmfont2.c +++ b/lib/libpbmfont2.c @@ -33,6 +33,211 @@ #include "pbm.h" /*---------------------------------------------------------------------------- + Font selector routines + + The selector is a device consisting of a bitmap, min value, max value and + count. It is used here to specify necessary fonts and record what entries + are valid in the glyph array. + + This device may be used for other purposes. In that case the code should + be put into an independent source file in the lib/util subdirectory. +-----------------------------------------------------------------------------*/ + +static void +allocRecord(struct pm_selector * const selectorP, + unsigned int const max) { + + unsigned int const size = (max + 8) / 8; + + MALLOCARRAY(selectorP->localRecord, size); + + if (!selectorP->localRecord) + pm_error("Failed to allocate %u bytes of memory for font selector " + "bitmap", size); + + selectorP->record = selectorP->localRecord; +} + + + +void +pm_selector_create(unsigned int const max, + struct pm_selector ** const selectorPP) { + + struct pm_selector * selectorP; + + MALLOCVAR_NOFAIL(selectorP); + + allocRecord(selectorP, max); + + { + unsigned int byteIndex; + for (byteIndex = 0; byteIndex <= max/8; ++byteIndex) + selectorP->localRecord[byteIndex]= 0x00; + } + + selectorP->maxmax = selectorP->min = max; + selectorP->max = 0; + selectorP->count = 0; + + *selectorPP = selectorP; +} + + + +void +pm_selector_create_fixed(const unsigned char * const record, + unsigned int const min, + unsigned int const max, + unsigned int const count, + struct pm_selector ** const selectorPP) { + + struct pm_selector * selectorP; + + MALLOCVAR_NOFAIL(selectorP); + + selectorP->localRecord = NULL; + selectorP->record = record; + selectorP->min = min; + selectorP->max = max; + selectorP->maxmax = max; + selectorP->count = count; + + *selectorPP = selectorP; +} + + + +void +pm_selector_destroy(struct pm_selector * const selectorP) { + + if (selectorP->localRecord) + free(selectorP->localRecord); + + free(selectorP); +} + + + +void +pm_selector_copy(unsigned int const max, + const struct pm_selector * const srcSelectorP, + struct pm_selector ** const destSelectorPP) { + + /* Create a new selector and copy into it the content of another */ + + struct pm_selector * destSelectorP; + + if (max < srcSelectorP->max) + pm_error("internal error: attempt to copy a selector as " + "another with a smaller max value %u -> %u", + srcSelectorP->max, max); + + MALLOCVAR_NOFAIL(destSelectorP); + + destSelectorP->maxmax = max; + destSelectorP->max = srcSelectorP->max; + destSelectorP->min = srcSelectorP->min; + destSelectorP->count = srcSelectorP->count; + + allocRecord(destSelectorP, max); + + { + unsigned int const minByteIndex = srcSelectorP->min / 8; + unsigned int const maxByteIndex = srcSelectorP->max / 8; + unsigned int const maxmaxByteIndex = max / 8; + + unsigned int byteIndex; + + for (byteIndex = 0 ; byteIndex < minByteIndex; ++byteIndex) + destSelectorP->localRecord[byteIndex] = 0x00; + for (byteIndex = maxByteIndex + 1 ; byteIndex <= maxmaxByteIndex; + ++byteIndex) + destSelectorP->localRecord[byteIndex] = 0x00; + for (byteIndex = minByteIndex; byteIndex <= maxByteIndex; ++byteIndex) + destSelectorP->localRecord[byteIndex] = + srcSelectorP->record[byteIndex]; + } + + *destSelectorPP = destSelectorP; +} + + + +void +pm_selector_mark(struct pm_selector * const selectorP, + unsigned int const index) { +/*---------------------------------------------------------------------------- + Mark index 'index'. +-----------------------------------------------------------------------------*/ + unsigned int byteIndex = index / 8; + unsigned int bitIndex = index % 8; + unsigned char mask = (0x01 <<7) >> bitIndex; + + /* set bit on to indicate presence of this index */ + + if (!selectorP->localRecord) + pm_error("INTERNAL ERROR: attempt to mark in a fixed pm_selector"); + + if ((selectorP->localRecord[byteIndex] & mask) == 0x00) { + /* if bit is not already set */ + + selectorP->localRecord[byteIndex] |= mask; + ++selectorP->count; /* increment count */ + + /* reset min and max */ + if (selectorP->min > index) + selectorP->min = index; + if (selectorP->max < index) + selectorP->max = index; + } +} + + + +/* There is no function for erasing a marked bit */ + + + +int /* boolean */ +pm_selector_is_marked(const struct pm_selector * const selectorP, + unsigned int const index) { +/*---------------------------------------------------------------------------- + Index 'index' is marked. +-----------------------------------------------------------------------------*/ + bool retval; + + if (selectorP) { + unsigned int const byteIndex = index / 8; + unsigned int const bitIndex = index % 8; + unsigned char const mask = (0x01 <<7) >> bitIndex; + + if ( index < selectorP->min || index > selectorP->max) + retval = false; + else if ((selectorP->record[byteIndex] & mask) != 0x00) + retval = true; + else + retval = false; + } else { + /* All entries are set to "exist" */ + retval = true; + } + return retval ? 1 : 0; +} + + + +unsigned int +pm_selector_marked_ct(const struct pm_selector * const selectorP) { +/*---------------------------------------------------------------------------- + Number of indices that are marked. +-----------------------------------------------------------------------------*/ + return selectorP->count; +} + + + +/*---------------------------------------------------------------------------- Routines for loading a BDF font file -----------------------------------------------------------------------------*/ @@ -110,14 +315,13 @@ tokenize(char * const s, while (*p) { if (!ISGRAPH(*p)) { - if(!ISSPACE(*p)) { - /* Control chars excluding 09 - 0d (space), 80-ff */ - pm_message("Warning: non-ASCII character '%x' in " - "BDF font file", *p); + if (!ISSPACE(*p)) { + /* Control chars excluding 09 - 0d (space), 80-ff */ + pm_message("Warning: non-ASCII character '%x' in " + "BDF font file", *p); } *p++ = '\0'; - } - else { + } else { words[n++] = p; if (n >= wordsSz - 1) break; @@ -193,6 +397,7 @@ parseBitmapRow(const char * const hex, glyphWidth, hex); else { char const hdig = *p++; + unsigned int hdigValue; if (hdig >= '0' && hdig <= '9') @@ -315,7 +520,7 @@ static void validateWordCount(Readline * const readlineP, unsigned int const nWords) { - if( readlineP->wordCt != nWords ) + if (readlineP->wordCt != nWords) pm_error("Wrong number of arguments in '%s' line in BDF font file", readlineP->arg[0]); @@ -334,7 +539,6 @@ readExpectedStatement(Readline * const readlineP, beginning of the line is that, e.g. "STARTFONT"). Check for the number of words: 'nWords'. If either condition is not met, fail the program. -----------------------------------------------------------------------------*/ - bool eof; readline_read(readlineP, &eof); @@ -354,21 +558,22 @@ readExpectedStatement(Readline * const readlineP, static void skipCharacter(Readline * const readlineP) { /*---------------------------------------------------------------------------- - In the BDF font file being read by readline object *readlineP, skip through - the end of the character we are presently in. + In the BDF font file being read by readline object *readlineP, skip + through to the end of the data for the character we are presently in. + + At entry the stream must be positioned at the end of the ENCODING line. -----------------------------------------------------------------------------*/ - bool endChar; + char * rc; + do { + rc = fgets(readlineP->line, MAXBDFLINE+1, readlineP->ifP); + readlineP->line[7] = '\0'; - endChar = FALSE; + } while (rc != NULL && !streq(readlineP->line, "ENDCHAR")); + + if (rc == NULL) + pm_error("End of file in the middle of a character (before " + "ENDCHAR) in BDF font file."); - while (!endChar) { - bool eof; - readline_read(readlineP, &eof); - if (eof) - pm_error("End of file in the middle of a character (before " - "ENDCHAR) in BDF font file."); - endChar = streq(readlineP->arg[0], "ENDCHAR"); - } } @@ -425,16 +630,21 @@ interpEncoding(const char ** const arg, bool badCodepoint; unsigned int codepoint; + gotCodepoint = false; /* initial value */ + if (wordToInt(arg[1]) >= 0) { codepoint = wordToInt(arg[1]); gotCodepoint = true; } else { - if (wordToInt(arg[1]) == -1 && arg[2] != NULL) { - codepoint = wordToInt(arg[2]); - gotCodepoint = true; - } else - gotCodepoint = false; + if (wordToInt(arg[1]) == -1 && arg[2] != NULL) { + int const codepoint0 = wordToInt(arg[2]); + if (codepoint0 >= 0) { + codepoint = codepoint0; + gotCodepoint = true; + } + } } + if (gotCodepoint) { if (codepoint > maxmaxglyph) badCodepoint = true; @@ -455,8 +665,9 @@ readEncoding(Readline * const readlineP, bool * const badCodepointP, PM_WCHAR const maxmaxglyph) { + const char * const expected = "ENCODING"; + bool eof; - const char * expected = "ENCODING"; readline_read(readlineP, &eof); @@ -465,7 +676,7 @@ readEncoding(Readline * const readlineP, else if (!streq(readlineP->arg[0], expected)) pm_error("Statement of type '%s' where '%s' expected in BDF font file", readlineP->arg[0], expected); - else if(readlineP->wordCt != 2 && readlineP->wordCt != 3) + else if (readlineP->wordCt != 2 && readlineP->wordCt != 3) pm_error("Wrong number of arguments in '%s' line in BDF font file", readlineP->arg[0]); @@ -538,112 +749,148 @@ validateGlyphLimits(const struct font2 * const font2P, static void -processChars(Readline * const readlineP, - struct font2 * const font2P) { -/*---------------------------------------------------------------------------- - Process the CHARS block in a BDF font file, assuming the file is positioned - just after the CHARS line. Read the rest of the block and apply its - contents to *font2P. ------------------------------------------------------------------------------*/ - unsigned int const nCharacters = wordToInt(readlineP->arg[1]); - - unsigned int nCharsDone; - unsigned int nCharsValid; - - for (nCharsDone = 0, nCharsValid = 0; - nCharsDone < nCharacters; ) { +readStartchar(Readline * const readlineP, + const char ** charNameP) { + const char * charName; bool eof; readline_read(readlineP, &eof); if (eof) pm_error("End of file after CHARS reading BDF font file"); - if (streq(readlineP->arg[0], "COMMENT")) { + while (streq(readlineP->arg[0], "COMMENT")) { + readline_read(readlineP, &eof); + if (eof) + pm_error("End of file after CHARS reading BDF font file"); /* ignore */ - } else if (!streq(readlineP->arg[0], "STARTCHAR")) + } + + if (!streq(readlineP->arg[0], "STARTCHAR")) pm_error("%s detected where \'STARTCHAR\' expected " "in BDF font file", readlineP->arg[0] ); - else { - const char * charName; - - struct glyph * glyphP; - unsigned int codepoint; - bool badCodepoint; - - if (readlineP->wordCt < 2) - pm_error("Wrong number of arguments in STARTCHAR line " - "in BDF font file"); + else if (readlineP->wordCt < 2) + pm_error("Wrong number of arguments in STARTCHAR line " + "in BDF font file"); /* Character name may contain spaces: there may be more than three words in the line. */ + else charName = pm_strdup(readlineP->arg[1]); - assert(streq(readlineP->arg[0], "STARTCHAR")); + *charNameP = charName; +} - MALLOCVAR(glyphP); - if (glyphP == NULL) - pm_error("no memory for font glyph for '%s' character", - charName); - readEncoding(readlineP, &codepoint, &badCodepoint, - font2P->maxmaxglyph); +static void +readGlyph(Readline * const readlineP, + const char * const charName, + const struct font2 * const font2P, + struct glyph ** const glyphPP) { + + struct glyph * glyphP; + + MALLOCVAR(glyphP); + if (glyphP == NULL) + pm_error("no memory for font glyph for '%s' character", + charName); - if (badCodepoint) - skipCharacter(readlineP); - else { - if (codepoint < font2P->maxglyph) { - if (font2P->glyph[codepoint] != NULL) - pm_error("Multiple definition of code point %u " - "in BDF font file", (unsigned int) codepoint); - else - pm_message("Reverse order detected in BDF file. " - "Code point %u defined after %u", - (unsigned int) codepoint, - (unsigned int) font2P->maxglyph); - } else { - /* Initialize all characters in the gap to nonexistent */ - unsigned int i; - unsigned int const oldMaxglyph = font2P->maxglyph; - unsigned int const newMaxglyph = codepoint; + readExpectedStatement(readlineP, "SWIDTH", 3); + + readExpectedStatement(readlineP, "DWIDTH", 3); + glyphP->xadd = wordToInt(readlineP->arg[1]); + + readExpectedStatement(readlineP, "BBX", 5); + glyphP->width = wordToInt(readlineP->arg[1]); + glyphP->height = wordToInt(readlineP->arg[2]); + glyphP->x = wordToInt(readlineP->arg[3]); + glyphP->y = wordToInt(readlineP->arg[4]); + + validateGlyphLimits(font2P, glyphP, charName); + + createBmap(glyphP->width, glyphP->height, readlineP, charName, + &glyphP->bmap); + + *glyphPP = glyphP; +} + + + +static void +processChars(Readline * const readlineP, + struct font2 * const font2P) { +/*---------------------------------------------------------------------------- + Process the CHARS block in a BDF font file, assuming the file is positioned + just after the CHARS line. Read the rest of the block and apply its + contents to *font2P. +-----------------------------------------------------------------------------*/ + unsigned int const nCharacters = wordToInt(readlineP->arg[1]); + unsigned int const nCharsWanted = (font2P->selectorP != NULL) ? + font2P->selectorP->count : nCharacters; - for (i = oldMaxglyph + 1; i < newMaxglyph; ++i) - font2P->glyph[i] = NULL; + unsigned int nCharsEncountered; + unsigned int nCharsLoaded; - font2P->maxglyph = newMaxglyph; - } + for (nCharsEncountered = 0, nCharsLoaded = 0; + nCharsEncountered < nCharacters && nCharsLoaded < nCharsWanted; + ++nCharsEncountered ) { - readExpectedStatement(readlineP, "SWIDTH", 3); + const char * charName; + unsigned int codepoint; + bool badCodepoint; - readExpectedStatement(readlineP, "DWIDTH", 3); - glyphP->xadd = wordToInt(readlineP->arg[1]); + readStartchar(readlineP, &charName); - readExpectedStatement(readlineP, "BBX", 5); - glyphP->width = wordToInt(readlineP->arg[1]); - glyphP->height = wordToInt(readlineP->arg[2]); - glyphP->x = wordToInt(readlineP->arg[3]); - glyphP->y = wordToInt(readlineP->arg[4]); + readEncoding(readlineP, &codepoint, &badCodepoint, + font2P->maxmaxglyph); - validateGlyphLimits(font2P, glyphP, charName); + if ( badCodepoint ) { + skipCharacter(readlineP); + pm_strfree (charName); + } + else if (!pm_selector_is_marked(font2P->selectorP, codepoint) ) { + skipCharacter(readlineP); + pm_strfree (charName); + font2P->maxglyph = codepoint; + } + else { + if (codepoint < font2P->maxglyph) { + if (font2P->glyph[codepoint] != NULL ) + pm_error("Multiple definition of code point %u " + "in BDF font file", (unsigned int) codepoint); + else + pm_message("Reverse order detected in BDF file. " + "Code point %u defined after %u", + (unsigned int) codepoint, + (unsigned int) font2P->maxglyph); + } - createBmap(glyphP->width, glyphP->height, readlineP, charName, - &glyphP->bmap); + { + struct glyph * glyphP; - readExpectedStatement(readlineP, "ENDCHAR", 1); + readGlyph(readlineP, charName, font2P, &glyphP); + readExpectedStatement(readlineP, "ENDCHAR", 1); - assert(codepoint <= font2P->maxmaxglyph); - /* Ensured by readEncoding() */ + assert(codepoint <= font2P->maxmaxglyph); + /* Ensured by readEncoding() */ - font2P->glyph[codepoint] = glyphP; - pm_strfree(charName); + font2P->glyph[codepoint] = glyphP; + pm_strfree(charName); - ++nCharsValid; + font2P->maxglyph = codepoint; + ++nCharsLoaded; } - ++nCharsDone; } } - font2P->chars = nCharsValid; + + /* Note that BDF file may have reached end before the largest entry + in selector was checked. */ + /* + if (font2P->selectorP->max > font2P->maxglyph) + font2P->maxglyph = font2P->selectorP->max; + */ + font2P->chars = nCharsLoaded; font2P->total_chars = nCharacters; } @@ -718,7 +965,6 @@ loadCharsetString(const char * const registry, - static unsigned int const maxTokenLen = 60; @@ -904,6 +1150,9 @@ processBdfFontLine(Readline * const readlineP, else { validateWordCount(readlineP, 2); /* CHARS n */ processChars(readlineP, font2P); + if (font2P->selectorP != NULL && + font2P->selectorP->count == font2P->chars) + *endOfFontP = true; } } else { /* ignore */ @@ -913,9 +1162,38 @@ processBdfFontLine(Readline * const readlineP, +static void +initializeGlyphArray(struct font2 * const font2P, + unsigned int const maxmaxglyph) { +/*---------------------------------------------------------------------------- + Initialize glyph array based on entries in selector. + Note that only valid codepoints are set to NULL. + Entries for unused glyphs are left untouched. +-----------------------------------------------------------------------------*/ + const struct pm_selector * const selectorP = font2P->selectorP; + unsigned int const min = (selectorP == NULL) ? 0 : selectorP->min; + unsigned int const max = + (selectorP == NULL) ? font2P->maxglyph : selectorP->max; + + unsigned int codepoint; + + for (codepoint = min; codepoint <= max ; ++codepoint) + if (pm_selector_is_marked(selectorP, codepoint) == true) + font2P->glyph[codepoint] = NULL; + + font2P->glyph[L' '] = NULL; + /* Clear the slot for space character. + It may not be defined in the font, but the program may try + to use space as a substitute char + */ +} + + + struct font2 * -pbm_loadbdffont2(const char * const filename, - PM_WCHAR const maxmaxglyph) { +pbm_loadbdffont2select(const char * const filename, + PM_WCHAR const maxmaxglyph, + const struct pm_selector * const selectorP) { /*---------------------------------------------------------------------------- Read a BDF font file "filename" as a 'font2' structure. A 'font2' structure is more expressive than a 'font' structure, most notably in that @@ -925,8 +1203,10 @@ pbm_loadbdffont2(const char * const filename, The returned object is in new malloc'ed storage, in many pieces. When done with, destroy with pbm_destroybdffont2(). ------------------------------------------------------------------------------*/ + The returned object refers to *selectorP, so that must continue to exist + until you call pbm_destroybdffont2(). +-----------------------------------------------------------------------------*/ FILE * ifP; Readline readline; struct font2 * font2P; @@ -943,8 +1223,14 @@ pbm_loadbdffont2(const char * const filename, font2P->maxglyph = 0; /* Initial value. Increases as new characters are loaded */ - font2P->glyph[0] = NULL; - /* Initial value. Overwrite later if codepoint 0 is defined. */ + + if (font2P->selectorP == NULL) { + PM_WCHAR i; + + for (i = 0; i <= maxmaxglyph; ++i) + font2P->glyph[i] = NULL; + /* Initial value. Overwrite later if codepoint i is defined. */ + } font2P->maxmaxglyph = maxmaxglyph; @@ -955,6 +1241,9 @@ pbm_loadbdffont2(const char * const filename, font2P->chars = font2P->total_chars = 0; font2P->default_char = 0; font2P->default_char_defined = FALSE; + font2P->selectorP = (struct pm_selector * const) selectorP; + + initializeGlyphArray(font2P, maxmaxglyph); readExpectedStatement(&readline, "STARTFONT", 2); @@ -970,9 +1259,13 @@ pbm_loadbdffont2(const char * const filename, } fclose(ifP); - if(font2P->chars == 0) + if (font2P->total_chars == 0) pm_error("No glyphs found in BDF font file " "in codepoint range 0 - %u", (unsigned int) maxmaxglyph); + if (font2P->chars == 0) + pm_error("Not any requested glyphs found in BDF font file " + "in codepoint range 0 - %u", (unsigned int) maxmaxglyph); + REALLOCARRAY(font2P->glyph, font2P->maxglyph + 1); @@ -986,10 +1279,21 @@ pbm_loadbdffont2(const char * const filename, } + +struct font2 * +pbm_loadbdffont2(const char * const filename, + PM_WCHAR const maxmaxglyph) { + + return pbm_loadbdffont2select(filename, maxmaxglyph, NULL); +} + + + static struct font * font2ToFont(const struct font2 * const font2P) { - struct font * fontP; - unsigned int codePoint; + + struct font * fontP; + unsigned int codePoint; MALLOCVAR(fontP); if (fontP == NULL) @@ -1001,18 +1305,10 @@ font2ToFont(const struct font2 * const font2P) { fontP->x = font2P->x; fontP->y = font2P->y; - for (codePoint = 0; codePoint <= font2P->maxglyph; ++codePoint) - fontP->glyph[codePoint] = font2P->glyph[codePoint]; - - /* font2P->maxglyph is typically 255 (PM_FONT_MAXGLYPH) or larger. - But in some rare cases it is smaller. - If an ASCII-only font is read, it will be 126 or 127. - - Set remaining codepoints up to PM_FONT_MAXGLYPH, if any, to NULL - */ - - for ( ; codePoint <= PM_FONT_MAXGLYPH; ++codePoint) - fontP->glyph[codePoint] = NULL; + for (codePoint = 0; codePoint <= PM_FONT_MAXGLYPH; ++codePoint) + fontP->glyph[codePoint] = + pm_selector_is_marked(font2P->selectorP, codePoint) ? + font2P->glyph[codePoint] : NULL; /* Give values to legacy fields */ fontP->oldfont = font2P->oldfont; |