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+//========================================================================
+//
+// HTMLGen.cc
+//
+// Copyright 2010-2021 Glyph & Cog, LLC
+//
+//========================================================================
+
+//~ to do:
+//~ - fonts
+//~ - underlined? (underlines are present in the background image)
+//~ - include the original font name in the CSS entry (before the
+//~ generic serif/sans-serif/monospace name)
+//~ - check that htmlDir exists and is a directory
+//~ - links:
+//~ - internal links (to pages, to named destinations)
+//~ - links from non-text content
+//~ - rotated text should go in the background image
+//~ - metadata
+//~ - PDF outline
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma implementation
+#endif
+
+#include <stdlib.h>
+#include <png.h>
+#include "gmem.h"
+#include "gmempp.h"
+#include "GString.h"
+#include "GList.h"
+#include "SplashBitmap.h"
+#include "PDFDoc.h"
+#include "GfxFont.h"
+#include "AcroForm.h"
+#include "TextOutputDev.h"
+#include "SplashOutputDev.h"
+#include "ErrorCodes.h"
+#include "WebFont.h"
+#include "HTMLGen.h"
+
+#ifdef _WIN32
+# define strcasecmp stricmp
+# define strncasecmp strnicmp
+#endif
+
+//------------------------------------------------------------------------
+
+struct FontStyleTagInfo {
+ const char *tag;
+ int tagLen;
+ GBool bold;
+ GBool italic;
+};
+
+// NB: these are compared, in order, against the tail of the font
+// name, so "BoldItalic" must come before "Italic", etc.
+static FontStyleTagInfo fontStyleTags[] = {
+ {"Roman", 5, gFalse, gFalse},
+ {"Regular", 7, gFalse, gFalse},
+ {"Condensed", 9, gFalse, gFalse},
+ {"CondensedBold", 13, gTrue, gFalse},
+ {"CondensedLight", 14, gFalse, gFalse},
+ {"SemiBold", 8, gTrue, gFalse},
+ {"BoldItalicMT", 12, gTrue, gTrue},
+ {"BoldItalic", 10, gTrue, gTrue},
+ {"Bold_Italic", 11, gTrue, gTrue},
+ {"BoldOblique", 11, gTrue, gTrue},
+ {"Bold_Oblique", 12, gTrue, gTrue},
+ {"BoldMT", 6, gTrue, gFalse},
+ {"Bold", 4, gTrue, gFalse},
+ {"ItalicMT", 8, gFalse, gTrue},
+ {"Italic", 6, gFalse, gTrue},
+ {"Oblique", 7, gFalse, gTrue},
+ {"Light", 5, gFalse, gFalse},
+ {NULL, 0, gFalse, gFalse}
+};
+
+struct StandardFontInfo {
+ const char *name;
+ GBool fixedWidth;
+ GBool serif;
+};
+
+static StandardFontInfo standardFonts[] = {
+ {"Arial", gFalse, gFalse},
+ {"Courier", gTrue, gFalse},
+ {"Futura", gFalse, gFalse},
+ {"Helvetica", gFalse, gFalse},
+ {"Minion", gFalse, gTrue},
+ {"NewCenturySchlbk", gFalse, gTrue},
+ {"Times", gFalse, gTrue},
+ {"TimesNew", gFalse, gTrue},
+ {"Times_New", gFalse, gTrue},
+ {"Verdana", gFalse, gFalse},
+ {"LucidaSans", gFalse, gFalse},
+ {NULL, gFalse, gFalse}
+};
+
+struct SubstFontInfo {
+ double mWidth;
+};
+
+// index: {fixed:8, serif:4, sans-serif:0} + bold*2 + italic
+static SubstFontInfo substFonts[16] = {
+ {0.833},
+ {0.833},
+ {0.889},
+ {0.889},
+ {0.788},
+ {0.722},
+ {0.833},
+ {0.778},
+ {0.600},
+ {0.600},
+ {0.600},
+ {0.600}
+};
+
+// Map Unicode indexes from the private use area, following the Adobe
+// Glyph list.
+#define privateUnicodeMapStart 0xf6f9
+#define privateUnicodeMapEnd 0xf7ff
+static int
+privateUnicodeMap[privateUnicodeMapEnd - privateUnicodeMapStart + 1] = {
+ 0x0141, 0x0152, 0, 0, 0x0160, 0, 0x017d, // f6f9
+ 0, 0, 0, 0, 0, 0, 0, 0, // f700
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f710
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0x0021, 0, 0, 0x0024, 0, 0x0026, 0, // f720
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, // f730
+ 0x0038, 0x0039, 0, 0, 0, 0, 0, 0x003f,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f740
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f750
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, // f760
+ 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
+ 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, // f770
+ 0x0058, 0x0059, 0x005a, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f780
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f790
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0x00a1, 0x00a2, 0, 0, 0, 0, 0, // f7a0
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f7b0
+ 0, 0, 0, 0, 0, 0, 0, 0x00bf,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f7c0
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, // f7d0
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7, // f7e0
+ 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
+ 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0, // f7f0
+ 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x0178
+};
+
+enum VerticalAlignment {
+ vertAlignBaseline,
+ vertAlignSub,
+ vertAlignSuper,
+ vertAlignTop
+};
+
+static const char *vertAlignNames[] = {
+ "baseline",
+ "sub",
+ "super",
+ "top"
+};
+
+//------------------------------------------------------------------------
+
+class HTMLGenFontDefn {
+public:
+
+ HTMLGenFontDefn(Ref fontIDA, GString *fontFaceA, GString *fontSpecA,
+ double scaleA)
+ : fontID(fontIDA), fontFace(fontFaceA), fontSpec(fontSpecA)
+ , scale(scaleA), used(gFalse) {}
+ ~HTMLGenFontDefn() { delete fontFace; delete fontSpec; }
+ GBool match(Ref fontIDA)
+ { return fontIDA.num == fontID.num && fontIDA.gen == fontID.gen; }
+
+ Ref fontID;
+ GString *fontFace; // NULL for substituted fonts
+ GString *fontSpec;
+ double scale;
+ GBool used; // set when used (per page)
+};
+
+//------------------------------------------------------------------------
+
+class HTMLGenFormFieldInfo {
+public:
+
+ HTMLGenFormFieldInfo(AcroFormField *acroFormFieldA)
+ : acroFormField(acroFormFieldA) {}
+
+ AcroFormField *acroFormField;
+};
+
+//------------------------------------------------------------------------
+
+class Base64Encoder {
+public:
+
+ Base64Encoder(int (*writeFuncA)(void *stream, const char *data, int size),
+ void *streamA);
+ void encode(const unsigned char *data, size_t size);
+ void flush();
+
+private:
+
+ int (*writeFunc)(void *stream, const char *data, int size);
+ void *stream;
+ unsigned char buf[3];
+ int bufLen;
+};
+
+static char base64Chars[65] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+Base64Encoder::Base64Encoder(int (*writeFuncA)(void *stream, const char *data,
+ int size),
+ void *streamA) {
+ writeFunc = writeFuncA;
+ stream = streamA;
+ bufLen = 0;
+}
+
+void Base64Encoder::encode(const unsigned char *data, size_t size) {
+ size_t i = 0;
+ while (1) {
+ while (bufLen < 3) {
+ if (i >= size) {
+ return;
+ }
+ buf[bufLen++] = data[i++];
+ }
+ char out[4];
+ out[0] = base64Chars[(buf[0] >> 2) & 0x3f];
+ out[1] = base64Chars[((buf[0] << 4) | (buf[1] >> 4)) & 0x3f];
+ out[2] = base64Chars[((buf[1] << 2) | (buf[2] >> 6)) & 0x3f];
+ out[3] = base64Chars[buf[2] & 0x3f];
+ writeFunc(stream, out, 4);
+ bufLen = 0;
+ }
+}
+
+void Base64Encoder::flush() {
+ // if bufLen == 0, this does nothing
+ // bufLen should never be 3 here
+ char out[4];
+ if (bufLen == 1) {
+ out[0] = base64Chars[(buf[0] >> 2) & 0x3f];
+ out[1] = base64Chars[(buf[0] << 4) & 0x3f];
+ out[2] = '=';
+ out[3] = '=';
+ writeFunc(stream, out, 4);
+ } else if (bufLen == 2) {
+ out[0] = base64Chars[(buf[0] >> 2) & 0x3f];
+ out[1] = base64Chars[((buf[0] << 4) | (buf[1] >> 4)) & 0x3f];
+ out[2] = base64Chars[(buf[1] << 2) & 0x3f];
+ out[3] = '=';
+ writeFunc(stream, out, 4);
+ }
+}
+
+static int writeToString(void *stream, const char *data, int size) {
+ ((GString *)stream)->append(data, size);
+ return size;
+}
+
+//------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------
+
+HTMLGen::HTMLGen(double backgroundResolutionA, GBool tableMode) {
+ TextOutputControl textOutControl;
+ SplashColor paperColor;
+
+ ok = gTrue;
+
+ backgroundResolution = backgroundResolutionA;
+ zoom = 1.0;
+ vStretch = 1.0;
+ drawInvisibleText = gTrue;
+ allTextInvisible = gFalse;
+ extractFontFiles = gFalse;
+ convertFormFields = gFalse;
+ embedBackgroundImage = gFalse;
+ embedFonts = gFalse;
+
+ // set up the TextOutputDev
+ textOutControl.mode = tableMode ? textOutTableLayout : textOutReadingOrder;
+ textOutControl.html = gTrue;
+ textOutControl.splitRotatedWords = gTrue;
+ textOut = new TextOutputDev(NULL, &textOutControl, gFalse);
+ if (!textOut->isOk()) {
+ ok = gFalse;
+ }
+
+ // set up the SplashOutputDev
+ paperColor[0] = paperColor[1] = paperColor[2] = 0xff;
+ splashOut = new SplashOutputDev(splashModeRGB8, 1, gFalse, paperColor);
+
+ fontDefns = NULL;
+}
+
+HTMLGen::~HTMLGen() {
+ delete textOut;
+ delete splashOut;
+ if (fontDefns) {
+ deleteGList(fontDefns, HTMLGenFontDefn);
+ }
+}
+
+void HTMLGen::startDoc(PDFDoc *docA) {
+ doc = docA;
+ splashOut->startDoc(doc->getXRef());
+
+ if (fontDefns) {
+ deleteGList(fontDefns, HTMLGenFontDefn);
+ }
+ fontDefns = new GList();
+ nextFontFaceIdx = 0;
+}
+
+static inline int pr(int (*writeFunc)(void *stream, const char *data, int size),
+ void *stream, const char *data) {
+ return writeFunc(stream, data, (int)strlen(data));
+}
+
+static int pf(int (*writeFunc)(void *stream, const char *data, int size),
+ void *stream, const char *fmt, ...) {
+ va_list args;
+ GString *s;
+ int ret;
+
+ va_start(args, fmt);
+ s = GString::formatv(fmt, args);
+ va_end(args);
+ ret = writeFunc(stream, s->getCString(), s->getLength());
+ delete s;
+ return ret;
+}
+
+struct PNGWriteInfo {
+ Base64Encoder *base64;
+ int (*writePNG)(void *stream, const char *data, int size);
+ void *pngStream;
+};
+
+static void pngWriteFunc(png_structp png, png_bytep data, png_size_t size) {
+ PNGWriteInfo *info = (PNGWriteInfo *)png_get_progressive_ptr(png);
+ if (info->base64) {
+ info->base64->encode(data, size);
+ } else {
+ info->writePNG(info->pngStream, (char *)data, (int)size);
+ }
+}
+
+int HTMLGen::convertPage(
+ int pg, const char *pngURL, const char *htmlDir,
+ int (*writeHTML)(void *stream, const char *data, int size),
+ void *htmlStream,
+ int (*writePNG)(void *stream, const char *data, int size),
+ void *pngStream) {
+ png_structp png;
+ png_infop pngInfo;
+ PNGWriteInfo writeInfo;
+ SplashBitmap *bitmap;
+ Guchar *p;
+ double pageW, pageH;
+ TextPage *text;
+ GList *cols, *pars, *lines, *words;
+ TextFontInfo *font;
+ TextColumn *col;
+ TextParagraph *par;
+ TextLine *line;
+ HTMLGenFontDefn *fontDefn;
+ GString *s;
+ double base;
+ int primaryDir, spanDir;
+ int colIdx, parIdx, lineIdx, firstWordIdx, lastWordIdx;
+ int y, i;
+
+ // generate the background bitmap
+ splashOut->setSkipText(!allTextInvisible, gFalse);
+ doc->displayPage(splashOut, pg,
+ backgroundResolution, backgroundResolution * vStretch,
+ 0, gFalse, gTrue, gFalse);
+ bitmap = splashOut->getBitmap();
+
+ // page size
+ if (doc->getPageRotate(pg) == 90 || doc->getPageRotate(pg) == 270) {
+ pageW = doc->getPageCropHeight(pg);
+ pageH = doc->getPageCropWidth(pg);
+ } else {
+ pageW = doc->getPageCropWidth(pg);
+ pageH = doc->getPageCropHeight(pg);
+ }
+
+ // get the PDF text
+ doc->displayPage(textOut, pg, 72, 72, 0, gFalse, gTrue, gFalse);
+ doc->processLinks(textOut, pg);
+ text = textOut->takeText();
+ primaryDir = text->primaryDirectionIsLR() ? 1 : -1;
+
+ // insert a special character for each form field;
+ // remove existing characters inside field bboxes;
+ // erase background content inside field bboxes
+ formFieldFont = NULL;
+ formFieldInfo = NULL;
+ if (convertFormFields) {
+ AcroForm *form = doc->getCatalog()->getForm();
+ if (form) {
+ formFieldInfo = new GList();
+ formFieldFont = new TextFontInfo();
+ double yTop = doc->getCatalog()->getPage(pg)->getMediaBox()->y2;
+ for (i = 0; i < form->getNumFields(); ++i) {
+ AcroFormField *field = form->getField(i);
+ AcroFormFieldType fieldType = field->getAcroFormFieldType();
+ if (field->getPageNum() == pg &&
+ (fieldType == acroFormFieldText ||
+ fieldType == acroFormFieldCheckbox)) {
+ double llx, lly, urx, ury;
+ field->getBBox(&llx, &lly, &urx, &ury);
+ lly = yTop - lly;
+ ury = yTop - ury;
+
+ // add the field info
+ int fieldIdx = formFieldInfo->getLength();
+ formFieldInfo->append(new HTMLGenFormFieldInfo(field));
+
+ // remove exsting chars
+ text->removeChars(llx, ury, urx, lly, 0.75, 0.5);
+
+ // erase background content
+ int llxI = (int)(llx * backgroundResolution / 72 + 0.5);
+ int llyI = (int)(lly * backgroundResolution * vStretch / 72 + 0.5);
+ int urxI = (int)(urx * backgroundResolution / 72 + 0.5);
+ int uryI = (int)(ury * backgroundResolution * vStretch / 72 + 0.5);
+ llyI += (int)(backgroundResolution * vStretch / 20);
+ if (llxI < 0) {
+ llxI = 0;
+ }
+ if (urxI >= bitmap->getWidth()) {
+ urxI = bitmap->getWidth() - 1;
+ }
+ if (uryI < 0) {
+ uryI = 0;
+ }
+ if (llyI > bitmap->getHeight()) {
+ llyI = bitmap->getHeight() - 1;
+ }
+ if (uryI <= llyI && llxI <= urxI) {
+ SplashColorPtr p = bitmap->getDataPtr()
+ + uryI * bitmap->getRowSize() + llxI * 3;
+ for (int y = uryI; y <= llyI; ++y) {
+ memset(p, 0xff, (urxI - llxI + 1) * 3);
+ p += bitmap->getRowSize();
+ }
+ }
+
+ // add a special char
+ // (the font size is unused -- 10 is an arbitrary value)
+ text->addSpecialChar(llx, ury, urx, lly,
+ 0, formFieldFont, 10, 0x80000000 + fieldIdx);
+ }
+ }
+ }
+ }
+
+ // HTML header
+ pr(writeHTML, htmlStream, "<html>\n");
+ pr(writeHTML, htmlStream, "<head>\n");
+ pr(writeHTML, htmlStream, "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n");
+ pr(writeHTML, htmlStream, "<style type=\"text/css\">\n");
+ pr(writeHTML, htmlStream, ".txt { white-space:nowrap; }\n");
+ if (convertFormFields) {
+ pr(writeHTML, htmlStream, ".textfield {\n");
+ pr(writeHTML, htmlStream, " border: 0;\n");
+ pr(writeHTML, htmlStream, " padding: 0;\n");
+ pr(writeHTML, htmlStream, " background: #ccccff;\n");
+ pr(writeHTML, htmlStream, "}\n");
+ pr(writeHTML, htmlStream, ".checkbox {\n");
+ pr(writeHTML, htmlStream, "}\n");
+ }
+ fonts = text->getFonts();
+ fontScales = (double *)gmallocn(fonts->getLength(), sizeof(double));
+ for (i = 0; i < fontDefns->getLength(); ++i) {
+ fontDefn = (HTMLGenFontDefn *)fontDefns->get(i);
+ fontDefn->used = gFalse;
+ }
+ for (i = 0; i < fonts->getLength(); ++i) {
+ font = (TextFontInfo *)fonts->get(i);
+ fontDefn = getFontDefn(font, htmlDir);
+ if (!fontDefn->used && fontDefn->fontFace) {
+ pr(writeHTML, htmlStream, fontDefn->fontFace->getCString());
+ }
+ pf(writeHTML, htmlStream, ".f{0:d} {{ {1:t} }}\n", i, fontDefn->fontSpec);
+ fontScales[i] = fontDefn->scale;
+ fontDefn->used = gTrue;
+ }
+ pr(writeHTML, htmlStream, "</style>\n");
+ pr(writeHTML, htmlStream, "</head>\n");
+ if (primaryDir >= 0) {
+ pr(writeHTML, htmlStream, "<body>\n");
+ } else {
+ pr(writeHTML, htmlStream, "<body dir=\"rtl\">\n");
+ }
+
+ // background image element (part 1)
+ if (primaryDir >= 0) {
+ pf(writeHTML, htmlStream, "<img style=\"position:absolute; left:0px; top:0px;\" width=\"{0:d}\" height=\"{1:d}\" ",
+ (int)(pageW * zoom), (int)(pageH * zoom * vStretch));
+ } else {
+ pf(writeHTML, htmlStream, "<img style=\"position:absolute; right:0px; top:0px;\" width=\"{0:d}\" height=\"{1:d}\" ",
+ (int)(pageW * zoom), (int)(pageH * zoom * vStretch));
+ }
+ if (embedBackgroundImage) {
+ pr(writeHTML, htmlStream, "src=\"data:image/png;base64,\n");
+ writeInfo.base64 = new Base64Encoder(writeHTML, htmlStream);
+ writeInfo.writePNG = NULL;
+ writeInfo.pngStream = NULL;
+ } else {
+ pf(writeHTML, htmlStream, "src=\"{0:s}\"", pngURL);
+ writeInfo.base64 = NULL;
+ writeInfo.writePNG = writePNG;
+ writeInfo.pngStream = pngStream;
+ }
+
+ // background image data - writing to a separate file, or embedding
+ // with base64 encoding
+ if (!(png = png_create_write_struct(PNG_LIBPNG_VER_STRING,
+ NULL, NULL, NULL)) ||
+ !(pngInfo = png_create_info_struct(png))) {
+ return errFileIO;
+ }
+ if (setjmp(png_jmpbuf(png))) {
+ return errFileIO;
+ }
+ png_set_write_fn(png, &writeInfo, pngWriteFunc, NULL);
+ png_set_IHDR(png, pngInfo, bitmap->getWidth(), bitmap->getHeight(),
+ 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+ png_write_info(png, pngInfo);
+ p = bitmap->getDataPtr();
+ for (y = 0; y < bitmap->getHeight(); ++y) {
+ png_write_row(png, (png_bytep)p);
+ p += bitmap->getRowSize();
+ }
+ png_write_end(png, pngInfo);
+ png_destroy_write_struct(&png, &pngInfo);
+ if (embedBackgroundImage) {
+ writeInfo.base64->flush();
+ delete writeInfo.base64;
+ }
+
+ // background image element (part 2)
+ pr(writeHTML, htmlStream, "\">\n");
+
+ // generate the HTML text
+ nextFieldID = 0;
+ cols = text->makeColumns();
+ for (colIdx = 0; colIdx < cols->getLength(); ++colIdx) {
+ col = (TextColumn *)cols->get(colIdx);
+ pars = col->getParagraphs();
+ for (parIdx = 0; parIdx < pars->getLength(); ++parIdx) {
+ par = (TextParagraph *)pars->get(parIdx);
+ lines = par->getLines();
+ for (lineIdx = 0; lineIdx < lines->getLength(); ++lineIdx) {
+ line = (TextLine *)lines->get(lineIdx);
+ if (line->getRotation() != 0) {
+ continue;
+ }
+ words = line->getWords();
+ if (lineIdx == 0 && par->hasDropCap() && words->getLength() >= 2) {
+ base = ((TextWord *)words->get(1))->getBaseline();
+ } else {
+ base = line->getBaseline();
+ }
+ s = new GString();
+ for (firstWordIdx = (primaryDir >= 0) ? 0 : words->getLength() - 1;
+ (primaryDir >= 0) ? firstWordIdx < words->getLength()
+ : firstWordIdx >= 0;
+ firstWordIdx = lastWordIdx + primaryDir) {
+ lastWordIdx = findDirSpan(words, firstWordIdx,
+ primaryDir, &spanDir);
+ appendSpans(words, firstWordIdx, lastWordIdx,
+ primaryDir, spanDir,
+ base, lineIdx == 0 && par->hasDropCap(),
+ s);
+ }
+ if (primaryDir >= 0) {
+ pf(writeHTML, htmlStream, "<div class=\"txt\" style=\"position:absolute; left:{0:d}px; top:{1:d}px;\">{2:t}</div>\n",
+ (int)(line->getXMin() * zoom),
+ (int)(line->getYMin() * zoom * vStretch), s);
+ } else {
+ pf(writeHTML, htmlStream, "<div class=\"txt\" style=\"position:absolute; right:{0:d}px; top:{1:d}px;\">{2:t}</div>\n",
+ (int)((pageW - line->getXMax()) * zoom),
+ (int)(line->getYMin() * zoom * vStretch), s);
+ }
+ delete s;
+ }
+ }
+ }
+ gfree(fontScales);
+ delete text;
+ deleteGList(cols, TextColumn);
+ if (formFieldFont) {
+ delete formFieldFont;
+ formFieldFont = NULL;
+ }
+ if (formFieldInfo) {
+ deleteGList(formFieldInfo, HTMLGenFormFieldInfo);
+ formFieldInfo = NULL;
+ }
+
+ // HTML trailer
+ pr(writeHTML, htmlStream, "</body>\n");
+ pr(writeHTML, htmlStream, "</html>\n");
+
+ return errNone;
+}
+
+// Find a sequence of words, starting at <firstWordIdx>, that have the
+// same writing direction. Returns the index of the last word, and
+// sets *<spanDir> to the span direction.
+int HTMLGen::findDirSpan(GList *words, int firstWordIdx, int primaryDir,
+ int *spanDir) {
+ int dir0, dir1, nextWordIdx;
+
+ dir0 = ((TextWord *)words->get(firstWordIdx))->getDirection();
+ for (nextWordIdx = firstWordIdx + primaryDir;
+ (primaryDir >= 0) ? nextWordIdx < words->getLength()
+ : nextWordIdx >= 0;
+ nextWordIdx += primaryDir) {
+ dir1 = ((TextWord *)words->get(nextWordIdx))->getDirection();
+ if (dir0 == 0) {
+ dir0 = dir1;
+ } else if (dir1 != 0 && dir1 != dir0) {
+ break;
+ }
+ }
+
+ if (dir0 == 0) {
+ *spanDir = primaryDir;
+ } else {
+ *spanDir = dir0;
+ }
+
+ return nextWordIdx - primaryDir;
+}
+
+// Create HTML spans for words <firstWordIdx> .. <lastWordIdx>, and
+// append them to <s>.
+void HTMLGen::appendSpans(GList *words, int firstWordIdx, int lastWordIdx,
+ int primaryDir, int spanDir,
+ double base, GBool dropCapLine, GString *s) {
+ if (allTextInvisible && !drawInvisibleText) {
+ return;
+ }
+
+ if (spanDir != primaryDir) {
+ int t = firstWordIdx;
+ firstWordIdx = lastWordIdx;
+ lastWordIdx = t;
+ }
+
+ int wordIdx = firstWordIdx;
+ while ((spanDir >= 0) ? wordIdx <= lastWordIdx
+ : wordIdx >= lastWordIdx) {
+ TextWord *word0 = (TextWord *)words->get(wordIdx);
+
+ // form field(s): generate <input> element(s)
+ if (convertFormFields && word0->getFontInfo() == formFieldFont) {
+ for (int i = (spanDir >= 0) ? 0 : word0->getLength() - 1;
+ (spanDir >= 0) ? i < word0->getLength() : i >= 0;
+ i += spanDir) {
+ int fieldIdx = word0->getChar(0) - 0x80000000;
+ if (fieldIdx >= 0 && fieldIdx < formFieldInfo->getLength()) {
+ HTMLGenFormFieldInfo *ffi =
+ (HTMLGenFormFieldInfo *)formFieldInfo->get(fieldIdx);
+ AcroFormField *field = ffi->acroFormField;
+ AcroFormFieldType fieldType = field->getAcroFormFieldType();
+ double llx, lly, urx, ury;
+ field->getBBox(&llx, &lly, &urx, &ury);
+ int width = (int)(urx - llx);
+ Ref fontID;
+ double fontSize;
+ field->getFont(&fontID, &fontSize);
+ if (fontSize == 0) {
+ fontSize = 12;
+ }
+ if (fieldType == acroFormFieldText) {
+ s->appendf("<input type=\"text\" class=\"textfield\" id=\"textfield{0:d}\" style=\"width:{1:d}px; font-size:{2:d}px;\">", nextFieldID, width, (int)(fontSize + 0.5));
+ ++nextFieldID;
+ } else if (fieldType == acroFormFieldCheckbox) {
+ s->appendf("<input type=\"checkbox\" class=\"checkbox\" id=\"checkbox{0:d}\" style=\"width:{1:d}px; font-size:{2:d}px;\">", nextFieldID, width, (int)(fontSize + 0.5));
+ ++nextFieldID;
+ }
+ }
+ }
+
+ if (word0->getSpaceAfter()) {
+ s->append(' ');
+ }
+
+ wordIdx += spanDir;
+
+ // skip invisible words
+ } else if (!drawInvisibleText &&
+ (word0->isInvisible() || word0->isRotated())) {
+ wordIdx += spanDir;
+
+ // generate a <span> containing one or more words
+ } else {
+
+ double r0 = 0, g0 = 0, b0 = 0; // make gcc happy
+ VerticalAlignment vertAlign0 = vertAlignBaseline; // make gcc happy
+ GString *linkURI0 = NULL;
+
+ GBool invisible = word0->isInvisible() || word0->isRotated();
+
+ do {
+ TextWord *word1 = (TextWord *)words->get(wordIdx);
+
+ // get word parameters
+ double r1, g1, b1;
+ word0->getColor(&r1, &g1, &b1);
+ double base1 = word1->getBaseline();
+ VerticalAlignment vertAlign1;
+ if (dropCapLine) {
+ //~ this will fail if there are subscripts or superscripts in
+ //~ the first line of a paragraph with a drop cap
+ vertAlign1 = vertAlignTop;
+ } else if (base1 - base < -1) {
+ vertAlign1 = vertAlignSuper;
+ } else if (base1 - base > 1) {
+ vertAlign1 = vertAlignSub;
+ } else {
+ vertAlign1 = vertAlignBaseline;
+ }
+ GString *linkURI1 = word1->getLinkURI();
+
+ // start of span
+ if (word1 == word0) {
+ r0 = r1;
+ g0 = g1;
+ b0 = b1;
+ vertAlign0 = vertAlign1;
+ linkURI0 = linkURI1;
+
+ int i;
+ for (i = 0; i < fonts->getLength(); ++i) {
+ if (word1->getFontInfo() == (TextFontInfo *)fonts->get(i)) {
+ break;
+ }
+ }
+ if (linkURI1) {
+ s->appendf("<a href=\"{0:t}\">", linkURI0);
+ }
+ // we force spans to be LTR or RTL; this is a kludge, but it's
+ // far easier than implementing the full Unicode bidi algorithm
+ const char *dirTag;
+ if (spanDir == primaryDir) {
+ dirTag = "";
+ } else if (spanDir < 0) {
+ dirTag = " dir=\"rtl\"";
+ } else {
+ dirTag = " dir=\"ltr\"";
+ }
+ s->appendf("<span class=\"f{0:d}\"{1:s} style=\"font-size:{2:d}px;vertical-align:{3:s};{4:s}color:rgba({5:d},{6:d},{7:d},{8:d});\">",
+ i,
+ dirTag,
+ (int)(fontScales[i] * word1->getFontSize() * zoom),
+ vertAlignNames[vertAlign1],
+ (dropCapLine && wordIdx == 0) ? "line-height:75%;" : "",
+ (int)(r0 * 255), (int)(g0 * 255), (int)(b0 * 255),
+ invisible ? 0 : 1);
+
+ // end of span
+ } else if (word1->getFontInfo() != word0->getFontInfo() ||
+ word1->getFontSize() != word0->getFontSize() ||
+ word1->isInvisible() != word0->isInvisible() ||
+ word1->isRotated() != word0->isRotated() ||
+ vertAlign1 != vertAlign0 ||
+ r1 != r0 || g1 != g0 || b1 != b0 ||
+ linkURI1 != linkURI0) {
+ break;
+ }
+
+ // add a space before the word, if needed
+ // -- this only happens with the first word in a reverse section
+ if (spanDir != primaryDir && wordIdx == firstWordIdx) {
+ GBool sp;
+ if (spanDir >= 0) {
+ if (wordIdx > 0) {
+ sp = ((TextWord *)words->get(wordIdx - 1))->getSpaceAfter();
+ } else {
+ sp = gFalse;
+ }
+ } else {
+ sp = word1->getSpaceAfter();
+ }
+ if (sp) {
+ s->append(' ');
+ }
+ }
+
+ // generate the word text
+ for (int i = (spanDir >= 0) ? 0 : word1->getLength() - 1;
+ (spanDir >= 0) ? i < word1->getLength() : i >= 0;
+ i += spanDir) {
+ Unicode u = word1->getChar(i);
+ if (u >= privateUnicodeMapStart &&
+ u <= privateUnicodeMapEnd &&
+ privateUnicodeMap[u - privateUnicodeMapStart]) {
+ u = privateUnicodeMap[u - privateUnicodeMapStart];
+ }
+ appendUTF8(u, s);
+ }
+
+ // add a space after the word, if needed
+ // -- there is never a space after the last word in a reverse
+ // section (this will be handled as a space after the last
+ // word in the previous primary-direction section)
+ GBool sp;
+ if (spanDir != primaryDir && wordIdx == lastWordIdx) {
+ sp = gFalse;
+ } else if (spanDir >= 0) {
+ sp = word1->getSpaceAfter();
+ } else {
+ if (wordIdx > 0) {
+ sp = ((TextWord *)words->get(wordIdx - 1))->getSpaceAfter();
+ } else {
+ sp = gFalse;
+ }
+ }
+ if (sp) {
+ s->append(' ');
+ }
+
+ wordIdx += spanDir;
+ } while ((spanDir >= 0) ? wordIdx <= lastWordIdx
+ : wordIdx >= lastWordIdx);
+
+ s->append("</span>");
+ if (linkURI0) {
+ s->append("</a>");
+ }
+ }
+ }
+}
+
+void HTMLGen::appendUTF8(Unicode u, GString *s) {
+ if (u <= 0x7f) {
+ if (u == '&') {
+ s->append("&amp;");
+ } else if (u == '<') {
+ s->append("&lt;");
+ } else if (u == '>') {
+ s->append("&gt;");
+ } else {
+ s->append((char)u);
+ }
+ } else if (u <= 0x7ff) {
+ s->append((char)(0xc0 + (u >> 6)));
+ s->append((char)(0x80 + (u & 0x3f)));
+ } else if (u <= 0xffff) {
+ s->append((char)(0xe0 + (u >> 12)));
+ s->append((char)(0x80 + ((u >> 6) & 0x3f)));
+ s->append((char)(0x80 + (u & 0x3f)));
+ } else if (u <= 0x1fffff) {
+ s->append((char)(0xf0 + (u >> 18)));
+ s->append((char)(0x80 + ((u >> 12) & 0x3f)));
+ s->append((char)(0x80 + ((u >> 6) & 0x3f)));
+ s->append((char)(0x80 + (u & 0x3f)));
+ } else if (u <= 0x3ffffff) {
+ s->append((char)(0xf8 + (u >> 24)));
+ s->append((char)(0x80 + ((u >> 18) & 0x3f)));
+ s->append((char)(0x80 + ((u >> 12) & 0x3f)));
+ s->append((char)(0x80 + ((u >> 6) & 0x3f)));
+ s->append((char)(0x80 + (u & 0x3f)));
+ } else if (u <= 0x7fffffff) {
+ s->append((char)(0xfc + (u >> 30)));
+ s->append((char)(0x80 + ((u >> 24) & 0x3f)));
+ s->append((char)(0x80 + ((u >> 18) & 0x3f)));
+ s->append((char)(0x80 + ((u >> 12) & 0x3f)));
+ s->append((char)(0x80 + ((u >> 6) & 0x3f)));
+ s->append((char)(0x80 + (u & 0x3f)));
+ }
+}
+
+HTMLGenFontDefn *HTMLGen::getFontDefn(TextFontInfo *font,
+ const char *htmlDir) {
+ Ref id;
+ HTMLGenFontDefn *fontDefn;
+ int i;
+
+ // check the existing font defns
+ id = font->getFontID();
+ if (id.num >= 0) {
+ for (i = 0; i < fontDefns->getLength(); ++i) {
+ fontDefn = (HTMLGenFontDefn *)fontDefns->get(i);
+ if (fontDefn->match(id)) {
+ return fontDefn;
+ }
+ }
+ }
+
+ // try to extract a font file
+ if (!extractFontFiles ||
+ !(fontDefn = getFontFile(font, htmlDir))) {
+
+ // get a substitute font
+ fontDefn = getSubstituteFont(font);
+ }
+
+ fontDefns->append(fontDefn);
+ return fontDefn;
+}
+
+HTMLGenFontDefn *HTMLGen::getFontFile(TextFontInfo *font,
+ const char *htmlDir) {
+ Ref id;
+ HTMLGenFontDefn *fontDefn;
+ Object fontObj;
+ GfxFont *gfxFont;
+ WebFont *webFont;
+ GString *fontFile, *fontPath, *fontFace, *fontSpec;
+ const char *family, *weight, *style;
+ double scale;
+
+ id = font->getFontID();
+ if (id.num < 0) {
+ return NULL;
+ }
+
+ doc->getXRef()->fetch(id.num, id.gen, &fontObj);
+ if (!fontObj.isDict()) {
+ fontObj.free();
+ return NULL;
+ }
+
+ gfxFont = GfxFont::makeFont(doc->getXRef(), "F", id, fontObj.getDict());
+ webFont = new WebFont(gfxFont, doc->getXRef());
+ fontDefn = NULL;
+ fontFace = NULL;
+
+ if (webFont->canWriteTTF()) {
+ if (embedFonts) {
+ GString *ttfData = webFont->getTTFData();
+ if (ttfData) {
+ fontFace = GString::format("@font-face {{ font-family: ff{0:d}; src: url(\"data:font/ttf;base64,",
+ nextFontFaceIdx);
+ Base64Encoder enc(writeToString, fontFace);
+ enc.encode((unsigned char *)ttfData->getCString(),
+ (size_t)ttfData->getLength());
+ enc.flush();
+ fontFace->append("\"); }\n");
+ delete ttfData;
+ }
+ } else {
+ fontFile = GString::format("{0:d}.ttf", nextFontFaceIdx);
+ fontPath = GString::format("{0:s}/{1:t}", htmlDir, fontFile);
+ if (webFont->writeTTF(fontPath->getCString())) {
+ fontFace = GString::format("@font-face {{ font-family: ff{0:d}; src: url(\"{1:t}\"); }}\n",
+ nextFontFaceIdx, fontFile);
+ }
+ delete fontPath;
+ delete fontFile;
+ }
+ if (fontFace) {
+ getFontDetails(font, &family, &weight, &style, &scale);
+ fontSpec = GString::format("font-family:ff{0:d},{1:s}; font-weight:{2:s}; font-style:{3:s};",
+ nextFontFaceIdx, family, weight, style);
+ ++nextFontFaceIdx;
+ fontDefn = new HTMLGenFontDefn(id, fontFace, fontSpec, 1.0);
+ }
+
+ } else if (webFont->canWriteOTF()) {
+ if (embedFonts) {
+ GString *otfData = webFont->getOTFData();
+ if (otfData) {
+ fontFace = GString::format("@font-face {{ font-family: ff{0:d}; src: url(\"data:font/otf;base64,",
+ nextFontFaceIdx);
+ Base64Encoder enc(writeToString, fontFace);
+ enc.encode((unsigned char *)otfData->getCString(),
+ (size_t)otfData->getLength());
+ enc.flush();
+ fontFace->append("\"); }\n");
+ delete otfData;
+ }
+ } else {
+ fontFile = GString::format("{0:d}.otf", nextFontFaceIdx);
+ fontPath = GString::format("{0:s}/{1:t}", htmlDir, fontFile);
+ if (webFont->writeOTF(fontPath->getCString())) {
+ fontFace = GString::format("@font-face {{ font-family: ff{0:d}; src: url(\"{1:t}\"); }}\n",
+ nextFontFaceIdx, fontFile);
+ }
+ delete fontPath;
+ delete fontFile;
+ }
+ if (fontFace) {
+ getFontDetails(font, &family, &weight, &style, &scale);
+ fontSpec = GString::format("font-family:ff{0:d},{1:s}; font-weight:{2:s}; font-style:{3:s};",
+ nextFontFaceIdx, family, weight, style);
+ ++nextFontFaceIdx;
+ fontDefn = new HTMLGenFontDefn(id, fontFace, fontSpec, 1.0);
+ }
+ }
+
+ delete webFont;
+ delete gfxFont;
+ fontObj.free();
+
+ return fontDefn;
+}
+
+HTMLGenFontDefn *HTMLGen::getSubstituteFont(TextFontInfo *font) {
+ const char *family, *weight, *style;
+ double scale;
+ GString *fontSpec;
+
+ getFontDetails(font, &family, &weight, &style, &scale);
+ fontSpec = GString::format("font-family:{0:s}; font-weight:{1:s}; font-style:{2:s};",
+ family, weight, style);
+ return new HTMLGenFontDefn(font->getFontID(), NULL, fontSpec, scale);
+}
+
+void HTMLGen::getFontDetails(TextFontInfo *font, const char **family,
+ const char **weight, const char **style,
+ double *scale) {
+ GString *fontName;
+ char *fontName2;
+ FontStyleTagInfo *fst;
+ StandardFontInfo *sf;
+ GBool fixedWidth, serif, bold, italic;
+ double s;
+ int n, i;
+
+ // get the font name, remove any subset tag
+ fontName = font->getFontName();
+ if (fontName) {
+ fontName2 = fontName->getCString();
+ n = fontName->getLength();
+ for (i = 0; i < n && i < 7; ++i) {
+ if (fontName2[i] < 'A' || fontName2[i] > 'Z') {
+ break;
+ }
+ }
+ if (i == 6 && n > 7 && fontName2[6] == '+') {
+ fontName2 += 7;
+ n -= 7;
+ }
+ } else {
+ fontName2 = NULL;
+ n = 0;
+ }
+
+ // get the style info from the font descriptor flags
+ fixedWidth = font->isFixedWidth();
+ serif = font->isSerif();
+ bold = font->isBold();
+ italic = font->isItalic();
+
+ if (fontName2) {
+
+ // look for a style tag at the end of the font name -- this
+ // overrides the font descriptor bold/italic flags
+ for (fst = fontStyleTags; fst->tag; ++fst) {
+ if (n > fst->tagLen &&
+ !strcasecmp(fontName2 + n - fst->tagLen, fst->tag)) {
+ bold = fst->bold;
+ italic = fst->italic;
+ n -= fst->tagLen;
+ if (n > 1 && (fontName2[n-1] == '-' ||
+ fontName2[n-1] == ',' ||
+ fontName2[n-1] == '.' ||
+ fontName2[n-1] == '_')) {
+ --n;
+ }
+ break;
+ }
+ }
+
+ // look for a known font name -- this overrides the font descriptor
+ // fixedWidth/serif flags
+ for (sf = standardFonts; sf->name; ++sf) {
+ if (!strncasecmp(fontName2, sf->name, n)) {
+ fixedWidth = sf->fixedWidth;
+ serif = sf->serif;
+ break;
+ }
+ }
+ }
+
+ // compute the scaling factor
+ *scale = 1;
+ if ((s = font->getMWidth())) {
+ i = (fixedWidth ? 8 : serif ? 4 : 0) + (bold ? 2 : 0) + (italic ? 1 : 0);
+ if (s < substFonts[i].mWidth) {
+ *scale = s / substFonts[i].mWidth;
+ }
+ }
+
+ *family = fixedWidth ? "monospace" : serif ? "serif" : "sans-serif";
+ *weight = bold ? "bold" : "normal";
+ *style = italic ? "italic" : "normal";
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-31 08:52:08 +0000