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-rw-r--r--pdf/xpdf/TextOutputDev.cc389
1 files changed, 246 insertions, 143 deletions
diff --git a/pdf/xpdf/TextOutputDev.cc b/pdf/xpdf/TextOutputDev.cc
index b782b42..3fcc9ec 100644
--- a/pdf/xpdf/TextOutputDev.cc
+++ b/pdf/xpdf/TextOutputDev.cc
@@ -2,7 +2,7 @@
//
// TextOutputDev.cc
//
-// Copyright 1997-2002 Glyph & Cog, LLC
+// Copyright 1997-2003 Glyph & Cog, LLC
//
//========================================================================
@@ -17,6 +17,10 @@
#include <stddef.h>
#include <math.h>
#include <ctype.h>
+#ifdef WIN32
+#include <fcntl.h> // for O_BINARY
+#include <io.h> // for setmode
+#endif
#include "gmem.h"
#include "GString.h"
#include "GList.h"
@@ -49,7 +53,7 @@
// Max difference in x,y coordinates (as a fraction of the font size)
// allowed for duplicated text (fake boldface, drop shadows) which is
// to be discarded.
-#define dupMaxDeltaX 0.2
+#define dupMaxDeltaX 0.1
#define dupMaxDeltaY 0.2
// Min overlap (as a fraction of the font size) required for two
@@ -124,14 +128,11 @@ TextFontInfo::TextFontInfo(GfxState *state) {
horizScaling *= t1 / t2;
}
- if (!gfxFont) {
- minSpaceWidth = horizScaling * wordDefMinSpaceWidth;
- maxSpaceWidth = horizScaling * wordDefMaxSpaceWidth;
- } else if (gfxFont->isCIDFont()) {
+ minSpaceWidth = horizScaling * wordDefMinSpaceWidth;
+ maxSpaceWidth = horizScaling * wordDefMaxSpaceWidth;
+ if (gfxFont && gfxFont->isCIDFont()) {
//~ handle 16-bit fonts
- minSpaceWidth = horizScaling * wordDefMinSpaceWidth;
- maxSpaceWidth = horizScaling * wordDefMaxSpaceWidth;
- } else {
+ } else if (gfxFont && gfxFont->getType() != fontType3) {
avgWidth = 0;
n = 0;
for (i = 0; i < 256; ++i) {
@@ -141,9 +142,11 @@ TextFontInfo::TextFontInfo(GfxState *state) {
++n;
}
}
- avgWidth /= n;
- minSpaceWidth = horizScaling * wordMinSpaceWidth * avgWidth;
- maxSpaceWidth = horizScaling * wordMaxSpaceWidth * avgWidth;
+ if (n > 0) {
+ avgWidth /= n;
+ minSpaceWidth = horizScaling * wordMinSpaceWidth * avgWidth;
+ maxSpaceWidth = horizScaling * wordMaxSpaceWidth * avgWidth;
+ }
}
}
@@ -169,11 +172,13 @@ GBool TextFontInfo::matches(GfxState *state) {
// TextWord
//------------------------------------------------------------------------
-TextWord::TextWord(GfxState *state, double x0, double y0,
+TextWord::TextWord(GfxState *state, double x0, double y0, int charPosA,
TextFontInfo *fontA, double fontSizeA) {
GfxFont *gfxFont;
double x, y;
+ charPos = charPosA;
+ charLen = 0;
font = fontA;
fontSize = fontSizeA;
state->transform(x0, y0, &x, &y);
@@ -249,6 +254,7 @@ void TextWord::merge(TextWord *word2) {
xRight[len + i] = word2->xRight[i];
}
len += word2->len;
+ charLen += word2->charLen;
}
//------------------------------------------------------------------------
@@ -299,7 +305,6 @@ GBool TextLine::yxBefore(TextLine *line2) {
// Merge another line's words onto the end of this line.
void TextLine::merge(TextLine *line2) {
- TextWord *word;
int newLen, i;
xMax = line2->xMax;
@@ -310,9 +315,9 @@ void TextLine::merge(TextLine *line2) {
yMax = line2->yMax;
}
xSpaceR = line2->xSpaceR;
- for (word = words; word->next; word = word->next) ;
- word->spaceAfter = gTrue;
- word->next = line2->words;
+ lastWord->spaceAfter = gTrue;
+ lastWord->next = line2->words;
+ lastWord = line2->lastWord;
line2->words = NULL;
newLen = len + 1 + line2->len;
text = (Unicode *)grealloc(text, newLen * sizeof(Unicode));
@@ -424,6 +429,7 @@ TextFlow::~TextFlow() {
TextPage::TextPage(GBool rawOrderA) {
rawOrder = rawOrderA;
curWord = NULL;
+ charPos = 0;
font = NULL;
fontSize = 0;
nest = 0;
@@ -516,7 +522,7 @@ void TextPage::beginWord(GfxState *state, double x0, double y0) {
return;
}
- curWord = new TextWord(state, x0, y0, font, fontSize);
+ curWord = new TextWord(state, x0, y0, charPos, font, fontSize);
}
void TextPage::addChar(GfxState *state, double x, double y,
@@ -558,6 +564,8 @@ void TextPage::addChar(GfxState *state, double x, double y,
// break words at space character
if (uLen == 1 && u[0] == (Unicode)0x20) {
+ ++curWord->charLen;
+ ++charPos;
endWord();
return;
}
@@ -568,11 +576,22 @@ void TextPage::addChar(GfxState *state, double x, double y,
n = curWord->len;
if (n > 0 && x1 - curWord->xRight[n-1] >
curWord->font->minSpaceWidth * curWord->fontSize) {
- // large char spacing is sometimes used to move text around
endWord();
beginWord(state, x, y);
}
+ // page rotation and/or transform matrices can cause text to be
+ // drawn in reverse order -- in this case, swap the begin/end
+ // coordinates and break text into individual chars
+ if (w1 < 0) {
+ endWord();
+ beginWord(state, x + dx, y + dy);
+ x1 += w1;
+ y1 += h1;
+ w1 = -w1;
+ h1 = -h1;
+ }
+
// add the characters to the current word
if (uLen != 0) {
w1 /= uLen;
@@ -581,6 +600,8 @@ void TextPage::addChar(GfxState *state, double x, double y,
for (i = 0; i < uLen; ++i) {
curWord->addChar(state, x1 + i*w1, y1 + i*h1, w1, h1, u[i]);
}
+ ++curWord->charLen;
+ ++charPos;
}
void TextPage::endWord() {
@@ -635,14 +656,14 @@ void TextPage::addWord(TextWord *word) {
wordPtr = word;
}
-void TextPage::coalesce() {
- TextWord *word0, *word1, *word2, *word3, *word4;
+void TextPage::coalesce(GBool physLayout) {
+ TextWord *word0, *word1, *word2;
TextLine *line0, *line1, *line2, *line3, *line4, *lineList;
TextBlock *blk0, *blk1, *blk2, *blk3, *blk4, *blk5, *blk6;
TextBlock *yxBlocks, *blocks, *blkStack;
TextFlow *flow0, *flow1;
- double sz, xLimit, minSpace, maxSpace, yLimit;
- double fit1, fit2;
+ double sz, xLimit, yLimit;
+ double fit1, fit2, sp1, sp2;
GBool found;
UnicodeMap *uMap;
GBool isUnicode;
@@ -720,7 +741,8 @@ void TextPage::coalesce() {
word2->xMin < xLimit &&
word2->font == word0->font &&
fabs(word2->fontSize - sz) < 0.05 &&
- fabs(word2->yBase - word0->yBase) < 0.05;
+ fabs(word2->yBase - word0->yBase) < 0.05 &&
+ word2->charPos == word0->charPos + word0->charLen;
} else {
found = gFalse;
for (word1 = word0, word2 = word0->next;
@@ -728,7 +750,8 @@ void TextPage::coalesce() {
word1 = word2, word2 = word2->next) {
if (word2->font == word0->font &&
fabs(word2->fontSize - sz) < 0.05 &&
- fabs(word2->yBase - word0->yBase) < 0.05) {
+ fabs(word2->yBase - word0->yBase) < 0.05 &&
+ word2->charPos == word0->charPos + word0->charLen) {
found = gTrue;
break;
}
@@ -760,84 +783,83 @@ void TextPage::coalesce() {
//----- assemble words into lines
- uMap = globalParams->getTextEncoding();
- isUnicode = uMap ? uMap->isUnicode() : gFalse;
-
- lineList = NULL;
- line0 = NULL;
+ lineList = line0 = NULL;
while (words) {
- // build a new line object
+ // remove the first word from the word list
word0 = words;
words = words->next;
word0->next = NULL;
- line1 = new TextLine();
- line1->words = word0;
- line1->xMin = word0->xMin;
- line1->xMax = word0->xMax;
- line1->yMin = word0->yMin;
- line1->yMax = word0->yMax;
- line1->yBase = word0->yBase;
- line1->font = word0->font;
- line1->fontSize = word0->fontSize;
- line1->len = word0->len;
- minSpace = line1->fontSize * word0->font->minSpaceWidth;
- maxSpace = line1->fontSize * word0->font->maxSpaceWidth;
-
- // find subsequent words in the line
- while (words) {
- xLimit = line1->xMax + maxSpace;
- fit1 = fit2 = 0;
- word3 = word4 = NULL;
- if (rawOrder) {
- if (words &&
- words->xMin < xLimit &&
- ((fit1 = lineFit(line1, word0, words)) >= 0)) {
- word3 = NULL;
- word4 = words;
- }
+
+ // find the best line (if any) for the word
+ if (rawOrder) {
+ if (line0 && lineFit(line0, word0, &sp2) >= 0) {
+ line1 = line0;
+ sp1 = sp2;
} else {
- for (word1 = NULL, word2 = words;
- word2 && word2->xMin < xLimit;
- word1 = word2, word2 = word2->next) {
- fit2 = lineFit(line1, word0, word2);
- if (fit2 >= 0 && (!word4 ||
- (word4 && fit2 < fit1))) {
- fit1 = fit2;
- word3 = word1;
- word4 = word2;
- }
- }
+ line1 = NULL;
+ sp1 = 0;
}
- if (word4) {
- if (word3) {
- word3->next = word4->next;
- } else {
- words = word4->next;
- }
- word0->next = word4;
- word4->next = NULL;
- if (word4->xMax > line1->xMax) {
- line1->xMax = word4->xMax;
- }
- if (word4->yMin < line1->yMin) {
- line1->yMin = word4->yMin;
- }
- if (word4->yMax > line1->yMax) {
- line1->yMax = word4->yMax;
- }
- line1->len += word4->len;
- if (fit1 > minSpace) {
- word0->spaceAfter = gTrue;
- ++line1->len;
+ } else {
+ line1 = NULL;
+ fit1 = 0;
+ sp1 = 0;
+ for (line2 = lineList; line2; line2 = line2->next) {
+ fit2 = lineFit(line2, word0, &sp2);
+ if (fit2 >= 0 && (!line1 || fit2 < fit1)) {
+ line1 = line2;
+ fit1 = fit2;
+ sp1 = sp2;
}
- word0 = word4;
+ }
+ }
+
+ // found a line: append the word
+ if (line1) {
+ word1 = line1->lastWord;
+ word1->next = word0;
+ line1->lastWord = word0;
+ if (word0->xMax > line1->xMax) {
+ line1->xMax = word0->xMax;
+ }
+ if (word0->yMin < line1->yMin) {
+ line1->yMin = word0->yMin;
+ }
+ if (word0->yMax > line1->yMax) {
+ line1->yMax = word0->yMax;
+ }
+ line1->len += word0->len;
+ if (sp1 > line1->fontSize * line1->font->minSpaceWidth) {
+ word1->spaceAfter = gTrue;
+ ++line1->len;
+ }
+
+ // didn't find a line: create a new line
+ } else {
+ line1 = new TextLine();
+ line1->words = line1->lastWord = word0;
+ line1->xMin = word0->xMin;
+ line1->xMax = word0->xMax;
+ line1->yMin = word0->yMin;
+ line1->yMax = word0->yMax;
+ line1->yBase = word0->yBase;
+ line1->font = word0->font;
+ line1->fontSize = word0->fontSize;
+ line1->len = word0->len;
+ if (line0) {
+ line0->next = line1;
} else {
- break;
+ lineList = line1;
}
+ line0 = line1;
}
+ }
+
+ // build the line text
+ uMap = globalParams->getTextEncoding();
+ isUnicode = uMap ? uMap->isUnicode() : gFalse;
- // build the line text
+ for (line1 = lineList; line1; line1 = line1->next) {
line1->text = (Unicode *)gmalloc(line1->len * sizeof(Unicode));
line1->xRight = (double *)gmalloc(line1->len * sizeof(double));
line1->col = (int *)gmalloc(line1->len * sizeof(int));
@@ -871,13 +893,6 @@ void TextPage::coalesce() {
line1->hyphenated = gTrue;
}
- // insert line on list
- if (line0) {
- line0->next = line1;
- } else {
- lineList = line1;
- }
- line0 = line1;
}
if (uMap) {
@@ -932,6 +947,26 @@ void TextPage::coalesce() {
}
}
+#if 0 // for debugging
+ printf("*** lines in xy order, after column assignment ***\n");
+ for (line0 = lineList; line0; line0 = line0->next) {
+ printf("[line: x=%.2f..%.2f y=%.2f..%.2f base=%.2f col=%d len=%d]\n",
+ line0->xMin, line0->xMax, line0->yMin, line0->yMax,
+ line0->yBase, line0->col[0], line0->len);
+ for (word0 = line0->words; word0; word0 = word0->next) {
+ printf(" word: x=%.2f..%.2f y=%.2f..%.2f base=%.2f fontSz=%.2f space=%d: '",
+ word0->xMin, word0->xMax, word0->yMin, word0->yMax,
+ word0->yBase, word0->fontSize, word0->spaceAfter);
+ for (i = 0; i < word0->len; ++i) {
+ fputc(word0->text[i] & 0xff, stdout);
+ }
+ printf("'\n");
+ }
+ }
+ printf("\n");
+ fflush(stdout);
+#endif
+
//----- assemble lines into blocks
if (rawOrder) {
@@ -1181,6 +1216,7 @@ void TextPage::coalesce() {
// +------+ +------+ +-----------+
// | blk4 | | blk6 | ... | blk4+blk6 |
// +------+ +------+ +-----------+
+ yLimit = 0; // make gcc happy
if (blkStack) {
yLimit = blkStack->yMax + blkMaxSpacing * blkStack->lines->fontSize;
}
@@ -1249,8 +1285,10 @@ void TextPage::coalesce() {
blk0 = blk4;
// push the block on the traversal stack
- blk4->stackNext = blkStack;
- blkStack = blk4;
+ if (!physLayout) {
+ blk4->stackNext = blkStack;
+ blkStack = blk4;
+ }
}
}
} // (!rawOrder)
@@ -1456,18 +1494,21 @@ void TextPage::coalesce() {
#endif
}
-// Returns a non-negative number if <word> can be added to <line>
-// (whose last word is <lastWord>). A smaller return value indicates
-// a better fit. If <word> cannot be added to <line> at all, returns
-// a negative number.
-double TextPage::lineFit(TextLine *line, TextWord *lastWord, TextWord *word) {
+// If <word> can be added the end of <line>, return the absolute value
+// of the difference between <line>'s baseline and <word>'s baseline,
+// and set *<space> to the horizontal space between the current last
+// word in <line> and <word>. A smaller return value indicates a
+// better fit. Otherwise, return a negative number.
+double TextPage::lineFit(TextLine *line, TextWord *word, double *space) {
+ TextWord *lastWord;
double fontSize0, fontSize1;
double dx, dxLimit;
+ lastWord = line->lastWord;
fontSize0 = line->fontSize;
fontSize1 = word->fontSize;
dx = word->xMin - lastWord->xMax;
- dxLimit = fontSize0 * line->font->maxSpaceWidth;
+ dxLimit = fontSize0 * lastWord->font->maxSpaceWidth;
// check inter-word spacing
if (dx < fontSize0 * lineMinDeltaX ||
@@ -1475,36 +1516,30 @@ double TextPage::lineFit(TextLine *line, TextWord *lastWord, TextWord *word) {
return -1;
}
- // ensure a non-negative return value
- if (dx < 0) {
- dx = 0;
- }
+ if (
+ // look for adjacent words with close baselines and close font sizes
+ (fabs(line->yBase - word->yBase) < lineMaxBaselineDelta * fontSize0 &&
+ fontSize0 < lineMaxFontSizeRatio * fontSize1 &&
+ fontSize1 < lineMaxFontSizeRatio * fontSize0) ||
- // look for adjacent words with close baselines and close font sizes
- if (fabs(line->yBase - word->yBase) < lineMaxBaselineDelta * fontSize0 &&
- fontSize0 < lineMaxFontSizeRatio * fontSize1 &&
- fontSize1 < lineMaxFontSizeRatio * fontSize0) {
- return dx;
- }
+ // look for a superscript
+ (fontSize1 > lineMinSuperscriptFontSizeRatio * fontSize0 &&
+ fontSize1 < lineMaxSuperscriptFontSizeRatio * fontSize0 &&
+ (word->yMax < lastWord->yMax ||
+ word->yBase < lastWord->yBase) &&
+ word->yMax - lastWord->yMin > lineMinSuperscriptOverlap * fontSize0 &&
+ dx < fontSize0 * lineMaxSuperscriptDeltaX) ||
- // look for a superscript
- if (fontSize1 > lineMinSuperscriptFontSizeRatio * fontSize0 &&
- fontSize1 < lineMaxSuperscriptFontSizeRatio * fontSize0 &&
- (word->yMax < lastWord->yMax ||
- word->yBase < lastWord->yBase) &&
- word->yMax - lastWord->yMin > lineMinSuperscriptOverlap * fontSize0 &&
- dx < fontSize0 * lineMaxSuperscriptDeltaX) {
- return dx;
- }
+ // look for a subscript
+ (fontSize1 > lineMinSubscriptFontSizeRatio * fontSize0 &&
+ fontSize1 < lineMaxSubscriptFontSizeRatio * fontSize0 &&
+ (word->yMin > lastWord->yMin ||
+ word->yBase > lastWord->yBase) &&
+ line->yMax - word->yMin > lineMinSubscriptOverlap * fontSize0 &&
+ dx < fontSize0 * lineMaxSubscriptDeltaX)) {
- // look for a subscript
- if (fontSize1 > lineMinSubscriptFontSizeRatio * fontSize0 &&
- fontSize1 < lineMaxSubscriptFontSizeRatio * fontSize0 &&
- (word->yMin > lastWord->yMin ||
- word->yBase > lastWord->yBase) &&
- line->yMax - word->yMin > lineMinSubscriptOverlap * fontSize0 &&
- dx < fontSize0 * lineMaxSubscriptDeltaX) {
- return dx;
+ *space = dx;
+ return fabs(word->yBase - line->yBase);
}
return -1;
@@ -1737,7 +1772,7 @@ GString *TextPage::getText(double xMin, double yMin,
}
i = 0;
- while (1) {
+ while (i < line->len) {
x0 = (i==0) ? line->xMin : line->xRight[i-1];
x1 = line->xRight[i];
if (0.5 * (x0 + x1) > xMin) {
@@ -1745,6 +1780,9 @@ GString *TextPage::getText(double xMin, double yMin,
}
++i;
}
+ if (i == line->len) {
+ continue;
+ }
col = line->col[i];
if (firstCol < 0 || col < firstCol) {
@@ -1755,9 +1793,8 @@ GString *TextPage::getText(double xMin, double yMin,
// extract the text
col = firstCol;
multiLine = gFalse;
- for (prevLine = NULL, line = lines;
- line;
- prevLine = line, line = line->pageNext) {
+ prevLine = NULL;
+ for (line = lines; line; line = line->pageNext) {
if (line->yMin > yMax) {
break;
}
@@ -1773,7 +1810,7 @@ GString *TextPage::getText(double xMin, double yMin,
}
i = 0;
- while (1) {
+ while (i < line->len) {
x0 = (i==0) ? line->xMin : line->xRight[i-1];
x1 = line->xRight[i];
if (0.5 * (x0 + x1) > xMin) {
@@ -1781,9 +1818,12 @@ GString *TextPage::getText(double xMin, double yMin,
}
++i;
}
+ if (i == line->len) {
+ continue;
+ }
// insert a return
- if (col > line->col[i] ||
+ if (line->col[i] < col ||
(prevLine &&
line->yMin >
prevLine->yMax - lineOverlapSlack * prevLine->fontSize)) {
@@ -1791,6 +1831,7 @@ GString *TextPage::getText(double xMin, double yMin,
col = firstCol;
multiLine = gTrue;
}
+ prevLine = line;
// line this block up with the correct column
for (; col < line->col[i]; ++col) {
@@ -1821,6 +1862,53 @@ GString *TextPage::getText(double xMin, double yMin,
return s;
}
+GBool TextPage::findCharRange(int pos, int length,
+ double *xMin, double *yMin,
+ double *xMax, double *yMax) {
+ TextLine *line;
+ TextWord *word;
+ double x;
+ GBool first;
+ int i;
+
+ //~ this doesn't correctly handle:
+ //~ - ranges split across multiple lines (the highlighted region
+ //~ is the bounding box of all the parts of the range)
+ //~ - cases where characters don't convert one-to-one into Unicode
+ first = gTrue;
+ for (line = lines; line; line = line->pageNext) {
+ for (word = line->words; word; word = word->next) {
+ if (pos < word->charPos + word->charLen &&
+ word->charPos < pos + length) {
+ i = pos - word->charPos;
+ if (i < 0) {
+ i = 0;
+ }
+ x = (i == 0) ? word->xMin : word->xRight[i - 1];
+ if (first || x < *xMin) {
+ *xMin = x;
+ }
+ i = pos + length - word->charPos;
+ if (i >= word->len) {
+ i = word->len - 1;
+ }
+ x = word->xRight[i];
+ if (first || x > *xMax) {
+ *xMax = x;
+ }
+ if (first || word->yMin < *yMin) {
+ *yMin = word->yMin;
+ }
+ if (first || word->yMax > *yMax) {
+ *yMax = word->yMax;
+ }
+ first = gFalse;
+ }
+ }
+ }
+ return !first;
+}
+
void TextPage::dump(void *outputStream, TextOutputFunc outputFunc,
GBool physLayout) {
UnicodeMap *uMap;
@@ -1870,7 +1958,8 @@ void TextPage::dump(void *outputStream, TextOutputFunc outputFunc,
col += line->convertedLen;
// print one or more returns if necessary
- if (!line->pageNext ||
+ if (rawOrder ||
+ !line->pageNext ||
line->pageNext->col[0] < col ||
line->pageNext->yMin >
line->yMax - lineOverlapSlack * line->fontSize) {
@@ -1927,8 +2016,12 @@ void TextPage::dump(void *outputStream, TextOutputFunc outputFunc,
void TextPage::startPage(GfxState *state) {
clear();
- pageWidth = state->getPageWidth();
- pageHeight = state->getPageHeight();
+ if (state) {
+ pageWidth = state->getPageWidth();
+ pageHeight = state->getPageHeight();
+ } else {
+ pageWidth = pageHeight = 0;
+ }
}
void TextPage::clear() {
@@ -1953,6 +2046,7 @@ void TextPage::clear() {
deleteGList(fonts, TextFontInfo);
curWord = NULL;
+ charPos = 0;
font = NULL;
fontSize = 0;
nest = 0;
@@ -1985,6 +2079,10 @@ TextOutputDev::TextOutputDev(char *fileName, GBool physLayoutA,
if (fileName) {
if (!strcmp(fileName, "-")) {
outputStream = stdout;
+#ifdef WIN32
+ // keep DOS from munging the end-of-line characters
+ setmode(fileno(stdout), O_BINARY);
+#endif
} else if ((outputStream = fopen(fileName, append ? "ab" : "wb"))) {
needClose = gTrue;
} else {
@@ -2029,7 +2127,7 @@ void TextOutputDev::startPage(int pageNum, GfxState *state) {
}
void TextOutputDev::endPage() {
- text->coalesce();
+ text->coalesce(physLayout);
if (outputStream) {
text->dump(outputStream, outputFunc, physLayout);
}
@@ -2066,5 +2164,10 @@ GString *TextOutputDev::getText(double xMin, double yMin,
return text->getText(xMin, yMin, xMax, yMax);
}
+GBool TextOutputDev::findCharRange(int pos, int length,
+ double *xMin, double *yMin,
+ double *xMax, double *yMax) {
+ return text->findCharRange(pos, length, xMin, yMin, xMax, yMax);
+}
generated by cgit v0.9.1 at 2024-04-27 19:17:05 (GMT)