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-rw-r--r--src/pdf/qpdfdocument.cpp101
1 files changed, 75 insertions, 26 deletions
diff --git a/src/pdf/qpdfdocument.cpp b/src/pdf/qpdfdocument.cpp
index 6de2fbc6c..17fdb29b9 100644
--- a/src/pdf/qpdfdocument.cpp
+++ b/src/pdf/qpdfdocument.cpp
@@ -446,7 +446,7 @@ void QPdfDocumentPrivate::fpdf_AddSegment(_FX_DOWNLOADHINTS *pThis, size_t offse
Q_UNUSED(size);
}
-QString QPdfDocumentPrivate::getText(FPDF_TEXTPAGE textPage, int startIndex, int count)
+QString QPdfDocumentPrivate::getText(FPDF_TEXTPAGE textPage, int startIndex, int count) const
{
QList<ushort> buf(count + 1);
// TODO is that enough space in case one unicode character is more than one in utf-16?
@@ -455,23 +455,73 @@ QString QPdfDocumentPrivate::getText(FPDF_TEXTPAGE textPage, int startIndex, int
return QString::fromUtf16(reinterpret_cast<const char16_t *>(buf.constData()), len - 1);
}
-QPointF QPdfDocumentPrivate::getCharPosition(FPDF_TEXTPAGE textPage, double pageHeight, int charIndex)
+QPointF QPdfDocumentPrivate::getCharPosition(FPDF_PAGE pdfPage, FPDF_TEXTPAGE textPage, int charIndex) const
{
double x, y;
- int count = FPDFText_CountChars(textPage);
- bool ok = FPDFText_GetCharOrigin(textPage, qMin(count - 1, charIndex), &x, &y);
- if (!ok)
- return QPointF();
- return QPointF(x, pageHeight - y);
+ const int count = FPDFText_CountChars(textPage);
+ if (FPDFText_GetCharOrigin(textPage, qMin(count - 1, charIndex), &x, &y))
+ return mapPageToView(pdfPage, x, y);
+ return {};
}
-QRectF QPdfDocumentPrivate::getCharBox(FPDF_TEXTPAGE textPage, double pageHeight, int charIndex)
+QRectF QPdfDocumentPrivate::getCharBox(FPDF_PAGE pdfPage, FPDF_TEXTPAGE textPage, int charIndex) const
{
double l, t, r, b;
- bool ok = FPDFText_GetCharBox(textPage, charIndex, &l, &r, &b, &t);
- if (!ok)
- return QRectF();
- return QRectF(l, pageHeight - t, r - l, t - b);
+ if (FPDFText_GetCharBox(textPage, charIndex, &l, &r, &b, &t))
+ return mapPageToView(pdfPage, l, t, r, b);
+ return {};
+}
+
+/*! \internal
+ Convert the point \a x , \a y to the usual 1x (pixels = points)
+ 4th-quadrant "view" coordinate system relative to the top-left corner of
+ the rendered page. Some PDF files have internal transforms that make this
+ coordinate system different from "page coordinates", so we cannot just
+ subtract from page height to invert the y coordinates, in general.
+ */
+QPointF QPdfDocumentPrivate::mapPageToView(FPDF_PAGE pdfPage, double x, double y) const
+{
+ const auto pageHeight = FPDF_GetPageHeight(pdfPage);
+ const auto pageWidth = FPDF_GetPageWidth(pdfPage);
+ int rx, ry;
+ if (FPDF_PageToDevice(pdfPage, 0, 0, qRound(pageWidth), qRound(pageHeight), 0, x, y, &rx, &ry))
+ return QPointF(rx, ry);
+ return {};
+}
+
+/*! \internal
+ Convert the bounding box defined by \a left \a top \a right and \a bottom
+ to the usual 1x (pixels = points) 4th-quadrant "view" coordinate system
+ that we use for rendering things on top of the page image.
+ Some PDF files have internal transforms that make this coordinate
+ system different from "page coordinates", so we cannot just
+ subtract from page height to invert the y coordinates, in general.
+ */
+QRectF QPdfDocumentPrivate::mapPageToView(FPDF_PAGE pdfPage, double left, double top, double right, double bottom) const
+{
+ const auto pageHeight = FPDF_GetPageHeight(pdfPage);
+ const auto pageWidth = FPDF_GetPageWidth(pdfPage);
+ int xfmLeft, xfmTop, xfmRight, xfmBottom;
+ if ( FPDF_PageToDevice(pdfPage, 0, 0, qRound(pageWidth), qRound(pageHeight), 0, left, top, &xfmLeft, &xfmTop) &&
+ FPDF_PageToDevice(pdfPage, 0, 0, qRound(pageWidth), qRound(pageHeight), 0, right, bottom, &xfmRight, &xfmBottom) )
+ return QRectF(xfmLeft, xfmTop, xfmRight - xfmLeft, xfmBottom - xfmTop);
+ return {};
+}
+
+/*! \internal
+ Convert the point \a x , \a y \a from the usual 1x (pixels = points)
+ 4th-quadrant "view" coordinate system relative to the top-left corner of
+ the rendered page, to "page coordinates" suited to the given \a pdfPage,
+ which may have arbitrary internal transforms.
+ */
+QPointF QPdfDocumentPrivate::mapViewToPage(FPDF_PAGE pdfPage, QPointF position) const
+{
+ const auto pageHeight = FPDF_GetPageHeight(pdfPage);
+ const auto pageWidth = FPDF_GetPageWidth(pdfPage);
+ double rx, ry;
+ if (FPDF_DeviceToPage(pdfPage, 0, 0, qRound(pageWidth), qRound(pageHeight), 0, position.x(), position.y(), &rx, &ry))
+ return QPointF(rx, ry);
+ return {};
}
QPdfDocumentPrivate::TextPosition QPdfDocumentPrivate::hitTest(int page, QPointF position)
@@ -480,14 +530,14 @@ QPdfDocumentPrivate::TextPosition QPdfDocumentPrivate::hitTest(int page, QPointF
TextPosition result;
FPDF_PAGE pdfPage = FPDF_LoadPage(doc, page);
- double pageHeight = FPDF_GetPageHeight(pdfPage);
FPDF_TEXTPAGE textPage = FPDFText_LoadPage(pdfPage);
- int hitIndex = FPDFText_GetCharIndexAtPos(textPage, position.x(), pageHeight - position.y(),
+ const QPointF pagePos = mapViewToPage(pdfPage, position);
+ int hitIndex = FPDFText_GetCharIndexAtPos(textPage, pagePos.x(), pagePos.y(),
CharacterHitTolerance, CharacterHitTolerance);
if (hitIndex >= 0) {
- QPointF charPos = getCharPosition(textPage, pageHeight, hitIndex);
+ QPointF charPos = getCharPosition(pdfPage, textPage, hitIndex);
if (!charPos.isNull()) {
- QRectF charBox = getCharBox(textPage, pageHeight, hitIndex);
+ QRectF charBox = getCharBox(pdfPage, textPage, hitIndex);
// If the given position is past the end of the line, i.e. if the right edge of the found character's
// bounding box is closer to it than the left edge is, we say that we "hit" the next character index after
if (qAbs(charBox.right() - position.x()) < qAbs(charPos.x() - position.x())) {
@@ -931,11 +981,12 @@ QPdfSelection QPdfDocument::getSelection(int page, QPointF start, QPointF end)
{
const QPdfMutexLocker lock;
FPDF_PAGE pdfPage = FPDF_LoadPage(d->doc, page);
- double pageHeight = FPDF_GetPageHeight(pdfPage);
+ const QPointF pageStart = d->mapViewToPage(pdfPage, start);
+ const QPointF pageEnd = d->mapViewToPage(pdfPage, end);
FPDF_TEXTPAGE textPage = FPDFText_LoadPage(pdfPage);
- int startIndex = FPDFText_GetCharIndexAtPos(textPage, start.x(), pageHeight - start.y(),
+ int startIndex = FPDFText_GetCharIndexAtPos(textPage, pageStart.x(), pageStart.y(),
CharacterHitTolerance, CharacterHitTolerance);
- int endIndex = FPDFText_GetCharIndexAtPos(textPage, end.x(), pageHeight - end.y(),
+ int endIndex = FPDFText_GetCharIndexAtPos(textPage, pageEnd.x(), pageEnd.y(),
CharacterHitTolerance, CharacterHitTolerance);
QPdfSelection result;
@@ -946,7 +997,7 @@ QPdfSelection QPdfDocument::getSelection(int page, QPointF start, QPointF end)
// If the given end position is past the end of the line, i.e. if the right edge of the last character's
// bounding box is closer to it than the left edge is, then extend the char range by one
- QRectF endCharBox = d->getCharBox(textPage, pageHeight, endIndex);
+ QRectF endCharBox = d->getCharBox(pdfPage, textPage, endIndex);
if (qAbs(endCharBox.right() - end.x()) < qAbs(endCharBox.x() - end.x()))
++endIndex;
@@ -958,7 +1009,7 @@ QPdfSelection QPdfDocument::getSelection(int page, QPointF start, QPointF end)
for (int i = 0; i < rectCount; ++i) {
double l, r, b, t;
FPDFText_GetRect(textPage, i, &l, &t, &r, &b);
- QRectF rect(l, pageHeight - t, r - l, t - b);
+ const QRectF rect = d->mapPageToView(pdfPage, l, t, r, b);
if (hull.isNull())
hull = rect;
else
@@ -988,7 +1039,6 @@ QPdfSelection QPdfDocument::getSelectionAtIndex(int page, int startIndex, int ma
return {};
const QPdfMutexLocker lock;
FPDF_PAGE pdfPage = FPDF_LoadPage(d->doc, page);
- double pageHeight = FPDF_GetPageHeight(pdfPage);
FPDF_TEXTPAGE textPage = FPDFText_LoadPage(pdfPage);
int pageCount = FPDFText_CountChars(textPage);
if (startIndex >= pageCount)
@@ -1003,7 +1053,7 @@ QPdfSelection QPdfDocument::getSelectionAtIndex(int page, int startIndex, int ma
for (int i = 0; i < rectCount; ++i) {
double l, r, b, t;
FPDFText_GetRect(textPage, i, &l, &t, &r, &b);
- QRectF rect(l, pageHeight - t, r - l, t - b);
+ const QRectF rect = d->mapPageToView(pdfPage, l, t, r, b);
if (hull.isNull())
hull = rect;
else
@@ -1012,7 +1062,7 @@ QPdfSelection QPdfDocument::getSelectionAtIndex(int page, int startIndex, int ma
}
}
if (bounds.isEmpty())
- hull = QRectF(d->getCharPosition(textPage, pageHeight, startIndex), QSizeF());
+ hull = QRectF(d->getCharPosition(pdfPage, textPage, startIndex), QSizeF());
qCDebug(qLcDoc) << "on page" << page << "at index" << startIndex << "maxLength" << maxLength
<< "got" << text.size() << "chars," << rectCount << "rects within" << hull;
@@ -1029,7 +1079,6 @@ QPdfSelection QPdfDocument::getAllText(int page)
{
const QPdfMutexLocker lock;
FPDF_PAGE pdfPage = FPDF_LoadPage(d->doc, page);
- double pageHeight = FPDF_GetPageHeight(pdfPage);
FPDF_TEXTPAGE textPage = FPDFText_LoadPage(pdfPage);
int count = FPDFText_CountChars(textPage);
if (count < 1)
@@ -1041,7 +1090,7 @@ QPdfSelection QPdfDocument::getAllText(int page)
for (int i = 0; i < rectCount; ++i) {
double l, r, b, t;
FPDFText_GetRect(textPage, i, &l, &t, &r, &b);
- QRectF rect(l, pageHeight - t, r - l, t - b);
+ const QRectF rect = d->mapPageToView(pdfPage, l, t, r, b);
if (hull.isNull())
hull = rect;
else
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-09 22:50:11 +0000