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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
commite5fcad302d86d316390c6b0f62759a067313e8a9 (patch)
treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /src/gui/painting/qregion_win.cpp
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Long live Qt 4.5!
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diff --git a/src/gui/painting/qregion_win.cpp b/src/gui/painting/qregion_win.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qbitmap.h"
+#include "qbuffer.h"
+#include "qimage.h"
+#include "qpolygon.h"
+#include "qregion.h"
+#include "qt_windows.h"
+
+QT_BEGIN_NAMESPACE
+
+
+/*
+ In Windows versions before Windows Vista CreateRectRgn - when called in a multi-threaded
+ environment - might return an invalid handle. This function works around this limitation
+ by verifying the handle with a quick GetRegionData() call and re-creates the region
+ if necessary.
+*/
+HRGN qt_tryCreateRegion(QRegion::RegionType type, int left, int top, int right, int bottom)
+{
+ const int tries = 10;
+ for (int i = 0; i < tries; ++i) {
+ HRGN region;
+ switch (type) {
+ case QRegion::Rectangle:
+ region = CreateRectRgn(left, top, right, bottom);
+ break;
+ case QRegion::Ellipse:
+#ifndef Q_OS_WINCE
+ region = CreateEllipticRgn(left, top, right, bottom);
+#endif
+ break;
+ }
+ if (region) {
+ if (GetRegionData(region, 0, 0))
+ return region;
+ else
+ DeleteObject(region);
+ }
+ }
+ return 0;
+}
+
+#ifndef Q_OS_WINCE
+HRGN qt_tryCreatePolygonRegion(const QPolygon &a, Qt::FillRule fillRule)
+{
+ const int tries = 10;
+ for (int i = 0; i < tries; ++i) {
+ HRGN region = CreatePolygonRgn(reinterpret_cast<const POINT*>(a.data()), a.size(),
+ fillRule == Qt::OddEvenFill ? ALTERNATE : WINDING);
+ if (region) {
+ if (GetRegionData(region, 0, 0))
+ return region;
+ else
+ DeleteObject(region);
+ }
+ }
+ return 0;
+}
+#endif
+
+QRegion::QRegionData QRegion::shared_empty = { Q_BASIC_ATOMIC_INITIALIZER(1), 0 };
+
+QRegion::QRegion()
+ : d(&shared_empty)
+{
+ d->ref.ref();
+}
+
+#ifndef Q_OS_WINCE //implementation for WindowsCE in qregion_wce.cpp
+QRegion::QRegion(const QRect &r, RegionType t)
+{
+ if (r.isEmpty()) {
+ d = &shared_empty;
+ d->ref.ref();
+ } else {
+ d = new QRegionData;
+ d->ref = 1;
+ if (t == Rectangle)
+ d->rgn = qt_tryCreateRegion(t, r.left(), r.top(), r.x() + r.width(), r.y() + r.height());
+ else if (t == Ellipse) {
+ // need to add 1 to width/height for the ellipse to have correct boundingrect.
+ d->rgn = qt_tryCreateRegion(t, r.x(), r.y(), r.x() + r.width() + 1, r.y() + r.height() + 1);
+ }
+ }
+}
+#endif
+
+#ifndef Q_OS_WINCE //implementation for WindowsCE in qregion_wce.cpp
+QRegion::QRegion(const QPolygon &a, Qt::FillRule fillRule)
+{
+ if (a.size() < 3) {
+ d = &shared_empty;
+ d->ref.ref();
+ } else {
+ d = new QRegionData;
+ d->ref = 1;
+ d->rgn = qt_tryCreatePolygonRegion(a, fillRule);
+ }
+}
+#endif
+
+QRegion::QRegion(const QRegion &r)
+{
+ d = r.d;
+ d->ref.ref();
+}
+
+HRGN qt_win_bitmapToRegion(const QBitmap& bitmap)
+{
+ HRGN region=0;
+ QImage image = bitmap.toImage();
+ const int MAXRECT = 256;
+ struct RData {
+ RGNDATAHEADER header;
+ RECT rect[MAXRECT];
+ };
+ RData data;
+
+#define FlushSpans \
+ { \
+ data.header.dwSize = sizeof(RGNDATAHEADER); \
+ data.header.iType = RDH_RECTANGLES; \
+ data.header.nCount = n; \
+ data.header.nRgnSize = 0; \
+ data.header.rcBound.bottom = y; \
+ HRGN r = ExtCreateRegion(0, \
+ sizeof(RGNDATAHEADER)+n*sizeof(RECT),(RGNDATA*)&data); \
+ if (region) { \
+ CombineRgn(region, region, r, RGN_OR); \
+ DeleteObject(r); \
+ } else { \
+ region = r; \
+ } \
+ data.header.rcBound.top = y; \
+ }
+
+#define AddSpan \
+ { \
+ data.rect[n].left=prev1; \
+ data.rect[n].top=y; \
+ data.rect[n].right=x-1+1; \
+ data.rect[n].bottom=y+1; \
+ n++; \
+ if (n == MAXRECT) { \
+ FlushSpans \
+ n=0; \
+ } \
+ }
+
+ data.header.rcBound.top = 0;
+ data.header.rcBound.left = 0;
+ data.header.rcBound.right = image.width()-1;
+ int n = 0;
+
+ int zero = 0x00;
+
+ int x, y;
+ for (y = 0; y < image.height(); ++y) {
+ uchar *line = image.scanLine(y);
+ int w = image.width();
+ uchar all=zero;
+ int prev1 = -1;
+ for (x = 0; x < w;) {
+ uchar byte = line[x/8];
+ if (x > w - 8 || byte != all) {
+ for (int b = 8; b > 0 && x < w; --b) {
+ if (!(byte & 0x01) == !all) {
+ // More of the same
+ } else {
+ // A change.
+ if (all != zero) {
+ AddSpan;
+ all = zero;
+ } else {
+ prev1 = x;
+ all = ~zero;
+ }
+ }
+ byte >>= 1;
+ ++x;
+ }
+ } else {
+ x += 8;
+ }
+ }
+ if (all != zero) {
+ AddSpan;
+ }
+ }
+ if (n) {
+ FlushSpans;
+ }
+
+ if (!region) {
+ // Surely there is some better way.
+ region = qt_tryCreateRegion(QRegion::Rectangle, 0,0,1,1);
+ CombineRgn(region, region, region, RGN_XOR);
+ }
+ return region;
+}
+
+#ifndef Q_OS_WINCE //implementation for WindowsCE in qregion_wce.cpp
+QRegion::QRegion(const QBitmap &bm)
+{
+ if (bm.isNull()) {
+ d = &shared_empty;
+ d->ref.ref();
+ } else {
+ d = new QRegionData;
+ d->ref = 1;
+ d->rgn = qt_win_bitmapToRegion(bm);
+ }
+}
+#endif
+
+void QRegion::cleanUp(QRegion::QRegionData *x)
+{
+ if (x->rgn)
+ DeleteObject(x->rgn);
+ delete x;
+}
+
+QRegion::~QRegion()
+{
+ if (!d->ref.deref())
+ cleanUp(d);
+}
+
+QRegion &QRegion::operator=(const QRegion &r)
+{
+ r.d->ref.ref();
+ if (!d->ref.deref())
+ cleanUp(d);
+ d = r.d;
+ return *this;
+}
+
+
+QRegion QRegion::copy() const
+{
+ QRegion r;
+ QRegionData *x = new QRegionData;
+ x->ref = 1;
+ if (d->rgn) {
+ x->rgn = qt_tryCreateRegion(QRegion::Rectangle, 0, 0, 2, 2);
+ CombineRgn(x->rgn, d->rgn, 0, RGN_COPY);
+ } else {
+ x->rgn = 0;
+ }
+ if (!r.d->ref.deref())
+ cleanUp(r.d);
+ r.d = x;
+ return r;
+}
+
+bool QRegion::isEmpty() const
+{
+ return (d == &shared_empty || boundingRect().isEmpty());
+}
+
+
+bool QRegion::contains(const QPoint &p) const
+{
+ return d->rgn ? PtInRegion(d->rgn, p.x(), p.y()) : false;
+}
+
+bool QRegion::contains(const QRect &r) const
+{
+ if (!d->rgn)
+ return false;
+ RECT rect;
+ SetRect(&rect, r.left(), r.top(), r.right(), r.bottom());
+ return RectInRegion(d->rgn, &rect);
+}
+
+
+void QRegion::translate(int dx, int dy)
+{
+ if (!d->rgn || (dx == 0 && dy == 0))
+ return;
+ detach();
+ OffsetRgn(d->rgn, dx, dy);
+}
+
+
+#define RGN_NOP -1
+
+// Duplicates of those in qregion.cpp
+#define QRGN_OR 6
+#define QRGN_AND 7
+#define QRGN_SUB 8
+#define QRGN_XOR 9
+
+/*
+ Performs the actual OR, AND, SUB and XOR operation between regions.
+ Sets the resulting region handle to 0 to indicate an empty region.
+*/
+
+QRegion QRegion::winCombine(const QRegion &r, int op) const
+{
+ int both=RGN_NOP,
+ left=RGN_NOP,
+ right=RGN_NOP;
+ switch (op) {
+ case QRGN_OR:
+ both = RGN_OR;
+ left = right = RGN_COPY;
+ break;
+ case QRGN_AND:
+ both = RGN_AND;
+ break;
+ case QRGN_SUB:
+ both = RGN_DIFF;
+ left = RGN_COPY;
+ break;
+ case QRGN_XOR:
+ both = RGN_XOR;
+ left = right = RGN_COPY;
+ break;
+ default:
+ qWarning("QRegion: Internal error in winCombine");
+ }
+
+ int allCombineRgnResults = NULLREGION;
+ QRegion result;
+ result.detach();
+ result.d->rgn = qt_tryCreateRegion(QRegion::Rectangle, 0, 0, 0, 0);
+ if (d->rgn && r.d->rgn)
+ allCombineRgnResults = CombineRgn(result.d->rgn, d->rgn, r.d->rgn, both);
+ else if (d->rgn && left != RGN_NOP)
+ allCombineRgnResults = CombineRgn(result.d->rgn, d->rgn, d->rgn, left);
+ else if (r.d->rgn && right != RGN_NOP)
+ allCombineRgnResults = CombineRgn(result.d->rgn, r.d->rgn, r.d->rgn, right);
+
+ if (allCombineRgnResults == NULLREGION || allCombineRgnResults == ERROR)
+ result = QRegion();
+
+ //##### do not delete this. A null pointer is different from an empty region in SelectClipRgn in qpainter_win! (M)
+// if (allCombineRgnResults == NULLREGION) {
+// if (result.data->rgn)
+// DeleteObject(result.data->rgn);
+// result.data->rgn = 0; // empty region
+// }
+ return result;
+}
+
+QRegion QRegion::unite(const QRegion &r) const
+{
+ if (!d->rgn)
+ return r;
+ if (!r.d->rgn)
+ return *this;
+ return winCombine(r, QRGN_OR);
+}
+
+QRegion QRegion::unite(const QRect &r) const
+{
+ return unite(QRegion(r));
+}
+
+QRegion QRegion::intersect(const QRegion &r) const
+{
+ if (!r.d->rgn || !d->rgn)
+ return QRegion();
+ return winCombine(r, QRGN_AND);
+}
+
+QRegion QRegion::subtract(const QRegion &r) const
+{
+ if (!r.d->rgn || !d->rgn)
+ return *this;
+ return winCombine(r, QRGN_SUB);
+}
+
+QRegion QRegion::eor(const QRegion &r) const
+{
+ if (!d->rgn)
+ return r;
+ if (!r.d->rgn)
+ return *this;
+ return winCombine(r, QRGN_XOR);
+}
+
+
+QRect QRegion::boundingRect() const
+{
+ if (!d->rgn)
+ return QRect();
+ RECT r;
+ if (GetRgnBox(d->rgn, &r) == NULLREGION)
+ return QRect();
+ else
+ return QRect(r.left, r.top, r.right - r.left, r.bottom - r.top);
+}
+
+QVector<QRect> QRegion::rects() const
+{
+ if (d->rgn == 0)
+ return QVector<QRect>();
+
+ int numBytes = GetRegionData(d->rgn, 0, 0);
+ if (numBytes == 0)
+ return QVector<QRect>();
+
+ char *buf = new char[numBytes];
+ if (buf == 0)
+ return QVector<QRect>();
+
+ RGNDATA *rd = reinterpret_cast<RGNDATA*>(buf);
+ if (GetRegionData(d->rgn, numBytes, rd) == 0) {
+ delete [] buf;
+ return QVector<QRect>();
+ }
+
+ QVector<QRect> a(rd->rdh.nCount);
+ RECT *r = reinterpret_cast<RECT*>(rd->Buffer);
+ for (int i = 0; i < a.size(); ++i) {
+ a[i].setCoords(r->left, r->top, r->right - 1, r->bottom - 1);
+ ++r;
+ }
+
+ delete [] buf;
+ return a;
+}
+
+void QRegion::setRects(const QRect *rects, int num)
+{
+ *this = QRegion();
+ if (!rects || num == 0 || (num == 1 && rects->isEmpty()))
+ return;
+ for (int i = 0; i < num; ++i)
+ *this |= rects[i];
+}
+
+int QRegion::numRects() const
+{
+ if (d->rgn == 0)
+ return 0;
+
+ const int numBytes = GetRegionData(d->rgn, 0, 0);
+ if (numBytes == 0)
+ return 0;
+
+ char *buf = new char[numBytes];
+ if (buf == 0)
+ return 0;
+
+ RGNDATA *rd = reinterpret_cast<RGNDATA*>(buf);
+ if (GetRegionData(d->rgn, numBytes, rd) == 0) {
+ delete[] buf;
+ return 0;
+ }
+
+ const int n = rd->rdh.nCount;
+ delete[] buf;
+
+ return n;
+}
+
+bool QRegion::operator==(const QRegion &r) const
+{
+ if (d == r.d)
+ return true;
+ if ((d->rgn == 0) ^ (r.d->rgn == 0)) // one is empty, not both
+ return false;
+ return d->rgn == 0 ? true // both empty
+ : EqualRgn(d->rgn, r.d->rgn); // both non-empty
+}
+
+QRegion& QRegion::operator+=(const QRegion &r)
+{
+ if (!r.d->rgn)
+ return *this;
+
+ if (!d->rgn) {
+ *this = r;
+ return *this;
+ }
+
+ detach();
+
+ int result;
+ result = CombineRgn(d->rgn, d->rgn, r.d->rgn, RGN_OR);
+ if (result == NULLREGION || result == ERROR)
+ *this = QRegion();
+
+ return *this;
+}
+
+QRegion& QRegion::operator-=(const QRegion &r)
+{
+ if (!r.d->rgn || !d->rgn)
+ return *this;
+
+ detach();
+
+ int result;
+ result = CombineRgn(d->rgn, d->rgn, r.d->rgn, RGN_DIFF);
+ if (result == NULLREGION || result == ERROR)
+ *this = QRegion();
+
+ return *this;
+}
+
+QRegion& QRegion::operator&=(const QRegion &r)
+{
+ if (!d->rgn)
+ return *this;
+
+ if (!r.d->rgn) {
+ *this = QRegion();
+ return *this;
+ }
+
+ detach();
+
+ int result;
+ result = CombineRgn(d->rgn, d->rgn, r.d->rgn, RGN_AND);
+ if (result == NULLREGION || result == ERROR)
+ *this = QRegion();
+
+ return *this;
+}
+
+bool qt_region_strictContains(const QRegion &region, const QRect &rect)
+{
+ Q_UNUSED(region);
+ Q_UNUSED(rect);
+ return false;
+}
+
+void QRegion::ensureHandle() const
+{
+}
+
+QT_END_NAMESPACE