Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 635 insertions, 0 deletions

diff --git a/src/gui/text/qfontenginedirectwrite.cpp b/src/gui/text/qfontenginedirectwrite.cpp
new file mode 100644
index 0000000000..f0a3644865
--- /dev/null
+++ b/src/gui/text/qfontenginedirectwrite.cpp
@@ -0,0 +1,635 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT_NO_DIRECTWRITE
+
+#include "qfontenginedirectwrite_p.h"
+
+#include <qendian.h>
+#include <dwrite.h>
+#include <private/qnativeimage_p.h>
+
+#include <d2d1.h>
+
+QT_BEGIN_NAMESPACE
+
+// Convert from design units to logical pixels
+#define DESIGN_TO_LOGICAL(DESIGN_UNIT_VALUE) \
+    QFixed::fromReal((qreal(DESIGN_UNIT_VALUE) / qreal(m_unitsPerEm)) * fontDef.pixelSize)
+
+namespace {
+
+    class GeometrySink: public IDWriteGeometrySink
+    {
+    public:
+        GeometrySink(QPainterPath *path) : m_path(path), m_refCount(0)
+        {
+            Q_ASSERT(m_path != 0);
+        }
+
+        IFACEMETHOD_(void, AddBeziers)(const D2D1_BEZIER_SEGMENT *beziers, UINT bezierCount);
+        IFACEMETHOD_(void, AddLines)(const D2D1_POINT_2F *points, UINT pointCount);
+        IFACEMETHOD_(void, BeginFigure)(D2D1_POINT_2F startPoint, D2D1_FIGURE_BEGIN figureBegin);
+        IFACEMETHOD(Close)();
+        IFACEMETHOD_(void, EndFigure)(D2D1_FIGURE_END figureEnd);
+        IFACEMETHOD_(void, SetFillMode)(D2D1_FILL_MODE fillMode);
+        IFACEMETHOD_(void, SetSegmentFlags)(D2D1_PATH_SEGMENT vertexFlags);
+
+        IFACEMETHOD_(unsigned long, AddRef)();
+        IFACEMETHOD_(unsigned long, Release)();
+        IFACEMETHOD(QueryInterface)(IID const &riid, void **ppvObject);
+
+    private:
+        inline static QPointF fromD2D1_POINT_2F(const D2D1_POINT_2F &inp)
+        {
+            return QPointF(inp.x, inp.y);
+        }
+
+        unsigned long m_refCount;
+        QPointF m_startPoint;
+        QPainterPath *m_path;
+    };
+
+    void GeometrySink::AddBeziers(const D2D1_BEZIER_SEGMENT *beziers,
+                                  UINT bezierCount)
+    {
+        for (uint i=0; i<bezierCount; ++i) {
+            QPointF c1 = fromD2D1_POINT_2F(beziers[i].point1);
+            QPointF c2 = fromD2D1_POINT_2F(beziers[i].point2);
+            QPointF p2 = fromD2D1_POINT_2F(beziers[i].point3);
+
+            m_path->cubicTo(c1, c2, p2);
+        }
+    }
+
+    void GeometrySink::AddLines(const D2D1_POINT_2F *points, UINT pointsCount)
+    {
+        for (uint i=0; i<pointsCount; ++i)
+            m_path->lineTo(fromD2D1_POINT_2F(points[i]));
+    }
+
+    void GeometrySink::BeginFigure(D2D1_POINT_2F startPoint,
+                                   D2D1_FIGURE_BEGIN /*figureBegin*/)
+    {
+        m_startPoint = fromD2D1_POINT_2F(startPoint);
+        m_path->moveTo(m_startPoint);
+    }
+
+    IFACEMETHODIMP GeometrySink::Close()
+    {
+        return E_NOTIMPL;
+    }
+
+    void GeometrySink::EndFigure(D2D1_FIGURE_END figureEnd)
+    {
+        if (figureEnd == D2D1_FIGURE_END_CLOSED)
+            m_path->closeSubpath();
+    }
+
+    void GeometrySink::SetFillMode(D2D1_FILL_MODE fillMode)
+    {
+        m_path->setFillRule(fillMode == D2D1_FILL_MODE_ALTERNATE
+                            ? Qt::OddEvenFill
+                            : Qt::WindingFill);
+    }
+
+    void GeometrySink::SetSegmentFlags(D2D1_PATH_SEGMENT /*vertexFlags*/)
+    {
+        /* Not implemented */
+    }
+
+    IFACEMETHODIMP_(unsigned long) GeometrySink::AddRef()
+    {
+        return InterlockedIncrement(&m_refCount);
+    }
+
+    IFACEMETHODIMP_(unsigned long) GeometrySink::Release()
+    {
+        unsigned long newCount = InterlockedDecrement(&m_refCount);
+        if (newCount == 0)
+        {
+            delete this;
+            return 0;
+        }
+
+        return newCount;
+    }
+
+    IFACEMETHODIMP GeometrySink::QueryInterface(IID const &riid, void **ppvObject)
+    {
+        if (__uuidof(IDWriteGeometrySink) == riid) {
+            *ppvObject = this;
+        } else if (__uuidof(IUnknown) == riid) {
+            *ppvObject = this;
+        } else {
+            *ppvObject = NULL;
+            return E_FAIL;
+        }
+
+        AddRef();
+        return S_OK;
+    }
+
+}
+
+QFontEngineDirectWrite::QFontEngineDirectWrite(IDWriteFactory *directWriteFactory,
+                                               IDWriteFontFace *directWriteFontFace,
+                                               qreal pixelSize)
+    : m_directWriteFontFace(directWriteFontFace)
+    , m_directWriteFactory(directWriteFactory)
+    , m_directWriteBitmapRenderTarget(0)
+    , m_lineThickness(-1)
+    , m_unitsPerEm(-1)
+    , m_ascent(-1)
+    , m_descent(-1)
+    , m_xHeight(-1)
+    , m_lineGap(-1)
+{
+    m_directWriteFactory->AddRef();
+    m_directWriteFontFace->AddRef();
+
+    fontDef.pixelSize = pixelSize;
+    collectMetrics();
+}
+
+QFontEngineDirectWrite::~QFontEngineDirectWrite()
+{
+    m_directWriteFactory->Release();
+    m_directWriteFontFace->Release();
+
+    if (m_directWriteBitmapRenderTarget != 0)
+        m_directWriteBitmapRenderTarget->Release();
+}
+
+void QFontEngineDirectWrite::collectMetrics()
+{
+    if (m_directWriteFontFace != 0) {
+        DWRITE_FONT_METRICS metrics;
+
+        m_directWriteFontFace->GetMetrics(&metrics);
+        m_unitsPerEm = metrics.designUnitsPerEm;
+
+        m_lineThickness = DESIGN_TO_LOGICAL(metrics.underlineThickness);
+        m_ascent = DESIGN_TO_LOGICAL(metrics.ascent);
+        m_descent = DESIGN_TO_LOGICAL(metrics.descent);
+        m_xHeight = DESIGN_TO_LOGICAL(metrics.xHeight);
+        m_lineGap = DESIGN_TO_LOGICAL(metrics.lineGap);
+    }
+}
+
+QFixed QFontEngineDirectWrite::lineThickness() const
+{
+    if (m_lineThickness > 0)
+        return m_lineThickness;
+    else
+        return QFontEngine::lineThickness();
+}
+
+bool QFontEngineDirectWrite::getSfntTableData(uint tag, uchar *buffer, uint *length) const
+{
+    if (m_directWriteFontFace) {
+        DWORD t = qbswap<quint32>(tag);
+
+        const void *tableData = 0;
+        void *tableContext = 0;
+        UINT32 tableSize;
+        BOOL exists;
+        HRESULT hr = m_directWriteFontFace->TryGetFontTable(
+                    t, &tableData, &tableSize, &tableContext, &exists
+                    );
+
+        if (SUCCEEDED(hr)) {
+            if (!exists)
+                return false;
+
+            if (buffer == 0) {
+                *length = tableSize;
+                return true;
+            } else if (*length < tableSize) {
+                return false;
+            }
+
+            qMemCopy(buffer, tableData, tableSize);
+            m_directWriteFontFace->ReleaseFontTable(tableContext);
+
+            return true;
+        } else {
+            qErrnoWarning("QFontEngineDirectWrite::getSfntTableData: TryGetFontTable failed");
+        }
+    }
+
+    return false;
+}
+
+QFixed QFontEngineDirectWrite::emSquareSize() const
+{
+    if (m_unitsPerEm > 0)
+        return m_unitsPerEm;
+    else
+        return QFontEngine::emSquareSize();
+}
+
+inline unsigned int getChar(const QChar *str, int &i, const int len)
+{
+    unsigned int uc = str[i].unicode();
+    if (uc >= 0xd800 && uc < 0xdc00 && i < len-1) {
+        uint low = str[i+1].unicode();
+       if (low >= 0xdc00 && low < 0xe000) {
+            uc = (uc - 0xd800)*0x400 + (low - 0xdc00) + 0x10000;
+            ++i;
+        }
+    }
+    return uc;
+}
+
+bool QFontEngineDirectWrite::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs,
+                                          int *nglyphs, QTextEngine::ShaperFlags flags) const
+{
+    if (m_directWriteFontFace != 0) {
+        QVarLengthArray<UINT32> codePoints(len);
+        for (int i=0; i<len; ++i) {
+            codePoints[i] = getChar(str, i, len);
+            if (flags & QTextEngine::RightToLeft)
+                codePoints[i] = QChar::mirroredChar(codePoints[i]);
+        }
+
+        QVarLengthArray<UINT16> glyphIndices(len);
+        HRESULT hr = m_directWriteFontFace->GetGlyphIndicesW(codePoints.data(),
+                                                             len,
+                                                             glyphIndices.data());
+
+        if (SUCCEEDED(hr)) {
+            for (int i=0; i<len; ++i)
+                glyphs->glyphs[i] = glyphIndices[i];
+
+            *nglyphs = len;
+
+            if (!(flags & QTextEngine::GlyphIndicesOnly))
+                recalcAdvances(glyphs, 0);
+
+            return true;
+        } else {
+            qErrnoWarning("QFontEngineDirectWrite::stringToCMap: GetGlyphIndicesW failed");
+        }
+    }
+
+    return false;
+}
+
+void QFontEngineDirectWrite::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags) const
+{
+    if (m_directWriteFontFace == 0)
+        return;
+
+    QVarLengthArray<UINT16> glyphIndices(glyphs->numGlyphs);
+
+    // ### Caching?
+    for(int i=0; i<glyphs->numGlyphs; i++)
+        glyphIndices[i] = UINT16(glyphs->glyphs[i]);
+
+    QVarLengthArray<DWRITE_GLYPH_METRICS> glyphMetrics(glyphIndices.size());
+    HRESULT hr = m_directWriteFontFace->GetDesignGlyphMetrics(glyphIndices.data(),
+                                                              glyphIndices.size(),
+                                                              glyphMetrics.data());
+    if (SUCCEEDED(hr)) {
+        for (int i=0; i<glyphs->numGlyphs; ++i) {
+            glyphs->advances_x[i] = DESIGN_TO_LOGICAL(glyphMetrics[i].advanceWidth);
+            if (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
+                glyphs->advances_x[i] = glyphs->advances_x[i].round();
+            glyphs->advances_y[i] = 0;
+        }
+    } else {
+        qErrnoWarning("QFontEngineDirectWrite::recalcAdvances: GetDesignGlyphMetrics failed");
+    }
+}
+
+void QFontEngineDirectWrite::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs,
+                                             QPainterPath *path, QTextItem::RenderFlags flags)
+{
+    if (m_directWriteFontFace == 0)
+        return;
+
+    QVarLengthArray<UINT16> glyphIndices(nglyphs);
+    QVarLengthArray<DWRITE_GLYPH_OFFSET> glyphOffsets(nglyphs);
+    QVarLengthArray<FLOAT> glyphAdvances(nglyphs);
+
+    for (int i=0; i<nglyphs; ++i) {
+        glyphIndices[i] = glyphs[i];
+        glyphOffsets[i].advanceOffset  = positions[i].x.toReal();
+        glyphOffsets[i].ascenderOffset = -positions[i].y.toReal();
+        glyphAdvances[i] = 0.0;
+    }
+
+    GeometrySink geometrySink(path);
+    HRESULT hr = m_directWriteFontFace->GetGlyphRunOutline(
+                fontDef.pixelSize,
+                glyphIndices.data(),
+                glyphAdvances.data(),
+                glyphOffsets.data(),
+                nglyphs,
+                false,
+                flags & QTextItem::RightToLeft,
+                &geometrySink
+                );
+
+    if (FAILED(hr))
+        qErrnoWarning("QFontEngineDirectWrite::addGlyphsToPath: GetGlyphRunOutline failed");
+}
+
+glyph_metrics_t QFontEngineDirectWrite::boundingBox(const QGlyphLayout &glyphs)
+{
+    if (glyphs.numGlyphs == 0)
+        return glyph_metrics_t();
+
+    bool round = fontDef.styleStrategy & QFont::ForceIntegerMetrics;
+
+    QFixed w = 0;
+    for (int i = 0; i < glyphs.numGlyphs; ++i) {
+        w += round ? glyphs.effectiveAdvance(i).round() : glyphs.effectiveAdvance(i);
+
+    }
+
+    return glyph_metrics_t(0, -m_ascent, w - lastRightBearing(glyphs), m_ascent + m_descent, w, 0);
+}
+
+glyph_metrics_t QFontEngineDirectWrite::boundingBox(glyph_t g)
+{
+    if (m_directWriteFontFace == 0)
+        return glyph_metrics_t();
+
+    UINT16 glyphIndex = g;
+
+    DWRITE_GLYPH_METRICS glyphMetrics;
+    HRESULT hr = m_directWriteFontFace->GetDesignGlyphMetrics(&glyphIndex, 1, &glyphMetrics);
+    if (SUCCEEDED(hr)) {
+        QFixed advanceWidth = DESIGN_TO_LOGICAL(glyphMetrics.advanceWidth);
+        QFixed leftSideBearing = DESIGN_TO_LOGICAL(glyphMetrics.leftSideBearing);
+        QFixed rightSideBearing = DESIGN_TO_LOGICAL(glyphMetrics.rightSideBearing);
+        QFixed advanceHeight = DESIGN_TO_LOGICAL(glyphMetrics.advanceHeight);
+        QFixed verticalOriginY = DESIGN_TO_LOGICAL(glyphMetrics.verticalOriginY);
+
+        if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
+            advanceWidth = advanceWidth.round();
+            advanceHeight = advanceHeight.round();
+        }
+
+        QFixed width = advanceWidth - leftSideBearing - rightSideBearing;
+
+        return glyph_metrics_t(-leftSideBearing, -verticalOriginY,
+                               width, m_ascent + m_descent,
+                               advanceWidth, advanceHeight);
+    } else {
+        qErrnoWarning("QFontEngineDirectWrite::boundingBox: GetDesignGlyphMetrics failed");
+    }
+
+    return glyph_metrics_t();
+}
+
+QFixed QFontEngineDirectWrite::ascent() const
+{
+    return fontDef.styleStrategy & QFont::ForceIntegerMetrics
+            ? m_ascent.round()
+            : m_ascent;
+}
+
+QFixed QFontEngineDirectWrite::descent() const
+{
+    return fontDef.styleStrategy & QFont::ForceIntegerMetrics
+           ? (m_descent - 1).round()
+           : (m_descent - 1);
+}
+
+QFixed QFontEngineDirectWrite::leading() const
+{
+    return fontDef.styleStrategy & QFont::ForceIntegerMetrics
+           ? m_lineGap.round()
+           : m_lineGap;
+}
+
+QFixed QFontEngineDirectWrite::xHeight() const
+{
+    return fontDef.styleStrategy & QFont::ForceIntegerMetrics
+           ? m_xHeight.round()
+           : m_xHeight;
+}
+
+qreal QFontEngineDirectWrite::maxCharWidth() const
+{
+    // ###
+    return 0;
+}
+
+extern uint qt_pow_gamma[256];
+
+QImage QFontEngineDirectWrite::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition)
+{
+    QImage im = imageForGlyph(glyph, subPixelPosition, 0, QTransform());
+
+    QImage indexed(im.width(), im.height(), QImage::Format_Indexed8);
+    QVector<QRgb> colors(256);
+    for (int i=0; i<256; ++i)
+        colors[i] = qRgba(0, 0, 0, i);
+    indexed.setColorTable(colors);
+
+    for (int y=0; y<im.height(); ++y) {
+        uint *src = (uint*) im.scanLine(y);
+        uchar *dst = indexed.scanLine(y);
+        for (int x=0; x<im.width(); ++x) {
+            *dst = 255 - (qt_pow_gamma[qGray(0xffffffff - *src)] * 255. / 2047.);
+            ++dst;
+            ++src;
+        }
+    }
+
+    return indexed;
+}
+
+bool QFontEngineDirectWrite::supportsSubPixelPositions() const
+{
+    return true;
+}
+
+QImage QFontEngineDirectWrite::imageForGlyph(glyph_t t,
+                                             QFixed subPixelPosition,
+                                             int margin,
+                                             const QTransform &xform)
+{
+    glyph_metrics_t metrics = QFontEngine::boundingBox(t, xform);
+    int width = (metrics.width + margin * 2 + 4).ceil().toInt() ;
+    int height = (metrics.height + margin * 2 + 4).ceil().toInt();
+
+    UINT16 glyphIndex = t;
+    FLOAT glyphAdvance = metrics.xoff.toReal();
+
+    DWRITE_GLYPH_OFFSET glyphOffset;
+    glyphOffset.advanceOffset = 0;
+    glyphOffset.ascenderOffset = 0;
+
+    DWRITE_GLYPH_RUN glyphRun;
+    glyphRun.fontFace = m_directWriteFontFace;
+    glyphRun.fontEmSize = fontDef.pixelSize;
+    glyphRun.glyphCount = 1;
+    glyphRun.glyphIndices = &glyphIndex;
+    glyphRun.glyphAdvances = &glyphAdvance;
+    glyphRun.isSideways = false;
+    glyphRun.bidiLevel = 0;
+    glyphRun.glyphOffsets = &glyphOffset;
+
+    QFixed x = margin - metrics.x.round() + subPixelPosition;
+    QFixed y = margin - metrics.y.floor();
+
+    DWRITE_MATRIX transform;
+    transform.dx = x.toReal();
+    transform.dy = y.toReal();
+    transform.m11 = xform.m11();
+    transform.m12 = xform.m12();
+    transform.m21 = xform.m21();
+    transform.m22 = xform.m22();
+
+    IDWriteGlyphRunAnalysis *glyphAnalysis = NULL;
+    HRESULT hr = m_directWriteFactory->CreateGlyphRunAnalysis(
+                &glyphRun,
+                1.0f,
+                &transform,
+                DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC,
+                DWRITE_MEASURING_MODE_NATURAL,
+                0.0, 0.0,
+                &glyphAnalysis
+                );
+
+    if (SUCCEEDED(hr)) {
+        RECT rect;
+        rect.left = 0;
+        rect.top = 0;
+        rect.right = width;
+        rect.bottom = height;
+
+        int size = width * height * 3;
+        BYTE *alphaValues = new BYTE[size];
+        qMemSet(alphaValues, size, 0);
+
+        hr = glyphAnalysis->CreateAlphaTexture(DWRITE_TEXTURE_CLEARTYPE_3x1,
+                                               &rect,
+                                               alphaValues,
+                                               size);
+
+        if (SUCCEEDED(hr)) {
+            QImage img(width, height, QImage::Format_RGB32);
+            img.fill(0xffffffff);
+
+            for (int y=0; y<height; ++y) {
+                uint *dest = reinterpret_cast<uint *>(img.scanLine(y));
+                BYTE *src = alphaValues + width * 3 * y;
+
+                for (int x=0; x<width; ++x) {
+                    dest[x] = *(src) << 16
+                            | *(src + 1) << 8
+                            | *(src + 2);
+
+                    src += 3;
+                }
+            }
+
+            delete[] alphaValues;
+            glyphAnalysis->Release();
+
+            return img;
+        } else {
+            delete[] alphaValues;
+            glyphAnalysis->Release();
+
+            qErrnoWarning("QFontEngineDirectWrite::imageForGlyph: CreateAlphaTexture failed");
+        }
+
+    } else {
+        qErrnoWarning("QFontEngineDirectWrite::imageForGlyph: CreateGlyphRunAnalysis failed");
+    }
+
+    return QImage();
+}
+
+QImage QFontEngineDirectWrite::alphaRGBMapForGlyph(glyph_t t,
+                                                   QFixed subPixelPosition,
+                                                   int margin,
+                                                   const QTransform &xform)
+{
+    QImage mask = imageForGlyph(t, subPixelPosition, margin, xform);
+    return mask.depth() == 32
+           ? mask
+           : mask.convertToFormat(QImage::Format_RGB32);
+}
+
+const char *QFontEngineDirectWrite::name() const
+{
+    return 0;
+}
+
+bool QFontEngineDirectWrite::canRender(const QChar *string, int len)
+{
+    QVarLengthArray<UINT32> codePoints(len);
+    int actualLength = 0;
+    for (int i=0; i<len; ++i, actualLength++)
+        codePoints[actualLength] = getChar(string, i, len);
+
+    QVarLengthArray<UINT16> glyphIndices(actualLength);
+    HRESULT hr = m_directWriteFontFace->GetGlyphIndices(codePoints.data(), actualLength,
+                                                        glyphIndices.data());
+    if (FAILED(hr)) {
+        qErrnoWarning(hr, "QFontEngineDirectWrite::canRender: GetGlyphIndices failed");
+        return false;
+    } else {
+        for (int i=0; i<glyphIndices.size(); ++i) {
+            if (glyphIndices.at(i) == 0)
+                return false;
+        }
+
+        return true;
+    }
+}
+
+QFontEngine::Type QFontEngineDirectWrite::type() const
+{
+    return QFontEngine::DirectWrite;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_DIRECTWRITE