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Diffstat (limited to 'src/gui/text/qfontenginedirectwrite.cpp')
| -rw-r--r-- | src/gui/text/qfontenginedirectwrite.cpp | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/src/gui/text/qfontenginedirectwrite.cpp b/src/gui/text/qfontenginedirectwrite.cpp new file mode 100644 index 0000000..af5bab2 --- /dev/null +++ b/src/gui/text/qfontenginedirectwrite.cpp @@ -0,0 +1,641 @@ +/**************************************************************************** +** +** 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(const QString &name, + IDWriteFactory *directWriteFactory, + IDWriteGdiInterop *directWriteGdiInterop, + IDWriteFont *directWriteFont, + qreal pixelSize) + : m_name(name) + , m_directWriteFont(directWriteFont) + , m_directWriteFontFace(0) + , m_directWriteFactory(directWriteFactory) + , m_directWriteBitmapRenderTarget(0) + , m_directWriteGdiInterop(directWriteGdiInterop) + , m_lineThickness(-1) + , m_unitsPerEm(-1) + , m_ascent(-1) + , m_descent(-1) + , m_xHeight(-1) + , m_lineGap(-1) +{ + m_directWriteFont->AddRef(); + m_directWriteFactory->AddRef(); + m_directWriteGdiInterop->AddRef(); + + fontDef.pixelSize = pixelSize; + + HRESULT hr = m_directWriteFont->CreateFontFace(&m_directWriteFontFace); + if (FAILED(hr)) + qErrnoWarning("QFontEngineDirectWrite: CreateFontFace failed"); + + collectMetrics(); +} + +QFontEngineDirectWrite::~QFontEngineDirectWrite() +{ + m_directWriteFont->Release(); + m_directWriteFactory->Release(); + m_directWriteGdiInterop->Release(); + + if (m_directWriteBitmapRenderTarget != 0) + m_directWriteBitmapRenderTarget->Release(); +} + +void QFontEngineDirectWrite::collectMetrics() +{ + if (m_directWriteFont != 0) { + DWRITE_FONT_METRICS metrics; + + m_directWriteFont->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) +{ + for (int i=0; i<len; ++i) { + BOOL exists; + UINT32 codePoint = getChar(string, i, len); + HRESULT hr = m_directWriteFont->HasCharacter(codePoint, &exists); + if (FAILED(hr)) { + qErrnoWarning("QFontEngineDirectWrite::canRender: HasCharacter failed"); + return false; + } else if (!exists) { + return false; + } + } + + return true; +} + +QFontEngine::Type QFontEngineDirectWrite::type() const +{ + return QFontEngine::DirectWrite; +} + +QT_END_NAMESPACE + +#endif // QT_NO_DIRECTWRITE |