whytofly
/
qt6-bb10
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
qt6-bb10/src/gui/text/qfontengine.cpp

1927 lines
60 KiB
C++
Raw Blame History

/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <qdebug.h>
#include <private/qfontengine_p.h>
#include "qbitmap.h"
#include "qpainter.h"
#include "qpainterpath.h"
#include "qvarlengtharray.h"
#include <qmath.h>
#include <qendian.h>
#ifdef QT_ENABLE_HARFBUZZ_NG
# include "qharfbuzzng_p.h"
# include <harfbuzz/hb-ot.h>
#endif
#include <private/qharfbuzz_p.h>
#include <algorithm>
QT_BEGIN_NAMESPACE
static inline bool qtransform_equals_no_translate(const QTransform &a, const QTransform &b)
{
if (a.type() <= QTransform::TxTranslate && b.type() <= QTransform::TxTranslate) {
return true;
} else {
// We always use paths for perspective text anyway, so no
// point in checking the full matrix...
Q_ASSERT(a.type() < QTransform::TxProject);
Q_ASSERT(b.type() < QTransform::TxProject);
return a.m11() == b.m11()
&& a.m12() == b.m12()
&& a.m21() == b.m21()
&& a.m22() == b.m22();
}
}
// Harfbuzz helper functions
#ifdef QT_ENABLE_HARFBUZZ_NG
bool useHarfbuzzNG = qgetenv("QT_HARFBUZZ") != "old";
#endif
Q_STATIC_ASSERT(sizeof(HB_Glyph) == sizeof(glyph_t));
Q_STATIC_ASSERT(sizeof(HB_Fixed) == sizeof(QFixed));
static HB_Bool hb_stringToGlyphs(HB_Font font, const HB_UChar16 *string, hb_uint32 length, HB_Glyph *glyphs, hb_uint32 *numGlyphs, HB_Bool rightToLeft)
{
QFontEngine *fe = (QFontEngine *)font->userData;
const QChar *str = reinterpret_cast<const QChar *>(string);
QGlyphLayout qglyphs;
qglyphs.numGlyphs = *numGlyphs;
qglyphs.glyphs = glyphs;
int nGlyphs = *numGlyphs;
bool result = fe->stringToCMap(str, length, &qglyphs, &nGlyphs, QFontEngine::GlyphIndicesOnly);
*numGlyphs = nGlyphs;
if (rightToLeft && result && !fe->symbol) {
uint glyph_pos = 0;
for (uint i = 0; i < length; ++i, ++glyph_pos) {
uint ucs4 = str[i].unicode();
if (Q_UNLIKELY(QChar::isHighSurrogate(ucs4) && i + 1 < length)) {
uint low = str[i + 1].unicode();
if (Q_LIKELY(QChar::isLowSurrogate(low))) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++i;
}
}
uint mirrored = QChar::mirroredChar(ucs4);
if (Q_UNLIKELY(mirrored != ucs4)) {
QChar chars[2];
uint numChars = 0;
if (Q_UNLIKELY(QChar::requiresSurrogates(mirrored))) {
chars[numChars++] = QChar(QChar::highSurrogate(mirrored));
chars[numChars++] = QChar(QChar::lowSurrogate(mirrored));
} else {
chars[numChars++] = QChar(mirrored);
}
qglyphs.numGlyphs = numChars;
qglyphs.glyphs = glyphs + glyph_pos;
nGlyphs = numChars;
if (!fe->stringToCMap(chars, numChars, &qglyphs, &nGlyphs, QFontEngine::GlyphIndicesOnly))
Q_UNREACHABLE();
Q_ASSERT(nGlyphs == 1);
}
}
}
return result;
}
static void hb_getAdvances(HB_Font font, const HB_Glyph *glyphs, hb_uint32 numGlyphs, HB_Fixed *advances, int flags)
{
QFontEngine *fe = (QFontEngine *)font->userData;
QGlyphLayout qglyphs;
qglyphs.numGlyphs = numGlyphs;
qglyphs.glyphs = const_cast<glyph_t *>(glyphs);
qglyphs.advances = reinterpret_cast<QFixed *>(advances);
fe->recalcAdvances(&qglyphs, (flags & HB_ShaperFlag_UseDesignMetrics) ? QFontEngine::DesignMetrics : QFontEngine::ShaperFlags(0));
}
static HB_Bool hb_canRender(HB_Font font, const HB_UChar16 *string, hb_uint32 length)
{
QFontEngine *fe = (QFontEngine *)font->userData;
return fe->canRender(reinterpret_cast<const QChar *>(string), length);
}
static void hb_getGlyphMetrics(HB_Font font, HB_Glyph glyph, HB_GlyphMetrics *metrics)
{
QFontEngine *fe = (QFontEngine *)font->userData;
glyph_metrics_t m = fe->boundingBox(glyph);
metrics->x = m.x.value();
metrics->y = m.y.value();
metrics->width = m.width.value();
metrics->height = m.height.value();
metrics->xOffset = m.xoff.value();
metrics->yOffset = m.yoff.value();
}
static HB_Fixed hb_getFontMetric(HB_Font font, HB_FontMetric metric)
{
if (metric == HB_FontAscent) {
QFontEngine *fe = (QFontEngine *)font->userData;
return fe->ascent().value();
}
return 0;
}
int QFontEngine::getPointInOutline(glyph_t glyph, int flags, quint32 point, QFixed *xpos, QFixed *ypos, quint32 *nPoints)
{
Q_UNUSED(glyph)
Q_UNUSED(flags)
Q_UNUSED(point)
Q_UNUSED(xpos)
Q_UNUSED(ypos)
Q_UNUSED(nPoints)
return Err_Not_Covered;
}
static HB_Error hb_getPointInOutline(HB_Font font, HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints)
{
QFontEngine *fe = (QFontEngine *)font->userData;
return (HB_Error)fe->getPointInOutline(glyph, flags, point, (QFixed *)xpos, (QFixed *)ypos, (quint32 *)nPoints);
}
static const HB_FontClass hb_fontClass = {
hb_stringToGlyphs, hb_getAdvances, hb_canRender, hb_getPointInOutline,
hb_getGlyphMetrics, hb_getFontMetric
};
static HB_Error hb_getSFntTable(void *font, HB_Tag tableTag, HB_Byte *buffer, HB_UInt *length)
{
QFontEngine *fe = (QFontEngine *)font;
Q_ASSERT(fe->faceData.get_font_table);
if (!fe->faceData.get_font_table(fe->faceData.user_data, tableTag, buffer, length))
return HB_Err_Invalid_Argument;
return HB_Err_Ok;
}
static void hb_freeFace(void *face)
{
qHBFreeFace((HB_Face)face);
}
static bool qt_get_font_table_default(void *user_data, uint tag, uchar *buffer, uint *length)
{
QFontEngine *fe = (QFontEngine *)user_data;
return fe->getSfntTableData(tag, buffer, length);
}
#ifdef QT_BUILD_INTERNAL
// for testing purpose only, not thread-safe!
static QList<QFontEngine *> *enginesCollector = 0;
Q_AUTOTEST_EXPORT void QFontEngine_startCollectingEngines()
{
delete enginesCollector;
enginesCollector = new QList<QFontEngine *>();
}
Q_AUTOTEST_EXPORT QList<QFontEngine *> QFontEngine_stopCollectingEngines()
{
Q_ASSERT(enginesCollector);
QList<QFontEngine *> ret = *enginesCollector;
delete enginesCollector;
enginesCollector = 0;
return ret;
}
#endif // QT_BUILD_INTERNAL
// QFontEngine
QFontEngine::QFontEngine()
: ref(0),
font_(0), font_destroy_func(0),
face_(0), face_destroy_func(0)
{
faceData.user_data = this;
faceData.get_font_table = qt_get_font_table_default;
cache_cost = 0;
fsType = 0;
symbol = false;
glyphFormat = -1;
m_subPixelPositionCount = 0;
#ifdef QT_BUILD_INTERNAL
if (enginesCollector)
enginesCollector->append(this);
#endif
}
QFontEngine::~QFontEngine()
{
m_glyphCaches.clear();
if (font_ && font_destroy_func) {
font_destroy_func(font_);
font_ = 0;
}
if (face_ && face_destroy_func) {
face_destroy_func(face_);
face_ = 0;
}
#ifdef QT_BUILD_INTERNAL
if (enginesCollector)
enginesCollector->removeOne(this);
#endif
}
QFixed QFontEngine::lineThickness() const
{
// ad hoc algorithm
int score = fontDef.weight * fontDef.pixelSize;
int lw = score / 700;
// looks better with thicker line for small pointsizes
if (lw < 2 && score >= 1050) lw = 2;
if (lw == 0) lw = 1;
return lw;
}
QFixed QFontEngine::underlinePosition() const
{
return ((lineThickness() * 2) + 3) / 6;
}
void *QFontEngine::harfbuzzFont() const
{
#ifdef QT_ENABLE_HARFBUZZ_NG
if (useHarfbuzzNG)
return hb_qt_font_get_for_engine(const_cast<QFontEngine *>(this));
#endif
if (!font_) {
HB_Face hbFace = (HB_Face)harfbuzzFace();
if (hbFace->font_for_init != 0)
q_check_ptr(qHBLoadFace(hbFace));
HB_FontRec *hbFont = (HB_FontRec *) malloc(sizeof(HB_FontRec));
Q_CHECK_PTR(hbFont);
hbFont->klass = &hb_fontClass;
hbFont->userData = const_cast<QFontEngine *>(this);
qint64 emSquare = emSquareSize().truncate();
Q_ASSERT(emSquare == emSquareSize().toInt()); // ensure no truncation
if (emSquare == 0)
emSquare = 1000; // a fallback value suitable for Type1 fonts
hbFont->y_ppem = fontDef.pixelSize;
hbFont->x_ppem = fontDef.pixelSize * fontDef.stretch / 100;
// same as QFixed(x)/QFixed(emSquare) but without int32 overflow for x
hbFont->x_scale = (((qint64)hbFont->x_ppem << 6) * 0x10000L + (emSquare >> 1)) / emSquare;
hbFont->y_scale = (((qint64)hbFont->y_ppem << 6) * 0x10000L + (emSquare >> 1)) / emSquare;
font_ = (void *)hbFont;
font_destroy_func = free;
}
return font_;
}
void *QFontEngine::harfbuzzFace() const
{
#ifdef QT_ENABLE_HARFBUZZ_NG
if (useHarfbuzzNG)
return hb_qt_face_get_for_engine(const_cast<QFontEngine *>(this));
#endif
if (!face_) {
HB_Face hbFace = qHBNewFace(const_cast<QFontEngine *>(this), hb_getSFntTable);
Q_CHECK_PTR(hbFace);
hbFace->isSymbolFont = symbol;
face_ = (void *)hbFace;
face_destroy_func = hb_freeFace;
}
return face_;
}
bool QFontEngine::supportsScript(QChar::Script script) const
{
// ### TODO: This only works for scripts that require OpenType. More generally
// for scripts that do not require OpenType we should just look at the list of
// supported writing systems in the font's OS/2 table.
if (!((script >= QChar::Script_Syriac && script <= QChar::Script_Sinhala)
|| script == QChar::Script_Khmer || script == QChar::Script_Nko)) {
return true;
}
#ifdef QT_ENABLE_HARFBUZZ_NG
if (useHarfbuzzNG) {
bool ret = false;
if (hb_face_t *face = hb_qt_face_get_for_engine(const_cast<QFontEngine *>(this))) {
hb_tag_t script_tag_1, script_tag_2;
hb_ot_tags_from_script(hb_qt_script_to_script(script), &script_tag_1, &script_tag_2);
unsigned int script_index = -1;
ret = hb_ot_layout_table_find_script(face, HB_OT_TAG_GSUB, script_tag_1, &script_index);
if (!ret) {
ret = hb_ot_layout_table_find_script(face, HB_OT_TAG_GSUB, script_tag_2, &script_index);
if (!ret && script_tag_2 != HB_OT_TAG_DEFAULT_SCRIPT)
ret = hb_ot_layout_table_find_script(face, HB_OT_TAG_GSUB, HB_OT_TAG_DEFAULT_SCRIPT, &script_index);
}
hb_face_destroy(face);
}
return ret;
}
#endif
HB_Face hbFace = (HB_Face)harfbuzzFace();
if (hbFace->font_for_init != 0)
q_check_ptr(qHBLoadFace(hbFace));
return hbFace->supported_scripts[script_to_hbscript(script)];
}
glyph_metrics_t QFontEngine::boundingBox(glyph_t glyph, const QTransform &matrix)
{
glyph_metrics_t metrics = boundingBox(glyph);
if (matrix.type() > QTransform::TxTranslate) {
return metrics.transformed(matrix);
}
return metrics;
}
QFixed QFontEngine::xHeight() const
{
QGlyphLayoutArray<8> glyphs;
int nglyphs = 7;
QChar x((ushort)'x');
stringToCMap(&x, 1, &glyphs, &nglyphs, GlyphIndicesOnly);
glyph_metrics_t bb = const_cast<QFontEngine *>(this)->boundingBox(glyphs.glyphs[0]);
return bb.height;
}
QFixed QFontEngine::averageCharWidth() const
{
QGlyphLayoutArray<8> glyphs;
int nglyphs = 7;
QChar x((ushort)'x');
stringToCMap(&x, 1, &glyphs, &nglyphs, GlyphIndicesOnly);
glyph_metrics_t bb = const_cast<QFontEngine *>(this)->boundingBox(glyphs.glyphs[0]);
return bb.xoff;
}
bool QFontEngine::supportsTransformation(const QTransform &transform) const
{
return transform.type() < QTransform::TxProject;
}
void QFontEngine::getGlyphPositions(const QGlyphLayout &glyphs, const QTransform &matrix, QTextItem::RenderFlags flags,
QVarLengthArray<glyph_t> &glyphs_out, QVarLengthArray<QFixedPoint> &positions)
{
QFixed xpos;
QFixed ypos;
const bool transform = matrix.m11() != 1.
|| matrix.m12() != 0.
|| matrix.m21() != 0.
|| matrix.m22() != 1.;
if (!transform) {
xpos = QFixed::fromReal(matrix.dx());
ypos = QFixed::fromReal(matrix.dy());
}
int current = 0;
if (flags & QTextItem::RightToLeft) {
int i = glyphs.numGlyphs;
int totalKashidas = 0;
while(i--) {
if (glyphs.attributes[i].dontPrint)
continue;
xpos += glyphs.advances[i] + QFixed::fromFixed(glyphs.justifications[i].space_18d6);
totalKashidas += glyphs.justifications[i].nKashidas;
}
positions.resize(glyphs.numGlyphs+totalKashidas);
glyphs_out.resize(glyphs.numGlyphs+totalKashidas);
i = 0;
while(i < glyphs.numGlyphs) {
if (glyphs.attributes[i].dontPrint) {
++i;
continue;
}
xpos -= glyphs.advances[i];
QFixed gpos_x = xpos + glyphs.offsets[i].x;
QFixed gpos_y = ypos + glyphs.offsets[i].y;
if (transform) {
QPointF gpos(gpos_x.toReal(), gpos_y.toReal());
gpos = gpos * matrix;
gpos_x = QFixed::fromReal(gpos.x());
gpos_y = QFixed::fromReal(gpos.y());
}
positions[current].x = gpos_x;
positions[current].y = gpos_y;
glyphs_out[current] = glyphs.glyphs[i];
++current;
if (glyphs.justifications[i].nKashidas) {
QChar ch(0x640); // Kashida character
QGlyphLayoutArray<8> g;
int nglyphs = 7;
stringToCMap(&ch, 1, &g, &nglyphs, 0);
for (uint k = 0; k < glyphs.justifications[i].nKashidas; ++k) {
xpos -= g.advances[0];
QFixed gpos_x = xpos + glyphs.offsets[i].x;
QFixed gpos_y = ypos + glyphs.offsets[i].y;
if (transform) {
QPointF gpos(gpos_x.toReal(), gpos_y.toReal());
gpos = gpos * matrix;
gpos_x = QFixed::fromReal(gpos.x());
gpos_y = QFixed::fromReal(gpos.y());
}
positions[current].x = gpos_x;
positions[current].y = gpos_y;
glyphs_out[current] = g.glyphs[0];
++current;
}
} else {
xpos -= QFixed::fromFixed(glyphs.justifications[i].space_18d6);
}
++i;
}
} else {
positions.resize(glyphs.numGlyphs);
glyphs_out.resize(glyphs.numGlyphs);
int i = 0;
if (!transform) {
while (i < glyphs.numGlyphs) {
if (!glyphs.attributes[i].dontPrint) {
positions[current].x = xpos + glyphs.offsets[i].x;
positions[current].y = ypos + glyphs.offsets[i].y;
glyphs_out[current] = glyphs.glyphs[i];
xpos += glyphs.advances[i] + QFixed::fromFixed(glyphs.justifications[i].space_18d6);
++current;
}
++i;
}
} else {
while (i < glyphs.numGlyphs) {
if (!glyphs.attributes[i].dontPrint) {
QFixed gpos_x = xpos + glyphs.offsets[i].x;
QFixed gpos_y = ypos + glyphs.offsets[i].y;
QPointF gpos(gpos_x.toReal(), gpos_y.toReal());
gpos = gpos * matrix;
positions[current].x = QFixed::fromReal(gpos.x());
positions[current].y = QFixed::fromReal(gpos.y());
glyphs_out[current] = glyphs.glyphs[i];
xpos += glyphs.advances[i] + QFixed::fromFixed(glyphs.justifications[i].space_18d6);
++current;
}
++i;
}
}
}
positions.resize(current);
glyphs_out.resize(current);
Q_ASSERT(positions.size() == glyphs_out.size());
}
void QFontEngine::getGlyphBearings(glyph_t glyph, qreal *leftBearing, qreal *rightBearing)
{
glyph_metrics_t gi = boundingBox(glyph);
bool isValid = gi.isValid();
if (leftBearing != 0)
*leftBearing = isValid ? gi.x.toReal() : 0.0;
if (rightBearing != 0)
*rightBearing = isValid ? (gi.xoff - gi.x - gi.width).toReal() : 0.0;
}
glyph_metrics_t QFontEngine::tightBoundingBox(const QGlyphLayout &glyphs)
{
glyph_metrics_t overall;
QFixed ymax = 0;
QFixed xmax = 0;
for (int i = 0; i < glyphs.numGlyphs; i++) {
glyph_metrics_t bb = boundingBox(glyphs.glyphs[i]);
QFixed x = overall.xoff + glyphs.offsets[i].x + bb.x;
QFixed y = overall.yoff + glyphs.offsets[i].y + bb.y;
overall.x = qMin(overall.x, x);
overall.y = qMin(overall.y, y);
xmax = qMax(xmax, x + bb.width);
ymax = qMax(ymax, y + bb.height);
overall.xoff += bb.xoff;
overall.yoff += bb.yoff;
}
overall.height = qMax(overall.height, ymax - overall.y);
overall.width = xmax - overall.x;
return overall;
}
void QFontEngine::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path,
QTextItem::RenderFlags flags)
{
if (!glyphs.numGlyphs)
return;
QVarLengthArray<QFixedPoint> positions;
QVarLengthArray<glyph_t> positioned_glyphs;
QTransform matrix = QTransform::fromTranslate(x, y);
getGlyphPositions(glyphs, matrix, flags, positioned_glyphs, positions);
addGlyphsToPath(positioned_glyphs.data(), positions.data(), positioned_glyphs.size(), path, flags);
}
#define GRID(x, y) grid[(y)*(w+1) + (x)]
#define SET(x, y) (*(image_data + (y)*bpl + ((x) >> 3)) & (0x80 >> ((x) & 7)))
enum { EdgeRight = 0x1,
EdgeDown = 0x2,
EdgeLeft = 0x4,
EdgeUp = 0x8
};
static void collectSingleContour(qreal x0, qreal y0, uint *grid, int x, int y, int w, int h, QPainterPath *path)
{
Q_UNUSED(h);
path->moveTo(x + x0, y + y0);
while (GRID(x, y)) {
if (GRID(x, y) & EdgeRight) {
while (GRID(x, y) & EdgeRight) {
GRID(x, y) &= ~EdgeRight;
++x;
}
Q_ASSERT(x <= w);
path->lineTo(x + x0, y + y0);
continue;
}
if (GRID(x, y) & EdgeDown) {
while (GRID(x, y) & EdgeDown) {
GRID(x, y) &= ~EdgeDown;
++y;
}
Q_ASSERT(y <= h);
path->lineTo(x + x0, y + y0);
continue;
}
if (GRID(x, y) & EdgeLeft) {
while (GRID(x, y) & EdgeLeft) {
GRID(x, y) &= ~EdgeLeft;
--x;
}
Q_ASSERT(x >= 0);
path->lineTo(x + x0, y + y0);
continue;
}
if (GRID(x, y) & EdgeUp) {
while (GRID(x, y) & EdgeUp) {
GRID(x, y) &= ~EdgeUp;
--y;
}
Q_ASSERT(y >= 0);
path->lineTo(x + x0, y + y0);
continue;
}
}
path->closeSubpath();
}
Q_GUI_EXPORT void qt_addBitmapToPath(qreal x0, qreal y0, const uchar *image_data, int bpl, int w, int h, QPainterPath *path)
{
uint *grid = new uint[(w+1)*(h+1)];
// set up edges
for (int y = 0; y <= h; ++y) {
for (int x = 0; x <= w; ++x) {
bool topLeft = (x == 0)|(y == 0) ? false : SET(x - 1, y - 1);
bool topRight = (x == w)|(y == 0) ? false : SET(x, y - 1);
bool bottomLeft = (x == 0)|(y == h) ? false : SET(x - 1, y);
bool bottomRight = (x == w)|(y == h) ? false : SET(x, y);
GRID(x, y) = 0;
if ((!topRight) & bottomRight)
GRID(x, y) |= EdgeRight;
if ((!bottomRight) & bottomLeft)
GRID(x, y) |= EdgeDown;
if ((!bottomLeft) & topLeft)
GRID(x, y) |= EdgeLeft;
if ((!topLeft) & topRight)
GRID(x, y) |= EdgeUp;
}
}
// collect edges
for (int y = 0; y < h; ++y) {
for (int x = 0; x < w; ++x) {
if (!GRID(x, y))
continue;
// found start of a contour, follow it
collectSingleContour(x0, y0, grid, x, y, w, h, path);
}
}
delete [] grid;
}
#undef GRID
#undef SET
void QFontEngine::addBitmapFontToPath(qreal x, qreal y, const QGlyphLayout &glyphs,
QPainterPath *path, QTextItem::RenderFlags flags)
{
// TODO what to do with 'flags' ??
Q_UNUSED(flags);
QFixed advanceX = QFixed::fromReal(x);
QFixed advanceY = QFixed::fromReal(y);
for (int i=0; i < glyphs.numGlyphs; ++i) {
glyph_metrics_t metrics = boundingBox(glyphs.glyphs[i]);
if (metrics.width.value() == 0 || metrics.height.value() == 0) {
advanceX += glyphs.advances[i];
continue;
}
const QImage alphaMask = alphaMapForGlyph(glyphs.glyphs[i]);
const int w = alphaMask.width();
const int h = alphaMask.height();
const int srcBpl = alphaMask.bytesPerLine();
QImage bitmap;
if (alphaMask.depth() == 1) {
bitmap = alphaMask;
} else {
bitmap = QImage(w, h, QImage::Format_Mono);
const uchar *imageData = alphaMask.bits();
const int destBpl = bitmap.bytesPerLine();
uchar *bitmapData = bitmap.bits();
for (int yi = 0; yi < h; ++yi) {
const uchar *src = imageData + yi*srcBpl;
uchar *dst = bitmapData + yi*destBpl;
for (int xi = 0; xi < w; ++xi) {
const int byte = xi / 8;
const int bit = xi % 8;
if (bit == 0)
dst[byte] = 0;
if (src[xi])
dst[byte] |= 128 >> bit;
}
}
}
const uchar *bitmap_data = bitmap.bits();
QFixedPoint offset = glyphs.offsets[i];
advanceX += offset.x;
advanceY += offset.y;
qt_addBitmapToPath((advanceX + metrics.x).toReal(), (advanceY + metrics.y).toReal(), bitmap_data, bitmap.bytesPerLine(), w, h, path);
advanceX += glyphs.advances[i];
}
}
void QFontEngine::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nGlyphs,
QPainterPath *path, QTextItem::RenderFlags flags)
{
qreal x = positions[0].x.toReal();
qreal y = positions[0].y.toReal();
QVarLengthGlyphLayoutArray g(nGlyphs);
for (int i = 0; i < nGlyphs - 1; ++i) {
g.glyphs[i] = glyphs[i];
g.advances[i] = positions[i + 1].x - positions[i].x;
}
g.glyphs[nGlyphs - 1] = glyphs[nGlyphs - 1];
g.advances[nGlyphs - 1] = QFixed::fromReal(maxCharWidth());
addBitmapFontToPath(x, y, g, path, flags);
}
QImage QFontEngine::alphaMapForGlyph(glyph_t glyph, QFixed /*subPixelPosition*/)
{
// For font engines don't support subpixel positioning
return alphaMapForGlyph(glyph);
}
QImage QFontEngine::alphaMapForGlyph(glyph_t glyph, const QTransform &t)
{
QImage i = alphaMapForGlyph(glyph);
if (t.type() > QTransform::TxTranslate)
i = i.transformed(t).convertToFormat(QImage::Format_Indexed8);
Q_ASSERT(i.depth() <= 8); // To verify that transformed didn't change the format...
return i;
}
QImage QFontEngine::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t)
{
if (! supportsSubPixelPositions())
return alphaMapForGlyph(glyph, t);
QImage i = alphaMapForGlyph(glyph, subPixelPosition);
if (t.type() > QTransform::TxTranslate)
i = i.transformed(t).convertToFormat(QImage::Format_Indexed8);
Q_ASSERT(i.depth() <= 8); // To verify that transformed didn't change the format...
return i;
}
QImage QFontEngine::alphaRGBMapForGlyph(glyph_t glyph, QFixed /*subPixelPosition*/, const QTransform &t)
{
QImage alphaMask = alphaMapForGlyph(glyph, t);
QImage rgbMask(alphaMask.width(), alphaMask.height(), QImage::Format_RGB32);
QVector<QRgb> colorTable = alphaMask.colorTable();
for (int y=0; y<alphaMask.height(); ++y) {
uint *dst = (uint *) rgbMask.scanLine(y);
uchar *src = (uchar *) alphaMask.scanLine(y);
for (int x=0; x<alphaMask.width(); ++x) {
int val = qAlpha(colorTable.at(src[x]));
dst[x] = qRgb(val, val, val);
}
}
return rgbMask;
}
QImage QFontEngine::bitmapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform&)
{
Q_UNUSED(subPixelPosition);
return QImage();
}
QFixed QFontEngine::subPixelPositionForX(QFixed x) const
{
if (m_subPixelPositionCount <= 1 || !supportsSubPixelPositions())
return QFixed();
QFixed subPixelPosition;
if (x != 0) {
subPixelPosition = x - x.floor();
QFixed fraction = (subPixelPosition / QFixed::fromReal(1.0 / m_subPixelPositionCount)).floor();
// Compensate for precision loss in fixed point to make sure we are always drawing at a subpixel position over
// the lower boundary for the selected rasterization by adding 1/64.
subPixelPosition = fraction / QFixed(m_subPixelPositionCount) + QFixed::fromReal(0.015625);
}
return subPixelPosition;
}
QImage *QFontEngine::lockedAlphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition,
QFontEngine::GlyphFormat neededFormat,
const QTransform &t, QPoint *offset)
{
Q_ASSERT(currentlyLockedAlphaMap.isNull());
if (neededFormat == Format_None)
neededFormat = Format_A32;
if (neededFormat != Format_A32)
currentlyLockedAlphaMap = alphaMapForGlyph(glyph, subPixelPosition, t);
else
currentlyLockedAlphaMap = alphaRGBMapForGlyph(glyph, subPixelPosition, t);
if (offset != 0)
*offset = QPoint(0, 0);
return &currentlyLockedAlphaMap;
}
void QFontEngine::unlockAlphaMapForGlyph()
{
Q_ASSERT(!currentlyLockedAlphaMap.isNull());
currentlyLockedAlphaMap = QImage();
}
QImage QFontEngine::alphaMapForGlyph(glyph_t glyph)
{
glyph_metrics_t gm = boundingBox(glyph);
int glyph_x = qFloor(gm.x.toReal());
int glyph_y = qFloor(gm.y.toReal());
int glyph_width = qCeil((gm.x + gm.width).toReal()) - glyph_x;
int glyph_height = qCeil((gm.y + gm.height).toReal()) - glyph_y;
if (glyph_width <= 0 || glyph_height <= 0)
return QImage();
QFixedPoint pt;
pt.x = -glyph_x;
pt.y = -glyph_y; // the baseline
QPainterPath path;
QImage im(glyph_width + 4, glyph_height, QImage::Format_ARGB32_Premultiplied);
im.fill(Qt::transparent);
QPainter p(&im);
p.setRenderHint(QPainter::Antialiasing);
addGlyphsToPath(&glyph, &pt, 1, &path, 0);
p.setPen(Qt::NoPen);
p.setBrush(Qt::black);
p.drawPath(path);
p.end();
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) {
uchar *dst = (uchar *) indexed.scanLine(y);
uint *src = (uint *) im.scanLine(y);
for (int x=0; x<im.width(); ++x)
dst[x] = qAlpha(src[x]);
}
return indexed;
}
void QFontEngine::removeGlyphFromCache(glyph_t)
{
}
QFontEngine::Properties QFontEngine::properties() const
{
Properties p;
QByteArray psname = QFontEngine::convertToPostscriptFontFamilyName(fontDef.family.toUtf8());
psname += '-';
psname += QByteArray::number(fontDef.style);
psname += '-';
psname += QByteArray::number(fontDef.weight);
p.postscriptName = psname;
p.ascent = ascent();
p.descent = descent();
p.leading = leading();
p.emSquare = p.ascent;
p.boundingBox = QRectF(0, -p.ascent.toReal(), maxCharWidth(), (p.ascent + p.descent).toReal());
p.italicAngle = 0;
p.capHeight = p.ascent;
p.lineWidth = lineThickness();
return p;
}
void QFontEngine::getUnscaledGlyph(glyph_t glyph, QPainterPath *path, glyph_metrics_t *metrics)
{
*metrics = boundingBox(glyph);
QFixedPoint p;
p.x = 0;
p.y = 0;
addGlyphsToPath(&glyph, &p, 1, path, QFlag(0));
}
QByteArray QFontEngine::getSfntTable(uint tag) const
{
QByteArray table;
uint len = 0;
if (!getSfntTableData(tag, 0, &len))
return table;
if (!len)
return table;
table.resize(len);
if (!getSfntTableData(tag, reinterpret_cast<uchar *>(table.data()), &len))
return QByteArray();
return table;
}
void QFontEngine::clearGlyphCache(const void *key)
{
for (QLinkedList<GlyphCacheEntry>::iterator it = m_glyphCaches.begin(), end = m_glyphCaches.end(); it != end; ) {
if (it->context == key)
it = m_glyphCaches.erase(it);
else
++it;
}
}
void QFontEngine::setGlyphCache(const void *key, QFontEngineGlyphCache *data)
{
Q_ASSERT(data);
GlyphCacheEntry entry;
entry.context = key;
entry.cache = data;
if (m_glyphCaches.contains(entry))
return;
// Limit the glyph caches to 4. This covers all 90 degree rotations and limits
// memory use when there is continuous or random rotation
if (m_glyphCaches.size() == 4)
m_glyphCaches.removeLast();
m_glyphCaches.push_front(entry);
}
QFontEngineGlyphCache *QFontEngine::glyphCache(const void *key, QFontEngineGlyphCache::Type type, const QTransform &transform) const
{
for (QLinkedList<GlyphCacheEntry>::const_iterator it = m_glyphCaches.constBegin(), end = m_glyphCaches.constEnd(); it != end; ++it) {
QFontEngineGlyphCache *c = it->cache.data();
if (key == it->context
&& type == c->cacheType()
&& qtransform_equals_no_translate(c->m_transform, transform)) {
return c;
}
}
return 0;
}
static inline QFixed kerning(int left, int right, const QFontEngine::KernPair *pairs, int numPairs)
{
uint left_right = (left << 16) + right;
left = 0, right = numPairs - 1;
while (left <= right) {
int middle = left + ( ( right - left ) >> 1 );
if(pairs[middle].left_right == left_right)
return pairs[middle].adjust;
if (pairs[middle].left_right < left_right)
left = middle + 1;
else
right = middle - 1;
}
return 0;
}
void QFontEngine::doKerning(QGlyphLayout *glyphs, QFontEngine::ShaperFlags flags) const
{
int numPairs = kerning_pairs.size();
if(!numPairs)
return;
const KernPair *pairs = kerning_pairs.constData();
if (flags & DesignMetrics) {
for(int i = 0; i < glyphs->numGlyphs - 1; ++i)
glyphs->advances[i] += kerning(glyphs->glyphs[i], glyphs->glyphs[i+1] , pairs, numPairs);
} else {
for(int i = 0; i < glyphs->numGlyphs - 1; ++i)
glyphs->advances[i] += qRound(kerning(glyphs->glyphs[i], glyphs->glyphs[i+1] , pairs, numPairs));
}
}
void QFontEngine::loadKerningPairs(QFixed scalingFactor)
{
kerning_pairs.clear();
QByteArray tab = getSfntTable(MAKE_TAG('k', 'e', 'r', 'n'));
if (tab.isEmpty())
return;
const uchar *table = reinterpret_cast<const uchar *>(tab.constData());
unsigned short version = qFromBigEndian<quint16>(table);
if (version != 0) {
// qDebug("wrong version");
return;
}
unsigned short numTables = qFromBigEndian<quint16>(table + 2);
{
int offset = 4;
for(int i = 0; i < numTables; ++i) {
if (offset + 6 > tab.size()) {
// qDebug("offset out of bounds");
goto end;
}
const uchar *header = table + offset;
ushort version = qFromBigEndian<quint16>(header);
ushort length = qFromBigEndian<quint16>(header+2);
ushort coverage = qFromBigEndian<quint16>(header+4);
// qDebug("subtable: version=%d, coverage=%x",version, coverage);
if(version == 0 && coverage == 0x0001) {
if (offset + length > tab.size()) {
// qDebug("length ouf ot bounds");
goto end;
}
const uchar *data = table + offset + 6;
ushort nPairs = qFromBigEndian<quint16>(data);
if(nPairs * 6 + 8 > length - 6) {
// qDebug("corrupt table!");
// corrupt table
goto end;
}
int off = 8;
for(int i = 0; i < nPairs; ++i) {
QFontEngine::KernPair p;
p.left_right = (((uint)qFromBigEndian<quint16>(data+off)) << 16) + qFromBigEndian<quint16>(data+off+2);
p.adjust = QFixed(((int)(short)qFromBigEndian<quint16>(data+off+4))) / scalingFactor;
kerning_pairs.append(p);
off += 6;
}
}
offset += length;
}
}
end:
std::sort(kerning_pairs.begin(), kerning_pairs.end());
// for (int i = 0; i < kerning_pairs.count(); ++i)
// qDebug() << 'i' << i << "left_right" << hex << kerning_pairs.at(i).left_right;
}
int QFontEngine::glyphCount() const
{
QByteArray maxpTable = getSfntTable(MAKE_TAG('m', 'a', 'x', 'p'));
if (maxpTable.size() < 6)
return 0;
return qFromBigEndian<quint16>(reinterpret_cast<const uchar *>(maxpTable.constData() + 4));
}
const uchar *QFontEngine::getCMap(const uchar *table, uint tableSize, bool *isSymbolFont, int *cmapSize)
{
const uchar *header = table;
if (tableSize < 4)
return 0;
const uchar *endPtr = table + tableSize;
// version check
if (qFromBigEndian<quint16>(header) != 0)
return 0;
unsigned short numTables = qFromBigEndian<quint16>(header + 2);
const uchar *maps = table + 4;
if (maps + 8 * numTables > endPtr)
return 0;
enum {
Invalid,
AppleRoman,
Symbol,
Unicode11,
Unicode,
MicrosoftUnicode,
MicrosoftUnicodeExtended
};
int symbolTable = -1;
int tableToUse = -1;
int score = Invalid;
for (int n = 0; n < numTables; ++n) {
const quint16 platformId = qFromBigEndian<quint16>(maps + 8 * n);
const quint16 platformSpecificId = qFromBigEndian<quint16>(maps + 8 * n + 2);
switch (platformId) {
case 0: // Unicode
if (score < Unicode &&
(platformSpecificId == 0 ||
platformSpecificId == 2 ||
platformSpecificId == 3)) {
tableToUse = n;
score = Unicode;
} else if (score < Unicode11 && platformSpecificId == 1) {
tableToUse = n;
score = Unicode11;
}
break;
case 1: // Apple
if (score < AppleRoman && platformSpecificId == 0) { // Apple Roman
tableToUse = n;
score = AppleRoman;
}
break;
case 3: // Microsoft
switch (platformSpecificId) {
case 0:
symbolTable = n;
if (score < Symbol) {
tableToUse = n;
score = Symbol;
}
break;
case 1:
if (score < MicrosoftUnicode) {
tableToUse = n;
score = MicrosoftUnicode;
}
break;
case 0xa:
if (score < MicrosoftUnicodeExtended) {
tableToUse = n;
score = MicrosoftUnicodeExtended;
}
break;
default:
break;
}
default:
break;
}
}
if(tableToUse < 0)
return 0;
resolveTable:
*isSymbolFont = (symbolTable > -1);
unsigned int unicode_table = qFromBigEndian<quint32>(maps + 8*tableToUse + 4);
if (!unicode_table || unicode_table + 8 > tableSize)
return 0;
// get the header of the unicode table
header = table + unicode_table;
unsigned short format = qFromBigEndian<quint16>(header);
unsigned int length;
if(format < 8)
length = qFromBigEndian<quint16>(header + 2);
else
length = qFromBigEndian<quint32>(header + 4);
if (table + unicode_table + length > endPtr)
return 0;
*cmapSize = length;
// To support symbol fonts that contain a unicode table for the symbol area
// we check the cmap tables and fall back to symbol font unless that would
// involve losing information from the unicode table
if (symbolTable > -1 && ((score == Unicode) || (score == Unicode11))) {
const uchar *selectedTable = table + unicode_table;
// Check that none of the latin1 range are in the unicode table
bool unicodeTableHasLatin1 = false;
for (int uc=0x00; uc<0x100; ++uc) {
if (getTrueTypeGlyphIndex(selectedTable, uc) != 0) {
unicodeTableHasLatin1 = true;
break;
}
}
// Check that at least one symbol char is in the unicode table
bool unicodeTableHasSymbols = false;
if (!unicodeTableHasLatin1) {
for (int uc=0xf000; uc<0xf100; ++uc) {
if (getTrueTypeGlyphIndex(selectedTable, uc) != 0) {
unicodeTableHasSymbols = true;
break;
}
}
}
// Fall back to symbol table
if (!unicodeTableHasLatin1 && unicodeTableHasSymbols) {
tableToUse = symbolTable;
score = Symbol;
goto resolveTable;
}
}
return table + unicode_table;
}
quint32 QFontEngine::getTrueTypeGlyphIndex(const uchar *cmap, uint unicode)
{
unsigned short format = qFromBigEndian<quint16>(cmap);
if (format == 0) {
if (unicode < 256)
return (int) *(cmap+6+unicode);
} else if (format == 4) {
/* some fonts come with invalid cmap tables, where the last segment
specified end = start = rangeoffset = 0xffff, delta = 0x0001
Since 0xffff is never a valid Unicode char anyway, we just get rid of the issue
by returning 0 for 0xffff
*/
if(unicode >= 0xffff)
return 0;
quint16 segCountX2 = qFromBigEndian<quint16>(cmap + 6);
const unsigned char *ends = cmap + 14;
int i = 0;
for (; i < segCountX2/2 && qFromBigEndian<quint16>(ends + 2*i) < unicode; i++) {}
const unsigned char *idx = ends + segCountX2 + 2 + 2*i;
quint16 startIndex = qFromBigEndian<quint16>(idx);
if (startIndex > unicode)
return 0;
idx += segCountX2;
qint16 idDelta = (qint16)qFromBigEndian<quint16>(idx);
idx += segCountX2;
quint16 idRangeoffset_t = (quint16)qFromBigEndian<quint16>(idx);
quint16 glyphIndex;
if (idRangeoffset_t) {
quint16 id = qFromBigEndian<quint16>(idRangeoffset_t + 2*(unicode - startIndex) + idx);
if (id)
glyphIndex = (idDelta + id) % 0x10000;
else
glyphIndex = 0;
} else {
glyphIndex = (idDelta + unicode) % 0x10000;
}
return glyphIndex;
} else if (format == 6) {
quint16 tableSize = qFromBigEndian<quint16>(cmap + 2);
quint16 firstCode6 = qFromBigEndian<quint16>(cmap + 6);
if (unicode < firstCode6)
return 0;
quint16 entryCount6 = qFromBigEndian<quint16>(cmap + 8);
if (entryCount6 * 2 + 10 > tableSize)
return 0;
quint16 sentinel6 = firstCode6 + entryCount6;
if (unicode >= sentinel6)
return 0;
quint16 entryIndex6 = unicode - firstCode6;
return qFromBigEndian<quint16>(cmap + 10 + (entryIndex6 * 2));
} else if (format == 12) {
quint32 nGroups = qFromBigEndian<quint32>(cmap + 12);
cmap += 16; // move to start of groups
int left = 0, right = nGroups - 1;
while (left <= right) {
int middle = left + ( ( right - left ) >> 1 );
quint32 startCharCode = qFromBigEndian<quint32>(cmap + 12*middle);
if(unicode < startCharCode)
right = middle - 1;
else {
quint32 endCharCode = qFromBigEndian<quint32>(cmap + 12*middle + 4);
if(unicode <= endCharCode)
return qFromBigEndian<quint32>(cmap + 12*middle + 8) + unicode - startCharCode;
left = middle + 1;
}
}
} else {
qDebug("cmap table of format %d not implemented", format);
}
return 0;
}
QByteArray QFontEngine::convertToPostscriptFontFamilyName(const QByteArray &family)
{
QByteArray f = family;
f.replace(' ', "");
f.replace('(', "");
f.replace(')', "");
f.replace('<', "");
f.replace('>', "");
f.replace('[', "");
f.replace(']', "");
f.replace('{', "");
f.replace('}', "");
f.replace('/', "");
f.replace('%', "");
return f;
}
QFixed QFontEngine::lastRightBearing(const QGlyphLayout &glyphs, bool round)
{
if (glyphs.numGlyphs >= 1) {
glyph_t glyph = glyphs.glyphs[glyphs.numGlyphs - 1];
glyph_metrics_t gi = boundingBox(glyph);
if (gi.isValid())
return round ? QFixed(qRound(gi.xoff - gi.x - gi.width))
: QFixed(gi.xoff - gi.x - gi.width);
}
return 0;
}
// ------------------------------------------------------------------
// The box font engine
// ------------------------------------------------------------------
QFontEngineBox::QFontEngineBox(int size)
: _size(size)
{
cache_cost = sizeof(QFontEngineBox);
}
QFontEngineBox::~QFontEngineBox()
{
}
bool QFontEngineBox::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QFontEngine::ShaperFlags flags) const
{
if (*nglyphs < len) {
*nglyphs = len;
return false;
}
int ucs4Length = 0;
for (int i = 0; i < len; ++i) {
if (str[i].isHighSurrogate() && i + 1 < len && str[i + 1].isLowSurrogate())
++ucs4Length;
++ucs4Length;
}
memset(glyphs->glyphs, 0, ucs4Length * sizeof(glyph_t));
*nglyphs = ucs4Length;
glyphs->numGlyphs = ucs4Length;
if (!(flags & GlyphIndicesOnly))
recalcAdvances(glyphs, flags);
return true;
}
void QFontEngineBox::recalcAdvances(QGlyphLayout *glyphs, QFontEngine::ShaperFlags) const
{
for (int i = 0; i < glyphs->numGlyphs; i++)
glyphs->advances[i] = _size;
}
void QFontEngineBox::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags)
{
if (!glyphs.numGlyphs)
return;
QVarLengthArray<QFixedPoint> positions;
QVarLengthArray<glyph_t> positioned_glyphs;
QTransform matrix = QTransform::fromTranslate(x, y - _size);
getGlyphPositions(glyphs, matrix, flags, positioned_glyphs, positions);
QSize s(_size - 3, _size - 3);
for (int k = 0; k < positions.size(); k++)
path->addRect(QRectF(positions[k].toPointF(), s));
}
glyph_metrics_t QFontEngineBox::boundingBox(const QGlyphLayout &glyphs)
{
glyph_metrics_t overall;
overall.width = _size*glyphs.numGlyphs;
overall.height = _size;
overall.xoff = overall.width;
return overall;
}
void QFontEngineBox::draw(QPaintEngine *p, qreal x, qreal y, const QTextItemInt &ti)
{
if (!ti.glyphs.numGlyphs)
return;
// any fixes here should probably also be done in QPaintEnginePrivate::drawBoxTextItem
QSize s(_size - 3, _size - 3);
QVarLengthArray<QFixedPoint> positions;
QVarLengthArray<glyph_t> glyphs;
QTransform matrix = QTransform::fromTranslate(x, y - _size);
ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
if (glyphs.size() == 0)
return;
QPainter *painter = p->painter();
painter->save();
painter->setBrush(Qt::NoBrush);
QPen pen = painter->pen();
pen.setWidthF(lineThickness().toReal());
painter->setPen(pen);
for (int k = 0; k < positions.size(); k++)
painter->drawRect(QRectF(positions[k].toPointF(), s));
painter->restore();
}
glyph_metrics_t QFontEngineBox::boundingBox(glyph_t)
{
return glyph_metrics_t(0, -_size, _size, _size, _size, 0);
}
QFontEngine *QFontEngineBox::cloneWithSize(qreal pixelSize) const
{
QFontEngineBox *fe = new QFontEngineBox(pixelSize);
return fe;
}
QFixed QFontEngineBox::ascent() const
{
return _size;
}
QFixed QFontEngineBox::descent() const
{
return 0;
}
QFixed QFontEngineBox::leading() const
{
QFixed l = _size * QFixed::fromReal(qreal(0.15));
return l.ceil();
}
qreal QFontEngineBox::maxCharWidth() const
{
return _size;
}
const char *QFontEngineBox::name() const
{
return "null";
}
bool QFontEngineBox::canRender(const QChar *, int)
{
return true;
}
QFontEngine::Type QFontEngineBox::type() const
{
return Box;
}
QImage QFontEngineBox::alphaMapForGlyph(glyph_t)
{
QImage image(_size, _size, QImage::Format_Indexed8);
QVector<QRgb> colors(256);
for (int i=0; i<256; ++i)
colors[i] = qRgba(0, 0, 0, i);
image.setColorTable(colors);
image.fill(0);
// can't use qpainter for index8; so use setPixel to draw our rectangle.
for (int i=2; i <= _size-3; ++i) {
image.setPixel(i, 2, 255);
image.setPixel(i, _size-3, 255);
image.setPixel(2, i, 255);
image.setPixel(_size-3, i, 255);
}
return image;
}
// ------------------------------------------------------------------
// Multi engine
// ------------------------------------------------------------------
static inline uchar highByte(glyph_t glyph)
{ return glyph >> 24; }
// strip high byte from glyph
static inline glyph_t stripped(glyph_t glyph)
{ return glyph & 0x00ffffff; }
QFontEngineMulti::QFontEngineMulti(int engineCount)
{
engines.fill(0, engineCount);
cache_cost = 0;
}
QFontEngineMulti::~QFontEngineMulti()
{
for (int i = 0; i < engines.size(); ++i) {
QFontEngine *fontEngine = engines.at(i);
if (fontEngine && !fontEngine->ref.deref())
delete fontEngine;
}
}
bool QFontEngineMulti::stringToCMap(const QChar *str, int len,
QGlyphLayout *glyphs, int *nglyphs,
QFontEngine::ShaperFlags flags) const
{
if (!engine(0)->stringToCMap(str, len, glyphs, nglyphs, flags))
return false;
const_cast<QFontEngineMulti *>(this)->ensureFallbackFamiliesQueried();
int glyph_pos = 0;
for (int i = 0; i < len; ++i) {
bool surrogate = (str[i].isHighSurrogate() && i < len-1 && str[i+1].isLowSurrogate());
uint ucs4 = surrogate ? QChar::surrogateToUcs4(str[i], str[i+1]) : str[i].unicode();
if (glyphs->glyphs[glyph_pos] == 0 && str[i].category() != QChar::Separator_Line) {
QFixed tmpAdvance;
if (!(flags & GlyphIndicesOnly))
tmpAdvance = glyphs->advances[glyph_pos];
for (int x = 1, n = qMin(engines.size(), 256); x < n; ++x) {
if (engines.at(x) == 0 && !shouldLoadFontEngineForCharacter(x, ucs4))
continue;
QFontEngine *engine = engines.at(x);
if (!engine) {
const_cast<QFontEngineMulti *>(this)->loadEngine(x);
engine = engines.at(x);
}
Q_ASSERT(engine != 0);
if (engine->type() == Box)
continue;
if (!(flags & GlyphIndicesOnly))
glyphs->advances[glyph_pos] = QFixed();
int num = 2;
QGlyphLayout offs = glyphs->mid(glyph_pos, num);
engine->stringToCMap(str + i, surrogate ? 2 : 1, &offs, &num, flags);
Q_ASSERT(num == 1); // surrogates only give 1 glyph
if (glyphs->glyphs[glyph_pos]) {
// set the high byte to indicate which engine the glyph came from
glyphs->glyphs[glyph_pos] |= (x << 24);
break;
}
}
// ensure we use metrics from the 1st font when we use the fallback image.
if (!(flags & GlyphIndicesOnly) && glyphs->glyphs[glyph_pos] == 0)
glyphs->advances[glyph_pos] = tmpAdvance;
}
if (surrogate)
++i;
++glyph_pos;
}
*nglyphs = glyph_pos;
glyphs->numGlyphs = glyph_pos;
return true;
}
bool QFontEngineMulti::shouldLoadFontEngineForCharacter(int at, uint ucs4) const
{
Q_UNUSED(at);
Q_UNUSED(ucs4);
return true;
}
glyph_metrics_t QFontEngineMulti::boundingBox(const QGlyphLayout &glyphs)
{
if (glyphs.numGlyphs <= 0)
return glyph_metrics_t();
glyph_metrics_t overall;
int which = highByte(glyphs.glyphs[0]);
int start = 0;
int end, i;
for (end = 0; end < glyphs.numGlyphs; ++end) {
const int e = highByte(glyphs.glyphs[end]);
if (e == which)
continue;
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
// merge the bounding box for this run
const glyph_metrics_t gm = engine(which)->boundingBox(glyphs.mid(start, end - start));
overall.x = qMin(overall.x, gm.x);
overall.y = qMin(overall.y, gm.y);
overall.width = overall.xoff + gm.width;
overall.height = qMax(overall.height + overall.y, gm.height + gm.y) -
qMin(overall.y, gm.y);
overall.xoff += gm.xoff;
overall.yoff += gm.yoff;
// reset the high byte for all glyphs
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs.glyphs[i] = hi | glyphs.glyphs[i];
// change engine
start = end;
which = e;
}
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
// merge the bounding box for this run
const glyph_metrics_t gm = engine(which)->boundingBox(glyphs.mid(start, end - start));
overall.x = qMin(overall.x, gm.x);
overall.y = qMin(overall.y, gm.y);
overall.width = overall.xoff + gm.width;
overall.height = qMax(overall.height + overall.y, gm.height + gm.y) -
qMin(overall.y, gm.y);
overall.xoff += gm.xoff;
overall.yoff += gm.yoff;
// reset the high byte for all glyphs
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs.glyphs[i] = hi | glyphs.glyphs[i];
return overall;
}
void QFontEngineMulti::getGlyphBearings(glyph_t glyph, qreal *leftBearing, qreal *rightBearing)
{
int which = highByte(glyph);
ensureEngineAt(which);
engine(which)->getGlyphBearings(stripped(glyph), leftBearing, rightBearing);
}
void QFontEngineMulti::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs,
QPainterPath *path, QTextItem::RenderFlags flags)
{
if (glyphs.numGlyphs <= 0)
return;
int which = highByte(glyphs.glyphs[0]);
int start = 0;
int end, i;
if (flags & QTextItem::RightToLeft) {
for (int gl = 0; gl < glyphs.numGlyphs; gl++)
x += glyphs.advances[gl].toReal();
}
for (end = 0; end < glyphs.numGlyphs; ++end) {
const int e = highByte(glyphs.glyphs[end]);
if (e == which)
continue;
if (flags & QTextItem::RightToLeft) {
for (i = start; i < end; ++i)
x -= glyphs.advances[i].toReal();
}
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
engine(which)->addOutlineToPath(x, y, glyphs.mid(start, end - start), path, flags);
// reset the high byte for all glyphs and update x and y
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs.glyphs[i] = hi | glyphs.glyphs[i];
if (!(flags & QTextItem::RightToLeft)) {
for (i = start; i < end; ++i)
x += glyphs.advances[i].toReal();
}
// change engine
start = end;
which = e;
}
if (flags & QTextItem::RightToLeft) {
for (i = start; i < end; ++i)
x -= glyphs.advances[i].toReal();
}
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
engine(which)->addOutlineToPath(x, y, glyphs.mid(start, end - start), path, flags);
// reset the high byte for all glyphs
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs.glyphs[i] = hi | glyphs.glyphs[i];
}
void QFontEngineMulti::recalcAdvances(QGlyphLayout *glyphs, QFontEngine::ShaperFlags flags) const
{
if (glyphs->numGlyphs <= 0)
return;
int which = highByte(glyphs->glyphs[0]);
int start = 0;
int end, i;
for (end = 0; end < glyphs->numGlyphs; ++end) {
const int e = highByte(glyphs->glyphs[end]);
if (e == which)
continue;
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
QGlyphLayout offs = glyphs->mid(start, end - start);
engine(which)->recalcAdvances(&offs, flags);
// reset the high byte for all glyphs and update x and y
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs->glyphs[i] = hi | glyphs->glyphs[i];
// change engine
start = end;
which = e;
}
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
QGlyphLayout offs = glyphs->mid(start, end - start);
engine(which)->recalcAdvances(&offs, flags);
// reset the high byte for all glyphs
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs->glyphs[i] = hi | glyphs->glyphs[i];
}
void QFontEngineMulti::doKerning(QGlyphLayout *glyphs, QFontEngine::ShaperFlags flags) const
{
if (glyphs->numGlyphs <= 0)
return;
int which = highByte(glyphs->glyphs[0]);
int start = 0;
int end, i;
for (end = 0; end < glyphs->numGlyphs; ++end) {
const int e = highByte(glyphs->glyphs[end]);
if (e == which)
continue;
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
QGlyphLayout offs = glyphs->mid(start, end - start);
engine(which)->doKerning(&offs, flags);
// reset the high byte for all glyphs and update x and y
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs->glyphs[i] = hi | glyphs->glyphs[i];
// change engine
start = end;
which = e;
}
// set the high byte to zero
for (i = start; i < end; ++i)
glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
QGlyphLayout offs = glyphs->mid(start, end - start);
engine(which)->doKerning(&offs, flags);
// reset the high byte for all glyphs
const int hi = which << 24;
for (i = start; i < end; ++i)
glyphs->glyphs[i] = hi | glyphs->glyphs[i];
}
glyph_metrics_t QFontEngineMulti::boundingBox(glyph_t glyph)
{
const int which = highByte(glyph);
Q_ASSERT(which < engines.size());
return engine(which)->boundingBox(stripped(glyph));
}
QFixed QFontEngineMulti::ascent() const
{ return engine(0)->ascent(); }
QFixed QFontEngineMulti::descent() const
{ return engine(0)->descent(); }
QFixed QFontEngineMulti::leading() const
{
return engine(0)->leading();
}
QFixed QFontEngineMulti::xHeight() const
{
return engine(0)->xHeight();
}
QFixed QFontEngineMulti::averageCharWidth() const
{
return engine(0)->averageCharWidth();
}
QFixed QFontEngineMulti::lineThickness() const
{
return engine(0)->lineThickness();
}
QFixed QFontEngineMulti::underlinePosition() const
{
return engine(0)->underlinePosition();
}
qreal QFontEngineMulti::maxCharWidth() const
{
return engine(0)->maxCharWidth();
}
qreal QFontEngineMulti::minLeftBearing() const
{
return engine(0)->minLeftBearing();
}
qreal QFontEngineMulti::minRightBearing() const
{
return engine(0)->minRightBearing();
}
bool QFontEngineMulti::canRender(const QChar *string, int len)
{
if (engine(0)->canRender(string, len))
return true;
int nglyphs = len;
QVarLengthArray<glyph_t> glyphs(nglyphs);
QGlyphLayout g;
g.numGlyphs = nglyphs;
g.glyphs = glyphs.data();
if (!stringToCMap(string, len, &g, &nglyphs, GlyphIndicesOnly)) {
glyphs.resize(nglyphs);
g.numGlyphs = nglyphs;
g.glyphs = glyphs.data();
if (!stringToCMap(string, len, &g, &nglyphs, GlyphIndicesOnly))
Q_ASSERT_X(false, Q_FUNC_INFO, "stringToCMap shouldn't fail twice");
}
for (int i = 0; i < nglyphs; i++) {
if (g.glyphs[i] == 0)
return false;
}
return true;
}
/* Implement alphaMapForGlyph() which is called by Lighthouse/Windows code.
* Ideally, that code should be fixed to correctly handle QFontEngineMulti. */
QImage QFontEngineMulti::alphaMapForGlyph(glyph_t glyph)
{
const int which = highByte(glyph);
Q_ASSERT(which < engines.size());
return engine(which)->alphaMapForGlyph(stripped(glyph));
}
QImage QFontEngineMulti::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition)
{
const int which = highByte(glyph);
Q_ASSERT(which < engines.size());
return engine(which)->alphaMapForGlyph(stripped(glyph), subPixelPosition);
}
QImage QFontEngineMulti::alphaMapForGlyph(glyph_t glyph, const QTransform &t)
{
const int which = highByte(glyph);
Q_ASSERT(which < engines.size());
return engine(which)->alphaMapForGlyph(stripped(glyph), t);
}
QImage QFontEngineMulti::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t)
{
const int which = highByte(glyph);
Q_ASSERT(which < engines.size());
return engine(which)->alphaMapForGlyph(stripped(glyph), subPixelPosition, t);
}
QImage QFontEngineMulti::alphaRGBMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t)
{
const int which = highByte(glyph);
Q_ASSERT(which < engines.size());
return engine(which)->alphaRGBMapForGlyph(stripped(glyph), subPixelPosition, t);
}
QTestFontEngine::QTestFontEngine(int size)
: QFontEngineBox(size)
{}
QFontEngine::Type QTestFontEngine::type() const
{
return TestFontEngine;
}
QT_END_NAMESPACE
Reference in New Issue View Git Blame Copy Permalink