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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 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 http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <qmath.h>
#include "qtextureglyphcache_p.h"
#include "private/qnumeric_p.h"
#include "private/qnativeimage_p.h"
#include "private/qfontengine_ft_p.h"
QT_BEGIN_NAMESPACE
// #define CACHE_DEBUG
void QTextureGlyphCache::populate(const QTextItemInt &ti,
const QVarLengthArray<glyph_t> &glyphs,
const QVarLengthArray<QFixedPoint> &)
{
#ifdef CACHE_DEBUG
printf("Populating with '%s'\n", QString::fromRawData(ti.chars, ti.num_chars).toLatin1().data());
qDebug() << " -> current transformation: " << m_transform;
#endif
m_current_textitem = &ti;
const int margin = glyphMargin();
QHash<glyph_t, Coord> listItemCoordinates;
int rowHeight = 0;
// check each glyph for its metrics and get the required rowHeight.
for (int i=0; i < glyphs.size(); ++i) {
const glyph_t glyph = glyphs[i];
if (coords.contains(glyph))
continue;
if (listItemCoordinates.contains(glyph))
continue;
glyph_metrics_t metrics = ti.fontEngine->boundingBox(glyph, m_transform);
#ifdef CACHE_DEBUG
printf("'%c' (%4x): w=%.2f, h=%.2f, xoff=%.2f, yoff=%.2f, x=%.2f, y=%.2f, ti.ascent=%.2f, ti.descent=%.2f\n",
ti.chars[i].toLatin1(),
glyph,
metrics.width.toReal(),
metrics.height.toReal(),
metrics.xoff.toReal(),
metrics.yoff.toReal(),
metrics.x.toReal(),
metrics.y.toReal(),
ti.ascent.toReal(),
ti.descent.toReal());
#endif
int glyph_width = metrics.width.ceil().toInt();
int glyph_height = metrics.height.ceil().toInt();
if (glyph_height == 0 || glyph_width == 0)
continue;
glyph_width += margin * 2 + 4;
glyph_height += margin * 2 + 4;
// align to 8-bit boundary
if (m_type == QFontEngineGlyphCache::Raster_Mono)
glyph_width = (glyph_width+7)&~7;
Coord c = { 0, 0, // will be filled in later
glyph_width,
glyph_height, // texture coords
metrics.x.truncate(),
-metrics.y.truncate() }; // baseline for horizontal scripts
listItemCoordinates.insert(glyph, c);
rowHeight = qMax(rowHeight, glyph_height);
}
if (listItemCoordinates.isEmpty())
return;
rowHeight += margin * 2;
if (isNull())
createCache(256, rowHeight);
// now actually use the coords and paint the wanted glyps into cache.
QHash<glyph_t, Coord>::iterator iter = listItemCoordinates.begin();
while (iter != listItemCoordinates.end()) {
Coord c = iter.value();
if (m_cx + c.w > m_w) {
// no room on the current line, start new glyph strip
m_cx = 0;
m_cy = m_h;
}
if (m_cy + c.h > m_h) {
int new_height;
if (m_cx == 0) { // add a whole row
new_height = m_h + rowHeight;
m_cy = m_h;
} else { // just extend row
new_height = m_cy + rowHeight;
}
// if no room in the current texture - realloc a larger texture
resizeTextureData(m_w, new_height);
m_h = new_height;
}
c.x = m_cx;
c.y = m_cy;
fillTexture(c, iter.key());
coords.insert(iter.key(), c);
if (m_cx + c.w > m_w) {
m_cx = 0;
m_cy += rowHeight;
} else {
// for the Mono case, glyph_width is 8-bit aligned,
// and therefore so will m_cx
m_cx += c.w;
}
++iter;
}
}
QImage QTextureGlyphCache::textureMapForGlyph(glyph_t g) const
{
#if defined(Q_WS_X11)
if (m_transform.type() > QTransform::TxTranslate) {
QFontEngineFT::GlyphFormat format = QFontEngineFT::Format_None;
QImage::Format imageFormat = QImage::Format_Invalid;
switch (m_type) {
case Raster_RGBMask:
format = QFontEngineFT::Format_A32;
imageFormat = QImage::Format_RGB32;
break;
case Raster_A8:
format = QFontEngineFT::Format_A8;
imageFormat = QImage::Format_Indexed8;
break;
case Raster_Mono:
format = QFontEngineFT::Format_Mono;
imageFormat = QImage::Format_Mono;
break;
};
QFontEngineFT *ft = static_cast<QFontEngineFT*> (m_current_textitem->fontEngine);
QFontEngineFT::QGlyphSet *gset = ft->loadTransformedGlyphSet(m_transform);
if (gset && ft->loadGlyphs(gset, &g, 1, format)) {
QFontEngineFT::Glyph *glyph = gset->glyph_data.value(g);
const int bytesPerLine = (format == QFontEngineFT::Format_Mono ? ((glyph->width + 31) & ~31) >> 3
: (glyph->width + 3) & ~3);
return QImage(glyph->data, glyph->width, glyph->height, bytesPerLine, imageFormat);
}
} else
#endif
if (m_type == QFontEngineGlyphCache::Raster_RGBMask)
return m_current_textitem->fontEngine->alphaRGBMapForGlyph(g, glyphMargin(), m_transform);
else
return m_current_textitem->fontEngine->alphaMapForGlyph(g, m_transform);
return QImage();
}
/************************************************************************
* QImageTextureGlyphCache
*/
void QImageTextureGlyphCache::resizeTextureData(int width, int height)
{
m_image = m_image.copy(0, 0, width, height);
}
void QImageTextureGlyphCache::createTextureData(int width, int height)
{
switch (m_type) {
case QFontEngineGlyphCache::Raster_Mono:
m_image = QImage(width, height, QImage::Format_Mono);
break;
case QFontEngineGlyphCache::Raster_A8: {
m_image = QImage(width, height, QImage::Format_Indexed8);
m_image.fill(0);
QVector<QRgb> colors(256);
QRgb *it = colors.data();
for (int i=0; i<256; ++i, ++it)
*it = 0xff000000 | i | (i<<8) | (i<<16);
m_image.setColorTable(colors);
break; }
case QFontEngineGlyphCache::Raster_RGBMask:
m_image = QImage(width, height, QImage::Format_RGB32);
break;
}
}
int QImageTextureGlyphCache::glyphMargin() const
{
#ifdef Q_WS_MAC
return 2;
#else
return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
#endif
}
void QImageTextureGlyphCache::fillTexture(const Coord &c, glyph_t g)
{
QImage mask = textureMapForGlyph(g);
#ifdef CACHE_DEBUG
printf("fillTexture of %dx%d at %d,%d in the cache of %dx%d\n", c.w, c.h, c.x, c.y, m_image.width(), m_image.height());
if (mask.width() > c.w || mask.height() > c.h) {
printf(" ERROR; mask is bigger than reserved space! %dx%d instead of %dx%d\n", mask.width(), mask.height(), c.w,c.h);
return;
}
#endif
if (m_type == QFontEngineGlyphCache::Raster_RGBMask) {
QPainter p(&m_image);
p.setCompositionMode(QPainter::CompositionMode_Source);
p.fillRect(c.x, c.y, c.w, c.h, QColor(0,0,0,0)); // TODO optimize this
p.drawImage(c.x, c.y, mask);
p.end();
} else if (m_type == QFontEngineGlyphCache::Raster_Mono) {
if (mask.depth() > 1) {
// TODO optimize this
mask = mask.alphaChannel();
mask.invertPixels();
mask = mask.convertToFormat(QImage::Format_Mono);
}
int mw = qMin(mask.width(), c.w);
int mh = qMin(mask.height(), c.h);
uchar *d = m_image.bits();
int dbpl = m_image.bytesPerLine();
for (int y = 0; y < c.h; ++y) {
uchar *dest = d + (c.y + y) *dbpl + c.x/8;
if (y < mh) {
uchar *src = mask.scanLine(y);
for (int x = 0; x < c.w/8; ++x) {
if (x < (mw+7)/8)
dest[x] = src[x];
else
dest[x] = 0;
}
} else {
for (int x = 0; x < c.w/8; ++x)
dest[x] = 0;
}
}
} else { // A8
int mw = qMin(mask.width(), c.w);
int mh = qMin(mask.height(), c.h);
uchar *d = m_image.bits();
int dbpl = m_image.bytesPerLine();
if (mask.depth() == 1) {
for (int y = 0; y < c.h; ++y) {
uchar *dest = d + (c.y + y) *dbpl + c.x;
if (y < mh) {
uchar *src = (uchar *) mask.scanLine(y);
for (int x = 0; x < c.w; ++x) {
if (x < mw)
dest[x] = (src[x >> 3] & (1 << (7 - (x & 7)))) > 0 ? 255 : 0;
}
}
}
} else if (mask.depth() == 8) {
for (int y = 0; y < c.h; ++y) {
uchar *dest = d + (c.y + y) *dbpl + c.x;
if (y < mh) {
uchar *src = (uchar *) mask.scanLine(y);
for (int x = 0; x < c.w; ++x) {
if (x < mw)
dest[x] = src[x];
}
}
}
}
}
#ifdef CACHE_DEBUG
// QPainter p(&m_image);
// p.drawLine(
QPoint base(c.x + glyphMargin(), c.y + glyphMargin() + c.baseLineY-1);
if (m_image.rect().contains(base))
m_image.setPixel(base, 255);
m_image.save(QString::fromLatin1("cache-%1-%2-%3.png")
.arg(m_current_textitem->font().family())
.arg(m_current_textitem->font().pointSize())
.arg(m_transform.type()));
#endif
}
QT_END_NAMESPACE
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