source: trunk/src/gui/painting/qtextureglyphcache.cpp@ 890

Last change on this file since 890 was 846, checked in by Dmitry A. Kuminov, 14 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 11.9 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation (qt-info@nokia.com)
6**
7** This file is part of the QtGui module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you have questions regarding the use of this file, please contact
37** Nokia at qt-info@nokia.com.
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include <qmath.h>
43
44#include "qtextureglyphcache_p.h"
45
46#include "private/qnumeric_p.h"
47#include "private/qnativeimage_p.h"
48#include "private/qfontengine_ft_p.h"
49
50QT_BEGIN_NAMESPACE
51
52// #define CACHE_DEBUG
53
54// returns the highest number closest to v, which is a power of 2
55// NB! assumes 32 bit ints
56static inline int qt_next_power_of_two(int v)
57{
58 v--;
59 v |= v >> 1;
60 v |= v >> 2;
61 v |= v >> 4;
62 v |= v >> 8;
63 v |= v >> 16;
64 ++v;
65 return v;
66}
67
68bool QTextureGlyphCache::populate(QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs,
69 const QFixedPoint *)
70{
71#ifdef CACHE_DEBUG
72 printf("Populating with %d glyphs\n", numGlyphs);
73 qDebug() << " -> current transformation: " << m_transform;
74#endif
75
76 m_current_fontengine = fontEngine;
77 const int margin = glyphMargin();
78 const int paddingDoubled = glyphPadding() * 2;
79
80 QHash<glyph_t, Coord> listItemCoordinates;
81 int rowHeight = 0;
82
83 // check each glyph for its metrics and get the required rowHeight.
84 for (int i=0; i < numGlyphs; ++i) {
85 const glyph_t glyph = glyphs[i];
86 if (coords.contains(glyph))
87 continue;
88 if (listItemCoordinates.contains(glyph))
89 continue;
90 glyph_metrics_t metrics = fontEngine->boundingBox(glyph, m_transform);
91
92#ifdef CACHE_DEBUG
93 printf("(%4x): w=%.2f, h=%.2f, xoff=%.2f, yoff=%.2f, x=%.2f, y=%.2f\n",
94 glyph,
95 metrics.width.toReal(),
96 metrics.height.toReal(),
97 metrics.xoff.toReal(),
98 metrics.yoff.toReal(),
99 metrics.x.toReal(),
100 metrics.y.toReal());
101#endif
102 int glyph_width = metrics.width.ceil().toInt();
103 int glyph_height = metrics.height.ceil().toInt();
104 if (glyph_height == 0 || glyph_width == 0)
105 continue;
106 glyph_width += margin * 2 + 4;
107 glyph_height += margin * 2 + 4;
108 // align to 8-bit boundary
109 if (m_type == QFontEngineGlyphCache::Raster_Mono)
110 glyph_width = (glyph_width+7)&~7;
111
112 Coord c = { 0, 0, // will be filled in later
113 glyph_width,
114 glyph_height, // texture coords
115 metrics.x.round().truncate(),
116 -metrics.y.truncate() }; // baseline for horizontal scripts
117
118 listItemCoordinates.insert(glyph, c);
119 rowHeight = qMax(rowHeight, glyph_height);
120 }
121 if (listItemCoordinates.isEmpty())
122 return true;
123
124 rowHeight += margin * 2 + paddingDoubled;
125 if (isNull())
126 createCache(QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH, qt_next_power_of_two(rowHeight));
127
128 // now actually use the coords and paint the wanted glyps into cache.
129 QHash<glyph_t, Coord>::iterator iter = listItemCoordinates.begin();
130 while (iter != listItemCoordinates.end()) {
131 Coord c = iter.value();
132
133 m_currentRowHeight = qMax(m_currentRowHeight, c.h + margin * 2);
134
135 if (m_cx + c.w > m_w) {
136 int new_width = m_w*2;
137 while (new_width < m_cx + c.w)
138 new_width *= 2;
139 if (new_width <= maxTextureWidth()) {
140 resizeTextureData(new_width, m_h);
141 m_w = new_width;
142 } else {
143 // no room on the current line, start new glyph strip
144 m_cx = 0;
145 m_cy += m_currentRowHeight + paddingDoubled;
146 m_currentRowHeight = c.h + margin * 2; // New row
147 }
148 }
149 if (m_cy + c.h > m_h) {
150 int new_height = m_h*2;
151 while (new_height < m_cy + c.h)
152 new_height *= 2;
153
154 if (maxTextureHeight() > 0 && new_height > maxTextureHeight()) {
155 // We can't make a new texture of the required size, so
156 // bail out
157 return false;
158 }
159
160 // if no room in the current texture - realloc a larger texture
161 resizeTextureData(m_w, new_height);
162 m_h = new_height;
163 }
164
165 c.x = m_cx;
166 c.y = m_cy;
167
168 fillTexture(c, iter.key());
169 coords.insert(iter.key(), c);
170
171 m_cx += c.w + paddingDoubled;
172 ++iter;
173 }
174
175 return true;
176}
177
178QImage QTextureGlyphCache::textureMapForGlyph(glyph_t g) const
179{
180#if defined(Q_WS_X11)
181 if (m_transform.type() > QTransform::TxTranslate) {
182 QFontEngineFT::GlyphFormat format = QFontEngineFT::Format_None;
183 QImage::Format imageFormat = QImage::Format_Invalid;
184 switch (m_type) {
185 case Raster_RGBMask:
186 format = QFontEngineFT::Format_A32;
187 imageFormat = QImage::Format_RGB32;
188 break;
189 case Raster_A8:
190 format = QFontEngineFT::Format_A8;
191 imageFormat = QImage::Format_Indexed8;
192 break;
193 case Raster_Mono:
194 format = QFontEngineFT::Format_Mono;
195 imageFormat = QImage::Format_Mono;
196 break;
197 };
198
199 QFontEngineFT *ft = static_cast<QFontEngineFT*> (m_current_fontengine);
200 QFontEngineFT::QGlyphSet *gset = ft->loadTransformedGlyphSet(m_transform);
201
202 if (gset && ft->loadGlyphs(gset, &g, 1, format)) {
203 QFontEngineFT::Glyph *glyph = gset->getGlyph(g);
204 const int bytesPerLine = (format == QFontEngineFT::Format_Mono ? ((glyph->width + 31) & ~31) >> 3
205 : (glyph->width + 3) & ~3);
206 return QImage(glyph->data, glyph->width, glyph->height, bytesPerLine, imageFormat);
207 }
208 } else
209#endif
210 if (m_type == QFontEngineGlyphCache::Raster_RGBMask)
211 return m_current_fontengine->alphaRGBMapForGlyph(g, glyphMargin(), m_transform);
212 else
213 return m_current_fontengine->alphaMapForGlyph(g, m_transform);
214
215 return QImage();
216}
217
218/************************************************************************
219 * QImageTextureGlyphCache
220 */
221
222void QImageTextureGlyphCache::resizeTextureData(int width, int height)
223{
224 m_image = m_image.copy(0, 0, width, height);
225}
226
227void QImageTextureGlyphCache::createTextureData(int width, int height)
228{
229 switch (m_type) {
230 case QFontEngineGlyphCache::Raster_Mono:
231 m_image = QImage(width, height, QImage::Format_Mono);
232 break;
233 case QFontEngineGlyphCache::Raster_A8: {
234 m_image = QImage(width, height, QImage::Format_Indexed8);
235 m_image.fill(0);
236 QVector<QRgb> colors(256);
237 QRgb *it = colors.data();
238 for (int i=0; i<256; ++i, ++it)
239 *it = 0xff000000 | i | (i<<8) | (i<<16);
240 m_image.setColorTable(colors);
241 break; }
242 case QFontEngineGlyphCache::Raster_RGBMask:
243 m_image = QImage(width, height, QImage::Format_RGB32);
244 break;
245 }
246}
247
248int QImageTextureGlyphCache::glyphMargin() const
249{
250#if defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)
251 return 0;
252#else
253 return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
254#endif
255}
256
257void QImageTextureGlyphCache::fillTexture(const Coord &c, glyph_t g)
258{
259 QImage mask = textureMapForGlyph(g);
260
261#ifdef CACHE_DEBUG
262 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());
263 if (mask.width() > c.w || mask.height() > c.h) {
264 printf(" ERROR; mask is bigger than reserved space! %dx%d instead of %dx%d\n", mask.width(), mask.height(), c.w,c.h);
265 return;
266 }
267#endif
268
269 if (m_type == QFontEngineGlyphCache::Raster_RGBMask) {
270 QImage ref(m_image.bits() + (c.x * 4 + c.y * m_image.bytesPerLine()),
271 qMax(mask.width(), c.w), qMax(mask.height(), c.h), m_image.bytesPerLine(),
272 m_image.format());
273 QPainter p(&ref);
274 p.setCompositionMode(QPainter::CompositionMode_Source);
275 p.fillRect(0, 0, c.w, c.h, QColor(0,0,0,0)); // TODO optimize this
276 p.drawImage(0, 0, mask);
277 p.end();
278 } else if (m_type == QFontEngineGlyphCache::Raster_Mono) {
279 if (mask.depth() > 1) {
280 // TODO optimize this
281 mask = mask.alphaChannel();
282 mask.invertPixels();
283 mask = mask.convertToFormat(QImage::Format_Mono);
284 }
285
286 int mw = qMin(mask.width(), c.w);
287 int mh = qMin(mask.height(), c.h);
288 uchar *d = m_image.bits();
289 int dbpl = m_image.bytesPerLine();
290
291 for (int y = 0; y < c.h; ++y) {
292 uchar *dest = d + (c.y + y) *dbpl + c.x/8;
293
294 if (y < mh) {
295 uchar *src = mask.scanLine(y);
296 for (int x = 0; x < c.w/8; ++x) {
297 if (x < (mw+7)/8)
298 dest[x] = src[x];
299 else
300 dest[x] = 0;
301 }
302 } else {
303 for (int x = 0; x < c.w/8; ++x)
304 dest[x] = 0;
305 }
306 }
307 } else { // A8
308 int mw = qMin(mask.width(), c.w);
309 int mh = qMin(mask.height(), c.h);
310 uchar *d = m_image.bits();
311 int dbpl = m_image.bytesPerLine();
312
313 if (mask.depth() == 1) {
314 for (int y = 0; y < c.h; ++y) {
315 uchar *dest = d + (c.y + y) *dbpl + c.x;
316 if (y < mh) {
317 uchar *src = (uchar *) mask.scanLine(y);
318 for (int x = 0; x < c.w; ++x) {
319 if (x < mw)
320 dest[x] = (src[x >> 3] & (1 << (7 - (x & 7)))) > 0 ? 255 : 0;
321 }
322 }
323 }
324 } else if (mask.depth() == 8) {
325 for (int y = 0; y < c.h; ++y) {
326 uchar *dest = d + (c.y + y) *dbpl + c.x;
327 if (y < mh) {
328 uchar *src = (uchar *) mask.scanLine(y);
329 for (int x = 0; x < c.w; ++x) {
330 if (x < mw)
331 dest[x] = src[x];
332 }
333 }
334 }
335 }
336 }
337
338#ifdef CACHE_DEBUG
339// QPainter p(&m_image);
340// p.drawLine(
341 QPoint base(c.x + glyphMargin(), c.y + glyphMargin() + c.baseLineY-1);
342 if (m_image.rect().contains(base))
343 m_image.setPixel(base, 255);
344 m_image.save(QString::fromLatin1("cache-%1.png").arg(int(this)));
345#endif
346}
347
348QT_END_NAMESPACE
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