summaryrefslogtreecommitdiffstats
path: root/src/gui/painting/qoutlinemapper.cpp
blob: 8b607b28b8c235137949fb127a611055b6fc5731 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qoutlinemapper_p.h"
#include <private/qpainterpath_p.h>
#include "qmath.h"

#include <stdlib.h>

QT_BEGIN_NAMESPACE

static const qreal aliasedCoordinateDelta = 0.5 - 0.015625;

#define qreal_to_fixed_26_6(f) (int(f * 64))




static const QRectF boundingRect(const QPointF *points, int pointCount)
{
    const QPointF *e = points;
    const QPointF *last = points + pointCount;
    qreal minx, maxx, miny, maxy;
    minx = maxx = e->x();
    miny = maxy = e->y();
    while (++e < last) {
        if (e->x() < minx)
            minx = e->x();
        else if (e->x() > maxx)
            maxx = e->x();
        if (e->y() < miny)
            miny = e->y();
        else if (e->y() > maxy)
            maxy = e->y();
    }
    return QRectF(QPointF(minx, miny), QPointF(maxx, maxy));
}


QT_FT_Outline *QOutlineMapper::convertPath(const QPainterPath &path)
{
    Q_ASSERT(!path.isEmpty());
    int elmCount = path.elementCount();
#ifdef QT_DEBUG_CONVERT
    printf("QOutlineMapper::convertPath(), size=%d\n", elmCount);
#endif
    beginOutline(path.fillRule());

    for (int index=0; index<elmCount; ++index) {
        const QPainterPath::Element &elm = path.elementAt(index);

        switch (elm.type) {

        case QPainterPath::MoveToElement:
            if (index == elmCount - 1)
                continue;
            moveTo(elm);
            break;

        case QPainterPath::LineToElement:
            lineTo(elm);
            break;

        case QPainterPath::CurveToElement:
            curveTo(elm, path.elementAt(index + 1), path.elementAt(index + 2));
            index += 2;
            break;

        default:
            break; // This will never hit..
        }
    }

    endOutline();
    return outline();
}

QT_FT_Outline *QOutlineMapper::convertPath(const QVectorPath &path)
{
    int count = path.elementCount();

#ifdef QT_DEBUG_CONVERT
    printf("QOutlineMapper::convertPath(VP), size=%d\n", count);
#endif
    beginOutline(path.hasWindingFill() ? Qt::WindingFill : Qt::OddEvenFill);

    if (path.elements()) {
        // TODO: if we do closing of subpaths in convertElements instead we
        // could avoid this loop
        const QPainterPath::ElementType *elements = path.elements();
        const QPointF *points = reinterpret_cast<const QPointF *>(path.points());

        for (int index = 0; index < count; ++index) {
            switch (elements[index]) {
                case QPainterPath::MoveToElement:
                    if (index == count - 1)
                        continue;
                    moveTo(points[index]);
                    break;

                case QPainterPath::LineToElement:
                    lineTo(points[index]);
                    break;

                case QPainterPath::CurveToElement:
                    curveTo(points[index], points[index+1], points[index+2]);
                    index += 2;
                    break;

                default:
                    break; // This will never hit..
            }
        }

    } else {
        // ### We can kill this copying and just use the buffer straight...

        m_elements.resize(count);
        if (count)
            memcpy(m_elements.data(), path.points(), count* sizeof(QPointF));

        m_element_types.resize(0);
    }

    endOutline();
    return outline();
}


void QOutlineMapper::endOutline()
{
    closeSubpath();

    int element_count = m_elements.size();

    if (element_count == 0) {
        memset(&m_outline, 0, sizeof(m_outline));
        return;
    }

    QPointF *elements;

    // Transform the outline
    if (m_txop == QTransform::TxNone) {
        elements = m_elements.data();
    } else {
        if (m_txop == QTransform::TxTranslate) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(e.x() + m_dx, e.y() + m_dy);
            }
        } else if (m_txop == QTransform::TxScale) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(m_m11 * e.x() + m_dx, m_m22 * e.y() + m_dy);
            }
        } else if (m_txop < QTransform::TxProject) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(m_m11 * e.x() + m_m21 * e.y() + m_dx,
                                          m_m22 * e.y() + m_m12 * e.x() + m_dy);
            }
        } else {
            const QVectorPath vp((qreal *)m_elements.data(), m_elements.size(), m_element_types.size() ? m_element_types.data() : 0);
            QPainterPath path = vp.convertToPainterPath();
            path = QTransform(m_m11, m_m12, m_m13, m_m21, m_m22, m_m23, m_dx, m_dy, m_m33).map(path);
            if (!(m_outline.flags & QT_FT_OUTLINE_EVEN_ODD_FILL))
                path.setFillRule(Qt::WindingFill);
            uint old_txop = m_txop;
            m_txop = QTransform::TxNone;
            if (path.isEmpty())
                m_valid = false;
            else
                convertPath(path);
            m_txop = old_txop;
            return;
        }
        elements = m_elements_dev.data();
    }

    if (m_round_coords) {
        // round coordinates to match outlines drawn with drawLine_midpoint_i
        for (int i = 0; i < m_elements.size(); ++i)
            elements[i] = QPointF(qFloor(elements[i].x() + aliasedCoordinateDelta),
                                  qFloor(elements[i].y() + aliasedCoordinateDelta));
    }

    controlPointRect = boundingRect(elements, element_count);

#ifdef QT_DEBUG_CONVERT
    printf(" - control point rect (%.2f, %.2f) %.2f x %.2f, clip=(%d,%d, %dx%d)\n",
           controlPointRect.x(), controlPointRect.y(),
           controlPointRect.width(), controlPointRect.height(),
           m_clip_rect.x(), m_clip_rect.y(), m_clip_rect.width(), m_clip_rect.height());
#endif


    // Check for out of dev bounds...
    const bool do_clip = !m_in_clip_elements && ((controlPointRect.left() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.right() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.top() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.bottom() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.width() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.height() > QT_RASTER_COORD_LIMIT));

    if (do_clip) {
        clipElements(elements, elementTypes(), element_count);
    } else {
        convertElements(elements, elementTypes(), element_count);
    }
}

void QOutlineMapper::convertElements(const QPointF *elements,
                                       const QPainterPath::ElementType *types,
                                       int element_count)
{

    if (types) {
        // Translate into FT coords
        const QPointF *e = elements;
        for (int i=0; i<element_count; ++i) {
            switch (*types) {
            case QPainterPath::MoveToElement:
                {
                    QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),
                                              qreal_to_fixed_26_6(e->y()) };
                    if (i != 0)
                        m_contours << m_points.size() - 1;
                    m_points << pt_fixed;
                    m_tags <<  QT_FT_CURVE_TAG_ON;
                }
                break;

            case QPainterPath::LineToElement:
                {
                    QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),
                                              qreal_to_fixed_26_6(e->y()) };
                    m_points << pt_fixed;
                    m_tags << QT_FT_CURVE_TAG_ON;
                }
                break;

            case QPainterPath::CurveToElement:
                {
                    QT_FT_Vector cp1_fixed = { qreal_to_fixed_26_6(e->x()),
                                               qreal_to_fixed_26_6(e->y()) };
                    ++e;
                    QT_FT_Vector cp2_fixed = { qreal_to_fixed_26_6((e)->x()),
                                               qreal_to_fixed_26_6((e)->y()) };
                    ++e;
                    QT_FT_Vector ep_fixed = { qreal_to_fixed_26_6((e)->x()),
                                              qreal_to_fixed_26_6((e)->y()) };

                    m_points << cp1_fixed << cp2_fixed << ep_fixed;
                    m_tags << QT_FT_CURVE_TAG_CUBIC
                           << QT_FT_CURVE_TAG_CUBIC
                           << QT_FT_CURVE_TAG_ON;

                    types += 2;
                    i += 2;
                }
                break;
            default:
                break;
            }
            ++types;
            ++e;
        }
    } else {
        // Plain polygon...
        const QPointF *last = elements + element_count;
        const QPointF *e = elements;
        while (e < last) {
            QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),
                                      qreal_to_fixed_26_6(e->y()) };
            m_points << pt_fixed;
            m_tags << QT_FT_CURVE_TAG_ON;
            ++e;
        }
    }

    // close the very last subpath
    m_contours << m_points.size() - 1;

    m_outline.n_contours = m_contours.size();
    m_outline.n_points = m_points.size();

    m_outline.points = m_points.data();
    m_outline.tags = m_tags.data();
    m_outline.contours = m_contours.data();

#ifdef QT_DEBUG_CONVERT
    printf("QOutlineMapper::endOutline\n");

    printf(" - contours: %d\n", m_outline.n_contours);
    for (int i=0; i<m_outline.n_contours; ++i) {
        printf("   - %d\n", m_outline.contours[i]);
    }

    printf(" - points: %d\n", m_outline.n_points);
    for (int i=0; i<m_outline.n_points; ++i) {
        printf("   - %d -- %.2f, %.2f, (%d, %d)\n", i,
               (double) (m_outline.points[i].x / 64.0),
               (double) (m_outline.points[i].y / 64.0),
               (int) m_outline.points[i].x, (int) m_outline.points[i].y);
    }
#endif
}

void QOutlineMapper::clipElements(const QPointF *elements,
                                    const QPainterPath::ElementType *types,
                                    int element_count)
{
    // We could save a bit of time by actually implementing them fully
    // instead of going through convenience functionallity, but since
    // this part of code hardly every used, it shouldn't matter.

    m_in_clip_elements = true;

    QPainterPath path;

    if (!(m_outline.flags & QT_FT_OUTLINE_EVEN_ODD_FILL))
        path.setFillRule(Qt::WindingFill);

    if (types) {
        for (int i=0; i<element_count; ++i) {
            switch (types[i]) {
            case QPainterPath::MoveToElement:
                path.moveTo(elements[i]);
                break;

            case QPainterPath::LineToElement:
                path.lineTo(elements[i]);
                break;

            case QPainterPath::CurveToElement:
                path.cubicTo(elements[i], elements[i+1], elements[i+2]);
                i += 2;
                break;
            default:
                break;
            }
        }
    } else {
        path.moveTo(elements[0]);
        for (int i=1; i<element_count; ++i)
            path.lineTo(elements[i]);
    }

    QPainterPath clipPath;
    clipPath.addRect(m_clip_rect);
    QPainterPath clippedPath = path.intersected(clipPath);
    uint old_txop = m_txop;
    m_txop = QTransform::TxNone;
    if (clippedPath.isEmpty())
        m_valid = false;
    else
        convertPath(clippedPath);
    m_txop = old_txop;

    m_in_clip_elements = false;
}

QT_END_NAMESPACE