1// Copyright (C) 2023 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "qsvgfilter_p.h"
5
6#include "qsvgnode_p.h"
7#include "qsvgtinydocument_p.h"
8#include "qpainter.h"
9
10#include <QLoggingCategory>
11#include <QtGui/qimageiohandler.h>
12#include <QVector4D>
13
14QT_BEGIN_NAMESPACE
15
16Q_DECLARE_LOGGING_CATEGORY(lcSvgDraw);
17
18QSvgFeFilterPrimitive::QSvgFeFilterPrimitive(QSvgNode *parent, QString input, QString result,
19 const QSvgRectF &rect)
20 : QSvgStructureNode(parent)
21 , m_input(input)
22 , m_result(result)
23 , m_rect(rect)
24{
25
26}
27
28bool QSvgFeFilterPrimitive::shouldDrawNode(QPainter *, QSvgExtraStates &) const
29{
30 return false;
31}
32
33QRectF QSvgFeFilterPrimitive::localSubRegion(const QRectF &itemBounds, const QRectF &filterBounds,
34 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes) const
35{
36 // 15.7.3 Filter primitive subregion
37 // https://www.w3.org/TR/SVG11/filters.html#FilterPrimitiveSubRegion
38
39 QRectF clipRect = m_rect.resolveRelativeLengths(localRect: itemBounds, units: primitiveUnits);
40
41 // the default subregion is 0%,0%,100%,100%, where as a special-case the percentages are
42 // relative to the dimensions of the filter region, thus making the the default filter primitive
43 // subregion equal to the filter region.
44 if (m_rect.unitX() == QtSvg::UnitTypes::unknown)
45 clipRect.setX(filterBounds.x());
46 if (m_rect.unitY() == QtSvg::UnitTypes::unknown)
47 clipRect.setY(filterBounds.y());
48 if (m_rect.unitW() == QtSvg::UnitTypes::unknown)
49 clipRect.setWidth(filterBounds.width());
50 if (m_rect.unitH() == QtSvg::UnitTypes::unknown)
51 clipRect.setHeight(filterBounds.height());
52
53 clipRect = clipRect.intersected(r: filterBounds);
54
55 return clipRect;
56}
57
58QRectF QSvgFeFilterPrimitive::globalSubRegion(QPainter *p,
59 const QRectF &itemBounds, const QRectF &filterBounds,
60 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes filterUnits) const
61{
62 return p->transform().mapRect(localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits));
63}
64
65void QSvgFeFilterPrimitive::clipToTransformedBounds(QImage *buffer, QPainter *p, const QRectF &localRect) const
66{
67 QPainter painter(buffer);
68 painter.setRenderHints(hints: p->renderHints());
69 painter.translate(offset: -buffer->offset());
70 QPainterPath clipPath;
71 clipPath.setFillRule(Qt::OddEvenFill);
72 clipPath.addRect(rect: QRect(buffer->offset(), buffer->size()).adjusted(xp1: -10, yp1: -10, xp2: 20, yp2: 20));
73 clipPath.addPolygon(polygon: p->transform().map(a: QPolygonF(localRect)));
74 painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
75 painter.fillPath(path: clipPath, brush: Qt::transparent);
76}
77
78bool QSvgFeFilterPrimitive::requiresSourceAlpha() const
79{
80 return m_input == QLatin1StringView("SourceAlpha");
81}
82
83const QSvgFeFilterPrimitive *QSvgFeFilterPrimitive::castToFilterPrimitive(const QSvgNode *node)
84{
85 if (node->type() == QSvgNode::FeMerge ||
86 node->type() == QSvgNode::FeColormatrix ||
87 node->type() == QSvgNode::FeGaussianblur ||
88 node->type() == QSvgNode::FeOffset ||
89 node->type() == QSvgNode::FeComposite ||
90 node->type() == QSvgNode::FeFlood ) {
91 return reinterpret_cast<const QSvgFeFilterPrimitive*>(node);
92 } else {
93 return nullptr;
94 }
95}
96
97QSvgFeColorMatrix::QSvgFeColorMatrix(QSvgNode *parent, QString input, QString result, const QSvgRectF &rect,
98 ColorShiftType type, Matrix matrix)
99 : QSvgFeFilterPrimitive(parent, input, result, rect)
100 , m_type(type)
101 , m_matrix(matrix)
102{
103 (void)m_type;
104 //Magic numbers see SVG 1.1(Second edition)
105 if (type == ColorShiftType::Saturate) {
106 qreal s = qBound(min: 0., val: matrix.data()[0], max: 1.);
107
108 m_matrix.fill(value: 0);
109
110 m_matrix.data()[0+0*5] = 0.213f + 0.787f * s;
111 m_matrix.data()[1+0*5] = 0.715f - 0.717f * s;
112 m_matrix.data()[2+0*5] = 0.072f - 0.072f * s;
113
114 m_matrix.data()[0+1*5] = 0.213f - 0.213f * s;
115 m_matrix.data()[1+1*5] = 0.715f + 0.285f * s;
116 m_matrix.data()[2+1*5] = 0.072f - 0.072f * s;
117
118 m_matrix.data()[0+2*5] = 0.213f - 0.213f * s;
119 m_matrix.data()[1+2*5] = 0.715f - 0.715f * s;
120 m_matrix.data()[2+2*5] = 0.072f + 0.928f * s;
121
122 m_matrix.data()[3+3*5] = 1;
123
124 } else if (type == ColorShiftType::HueRotate){
125 qreal angle = matrix.data()[0]/180.*M_PI;
126 qreal s = sin(x: angle);
127 qreal c = cos(x: angle);
128
129 m_matrix.fill(value: 0);
130
131 QMatrix3x3 m1;
132 m1.data()[0+0*3] = 0.213f;
133 m1.data()[1+0*3] = 0.715f;
134 m1.data()[2+0*3] = 0.072f;
135
136 m1.data()[0+1*3] = 0.213f;
137 m1.data()[1+1*3] = 0.715f;
138 m1.data()[2+1*3] = 0.072f;
139
140 m1.data()[0+2*3] = 0.213f;
141 m1.data()[1+2*3] = 0.715f;
142 m1.data()[2+2*3] = 0.072f;
143
144 QMatrix3x3 m2;
145 m2.data()[0+0*3] = 0.787 * c;
146 m2.data()[1+0*3] = -0.715 * c;
147 m2.data()[2+0*3] = -0.072 * c;
148
149 m2.data()[0+1*3] = -0.213 * c;
150 m2.data()[1+1*3] = 0.285 * c;
151 m2.data()[2+1*3] = -0.072 * c;
152
153 m2.data()[0+2*3] = -0.213 * c;
154 m2.data()[1+2*3] = -0.715 * c;
155 m2.data()[2+2*3] = 0.928 * c;
156
157 QMatrix3x3 m3;
158 m3.data()[0+0*3] = -0.213 * s;
159 m3.data()[1+0*3] = -0.715 * s;
160 m3.data()[2+0*3] = 0.928 * s;
161
162 m3.data()[0+1*3] = 0.143 * s;
163 m3.data()[1+1*3] = 0.140 * s;
164 m3.data()[2+1*3] = -0.283 * s;
165
166 m3.data()[0+2*3] = -0.787 * s;
167 m3.data()[1+2*3] = 0.715 * s;
168 m3.data()[2+2*3] = 0.072 * s;
169
170 QMatrix3x3 m = m1 + m2 + m3;
171
172 m_matrix.data()[0+0*5] = m.data()[0+0*3];
173 m_matrix.data()[1+0*5] = m.data()[1+0*3];
174 m_matrix.data()[2+0*5] = m.data()[2+0*3];
175
176 m_matrix.data()[0+1*5] = m.data()[0+1*3];
177 m_matrix.data()[1+1*5] = m.data()[1+1*3];
178 m_matrix.data()[2+1*5] = m.data()[2+1*3];
179
180 m_matrix.data()[0+2*5] = m.data()[0+2*3];
181 m_matrix.data()[1+2*5] = m.data()[1+2*3];
182 m_matrix.data()[2+2*5] = m.data()[2+2*3];
183
184 m_matrix.data()[3+3*5] = 1;
185 } else if (type == ColorShiftType::LuminanceToAlpha){
186 m_matrix.fill(value: 0);
187
188 m_matrix.data()[0+3*5] = 0.2125;
189 m_matrix.data()[1+3*5] = 0.7154;
190 m_matrix.data()[2+3*5] = 0.0721;
191 }
192}
193
194QSvgNode::Type QSvgFeColorMatrix::type() const
195{
196 return QSvgNode::FeColormatrix;
197}
198
199QImage QSvgFeColorMatrix::apply(const QMap<QString, QImage> &sources, QPainter *p,
200 const QRectF &itemBounds, const QRectF &filterBounds,
201 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes filterUnits) const
202{
203 if (!sources.contains(key: m_input))
204 return QImage();
205 QImage source = sources[m_input];
206
207 QRect clipRectGlob = globalSubRegion(p, itemBounds, filterBounds, primitiveUnits, filterUnits).toRect();
208 if (clipRectGlob.isEmpty())
209 return QImage();
210
211 QImage result;
212 if (!QImageIOHandler::allocateImage(size: clipRectGlob.size(), format: QImage::Format_ARGB32_Premultiplied, image: &result)) {
213 qCWarning(lcSvgDraw) << "The requested filter buffer is too big, ignoring";
214 return QImage();
215 }
216 result.setOffset(clipRectGlob.topLeft());
217 result.fill(color: Qt::transparent);
218
219 Q_ASSERT(source.depth() == 32);
220
221 for (int i = 0; i < result.height(); i++) {
222 int sourceI = i - source.offset().y() + result.offset().y();
223
224 if (sourceI < 0 || sourceI >= source.height())
225 continue;
226
227 QRgb *sourceLine = reinterpret_cast<QRgb *>(source.scanLine(sourceI));
228 QRgb *resultLine = reinterpret_cast<QRgb *>(result.scanLine(i));
229
230 for (int j = 0; j < result.width(); j++) {
231 int sourceJ = j - source.offset().x() + result.offset().x();
232
233 if (sourceJ < 0 || sourceJ >= source.width())
234 continue;
235
236 QRgb sourceColor = qUnpremultiply(p: sourceLine[sourceJ]);
237 qreal a = qAlpha(rgb: sourceColor);
238 qreal r = qRed(rgb: sourceColor);
239 qreal g = qGreen(rgb: sourceColor);
240 qreal b = qBlue(rgb: sourceColor);
241
242 qreal r2 = m_matrix.data()[0+0*5] * r +
243 m_matrix.data()[1+0*5] * g +
244 m_matrix.data()[2+0*5] * b +
245 m_matrix.data()[3+0*5] * a +
246 m_matrix.data()[4+0*5] * 255.;
247 qreal g2 = m_matrix.data()[0+1*5] * r +
248 m_matrix.data()[1+1*5] * g +
249 m_matrix.data()[2+1*5] * b +
250 m_matrix.data()[3+1*5] * a +
251 m_matrix.data()[4+1*5] * 255.;
252 qreal b2 = m_matrix.data()[0+2*5] * r +
253 m_matrix.data()[1+2*5] * g +
254 m_matrix.data()[2+2*5] * b +
255 m_matrix.data()[3+2*5] * a +
256 m_matrix.data()[4+2*5] * 255.;
257 qreal a2 = m_matrix.data()[0+3*5] * r +
258 m_matrix.data()[1+3*5] * g +
259 m_matrix.data()[2+3*5] * b +
260 m_matrix.data()[3+3*5] * a +
261 m_matrix.data()[4+3*5] * 255.;
262
263 QRgb rgba = qRgba(r: qBound(min: 0, val: int(r2), max: 255),
264 g: qBound(min: 0, val: int(g2), max: 255),
265 b: qBound(min: 0, val: int(b2), max: 255),
266 a: qBound(min: 0, val: int(a2), max: 255));
267 resultLine[j] = qPremultiply(x: rgba);
268 }
269 }
270
271 clipToTransformedBounds(buffer: &result, p, localRect: localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits));
272 return result;
273}
274
275QSvgFeGaussianBlur::QSvgFeGaussianBlur(QSvgNode *parent, QString input, QString result, const QSvgRectF &rect,
276 qreal stdDeviationX, qreal stdDeviationY, EdgeMode edgemode)
277 : QSvgFeFilterPrimitive(parent, input, result, rect)
278 , m_stdDeviationX(stdDeviationX)
279 , m_stdDeviationY(stdDeviationY)
280 , m_edgemode(edgemode)
281{
282 (void)m_edgemode;
283}
284
285QSvgNode::Type QSvgFeGaussianBlur::type() const
286{
287 return QSvgNode::FeGaussianblur;
288}
289
290QImage QSvgFeGaussianBlur::apply(const QMap<QString, QImage> &sources, QPainter *p,
291 const QRectF &itemBounds, const QRectF &filterBounds,
292 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes filterUnits) const
293{
294 if (!sources.contains(key: m_input))
295 return QImage();
296 QImage source = sources[m_input];
297 Q_ASSERT(source.depth() == 32);
298
299 if (m_stdDeviationX == 0 && m_stdDeviationY == 0)
300 return source;
301
302 const qreal scaleX = qHypot(x: p->transform().m11(), y: p->transform().m21());
303 const qreal scaleY = qHypot(x: p->transform().m12(), y: p->transform().m22());
304
305 qreal sigma_x = scaleX * m_stdDeviationX;
306 qreal sigma_y = scaleY * m_stdDeviationY;
307 if (primitiveUnits == QtSvg::UnitTypes::objectBoundingBox) {
308 sigma_x *= itemBounds.width();
309 sigma_y *= itemBounds.height();
310 }
311
312 constexpr double sd = 3. * M_SQRT1_2 / M_2_SQRTPI; // 3 * sqrt(2 * pi) / 4
313 const int dx = floor(x: sigma_x * sd + 0.5);
314 const int dy = floor(x: sigma_y * sd + 0.5);
315
316 const QTransform scaleXr = QTransform::fromScale(dx: scaleX, dy: scaleY);
317 const QTransform restXr = scaleXr.inverted() * p->transform();
318
319 QRect clipRectGlob = scaleXr.mapRect(localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits)).toRect();
320 if (clipRectGlob.isEmpty())
321 return QImage();
322
323 QImage tempSource;
324 if (!QImageIOHandler::allocateImage(size: clipRectGlob.size(), format: QImage::Format_ARGB32_Premultiplied, image: &tempSource)) {
325 qCWarning(lcSvgDraw) << "The requested filter buffer is too big, ignoring";
326 return QImage();
327 }
328 tempSource.setOffset(clipRectGlob.topLeft());
329 tempSource.fill(color: Qt::transparent);
330 QPainter copyPainter(&tempSource);
331 copyPainter.translate(offset: -tempSource.offset());
332 copyPainter.setTransform(transform: restXr.inverted(), combine: true);
333 copyPainter.drawImage(p: source.offset(), image: source);
334 copyPainter.end();
335
336 QVarLengthArray<uint64_t, 32 * 32> buffer(tempSource.width() * tempSource.height());
337
338 const int sourceHeight = tempSource.height();
339 const int sourceWidth = tempSource.width();
340 QRgb *rawImage = reinterpret_cast<QRgb *>(tempSource.bits());
341
342 // https://www.w3.org/TR/SVG11/filters.html#feGaussianBlurElement:
343 // Three successive box-blurs build a piece-wise quadratic convolution kernel,
344 // which approximates the Gaussian kernel
345 for (int m = 0; m < 3; m++) {
346 for (int col = 0; col < 4 * 8; col += 8 ){
347 // Generating the partial sum of color values from the top left corner
348 // These sums can be combined to yield the partial sum of any rectangular subregion
349 for (int i = 0; i < sourceWidth; i++) {
350 for (int j = 0; j < sourceHeight; j++) {
351 buffer[i + j * sourceWidth] = (rawImage[i + j * sourceWidth] >> col) & 0xff;
352 if (i > 0)
353 buffer[i + j * sourceWidth] += buffer[(i - 1) + j * sourceWidth];
354 if (j > 0)
355 buffer[i + j * sourceWidth] += buffer[i + (j - 1) * sourceWidth];
356 if (i > 0 && j > 0)
357 buffer[i + j * sourceWidth] -= buffer[(i - 1) + (j - 1) * sourceWidth];
358 }
359 }
360
361 // https://www.w3.org/TR/SVG11/filters.html#feGaussianBlurElement:
362 // if d is odd, use three box-blurs of size 'd', centered on the output pixel.
363 // if d is even, two box-blurs of size 'd' (the first one centered on the pixel boundary
364 // between the output pixel and the one to the left, the second one centered on the pixel
365 // boundary between the output pixel and the one to the right) and one box blur of size
366 // 'd+1' centered on the output pixel.
367 auto adjustD = [](int d, int iteration) {
368 d = qMax(a: 1, b: d); // Treat d == 0 just like d == 1
369 std::pair<int, int> result;
370 if (d % 2 == 1)
371 result = {d / 2 + 1, d / 2};
372 else if (iteration == 0)
373 result = {d / 2 + 1, d / 2 - 1};
374 else if (iteration == 1)
375 result = {d / 2, d / 2};
376 else
377 result = {d / 2 + 1, d / 2};
378 Q_ASSERT(result.first + result.second > 0);
379 return result;
380 };
381
382 const auto [dxleft, dxright] = adjustD(dx, m);
383 const auto [dytop, dybottom] = adjustD(dy, m);
384 for (int i = 0; i < sourceWidth; i++) {
385 for (int j = 0; j < sourceHeight; j++) {
386 const int i1 = qMax(a: 0, b: i - dxleft);
387 const int i2 = qMin(a: sourceWidth - 1, b: i + dxright);
388 const int j1 = qMax(a: 0, b: j - dytop);
389 const int j2 = qMin(a: sourceHeight - 1, b: j + dybottom);
390
391 uint64_t colorValue64 = buffer[i2 + j2 * sourceWidth];
392 colorValue64 -= buffer[i1 + j2 * sourceWidth];
393 colorValue64 -= buffer[i2 + j1 * sourceWidth];
394 colorValue64 += buffer[i1 + j1 * sourceWidth];
395 colorValue64 /= uint64_t(dxleft + dxright) * uint64_t(dytop + dybottom);
396
397 const unsigned int colorValue = colorValue64;
398 rawImage[i + j * sourceWidth] &= ~(0xff << col);
399 rawImage[i + j * sourceWidth] |= colorValue << col;
400
401 }
402 }
403 }
404 }
405
406 QRectF trueClipRectGlob = globalSubRegion(p, itemBounds, filterBounds, primitiveUnits, filterUnits);
407
408 QImage result;
409 if (!QImageIOHandler::allocateImage(size: trueClipRectGlob.toRect().size(), format: QImage::Format_ARGB32_Premultiplied, image: &result)) {
410 qCWarning(lcSvgDraw) << "The requested filter buffer is too big, ignoring";
411 return QImage();
412 }
413 result.setOffset(trueClipRectGlob.toRect().topLeft());
414 result.fill(color: Qt::transparent);
415 QPainter transformPainter(&result);
416 transformPainter.setRenderHint(hint: QPainter::Antialiasing, on: true);
417
418 transformPainter.translate(offset: -result.offset());
419 transformPainter.setTransform(transform: restXr, combine: true);
420 transformPainter.drawImage(p: clipRectGlob.topLeft(), image: tempSource);
421 transformPainter.end();
422
423 clipToTransformedBounds(buffer: &result, p, localRect: localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits));
424 return result;
425}
426
427QSvgFeOffset::QSvgFeOffset(QSvgNode *parent, QString input, QString result, const QSvgRectF &rect,
428 qreal dx, qreal dy)
429 : QSvgFeFilterPrimitive(parent, input, result, rect)
430 , m_dx(dx)
431 , m_dy(dy)
432{
433
434}
435
436QSvgNode::Type QSvgFeOffset::type() const
437{
438 return QSvgNode::FeOffset;
439}
440
441QImage QSvgFeOffset::apply(const QMap<QString, QImage> &sources, QPainter *p,
442 const QRectF &itemBounds, const QRectF &filterBounds,
443 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes filterUnits) const
444{
445 if (!sources.contains(key: m_input))
446 return QImage();
447
448 const QImage &source = sources[m_input];
449
450 QRectF clipRect = localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits);
451 QRect clipRectGlob = p->transform().mapRect(clipRect).toRect();
452
453 QPoint offset(m_dx, m_dy);
454 if (primitiveUnits == QtSvg::UnitTypes::objectBoundingBox) {
455 offset = QPoint(m_dx * itemBounds.width(),
456 m_dy * itemBounds.height());
457 }
458 offset = p->transform().map(p: offset) - p->transform().map(p: QPoint(0, 0));
459
460 if (clipRectGlob.isEmpty())
461 return QImage();
462
463 QImage result;
464 if (!QImageIOHandler::allocateImage(size: clipRectGlob.size(), format: QImage::Format_ARGB32_Premultiplied, image: &result)) {
465 qCWarning(lcSvgDraw) << "The requested filter buffer is too big, ignoring";
466 return QImage();
467 }
468 result.setOffset(clipRectGlob.topLeft());
469 result.fill(color: Qt::transparent);
470
471 QPainter copyPainter(&result);
472 copyPainter.drawImage(p: source.offset()
473 - result.offset() + offset, image: source);
474 copyPainter.end();
475
476 clipToTransformedBounds(buffer: &result, p, localRect: clipRect);
477 return result;
478}
479
480
481QSvgFeMerge::QSvgFeMerge(QSvgNode *parent, QString input, QString result, const QSvgRectF &rect)
482 : QSvgFeFilterPrimitive(parent, input, result, rect)
483{
484
485}
486
487QSvgNode::Type QSvgFeMerge::type() const
488{
489 return QSvgNode::FeMerge;
490}
491
492QImage QSvgFeMerge::apply(const QMap<QString, QImage> &sources, QPainter *p,
493 const QRectF &itemBounds, const QRectF &filterBounds,
494 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes filterUnits) const
495{
496 QList<QImage> mergeNodeResults;
497 for (int i = 0; i < renderers().size(); i++) {
498 QSvgNode *child = renderers().at(i);
499 if (child->type() == QSvgNode::FeMergenode) {
500 QSvgFeMergeNode *filter = static_cast<QSvgFeMergeNode*>(child);
501 mergeNodeResults.append(t: filter->apply(sources, p, itemBounds, filterBounds, primitiveUnits, filterUnits));
502 }
503 }
504
505 QRectF clipRect = localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits);
506 QRect clipRectGlob = p->transform().mapRect(clipRect).toRect();
507 if (clipRectGlob.isEmpty())
508 return QImage();
509
510 QImage result;
511 if (!QImageIOHandler::allocateImage(size: clipRectGlob.size(), format: QImage::Format_ARGB32_Premultiplied, image: &result)) {
512 qCWarning(lcSvgDraw) << "The requested filter buffer is too big, ignoring";
513 return QImage();
514 }
515 result.setOffset(clipRectGlob.topLeft());
516 result.fill(color: Qt::transparent);
517
518 QPainter proxyPainter(&result);
519 for (const QImage &i : mergeNodeResults) {
520 proxyPainter.drawImage(r: QRect(i.offset() - result.offset(), i.size()), image: i);
521 }
522 proxyPainter.end();
523
524 clipToTransformedBounds(buffer: &result, p, localRect: clipRect);
525 return result;
526}
527
528bool QSvgFeMerge::requiresSourceAlpha() const
529{
530 for (int i = 0; i < renderers().size(); i++) {
531 QSvgNode *child = renderers().at(i);
532 if (child->type() == QSvgNode::FeMergenode) {
533 QSvgFeMergeNode *filter = static_cast<QSvgFeMergeNode *>(child);
534 if (filter->requiresSourceAlpha())
535 return true;
536 }
537 }
538 return false;
539}
540
541QSvgFeMergeNode::QSvgFeMergeNode(QSvgNode *parent, QString input, QString result, const QSvgRectF &rect)
542 : QSvgFeFilterPrimitive(parent, input, result, rect)
543{
544
545}
546
547QSvgNode::Type QSvgFeMergeNode::type() const
548{
549 return QSvgNode::FeMergenode;
550}
551
552QImage QSvgFeMergeNode::apply(const QMap<QString, QImage> &sources, QPainter *,
553 const QRectF &, const QRectF &, QtSvg::UnitTypes, QtSvg::UnitTypes) const
554{
555 return sources.value(key: m_input);
556}
557
558QSvgFeComposite::QSvgFeComposite(QSvgNode *parent, QString input, QString result, const QSvgRectF &rect,
559 QString input2, Operator op, QVector4D k)
560 : QSvgFeFilterPrimitive(parent, input, result, rect)
561 , m_input2(input2)
562 , m_operator(op)
563 , m_k(k)
564{
565
566}
567
568QSvgNode::Type QSvgFeComposite::type() const
569{
570 return QSvgNode::FeComposite;
571}
572
573QImage QSvgFeComposite::apply(const QMap<QString, QImage> &sources, QPainter *p,
574 const QRectF &itemBounds, const QRectF &filterBounds,
575 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes filterUnits) const
576{
577 if (!sources.contains(key: m_input))
578 return QImage();
579 if (!sources.contains(key: m_input2))
580 return QImage();
581 QImage source1 = sources[m_input];
582 QImage source2 = sources[m_input2];
583 Q_ASSERT(source1.depth() == 32);
584 Q_ASSERT(source2.depth() == 32);
585
586 QRectF clipRect = localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits);
587 QRect clipRectGlob = p->transform().mapRect(clipRect).toRect();
588
589 if (clipRectGlob.isEmpty())
590 return QImage();
591
592 QImage result;
593 if (!QImageIOHandler::allocateImage(size: clipRectGlob.size(), format: QImage::Format_ARGB32_Premultiplied, image: &result)) {
594 qCWarning(lcSvgDraw) << "The requested filter buffer is too big, ignoring";
595 return QImage();
596 }
597 result.setOffset(clipRectGlob.topLeft());
598 result.fill(color: Qt::transparent);
599
600 if (m_operator == Operator::Arithmetic) {
601 const qreal k1 = m_k.x();
602 const qreal k2 = m_k.y();
603 const qreal k3 = m_k.z();
604 const qreal k4 = m_k.w();
605
606 for (int j = 0; j < result.height(); j++) {
607 int jj1 = j - source1.offset().y() + result.offset().y();
608 int jj2 = j - source2.offset().y() + result.offset().y();
609
610 QRgb *resultLine = reinterpret_cast<QRgb *>(result.scanLine(j));
611 QRgb *source1Line = nullptr;
612 QRgb *source2Line = nullptr;
613
614 if (jj1 >= 0 && jj1 < source1.size().height())
615 source1Line = reinterpret_cast<QRgb *>(source1.scanLine(jj1));
616 if (jj2 >= 0 && jj2 < source2.size().height())
617 source2Line = reinterpret_cast<QRgb *>(source2.scanLine(jj2));
618
619 for (int i = 0; i < result.width(); i++) {
620 int ii1 = i - source1.offset().x() + result.offset().x();
621 int ii2 = i - source2.offset().x() + result.offset().x();
622
623 QVector4D s1 = QVector4D(0, 0, 0, 0);
624 QVector4D s2 = QVector4D(0, 0, 0, 0);
625
626 if (ii1 >= 0 && ii1 < source1.size().width() && source1Line) {
627 QRgb pixel1 = source1Line[ii1];
628 s1 = QVector4D(qRed(rgb: pixel1),
629 qGreen(rgb: pixel1),
630 qBlue(rgb: pixel1),
631 qAlpha(rgb: pixel1));
632 }
633
634 if (ii2 >= 0 && ii2 < source2.size().width() && source2Line) {
635 QRgb pixel2 = source2Line[ii2];
636 s2 = QVector4D(qRed(rgb: pixel2),
637 qGreen(rgb: pixel2),
638 qBlue(rgb: pixel2),
639 qAlpha(rgb: pixel2));
640 }
641
642 int r = k1 * s1.x() * s2.x() / 255. + k2 * s1.x() + k3 * s2.x() + k4 * 255.;
643 int g = k1 * s1.y() * s2.y() / 255. + k2 * s1.y() + k3 * s2.y() + k4 * 255.;
644 int b = k1 * s1.z() * s2.z() / 255. + k2 * s1.z() + k3 * s2.z() + k4 * 255.;
645 int a = k1 * s1.w() * s2.w() / 255. + k2 * s1.w() + k3 * s2.w() + k4 * 255.;
646
647 a = qBound(min: 0, val: a, max: 255);
648 resultLine[i] = qRgba(r: qBound(min: 0, val: r, max: a),
649 g: qBound(min: 0, val: g, max: a),
650 b: qBound(min: 0, val: b, max: a),
651 a);
652 }
653 }
654 } else {
655 QPainter proxyPainter(&result);
656 proxyPainter.drawImage(r: QRect(source1.offset() - result.offset(), source1.size()), image: source1);
657
658 switch (m_operator) {
659 case Operator::In:
660 proxyPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
661 break;
662 case Operator::Out:
663 proxyPainter.setCompositionMode(QPainter::CompositionMode_DestinationOut);
664 break;
665 case Operator::Xor:
666 proxyPainter.setCompositionMode(QPainter::CompositionMode_Xor);
667 break;
668 case Operator::Lighter:
669 proxyPainter.setCompositionMode(QPainter::CompositionMode_Lighten);
670 break;
671 case Operator::Atop:
672 proxyPainter.setCompositionMode(QPainter::CompositionMode_DestinationAtop);
673 break;
674 case Operator::Over:
675 proxyPainter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
676 break;
677 case Operator::Arithmetic: // handled above
678 Q_UNREACHABLE();
679 break;
680 }
681 proxyPainter.drawImage(r: QRect(source2.offset()-result.offset(), source2.size()), image: source2);
682 proxyPainter.end();
683 }
684
685 clipToTransformedBounds(buffer: &result, p, localRect: clipRect);
686 return result;
687}
688
689bool QSvgFeComposite::requiresSourceAlpha() const
690{
691 if (QSvgFeFilterPrimitive::requiresSourceAlpha())
692 return true;
693 return m_input2 == QLatin1StringView("SourceAlpha");
694}
695
696
697QSvgFeFlood::QSvgFeFlood(QSvgNode *parent, QString input, QString result,
698 const QSvgRectF &rect, const QColor &color)
699 : QSvgFeFilterPrimitive(parent, input, result, rect)
700 , m_color(color)
701{
702
703}
704
705QSvgNode::Type QSvgFeFlood::type() const
706{
707 return QSvgNode::FeFlood;
708}
709
710QImage QSvgFeFlood::apply(const QMap<QString, QImage> &,
711 QPainter *p, const QRectF &itemBounds, const QRectF &filterBounds,
712 QtSvg::UnitTypes primitiveUnits, QtSvg::UnitTypes filterUnits) const
713{
714
715 QRectF clipRect = localSubRegion(itemBounds, filterBounds, primitiveUnits, filterUnits);
716 QRect clipRectGlob = p->transform().mapRect(clipRect).toRect();
717
718 QImage result;
719 if (!QImageIOHandler::allocateImage(size: clipRectGlob.size(), format: QImage::Format_ARGB32_Premultiplied, image: &result)) {
720 qCWarning(lcSvgDraw) << "The requested filter buffer is too big, ignoring";
721 return QImage();
722 }
723 result.setOffset(clipRectGlob.topLeft());
724 result.fill(color: m_color);
725
726 clipToTransformedBounds(buffer: &result, p, localRect: clipRect);
727 return result;
728}
729
730QSvgFeUnsupported::QSvgFeUnsupported(QSvgNode *parent, QString input, QString result,
731 const QSvgRectF &rect)
732 : QSvgFeFilterPrimitive(parent, input, result, rect)
733{
734}
735
736QSvgNode::Type QSvgFeUnsupported::type() const
737{
738 return QSvgNode::FeUnsupported;
739}
740
741QImage QSvgFeUnsupported::apply(const QMap<QString, QImage> &,
742 QPainter *, const QRectF &, const QRectF &,
743 QtSvg::UnitTypes, QtSvg::UnitTypes) const
744{
745 qCDebug(lcSvgDraw) << "Unsupported filter primitive should not be applied.";
746 return QImage();
747}
748
749QT_END_NAMESPACE
750

source code of qtsvg/src/svg/qsvgfilter.cpp