1 /*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "platform/graphics/filters/FilterOperations.h"
28
29 #include "platform/LengthFunctions.h"
30 #include "platform/geometry/IntSize.h"
31 #include "platform/graphics/filters/FEGaussianBlur.h"
32
33 namespace WebCore {
34
outsetSizeForBlur(float stdDeviation)35 static inline IntSize outsetSizeForBlur(float stdDeviation)
36 {
37 unsigned kernelSizeX = 0;
38 unsigned kernelSizeY = 0;
39 FEGaussianBlur::calculateUnscaledKernelSize(kernelSizeX, kernelSizeY, stdDeviation, stdDeviation);
40
41 IntSize outset;
42 // We take the half kernel size and multiply it with three, because we run box blur three times.
43 outset.setWidth(3 * kernelSizeX * 0.5f);
44 outset.setHeight(3 * kernelSizeY * 0.5f);
45
46 return outset;
47 }
48
FilterOperations()49 FilterOperations::FilterOperations()
50 {
51 }
52
operator =(const FilterOperations & other)53 FilterOperations& FilterOperations::operator=(const FilterOperations& other)
54 {
55 m_operations = other.m_operations;
56 return *this;
57 }
58
operator ==(const FilterOperations & o) const59 bool FilterOperations::operator==(const FilterOperations& o) const
60 {
61 if (m_operations.size() != o.m_operations.size())
62 return false;
63
64 unsigned s = m_operations.size();
65 for (unsigned i = 0; i < s; i++) {
66 if (*m_operations[i] != *o.m_operations[i])
67 return false;
68 }
69
70 return true;
71 }
72
canInterpolateWith(const FilterOperations & other) const73 bool FilterOperations::canInterpolateWith(const FilterOperations& other) const
74 {
75 for (size_t i = 0; i < operations().size(); ++i) {
76 if (!FilterOperation::canInterpolate(operations()[i]->type()))
77 return false;
78 }
79
80 for (size_t i = 0; i < other.operations().size(); ++i) {
81 if (!FilterOperation::canInterpolate(other.operations()[i]->type()))
82 return false;
83 }
84
85 size_t commonSize = std::min(operations().size(), other.operations().size());
86 for (size_t i = 0; i < commonSize; ++i) {
87 if (!operations()[i]->isSameType(*other.operations()[i]))
88 return false;
89 }
90 return true;
91 }
92
hasCustomFilter() const93 bool FilterOperations::hasCustomFilter() const
94 {
95 for (size_t i = 0; i < m_operations.size(); ++i) {
96 FilterOperation::OperationType type = m_operations.at(i)->type();
97 if (type == FilterOperation::CUSTOM || type == FilterOperation::VALIDATED_CUSTOM)
98 return true;
99 }
100 return false;
101 }
102
hasReferenceFilter() const103 bool FilterOperations::hasReferenceFilter() const
104 {
105 for (size_t i = 0; i < m_operations.size(); ++i) {
106 if (m_operations.at(i)->type() == FilterOperation::REFERENCE)
107 return true;
108 }
109 return false;
110 }
111
hasOutsets() const112 bool FilterOperations::hasOutsets() const
113 {
114 for (size_t i = 0; i < m_operations.size(); ++i) {
115 FilterOperation::OperationType operationType = m_operations.at(i)->type();
116 if (operationType == FilterOperation::BLUR || operationType == FilterOperation::DROP_SHADOW || operationType == FilterOperation::REFERENCE)
117 return true;
118 }
119 return false;
120 }
121
outsets() const122 FilterOutsets FilterOperations::outsets() const
123 {
124 FilterOutsets totalOutsets;
125 for (size_t i = 0; i < m_operations.size(); ++i) {
126 FilterOperation* filterOperation = m_operations.at(i).get();
127 switch (filterOperation->type()) {
128 case FilterOperation::BLUR: {
129 BlurFilterOperation* blurOperation = toBlurFilterOperation(filterOperation);
130 float stdDeviation = floatValueForLength(blurOperation->stdDeviation(), 0);
131 IntSize outsetSize = outsetSizeForBlur(stdDeviation);
132 FilterOutsets outsets(outsetSize.height(), outsetSize.width(), outsetSize.height(), outsetSize.width());
133 totalOutsets += outsets;
134 break;
135 }
136 case FilterOperation::DROP_SHADOW: {
137 DropShadowFilterOperation* dropShadowOperation = toDropShadowFilterOperation(filterOperation);
138 IntSize outsetSize = outsetSizeForBlur(dropShadowOperation->stdDeviation());
139 FilterOutsets outsets(
140 std::max(0, outsetSize.height() - dropShadowOperation->y()),
141 std::max(0, outsetSize.width() + dropShadowOperation->x()),
142 std::max(0, outsetSize.height() + dropShadowOperation->y()),
143 std::max(0, outsetSize.width() - dropShadowOperation->x())
144 );
145 totalOutsets += outsets;
146 break;
147 }
148 case FilterOperation::REFERENCE: {
149 ReferenceFilterOperation* referenceOperation = toReferenceFilterOperation(filterOperation);
150 if (referenceOperation->filter() && referenceOperation->filter()->lastEffect()) {
151 FloatRect outsetRect(0, 0, 1, 1);
152 outsetRect = referenceOperation->filter()->lastEffect()->mapRectRecursive(outsetRect);
153 FilterOutsets outsets(
154 std::max(0.0f, -outsetRect.y()),
155 std::max(0.0f, outsetRect.x() + outsetRect.width() - 1),
156 std::max(0.0f, outsetRect.y() + outsetRect.height() - 1),
157 std::max(0.0f, -outsetRect.x())
158 );
159 totalOutsets += outsets;
160 }
161 break;
162 }
163 case FilterOperation::CUSTOM:
164 case FilterOperation::VALIDATED_CUSTOM: {
165 // FIXME: Need to include the filter margins here.
166 // https://bugs.webkit.org/show_bug.cgi?id=71400
167 break;
168 }
169 default:
170 break;
171 }
172 }
173 return totalOutsets;
174 }
175
hasFilterThatAffectsOpacity() const176 bool FilterOperations::hasFilterThatAffectsOpacity() const
177 {
178 for (size_t i = 0; i < m_operations.size(); ++i)
179 if (m_operations[i]->affectsOpacity())
180 return true;
181 return false;
182 }
183
hasFilterThatMovesPixels() const184 bool FilterOperations::hasFilterThatMovesPixels() const
185 {
186 for (size_t i = 0; i < m_operations.size(); ++i)
187 if (m_operations[i]->movesPixels())
188 return true;
189 return false;
190 }
191
192 } // namespace WebCore
193
194