| /* |
| * Copyright (C) 2011-2017 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "FilterOperations.h" |
| |
| #include "FEGaussianBlur.h" |
| #include "ImageBuffer.h" |
| #include "IntSize.h" |
| #include "LengthFunctions.h" |
| #include <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| bool FilterOperations::operator==(const FilterOperations& other) const |
| { |
| size_t size = m_operations.size(); |
| if (size != other.m_operations.size()) |
| return false; |
| for (size_t i = 0; i < size; i++) { |
| if (*m_operations[i] != *other.m_operations[i]) |
| return false; |
| } |
| return true; |
| } |
| |
| bool FilterOperations::operationsMatch(const FilterOperations& other) const |
| { |
| size_t size = operations().size(); |
| if (size != other.operations().size()) |
| return false; |
| for (size_t i = 0; i < size; ++i) { |
| if (!operations()[i]->isSameType(*other.operations()[i])) |
| return false; |
| } |
| return true; |
| } |
| |
| bool FilterOperations::hasReferenceFilter() const |
| { |
| for (auto& operation : m_operations) { |
| if (operation->type() == FilterOperation::REFERENCE) |
| return true; |
| } |
| return false; |
| } |
| |
| IntOutsets FilterOperations::outsets() const |
| { |
| IntOutsets totalOutsets; |
| for (auto& operation : m_operations) { |
| switch (operation->type()) { |
| case FilterOperation::BLUR: { |
| auto& blurOperation = downcast<BlurFilterOperation>(*operation); |
| float stdDeviation = floatValueForLength(blurOperation.stdDeviation(), 0); |
| IntSize outsetSize = FEGaussianBlur::calculateOutsetSize({ stdDeviation, stdDeviation }); |
| IntOutsets outsets(outsetSize.height(), outsetSize.width(), outsetSize.height(), outsetSize.width()); |
| totalOutsets += outsets; |
| break; |
| } |
| case FilterOperation::DROP_SHADOW: { |
| auto& dropShadowOperation = downcast<DropShadowFilterOperation>(*operation); |
| float stdDeviation = dropShadowOperation.stdDeviation(); |
| IntSize outsetSize = FEGaussianBlur::calculateOutsetSize({ stdDeviation, stdDeviation }); |
| IntOutsets outsets { |
| std::max(0, outsetSize.height() - dropShadowOperation.y()), |
| std::max(0, outsetSize.width() + dropShadowOperation.x()), |
| std::max(0, outsetSize.height() + dropShadowOperation.y()), |
| std::max(0, outsetSize.width() - dropShadowOperation.x()) |
| }; |
| totalOutsets += outsets; |
| break; |
| } |
| case FilterOperation::REFERENCE: |
| ASSERT_NOT_REACHED(); |
| break; |
| default: |
| break; |
| } |
| } |
| return totalOutsets; |
| } |
| |
| bool FilterOperations::transformColor(Color& color) const |
| { |
| if (isEmpty() || !color.isValid()) |
| return false; |
| // Color filter does not apply to semantic CSS colors (like "Windowframe"). |
| if (color.isSemantic()) |
| return false; |
| |
| auto sRGBAColor = color.toColorTypeLossy<SRGBA<float>>(); |
| |
| for (auto& operation : m_operations) { |
| if (!operation->transformColor(sRGBAColor)) |
| return false; |
| } |
| |
| color = convertColor<SRGBA<uint8_t>>(sRGBAColor); |
| return true; |
| } |
| |
| bool FilterOperations::inverseTransformColor(Color& color) const |
| { |
| if (isEmpty() || !color.isValid()) |
| return false; |
| // Color filter does not apply to semantic CSS colors (like "Windowframe"). |
| if (color.isSemantic()) |
| return false; |
| |
| auto sRGBAColor = color.toColorTypeLossy<SRGBA<float>>(); |
| |
| for (auto& operation : m_operations) { |
| if (!operation->inverseTransformColor(sRGBAColor)) |
| return false; |
| } |
| |
| color = convertColor<SRGBA<uint8_t>>(sRGBAColor); |
| return true; |
| } |
| |
| bool FilterOperations::hasFilterThatAffectsOpacity() const |
| { |
| for (auto& operation : m_operations) { |
| if (operation->affectsOpacity()) |
| return true; |
| } |
| return false; |
| } |
| |
| bool FilterOperations::hasFilterThatMovesPixels() const |
| { |
| for (auto& operation : m_operations) { |
| if (operation->movesPixels()) |
| return true; |
| } |
| return false; |
| } |
| |
| bool FilterOperations::hasFilterThatShouldBeRestrictedBySecurityOrigin() const |
| { |
| for (auto& operation : m_operations) { |
| if (operation->shouldBeRestrictedBySecurityOrigin()) |
| return true; |
| } |
| return false; |
| } |
| |
| TextStream& operator<<(TextStream& ts, const FilterOperations& filters) |
| { |
| for (size_t i = 0; i < filters.size(); ++i) { |
| auto filter = filters.at(i); |
| if (filter) |
| ts << *filter; |
| else |
| ts << "(null)"; |
| if (i < filters.size() - 1) |
| ts << " "; |
| } |
| return ts; |
| } |
| |
| } // namespace WebCore |