| /* |
| * Copyright (C) 2011 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 COMPUTER, 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 COMPUTER, 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 "IntSize.h" |
| #include "LengthFunctions.h" |
| |
| #if ENABLE(CSS_FILTERS) |
| |
| namespace WebCore { |
| |
| static inline IntSize outsetSizeForBlur(float stdDeviation) |
| { |
| unsigned kernelSizeX = 0; |
| unsigned kernelSizeY = 0; |
| FEGaussianBlur::calculateUnscaledKernelSize(kernelSizeX, kernelSizeY, stdDeviation, stdDeviation); |
| |
| IntSize outset; |
| // We take the half kernel size and multiply it with three, because we run box blur three times. |
| outset.setWidth(3 * kernelSizeX * 0.5f); |
| outset.setHeight(3 * kernelSizeY * 0.5f); |
| |
| return outset; |
| } |
| |
| FilterOperations::FilterOperations() |
| { |
| } |
| |
| FilterOperations& FilterOperations::operator=(const FilterOperations& other) |
| { |
| m_operations = other.m_operations; |
| return *this; |
| } |
| |
| bool FilterOperations::operator==(const FilterOperations& o) const |
| { |
| if (m_operations.size() != o.m_operations.size()) |
| return false; |
| |
| unsigned s = m_operations.size(); |
| for (unsigned i = 0; i < s; i++) { |
| if (*m_operations[i] != *o.m_operations[i]) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool FilterOperations::operationsMatch(const FilterOperations& other) const |
| { |
| size_t numOperations = operations().size(); |
| // If the sizes of the function lists don't match, the lists don't match |
| if (numOperations != other.operations().size()) |
| return false; |
| |
| // If the types of each function are not the same, the lists don't match |
| for (size_t i = 0; i < numOperations; ++i) { |
| if (!operations()[i]->isSameType(*other.operations()[i])) |
| return false; |
| } |
| return true; |
| } |
| |
| #if ENABLE(CSS_SHADERS) |
| bool FilterOperations::hasCustomFilter() const |
| { |
| for (size_t i = 0; i < m_operations.size(); ++i) { |
| FilterOperation::OperationType type = m_operations.at(i)->type(); |
| if (type == FilterOperation::CUSTOM || type == FilterOperation::VALIDATED_CUSTOM) |
| return true; |
| } |
| return false; |
| } |
| #endif |
| |
| bool FilterOperations::hasReferenceFilter() const |
| { |
| for (size_t i = 0; i < m_operations.size(); ++i) { |
| if (m_operations.at(i)->type() == FilterOperation::REFERENCE) |
| return true; |
| } |
| return false; |
| } |
| |
| bool FilterOperations::hasOutsets() const |
| { |
| for (size_t i = 0; i < m_operations.size(); ++i) { |
| FilterOperation::OperationType operationType = m_operations.at(i).get()->type(); |
| if (operationType == FilterOperation::BLUR || operationType == FilterOperation::DROP_SHADOW) |
| return true; |
| } |
| return false; |
| } |
| |
| FilterOutsets FilterOperations::outsets() const |
| { |
| FilterOutsets totalOutsets; |
| for (size_t i = 0; i < m_operations.size(); ++i) { |
| FilterOperation* filterOperation = m_operations.at(i).get(); |
| switch (filterOperation->type()) { |
| case FilterOperation::BLUR: { |
| BlurFilterOperation* blurOperation = static_cast<BlurFilterOperation*>(filterOperation); |
| float stdDeviation = floatValueForLength(blurOperation->stdDeviation(), 0); |
| IntSize outsetSize = outsetSizeForBlur(stdDeviation); |
| FilterOutsets outsets(outsetSize.height(), outsetSize.width(), outsetSize.height(), outsetSize.width()); |
| totalOutsets += outsets; |
| break; |
| } |
| case FilterOperation::DROP_SHADOW: { |
| DropShadowFilterOperation* dropShadowOperation = static_cast<DropShadowFilterOperation*>(filterOperation); |
| IntSize outsetSize = outsetSizeForBlur(dropShadowOperation->stdDeviation()); |
| FilterOutsets 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; |
| } |
| #if ENABLE(CSS_SHADERS) |
| case FilterOperation::CUSTOM: |
| case FilterOperation::VALIDATED_CUSTOM: { |
| // FIXME: Need to include the filter margins here. |
| // https://bugs.webkit.org/show_bug.cgi?id=71400 |
| break; |
| } |
| #endif |
| default: |
| break; |
| } |
| } |
| return totalOutsets; |
| } |
| |
| bool FilterOperations::hasFilterThatAffectsOpacity() const |
| { |
| for (size_t i = 0; i < m_operations.size(); ++i) |
| if (m_operations[i]->affectsOpacity()) |
| return true; |
| return false; |
| } |
| |
| bool FilterOperations::hasFilterThatMovesPixels() const |
| { |
| for (size_t i = 0; i < m_operations.size(); ++i) |
| if (m_operations[i]->movesPixels()) |
| return true; |
| return false; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(CSS_FILTERS) |