Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/filters/FilterOperations.cpp

-/*
- * 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 "core/platform/graphics/filters/FilterOperations.h"
-
-#include "core/platform/graphics/filters/FEGaussianBlur.h"
-#include "platform/LengthFunctions.h"
-#include "platform/geometry/IntSize.h"
-
-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::canInterpolateWith(const FilterOperations& other) const
-{
-    for (size_t i = 0; i < operations().size(); ++i) {
-        if (!FilterOperation::canInterpolate(operations()[i]->type()))
-            return false;
-    }
-
-    for (size_t i = 0; i < other.operations().size(); ++i) {
-        if (!FilterOperation::canInterpolate(other.operations()[i]->type()))
-            return false;
-    }
-
-    size_t commonSize = std::min(operations().size(), other.operations().size());
-    for (size_t i = 0; i < commonSize; ++i) {
-        if (!operations()[i]->isSameType(*other.operations()[i]))
-            return false;
-    }
-    return true;
-}
-
-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;
-}
-
-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)->type();
-        if (operationType == FilterOperation::BLUR || operationType == FilterOperation::DROP_SHADOW || operationType == FilterOperation::REFERENCE)
-            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 = toBlurFilterOperation(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 = toDropShadowFilterOperation(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;
-        }
-        case FilterOperation::REFERENCE: {
-            ReferenceFilterOperation* referenceOperation = toReferenceFilterOperation(filterOperation);
-            if (referenceOperation->filter() && referenceOperation->filter()->lastEffect()) {
-                FloatRect outsetRect(0, 0, 1, 1);
-                outsetRect = referenceOperation->filter()->lastEffect()->mapRectRecursive(outsetRect);
-                FilterOutsets outsets(
-                    std::max(0.0f, -outsetRect.y()),
-                    std::max(0.0f, outsetRect.x() + outsetRect.width() - 1),
-                    std::max(0.0f, outsetRect.y() + outsetRect.height() - 1),
-                    std::max(0.0f, -outsetRect.x())
-                );
-                totalOutsets += outsets;
-            }
-            break;
-        }
-        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;
-        }
-        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
-