Bug Summary

File:Volumes/Data/worker/macOS-Safer-CPP-Checks-EWS/build/Source/WebCore/rendering/RenderScrollbarPart.cpp
Warning:line 155, column 55
Call argument for 'this' parameter is unchecked and unsafe

Annotated Source Code

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security.insecureAPI.UncheckedReturn -analyzer-checker security.insecureAPI.getpw -analyzer-checker security.insecureAPI.gets -analyzer-checker security.insecureAPI.mkstemp -analyzer-checker security.insecureAPI.mktemp -analyzer-disable-checker security.insecureAPI.rand -analyzer-disable-checker security.insecureAPI.strcpy -analyzer-checker security.insecureAPI.vfork -analyzer-disable-checker alpha,apiModeling,core,cplusplus,deadcode,debug,fuchsia,nullability,optin,osx,security,unix,webkit -analyzer-checker 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1/*
2 * Copyright (C) 2008-2025 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 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 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 "RenderScrollbarPart.h"
28
29#include "PaintInfo.h"
30#include "RenderBoxInlines.h"
31#include "RenderBoxModelObjectInlines.h"
32#include "RenderScrollbar.h"
33#include "RenderScrollbarTheme.h"
34#include "RenderStyle+GettersInlines.h"
35#include "RenderView.h"
36#include <wtf/StackStats.h>
37#include <wtf/TZoneMallocInlines.h>
38
39namespace WebCore {
40
41WTF_MAKE_TZONE_ALLOCATED_IMPL(RenderScrollbarPart)::bmalloc::api::HeapRef RenderScrollbarPart::s_heapRef; const
TZoneSpecification RenderScrollbarPart::s_heapSpec = { &
RenderScrollbarPart::s_heapRef, TZoneSpecification::encodeSize
<RenderScrollbarPart>(), TZoneSpecification::encodeAlignment
<RenderScrollbarPart>(), TZoneSpecification::encodeCategory
<RenderScrollbarPart>(), ::bmalloc::api::compactAllocationMode
<RenderScrollbarPart>(), TZoneSpecification::encodeDescriptor
<RenderScrollbarPart>(), }; void* RenderScrollbarPart::
operatorNewSlow(size_t size) { if constexpr (::bmalloc::api::
compactAllocationMode<RenderScrollbarPart>() == CompactAllocationMode
::Compact) return ::bmalloc::api::tzoneAllocateCompactSlow(size
, s_heapSpec); return ::bmalloc::api::tzoneAllocateNonCompactSlow
(size, s_heapSpec); } using __makeBtzoneMallocedInlineMacroSemicolonifier
__attribute__((unused)) = int
;
42
43RenderScrollbarPart::RenderScrollbarPart(Document& document, RenderStyle&& style, RenderScrollbar* scrollbar, ScrollbarPart part)
44 : RenderBlock(Type::ScrollbarPart, document, WTF::move(style), { })
45 , m_scrollbar(scrollbar)
46 , m_part(part)
47{
48 ASSERT(isRenderScrollbarPart())((void)0);
49}
50
51RenderScrollbarPart::~RenderScrollbarPart() = default;
52
53void RenderScrollbarPart::layout()
54{
55 StackStats::LayoutCheckPoint layoutCheckPoint;
56 setLocation(LayoutPoint()); // We don't worry about positioning ourselves. We're just determining our minimum width/height.
57 if (m_scrollbar->orientation() == ScrollbarOrientation::Horizontal)
58 layoutHorizontalPart();
59 else
60 layoutVerticalPart();
61
62 clearNeedsLayout();
63}
64
65void RenderScrollbarPart::layoutHorizontalPart()
66{
67 if (m_part == ScrollbarBGPart) {
68 setWidth(m_scrollbar->width());
69 computeScrollbarHeight();
70 } else {
71 computeScrollbarWidth();
72 setHeight(m_scrollbar->height());
73 }
74}
75
76void RenderScrollbarPart::layoutVerticalPart()
77{
78 if (m_part == ScrollbarBGPart) {
79 computeScrollbarWidth();
80 setHeight(m_scrollbar->height());
81 } else {
82 setWidth(m_scrollbar->width());
83 computeScrollbarHeight();
84 }
85}
86
87static int calcScrollbarThicknessUsing(const Style::PreferredSize& preferredSize, Style::ZoomFactor zoomFactor)
88{
89 if (!preferredSize.isPercentOrCalculated() && !preferredSize.isIntrinsicOrLegacyIntrinsicOrAuto())
90 return Style::evaluateMinimum<LayoutUnit>(preferredSize, 0_lu, zoomFactor);
91 return ScrollbarTheme::theme().scrollbarThickness();
92}
93
94static int calcScrollbarThicknessUsing(const Style::MinimumSize& minimumSize, Style::ZoomFactor zoomFactor)
95{
96 if ((!minimumSize.isPercentOrCalculated() && !minimumSize.isIntrinsicOrLegacyIntrinsicOrAuto()) || minimumSize.isAuto())
97 return Style::evaluateMinimum<LayoutUnit>(minimumSize, 0_lu, zoomFactor);
98 return ScrollbarTheme::theme().scrollbarThickness();
99}
100
101static int calcScrollbarThicknessUsing(const Style::MaximumSize& maximumSize, Style::ZoomFactor zoomFactor)
102{
103 if (!maximumSize.isPercentOrCalculated() && !maximumSize.isIntrinsic() && !maximumSize.isLegacyIntrinsic())
104 return Style::evaluateMinimum<LayoutUnit>(maximumSize, 0_lu, zoomFactor);
105 return ScrollbarTheme::theme().scrollbarThickness();
106}
107
108void RenderScrollbarPart::computeScrollbarWidth()
109{
110 if (!m_scrollbar->owningRenderer())
111 return;
112 auto zoomFactor = style().usedZoomForLength();
113 auto width = calcScrollbarThicknessUsing(style().width(), zoomFactor);
114 auto minWidth = calcScrollbarThicknessUsing(style().minWidth(), zoomFactor);
115 auto maxWidth = style().maxWidth().isNone() ? width : calcScrollbarThicknessUsing(style().maxWidth(), zoomFactor);
116 setWidth(std::max(minWidth, std::min(maxWidth, width)));
117
118 // Buttons and track pieces can all have margins along the axis of the scrollbar.
119 m_marginBox.setLeft(Style::evaluateMinimum<LayoutUnit>(style().marginLeft(), 0_lu, style().usedZoomForLength()));
120 m_marginBox.setRight(Style::evaluateMinimum<LayoutUnit>(style().marginRight(), 0_lu, style().usedZoomForLength()));
121}
122
123void RenderScrollbarPart::computeScrollbarHeight()
124{
125 if (!m_scrollbar->owningRenderer())
126 return;
127 auto zoomFactor = style().usedZoomForLength();
128 auto height = calcScrollbarThicknessUsing(style().height(), zoomFactor);
129 auto minHeight = calcScrollbarThicknessUsing(style().minHeight(), zoomFactor);
130 auto maxHeight = style().maxHeight().isNone() ? height : calcScrollbarThicknessUsing(style().maxHeight(), zoomFactor);
131 setHeight(std::max(minHeight, std::min(maxHeight, height)));
132
133 // Buttons and track pieces can all have margins along the axis of the scrollbar.
134 m_marginBox.setTop(Style::evaluateMinimum<LayoutUnit>(style().marginTop(), 0_lu, style().usedZoomForLength()));
135 m_marginBox.setBottom(Style::evaluateMinimum<LayoutUnit>(style().marginBottom(), 0_lu, style().usedZoomForLength()));
136}
137
138void RenderScrollbarPart::styleDidChange(Style::Difference diff, const RenderStyle* oldStyle)
139{
140 RenderBlock::styleDidChange(diff, oldStyle);
141 setInline(false);
142 clearPositionedState();
143 setFloating(false);
144 setHasNonVisibleOverflow(false);
145 if (oldStyle && m_scrollbar && m_part != NoPart && diff >= Style::DifferenceResult::Repaint)
146 m_scrollbar->theme().invalidatePart(*m_scrollbar, m_part);
147}
148
149void RenderScrollbarPart::imageChanged(WrappedImagePtr image, const IntRect* rect)
150{
151 if (m_scrollbar && m_part != NoPart)
152 m_scrollbar->theme().invalidatePart(*m_scrollbar, m_part);
153 else {
154 if (view().frameView().isFrameViewScrollCorner(*this)) {
155 view().frameView().invalidateScrollCorner(view().frameView().scrollCornerRect());
Call argument for 'this' parameter is unchecked and unsafe
156 return;
157 }
158
159 RenderBlock::imageChanged(image, rect);
160 }
161}
162
163void RenderScrollbarPart::paintIntoRect(GraphicsContext& graphicsContext, const LayoutPoint& paintOffset, const LayoutRect& rect)
164{
165 // Make sure our dimensions match the rect.
166 setLocation(rect.location() - toLayoutSize(paintOffset));
167 setWidth(rect.width());
168 setHeight(rect.height());
169
170 if (graphicsContext.paintingDisabled() || style().opacity().isTransparent())
171 return;
172
173 // We don't use RenderLayers for scrollbar parts, so we need to handle opacity here.
174 // Opacity for ScrollbarBGPart is handled by RenderScrollbarTheme::willPaintScrollbar().
175 bool needsTransparencyLayer = m_part != ScrollbarBGPart && !style().opacity().isOpaque();
176 if (needsTransparencyLayer) {
177 graphicsContext.save();
178 graphicsContext.clip(rect);
179 graphicsContext.beginTransparencyLayer(style().opacity().value.value);
180 }
181
182 // Now do the paint.
183 PaintInfo paintInfo(graphicsContext, snappedIntRect(rect), PaintPhase::BlockBackground, PaintBehavior::Normal);
184 paint(paintInfo, paintOffset);
185 paintInfo.phase = PaintPhase::ChildBlockBackgrounds;
186 paint(paintInfo, paintOffset);
187 paintInfo.phase = PaintPhase::Float;
188 paint(paintInfo, paintOffset);
189 paintInfo.phase = PaintPhase::Foreground;
190 paint(paintInfo, paintOffset);
191 paintInfo.phase = PaintPhase::Outline;
192 paint(paintInfo, paintOffset);
193
194 if (needsTransparencyLayer) {
195 graphicsContext.endTransparencyLayer();
196 graphicsContext.restore();
197 }
198}
199
200RenderBox* RenderScrollbarPart::rendererOwningScrollbar() const
201{
202 if (!m_scrollbar)
203 return nullptr;
204 return m_scrollbar->owningRenderer();
205}
206
207}