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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/paint/line_box_list_painter.h"
#include "third_party/blink/renderer/core/layout/api/line_layout_box_model.h"
#include "third_party/blink/renderer/core/layout/geometry/physical_rect.h"
#include "third_party/blink/renderer/core/layout/layout_box_model_object.h"
#include "third_party/blink/renderer/core/layout/line/inline_flow_box.h"
#include "third_party/blink/renderer/core/layout/line/inline_text_box.h"
#include "third_party/blink/renderer/core/layout/line/line_box_list.h"
#include "third_party/blink/renderer/core/layout/line/root_inline_box.h"
#include "third_party/blink/renderer/core/paint/object_painter.h"
#include "third_party/blink/renderer/core/paint/paint_info.h"
#include "third_party/blink/renderer/core/paint/paint_timing_detector.h"
#include "third_party/blink/renderer/platform/graphics/color.h"
#include "third_party/blink/renderer/platform/graphics/paint/drawing_recorder.h"
namespace blink {
namespace {
// Recursively build up backplates behind inline text boxes, each split at the
// paragraph level. Store the results in paragraph_backplates.
void BuildBackplate(const InlineFlowBox* box,
const PhysicalOffset& paint_offset,
PhysicalRect* current_backplate,
int* consecutive_line_breaks,
Vector<PhysicalRect>* paragraph_backplates) {
DCHECK(current_backplate && consecutive_line_breaks && paragraph_backplates);
// The number of consecutive forced breaks that split the backplate by
// paragraph.
static constexpr int kMaxConsecutiveLineBreaks = 2;
// Build up and paint backplates of all child inline text boxes. We are not
// able to simply use the linebox rect to compute the backplate because the
// backplate should only be painted for inline text and not for atomic
// inlines.
for (InlineBox* child = box->FirstChild(); child;
child = child->NextOnLine()) {
LineLayoutItem layout_item = child->GetLineLayoutItem();
if (layout_item.IsText() || layout_item.IsListMarker()) {
if (layout_item.IsText()) {
String child_text =
ToInlineTextBox(child)->GetLineLayoutItem().GetText();
if (ToInlineTextBox(child)->IsLineBreak() ||
child_text.StartsWith('\n'))
(*consecutive_line_breaks)++;
}
if (*consecutive_line_breaks >= kMaxConsecutiveLineBreaks) {
// This is a paragraph point.
paragraph_backplates->push_back(*current_backplate);
*current_backplate = PhysicalRect();
*consecutive_line_breaks = 0;
}
PhysicalOffset box_origin(PhysicalOffset(child->Location()) +
paint_offset);
PhysicalRect box_rect(box_origin, PhysicalSize(child->LogicalWidth(),
child->LogicalHeight()));
if (*consecutive_line_breaks > 0 && !box_rect.IsEmpty()) {
// Text was reached, so reset consecutive_line_breaks.
*consecutive_line_breaks = 0;
}
current_backplate->Unite(box_rect);
} else if (child->IsInlineFlowBox()) {
// If an inline flow box was reached, continue to recursively build up the
// backplate.
BuildBackplate(ToInlineFlowBox(child), paint_offset, current_backplate,
consecutive_line_breaks, paragraph_backplates);
}
}
}
void AddURLRectsForInlineChildrenRecursively(
const LayoutObject& layout_object,
const PaintInfo& paint_info,
const PhysicalOffset& paint_offset) {
for (LayoutObject* child = layout_object.SlowFirstChild(); child;
child = child->NextSibling()) {
if (!child->IsLayoutInline() ||
ToLayoutBoxModelObject(child)->HasSelfPaintingLayer())
continue;
ObjectPainter(*child).AddURLRectIfNeeded(paint_info, paint_offset);
AddURLRectsForInlineChildrenRecursively(*child, paint_info, paint_offset);
}
}
} // anonymous namespace
bool LineBoxListPainter::ShouldPaint(const LayoutBoxModelObject& layout_object,
const PaintInfo& paint_info,
const PhysicalOffset& paint_offset) const {
DCHECK(!ShouldPaintSelfOutline(paint_info.phase) &&
!ShouldPaintDescendantOutlines(paint_info.phase));
// The only way an inline could paint like this is if it has a layer.
DCHECK(layout_object.IsLayoutBlock() ||
(layout_object.IsLayoutInline() && layout_object.HasLayer()));
// If we have no lines then we have no work to do.
if (!line_box_list_.First())
return false;
if (!line_box_list_.AnyLineIntersectsRect(
LineLayoutBoxModel(const_cast<LayoutBoxModelObject*>(&layout_object)),
paint_info.GetCullRect(), paint_offset))
return false;
return true;
}
void LineBoxListPainter::Paint(const LayoutBoxModelObject& layout_object,
const PaintInfo& paint_info,
const PhysicalOffset& paint_offset) const {
// Only paint during the foreground/selection phases.
if (paint_info.phase != PaintPhase::kForeground &&
paint_info.phase != PaintPhase::kSelectionDragImage &&
paint_info.phase != PaintPhase::kTextClip &&
paint_info.phase != PaintPhase::kMask)
return;
if (paint_info.phase == PaintPhase::kForeground &&
paint_info.ShouldAddUrlMetadata()) {
AddURLRectsForInlineChildrenRecursively(layout_object, paint_info,
paint_offset);
}
if (!ShouldPaint(layout_object, paint_info, paint_offset))
return;
ScopedPaintTimingDetectorBlockPaintHook
scoped_paint_timing_detector_block_paint_hook;
if (paint_info.phase == PaintPhase::kForeground) {
scoped_paint_timing_detector_block_paint_hook.EmplaceIfNeeded(
layout_object,
paint_info.context.GetPaintController().CurrentPaintChunkProperties());
}
// See if our root lines intersect with the dirty rect. If so, then we paint
// them. Note that boxes can easily overlap, so we can't make any assumptions
// based off positions of our first line box or our last line box.
for (InlineFlowBox* curr : line_box_list_) {
if (line_box_list_.LineIntersectsDirtyRect(
LineLayoutBoxModel(
const_cast<LayoutBoxModelObject*>(&layout_object)),
curr, paint_info.GetCullRect(), paint_offset)) {
RootInlineBox& root = curr->Root();
curr->Paint(paint_info, paint_offset.ToLayoutPoint(), root.LineTop(),
root.LineBottom());
}
}
}
void LineBoxListPainter::PaintBackplate(
const LayoutBoxModelObject& layout_object,
const PaintInfo& paint_info,
const PhysicalOffset& paint_offset) const {
DCHECK_EQ(paint_info.phase, PaintPhase::kForcedColorsModeBackplate);
if (!ShouldPaint(layout_object, paint_info, paint_offset))
return;
// Only paint backplates behind text when forced-color-adjust is auto.
const ComputedStyle& style =
line_box_list_.First()->GetLineLayoutItem().StyleRef();
if (style.ForcedColorAdjust() == EForcedColorAdjust::kNone)
return;
if (DrawingRecorder::UseCachedDrawingIfPossible(
paint_info.context, layout_object,
DisplayItem::kForcedColorsModeBackplate))
return;
DrawingRecorder recorder(paint_info.context, layout_object,
DisplayItem::kForcedColorsModeBackplate);
Color backplate_color = style.ForcedBackplateColor();
const auto& backplates = GetBackplates(paint_offset);
for (const auto backplate : backplates)
paint_info.context.FillRect(FloatRect(backplate), backplate_color);
}
Vector<PhysicalRect> LineBoxListPainter::GetBackplates(
const PhysicalOffset& paint_offset) const {
Vector<PhysicalRect> paragraph_backplates;
PhysicalRect current_backplate;
int consecutive_line_breaks = 0;
for (const InlineFlowBox* line : line_box_list_) {
// Recursively build up and paint backplates for line boxes containing text.
BuildBackplate(line, paint_offset, ¤t_backplate,
&consecutive_line_breaks, ¶graph_backplates);
}
if (!current_backplate.IsEmpty())
paragraph_backplates.push_back(current_backplate);
return paragraph_backplates;
}
} // namespace blink
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