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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
* reserved.
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_PAINT_PHASE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_PAINT_PHASE_H_
namespace blink {
// The painting of a layer occurs in 5 phases, Each involves a recursive
// descent into the layer's layout objects in painting order:
// 1. Background phase: backgrounds and borders of all blocks are painted.
// Inlines are not painted at all. Touch-action and wheel hit test rects are
// also painted during this phase (see: paint/README.md#hit-test-painting).
// 2. ForcedColorsModeBackplate phase: a readability backplate is painted
// behind all inline text, split by paragraph. This phase should only paint
// content when in forced colors mode to ensure readability for text above
// images.
// 3. Float phase: floating objects are painted above block backgrounds but
// entirely below inline content that can overlap them.
// 4. Foreground phase: all inlines are fully painted. Atomic inline elements
// will get all 4 non-backplate phases invoked on them during this phase,
// as if they were stacking contexts (see
// ObjectPainter::PaintAllPhasesAtomically()).
// 5. Outline phase: outlines are painted over the foreground.
enum class PaintPhase {
// Background phase
//
// Paint background of the current object and non-self-painting descendants.
kBlockBackground,
//
// The following two values are added besides the normal
// kBlockBackground to distinguish backgrounds for the object itself
// and for descendants, because the two backgrounds are often painted with
// different scroll offsets and clips.
//
// Paint background of the current object only.
kSelfBlockBackgroundOnly,
// Paint backgrounds of non-self-painting descendants only. The painter should
// call each non-self-painting child's paint method by passing
// PaintInfo::ForDescendants() which converts kDescendantBlockBackgroundsOnly
// to kBlockBackground.
kDescendantBlockBackgroundsOnly,
// ForcedColorsModeBackplate phase - used to ensure readability in forced
// colors mode.
kForcedColorsModeBackplate,
// Float phase
kFloat,
// Foreground phase
kForeground,
// Outline phase
//
// Paint outline for the current object and non-self-painting descendants.
kOutline,
//
// Similar to the background phase, the following two values are added for
// painting outlines of the object itself and for descendants.
//
// Paint outline for the current object only.
kSelfOutlineOnly,
// Paint outlines of non-self-painting descendants only. The painter should
// call each non-self-painting child's paint method by passing
// PaintInfo::ForDescendants() which converts kDescendantOutlinesOnly to
// kOutline.
kDescendantOutlinesOnly,
// The below are auxiliary phases which are used to paint special effects.
kOverlayOverflowControls,
kSelectionDragImage,
kTextClip,
kMask,
kMax = kMask,
// These values must be kept in sync with DisplayItem::Type and
// DisplayItem::TypeAsDebugString().
};
inline bool ShouldPaintSelfBlockBackground(PaintPhase phase) {
return phase == PaintPhase::kBlockBackground ||
phase == PaintPhase::kSelfBlockBackgroundOnly;
}
inline bool ShouldPaintSelfOutline(PaintPhase phase) {
return phase == PaintPhase::kOutline || phase == PaintPhase::kSelfOutlineOnly;
}
inline bool ShouldPaintDescendantBlockBackgrounds(PaintPhase phase) {
return phase == PaintPhase::kBlockBackground ||
phase == PaintPhase::kDescendantBlockBackgroundsOnly;
}
inline bool ShouldPaintDescendantOutlines(PaintPhase phase) {
return phase == PaintPhase::kOutline ||
phase == PaintPhase::kDescendantOutlinesOnly;
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_PAINT_PHASE_H_
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