third_party/blink/renderer/core/paint/svg_mask_painter.cc

// Copyright 2015 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/svg_mask_painter.h"

#include "third_party/blink/renderer/core/layout/svg/layout_svg_resource_masker.h"
#include "third_party/blink/renderer/core/paint/object_paint_properties.h"
#include "third_party/blink/renderer/core/paint/paint_info.h"
#include "third_party/blink/renderer/platform/graphics/paint/drawing_display_item.h"
#include "third_party/blink/renderer/platform/graphics/paint/drawing_recorder.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_controller.h"
#include "third_party/blink/renderer/platform/graphics/paint/scoped_paint_chunk_properties.h"

namespace blink {

bool SVGMaskPainter::PrepareEffect(const LayoutObject& object,
                                   GraphicsContext& context) {
  DCHECK(mask_.Style());
  SECURITY_DCHECK(!mask_.NeedsLayout());

  mask_.ClearInvalidationMask();
  return mask_.GetElement()->HasChildren();
}

void SVGMaskPainter::FinishEffect(const LayoutObject& object,
                                  GraphicsContext& context) {
  DCHECK(mask_.Style());
  SECURITY_DCHECK(!mask_.NeedsLayout());

  base::Optional<ScopedPaintChunkProperties> scoped_paint_chunk_properties;
  const auto* properties = object.FirstFragment().PaintProperties();
  // TODO(crbug.com/814815): This condition should be a DCHECK, but for now
  // we may paint the object for filters during PrePaint before the
  // properties are ready.
  if (properties && properties->Mask()) {
    scoped_paint_chunk_properties.emplace(context.GetPaintController(),
                                          properties->Mask(), object,
                                          DisplayItem::kSVGMask);
  }

  AffineTransform content_transformation;
  sk_sp<const PaintRecord> record = mask_.CreatePaintRecord(
      content_transformation, object.ObjectBoundingBox(), context);

  if (DrawingRecorder::UseCachedDrawingIfPossible(context, object,
                                                  DisplayItem::kSVGMask))
    return;

  DrawingRecorder recorder(context, object, DisplayItem::kSVGMask);
  context.Save();
  context.ConcatCTM(content_transformation);
  context.DrawRecord(std::move(record));
  context.Restore();
}

}  // namespace blink