third_party/WebKit/Source/core/paint/FieldsetPainter.cpp

// 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 "core/paint/FieldsetPainter.h"

#include "core/layout/LayoutFieldset.h"
#include "core/paint/BoxDecorationData.h"
#include "core/paint/BoxPainter.h"
#include "core/paint/LayoutObjectDrawingRecorder.h"
#include "core/paint/PaintInfo.h"
#include "platform/graphics/GraphicsContextStateSaver.h"

namespace blink {

void FieldsetPainter::paintBoxDecorationBackground(
    const PaintInfo& paintInfo,
    const LayoutPoint& paintOffset) {
  LayoutRect paintRect(paintOffset, m_layoutFieldset.size());
  LayoutBox* legend = m_layoutFieldset.findInFlowLegend();
  if (!legend)
    return BoxPainter(m_layoutFieldset)
        .paintBoxDecorationBackground(paintInfo, paintOffset);

  if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(
          paintInfo.context, m_layoutFieldset, paintInfo.phase))
    return;

  // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
  // cases the legend is embedded in the right and bottom borders respectively.
  // https://bugs.webkit.org/show_bug.cgi?id=47236
  if (m_layoutFieldset.style()->isHorizontalWritingMode()) {
    LayoutUnit yOff =
        (legend->location().y() > 0)
            ? LayoutUnit()
            : (legend->size().height() - m_layoutFieldset.borderTop()) / 2;
    paintRect.setHeight(paintRect.height() - yOff);
    paintRect.setY(paintRect.y() + yOff);
  } else {
    LayoutUnit xOff =
        (legend->location().x() > 0)
            ? LayoutUnit()
            : (legend->size().width() - m_layoutFieldset.borderLeft()) / 2;
    paintRect.setWidth(paintRect.width() - xOff);
    paintRect.setX(paintRect.x() + xOff);
  }

  LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutFieldset,
                                       paintInfo.phase, paintRect);
  BoxDecorationData boxDecorationData(m_layoutFieldset);

  if (boxDecorationData.bleedAvoidance == BackgroundBleedNone) {
    BoxPainter::paintNormalBoxShadow(paintInfo, paintRect,
                                     m_layoutFieldset.styleRef());
  }
  BoxPainter(m_layoutFieldset)
      .paintFillLayers(paintInfo, boxDecorationData.backgroundColor,
                       m_layoutFieldset.style()->backgroundLayers(), paintRect);
  BoxPainter::paintInsetBoxShadow(paintInfo, paintRect,
                                  m_layoutFieldset.styleRef());

  if (!boxDecorationData.hasBorderDecoration)
    return;

  // Create a clipping region around the legend and paint the border as normal
  GraphicsContext& graphicsContext = paintInfo.context;
  GraphicsContextStateSaver stateSaver(graphicsContext);

  // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
  // cases the legend is embedded in the right and bottom borders respectively.
  // https://bugs.webkit.org/show_bug.cgi?id=47236
  if (m_layoutFieldset.style()->isHorizontalWritingMode()) {
    LayoutUnit clipTop = paintRect.y();
    LayoutUnit clipHeight =
        max(static_cast<LayoutUnit>(m_layoutFieldset.style()->borderTopWidth()),
            legend->size().height() -
                ((legend->size().height() - m_layoutFieldset.borderTop()) / 2));
    graphicsContext.clipOut(
        pixelSnappedIntRect(paintRect.x() + legend->location().x(), clipTop,
                            legend->size().width(), clipHeight));
  } else {
    LayoutUnit clipLeft = paintRect.x();
    LayoutUnit clipWidth = max(
        static_cast<LayoutUnit>(m_layoutFieldset.style()->borderLeftWidth()),
        legend->size().width());
    graphicsContext.clipOut(
        pixelSnappedIntRect(clipLeft, paintRect.y() + legend->location().y(),
                            clipWidth, legend->size().height()));
  }

  BoxPainter::paintBorder(m_layoutFieldset, paintInfo, paintRect,
                          m_layoutFieldset.styleRef());
}

void FieldsetPainter::paintMask(const PaintInfo& paintInfo,
                                const LayoutPoint& paintOffset) {
  if (m_layoutFieldset.style()->visibility() != EVisibility::kVisible ||
      paintInfo.phase != PaintPhaseMask)
    return;

  LayoutRect paintRect = LayoutRect(paintOffset, m_layoutFieldset.size());
  LayoutBox* legend = m_layoutFieldset.findInFlowLegend();
  if (!legend)
    return BoxPainter(m_layoutFieldset).paintMask(paintInfo, paintOffset);

  if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(
          paintInfo.context, m_layoutFieldset, paintInfo.phase))
    return;

  // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
  // cases the legend is embedded in the right and bottom borders respectively.
  // https://bugs.webkit.org/show_bug.cgi?id=47236
  if (m_layoutFieldset.style()->isHorizontalWritingMode()) {
    LayoutUnit yOff =
        (legend->location().y() > LayoutUnit())
            ? LayoutUnit()
            : (legend->size().height() - m_layoutFieldset.borderTop()) / 2;
    paintRect.expand(LayoutUnit(), -yOff);
    paintRect.move(LayoutUnit(), yOff);
  } else {
    LayoutUnit xOff =
        (legend->location().x() > LayoutUnit())
            ? LayoutUnit()
            : (legend->size().width() - m_layoutFieldset.borderLeft()) / 2;
    paintRect.expand(-xOff, LayoutUnit());
    paintRect.move(xOff, LayoutUnit());
  }

  LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutFieldset,
                                       paintInfo.phase, paintRect);
  BoxPainter(m_layoutFieldset).paintMaskImages(paintInfo, paintRect);
}

}  // namespace blink