third_party/blink/renderer/core/style/basic_shapes.cc

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
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 *    disclaimer.
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 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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#include "third_party/blink/renderer/core/style/basic_shapes.h"

#include "third_party/blink/renderer/platform/geometry/length.h"
#include "third_party/blink/renderer/platform/geometry/length_functions.h"
#include "third_party/blink/renderer/platform/graphics/path.h"
#include "ui/gfx/geometry/rect_f.h"

namespace blink {

gfx::PointF PointForCenterCoordinate(const BasicShapeCenterCoordinate& center_x,
                                     const BasicShapeCenterCoordinate& center_y,
                                     gfx::SizeF box_size) {
  float x = FloatValueForLength(center_x.ComputedLength(), box_size.width());
  float y = FloatValueForLength(center_y.ComputedLength(), box_size.height());
  return gfx::PointF(x, y);
}

bool BasicShapeCircle::IsEqualAssumingSameType(const BasicShape& o) const {
  const BasicShapeCircle& other = To<BasicShapeCircle>(o);
  return center_x_ == other.center_x_ && center_y_ == other.center_y_ &&
         radius_ == other.radius_;
}

float BasicShapeCircle::FloatValueForRadiusInBox(
    const gfx::PointF& center,
    const gfx::SizeF& box_size) const {
  if (radius_.GetType() == BasicShapeRadius::kValue) {
    return FloatValueForLength(
        radius_.Value(),
        hypotf(box_size.width(), box_size.height()) / sqrtf(2));
  }

  float width_delta = std::abs(box_size.width() - center.x());
  float height_delta = std::abs(box_size.height() - center.y());
  if (radius_.GetType() == BasicShapeRadius::kClosestSide) {
    return std::min(std::min(std::abs(center.x()), width_delta),
                    std::min(std::abs(center.y()), height_delta));
  }

  // If radius.type() == BasicShapeRadius::kFarthestSide.
  return std::max(std::max(center.x(), width_delta),
                  std::max(center.y(), height_delta));
}

void BasicShapeCircle::GetPath(Path& path,
                               const gfx::RectF& bounding_box,
                               float zoom) const {
  const gfx::PointF center =
      PointForCenterCoordinate(center_x_, center_y_, bounding_box.size());
  GetPathFromCenter(path, center, bounding_box, zoom);
}

void BasicShapeCircle::GetPathFromCenter(Path& path,
                                         const gfx::PointF& center,
                                         const gfx::RectF& bounding_box,
                                         float) const {
  DCHECK(path.IsEmpty());
  const float radius = FloatValueForRadiusInBox(center, bounding_box.size());
  path.AddEllipse(center + bounding_box.OffsetFromOrigin(), radius, radius);
}

bool BasicShapeEllipse::IsEqualAssumingSameType(const BasicShape& o) const {
  const BasicShapeEllipse& other = To<BasicShapeEllipse>(o);
  return center_x_ == other.center_x_ && center_y_ == other.center_y_ &&
         radius_x_ == other.radius_x_ && radius_y_ == other.radius_y_;
}

float BasicShapeEllipse::FloatValueForRadiusInBox(
    const BasicShapeRadius& radius,
    float center,
    float box_width_or_height) const {
  if (radius.GetType() == BasicShapeRadius::kValue) {
    return FloatValueForLength(radius.Value(), box_width_or_height);
  }

  float width_or_height_delta = std::abs(box_width_or_height - center);
  if (radius.GetType() == BasicShapeRadius::kClosestSide) {
    return std::min(std::abs(center), width_or_height_delta);
  }

  DCHECK_EQ(radius.GetType(), BasicShapeRadius::kFarthestSide);
  return std::max(center, width_or_height_delta);
}

void BasicShapeEllipse::GetPath(Path& path,
                                const gfx::RectF& bounding_box,
                                float zoom) const {
  const gfx::PointF center =
      PointForCenterCoordinate(center_x_, center_y_, bounding_box.size());
  GetPathFromCenter(path, center, bounding_box, zoom);
}

void BasicShapeEllipse::GetPathFromCenter(Path& path,
                                          const gfx::PointF& center,
                                          const gfx::RectF& bounding_box,
                                          float) const {
  DCHECK(path.IsEmpty());
  const float radius_x =
      FloatValueForRadiusInBox(radius_x_, center.x(), bounding_box.width());
  const float radius_y =
      FloatValueForRadiusInBox(radius_y_, center.y(), bounding_box.height());
  path.AddEllipse(center + bounding_box.OffsetFromOrigin(), radius_x, radius_y);
}

void BasicShapePolygon::GetPath(Path& path,
                                const gfx::RectF& bounding_box,
                                float) const {
  DCHECK(path.IsEmpty());
  DCHECK(!(values_.size() % 2));
  wtf_size_t length = values_.size();

  path.SetWindRule(wind_rule_);
  if (!length) {
    return;
  }

  path.MoveTo(
      gfx::PointF(FloatValueForLength(values_.at(0), bounding_box.width()) +
                      bounding_box.x(),
                  FloatValueForLength(values_.at(1), bounding_box.height()) +
                      bounding_box.y()));
  for (wtf_size_t i = 2; i < length; i = i + 2) {
    path.AddLineTo(gfx::PointF(
        FloatValueForLength(values_.at(i), bounding_box.width()) +
            bounding_box.x(),
        FloatValueForLength(values_.at(i + 1), bounding_box.height()) +
            bounding_box.y()));
  }
  path.CloseSubpath();
}

bool BasicShapePolygon::IsEqualAssumingSameType(const BasicShape& o) const {
  const BasicShapePolygon& other = To<BasicShapePolygon>(o);
  return wind_rule_ == other.wind_rule_ && values_ == other.values_;
}

bool BasicShapeInset::IsEqualAssumingSameType(const BasicShape& o) const {
  const auto& other = To<BasicShapeInset>(o);
  return right_ == other.right_ && top_ == other.top_ &&
         bottom_ == other.bottom_ && left_ == other.left_ &&
         top_left_radius_ == other.top_left_radius_ &&
         top_right_radius_ == other.top_right_radius_ &&
         bottom_right_radius_ == other.bottom_right_radius_ &&
         bottom_left_radius_ == other.bottom_left_radius_;
}

void BasicShapeInset::GetPath(Path& path,
                              const gfx::RectF& bounding_box,
                              float) const {
  DCHECK(path.IsEmpty());
  float left = FloatValueForLength(left_, bounding_box.width());
  float top = FloatValueForLength(top_, bounding_box.height());
  gfx::RectF rect(
      left + bounding_box.x(), top + bounding_box.y(),
      std::max<float>(bounding_box.width() - left -
                          FloatValueForLength(right_, bounding_box.width()),
                      0),
      std::max<float>(bounding_box.height() - top -
                          FloatValueForLength(bottom_, bounding_box.height()),
                      0));
  gfx::SizeF box_size = bounding_box.size();
  auto radii = FloatRoundedRect::Radii(
      SizeForLengthSize(top_left_radius_, box_size),
      SizeForLengthSize(top_right_radius_, box_size),
      SizeForLengthSize(bottom_left_radius_, box_size),
      SizeForLengthSize(bottom_right_radius_, box_size));

  FloatRoundedRect final_rect(rect, radii);
  final_rect.ConstrainRadii();
  path.AddRoundedRect(final_rect);
}

}  // namespace blink