Floating point based Point/Size/Rect and Insets

ui/gfx/rect_f.cc

Index: ui/gfx/rect_f.cc
diff --git a/ui/gfx/rect_f.cc b/ui/gfx/rect_f.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d6bbe285a4f864b531b6c0563c3fd8dd01b7b0b9
--- /dev/null
+++ b/ui/gfx/rect_f.cc
@@ -0,0 +1,204 @@
+// Copyright (c) 2012 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 "ui/gfx/rect_f.h"
+
+#include "base/logging.h"
+#include "base/stringprintf.h"
+#include "ui/gfx/insets_f.h"
+
+namespace {
+
+void AdjustAlongAxis(float dst_origin,
+                     float dst_size,
+                     float* origin,
+                     float* size) {
+  *size = std::min(dst_size, *size);
+  if (*origin < dst_origin)
+    *origin = dst_origin;
+  else
+    *origin = std::min(dst_origin + dst_size, *origin + *size) - *size;
+}
+
+} // namespace
+
+namespace gfx {
+
+RectF::RectF() {
+}
+
+RectF::RectF(float width, float height)
+    : size_(width, height) {
+}
+
+RectF::RectF(float x, float y, float width, float height)
+    : origin_(x, y), size_(width, height) {
+}
+
+RectF::RectF(const gfx::SizeF& size)
+    : size_(size) {
+}
+
+RectF::RectF(const gfx::PointF& origin, const gfx::SizeF& size)
+    : origin_(origin), size_(size) {
+}
+
+RectF::~RectF() {}
+
+void RectF::SetRect(float x, float y, float width, float height) {
+  origin_.SetPoint(x, y);
+  set_width(width);
+  set_height(height);
+}
+
+void RectF::Inset(const gfx::InsetsF& insets) {
+  Inset(insets.left(), insets.top(), insets.right(), insets.bottom());
+}
+
+void RectF::Inset(float left, float top, float right, float bottom) {
+  Offset(left, top);
+  set_width(std::max(width() - left - right, 0.0f));
+  set_height(std::max(height() - top - bottom, 0.0f));
+}
+
+void RectF::Offset(float horizontal, float vertical) {
+  origin_.Offset(horizontal, vertical);
+}
+
+bool RectF::operator==(const RectF& other) const {
+  return origin_ == other.origin_ && size_ == other.size_;
+}
+
+bool RectF::operator<(const RectF& other) const {
+  if (origin_ == other.origin_) {
+    if (width() == other.width()) {
+      return height() < other.height();
+    } else {
+      return width() < other.width();
+    }
+  } else {
+    return origin_ < other.origin_;
+  }
+}
+
+bool RectF::Contains(float point_x, float point_y) const {
+  return (point_x >= x()) && (point_x < right()) &&
+         (point_y >= y()) && (point_y < bottom());
+}
+
+bool RectF::Contains(const RectF& rect) const {
+  return (rect.x() >= x() && rect.right() <= right() &&
+          rect.y() >= y() && rect.bottom() <= bottom());
+}
+
+bool RectF::Intersects(const RectF& rect) const {
+  return !(rect.x() >= right() || rect.right() <= x() ||
+           rect.y() >= bottom() || rect.bottom() <= y());
+}
+
+RectF RectF::Intersect(const RectF& rect) const {
+  float rx = std::max(x(), rect.x());
+  float ry = std::max(y(), rect.y());
+  float rr = std::min(right(), rect.right());
+  float rb = std::min(bottom(), rect.bottom());
+
+  if (rx >= rr || ry >= rb)
+    rx = ry = rr = rb = 0;  // non-intersecting
+
+  return RectF(rx, ry, rr - rx, rb - ry);
+}
+
+RectF RectF::Union(const RectF& rect) const {
+  // special case empty rects...
+  if (IsEmpty())
+    return rect;
+  if (rect.IsEmpty())
+    return *this;
+
+  float rx = std::min(x(), rect.x());
+  float ry = std::min(y(), rect.y());
+  float rr = std::max(right(), rect.right());
+  float rb = std::max(bottom(), rect.bottom());
+
+  return RectF(rx, ry, rr - rx, rb - ry);
+}
+
+RectF RectF::Subtract(const RectF& rect) const {
+  // boundary cases:
+  if (!Intersects(rect))
+    return *this;
+  if (rect.Contains(*this))
+    return RectF();
+
+  float rx = x();
+  float ry = y();
+  float rr = right();
+  float rb = bottom();
+
+  if (rect.y() <= y() && rect.bottom() >= bottom()) {
+    // complete intersection in the y-direction
+    if (rect.x() <= x()) {
+      rx = rect.right();
+    } else {
+      rr = rect.x();
+    }
+  } else if (rect.x() <= x() && rect.right() >= right()) {
+    // complete intersection in the x-direction
+    if (rect.y() <= y()) {
+      ry = rect.bottom();
+    } else {
+      rb = rect.y();
+    }
+  }
+  return RectF(rx, ry, rr - rx, rb - ry);
+}
+
+RectF RectF::AdjustToFit(const RectF& rect) const {
+  float new_x = x();
+  float new_y = y();
+  float new_width = width();
+  float new_height = height();
+  AdjustAlongAxis(rect.x(), rect.width(), &new_x, &new_width);
+  AdjustAlongAxis(rect.y(), rect.height(), &new_y, &new_height);
+  return RectF(new_x, new_y, new_width, new_height);
+}
+
+PointF RectF::CenterPoint() const {
+  return PointF(x() + (width() - 1) / 2, y() + (height() - 1) / 2);
+}
+
+RectF RectF::Center(const gfx::SizeF& size) const {
+  float new_width = std::min(width(), size.width());
+  float new_height = std::min(height(), size.height());
+  float new_x = x() + (width() - new_width) / 2;
+  float new_y = y() + (height() - new_height) / 2;
+  return RectF(new_x, new_y, new_width, new_height);
+}
+
+void RectF::SplitVertically(gfx::RectF* left_half,
+                            gfx::RectF* right_half) const {
+  DCHECK(left_half);
+  DCHECK(right_half);
+
+  left_half->SetRect(this->x(), this->y(), this->width() / 2, this->height());
+  right_half->SetRect(left_half->right(),
+                      this->y(),
+                      this->width() - left_half->width(),
+                      this->height());
+}
+
+bool RectF::SharesEdgeWith(const gfx::RectF& rect) const {
+  return (y() == rect.y() && height() == rect.height() &&
+             (x() == rect.right() || right() == rect.x())) ||
+         (x() == rect.x() && width() == rect.width() &&
+             (y() == rect.bottom() || bottom() == rect.y()));
+}
+
+std::string RectF::ToString() const {
+  return base::StringPrintf("%s %s",
+                            origin_.ToString().c_str(),
+                            size_.ToString().c_str());
+}
+
+}  // namespace gfx