ui/gfx/shadow_value.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gfx/shadow_value.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/strings/stringprintf.h"
  10 #include "ui/gfx/geometry/insets.h"
  11 #include "ui/gfx/geometry/vector2d_conversions.h"
  12
  13 namespace gfx {
  14
  15 ShadowValue::ShadowValue()
  16     : blur_(0),
  17       color_(0) {
  18 }
  19
  20 ShadowValue::ShadowValue(const gfx::Vector2d& offset,
  21                          double blur,
  22                          SkColor color)
  23     : offset_(offset), blur_(blur), color_(color) {
  24 }
  25
  26 ShadowValue::~ShadowValue() {
  27 }
  28
  29 ShadowValue ShadowValue::Scale(float scale) const {
  30   gfx::Vector2d scaled_offset =
  31       gfx::ToFlooredVector2d(gfx::ScaleVector2d(offset_, scale));
  32   return ShadowValue(scaled_offset, blur_ * scale, color_);
  33 }
  34
  35 std::string ShadowValue::ToString() const {
  36   return base::StringPrintf(
  37       "(%d,%d),%.2f,rgba(%d,%d,%d,%d)",
  38       offset_.x(), offset_.y(),
  39       blur_,
  40       SkColorGetR(color_),
  41       SkColorGetG(color_),
  42       SkColorGetB(color_),
  43       SkColorGetA(color_));
  44 }
  45
  46 // static
  47 Insets ShadowValue::GetMargin(const ShadowValues& shadows) {
  48   int left = 0;
  49   int top = 0;
  50   int right = 0;
  51   int bottom = 0;
  52
  53   for (size_t i = 0; i < shadows.size(); ++i) {
  54     const ShadowValue& shadow = shadows[i];
  55
  56     // Add 0.5 to round up to the next integer.
  57     int blur = static_cast<int>(shadow.blur() / 2 + 0.5);
  58
  59     left = std::max(left, blur - shadow.x());
  60     top = std::max(top, blur - shadow.y());
  61     right = std::max(right, blur + shadow.x());
  62     bottom = std::max(bottom, blur + shadow.y());
  63   }
  64
  65   return Insets(-top, -left, -bottom, -right);
  66 }
  67
  68 }  // namespace gfx