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/point_conversions.h"
  12
  13 namespace gfx {
  14
  15 ShadowValue::ShadowValue()
  16     : blur_(0),
  17       color_(0) {
  18 }
  19
  20 ShadowValue::ShadowValue(const gfx::Point& offset,
  21                          double blur,
  22                          SkColor color)
  23     : offset_(offset),
  24       blur_(blur),
  25       color_(color) {
  26 }
  27
  28 ShadowValue::~ShadowValue() {
  29 }
  30
  31 ShadowValue ShadowValue::Scale(float scale) const {
  32   gfx::Point scaled_offset =
  33       gfx::ToFlooredPoint(gfx::ScalePoint(offset_, scale));
  34   return ShadowValue(scaled_offset, blur_ * scale, color_);
  35 }
  36
  37 std::string ShadowValue::ToString() const {
  38   return base::StringPrintf(
  39       "(%d,%d),%.2f,rgba(%d,%d,%d,%d)",
  40       offset_.x(), offset_.y(),
  41       blur_,
  42       SkColorGetR(color_),
  43       SkColorGetG(color_),
  44       SkColorGetB(color_),
  45       SkColorGetA(color_));
  46 }
  47
  48 // static
  49 Insets ShadowValue::GetMargin(const ShadowValues& shadows) {
  50   int left = 0;
  51   int top = 0;
  52   int right = 0;
  53   int bottom = 0;
  54
  55   for (size_t i = 0; i < shadows.size(); ++i) {
  56     const ShadowValue& shadow = shadows[i];
  57
  58     // Add 0.5 to round up to the next integer.
  59     int blur = static_cast<int>(shadow.blur() / 2 + 0.5);
  60
  61     left = std::max(left, blur - shadow.x());
  62     top = std::max(top, blur - shadow.y());
  63     right = std::max(right, blur + shadow.x());
  64     bottom = std::max(bottom, blur + shadow.y());
  65   }
  66
  67   return Insets(-top, -left, -bottom, -right);
  68 }
  69
  70 }  // namespace gfx