cc/output/filter_operation.h

   1 // Copyright 2013 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 #ifndef CC_OUTPUT_FILTER_OPERATION_H_
   6 #define CC_OUTPUT_FILTER_OPERATION_H_
   7
   8 #include "base/logging.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "cc/base/cc_export.h"
  11 #include "skia/ext/refptr.h"
  12 #include "third_party/skia/include/core/SkColor.h"
  13 #include "third_party/skia/include/core/SkImageFilter.h"
  14 #include "third_party/skia/include/core/SkRegion.h"
  15 #include "third_party/skia/include/core/SkScalar.h"
  16 #include "ui/gfx/geometry/point.h"
  17
  18 namespace base {
  19 namespace trace_event {
  20 class TracedValue;
  21 }
  22 class Value;
  23 }
  24
  25 namespace cc {
  26
  27 class CC_EXPORT FilterOperation {
  28  public:
  29   enum FilterType {
  30     GRAYSCALE,
  31     SEPIA,
  32     SATURATE,
  33     HUE_ROTATE,
  34     INVERT,
  35     BRIGHTNESS,
  36     CONTRAST,
  37     OPACITY,
  38     BLUR,
  39     DROP_SHADOW,
  40     COLOR_MATRIX,
  41     ZOOM,
  42     REFERENCE,
  43     SATURATING_BRIGHTNESS,  // Not used in CSS/SVG.
  44     ALPHA_THRESHOLD,  // Not used in CSS/SVG.
  45     FILTER_TYPE_LAST = ALPHA_THRESHOLD
  46   };
  47
  48   FilterOperation(const FilterOperation& other);
  49
  50   ~FilterOperation();
  51
  52   FilterType type() const { return type_; }
  53
  54   float amount() const {
  55     DCHECK_NE(type_, COLOR_MATRIX);
  56     DCHECK_NE(type_, REFERENCE);
  57     return amount_;
  58   }
  59
  60   float outer_threshold() const {
  61     DCHECK_EQ(type_, ALPHA_THRESHOLD);
  62     return outer_threshold_;
  63   }
  64
  65   gfx::Point drop_shadow_offset() const {
  66     DCHECK_EQ(type_, DROP_SHADOW);
  67     return drop_shadow_offset_;
  68   }
  69
  70   SkColor drop_shadow_color() const {
  71     DCHECK_EQ(type_, DROP_SHADOW);
  72     return drop_shadow_color_;
  73   }
  74
  75   skia::RefPtr<SkImageFilter> image_filter() const {
  76     DCHECK_EQ(type_, REFERENCE);
  77     return image_filter_;
  78   }
  79
  80   const SkScalar* matrix() const {
  81     DCHECK_EQ(type_, COLOR_MATRIX);
  82     return matrix_;
  83   }
  84
  85   int zoom_inset() const {
  86     DCHECK_EQ(type_, ZOOM);
  87     return zoom_inset_;
  88   }
  89
  90   const SkRegion& region() const {
  91     DCHECK_EQ(type_, ALPHA_THRESHOLD);
  92     return region_;
  93   }
  94
  95   static FilterOperation CreateGrayscaleFilter(float amount) {
  96     return FilterOperation(GRAYSCALE, amount);
  97   }
  98
  99   static FilterOperation CreateSepiaFilter(float amount) {
 100     return FilterOperation(SEPIA, amount);
 101   }
 102
 103   static FilterOperation CreateSaturateFilter(float amount) {
 104     return FilterOperation(SATURATE, amount);
 105   }
 106
 107   static FilterOperation CreateHueRotateFilter(float amount) {
 108     return FilterOperation(HUE_ROTATE, amount);
 109   }
 110
 111   static FilterOperation CreateInvertFilter(float amount) {
 112     return FilterOperation(INVERT, amount);
 113   }
 114
 115   static FilterOperation CreateBrightnessFilter(float amount) {
 116     return FilterOperation(BRIGHTNESS, amount);
 117   }
 118
 119   static FilterOperation CreateContrastFilter(float amount) {
 120     return FilterOperation(CONTRAST, amount);
 121   }
 122
 123   static FilterOperation CreateOpacityFilter(float amount) {
 124     return FilterOperation(OPACITY, amount);
 125   }
 126
 127   static FilterOperation CreateBlurFilter(float amount) {
 128     return FilterOperation(BLUR, amount);
 129   }
 130
 131   static FilterOperation CreateDropShadowFilter(const gfx::Point& offset,
 132                                                 float std_deviation,
 133                                                 SkColor color) {
 134     return FilterOperation(DROP_SHADOW, offset, std_deviation, color);
 135   }
 136
 137   static FilterOperation CreateColorMatrixFilter(SkScalar matrix[20]) {
 138     return FilterOperation(COLOR_MATRIX, matrix);
 139   }
 140
 141   static FilterOperation CreateZoomFilter(float amount, int inset) {
 142     return FilterOperation(ZOOM, amount, inset);
 143   }
 144
 145   static FilterOperation CreateReferenceFilter(
 146       const skia::RefPtr<SkImageFilter>& image_filter) {
 147     return FilterOperation(REFERENCE, image_filter);
 148   }
 149
 150   static FilterOperation CreateSaturatingBrightnessFilter(float amount) {
 151     return FilterOperation(SATURATING_BRIGHTNESS, amount);
 152   }
 153
 154   static FilterOperation CreateAlphaThresholdFilter(const SkRegion& region,
 155                                                     float inner_threshold,
 156                                                     float outer_threshold) {
 157     return FilterOperation(ALPHA_THRESHOLD, region,
 158                            inner_threshold, outer_threshold);
 159   }
 160
 161   bool operator==(const FilterOperation& other) const;
 162
 163   bool operator!=(const FilterOperation& other) const {
 164     return !(*this == other);
 165   }
 166
 167   // Methods for restoring a FilterOperation.
 168   static FilterOperation CreateEmptyFilter() {
 169     return FilterOperation(GRAYSCALE, 0.f);
 170   }
 171
 172   void set_type(FilterType type) { type_ = type; }
 173
 174   void set_amount(float amount) {
 175     DCHECK_NE(type_, COLOR_MATRIX);
 176     DCHECK_NE(type_, REFERENCE);
 177     amount_ = amount;
 178   }
 179
 180   void set_outer_threshold(float outer_threshold) {
 181     DCHECK_EQ(type_, ALPHA_THRESHOLD);
 182     outer_threshold_ = outer_threshold;
 183   }
 184
 185   void set_drop_shadow_offset(const gfx::Point& offset) {
 186     DCHECK_EQ(type_, DROP_SHADOW);
 187     drop_shadow_offset_ = offset;
 188   }
 189
 190   void set_drop_shadow_color(SkColor color) {
 191     DCHECK_EQ(type_, DROP_SHADOW);
 192     drop_shadow_color_ = color;
 193   }
 194
 195   void set_image_filter(const skia::RefPtr<SkImageFilter>& image_filter) {
 196     DCHECK_EQ(type_, REFERENCE);
 197     image_filter_ = image_filter;
 198   }
 199
 200   void set_matrix(const SkScalar matrix[20]) {
 201     DCHECK_EQ(type_, COLOR_MATRIX);
 202     for (unsigned i = 0; i < 20; ++i)
 203       matrix_[i] = matrix[i];
 204   }
 205
 206   void set_zoom_inset(int inset) {
 207     DCHECK_EQ(type_, ZOOM);
 208     zoom_inset_ = inset;
 209   }
 210
 211   void set_region(const SkRegion& region) {
 212     DCHECK_EQ(type_, ALPHA_THRESHOLD);
 213     region_ = region;
 214   }
 215
 216   // Given two filters of the same type, returns a filter operation created by
 217   // linearly interpolating a |progress| fraction from |from| to |to|. If either
 218   // |from| or |to| (but not both) is null, it is treated as a no-op filter of
 219   // the same type as the other given filter. If both |from| and |to| are null,
 220   // or if |from| and |to| are non-null but of different types, returns a
 221   // no-op filter.
 222   static FilterOperation Blend(const FilterOperation* from,
 223                                const FilterOperation* to,
 224                                double progress);
 225
 226   void AsValueInto(base::trace_event::TracedValue* value) const;
 227
 228  private:
 229   FilterOperation(FilterType type, float amount);
 230
 231   FilterOperation(FilterType type,
 232                   const gfx::Point& offset,
 233                   float stdDeviation,
 234                   SkColor color);
 235
 236   FilterOperation(FilterType, SkScalar matrix[20]);
 237
 238   FilterOperation(FilterType type, float amount, int inset);
 239
 240   FilterOperation(FilterType type,
 241                   const skia::RefPtr<SkImageFilter>& image_filter);
 242
 243   FilterOperation(FilterType type,
 244                   const SkRegion& region,
 245                   float inner_threshold,
 246                   float outer_threshold);
 247
 248   FilterType type_;
 249   float amount_;
 250   float outer_threshold_;
 251   gfx::Point drop_shadow_offset_;
 252   SkColor drop_shadow_color_;
 253   skia::RefPtr<SkImageFilter> image_filter_;
 254   SkScalar matrix_[20];
 255   int zoom_inset_;
 256   SkRegion region_;
 257 };
 258
 259 }  // namespace cc
 260
 261 #endif  // CC_OUTPUT_FILTER_OPERATION_H_