skia/ext/opacity_draw_filter.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 SKIA_EXT_OPACITY_DRAW_FILTER_H
   6 #define SKIA_EXT_OPACITY_DRAW_FILTER_H
   7
   8 #include "base/values.h"
   9 #include "third_party/skia/include/core/SkDrawFilter.h"
  10
  11 class SkPaint;
  12
  13 namespace skia {
  14
  15 // This filter allows setting an opacity on every draw call to a canvas, and to
  16 // disable image filtering. Note that the opacity setting is only correct in
  17 // very limited conditions: when there is only zero or one opaque, nonlayer
  18 // draw for every pixel in the surface.
  19 class SK_API OpacityDrawFilter : public SkDrawFilter {
  20  public:
  21   OpacityDrawFilter(float opacity, bool disable_image_filtering);
  22   virtual ~OpacityDrawFilter();
  23   virtual bool filter(SkPaint* paint, SkDrawFilter::Type type) OVERRIDE;
  24
  25  private:
  26   int alpha_;
  27   bool disable_image_filtering_;
  28 };
  29
  30 }  // namespace skia
  31
  32 #endif  // SKIA_EXT_OPACITY_DRAW_FILTER_H
  33