diff options
Diffstat (limited to 'skia/ext/skia_utils.h')
| -rw-r--r-- | skia/ext/skia_utils.h | 34 |
1 files changed, 31 insertions, 3 deletions
diff --git a/skia/ext/skia_utils.h b/skia/ext/skia_utils.h index 52d9d62..769d9d4 100644 --- a/skia/ext/skia_utils.h +++ b/skia/ext/skia_utils.h @@ -1,4 +1,4 @@ -// Copyright (c) 2009 The Chromium Authors. All rights reserved. +// Copyright (c) 2006-2008 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. @@ -6,11 +6,16 @@ #define SKIA_EXT_SKIA_UTILS_H_ #include "third_party/skia/include/core/SkColor.h" - -class SkShader; +#include "third_party/skia/include/core/SkShader.h" namespace skia { +struct HSL { + double h; + double s; + double l; +}; + // Creates a vertical gradient shader. The caller owns the shader. // Example usage to avoid leaks: // paint.setShader(gfx::CreateGradientShader(0, 10, red, blue))->safeUnref(); @@ -21,6 +26,29 @@ SkShader* CreateGradientShader(int start_point, int end_point, SkColor start_color, SkColor end_color); + +// Convert an SkColor to a HSL value. +void SkColorToHSL(SkColor c, HSL& hsl); + +// Convert a HSL color to an SkColor. +SkColor HSLToSkColor(U8CPU alpha, HSL hsl); + +// HSL-Shift an SkColor. The shift values are in the range of 0-1, with the +// option to specify -1 for 'no change'. The shift values are defined as: +// hsl_shift[0] (hue): The absolute hue value - 0 and 1 map +// to 0 and 360 on the hue color wheel (red). +// hsl_shift[1] (saturation): A saturation shift, with the +// following key values: +// 0 = remove all color. +// 0.5 = leave unchanged. +// 1 = fully saturate the image. +// hsl_shift[2] (lightness): A lightness shift, with the +// following key values: +// 0 = remove all lightness (make all pixels black). +// 0.5 = leave unchanged. +// 1 = full lightness (make all pixels white). +SkColor HSLShift(SkColor color, skia::HSL shift); + } // namespace skia #endif // SKIA_EXT_SKIA_UTILS_H_ |