This is the first pass at themes.

This CL is paired with http://codereview.chromium.org/67284

This CL (for commit purposes) includes http://codereview.chromium.org/67284

BUG=4463,11232,11233,11234,11235

Review URL: http://codereview.chromium.org/99030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15704 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 25 insertions, 2 deletions

diff --git a/skia/ext/skia_utils.h b/skia/ext/skia_utils.h
index 98fa1b0..0f61b18 100644
--- a/skia/ext/skia_utils.h
+++ b/skia/ext/skia_utils.h
@@ -10,6 +10,12 @@
 
 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();
@@ -22,10 +28,27 @@ SkShader* CreateGradientShader(int start_point,
                                SkColor end_color);
 
 // Convert a premultiplied SkColor to a HSL value.
-void SkColorToHSL(SkPMColor c, float hsl[3]);
+void SkColorToHSL(SkPMColor c, HSL& hsl);
 
 // Convert a HSL color to a premultiplied SkColor.
-SkPMColor HSLToSKColor(U8CPU alpha, float hsl[3]);
+SkPMColor HSLToSKColor(U8CPU alpha, HSL hsl);
+
+// Shift an HSL value. 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(skia::HSL hsl, skia::HSL shift);
 
 }  // namespace skia