1 files changed, 62 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/platform/graphics/color_blend.h b/chromium/third_party/blink/renderer/platform/graphics/color_blend.h
new file mode 100644
index 00000000000..dc03dea5d42
--- /dev/null
+++ b/chromium/third_party/blink/renderer/platform/graphics/color_blend.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_
+
+#include "third_party/blink/renderer/platform/animation/animation_utilities.h"
+#include "third_party/blink/renderer/platform/graphics/color.h"
+
+namespace blink {
+
+inline Color Blend(const Color& from,
+                   const Color& to,
+                   double progress,
+                   bool blend_premultiplied = true) {
+  if (blend_premultiplied) {
+    // Contrary to the name, RGBA32 actually stores ARGB, so we can initialize
+    // Color directly from premultipliedARGBFromColor(). Also,
+    // premultipliedARGBFromColor() bails on zero alpha, so special-case that.
+    Color premult_from = from.Alpha() ? PremultipliedARGBFromColor(from) : 0;
+    Color premult_to = to.Alpha() ? PremultipliedARGBFromColor(to) : 0;
+
+    Color premult_blended(
+        Blend(premult_from.Red(), premult_to.Red(), progress),
+        Blend(premult_from.Green(), premult_to.Green(), progress),
+        Blend(premult_from.Blue(), premult_to.Blue(), progress),
+        Blend(premult_from.Alpha(), premult_to.Alpha(), progress));
+
+    return Color(ColorFromPremultipliedARGB(premult_blended.Rgb()));
+  }
+
+  return Color(Blend(from.Red(), to.Red(), progress),
+               Blend(from.Green(), to.Green(), progress),
+               Blend(from.Blue(), to.Blue(), progress),
+               Blend(from.Alpha(), to.Alpha(), progress));
+}
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_