add gpu backend (not hooked up yet)

git-svn-id: http://skia.googlecode.com/svn/trunk@649 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 59 insertions, 0 deletions

diff --git a/gpu/include/FlingState.h b/gpu/include/FlingState.h
new file mode 100644
index 0000000000..a1da4fbc86
--- /dev/null
+++ b/gpu/include/FlingState.h
@@ -0,0 +1,59 @@
+/*
+    Copyright 2010 Google Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+ */
+
+
+#ifndef SkFlingState_DEFINED
+#define SkFlingState_DEFINED
+
+#include "SkScalar.h"
+#include "SkPoint.h"
+
+class SkMatrix;
+
+struct FlingState {
+    FlingState() : fActive(false) {}
+
+    bool isActive() const { return fActive; }
+    void stop() { fActive = false; }
+
+    void reset(float sx, float sy);
+    bool evaluateMatrix(SkMatrix* matrix);
+
+private:
+    SkPoint     fDirection;
+    SkScalar    fSpeed0;
+    double      fTime0;
+    bool        fActive;
+};
+
+class GrAnimateFloat {
+public:
+    GrAnimateFloat();
+
+    void start(float v0, float v1, float duration);
+    bool isActive() const { return fTime0 != 0; }
+    void stop() { fTime0 = 0; }
+
+    float evaluate();
+
+private:
+    float   fValue0, fValue1, fDuration;
+    SkMSec  fTime0;
+};
+
+#endif
+
+