grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/animator/SkDisplayRandom.cpp b/src/animator/SkDisplayRandom.cpp
new file mode 100644
index 0000000..ab078cd
--- /dev/null
+++ b/src/animator/SkDisplayRandom.cpp
@@ -0,0 +1,80 @@
+/* libs/graphics/animator/SkDisplayRandom.cpp
+**
+** Copyright 2006, The Android Open Source Project
+**
+** 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.
+*/
+
+#include "SkDisplayRandom.h"
+#include "SkInterpolator.h"
+
+enum SkDisplayRandom_Properties {
+ SK_PROPERTY(random),
+ SK_PROPERTY(seed)
+};
+
+#if SK_USE_CONDENSED_INFO == 0
+
+const SkMemberInfo SkDisplayRandom::fInfo[] = {
+ SK_MEMBER(blend, Float),
+ SK_MEMBER(max, Float),
+ SK_MEMBER(min, Float),
+ SK_MEMBER_DYNAMIC_PROPERTY(random, Float),
+ SK_MEMBER_PROPERTY(seed, Int)
+};
+
+#endif
+
+DEFINE_GET_MEMBER(SkDisplayRandom);
+
+SkDisplayRandom::SkDisplayRandom() : blend(0), min(0), max(SK_Scalar1) {
+}
+
+#ifdef SK_DUMP_ENABLED
+void SkDisplayRandom::dump(SkAnimateMaker* maker) {
+ dumpBase(maker);
+#ifdef SK_CAN_USE_FLOAT
+ SkDebugf("min=\"%g\" ", SkScalarToFloat(min));
+ SkDebugf("max=\"%g\" ", SkScalarToFloat(max));
+ SkDebugf("blend=\"%g\" ", SkScalarToFloat(blend));
+#else
+ SkDebugf("min=\"%x\" ", min);
+ SkDebugf("max=\"%x\" ", max);
+ SkDebugf("blend=\"%x\" ", blend);
+#endif
+ SkDebugf("/>\n");
+}
+#endif
+
+bool SkDisplayRandom::getProperty(int index, SkScriptValue* value) const {
+ switch(index) {
+ case SK_PROPERTY(random): {
+ SkScalar random = fRandom.nextUScalar1();
+ SkScalar relativeT = SkUnitCubicInterp(random, SK_Scalar1 - blend, 0, 0, SK_Scalar1 - blend);
+ value->fOperand.fScalar = min + SkScalarMul(max - min, relativeT);
+ value->fType = SkType_Float;
+ return true;
+ }
+ default:
+ SkASSERT(0);
+ }
+ return false;
+}
+
+bool SkDisplayRandom::setProperty(int index, SkScriptValue& value) {
+ SkASSERT(index == SK_PROPERTY(seed));
+ SkASSERT(value.fType == SkType_Int);
+ fRandom.setSeed(value.fOperand.fS32);
+ return true;
+}
+