Add support for converting Colors to linear RGB; Fix relevant filters

Source/platform/graphics/ColorSpace.cpp

Index: Source/platform/graphics/ColorSpace.cpp
diff --git a/Source/core/inspector/ScriptCallStack.cpp b/Source/platform/graphics/ColorSpace.cpp
similarity index 56%
copy from Source/core/inspector/ScriptCallStack.cpp
copy to Source/platform/graphics/ColorSpace.cpp
index 0a23bb4fae5e220311cfbca54f8400416864c56c..cb77ac8fead467f9a79b4131842db2b1bd99179d 100644
--- a/Source/core/inspector/ScriptCallStack.cpp
+++ b/Source/platform/graphics/ColorSpace.cpp
@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
+ * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
+ * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -29,59 +31,42 @@
  */
 
 #include "config.h"
-#include "core/inspector/ScriptCallStack.h"
+#include "platform/graphics/ColorSpace.h"
 
+#include "wtf/MathExtras.h"
 
 namespace WebCore {
 
-PassRefPtr<ScriptCallStack> ScriptCallStack::create(Vector<ScriptCallFrame>& frames)
+const Vector<uint8_t>& getLinearRgbLUT()
 {
-    return adoptRef(new ScriptCallStack(frames));
-}
-
-ScriptCallStack::ScriptCallStack(Vector<ScriptCallFrame>& frames)
-{
-    m_frames.swap(frames);
-}
-
-ScriptCallStack::~ScriptCallStack()
-{
-}
-
-const ScriptCallFrame &ScriptCallStack::at(size_t index) const
-{
-    ASSERT(m_frames.size() > index);
-    return m_frames[index];
-}
-
-size_t ScriptCallStack::size() const
-{
-    return m_frames.size();
-}
-
-bool ScriptCallStack::isEqual(ScriptCallStack* o) const
-{
-    if (!o)
-        return false;
-
-    size_t frameCount = o->m_frames.size();
-    if (frameCount != m_frames.size())
-        return false;
-
-    for (size_t i = 0; i < frameCount; ++i) {
-        if (!m_frames[i].isEqual(o->m_frames[i]))
-            return false;
+    DEFINE_STATIC_LOCAL(Vector<uint8_t>, linearRgbLUT, ());
+    if (linearRgbLUT.isEmpty()) {
+        linearRgbLUT.reserveCapacity(256);
+        for (unsigned i = 0; i < 256; i++) {
+            float color = i  / 255.0f;
+            color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) / 1.055f, 2.4f));
+            color = std::max(0.0f, color);
+            color = std::min(1.0f, color);
+            linearRgbLUT.append(static_cast<uint8_t>(round(color * 255)));
+        }
     }
-
-    return true;
+    return linearRgbLUT;
 }
 
-PassRefPtr<TypeBuilder::Array<TypeBuilder::Console::CallFrame> > ScriptCallStack::buildInspectorArray() const
+const Vector<uint8_t>& getDeviceRgbLUT()
 {
-    RefPtr<TypeBuilder::Array<TypeBuilder::Console::CallFrame> > frames = TypeBuilder::Array<TypeBuilder::Console::CallFrame>::create();
-    for (size_t i = 0; i < m_frames.size(); i++)
-        frames->addItem(m_frames.at(i).buildInspectorObject());
-    return frames;
+    DEFINE_STATIC_LOCAL(Vector<uint8_t>, deviceRgbLUT, ());
+    if (deviceRgbLUT.isEmpty()) {
+        deviceRgbLUT.reserveCapacity(256);
+        for (unsigned i = 0; i < 256; i++) {
+            float color = i / 255.0f;
+            color = (powf(color, 1.0f / 2.4f) * 1.055f) - 0.055f;
+            color = std::max(0.0f, color);
+            color = std::min(1.0f, color);
+            deviceRgbLUT.append(static_cast<uint8_t>(round(color * 255)));
+        }
+    }
+    return deviceRgbLUT;
 }
 
 } // namespace WebCore