Code drop from //branches/cupcake/...@124589

1 files changed, 149 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/Gradient.cpp b/WebCore/platform/graphics/Gradient.cpp
new file mode 100644
index 0000000..2e6a5d2
--- /dev/null
+++ b/WebCore/platform/graphics/Gradient.cpp
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Alp Toker <alp@atoker.com>
+ *
+ * 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. 
+ */
+
+#include "config.h"
+#include "Gradient.h"
+
+#include "Color.h"
+
+namespace WebCore {
+
+Gradient::Gradient(const FloatPoint& p0, const FloatPoint& p1)
+    : m_radial(false)
+    , m_p0(p0)
+    , m_p1(p1)
+    , m_r0(0)
+    , m_r1(0)
+    , m_stopsSorted(false)
+    , m_lastStop(0)
+{
+    platformInit();
+}
+
+Gradient::Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1)
+    : m_radial(true)
+    , m_p0(p0)
+    , m_p1(p1)
+    , m_r0(r0)
+    , m_r1(r1)
+    , m_stopsSorted(false)
+    , m_lastStop(0)
+{
+    platformInit();
+}
+
+Gradient::~Gradient()
+{
+    platformDestroy();
+}
+
+void Gradient::addColorStop(float value, const Color& color)
+{
+    float r;
+    float g;
+    float b;
+    float a;
+    color.getRGBA(r, g, b, a);
+    m_stops.append(ColorStop(value, r, g, b, a));
+
+    m_stopsSorted = false;
+
+    platformDestroy();
+}
+
+static inline bool compareStops(const Gradient::ColorStop& a, const Gradient::ColorStop& b)
+{
+    return a.stop < b.stop;
+}
+
+void Gradient::getColor(float value, float* r, float* g, float* b, float* a) const
+{
+    ASSERT(value >= 0);
+    ASSERT(value <= 1);
+
+    if (m_stops.isEmpty()) {
+        *r = 0;
+        *g = 0;
+        *b = 0;
+        *a = 0;
+        return;
+    }
+    if (!m_stopsSorted) {
+        if (m_stops.size())
+            std::stable_sort(m_stops.begin(), m_stops.end(), compareStops);
+        m_stopsSorted = true;
+    }
+    if (value <= 0 || value <= m_stops.first().stop) {
+        *r = m_stops.first().red;
+        *g = m_stops.first().green;
+        *b = m_stops.first().blue;
+        *a = m_stops.first().alpha;
+        return;
+    }
+    if (value >= 1 || value >= m_stops.last().stop) {
+        *r = m_stops.last().red;
+        *g = m_stops.last().green;
+        *b = m_stops.last().blue;
+        *a = m_stops.last().alpha;
+        return;
+    }
+
+    // Find stop before and stop after and interpolate.
+    int stop = findStop(value);
+    const ColorStop& lastStop = m_stops[stop];    
+    const ColorStop& nextStop = m_stops[stop + 1];
+    float stopFraction = (value - lastStop.stop) / (nextStop.stop - lastStop.stop);
+    *r = lastStop.red + (nextStop.red - lastStop.red) * stopFraction;
+    *g = lastStop.green + (nextStop.green - lastStop.green) * stopFraction;
+    *b = lastStop.blue + (nextStop.blue - lastStop.blue) * stopFraction;
+    *a = lastStop.alpha + (nextStop.alpha - lastStop.alpha) * stopFraction;
+}
+
+int Gradient::findStop(float value) const
+{
+    ASSERT(value >= 0);
+    ASSERT(value <= 1);
+    ASSERT(m_stopsSorted);
+
+    int numStops = m_stops.size();
+    ASSERT(numStops >= 2);
+    ASSERT(m_lastStop < numStops - 1);
+
+    int i = m_lastStop;
+    if (value < m_stops[i].stop)
+        i = 1;
+    else
+        i = m_lastStop + 1;
+
+    for (; i < numStops - 1; ++i)
+        if (value < m_stops[i].stop)
+            break;
+
+    m_lastStop = i - 1;
+    return m_lastStop;
+}
+
+} //namespace