1 files changed, 78 insertions, 0 deletions
diff --git a/xfa/fxgraphics/cxfa_shading.cpp b/xfa/fxgraphics/cxfa_shading.cpp
new file mode 100644
index 0000000000..599a3f9d42
--- /dev/null
+++ b/xfa/fxgraphics/cxfa_shading.cpp
@@ -0,0 +1,78 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "xfa/fxgraphics/cxfa_shading.h"
+
+CXFA_Shading::CXFA_Shading(const CFX_PointF& beginPoint,
+                           const CFX_PointF& endPoint,
+                           bool isExtendedBegin,
+                           bool isExtendedEnd,
+                           const FX_ARGB beginArgb,
+                           const FX_ARGB endArgb)
+    : m_type(FX_SHADING_Axial),
+      m_beginPoint(beginPoint),
+      m_endPoint(endPoint),
+      m_beginRadius(0),
+      m_endRadius(0),
+      m_isExtendedBegin(isExtendedBegin),
+      m_isExtendedEnd(isExtendedEnd),
+      m_beginArgb(beginArgb),
+      m_endArgb(endArgb) {
+  InitArgbArray();
+}
+
+CXFA_Shading::CXFA_Shading(const CFX_PointF& beginPoint,
+                           const CFX_PointF& endPoint,
+                           const float beginRadius,
+                           const float endRadius,
+                           bool isExtendedBegin,
+                           bool isExtendedEnd,
+                           const FX_ARGB beginArgb,
+                           const FX_ARGB endArgb)
+    : m_type(FX_SHADING_Radial),
+      m_beginPoint(beginPoint),
+      m_endPoint(endPoint),
+      m_beginRadius(beginRadius),
+      m_endRadius(endRadius),
+      m_isExtendedBegin(isExtendedBegin),
+      m_isExtendedEnd(isExtendedEnd),
+      m_beginArgb(beginArgb),
+      m_endArgb(endArgb) {
+  InitArgbArray();
+}
+
+CXFA_Shading::~CXFA_Shading() {}
+
+void CXFA_Shading::InitArgbArray() {
+  int32_t a1;
+  int32_t r1;
+  int32_t g1;
+  int32_t b1;
+  std::tie(a1, r1, g1, b1) = ArgbDecode(m_beginArgb);
+
+  int32_t a2;
+  int32_t r2;
+  int32_t g2;
+  int32_t b2;
+  std::tie(a2, r2, g2, b2) = ArgbDecode(m_endArgb);
+
+  float f = static_cast<float>(FX_SHADING_Steps - 1);
+  float aScale = 1.0 * (a2 - a1) / f;
+  float rScale = 1.0 * (r2 - r1) / f;
+  float gScale = 1.0 * (g2 - g1) / f;
+  float bScale = 1.0 * (b2 - b1) / f;
+
+  for (int32_t i = 0; i < FX_SHADING_Steps; i++) {
+    int32_t a3 = static_cast<int32_t>(i * aScale);
+    int32_t r3 = static_cast<int32_t>(i * rScale);
+    int32_t g3 = static_cast<int32_t>(i * gScale);
+    int32_t b3 = static_cast<int32_t>(i * bScale);
+
+    // TODO(dsinclair): Add overloads for FX_ARGB. pdfium:437
+    m_argbArray[i] =
+        FXARGB_TODIB(FXARGB_MAKE(a1 + a3, r1 + r3, g1 + g3, b1 + b3));
+  }
+}