Merge to XFA: Separate agg-authored code from fx-authored code.

Original Review URL: https://codereview.chromium.org/1152743007.
BUG=pdfium:166
R=brucedawson@chromium.org, thestig@chromium.org
TBR=brucedawson@chromium.org, thestig@chromium.org

Review URL: https://codereview.chromium.org/1186423003.

1 files changed, 109 insertions, 0 deletions

diff --git a/third_party/agg23/agg_curves.cpp b/third_party/agg23/agg_curves.cpp
new file mode 100644
index 0000000000..5a2d5631d6
--- /dev/null
+++ b/third_party/agg23/agg_curves.cpp
@@ -0,0 +1,109 @@
+
+//----------------------------------------------------------------------------
+// XYQ: 2006-01-22 Copied from AGG project.
+// TODO: This file uses intensive floating point operations, so it's NOT suitable
+// for platforms like Symbian OS. We need to change to FIX format.
+//----------------------------------------------------------------------------
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software
+// is granted provided this copyright notice appears in all copies.
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+#include "../../core/include/fxcrt/fx_basic.h"
+#include "agg_curves.h"
+#include "agg_math.h"
+namespace agg
+{
+const FX_FLOAT curve_collinearity_epsilon              = 1e-30f;
+enum curve_recursion_limit_e { curve_recursion_limit = 16 };
+void curve4_div::init(FX_FLOAT x1, FX_FLOAT y1,
+                      FX_FLOAT x2, FX_FLOAT y2,
+                      FX_FLOAT x3, FX_FLOAT y3,
+                      FX_FLOAT x4, FX_FLOAT y4)
+{
+    m_points.remove_all();
+    m_distance_tolerance_square = 1.0f / 4;
+    m_distance_tolerance_manhattan = 1.0f * 4;
+    bezier(x1, y1, x2, y2, x3, y3, x4, y4);
+    m_count = 0;
+}
+void curve4_div::recursive_bezier(FX_FLOAT x1, FX_FLOAT y1,
+                                  FX_FLOAT x2, FX_FLOAT y2,
+                                  FX_FLOAT x3, FX_FLOAT y3,
+                                  FX_FLOAT x4, FX_FLOAT y4,
+                                  unsigned level)
+{
+    if(level > curve_recursion_limit) {
+        return;
+    }
+    FX_FLOAT x12   = (x1 + x2) / 2;
+    FX_FLOAT y12   = (y1 + y2) / 2;
+    FX_FLOAT x23   = (x2 + x3) / 2;
+    FX_FLOAT y23   = (y2 + y3) / 2;
+    FX_FLOAT x34   = (x3 + x4) / 2;
+    FX_FLOAT y34   = (y3 + y4) / 2;
+    FX_FLOAT x123  = (x12 + x23) / 2;
+    FX_FLOAT y123  = (y12 + y23) / 2;
+    FX_FLOAT x234  = (x23 + x34) / 2;
+    FX_FLOAT y234  = (y23 + y34) / 2;
+    FX_FLOAT x1234 = (x123 + x234) / 2;
+    FX_FLOAT y1234 = (y123 + y234) / 2;
+    FX_FLOAT dx = x4 - x1;
+    FX_FLOAT dy = y4 - y1;
+    FX_FLOAT d2 = FXSYS_fabs(FXSYS_Mul(x2 - x4, dy) - FXSYS_Mul(y2 - y4, dx));
+    FX_FLOAT d3 = FXSYS_fabs(FXSYS_Mul(x3 - x4, dy) - FXSYS_Mul(y3 - y4, dx));
+    switch((int(d2 > curve_collinearity_epsilon) << 1) +
+            int(d3 > curve_collinearity_epsilon)) {
+        case 0:
+            if(FXSYS_fabs(x1 + x3 - x2 - x2) +
+                    FXSYS_fabs(y1 + y3 - y2 - y2) +
+                    FXSYS_fabs(x2 + x4 - x3 - x3) +
+                    FXSYS_fabs(y2 + y4 - y3 - y3) <= m_distance_tolerance_manhattan) {
+                m_points.add(point_type(x1234, y1234, path_flags_jr));
+                return;
+            }
+            break;
+        case 1:
+            if(FXSYS_Mul(d3, d3) <= FXSYS_Mul(m_distance_tolerance_square,
+                                              FXSYS_Mul(dx, dx) + FXSYS_Mul(dy, dy))) {
+                m_points.add(point_type(x23, y23, path_flags_jr));
+                return;
+            }
+            break;
+        case 2:
+            if(FXSYS_Mul(d2, d2) <= FXSYS_Mul(m_distance_tolerance_square,
+                                              FXSYS_Mul(dx, dx) + FXSYS_Mul(dy, dy))) {
+                m_points.add(point_type(x23, y23, path_flags_jr));
+                return;
+            }
+            break;
+        case 3:
+            if(FXSYS_Mul(d2 + d3, d2 + d3) <= FXSYS_Mul(m_distance_tolerance_square,
+                    FXSYS_Mul(dx, dx) + FXSYS_Mul(dy, dy))) {
+                m_points.add(point_type(x23, y23, path_flags_jr));
+                return;
+            }
+            break;
+    }
+    recursive_bezier(x1, y1, x12, y12, x123, y123, x1234, y1234, level + 1);
+    recursive_bezier(x1234, y1234, x234, y234, x34, y34, x4, y4, level + 1);
+}
+void curve4_div::bezier(FX_FLOAT x1, FX_FLOAT y1,
+                        FX_FLOAT x2, FX_FLOAT y2,
+                        FX_FLOAT x3, FX_FLOAT y3,
+                        FX_FLOAT x4, FX_FLOAT y4)
+{
+    m_points.add(point_type(x1, y1));
+    recursive_bezier(x1, y1, x2, y2, x3, y3, x4, y4, 0);
+    m_points.add(point_type(x4, y4));
+}
+}