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, 138 insertions, 0 deletions

diff --git a/third_party/agg23/agg_conv_adaptor_vcgen.h b/third_party/agg23/agg_conv_adaptor_vcgen.h
new file mode 100644
index 0000000000..0d8d6ff99e
--- /dev/null
+++ b/third_party/agg23/agg_conv_adaptor_vcgen.h
@@ -0,0 +1,138 @@
+
+//----------------------------------------------------------------------------
+// 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
+//----------------------------------------------------------------------------
+#ifndef AGG_CONV_ADAPTOR_VCGEN_INCLUDED
+#define AGG_CONV_ADAPTOR_VCGEN_INCLUDED
+#include "agg_basics.h"
+namespace agg
+{
+struct null_markers  {
+    void remove_all() {}
+    void add_vertex(FX_FLOAT, FX_FLOAT, unsigned) {}
+    void prepare_src() {}
+    void rewind(unsigned) {}
+    unsigned vertex(FX_FLOAT*, FX_FLOAT*)
+    {
+        return path_cmd_stop;
+    }
+};
+template<class VertexSource,
+         class Generator,
+         class Markers = null_markers> class conv_adaptor_vcgen 
+{
+    enum status {
+        initial,
+        accumulate,
+        generate
+    };
+public:
+    conv_adaptor_vcgen(VertexSource& source) :
+        m_source(&source),
+        m_status(initial)
+    {}
+    void set_source(VertexSource& source)
+    {
+        m_source = &source;
+    }
+    Generator& generator()
+    {
+        return m_generator;
+    }
+    const Generator& generator() const
+    {
+        return m_generator;
+    }
+    Markers& markers()
+    {
+        return m_markers;
+    }
+    const Markers& markers() const
+    {
+        return m_markers;
+    }
+    void rewind(unsigned path_id)
+    {
+        m_source->rewind(path_id);
+        m_status = initial;
+    }
+    unsigned vertex(FX_FLOAT* x, FX_FLOAT* y);
+private:
+    conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
+    const conv_adaptor_vcgen<VertexSource, Generator, Markers>&
+    operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
+    VertexSource* m_source;
+    Generator     m_generator;
+    Markers       m_markers;
+    status        m_status;
+    unsigned      m_last_cmd;
+    FX_FLOAT        m_start_x;
+    FX_FLOAT        m_start_y;
+};
+template<class VertexSource, class Generator, class Markers>
+unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(FX_FLOAT* x, FX_FLOAT* y)
+{
+    unsigned cmd = path_cmd_stop;
+    bool done = false;
+    while(!done) {
+        switch(m_status) {
+            case initial:
+                m_markers.remove_all();
+                m_last_cmd = m_source->vertex(&m_start_x, &m_start_y);
+                m_status = accumulate;
+            case accumulate:
+                if(is_stop(m_last_cmd)) {
+                    return path_cmd_stop;
+                }
+                m_generator.remove_all();
+                m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
+                m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
+                for(;;) {
+                    cmd = m_source->vertex(x, y);
+                    if(is_vertex(cmd)) {
+                        m_last_cmd = cmd;
+                        if(is_move_to(cmd)) {
+                            m_start_x = *x;
+                            m_start_y = *y;
+                            break;
+                        }
+                        m_generator.add_vertex(*x, *y, cmd);
+                        m_markers.add_vertex(*x, *y, path_cmd_line_to);
+                    } else {
+                        if(is_stop(cmd)) {
+                            m_last_cmd = path_cmd_stop;
+                            break;
+                        }
+                        if(is_end_poly(cmd)) {
+                            m_generator.add_vertex(*x, *y, cmd);
+                            break;
+                        }
+                    }
+                }
+                m_generator.rewind(0);
+                m_status = generate;
+            case generate:
+                cmd = m_generator.vertex(x, y);
+                if(is_stop(cmd)) {
+                    m_status = accumulate;
+                    break;
+                }
+                done = true;
+                break;
+        }
+    }
+    return cmd;
+}
+}
+#endif