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, 163 insertions, 0 deletions

diff --git a/third_party/agg23/agg_renderer_base.h b/third_party/agg23/agg_renderer_base.h
new file mode 100644
index 0000000000..bd1b203b9a
--- /dev/null
+++ b/third_party/agg23/agg_renderer_base.h
@@ -0,0 +1,163 @@
+
+//----------------------------------------------------------------------------
+// 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
+//----------------------------------------------------------------------------
+//
+// class renderer_base
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_RENDERER_BASE_INCLUDED
+#define AGG_RENDERER_BASE_INCLUDED
+#include "agg_basics.h"
+#include "agg_rendering_buffer.h"
+namespace agg
+{
+template<class PixelFormat> class renderer_base 
+{
+public:
+    typedef PixelFormat pixfmt_type;
+    typedef typename pixfmt_type::color_type color_type;
+    typedef typename pixfmt_type::row_data row_data;
+    typedef typename pixfmt_type::span_data span_data;
+    renderer_base() : m_ren(0), m_clip_box(1, 1, 0, 0) {}
+    renderer_base(pixfmt_type& ren) :
+        m_ren(&ren),
+        m_clip_box(0, 0, ren.width() - 1, ren.height() - 1)
+    {}
+    void attach(pixfmt_type& ren)
+    {
+        m_ren = &ren;
+        m_clip_box = rect(0, 0, ren.width() - 1, ren.height() - 1);
+    }
+    const pixfmt_type& ren() const
+    {
+        return *m_ren;
+    }
+    pixfmt_type& ren()
+    {
+        return *m_ren;
+    }
+    unsigned width()  const
+    {
+        return m_ren->width();
+    }
+    unsigned height() const
+    {
+        return m_ren->height();
+    }
+    void first_clip_box() {}
+    bool next_clip_box()
+    {
+        return false;
+    }
+    const rect& clip_box() const
+    {
+        return m_clip_box;
+    }
+    int         xmin()     const
+    {
+        return m_clip_box.x1;
+    }
+    int         ymin()     const
+    {
+        return m_clip_box.y1;
+    }
+    int         xmax()     const
+    {
+        return m_clip_box.x2;
+    }
+    int         ymax()     const
+    {
+        return m_clip_box.y2;
+    }
+    const rect& bounding_clip_box() const
+    {
+        return m_clip_box;
+    }
+    int         bounding_xmin()     const
+    {
+        return m_clip_box.x1;
+    }
+    int         bounding_ymin()     const
+    {
+        return m_clip_box.y1;
+    }
+    int         bounding_xmax()     const
+    {
+        return m_clip_box.x2;
+    }
+    int         bounding_ymax()     const
+    {
+        return m_clip_box.y2;
+    }
+    void blend_hline(int x1, int y, int x2,
+                     const color_type& c, cover_type cover)
+    {
+        if(x1 > x2) {
+            int t = x2;
+            x2 = x1;
+            x1 = t;
+        }
+        if(y  > ymax()) {
+            return;
+        }
+        if(y  < ymin()) {
+            return;
+        }
+        if(x1 > xmax()) {
+            return;
+        }
+        if(x2 < xmin()) {
+            return;
+        }
+        if(x1 < xmin()) {
+            x1 = xmin();
+        }
+        if(x2 > xmax()) {
+            x2 = xmax();
+        }
+        m_ren->blend_hline(x1, y, x2 - x1 + 1, c, cover);
+    }
+    void blend_solid_hspan(int x, int y, int len,
+                           const color_type& c,
+                           const cover_type* covers)
+    {
+        if(y > ymax()) {
+            return;
+        }
+        if(y < ymin()) {
+            return;
+        }
+        if(x < xmin()) {
+            len -= xmin() - x;
+            if(len <= 0) {
+                return;
+            }
+            covers += xmin() - x;
+            x = xmin();
+        }
+        if(x + len > xmax()) {
+            len = xmax() - x + 1;
+            if(len <= 0) {
+                return;
+            }
+        }
+        m_ren->blend_solid_hspan(x, y, len, c, covers);
+    }
+private:
+    pixfmt_type* m_ren;
+    rect         m_clip_box;
+};
+}
+#endif