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, 145 insertions, 0 deletions

diff --git a/third_party/agg23/agg_rendering_buffer.h b/third_party/agg23/agg_rendering_buffer.h
new file mode 100644
index 0000000000..9c1c0c6899
--- /dev/null
+++ b/third_party/agg23/agg_rendering_buffer.h
@@ -0,0 +1,145 @@
+
+//----------------------------------------------------------------------------
+// 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 rendering_buffer
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_RENDERING_BUFFER_INCLUDED
+#define AGG_RENDERING_BUFFER_INCLUDED
+#include "agg_basics.h"
+namespace agg
+{
+class rendering_buffer 
+{
+public:
+    struct row_data  {
+        int x1, x2;
+        const int8u* ptr;
+        row_data() {}
+        row_data(int x1_, int x2_, const int8u* ptr_) :
+            x1(x1_), x2(x2_), ptr(ptr_) {}
+    };
+    struct span_data  {
+        int x;
+        unsigned len;
+        int8u* ptr;
+        span_data() {}
+        span_data(int) : x(0), len(0), ptr(0) {}
+        span_data(int x_, unsigned len_, int8u* ptr_) :
+            x(x_), len(len_), ptr(ptr_) {}
+    };
+    ~rendering_buffer()
+    {
+        FX_Free(m_rows);
+    }
+    rendering_buffer() :
+        m_buf(0),
+        m_rows(0),
+        m_width(0),
+        m_height(0),
+        m_stride(0),
+        m_max_height(0)
+    {
+    }
+    rendering_buffer(int8u* buf, unsigned width, unsigned height, int stride) :
+        m_buf(0),
+        m_rows(0),
+        m_width(0),
+        m_height(0),
+        m_stride(0),
+        m_max_height(0)
+    {
+        attach(buf, width, height, stride);
+    }
+    void attach(int8u* buf, unsigned width, unsigned height, int stride)
+    {
+        m_buf = buf;
+        m_width = width;
+        m_height = height;
+        m_stride = stride;
+        if(height > m_max_height) {
+            FX_Free(m_rows);
+            m_rows = FX_Alloc(int8u*, m_max_height = height);
+        }
+        int8u* row_ptr = m_buf;
+        if(stride < 0) {
+            row_ptr = m_buf - int(height - 1) * stride;
+        }
+        int8u** rows = m_rows;
+        while(height--) {
+            *rows++ = row_ptr;
+            row_ptr += stride;
+        }
+    }
+    int8u* buf()
+    {
+        return m_buf;
+    }
+    const int8u* buf()    const
+    {
+        return m_buf;
+    }
+    unsigned width()  const
+    {
+        return m_width;
+    }
+    unsigned height() const
+    {
+        return m_height;
+    }
+    int      stride() const
+    {
+        return m_stride;
+    }
+    unsigned stride_abs() const
+    {
+        return (m_stride < 0) ?
+               unsigned(-m_stride) :
+               unsigned(m_stride);
+    }
+    int8u* row(unsigned y)
+    {
+        return m_rows[y];
+    }
+    const int8u* row(unsigned y) const
+    {
+        return m_rows[y];
+    }
+    int8u* next_row(void* p)
+    {
+        return (int8u*)p + m_stride;
+    }
+    const int8u* next_row(const void* p) const
+    {
+        return (int8u*)p + m_stride;
+    }
+    int8u const* const* rows() const
+    {
+        return m_rows;
+    }
+private:
+    rendering_buffer(const rendering_buffer&);
+    const rendering_buffer& operator = (const rendering_buffer&);
+private:
+    int8u*       m_buf;
+    int8u**      m_rows;
+    unsigned m_width;
+    unsigned m_height;
+    int      m_stride;
+    unsigned m_max_height;
+};
+}
+#endif