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, 489 insertions, 0 deletions

diff --git a/third_party/agg23/agg_rasterizer_scanline_aa.cpp b/third_party/agg23/agg_rasterizer_scanline_aa.cpp
new file mode 100644
index 0000000000..8216e60221
--- /dev/null
+++ b/third_party/agg23/agg_rasterizer_scanline_aa.cpp
@@ -0,0 +1,489 @@
+
+//----------------------------------------------------------------------------
+// XYQ: 2006-01-22 Copied from AGG project.
+// This file uses only integer data, so it's suitable for all platforms.
+//----------------------------------------------------------------------------
+//----------------------------------------------------------------------------
+// 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.
+//
+//----------------------------------------------------------------------------
+//
+// The author gratefully acknowleges the support of David Turner,
+// Robert Wilhelm, and Werner Lemberg - the authors of the FreeType
+// libray - in producing this work. See http://www.freetype.org for details.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Adaptation for 32-bit screen coordinates has been sponsored by
+// Liberty Technology Systems, Inc., visit http://lib-sys.com
+//
+// Liberty Technology Systems, Inc. is the provider of
+// PostScript and PDF technology for software developers.
+//
+//----------------------------------------------------------------------------
+//
+// Class outline_aa - implementation.
+//
+// Initially the rendering algorithm was designed by David Turner and the
+// other authors of the FreeType library - see the above notice. I nearly
+// created a similar renderer, but still I was far from David's work.
+// I completely redesigned the original code and adapted it for Anti-Grain
+// ideas. Two functions - render_line and render_hline are the core of
+// the algorithm - they calculate the exact coverage of each pixel cell
+// of the polygon. I left these functions almost as is, because there's
+// no way to improve the perfection - hats off to David and his group!
+//
+// All other code is very different from the original.
+//
+//----------------------------------------------------------------------------
+#include "../../core/include/fxcrt/fx_ext.h"
+#include <limits.h>
+#include "agg_rasterizer_scanline_aa.h"
+namespace agg
+{
+AGG_INLINE void cell_aa::set_cover(int c, int a)
+{
+    cover = c;
+    area = a;
+}
+AGG_INLINE void cell_aa::add_cover(int c, int a)
+{
+    cover += c;
+    area += a;
+}
+AGG_INLINE void cell_aa::set_coord(int cx, int cy)
+{
+    x = cx;
+    y = cy;
+}
+AGG_INLINE void cell_aa::set(int cx, int cy, int c, int a)
+{
+    x = cx;
+    y = cy;
+    cover = c;
+    area = a;
+}
+outline_aa::~outline_aa()
+{
+    if(m_num_blocks) {
+        cell_aa** ptr = m_cells + m_num_blocks - 1;
+        while(m_num_blocks--) {
+            FX_Free(*ptr);
+            ptr--;
+        }
+        FX_Free(m_cells);
+    }
+}
+outline_aa::outline_aa() :
+    m_num_blocks(0),
+    m_max_blocks(0),
+    m_cur_block(0),
+    m_num_cells(0),
+    m_cells(0),
+    m_cur_cell_ptr(0),
+    m_cur_x(0),
+    m_cur_y(0),
+    m_min_x(0x7FFFFFFF),
+    m_min_y(0x7FFFFFFF),
+    m_max_x(-0x7FFFFFFF),
+    m_max_y(-0x7FFFFFFF),
+    m_sorted(false)
+{
+    m_cur_cell.set(0x7FFF, 0x7FFF, 0, 0);
+}
+void outline_aa::reset()
+{
+    m_num_cells = 0;
+    m_cur_block = 0;
+    m_cur_cell.set(0x7FFF, 0x7FFF, 0, 0);
+    m_sorted = false;
+    m_min_x =  0x7FFFFFFF;
+    m_min_y =  0x7FFFFFFF;
+    m_max_x = -0x7FFFFFFF;
+    m_max_y = -0x7FFFFFFF;
+}
+void outline_aa::allocate_block()
+{
+    if(m_cur_block >= m_num_blocks) {
+        if(m_num_blocks >= m_max_blocks) {
+            cell_aa** new_cells = FX_Alloc( cell_aa*, m_max_blocks + cell_block_pool);
+            if(m_cells) {
+                FXSYS_memcpy(new_cells, m_cells, m_max_blocks * sizeof(cell_aa*));
+                FX_Free(m_cells);
+            }
+            m_cells = new_cells;
+            m_max_blocks += cell_block_pool;
+        }
+        m_cells[m_num_blocks++] = FX_Alloc(cell_aa, cell_block_size);
+    }
+    m_cur_cell_ptr = m_cells[m_cur_block++];
+}
+AGG_INLINE void outline_aa::add_cur_cell()
+{
+    if(m_cur_cell.area | m_cur_cell.cover) {
+        if((m_num_cells & cell_block_mask) == 0) {
+            if(m_num_blocks >= cell_block_limit) {
+                return;
+            }
+            allocate_block();
+        }
+        *m_cur_cell_ptr++ = m_cur_cell;
+        ++m_num_cells;
+    }
+}
+AGG_INLINE void outline_aa::set_cur_cell(int x, int y)
+{
+    if(m_cur_cell.x != x || m_cur_cell.y != y) {
+        add_cur_cell();
+        m_cur_cell.set(x, y, 0, 0);
+        if(x < m_min_x) {
+            m_min_x = x;
+        }
+        if(x > m_max_x) {
+            m_max_x = x;
+        }
+        if(y < m_min_y) {
+            m_min_y = y;
+        }
+        if(y > m_max_y) {
+            m_max_y = y;
+        }
+    }
+}
+AGG_INLINE void outline_aa::render_hline(int ey, int x1, int y1, int x2, int y2)
+{
+    int ex1 = x1 >> poly_base_shift;
+    int ex2 = x2 >> poly_base_shift;
+    int fx1 = x1 & poly_base_mask;
+    int fx2 = x2 & poly_base_mask;
+    int delta, p, first, dx;
+    int incr, lift, mod, rem;
+    if(y1 == y2) {
+        set_cur_cell(ex2, ey);
+        return;
+    }
+    if(ex1 == ex2) {
+        delta = y2 - y1;
+        m_cur_cell.add_cover(delta, (fx1 + fx2) * delta);
+        return;
+    }
+    p     = (poly_base_size - fx1) * (y2 - y1);
+    first = poly_base_size;
+    incr  = 1;
+    dx = x2 - x1;
+    if(dx < 0) {
+        p     = fx1 * (y2 - y1);
+        first = 0;
+        incr  = -1;
+        dx    = -dx;
+    }
+    delta = p / dx;
+    mod   = p % dx;
+    if(mod < 0) {
+        delta--;
+        mod += dx;
+    }
+    m_cur_cell.add_cover(delta, (fx1 + first) * delta);
+    ex1 += incr;
+    set_cur_cell(ex1, ey);
+    y1  += delta;
+    if(ex1 != ex2) {
+        p     = poly_base_size * (y2 - y1 + delta);
+        lift  = p / dx;
+        rem   = p % dx;
+        if (rem < 0) {
+            lift--;
+            rem += dx;
+        }
+        mod -= dx;
+        while (ex1 != ex2) {
+            delta = lift;
+            mod  += rem;
+            if(mod >= 0) {
+                mod -= dx;
+                delta++;
+            }
+            m_cur_cell.add_cover(delta, (poly_base_size) * delta);
+            y1  += delta;
+            ex1 += incr;
+            set_cur_cell(ex1, ey);
+        }
+    }
+    delta = y2 - y1;
+    m_cur_cell.add_cover(delta, (fx2 + poly_base_size - first) * delta);
+}
+void outline_aa::render_line(int x1, int y1, int x2, int y2)
+{
+    enum dx_limit_e { dx_limit = 16384 << poly_base_shift };
+    int dx = x2 - x1;
+    if(dx >= dx_limit || dx <= -dx_limit) {
+        int cx = (x1 + x2) >> 1;
+        int cy = (y1 + y2) >> 1;
+        render_line(x1, y1, cx, cy);
+        render_line(cx, cy, x2, y2);
+    }
+    int dy = y2 - y1;
+    int ey1 = y1 >> poly_base_shift;
+    int ey2 = y2 >> poly_base_shift;
+    int fy1 = y1 & poly_base_mask;
+    int fy2 = y2 & poly_base_mask;
+    int x_from, x_to;
+    int p, rem, mod, lift, delta, first, incr;
+    if(ey1 == ey2) {
+        render_hline(ey1, x1, fy1, x2, fy2);
+        return;
+    }
+    incr  = 1;
+    if(dx == 0) {
+        int ex = x1 >> poly_base_shift;
+        int two_fx = (x1 - (ex << poly_base_shift)) << 1;
+        int area;
+        first = poly_base_size;
+        if(dy < 0) {
+            first = 0;
+            incr  = -1;
+        }
+        x_from = x1;
+        delta = first - fy1;
+        m_cur_cell.add_cover(delta, two_fx * delta);
+        ey1 += incr;
+        set_cur_cell(ex, ey1);
+        delta = first + first - poly_base_size;
+        area = two_fx * delta;
+        while(ey1 != ey2) {
+            m_cur_cell.set_cover(delta, area);
+            ey1 += incr;
+            set_cur_cell(ex, ey1);
+        }
+        delta = fy2 - poly_base_size + first;
+        m_cur_cell.add_cover(delta, two_fx * delta);
+        return;
+    }
+    p     = (poly_base_size - fy1) * dx;
+    first = poly_base_size;
+    if(dy < 0) {
+        p     = fy1 * dx;
+        first = 0;
+        incr  = -1;
+        dy    = -dy;
+    }
+    delta = p / dy;
+    mod   = p % dy;
+    if(mod < 0) {
+        delta--;
+        mod += dy;
+    }
+    x_from = x1 + delta;
+    render_hline(ey1, x1, fy1, x_from, first);
+    ey1 += incr;
+    set_cur_cell(x_from >> poly_base_shift, ey1);
+    if(ey1 != ey2) {
+        p     = poly_base_size * dx;
+        lift  = p / dy;
+        rem   = p % dy;
+        if(rem < 0) {
+            lift--;
+            rem += dy;
+        }
+        mod -= dy;
+        while(ey1 != ey2) {
+            delta = lift;
+            mod  += rem;
+            if (mod >= 0) {
+                mod -= dy;
+                delta++;
+            }
+            x_to = x_from + delta;
+            render_hline(ey1, x_from, poly_base_size - first, x_to, first);
+            x_from = x_to;
+            ey1 += incr;
+            set_cur_cell(x_from >> poly_base_shift, ey1);
+        }
+    }
+    render_hline(ey1, x_from, poly_base_size - first, x2, fy2);
+}
+void outline_aa::move_to(int x, int y)
+{
+    if(m_sorted) {
+        reset();
+    }
+    set_cur_cell(x >> poly_base_shift, y >> poly_base_shift);
+    m_cur_x = x;
+    m_cur_y = y;
+}
+void outline_aa::line_to(int x, int y)
+{
+    render_line(m_cur_x, m_cur_y, x, y);
+    m_cur_x = x;
+    m_cur_y = y;
+    m_sorted = false;
+}
+template <class T> static AGG_INLINE void swap_cells(T* a, T* b)
+{
+    T temp = *a;
+    *a = *b;
+    *b = temp;
+}
+enum {
+    qsort_threshold = 9
+};
+static void qsort_cells(cell_aa** start, unsigned num)
+{
+    cell_aa**  stack[80];
+    cell_aa*** top;
+    cell_aa**  limit;
+    cell_aa**  base;
+    limit = start + num;
+    base  = start;
+    top   = stack;
+    for (;;) {
+        int len = int(limit - base);
+        cell_aa** i;
+        cell_aa** j;
+        cell_aa** pivot;
+        if(len > qsort_threshold) {
+            pivot = base + len / 2;
+            swap_cells(base, pivot);
+            i = base + 1;
+            j = limit - 1;
+            if((*j)->x < (*i)->x) {
+                swap_cells(i, j);
+            }
+            if((*base)->x < (*i)->x) {
+                swap_cells(base, i);
+            }
+            if((*j)->x < (*base)->x) {
+                swap_cells(base, j);
+            }
+            for(;;) {
+                int x = (*base)->x;
+                do {
+                    i++;
+                } while( (*i)->x < x );
+                do {
+                    j--;
+                } while( x < (*j)->x );
+                if(i > j) {
+                    break;
+                }
+                swap_cells(i, j);
+            }
+            swap_cells(base, j);
+            if(j - base > limit - i) {
+                top[0] = base;
+                top[1] = j;
+                base   = i;
+            } else {
+                top[0] = i;
+                top[1] = limit;
+                limit  = j;
+            }
+            top += 2;
+        } else {
+            j = base;
+            i = j + 1;
+            for(; i < limit; j = i, i++) {
+                for(; j[1]->x < (*j)->x; j--) {
+                    swap_cells(j + 1, j);
+                    if (j == base) {
+                        break;
+                    }
+                }
+            }
+            if(top > stack) {
+                top  -= 2;
+                base  = top[0];
+                limit = top[1];
+            } else {
+                break;
+            }
+        }
+    }
+}
+void outline_aa::sort_cells()
+{
+    if(m_sorted) {
+        return;
+    }
+    add_cur_cell();
+    if(m_num_cells == 0) {
+        return;
+    }
+    m_sorted_cells.allocate(m_num_cells, 16);
+    if (m_max_y > 0 && m_min_y < 0 && -m_min_y > INT_MAX - m_max_y) {
+        return;
+    }
+    unsigned size = m_max_y - m_min_y;
+    if (size + 1 < size) {
+        return;
+    }
+    size++;
+    m_sorted_y.allocate(size, 16);
+    m_sorted_y.zero();
+    cell_aa** block_ptr = m_cells;
+    cell_aa*  cell_ptr = NULL;
+    unsigned nb = m_num_cells >> cell_block_shift;
+    unsigned i;
+    while(nb--) {
+        cell_ptr = *block_ptr++;
+        i = cell_block_size;
+        while(i--) {
+            m_sorted_y[cell_ptr->y - m_min_y].start++;
+            ++cell_ptr;
+        }
+    }
+    i = m_num_cells & cell_block_mask;
+    if (i) {
+        cell_ptr = *block_ptr++;
+    }
+    while(i--) {
+        m_sorted_y[cell_ptr->y - m_min_y].start++;
+        ++cell_ptr;
+    }
+    unsigned start = 0;
+    for(i = 0; i < m_sorted_y.size(); i++) {
+        unsigned v = m_sorted_y[i].start;
+        m_sorted_y[i].start = start;
+        start += v;
+    }
+    block_ptr = m_cells;
+    nb = m_num_cells >> cell_block_shift;
+    while(nb--) {
+        cell_ptr = *block_ptr++;
+        i = cell_block_size;
+        while(i--) {
+            sorted_y& cur_y = m_sorted_y[cell_ptr->y - m_min_y];
+            m_sorted_cells[cur_y.start + cur_y.num] = cell_ptr;
+            ++cur_y.num;
+            ++cell_ptr;
+        }
+    }
+    i = m_num_cells & cell_block_mask;
+    if (i) {
+        cell_ptr = *block_ptr++;
+    }
+    while(i--) {
+        sorted_y& cur_y = m_sorted_y[cell_ptr->y - m_min_y];
+        m_sorted_cells[cur_y.start + cur_y.num] = cell_ptr;
+        ++cur_y.num;
+        ++cell_ptr;
+    }
+    for(i = 0; i < m_sorted_y.size(); i++) {
+        const sorted_y& cur_y = m_sorted_y[i];
+        if(cur_y.num) {
+            qsort_cells(m_sorted_cells.data() + cur_y.start, cur_y.num);
+        }
+    }
+    m_sorted = true;
+}
+}