1 files changed, 231 insertions, 0 deletions

diff --git a/libraries/evas/src/lib/engines/common_16/evas_soft16_polygon.c b/libraries/evas/src/lib/engines/common_16/evas_soft16_polygon.c
new file mode 100644
index 0000000..ca18bef
--- /dev/null
+++ b/libraries/evas/src/lib/engines/common_16/evas_soft16_polygon.c
@@ -0,0 +1,231 @@
+#include <math.h>
+#include <evas_common_soft16.h>
+#include "evas_soft16_scanline_fill.c"
+
+typedef struct _RGBA_Edge RGBA_Edge;
+typedef struct _RGBA_Vertex RGBA_Vertex;
+
+struct _RGBA_Edge
+{
+   float x, dx;
+   int i;
+};
+
+struct _RGBA_Vertex
+{
+   float x, y;
+   int i;
+};
+
+#define POLY_EDGE_DEL(_i)                                               \
+{                                                                       \
+   int _j;                                                              \
+                                                                        \
+   for (_j = 0; (_j < num_active_edges) && (edges[_j].i != _i); _j++);  \
+   if (_j < num_active_edges)                                           \
+     {                                                                  \
+        num_active_edges--;                                             \
+        memmove(&(edges[_j]), &(edges[_j + 1]),                         \
+                (num_active_edges - _j) * sizeof(RGBA_Edge));           \
+     }                                                                  \
+}
+
+#define POLY_EDGE_ADD(_i, _y)                                           \
+{                                                                       \
+   int _j;                                                              \
+   float _dx;                                                           \
+   RGBA_Vertex *_p, *_q;                                                \
+   if (_i < (n - 1)) _j = _i + 1;                                       \
+   else _j = 0;                                                         \
+   if (point[_i].y < point[_j].y)                                       \
+     {                                                                  \
+        _p = &(point[_i]);                                              \
+        _q = &(point[_j]);                                              \
+     }                                                                  \
+   else                                                                 \
+     {                                                                  \
+        _p = &(point[_j]);                                              \
+        _q = &(point[_i]);                                              \
+     }                                                                  \
+   edges[num_active_edges].dx = _dx = (_q->x - _p->x) / (_q->y - _p->y); \
+   edges[num_active_edges].x = (_dx * ((float)_y + 0.5 - _p->y)) + _p->x; \
+   edges[num_active_edges].i = _i;                                      \
+   num_active_edges++;                                                  \
+}
+
+static int
+polygon_point_sorter(const void *a, const void *b)
+{
+   RGBA_Vertex *p, *q;
+
+   p = (RGBA_Vertex *)a;
+   q = (RGBA_Vertex *)b;
+   if (p->y <= q->y) return -1;
+   return 1;
+}
+
+static int
+polygon_edge_sorter(const void *a, const void *b)
+{
+   RGBA_Edge *p, *q;
+
+   p = (RGBA_Edge *)a;
+   q = (RGBA_Edge *)b;
+   if (p->x <= q->x) return -1;
+   return 1;
+}
+
+void
+evas_common_soft16_polygon_draw(Soft16_Image *dst, RGBA_Draw_Context *dc, RGBA_Polygon_Point *points, int x, int y)
+{
+   RGBA_Polygon_Point *pt;
+   RGBA_Vertex       *point;
+   RGBA_Edge         *edges;
+   int                num_active_edges;
+   int                n;
+   int                i, j, k;
+   int                y0, y1, yi;
+   int                ext_x, ext_y, ext_w, ext_h;
+   int               *sorted_index;
+   DATA8 alpha;
+   DATA16 rgb565;
+   DATA32 rgb565_unpack;
+
+   alpha = A_VAL(&dc->col.col) >> 3;
+   if (alpha == 0)
+     return;
+   alpha++;
+
+   rgb565 = RGB_565_FROM_COMPONENTS(R_VAL(&dc->col.col),
+                                    G_VAL(&dc->col.col),
+                                    B_VAL(&dc->col.col));
+   rgb565_unpack = RGB_565_UNPACK(rgb565);
+
+   ext_x = 0;
+   ext_y = 0;
+   ext_w = dst->cache_entry.w;
+   ext_h = dst->cache_entry.h;
+   if (dc->clip.use)
+     RECTS_CLIP_TO_RECT(ext_x, ext_y, ext_w, ext_h,
+                        dc->clip.x, dc->clip.y, dc->clip.w, dc->clip.h);
+
+   if ((ext_w <= 0) || (ext_h <= 0))
+     return;
+
+   n = 0;
+   EINA_INLIST_FOREACH(points, pt) n++;
+
+   if (n < 3)
+     return;
+
+   edges = malloc(sizeof(RGBA_Edge) * n);
+   if (!edges)
+     return;
+
+   point = malloc(sizeof(RGBA_Vertex) * n);
+   if (!point)
+     {
+        free(edges);
+        return;
+     }
+
+   sorted_index = malloc(sizeof(int) * n);
+   if (!sorted_index)
+     {
+        free(edges);
+        free(point);
+        return;
+     }
+
+   k = 0;
+   EINA_INLIST_FOREACH(points, pt)
+     {
+        point[k].x = pt->x + x;
+        point[k].y = pt->y + y;
+        point[k].i = k;
+        k++;
+     }
+   qsort(point, n, sizeof(RGBA_Vertex), polygon_point_sorter);
+
+   for (k = 0; k < n; k++)
+     sorted_index[k] = point[k].i;
+
+   k = 0;
+   EINA_INLIST_FOREACH(points, pt)
+     {
+        point[k].x = pt->x + x;
+        point[k].y = pt->y + y;
+        point[k].i = k;
+        k++;
+     }
+
+   y0 = MAX(ext_y, ceil(point[sorted_index[0]].y - 0.5));
+   y1 = MIN(ext_y + ext_h - 1, floor(point[sorted_index[n - 1]].y - 0.5));
+
+   k = 0;
+   num_active_edges = 0;
+
+   for (yi = y0; yi <= y1; yi++)
+     {
+        for (; (k < n) && (point[sorted_index[k]].y <= ((float)yi + 0.5)); k++)
+          {
+             i = sorted_index[k];
+
+             if (i > 0) j = i - 1;
+             else j = n - 1;
+             if (point[j].y <= ((float)yi - 0.5))
+               {
+                  POLY_EDGE_DEL(j)
+               }
+             else if (point[j].y > ((float)yi + 0.5))
+               {
+                  POLY_EDGE_ADD(j, yi)
+               }
+             if (i < (n - 1)) j = i + 1;
+             else j = 0;
+             if (point[j].y <= ((float)yi - 0.5))
+               {
+                  POLY_EDGE_DEL(i)
+               }
+             else if (point[j].y > ((float)yi + 0.5))
+               {
+                  POLY_EDGE_ADD(i, yi)
+               }
+          }
+
+        qsort(edges, num_active_edges, sizeof(RGBA_Edge), polygon_edge_sorter);
+
+        for (j = 0; j < num_active_edges; j += 2)
+          {
+             int x0, x1;
+
+             x0 = ceil(edges[j].x - 0.5);
+             if (j < (num_active_edges - 1))
+               x1 = floor(edges[j + 1].x - 0.5);
+             else
+               x1 = x0;
+             if ((x1 >= ext_x) && (x0 < (ext_x + ext_w)) && (x0 <= x1))
+               {
+                  DATA16 *dst_itr;
+                  int w;
+
+                  if (x0 < ext_x) x0 = ext_x;
+                  if (x1 >= (ext_x + ext_w)) x1 = ext_x + ext_w - 1;
+
+                  w = (x1 - x0) + 1;
+                  dst_itr = dst->pixels + (yi * dst->stride) + x0;
+
+                  if (alpha == 32)
+                    _soft16_scanline_fill_solid_solid(dst_itr, w, rgb565);
+                  else
+                    _soft16_scanline_fill_transp_solid(dst_itr, w, rgb565_unpack, alpha);
+               }
+             edges[j].x += edges[j].dx;
+             edges[j + 1].x += edges[j + 1].dx;
+          }
+     }
+
+   free(edges);
+   free(point);
+   free(sorted_index);
+}