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#include <math.h>
#include "evas_engine.h"
/* reduce calls to DirectFB (FillSpans), but uses twice as much memory */
//#define USE_SPAN_RECTS 1
#define MAX_SPANS 512
typedef struct _RGBA_Edge RGBA_Edge;
typedef struct _RGBA_Vertex RGBA_Vertex;
struct _RGBA_Edge
{
double x, dx;
int i;
};
struct _RGBA_Vertex
{
double 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;
}
#ifndef USE_SPAN_RECTS
typedef DFBSpan span_t;
static void
polygon_span_add(span_t *span, int y __UNUSED__, int x, int w)
{
span->x = x;
span->w = w;
}
static void
polygon_spans_fill(IDirectFBSurface *surface, int y, const span_t *spans, int n_spans)
{
/* directfb automatically increments y for each span */
for (; n_spans > 0; n_spans--, spans++)
surface->FillSpans(surface, y, spans, 1);
}
#else /* USE_SPAN_RECTS */
typedef DFBRectangle span_t;
static void
polygon_span_add(span_t *span, int y, int x, int w)
{
span->x = x;
span->y = y;
span->w = w;
span->h = 1;
}
static void
polygon_spans_fill(IDirectFBSurface *surface, int y, const span_t *spans, int n_spans)
{
surface->FillRectangles(surface, spans, n_spans);
}
#endif /* USE_SPAN_RECTS */
void
_dfb_polygon_draw(IDirectFBSurface *surface, RGBA_Draw_Context *dc, Eina_Inlist *points, int px, int py)
{
RGBA_Polygon_Point *pt;
RGBA_Vertex *point;
RGBA_Edge *edges;
int num_active_edges;
int n;
int i, j, k;
int y0, y1, y;
int ext_x, ext_y, ext_w, ext_h;
int *sorted_index;
ext_x = 0;
ext_y = 0;
surface->GetSize(surface, &ext_w, &ext_h);
if (dc->clip.use)
{
if (dc->clip.x > ext_x)
{
ext_w += ext_x - dc->clip.x;
ext_x = dc->clip.x;
}
if ((ext_x + ext_w) > (dc->clip.x + dc->clip.w))
{
ext_w = (dc->clip.x + dc->clip.w) - ext_x;
}
if (dc->clip.y > ext_y)
{
ext_h += ext_y - dc->clip.y;
ext_y = dc->clip.y;
}
if ((ext_y + ext_h) > (dc->clip.y + dc->clip.h))
{
ext_h = (dc->clip.y + dc->clip.h) - ext_y;
}
}
if ((ext_w <= 0) || (ext_h <= 0)) return;
evas_common_cpu_end_opt();
if (!_dfb_surface_set_color_from_context(surface, dc))
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 + px;
point[k].y = pt->y + py;
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 + px;
point[k].y = pt->y + py;
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 (y = y0; y <= y1; y++)
{
span_t spans[MAX_SPANS];
unsigned int n_spans = 0;
for (; (k < n) && (point[sorted_index[k]].y <= ((double)y + 0.5)); k++)
{
i = sorted_index[k];
if (i > 0) j = i - 1;
else j = n - 1;
if (point[j].y <= ((double)y - 0.5))
{
POLY_EDGE_DEL(j)
}
else if (point[j].y > ((double)y + 0.5))
{
POLY_EDGE_ADD(j, y)
}
if (i < (n - 1)) j = i + 1;
else j = 0;
if (point[j].y <= ((double)y - 0.5))
{
POLY_EDGE_DEL(i)
}
else if (point[j].y > ((double)y + 0.5))
{
POLY_EDGE_ADD(i, y)
}
}
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))
{
if (n_spans == MAX_SPANS)
{
polygon_spans_fill(surface, y, spans, n_spans);
n_spans = 0;
}
polygon_span_add(spans + n_spans, y, x0, (x1 - x0) + 1);
n_spans++;
}
edges[j].x += edges[j].dx;
edges[j + 1].x += edges[j + 1].dx;
}
if (n_spans)
polygon_spans_fill(surface, y, spans, n_spans);
}
free(edges);
free(point);
free(sorted_index);
}
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