* evas: don't segv when manipulating line at canvas border.

	FIXME: When the jump code start, it break line continuity and
	make them look hugly. I have no idea how to properly fix that
	right now.

git-svn-id: http://svn.enlightenment.org/svn/e/trunk/evas@54330 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

diff --git a/src/lib/engines/common/evas_line_main.c b/src/lib/engines/common/evas_line_main.c
index 5cae324..7e37d7b 100644 (file)
--- a/src/lib/engines/common/evas_line_main.c
+++ b/src/lib/engines/common/evas_line_main.c
@@ -16,23 +16,23 @@ _evas_draw_line_aa(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x
 
 
 #define IN_RANGE(x, y, w, h) \
-  ( ((unsigned)(x) < (unsigned)(w)) && ((unsigned)(y) < (unsigned)(h)) )
-
-#define IN_RECT(x, y, rx, ry, rw, rh)          \
-( ((unsigned)((x) - (rx)) < (unsigned)(rw)) && \
-  ((unsigned)((y) - (ry)) < (unsigned)(rh)) )
-
-#define EXCHANGE_POINTS(x0, y0, x1, y1) \
-{ \
-       int _tmp = y0; \
-  \
-       y0 = y1;   \
-       y1 = _tmp; \
-  \
-       _tmp = x0; \
-       x0 = x1;   \
-       x1 = _tmp; \
-}
+  ( x > 0 && y > 0 &&((unsigned)(x) < (unsigned)(w)) && ((unsigned)(y) < (unsigned)(h)) )
+
+#define IN_RECT(x, y, rx, ry, rw, rh)                   \
+  ( ((unsigned)((x) - (rx)) < (unsigned)(rw)) &&        \
+    ((unsigned)((y) - (ry)) < (unsigned)(rh)) )
+
+#define EXCHANGE_POINTS(x0, y0, x1, y1)         \
+  {                                             \
+     int _tmp = y0;                             \
+                                                \
+     y0 = y1;                                   \
+     y1 = _tmp;                                 \
+                                                \
+     _tmp = x0;                                 \
+     x0 = x1;                                   \
+     x1 = _tmp;                                 \
+  }
 
 
 EAPI void
@@ -502,6 +502,10 @@ _evas_draw_line(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x1,
                if ((py < 0) && (dely < 0)) return;
                if ((py > by) && (dely > 0)) return;
              }
+            if (!p0_in)
+              {
+                 if (py < 0) goto next_x;
+              }
 #ifdef EVAS_SLI
             if (((py) % dc->sli.h) == dc->sli.y)
 #endif
@@ -509,6 +513,7 @@ _evas_draw_line(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x1,
                  if (IN_RANGE(px, py, clw, clh))
                    pfunc(0, 255, color, p);
               }
+          next_x:
            yy += dyy;
            px++;
            p++;
@@ -535,6 +540,10 @@ _evas_draw_line(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x1,
            if ((px < 0) && (delx < 0)) return;
            if ((px > rx) && (delx > 0)) return;
          }
+        if (!p0_in)
+          {
+             if (px < 0) goto next_y;
+          }
 #ifdef EVAS_SLI
        if (((py) % dc->sli.h) == dc->sli.y)
 #endif
@@ -542,6 +551,7 @@ _evas_draw_line(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x1,
             if (IN_RANGE(px, py, clw, clh))
               pfunc(0, 255, color, p);
          }
+     next_y:
        xx += dxx;
        py++;
        p += dstw;
@@ -607,10 +617,14 @@ _evas_draw_line_aa(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x
              }
            if (!p1_in)
              {
-               if ((py <= -1) && (dely < 0)) return;
+               if ((py < 0) && (dely < 0)) return;
                if ((py > by) && (dely > 0)) return;
              }
-           if ((px) < clw)
+            if (!p0_in)
+              {
+                 if (py < 0) goto next_x;
+              }
+           if (px < clw)
              {
                aa = ((yy - (y << 16)) >> 8);
                if ((py) < clh)
@@ -618,6 +632,8 @@ _evas_draw_line_aa(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x
                if ((py + 1) < clh)
                   pfunc(0, aa, color, p + dstw);
              }
+
+          next_x:
            yy += dyy;
            px++;
            p++;
@@ -642,10 +658,14 @@ _evas_draw_line_aa(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x
          }
        if (!p1_in)
          {
-           if ((px <= -1) && (delx < 0)) return;
+           if ((px < 0) && (delx < 0)) return;
            if ((px > rx) && (delx > 0)) return;
          }
-       if ((py) < clh)
+        if (!p0_in)
+          {
+             if (px < 0) goto next_y;
+          }
+       if (py < clh)
          {
            aa = ((xx - (x << 16)) >> 8);
            if ((px) < clw)
@@ -653,6 +673,7 @@ _evas_draw_line_aa(RGBA_Image *dst, RGBA_Draw_Context *dc, int x0, int y0, int x
            if ((px + 1) < clw)
                pfunc(0, aa, color, p + 1);
          }
+     next_y:
        xx += dxx;
        py++;
        p += dstw;