--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dmline.c	Fri Sep 28 01:54:23 2012 +0300
@@ -0,0 +1,81 @@
+/*
+ * DMLib
+ * -- Arbitrary line drawing functions
+ * Programmed and designed by Matti 'ccr' Hamalainen
+ * (C) Copyright 2011 Tecnic Software productions (TNSP)
+ */
+#include "dmlib.h"
+
+
+/* Clip line coordinates. Return value:
+ * = 0  : No clipping needed.
+ * > 0  : Clipped. Line partially inside the clipping area.
+ * < 0  : Line completely outside the clipping area.
+ */
+int dmClipLineCoords(int *x0, int *y0, int *x1, int *y1, SDL_Surface *screen)
+{
+#if 0
+    const int clipX0 = screen->clip_rect.x,
+              clipY0 = screen->clip_rect.y;
+    const int clipX1 = clipX0 + screen->clip_rect.w - 1,
+              clipY1 = clipY0 + screen->clip_rect.h - 1;
+    const int dx = *x1 - *x0,
+              dy = *y1 - *y0;
+    DMFixedPoint k, kdx, kdy;
+
+    // Is line completely outside the clipping area?
+    if ((*x0 < clipX0 && *x1 < clipX0) || (*x0 > clipX1 && *x1 > clipX1) ||
+        (*y0 < clipY0 && *y1 < clipY0) || (*y0 > clipY1 && *y1 > clipY1))
+        return -1;
+    
+    FP_SETHL(kdx, dx);
+    FP_SETHL(kdy, dy);
+#endif        
+    
+    return 0;
+}
+
+
+int dmTestLineCoords(int x0, int y0, int x1, int y1, SDL_Surface *screen)
+{
+    return dmClipLineCoords(&x0, &y0, &x1, &y1, screen);
+}
+
+
+#include "dmlinefunc.h"
+
+static const DMDrawLineFunc dmDrawLineTable[DMD_NMODES][DMD_NBITDEPTHS] =
+{
+    /* DMD_NONE          */ { dmDrawLine8              , dmDrawLine32 },
+    /* DMD_TRANSPARENT   */ { dmDrawLine8Transparent   , dmDrawLine32Transparent },
+    /* DMD_SATURATE      */ { dmDrawLine8Saturate      , dmDrawLine32Saturate },
+    /* DMD_NONE + AA     */ { NULL, NULL },
+    /* DMD_TRANSP + AA   */ { NULL, NULL },
+    /* DMD_SATURATE + AA */ { dmDrawLine8AASaturate    , dmDrawLine32AASaturate },
+};
+
+
+DMDrawLineFunc dmGetDrawLineFunc(SDL_PixelFormat *dst, int mode)
+{
+    int index;
+    if (dst == NULL || mode < 0 ||
+        mode >= sizeof(dmDrawLineTable) / sizeof(dmDrawLineTable[0]))
+        return NULL;
+
+    if ((index = dmBitsPerPixel2Index(src->BitsPerPixel)) < 0)
+        return NULL;
+    
+    return dmDrawLineTable[mode]
+}
+
+
+int dmDrawLineAny(SDL_Surface *screen, int x0, int y0, int x1, int y1, const Uint32 col, int mode)
+{
+    DMDrawLineFunc bfunc = dmGetDrawLineFunc(screen->format, mode);
+
+    if (bfunc == NULL)
+        return -15;
+
+    return bfunc(screen, x0, y0, x1, y1, col);
+}
+