add pixman and libpngraylib

1 files changed, 182 insertions, 0 deletions

diff --git a/libs/pixman-0.40.0/pixman/pixman-edge-imp.h b/libs/pixman-0.40.0/pixman/pixman-edge-imp.h
new file mode 100644
index 0000000..a4698ed
--- /dev/null
+++ b/libs/pixman-0.40.0/pixman/pixman-edge-imp.h
@@ -0,0 +1,182 @@
+/*
+ * Copyright © 2004 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Keith Packard makes no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef rasterize_span
+#endif
+
+static void
+RASTERIZE_EDGES (pixman_image_t  *image,
+		pixman_edge_t	*l,
+		pixman_edge_t	*r,
+		pixman_fixed_t		t,
+		pixman_fixed_t		b)
+{
+    pixman_fixed_t  y = t;
+    uint32_t  *line;
+    uint32_t *buf = (image)->bits.bits;
+    int stride = (image)->bits.rowstride;
+    int width = (image)->bits.width;
+
+    line = buf + pixman_fixed_to_int (y) * stride;
+
+    for (;;)
+    {
+	pixman_fixed_t	lx;
+	pixman_fixed_t      rx;
+	int	lxi;
+	int rxi;
+
+	lx = l->x;
+	rx = r->x;
+#if N_BITS == 1
+	/* For the non-antialiased case, round the coordinates up, in effect
+	 * sampling just slightly to the left of the pixel. This is so that
+	 * when the sample point lies exactly on the line, we round towards
+	 * north-west.
+	 *
+	 * (The AA case does a similar  adjustment in RENDER_SAMPLES_X)
+	 */
+	lx += X_FRAC_FIRST(1) - pixman_fixed_e;
+	rx += X_FRAC_FIRST(1) - pixman_fixed_e;
+#endif
+	/* clip X */
+	if (lx < 0)
+	    lx = 0;
+	if (pixman_fixed_to_int (rx) >= width)
+#if N_BITS == 1
+	    rx = pixman_int_to_fixed (width);
+#else
+	    /* Use the last pixel of the scanline, covered 100%.
+	     * We can't use the first pixel following the scanline,
+	     * because accessing it could result in a buffer overrun.
+	     */
+	    rx = pixman_int_to_fixed (width) - 1;
+#endif
+
+	/* Skip empty (or backwards) sections */
+	if (rx > lx)
+	{
+
+	    /* Find pixel bounds for span */
+	    lxi = pixman_fixed_to_int (lx);
+	    rxi = pixman_fixed_to_int (rx);
+
+#if N_BITS == 1
+	    {
+
+#define LEFT_MASK(x)							\
+		(((x) & 0x1f) ?						\
+		 SCREEN_SHIFT_RIGHT (0xffffffff, (x) & 0x1f) : 0)
+#define RIGHT_MASK(x)							\
+		(((32 - (x)) & 0x1f) ?					\
+		 SCREEN_SHIFT_LEFT (0xffffffff, (32 - (x)) & 0x1f) : 0)
+		
+#define MASK_BITS(x,w,l,n,r) {						\
+		    n = (w);						\
+		    r = RIGHT_MASK ((x) + n);				\
+		    l = LEFT_MASK (x);					\
+		    if (l) {						\
+			n -= 32 - ((x) & 0x1f);				\
+			if (n < 0) {					\
+			    n = 0;					\
+			    l &= r;					\
+			    r = 0;					\
+			}						\
+		    }							\
+		    n >>= 5;						\
+		}
+		
+		uint32_t  *a = line;
+		uint32_t  startmask;
+		uint32_t  endmask;
+		int	    nmiddle;
+		int	    width = rxi - lxi;
+		int	    x = lxi;
+		
+		a += x >> 5;
+		x &= 0x1f;
+		
+		MASK_BITS (x, width, startmask, nmiddle, endmask);
+
+		if (startmask) {
+		    WRITE(image, a, READ(image, a) | startmask);
+		    a++;
+		}
+		while (nmiddle--)
+		    WRITE(image, a++, 0xffffffff);
+		if (endmask)
+		    WRITE(image, a, READ(image, a) | endmask);
+	    }
+#else
+	    {
+		DEFINE_ALPHA(line,lxi);
+		int	    lxs;
+		int     rxs;
+
+		/* Sample coverage for edge pixels */
+		lxs = RENDER_SAMPLES_X (lx, N_BITS);
+		rxs = RENDER_SAMPLES_X (rx, N_BITS);
+
+		/* Add coverage across row */
+		if (lxi == rxi)
+		{
+		    ADD_ALPHA (rxs - lxs);
+		}
+		else
+		{
+		    int	xi;
+
+		    ADD_ALPHA (N_X_FRAC(N_BITS) - lxs);
+		    STEP_ALPHA;
+		    for (xi = lxi + 1; xi < rxi; xi++)
+		    {
+			ADD_ALPHA (N_X_FRAC(N_BITS));
+			STEP_ALPHA;
+		    }
+		    ADD_ALPHA (rxs);
+		}
+	    }
+#endif
+	}
+
+	if (y == b)
+	    break;
+
+#if N_BITS > 1
+	if (pixman_fixed_frac (y) != Y_FRAC_LAST(N_BITS))
+	{
+	    RENDER_EDGE_STEP_SMALL (l);
+	    RENDER_EDGE_STEP_SMALL (r);
+	    y += STEP_Y_SMALL(N_BITS);
+	}
+	else
+#endif
+	{
+	    RENDER_EDGE_STEP_BIG (l);
+	    RENDER_EDGE_STEP_BIG (r);
+	    y += STEP_Y_BIG(N_BITS);
+	    line += stride;
+	}
+    }
+}
+
+#undef rasterize_span