From 179fa413b047bede6e32109e2ce82437c5fb8d34 Mon Sep 17 00:00:00 2001
From: MenTaLguY <mental@rydia.net>
Date: Mon, 16 Jan 2006 02:36:01 +0000
Subject: moving trunk for module inkscape

(bzr r1)
---
 src/libnr/nr-pixblock-pattern.cpp | 126 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/libnr/nr-pixblock-pattern.cpp

(limited to 'src/libnr/nr-pixblock-pattern.cpp')

diff --git a/src/libnr/nr-pixblock-pattern.cpp b/src/libnr/nr-pixblock-pattern.cpp
new file mode 100644
index 000000000..03bd688ba
--- /dev/null
+++ b/src/libnr/nr-pixblock-pattern.cpp
@@ -0,0 +1,126 @@
+#define __NR_PIXBLOCK_PATTERN_C__
+
+/*
+ * Pixel buffer rendering library
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *
+ * This code is in public domain
+ */
+
+
+#include "nr-pixops.h"
+#include "nr-pixblock-pattern.h"
+
+#define NR_NOISE_SIZE 1024
+
+void
+nr_pixblock_render_gray_noise (NRPixBlock *pb, NRPixBlock *mask)
+{
+	static unsigned char *noise = NULL;
+	static unsigned int seed = 0;
+	unsigned int v;
+	NRRectL clip;
+	int x, y, bpp;
+
+	if (mask) {
+		if (mask->empty) return;
+		nr_rect_l_intersect (&clip, &pb->area, &mask->area);
+		if (nr_rect_l_test_empty (&clip)) return;
+	} else {
+		clip = pb->area;
+	}
+
+	if (!noise) {
+		int i;
+		noise = nr_new (unsigned char, NR_NOISE_SIZE);
+		for (i = 0; i < NR_NOISE_SIZE; i++) noise[i] = (rand () / (RAND_MAX >> 8)) & 0xff;
+	}
+
+	bpp = NR_PIXBLOCK_BPP (pb);
+
+	v = (rand () / (RAND_MAX >> 8)) & 0xff;
+
+	if (mask) {
+		for (y = clip.y0; y < clip.y1; y++) {
+			unsigned char *d, *m;
+			d = NR_PIXBLOCK_PX (pb) + (y - pb->area.y0) * pb->rs + (clip.x0 - pb->area.x0) * bpp;
+			m = NR_PIXBLOCK_PX (mask) + (y - mask->area.y0) * pb->rs + (clip.x0 - mask->area.x0);
+			for (x = clip.x0; x < clip.x1; x++) {
+				v = v ^ noise[seed];
+				switch (pb->mode) {
+				case NR_PIXBLOCK_MODE_A8:
+					d[0] = (65025 - (255 - m[0]) * (255 - d[0]) + 127) / 255;
+					break;
+				case NR_PIXBLOCK_MODE_R8G8B8:
+					d[0] = NR_COMPOSEN11 (v, m[0], d[0]);
+					d[1] = NR_COMPOSEN11 (v, m[0], d[1]);
+					d[2] = NR_COMPOSEN11 (v, m[0], d[2]);
+					break;
+				case NR_PIXBLOCK_MODE_R8G8B8A8N:
+					if (m[0] != 0) {
+						unsigned int ca;
+						ca = NR_A7 (m[0], d[3]);
+						d[0] = NR_COMPOSENNN_A7 (v, m[0], d[0], d[3], ca);
+						d[1] = NR_COMPOSENNN_A7 (v, m[0], d[1], d[3], ca);
+						d[2] = NR_COMPOSENNN_A7 (v, m[0], d[2], d[3], ca);
+						d[3] = (ca + 127) / 255;
+					}
+					break;
+				case NR_PIXBLOCK_MODE_R8G8B8A8P:
+					d[0] = NR_COMPOSENPP (v, m[0], d[0], d[3]);
+					d[1] = NR_COMPOSENPP (v, m[0], d[1], d[3]);
+					d[2] = NR_COMPOSENPP (v, m[0], d[2], d[3]);
+					d[3] = (NR_A7 (d[3], m[0]) + 127) / 255;
+					break;
+				default:
+					break;
+				}
+				d += bpp;
+				m += 1;
+				if (++seed >= NR_NOISE_SIZE) {
+					int i;
+					i = (rand () / (RAND_MAX / NR_NOISE_SIZE)) % NR_NOISE_SIZE;
+					noise[i] ^= v;
+					seed = i % (NR_NOISE_SIZE >> 2);
+				}
+			}
+		}
+	} else {
+		for (y = clip.y0; y < clip.y1; y++) {
+			unsigned char *d;
+			d = NR_PIXBLOCK_PX (pb) + (y - pb->area.y0) * pb->rs + (clip.x0 - pb->area.x0) * bpp;
+			for (x = clip.x0; x < clip.x1; x++) {
+				v = v ^ noise[seed];
+				switch (pb->mode) {
+				case NR_PIXBLOCK_MODE_A8:
+					d[0] = 255;
+					break;
+				case NR_PIXBLOCK_MODE_R8G8B8:
+					d[0] = v;
+					d[1] = v;
+					d[2] = v;
+					break;
+				case NR_PIXBLOCK_MODE_R8G8B8A8N:
+				case NR_PIXBLOCK_MODE_R8G8B8A8P:
+					d[0] = v;
+					d[1] = v;
+					d[2] = v;
+					d[3] = 255;
+				default:
+					break;
+				}
+				d += bpp;
+				if (++seed >= NR_NOISE_SIZE) {
+					int i;
+					i = (rand () / (RAND_MAX / NR_NOISE_SIZE)) % NR_NOISE_SIZE;
+					noise[i] ^= v;
+					seed = i % (NR_NOISE_SIZE >> 2);
+				}
+			}
+		}
+	}
+
+	pb->empty = 0;
+}
-- 
cgit v1.2.3