moving trunk for module inkscape

(bzr r1)

1 files changed, 92 insertions, 0 deletions

diff --git a/src/libnr/nr-pixblock-line.cpp b/src/libnr/nr-pixblock-line.cpp
new file mode 100644
index 000000000..5e025c7eb
--- /dev/null
+++ b/src/libnr/nr-pixblock-line.cpp
@@ -0,0 +1,92 @@
+#define __NR_PIXBLOCK_LINE_C__
+
+/*
+ * Pixel buffer rendering library
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *
+ * This code is in public domain
+ */
+
+#include <libnr/nr-pixops.h>
+#include <libnr/nr-pixblock-pixel.h>
+
+void
+nr_pixblock_draw_line_rgba32 (NRPixBlock *d, long x0, long y0, long x1, long y1, short first, unsigned long rgba)
+{
+	long deltax, deltay, xinc1, xinc2, yinc1, yinc2;
+	long den, num, numadd, numpixels;
+	long x, y, curpixel;
+	/* Pixblock */
+	int dbpp;
+	NRPixBlock spb;
+	unsigned char *spx;
+
+	if (x1 >= x0) {
+		deltax = x1 - x0;
+		xinc1 = 1;
+		xinc2 = 1;
+	} else {
+		deltax = x0 - x1;
+		xinc1 = -1;
+		xinc2 = -1;
+	}
+
+	if (y1 >= y0) {
+		deltay = y1 - y0;
+		yinc1 = 1;
+		yinc2 = 1;
+	} else {
+		deltay = y0 - y1;
+		yinc1 = -1;
+		yinc2 = -1;
+	}
+
+	if (deltax >= deltay) {
+		xinc1 = 0;
+		yinc2 = 0;
+		den = deltax;
+		num = deltax / 2;
+		numadd = deltay;
+		numpixels = deltax;
+	} else {
+		xinc2 = 0;
+		yinc1 = 0;
+		den = deltay;
+		num = deltay / 2;
+		numadd = deltax;
+		numpixels = deltay;
+	}
+
+	/* We can be quite sure 1x1 pixblock is TINY */
+	nr_pixblock_setup_fast (&spb, NR_PIXBLOCK_MODE_R8G8B8A8N, 0, 0, 1, 1, 0);
+	spb.empty = 0;
+	spx = NR_PIXBLOCK_PX (&spb);
+	spx[0] = NR_RGBA32_R (rgba);
+	spx[1] = NR_RGBA32_G (rgba);
+	spx[2] = NR_RGBA32_B (rgba);
+	spx[3] = NR_RGBA32_A (rgba);
+
+	dbpp = NR_PIXBLOCK_BPP (d);
+
+	x = x0;
+	y = y0;
+
+	for (curpixel = 0; curpixel <= numpixels; curpixel++) {
+		if ((x >= d->area.x0) && (y >= d->area.y0) && (x < d->area.x1) && (y < d->area.y1)) {
+			nr_compose_pixblock_pixblock_pixel (d, NR_PIXBLOCK_PX (d) + (y - d->area.y0) * d->rs + (x - d->area.x0) * dbpp, &spb, spx);
+		}
+		num += numadd;
+		if (num >= den) {
+			num -= den;
+			x += xinc1;
+			y += yinc1;
+		}
+		x += xinc2;
+		y += yinc2;
+	}
+
+	nr_pixblock_release (&spb);
+}
+