C++ (Cpp) raster_rgba_hline_blend Examples

Example #1

File: raster_rgba.cpp Project: IrinaRogozhkina/drawproc

inline void fill2EllipseLines(pb_rgba *pb, const uint32_t cx, const uint32_t cy, const unsigned int x, const unsigned int y, const uint32_t color)
{
	int x1 = cx - x;
	int y1 = cy+y;
	int x2 = cx + x;
	int y2 = cy+y;

	if (clipLine(pb->frame, x1, y1, x2, y2)) {
		raster_rgba_hline_blend(pb, x1, y1, x2-x1, color);
	}
	
	y1 = cy - y;
	y2 = cy - y;
	if (clipLine(pb->frame, x1, y1, x2, y2)) {
		raster_rgba_hline_blend(pb, x1, y1, x2 - x1, color);
	}

	//raster_rgba_hline_blend(pb, cx - x, cy - y, 2 * x, color);
}

Example #2

File: raster_rgba_polygon.cpp Project: Wiladams/graphicc

void raster_rgba_convex_polygon_fill(pb_rgba *pb, coord *verts, const int nverts, const pb_rect &clipRect, int color)
{
	// find topmost vertex of the polygon
	int vmin = findTopmostVertex(verts, nverts);

	// set starting line
	APolyDda ldda, rdda;
	int y = int(verts[vmin*2+1]);
	ldda.yend = rdda.yend = y;

	// setup polygon scanner for left side, starting from top
	ldda.setupPolyDda(verts, nverts, vmin, +1);

	// setup polygon scanner for right side, starting from top
	rdda.setupPolyDda(verts, nverts, vmin, -1);

	//setColor(poly.colorNative);

	while (true)
	{
		if (y >= ldda.yend)
		{
			if (y >= rdda.yend)
			{
				if (ldda.vertNext == rdda.vertNext)	{ // if same vertex, then done
					break;
				}

				int vnext = rdda.vertNext - 1;

				if (vnext < 0) {
					vnext = nverts - 1;
				}

				if (vnext == ldda.vertNext)
				{
					break;
				}
			}
			ldda.setupPolyDda(verts, nverts, ldda.vertNext, +1);	// reset left side
		}

		// check for right dda hitting end of polygon side
		// if so, reset scanner
		if (y >= rdda.yend) {
			rdda.setupPolyDda(verts, nverts, rdda.vertNext, -1);
		}

		// fill span between two line-drawers, advance drawers when
		// hit vertices
		if (y >= clipRect.y) {
			raster_rgba_hline_blend(pb, round(ldda.x), y, round(rdda.x) - round(ldda.x), color);
		}

		ldda.x += ldda.dx;
		rdda.x += rdda.dx;

		// Advance y position.  Exit if run off its bottom
		y += 1;
		if (y >= clipRect.y + clipRect.height)
		{
			break;
		}
	}
}