Rack/src/widgets/SVGWidget.cpp

#include "widgets.hpp"


// #define DEBUG_ONLY(x) x
#define DEBUG_ONLY(x)

namespace rack {


static NVGcolor getNVGColor(uint32_t color) {
	return nvgRGBA(
		(color >> 0) & 0xff,
		(color >> 8) & 0xff,
		(color >> 16) & 0xff,
		(color >> 24) & 0xff);
}

static void drawSVG(NVGcontext *vg, NSVGimage *svg) {
	DEBUG_ONLY(printf("new image: %g x %g px\n", svg->width, svg->height);)
	int shapeIndex = 0;
	for (NSVGshape *shape = svg->shapes; shape; shape = shape->next, shapeIndex++) {
		DEBUG_ONLY(printf("	new shape: %d id \"%s\", fillrule %d, from (%f, %f) to (%f, %f)\n", shapeIndex, shape->id, shape->fillRule, shape->bounds[0], shape->bounds[1], shape->bounds[2], shape->bounds[3]);)

		if (!(shape->flags & NSVG_FLAGS_VISIBLE))
			continue;

		nvgSave(vg);

		if (shape->opacity < 1.0)
			nvgGlobalAlpha(vg, shape->opacity);

		// Build path
		nvgBeginPath(vg);
		for (NSVGpath *path = shape->paths; path; path = path->next) {
			DEBUG_ONLY(printf("		new path: %d points, %s, from (%f, %f) to (%f, %f)\n", path->npts, path->closed ? "closed" : "open", path->bounds[0], path->bounds[1], path->bounds[2], path->bounds[3]);)

			nvgMoveTo(vg, path->pts[0], path->pts[1]);
			for (int i = 1; i < path->npts; i += 3) {
				float *p = &path->pts[2*i];
				nvgBezierTo(vg, p[0], p[1], p[2], p[3], p[4], p[5]);
				// nvgLineTo(vg, p[4], p[5]);
			}

			if (path->closed)
				nvgClosePath(vg);

			// if ()
				// nvgPathWinding(vg, NVG_SOLID);
			// else
			// 	nvgPathWinding(vg, NVG_HOLE);
		}

		// Fill shape
		if (shape->fill.type) {
			switch (shape->fill.type) {
				case NSVG_PAINT_COLOR: {
					NVGcolor color = getNVGColor(shape->fill.color);
					nvgFillColor(vg, color);
					DEBUG_ONLY(printf("		fill color (%g, %g, %g, %g)\n", color.r, color.g, color.b, color.a);)
				} break;
				case NSVG_PAINT_LINEAR_GRADIENT: {
					NSVGgradient *g = shape->fill.gradient;
					DEBUG_ONLY(printf("		linear gradient: %f\t%f\n", g->fx, g->fy);)
				} break;
				case NSVG_PAINT_RADIAL_GRADIENT: {
					NSVGgradient *g = shape->fill.gradient;
					DEBUG_ONLY(printf("		radial gradient: %f\t%f\t%f\t%f\t%f\t%f\t%f\t%f\n", g->fx, g->fy, g->xform[0], g->xform[1], g->xform[2], g->xform[3], g->xform[4], g->xform[5]);)
					for (int i = 0; i < g->nstops; i++) {
						DEBUG_ONLY(printf("			stop: #%08x\t%f\n", g->stops[i].color, g->stops[i].offset);)
					}
					assert(g->nstops >= 1);
					NVGcolor color0 = getNVGColor(g->stops[0].color);
					NVGcolor color1 = getNVGColor(g->stops[g->nstops - 1].color);

					float inverse[6];
					Rect shapeBox = Rect::fromMinMax(Vec(shape->bounds[0], shape->bounds[1]), Vec(shape->bounds[2], shape->bounds[3]));
					nvgTransformInverse(inverse, g->xform);
					Vec c;
					nvgTransformPoint(&c.x, &c.y, inverse, 5, 5);
					printf("%f %f\n", c.x, c.y);

					NVGpaint paint = nvgRadialGradient(vg, c.x, c.y, 0.0, 160, color0, color1);
					nvgFillPaint(vg, paint);
				} break;
			}
			nvgFill(vg);
		}

		// Stroke shape
		nvgStrokeWidth(vg, shape->strokeWidth);
		// strokeDashOffset, strokeDashArray, strokeDashCount not yet supported
		// strokeLineJoin, strokeLineCap not yet supported

		if (shape->stroke.type) {
			switch (shape->stroke.type) {
				case NSVG_PAINT_COLOR: {
					NVGcolor color = getNVGColor(shape->stroke.color);
					nvgStrokeColor(vg, color);
					DEBUG_ONLY(printf("		stroke color (%g, %g, %g, %g)\n", color.r, color.g, color.b, color.a);)
				} break;
				case NSVG_PAINT_LINEAR_GRADIENT: {
					// NSVGgradient *g = shape->stroke.gradient;
					// printf("		lin grad: %f\t%f\n", g->fx, g->fy);
				} break;
			}
			nvgStroke(vg);
		}

		nvgRestore(vg);
	}

	DEBUG_ONLY(printf("\n");)
}


void SVGWidget::wrap() {
	if (svg && svg->handle) {
		box.size = Vec(svg->handle->width, svg->handle->height);
	}
	else {
		box.size = Vec();
	}
}

void SVGWidget::draw(NVGcontext *vg) {
	if (svg && svg->handle) {
		drawSVG(vg, svg->handle);
	}
}


} // namespace rack