public void RCTUIGraphicsBeginImageContext(CGSize size, Color backgroundColor, bool hasCornerRadii, bool drawToEdge) { /// create cairo surface and context here surface = Cairo.cairo_image_surface_create(0, 1920, 1080); cairo = Cairo.cairo_create(surface); /* clear background as white */ Cairo.cairo_set_source_rgba(cairo, 1, 1, 1, 1); Cairo.cairo_paint(cairo); // set default stroke line width and color for Cairo context Cairo.cairo_set_line_width(cairo, 1.0); Cairo.cairo_set_source_rgba(cairo, 0, 0, 0, 1); //black line }
void RCTGetSolidBorderImage(RCTCornerRadii cornerRadii, CGSize viewSize, UIEdgeInsets borderInsets, RCTBorderColors borderColors, //uint backgroundColor, Color backgroundColor, bool drawToEdge) { bool hasCornerRadii = RCTCornerRadiiAreAboveThreshold(cornerRadii); RCTCornerInsets cornerInsets = RCTGetCornerInsets(cornerRadii, borderInsets); Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::RCTGetSolidBorderImage BGN "); Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , hasCornerRadii:" + hasCornerRadii); bool makeStretchable = (borderInsets.left + cornerInsets.topLeft.width + borderInsets.right + cornerInsets.bottomRight.width <= viewSize.width) && (borderInsets.left + cornerInsets.bottomLeft.width + borderInsets.right + cornerInsets.topRight.width <= viewSize.width) && (borderInsets.top + cornerInsets.topLeft.height + borderInsets.bottom + cornerInsets.bottomRight.height <= viewSize.height) && (borderInsets.top + cornerInsets.topRight.height + borderInsets.bottom + cornerInsets.bottomLeft.height <= viewSize.height); UIEdgeInsets edgeInsets = new UIEdgeInsets ( borderInsets.top + Math.Max(cornerInsets.topLeft.height, cornerInsets.topRight.height), borderInsets.left + Math.Max(cornerInsets.topLeft.width, cornerInsets.bottomLeft.width), borderInsets.bottom + Math.Max(cornerInsets.bottomLeft.height, cornerInsets.bottomRight.height), borderInsets.right + Math.Max(cornerInsets.bottomRight.width, cornerInsets.topRight.width) ); makeStretchable = false; Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , makeStretchable:" + makeStretchable); CGSize sizeStretch = new CGSize ( // 1pt for the middle stretchable area along each axis edgeInsets.left + 1 + edgeInsets.right, edgeInsets.top + 1 + edgeInsets.bottom ); //CGSize size = makeStretchable ? sizeStretch: viewSize; CGSize size = viewSize; // begin libCairo engine drawing context RCTUIGraphicsBeginImageContext(size, backgroundColor, hasCornerRadii, drawToEdge); CGRect rect = new CGRect((new CGPoint(0, 0)), size); RCTPathCreateOuterOutline(drawToEdge, rect, cornerRadii); Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , backgroundColor.IsDefault:" + backgroundColor.IsDefault); if (!backgroundColor.IsDefault) { // paint the background color here Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::Fill the background Color! "); RCTContextSetFillColorWithColor(cairo, backgroundColor); //RCTContextSetFillColorWithUint(cairo, backgroundColor); Cairo.cairo_fill(cairo); } // for Cairo instead, draw rounded Rectangle path here Cairo.cairo_append_path(cairo, pathOuter); pathInner = RCTPathCreateWithRoundedRect(UIEdgeInsetsInsetRect(rect, borderInsets), cornerInsets); //Cairo.cairo_append_path(cairo, pathInner); /// Clip the outerpath with inner path by eod rule.. Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_EVEN_ODD); //Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_WINDING); Cairo.cairo_clip(cairo); RCTContextSetFillColorWithUint(cairo, borderColors.left); Cairo.cairo_paint(cairo); bool hasEqualColors = RCTBorderColorsAreEqual(borderColors); Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] drawToEdge:" + drawToEdge + ", hasCornerRadii:" + hasCornerRadii + ", hasEqualColors:" + hasEqualColors); if ((drawToEdge || !hasCornerRadii) && hasEqualColors) { Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] rect.origin.x:" + rect.origin.x + ", rect.origin.y:" + rect.origin.y + ", rect.size.width:" + rect.size.width + ", rect.size.height:" + rect.size.height); RCTContextSetFillColorWithUint(cairo, borderColors.left); Cairo.cairo_paint(cairo); } else { if ((hasCornerRadii)) { Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager-->not support different color for rounded rectangle! "); RCTContextSaveCurrentImage(); return; } CGPoint topLeft = new CGPoint(borderInsets.left, borderInsets.top); if (cornerInsets.topLeft.width > 0 && cornerInsets.topLeft.height > 0) { CGPoint[] points = new CGPoint[2]; CGRect tl = new CGRect ( topLeft, new CGSize(2 * cornerInsets.topLeft.width, 2 * cornerInsets.topLeft.height) ); RCTEllipseGetIntersectionsWithLine(tl, CGPointZero, topLeft, points); if (!Single.IsNaN(points[1].x) && !Single.IsNaN(points[1].y)) { topLeft = points[1]; } } CGPoint bottomLeft = new CGPoint(borderInsets.left, size.height - borderInsets.bottom); if (cornerInsets.bottomLeft.width > 0 && cornerInsets.bottomLeft.height > 0) { CGPoint[] points = new CGPoint[2]; CGRect bl = new CGRect ( new CGPoint(bottomLeft.x, bottomLeft.y - 2 * cornerInsets.bottomLeft.height), new CGSize(2 * cornerInsets.bottomLeft.width, 2 * cornerInsets.bottomLeft.height) ); CGPoint ble = new CGPoint(0, size.height); RCTEllipseGetIntersectionsWithLine(bl, ble, bottomLeft, points); if (!Single.IsNaN(points[1].x) && !Single.IsNaN(points[1].y)) { bottomLeft = points[1]; } } CGPoint topRight = new CGPoint(size.width - borderInsets.right, borderInsets.top); if (cornerInsets.topRight.width > 0 && cornerInsets.topRight.height > 0) { CGPoint[] points = new CGPoint[2]; CGRect tr = new CGRect ( new CGPoint(topRight.x - 2 * cornerInsets.topRight.width, topRight.y), new CGSize(2 * cornerInsets.topRight.width, 2 * cornerInsets.topRight.height) ); CGPoint tre = new CGPoint(size.width, 0); RCTEllipseGetIntersectionsWithLine(tr, tre, topRight, points); if (!Single.IsNaN(points[0].x) && !Single.IsNaN(points[0].y)) { topRight = points[0]; } } CGPoint bottomRight = new CGPoint(size.width - borderInsets.right, size.height - borderInsets.bottom); if (cornerInsets.bottomRight.width > 0 && cornerInsets.bottomRight.height > 0) { CGPoint[] points = new CGPoint[2]; CGRect br = new CGRect ( new CGPoint(bottomRight.x - 2 * cornerInsets.bottomRight.width, bottomRight.y - 2 * cornerInsets.bottomRight.height), new CGSize(2 * cornerInsets.bottomRight.width, 2 * cornerInsets.bottomRight.height) ); CGPoint bre = new CGPoint(size.width, size.height); RCTEllipseGetIntersectionsWithLine(br, bre, bottomRight, points); if (!Single.IsNaN(points[0].x) && !Single.IsNaN(points[0].y)) { bottomRight = points[0]; } } Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::RCTGetSolidBorderImage BGN Draw each colored Edge!"); Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] borderInsets.right:" + borderInsets.right + ", borderInsets.bottom:" + borderInsets.bottom + ", borderInsets.left:" + borderInsets.left + ", borderInsets.top:" + borderInsets.top); uint currentColor = 0; //Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_WINDING); // RIGHT if (borderInsets.right > 0) { CGPoint[] points = { new CGPoint(size.width, 0), topRight, bottomRight, new CGPoint(size.width, size.height), }; currentColor = borderColors.right; RCTContextAddLines(cairo, points, 4); } // BOTTOM if (borderInsets.bottom > 0) { CGPoint[] points = { new CGPoint(0, size.height), bottomLeft, bottomRight, new CGPoint(size.width, size.height), }; if (!(currentColor == borderColors.bottom)) { RCTContextSetFillColorWithUint(cairo, currentColor); Cairo.cairo_fill(cairo); currentColor = borderColors.bottom; } RCTContextAddLines(cairo, points, 4); } // LEFT if (borderInsets.left > 0) { CGPoint[] points = { CGPointZero, topLeft, bottomLeft, new CGPoint(0,size.height), }; if (!(currentColor == borderColors.left)) { RCTContextSetFillColorWithUint(cairo, currentColor); Cairo.cairo_fill(cairo); currentColor = borderColors.left; } RCTContextAddLines(cairo, points, 4); } // TOP if (borderInsets.top > 0) { CGPoint[] points = { CGPointZero, topLeft, topRight, new CGPoint(size.width, 0), }; if (!(currentColor == borderColors.top)) { RCTContextSetFillColorWithUint(cairo, currentColor); Cairo.cairo_fill(cairo); currentColor = borderColors.top; } RCTContextAddLines(cairo, points, 4); } RCTContextSetFillColorWithUint(cairo, currentColor); Cairo.cairo_fill(cairo); } RCTContextSaveCurrentImage(); return; }