From e4acdac3a5051ad0658cca8b69b22fe4d150b257 Mon Sep 17 00:00:00 2001
From: Norwin Roosen <git@nroo.de>
Date: Sat, 15 Feb 2020 13:58:01 +0100
Subject: [PATCH] add funmode :^)

---
 pixelflut/api.go | 19 ++++++++++++++++++-
 render/image.go  | 14 ++++++++++++++
 render/text.go   |  7 +++++--
 rpc/repl.go      |  8 +++++++-
 4 files changed, 44 insertions(+), 4 deletions(-)

diff --git a/pixelflut/api.go b/pixelflut/api.go
index c9266b4..dc71841 100644
--- a/pixelflut/api.go
+++ b/pixelflut/api.go
@@ -8,14 +8,31 @@ import (
 	"log"
 	"net"
 	"sync"
+
+	"github.com/SpeckiJ/Hochwasser/render"
 )
 
+var funmode = true
+
 // Flut asynchronously sends the given image to pixelflut server at `address`
 //   using `conns` connections. Pixels are sent column wise, unless `shuffle`
 //   is set. Stops when stop is closed.
 // @cleanup: use FlutTask{} as arg
 func Flut(img *image.NRGBA, position image.Point, shuffle bool, address string, conns int, stop chan bool, wg *sync.WaitGroup) {
-	cmds := commandsFromImage(img, position)
+	var cmds commands
+	if funmode {
+		// do a RGB split of white
+		imgmod := render.ImgReplaceColors(img, color.NRGBA{0xff, 0xff, 0xff, 0xff}, color.NRGBA{0xff, 0, 0, 0xff})
+		cmds = append(cmds, commandsFromImage(imgmod, image.Pt(position.X-10, position.Y-10))...)
+		imgmod = render.ImgReplaceColors(img, color.NRGBA{0xff, 0xff, 0xff, 0xff}, color.NRGBA{0, 0xff, 0, 0xff})
+		cmds = append(cmds, commandsFromImage(imgmod, image.Pt(position.X+10, position.Y))...)
+		imgmod = render.ImgReplaceColors(img, color.NRGBA{0xff, 0xff, 0xff, 0xff}, color.NRGBA{0, 0, 0xff, 0xff})
+		cmds = append(cmds, commandsFromImage(imgmod, image.Pt(position.X-10, position.Y+10))...)
+		cmds = append(cmds, commandsFromImage(img, position)...)
+	} else {
+		cmds = commandsFromImage(img, position)
+	}
+
 	if shuffle {
 		cmds.Shuffle()
 	}
diff --git a/render/image.go b/render/image.go
index b7aad79..b9fe2ff 100644
--- a/render/image.go
+++ b/render/image.go
@@ -2,6 +2,7 @@ package render
 
 import (
 	"image"
+	"image/color"
 	_ "image/gif" // register gif, jpeg, png format handlers
 	_ "image/jpeg"
 	"image/png"
@@ -45,6 +46,19 @@ func ImgToNRGBA(img image.Image) *image.NRGBA {
 	return r
 }
 
+func ImgReplaceColors(img *image.NRGBA, from, to color.NRGBA) *image.NRGBA {
+	b := img.Bounds()
+	r := image.NewNRGBA(b)
+	for x := b.Min.X; x < b.Max.X; x++ {
+		for y := b.Min.Y; y < b.Max.Y; y++ {
+			if img.At(x, y) == from {
+				r.SetNRGBA(x, y, to)
+			}
+		}
+	}
+	return r
+}
+
 func ScaleImage(img image.Image, factor int) (scaled *image.NRGBA) {
 	b := img.Bounds()
 	scaledBounds := image.Rect(0, 0, b.Max.X*factor, b.Max.Y*factor)
diff --git a/render/text.go b/render/text.go
index e66ea00..91690c2 100644
--- a/render/text.go
+++ b/render/text.go
@@ -17,7 +17,7 @@ func pt(p fixed.Point26_6) image.Point {
 	}
 }
 
-func RenderText(text string, scale int, col color.Color) *image.NRGBA {
+func RenderText(text string, scale int, col, bgCol color.Color) *image.NRGBA {
 	// @incomplete: draw with texture via Drawer.Src
 	face := basicfont.Face7x13
 	stringBounds, _ := font.BoundString(face, text)
@@ -25,7 +25,10 @@ func RenderText(text string, scale int, col color.Color) *image.NRGBA {
 	b := image.Rectangle{pt(stringBounds.Min), pt(stringBounds.Max)}
 	img := image.NewNRGBA(b)
 
-	draw.Draw(img, b, image.Black, image.Point{}, draw.Src) // fill with black bg
+	// fill with black bg
+	if (bgCol != color.NRGBA{}) {
+		draw.Draw(img, b, image.NewUniform(bgCol), image.Point{}, draw.Src)
+	}
 
 	d := font.Drawer{
 		Dst:  img,
diff --git a/rpc/repl.go b/rpc/repl.go
index 0405f7c..73a49ba 100644
--- a/rpc/repl.go
+++ b/rpc/repl.go
@@ -29,6 +29,7 @@ func RunREPL(f Fluter) {
 	mode := commandMode
 	textSize := 4
 	textCol := color.NRGBA{0xff, 0xff, 0xff, 0xff}
+	bgCol := color.NRGBA{}
 
 	scanner := bufio.NewScanner(os.Stdin)
 	for scanner.Scan() {
@@ -42,7 +43,7 @@ func RunREPL(f Fluter) {
 				continue
 			}
 			t := f.getTask()
-			t.Img = render.RenderText(inputStr, textSize, textCol)
+			t.Img = render.RenderText(inputStr, textSize, textCol, bgCol)
 			f.applyTask(t)
 
 		case commandMode:
@@ -94,6 +95,11 @@ func RunREPL(f Fluter) {
 						textCol = color.NRGBA{col[0], col[1], col[2], 0xff}
 					}
 				}
+				if len(args) > 2 {
+					if col, err := hex.DecodeString(args[2]); err == nil {
+						bgCol = color.NRGBA{col[0], col[1], col[2], 0xff}
+					}
+				}
 
 			case "img":
 				if len(args) > 0 {