From 9e640ab5c3da8598530bc678e76f8ec39b29372e Mon Sep 17 00:00:00 2001
From: Noah Petherbridge <root@kirsle.net>
Date: Thu, 30 Dec 2021 16:39:48 -0800
Subject: [PATCH] SetWindowIcon for SDL2 and Text.Update()

---
 sdl/sdl.go | 34 ++++++++++++++++++++++++++++++++++
 text.go    | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)

diff --git a/sdl/sdl.go b/sdl/sdl.go
index baba09e..9cca831 100644
--- a/sdl/sdl.go
+++ b/sdl/sdl.go
@@ -2,13 +2,16 @@
 package sdl
 
 import (
+	"bytes"
 	"fmt"
+	"image"
 	"time"
 
 	"git.kirsle.net/go/render"
 	"git.kirsle.net/go/render/event"
 	"github.com/veandco/go-sdl2/sdl"
 	"github.com/veandco/go-sdl2/ttf"
+	"golang.org/x/image/bmp"
 )
 
 // Renderer manages the SDL state.
@@ -86,6 +89,37 @@ func (r *Renderer) Setup() error {
 	return nil
 }
 
+// SetWindowIcon sets an icon for the SDL2 window.
+func (r *Renderer) SetWindowIcon(icon image.Image) error {
+	var (
+		fh = bytes.NewBuffer([]byte{}) // bitmap icon buffer
+	)
+
+	// Encode icon image to bitmap
+	err := bmp.Encode(fh, icon)
+	if err != nil {
+		return err
+	}
+
+	// Create an SDL2 RWOps from the bitmap data in memory.
+	rw, err := sdl.RWFromMem(fh.Bytes())
+	if err != nil {
+		return err
+	}
+
+	// Surface from RWOps
+	surface, err := sdl.LoadBMPRW(rw, true)
+	if err != nil {
+		return err
+	}
+	defer surface.Free()
+
+	// Set the app window icon.
+	r.window.SetIcon(surface)
+
+	return nil
+}
+
 // SetTitle sets the SDL window title.
 func (r *Renderer) SetTitle(title string) {
 	r.title = title
diff --git a/text.go b/text.go
index 4b67810..cb09985 100644
--- a/text.go
+++ b/text.go
@@ -23,3 +23,36 @@ func (t Text) String() string {
 func (t Text) IsZero() bool {
 	return t.Text == "" && t.Size == 0 && t.Color == Invisible && t.Padding == 0 && t.PadX == 0 && t.PadY == 0 && t.Stroke == Invisible && t.Shadow == Invisible
 }
+
+// Update properties on Text and return the updated copy.
+// Only non-zerovalues will cause an update.
+func (t Text) Update(other Text) Text {
+	if other.Text != "" {
+		t.Text = other.Text
+	}
+	if other.Size != 0 {
+		t.Size = other.Size
+	}
+	if !other.Color.IsZero() {
+		t.Color = other.Color
+	}
+	if other.Padding > 0 {
+		t.Padding = other.Padding
+	}
+	if other.PadX > 0 {
+		t.PadX = other.PadX
+	}
+	if other.PadY > 0 {
+		t.PadY = other.PadY
+	}
+	if !other.Stroke.IsZero() {
+		t.Stroke = other.Stroke
+	}
+	if !other.Stroke.IsZero() {
+		t.Shadow = other.Shadow
+	}
+	if other.FontFilename != "" {
+		t.FontFilename = other.FontFilename
+	}
+	return t
+}