From 2f22c4182849b1fb914b8f7c9124926de6d8d4cd Mon Sep 17 00:00:00 2001
From: Liam Galvin <liam.galvin@switchconcepts.com>
Date: Thu, 25 Oct 2018 10:15:54 +0100
Subject: [PATCH] fix osx framebuffer issues

---
 buffer/buffer.go   |  8 ++++++--
 glfont/font.go     |  6 ++++--
 glfont/truetype.go |  2 +-
 gui/gui.go         | 19 ++++++++++++-------
 4 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/buffer/buffer.go b/buffer/buffer.go
index 3b221d4..079a770 100644
--- a/buffer/buffer.go
+++ b/buffer/buffer.go
@@ -616,8 +616,6 @@ func (buffer *Buffer) incrementCursorPosition() {
 
 		buffer.cursorX++
 
-	} else {
-		fmt.Println("cursor position invalid")
 	}
 }
 
@@ -780,7 +778,13 @@ func (buffer *Buffer) DeleteChars(n int) {
 	defer buffer.emitDisplayChange()
 
 	line := buffer.getCurrentLine()
+	if int(buffer.cursorX) >= len(line.cells) {
+		return
+	}
 	before := line.cells[:buffer.cursorX]
+	if int(buffer.cursorX)+n >= len(line.cells) {
+		n = len(line.cells) - int(buffer.cursorX)
+	}
 	after := line.cells[int(buffer.cursorX)+n:]
 	line.cells = append(before, after...)
 }
diff --git a/glfont/font.go b/glfont/font.go
index d578b35..9f698fd 100644
--- a/glfont/font.go
+++ b/glfont/font.go
@@ -14,6 +14,8 @@ import (
 	"golang.org/x/image/math/fixed"
 )
 
+const DPI = 72
+
 // A Font allows rendering of text to an OpenGL context.
 type Font struct {
 	characters  map[rune]*character
@@ -213,7 +215,7 @@ func (f *Font) GetRune(r rune) (*character, error) {
 	//create new face to measure glyph diamensions
 	ttfFace := truetype.NewFace(f.ttf, &truetype.Options{
 		Size:    float64(f.scale),
-		DPI:     72,
+		DPI:     DPI,
 		Hinting: font.HintingFull,
 	})
 
@@ -257,7 +259,7 @@ func (f *Font) GetRune(r rune) (*character, error) {
 
 	//create a freetype context for drawing
 	c := freetype.NewContext()
-	c.SetDPI(72)
+	c.SetDPI(DPI)
 	c.SetFont(f.ttf)
 	c.SetFontSize(float64(f.scale))
 	c.SetClip(rgba.Bounds())
diff --git a/glfont/truetype.go b/glfont/truetype.go
index 7809e2c..cda6275 100644
--- a/glfont/truetype.go
+++ b/glfont/truetype.go
@@ -41,7 +41,7 @@ func LoadTrueTypeFont(program uint32, r io.Reader, scale float32) (*Font, error)
 
 	ttfFace := truetype.NewFace(f.ttf, &truetype.Options{
 		Size:    float64(f.scale),
-		DPI:     72,
+		DPI:     DPI,
 		Hinting: font.HintingFull,
 	})
 
diff --git a/gui/gui.go b/gui/gui.go
index dbe1511..487e5a1 100644
--- a/gui/gui.go
+++ b/gui/gui.go
@@ -37,8 +37,8 @@ func New(config *config.Config, terminal *terminal.Terminal, logger *zap.Sugared
 	return &GUI{
 		config:    config,
 		logger:    logger,
-		width:     600,
-		height:    300,
+		width:     800,
+		height:    600,
 		terminal:  terminal,
 		fontScale: 14.0,
 	}
@@ -54,16 +54,21 @@ func (gui *GUI) resize(w *glfw.Window, width int, height int) {
 	gui.width = width
 	gui.height = height
 
+	ww, wh := w.GetSize()
+
+	hScale := float32(ww) / float32(width)
+	vScale := float32(wh) / float32(height)
+
 	gui.logger.Debugf("Updating font resolution...")
 	if gui.font != nil {
-		gui.font.UpdateResolution((width), (height))
+		gui.font.UpdateResolution(int(float32(width)*hScale), int(float32(height)*vScale))
 	}
 	if gui.boldFont != nil {
-		gui.boldFont.UpdateResolution((width), (height))
+		gui.boldFont.UpdateResolution(int(float32(width)*hScale), int(float32(height)*vScale))
 	}
 
 	gui.logger.Debugf("Setting renderer area...")
-	gui.renderer.SetArea(0, 0, gui.width, gui.height)
+	gui.renderer.SetArea(0, 0, int(float32(width)*hScale), int(float32(height)*vScale))
 
 	gui.logger.Debugf("Calculating size in cols/rows...")
 	cols, rows := gui.renderer.GetTermSize()
@@ -106,7 +111,7 @@ func (gui *GUI) Render() error {
 
 	gui.logger.Debugf("Creating window...")
 	var err error
-	gui.window, err = gui.createWindow(500, 300)
+	gui.window, err = gui.createWindow(gui.width, gui.height)
 	if err != nil {
 		return fmt.Errorf("Failed to create window: %s", err)
 	}
@@ -144,7 +149,7 @@ func (gui *GUI) Render() error {
 			gui.terminal.SetDirty()
 		}
 	})
-	w, h := gui.window.GetSize()
+	w, h := gui.window.GetFramebufferSize()
 	gui.resize(gui.window, w, h)
 
 	gui.logger.Debugf("Starting pty read handling...")