From 7ad3343e9cab099c179408e1492170bae5bcca72 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Wed, 22 Apr 2020 01:46:07 +0900
Subject: [PATCH] graphicsdriver/monogame: Implement Pixels

Updates #1078
---
 internal/graphicsdriver/monogame/graphics.go | 4 ++++
 internal/graphicsdriver/monogame/image.go    | 6 +++---
 internal/monogame/monogame.go                | 9 ++++++++-
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/internal/graphicsdriver/monogame/graphics.go b/internal/graphicsdriver/monogame/graphics.go
index 035246448..ffdc3c340 100644
--- a/internal/graphicsdriver/monogame/graphics.go
+++ b/internal/graphicsdriver/monogame/graphics.go
@@ -124,6 +124,10 @@ func (s *screen) SetAsSource() {
 	panic("monogame: SetAsSource on screen is forbidden")
 }
 
+func (s *screen) Pixels(width, height int) ([]byte, error) {
+	panic("monogame: Pixels on screen is forbidden")
+}
+
 func (s *screen) ReplacePixels(args []*driver.ReplacePixelsArgs) {
 	panic("monogame: ReplacePixels on screen is forbidden")
 }
diff --git a/internal/graphicsdriver/monogame/image.go b/internal/graphicsdriver/monogame/image.go
index cab5530df..9cb4939ab 100644
--- a/internal/graphicsdriver/monogame/image.go
+++ b/internal/graphicsdriver/monogame/image.go
@@ -24,6 +24,7 @@ import (
 type RenderTarget2D interface {
 	SetAsDestination(viewportWidth, viewportHeight int)
 	SetAsSource()
+	Pixels(width, height int) ([]byte, error)
 	ReplacePixels(args []*driver.ReplacePixelsArgs)
 	Dispose()
 	IsScreen() bool
@@ -44,9 +45,8 @@ func (*Image) IsInvalidated() bool {
 	return false
 }
 
-func (*Image) Pixels() ([]byte, error) {
-	panic("monogame: Pixels is not implemented yet")
-	return nil, nil
+func (i *Image) Pixels() ([]byte, error) {
+	return i.v.Pixels(i.width, i.height)
 }
 
 func (i *Image) SetAsDestination() {
diff --git a/internal/monogame/monogame.go b/internal/monogame/monogame.go
index a1c4c9f00..c80cd7de6 100644
--- a/internal/monogame/monogame.go
+++ b/internal/monogame/monogame.go
@@ -126,7 +126,14 @@ type RenderTarget2D struct {
 
 func (r *RenderTarget2D) Dispose() {
 	runtime.SetFinalizer(r, nil)
-	r.v.Call("Dispose")
+	r.binding.Call("Dispose", r.v)
+}
+
+func (r *RenderTarget2D) Pixels(width, height int) ([]byte, error) {
+	v := r.binding.Call("Pixels", r.v, width, height)
+	bs := make([]byte, v.Length())
+	js.CopyBytesToGo(bs, v)
+	return bs, nil
 }
 
 func (r *RenderTarget2D) ReplacePixels(args []*driver.ReplacePixelsArgs) {