From cfc0d34a584254a9ed76620951c810771aff6f3b Mon Sep 17 00:00:00 2001
From: Alexander Hunt <me@liz.coffee>
Date: Sun, 21 Jun 2026 12:43:31 -0700
Subject: STUFF

---
 api/canvas/canvas.go      | 33 +++++++++++++++------------------
 api/canvas/canvas_test.go |  2 --
 2 files changed, 15 insertions(+), 20 deletions(-)

(limited to 'api/canvas')

diff --git a/api/canvas/canvas.go b/api/canvas/canvas.go
index 717d924..d44dd87 100644
--- a/api/canvas/canvas.go
+++ b/api/canvas/canvas.go
@@ -1,14 +1,13 @@
-// Package canvas is a single shared r/place-style grid. The append-only pixel
-// log in the database is the source of truth; periodic binary snapshots let a
-// new client load the current state without replaying all of history.
 package canvas
 
 import (
+	"compress/gzip"
 	"database/sql"
 	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
+	"strings"
 	"time"
 
 	"github.com/gorilla/websocket"
@@ -18,12 +17,12 @@ import (
 )
 
 const (
-	Rows  = 64
-	Cols  = 64
+	Rows  = 512
+	Cols  = 512
 	Scale = 8
 
-	placeCooldown     = 2 * time.Second
-	snapshotThreshold = 50
+	placeCooldown     = 500 * time.Millisecond
+	snapshotThreshold = 500
 	defaultColor      = 0xffffff
 
 	writeWait      = 10 * time.Second
@@ -32,7 +31,6 @@ const (
 	maxMessageSize = 256
 )
 
-// r/place 2017 palette.
 var palette = []int{
 	0xffffff, 0xe4e4e4, 0x888888, 0x222222,
 	0xffa7d1, 0xe50000, 0xe59500, 0xa06a42,
@@ -61,8 +59,6 @@ type outbound struct {
 	Ms   int64  `json:"ms,omitempty"`
 }
 
-// ---- snapshot / state ------------------------------------------------------
-
 func blankCanvas() []byte {
 	buf := make([]byte, Rows*Cols*3)
 	for i := 0; i < len(buf); i += 3 {
@@ -83,7 +79,6 @@ func setPixel(buf []byte, x, y, color int) {
 	buf[i+2] = byte(color)
 }
 
-// baseline returns the latest snapshot's bytes and through-id, or a blank canvas.
 func baseline(db *sql.DB) ([]byte, int64, error) {
 	snap, err := database.LatestCanvasSnapshot(db)
 	if err != nil {
@@ -138,8 +133,6 @@ func takeSnapshot(db *sql.DB) error {
 	return database.DeleteOldCanvasSnapshots(db)
 }
 
-// ---- hub -------------------------------------------------------------------
-
 type Hub struct {
 	db            *sql.DB
 	clients       map[*Client]bool
@@ -246,8 +239,6 @@ func (h *Hub) handlePlace(p placement) {
 	}
 }
 
-// ---- client ----------------------------------------------------------------
-
 type Client struct {
 	hub    *Hub
 	conn   *websocket.Conn
@@ -308,8 +299,6 @@ func (c *Client) writePump() {
 	}
 }
 
-// ---- continuations ---------------------------------------------------------
-
 type pageConfig struct {
 	Rows       int
 	Cols       int
@@ -348,7 +337,15 @@ func StateContinuation(context *types.RequestContext, req *http.Request, resp ht
 			return success(context, req, resp)
 		}
 		resp.Header().Set("Content-Type", "application/octet-stream")
-		resp.Write(buf)
+		// mostly-blank canvas, so it gzips down to almost nothing.
+		if strings.Contains(req.Header.Get("Accept-Encoding"), "gzip") {
+			resp.Header().Set("Content-Encoding", "gzip")
+			gz := gzip.NewWriter(resp)
+			defer gz.Close()
+			gz.Write(buf)
+		} else {
+			resp.Write(buf)
+		}
 		return success(context, req, resp)
 	}
 }
diff --git a/api/canvas/canvas_test.go b/api/canvas/canvas_test.go
index 324a3a1..38bb492 100644
--- a/api/canvas/canvas_test.go
+++ b/api/canvas/canvas_test.go
@@ -53,7 +53,6 @@ func TestSnapshotBakesThenReplays(t *testing.T) {
 	if err := takeSnapshot(db); err != nil {
 		t.Fatal(err)
 	}
-	// a placement after the snapshot must be replayed on top of it
 	if _, err := database.SavePixel(db, "u", 6, 6, 0x02be01); err != nil {
 		t.Fatal(err)
 	}
@@ -69,7 +68,6 @@ func TestSnapshotBakesThenReplays(t *testing.T) {
 		t.Errorf("replayed pixel = %06x, want green", got)
 	}
 
-	// snapshots are kept to one row
 	if err := takeSnapshot(db); err != nil {
 		t.Fatal(err)
 	}
-- 
cgit v1.3