From 1d6e5855e2fbc75cda078878341184f29a831fd6 Mon Sep 17 00:00:00 2001
From: mintsuki <mintsuki@protonmail.com>
Date: Fri, 5 Apr 2024 18:18:47 +0200
Subject: [PATCH] Massively reduce the default size of bump alloc pool

Also limit the resolution of the terminal if necessary and force no-canvas mode if using bump allocator
---
 backends/fb.c | 16 +++++++++++++++-
 backends/fb.h |  4 ++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/backends/fb.c b/backends/fb.c
index b501400..6717a43 100644
--- a/backends/fb.c
+++ b/backends/fb.c
@@ -35,7 +35,10 @@ void *memcpy(void *, const void *, size_t);
 #ifndef FLANTERM_FB_DISABLE_BUMP_ALLOC
 
 #ifndef FLANTERM_FB_BUMP_ALLOC_POOL_SIZE
-#define FLANTERM_FB_BUMP_ALLOC_POOL_SIZE (64*1024*1024)
+#define FLANTERM_FB_BUMP_ALLOC_POOL_SIZE 873000
+
+#define FLANTERM_FB_WIDTH_LIMIT 1920
+#define FLANTERM_FB_HEIGHT_LIMIT 1200
 #endif
 
 static uint8_t bump_alloc_pool[FLANTERM_FB_BUMP_ALLOC_POOL_SIZE];
@@ -884,6 +887,17 @@ struct flanterm_context *flanterm_fb_init(
 ) {
 #ifndef FLANTERM_FB_DISABLE_BUMP_ALLOC
     size_t orig_bump_alloc_ptr = bump_alloc_ptr;
+
+    // Limit terminal size if needed
+    if (width > FLANTERM_FB_WIDTH_LIMIT || height > FLANTERM_FB_HEIGHT_LIMIT) {
+        size_t width_limit = width > FLANTERM_FB_WIDTH_LIMIT ? FLANTERM_FB_WIDTH_LIMIT : width;
+        size_t height_limit = height > FLANTERM_FB_HEIGHT_LIMIT ? FLANTERM_FB_HEIGHT_LIMIT : height;
+
+        framebuffer = (uint32_t *)((uintptr_t)framebuffer + ((((height / 2) - (height_limit / 2)) * pitch) + (((width / 2) - (width_limit / 2)) * 4)));
+
+        width = width_limit;
+        height = height_limit;
+    }
 #endif
 
 #ifdef FLANTERM_FB_SUPPORT_BPP
diff --git a/backends/fb.h b/backends/fb.h
index 34f11e8..ae4d4f9 100644
--- a/backends/fb.h
+++ b/backends/fb.h
@@ -36,6 +36,10 @@ extern "C" {
 
 #include "../flanterm.h"
 
+#ifndef FLANTERM_FB_DISABLE_BUMP_ALLOC
+#  define FLANTERM_FB_DISABLE_CANVAS 1
+#endif
+
 #define FLANTERM_FB_FONT_GLYPHS 256
 
 struct flanterm_fb_char {