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Patch gui_fb to work at high-resolutions

This commit is contained in:
Ehmry - 2021-04-14 12:01:18 +02:00
parent 2840ba6b1f
commit 690d21cbaa
2 changed files with 60 additions and 1 deletions
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2
packages/genodelabs/depot-targets.nix
View File

@ -88,7 +88,7 @@ in {
gpt_write.portInputs = with ports; [ jitterentropy ];
grep = { };
gui_fader = { };
gui_fb = { };
gui_fb.patches = [ ./patches/gui_fb.patch ];
icu = { };
imx53_qsb_drivers = { };
imx8_fb_drv = { };

59
packages/genodelabs/patches/gui_fb.patch Normal file
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@ -0,0 +1,59 @@
From 92f7d224725ef3952924e230d2b41b58c043b9e3 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Wed, 14 Apr 2021 11:51:38 +0200
Subject: [PATCH] gui_fb: always set a usable framebuffer mode
Reduce the size of a requested mode until there is sufficient RAM
to render that mode, rather than refuse to set a mode at all.
---
repos/os/src/server/gui_fb/main.cc | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/repos/os/src/server/gui_fb/main.cc b/repos/os/src/server/gui_fb/main.cc
index 923208896e..8ce9710224 100644
--- a/repos/os/src/server/gui_fb/main.cc
+++ b/repos/os/src/server/gui_fb/main.cc
@@ -121,7 +121,7 @@ struct Framebuffer::Session_component : Genode::Rpc_object<Framebuffer::Session>
bool _dataspace_is_new = true;
- bool _ram_suffices_for_mode(Framebuffer::Mode mode) const
+ bool ram_suffices_for_mode(Framebuffer::Mode mode) const
{
/* calculation in bytes */
size_t const used = _buffer_num_bytes,
@@ -153,11 +153,6 @@ struct Framebuffer::Session_component : Genode::Rpc_object<Framebuffer::Session>
Framebuffer::Mode const mode { .area = size };
- if (!_ram_suffices_for_mode(mode)) {
- Genode::warning("insufficient RAM for mode ", mode);
- return;
- }
-
_next_mode = mode;
if (_mode_sigh.valid())
@@ -372,7 +367,18 @@ struct Nit_fb::Main : View_updater
if (height < 0) height = gui_height + height;
}
- fb_session.size(Area(width, height));
+ Framebuffer::Mode mode { .area = Area(width, height) };
+
+ if (!fb_session.ram_suffices_for_mode(mode))
+ Genode::warning("insufficient RAM for mode ", mode);
+
+ while (!fb_session.ram_suffices_for_mode(mode)) {
+ mode.area = Area(
+ (mode.area.w() / 4) * 3,
+ (mode.area.h() / 4) * 3);
+ }
+
+ fb_session.size(mode.area);
}
void handle_config_update()
--
2.31.0