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DisplaySettings: Improve wallpaper preview code

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Previously, this code would create a bitmap with the size of the screen
resolution, draw the new wallpaper into it, and then scale it down for
display inside the MonitorWidget.

This was done on every paint event, which made the code quite slow and
allocation-happy.

Instead of this, we now scale down the new wallpaper to a miniature
of the same scale as the little MonitorWidget screen. The miniature is
then used for tiling, etc. The miniature is cached and reused across
paint events if nothing else changes.
This commit is contained in:
Andreas Kling
2021-05-20 17:43:33 +02:00
parent df5f382b50
commit 3046b3467c
Notes: sideshowbarker 2024-07-18 17:42:48 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/3046b3467c4
2 changed files with 55 additions and 25 deletions
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74
Userland/Applications/DisplaySettings/MonitorWidget.cpp
View File

@@ -19,17 +19,21 @@ MonitorWidget::MonitorWidget()
{
m_desktop_resolution = GUI::Desktop::the().rect().size();
m_monitor_bitmap = Gfx::Bitmap::load_from_file("/res/graphics/monitor.png");
m_monitor_rect = { 12, 13, 280, 158 };
m_desktop_bitmap = Gfx::Bitmap::create(m_monitor_bitmap->format(), { 280, 158 });
m_monitor_rect = { { 12, 13 }, m_desktop_bitmap->size() };
set_fixed_size(304, 201);
}
bool MonitorWidget::set_wallpaper(String path)
{
auto bitmap_ptr = Gfx::Bitmap::load_from_file(path);
if (!bitmap_ptr && !path.is_empty())
if (path.is_empty())
return false;
auto bitmap = Gfx::Bitmap::load_from_file(path);
if (!bitmap)
return false;
m_desktop_wallpaper_path = move(path);
m_desktop_wallpaper_bitmap = bitmap_ptr;
m_wallpaper_bitmap = move(bitmap);
m_desktop_dirty = true;
update();
return true;
}
@@ -44,6 +48,7 @@ void MonitorWidget::set_wallpaper_mode(String mode)
if (m_desktop_wallpaper_mode == mode)
return;
m_desktop_wallpaper_mode = move(mode);
m_desktop_dirty = true;
update();
}
@@ -54,7 +59,11 @@ String MonitorWidget::wallpaper_mode()
void MonitorWidget::set_desktop_resolution(Gfx::IntSize resolution)
{
if (m_desktop_resolution == resolution)
return;
m_desktop_resolution = resolution;
m_desktop_dirty = true;
update();
}
Gfx::IntSize MonitorWidget::desktop_resolution()
@@ -67,6 +76,7 @@ void MonitorWidget::set_background_color(Gfx::Color color)
if (m_desktop_color == color)
return;
m_desktop_color = color;
m_desktop_dirty = true;
update();
}
@@ -75,33 +85,49 @@ Gfx::Color MonitorWidget::background_color()
return m_desktop_color;
}
void MonitorWidget::redraw_desktop_if_needed()
{
if (!m_desktop_dirty)
return;
m_desktop_dirty = false;
GUI::Painter painter(*m_desktop_bitmap);
painter.fill_rect(m_desktop_bitmap->rect(), m_desktop_color);
if (!m_wallpaper_bitmap)
return;
float sw = (float)m_desktop_bitmap->width() / (float)m_desktop_resolution.width();
float sh = (float)m_desktop_bitmap->height() / (float)m_desktop_resolution.height();
auto scaled_size = m_wallpaper_bitmap->size().to_type<float>().scaled_by(sw, sh).to_type<int>();
auto scaled_bitmap = m_wallpaper_bitmap->scaled(sw, sh);
if (m_desktop_wallpaper_mode == "simple") {
painter.blit({}, *scaled_bitmap, scaled_bitmap->rect());
} else if (m_desktop_wallpaper_mode == "center") {
Gfx::IntRect centered_rect { {}, scaled_size };
centered_rect.center_within(m_desktop_bitmap->rect());
painter.blit(centered_rect.location(), *scaled_bitmap, scaled_bitmap->rect());
} else if (m_desktop_wallpaper_mode == "tile") {
painter.draw_tiled_bitmap(m_desktop_bitmap->rect(), *scaled_bitmap);
} else if (m_desktop_wallpaper_mode == "stretch") {
painter.draw_scaled_bitmap(m_desktop_bitmap->rect(), *m_wallpaper_bitmap, m_wallpaper_bitmap->rect());
} else {
VERIFY_NOT_REACHED();
}
}
void MonitorWidget::paint_event(GUI::PaintEvent& event)
{
Gfx::IntRect screen_rect = { { 0, 0 }, m_desktop_resolution };
auto screen_bitmap = Gfx::Bitmap::create(m_monitor_bitmap->format(), m_desktop_resolution);
GUI::Painter screen_painter(*screen_bitmap);
screen_painter.fill_rect(screen_rect, m_desktop_color);
if (!m_desktop_wallpaper_bitmap.is_null()) {
if (m_desktop_wallpaper_mode == "simple") {
screen_painter.blit({ 0, 0 }, *m_desktop_wallpaper_bitmap, m_desktop_wallpaper_bitmap->rect());
} else if (m_desktop_wallpaper_mode == "center") {
Gfx::IntPoint offset { (screen_rect.width() - m_desktop_wallpaper_bitmap->width()) / 2, (screen_rect.height() - m_desktop_wallpaper_bitmap->height()) / 2 };
screen_painter.blit_offset(screen_rect.location(), *m_desktop_wallpaper_bitmap, screen_rect, offset);
} else if (m_desktop_wallpaper_mode == "tile") {
screen_painter.draw_tiled_bitmap(screen_bitmap->rect(), *m_desktop_wallpaper_bitmap);
} else if (m_desktop_wallpaper_mode == "stretch") {
screen_painter.draw_scaled_bitmap(screen_bitmap->rect(), *m_desktop_wallpaper_bitmap, m_desktop_wallpaper_bitmap->rect());
} else {
VERIFY_NOT_REACHED();
}
}
redraw_desktop_if_needed();
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.blit({ 0, 0 }, *m_monitor_bitmap, m_monitor_bitmap->rect());
painter.draw_scaled_bitmap(m_monitor_rect, *screen_bitmap, screen_bitmap->rect());
painter.blit(m_monitor_rect.location(), *m_desktop_bitmap, m_desktop_bitmap->rect());
#if 0
if (!m_desktop_resolution.is_null()) {