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LibGfx: Implement blit_offset() in terms of blit()

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It's less code, and blit() already handles scaled painters.

Fixes the window server asserting in highdpi mode with a centered
background image. Part of #5017.
This commit is contained in:
Nico Weber 2021-01-22 11:12:00 -05:00 committed by Andreas Kling
parent 586c0aa043
commit 2fe6a313c2
Notes: sideshowbarker 2024-07-18 23:00:41 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/2fe6a313c2a
Pull-request: https://github.com/SerenityOS/serenity/pull/5045
3 changed files with 15 additions and 38 deletions
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4
Userland/Applications/DisplaySettings/MonitorWidget.cpp
View file

@ -84,7 +84,7 @@ Gfx::Color MonitorWidget::background_color()
void MonitorWidget::paint_event(GUI::PaintEvent& event)
{
Gfx::IntRect screen_rect = { 0, 0, m_desktop_resolution.width(), m_desktop_resolution.height() };
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);
@ -93,7 +93,7 @@ void MonitorWidget::paint_event(GUI::PaintEvent& event)
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() / 2 - m_desktop_wallpaper_bitmap->size().width() / 2, screen_rect.height() / 2 - m_desktop_wallpaper_bitmap->size().height() / 2 };
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);

41
Userland/Libraries/LibGfx/Painter.cpp
View file

@ -626,40 +626,19 @@ void Painter::draw_tiled_bitmap(const IntRect& a_dst_rect, const Gfx::Bitmap& so
ASSERT_NOT_REACHED();
}
void Painter::blit_offset(const IntPoint& position, const Gfx::Bitmap& source, const IntRect& src_rect, const IntPoint& offset)
void Painter::blit_offset(const IntPoint& a_position, const Gfx::Bitmap& source, const IntRect& a_src_rect, const IntPoint& offset)
{
ASSERT(scale() == 1); // FIXME: Add scaling support.
auto dst_rect = IntRect(position, src_rect.size()).translated(translation());
auto clipped_rect = dst_rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
const int first_row = (clipped_rect.top() - dst_rect.top());
const int last_row = (clipped_rect.bottom() - dst_rect.top());
const int first_column = (clipped_rect.left() - dst_rect.left());
RGBA32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x();
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
if (source.format() == BitmapFormat::RGB32 || source.format() == BitmapFormat::RGBA32) {
int x_start = first_column + src_rect.left();
for (int row = first_row; row <= last_row; ++row) {
int sr = row - offset.y() + src_rect.top();
if (sr >= source.size().height() || sr < 0) {
dst += dst_skip;
continue;
auto src_rect = IntRect { a_src_rect.location() - offset, a_src_rect.size() };
auto position = a_position;
if (src_rect.x() < 0) {
position.set_x(position.x() - src_rect.x());
src_rect.set_x(0);
}
const RGBA32* sl = source.scanline(sr);
for (int x = x_start; x < clipped_rect.width() + x_start; ++x) {
int sx = x - offset.x();
if (sx < source.size().width() && sx >= 0)
dst[x - x_start] = sl[sx];
if (src_rect.y() < 0) {
position.set_y(position.y() - src_rect.y());
src_rect.set_y(0);
}
dst += dst_skip;
}
return;
}
ASSERT_NOT_REACHED();
blit(position, source, src_rect);
}
void Painter::blit_with_alpha(const IntPoint& position, const Gfx::Bitmap& source, const IntRect& a_src_rect)

6
Userland/Services/WindowServer/Compositor.cpp
View file

@ -257,10 +257,8 @@ void Compositor::compose()
if (m_wallpaper_mode == WallpaperMode::Simple) {
painter.blit(rect.location(), *m_wallpaper, rect);
} else if (m_wallpaper_mode == WallpaperMode::Center) {
Gfx::IntPoint offset { ws.size().width() / 2 - m_wallpaper->size().width() / 2,
ws.size().height() / 2 - m_wallpaper->size().height() / 2 };
painter.blit_offset(rect.location(), *m_wallpaper,
rect, offset);
Gfx::IntPoint offset { (ws.width() - m_wallpaper->width()) / 2, (ws.height() - m_wallpaper->height()) / 2 };
painter.blit_offset(rect.location(), *m_wallpaper, rect, offset);
} else if (m_wallpaper_mode == WallpaperMode::Tile) {
painter.draw_tiled_bitmap(rect, *m_wallpaper);
} else if (m_wallpaper_mode == WallpaperMode::Stretch) {