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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
3 changed files with 15 additions and 38 deletions
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43
Userland/Libraries/LibGfx/Painter.cpp
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@ -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;
}
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];
}
dst += dst_skip;
}
return;
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);
}
ASSERT_NOT_REACHED();
if (src_rect.y() < 0) {
position.set_y(position.y() - src_rect.y());
src_rect.set_y(0);
}
blit(position, source, src_rect);
}
void Painter::blit_with_alpha(const IntPoint& position, const Gfx::Bitmap& source, const IntRect& a_src_rect)