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LibGfx: Add Painter::get_pixel()

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This is required to do some painting tricks in LibWeb, this has to be
added to the painter so it can apply the paint translation first.
This commit is contained in:
MacDue 2022-06-15 21:05:58 +01:00 • committed by Linus Groh
commit 81a3ec0692
Notes: sideshowbarker 2024-07-17 22:01:16 +09:00
2 changed files with 20 additions and 10 deletions
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29
Userland/Libraries/LibGfx/Painter.cpp
View file

@ -1205,37 +1205,37 @@ void Painter::draw_scaled_bitmap(IntRect const& a_dst_rect, Gfx::Bitmap const& s
if (source.has_alpha_channel() || opacity != 1.0f) {
switch (source.format()) {
case BitmapFormat::BGRx8888:
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::BGRx8888>, opacity, scaling_mode);
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::BGRx8888>, opacity, scaling_mode);
break;
case BitmapFormat::BGRA8888:
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::BGRA8888>, opacity, scaling_mode);
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::BGRA8888>, opacity, scaling_mode);
break;
case BitmapFormat::Indexed8:
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::Indexed8>, opacity, scaling_mode);
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::Indexed8>, opacity, scaling_mode);
break;
case BitmapFormat::Indexed4:
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::Indexed4>, opacity, scaling_mode);
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::Indexed4>, opacity, scaling_mode);
break;
case BitmapFormat::Indexed2:
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::Indexed2>, opacity, scaling_mode);
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::Indexed2>, opacity, scaling_mode);
break;
case BitmapFormat::Indexed1:
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::Indexed1>, opacity, scaling_mode);
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::Indexed1>, opacity, scaling_mode);
break;
default:
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::Invalid>, opacity, scaling_mode);
do_draw_scaled_bitmap<true>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::Invalid>, opacity, scaling_mode);
break;
}
} else {
switch (source.format()) {
case BitmapFormat::BGRx8888:
do_draw_scaled_bitmap<false>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::BGRx8888>, opacity, scaling_mode);
do_draw_scaled_bitmap<false>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::BGRx8888>, opacity, scaling_mode);
break;
case BitmapFormat::Indexed8:
do_draw_scaled_bitmap<false>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::Indexed8>, opacity, scaling_mode);
do_draw_scaled_bitmap<false>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::Indexed8>, opacity, scaling_mode);
break;
default:
do_draw_scaled_bitmap<false>(*m_target, dst_rect, clipped_rect, source, src_rect, get_pixel<BitmapFormat::Invalid>, opacity, scaling_mode);
do_draw_scaled_bitmap<false>(*m_target, dst_rect, clipped_rect, source, src_rect, Gfx::get_pixel<BitmapFormat::Invalid>, opacity, scaling_mode);
break;
}
}
@ -1725,6 +1725,15 @@ void Painter::set_pixel(IntPoint const& p, Color color, bool blend)
}
}
Optional<Color> Painter::get_pixel(IntPoint const& p)
{
auto point = p;
point.translate_by(state().translation);
if (!clip_rect().contains(point / scale()))
return {};
return Color::from_argb(m_target->scanline(point.y())[point.x()]);
}
ALWAYS_INLINE void Painter::set_physical_pixel_with_draw_op(u32& pixel, Color const& color)
{
// This always sets a single physical pixel, independent of scale().