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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
parent 4f311d1660
commit 81a3ec0692
Notes: sideshowbarker 2024-07-17 22:01:16 +09:00 
Author: https://github.com/MacDue
Commit: https://github.com/SerenityOS/serenity/commit/81a3ec0692
Pull-request: https://github.com/SerenityOS/serenity/pull/14289
Reviewed-by: https://github.com/linusg
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().

1
Userland/Libraries/LibGfx/Painter.h
View file

@ -59,6 +59,7 @@ public:
void draw_ellipse_intersecting(IntRect const&, Color, int thickness = 1);
void set_pixel(IntPoint const&, Color, bool blend = false);
void set_pixel(int x, int y, Color color, bool blend = false) { set_pixel({ x, y }, color, blend); }
Optional<Color> get_pixel(IntPoint const&);
void draw_line(IntPoint const&, IntPoint const&, Color, int thickness = 1, LineStyle style = LineStyle::Solid, Color alternate_color = Color::Transparent);
void draw_triangle_wave(IntPoint const&, IntPoint const&, Color color, int amplitude, int thickness = 1);
void draw_quadratic_bezier_curve(IntPoint const& control_point, IntPoint const&, IntPoint const&, Color, int thickness = 1, LineStyle style = LineStyle::Solid);