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Code Issues Activity Actions

PixelPaint: Ensure the selection is always within image bounds

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This commit is contained in:
Tim Ledbetter 2023-03-29 18:00:59 +01:00 • committed by Sam Atkins
parent fc137a7827
commit f132751fae
8 changed files with 97 additions and 55 deletions
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19
Userland/Applications/PixelPaint/Tools/LassoSelectTool.cpp
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@ -72,11 +72,20 @@ void LassoSelectTool::on_mouseup(Layer*, MouseEvent&)
m_selecting = false;
m_top_left.translate_by(-1);
auto image_rect = m_editor->image().rect();
auto lasso_rect = Gfx::IntRect::from_two_points(m_top_left, m_bottom_right);
if (!lasso_rect.intersects(image_rect)) {
m_editor->image().selection().merge(Gfx::IntRect {}, m_merge_mode);
return;
}
if (m_path_points.last() != m_start_position)
m_path_points.append(m_start_position);
// We create a bitmap that is bigger by 1 pixel on each side
auto lasso_bitmap_rect = Gfx::IntRect::from_two_points(m_top_left, m_bottom_right).inflated(2, 2);
auto lasso_bitmap_rect = lasso_rect.inflated(2, 2);
// FIXME: It should be possible to limit the size of the lasso bitmap to the size of the canvas, as that is
// the maximum possible size of the selection.
auto lasso_bitmap_or_error = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, lasso_bitmap_rect.size());
if (lasso_bitmap_or_error.is_error())
return;
@ -97,9 +106,13 @@ void LassoSelectTool::flood_lasso_selection(Gfx::Bitmap& lasso_bitmap)
VERIFY(lasso_bitmap.bpp() == 32);
// Create Mask which will track already-processed pixels
auto selection_mask = Mask::full({ m_top_left, lasso_bitmap.size() });
auto mask_rect = Gfx::IntRect(m_top_left, lasso_bitmap.size()).intersected(m_editor->image().rect());
auto selection_mask = Mask::full(mask_rect);
auto pixel_reached = [&](Gfx::IntPoint location) {
selection_mask.set(Gfx::IntPoint(m_top_left.x() + location.x(), m_top_left.y() + location.y()), 0);
auto point_to_set = location.translated(m_top_left);
if (mask_rect.contains(point_to_set))
selection_mask.set(point_to_set, 0);
};
lasso_bitmap.flood_visit_from_point({ 0, 0 }, 0, move(pixel_reached));