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PixelPaint: Editing mask optimization

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This patch introduces a new function "Layer::editin_mask_bounding_rect"
that is used within the LevelsDialog, Luminosity and Colormasking to
process only the area where a mask was applied. Therefore we can
greatly reduce the amount of processed pixels if only a small portion
of the image was masked.
This commit is contained in:
Torstennator 2023-08-21 11:15:49 +02:00 • committed by Sam Atkins
parent b3a6ccc45b
commit 28cda85f1f
6 changed files with 55 additions and 12 deletions
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35
Userland/Applications/PixelPaint/Layer.cpp
View file

@ -453,6 +453,39 @@ Optional<Gfx::IntRect> Layer::nonempty_content_bounding_rect() const
};
}
Optional<Gfx::IntRect> Layer::editing_mask_bounding_rect() const
{
if (mask_type() != MaskType::EditingMask)
return {};
Optional<int> min_content_y;
Optional<int> min_content_x;
Optional<int> max_content_y;
Optional<int> max_content_x;
for (int y = 0; y < m_mask_bitmap->height(); ++y) {
auto scanline = m_mask_bitmap->scanline(y);
for (int x = 0; x < m_mask_bitmap->width(); ++x) {
// Do we have any alpha values?
if (scanline[x] < 0x01000000)
continue;
min_content_x = min(min_content_x.value_or(x), x);
min_content_y = min(min_content_y.value_or(y), y);
max_content_x = max(max_content_x.value_or(x), x);
max_content_y = max(max_content_y.value_or(y), y);
}
}
if (!min_content_x.has_value())
return {};
return Gfx::IntRect {
*min_content_x,
*min_content_y,
*max_content_x - *min_content_x + 1,
*max_content_y - *min_content_y + 1
};
}
ErrorOr<NonnullRefPtr<Layer>> Layer::duplicate(DeprecatedString name)
{
auto duplicated_layer = TRY(Layer::create_snapshot(m_image, *this));
@ -461,7 +494,7 @@ ErrorOr<NonnullRefPtr<Layer>> Layer::duplicate(DeprecatedString name)
return duplicated_layer;
}
Layer::MaskType Layer::mask_type()
Layer::MaskType Layer::mask_type() const
{
if (m_mask_bitmap.is_null())
return MaskType::None;