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PixelPaint: Ensure layers are positioned correctly when painting

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Previously, layer bitmaps could move slightly relative to their
boundary and the image background when panning and zooming.
This commit is contained in:
Tim Ledbetter 2023-01-05 12:26:13 +00:00 • committed by Andreas Kling
parent 607c8045dc
commit 4be6ee85e0
3 changed files with 9 additions and 10 deletions
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13
Userland/Applications/PixelPaint/Image.cpp
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@ -37,17 +37,16 @@ Image::Image(Gfx::IntSize size)
{
}
void Image::paint_into(GUI::Painter& painter, Gfx::IntRect const& dest_rect) const
void Image::paint_into(GUI::Painter& painter, Gfx::IntRect const& dest_rect, float scale) const
{
float scale = (float)dest_rect.width() / (float)rect().width();
Gfx::PainterStateSaver saver(painter);
painter.add_clip_rect(dest_rect);
for (auto const& layer : m_layers) {
if (!layer.is_visible())
continue;
auto target = dest_rect.translated(layer.location().x() * scale, layer.location().y() * scale);
auto target = dest_rect.to_type<float>().translated(layer.location().x() * scale, layer.location().y() * scale);
target.set_size(layer.size().width() * scale, layer.size().height() * scale);
painter.draw_scaled_bitmap(target, layer.display_bitmap(), layer.rect(), (float)layer.opacity_percent() / 100.0f);
painter.draw_scaled_bitmap(target.to_type<int>(), layer.display_bitmap(), layer.rect(), (float)layer.opacity_percent() / 100.0f);
}
}
@ -150,7 +149,7 @@ ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Image::compose_bitmap(Gfx::BitmapFormat form
{
auto bitmap = TRY(Gfx::Bitmap::create(format, m_size));
GUI::Painter painter(bitmap);
paint_into(painter, { 0, 0, m_size.width(), m_size.height() });
paint_into(painter, { 0, 0, m_size.width(), m_size.height() }, 1.0f);
return bitmap;
}
@ -343,7 +342,7 @@ void Image::flatten_all_layers()
auto& bottom_layer = m_layers.at(0);
GUI::Painter painter(bottom_layer.content_bitmap());
paint_into(painter, { 0, 0, m_size.width(), m_size.height() });
paint_into(painter, { 0, 0, m_size.width(), m_size.height() }, 1.0f);
for (size_t index = m_layers.size() - 1; index > 0; index--) {
auto& layer = m_layers.at(index);
@ -364,7 +363,7 @@ void Image::merge_visible_layers()
if (m_layers.at(index).is_visible()) {
auto& bottom_layer = m_layers.at(index);
GUI::Painter painter(bottom_layer.content_bitmap());
paint_into(painter, { 0, 0, m_size.width(), m_size.height() });
paint_into(painter, { 0, 0, m_size.width(), m_size.height() }, 1.0f);
select_layer(&bottom_layer);
index++;
break;