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https://github.com/RGBCube/serenity
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PixelPaint: Move "marching ants" painting logic to ImageEditor
Since this code needs to look at a bunch of ImageEditor state anyway, it makes more sense for it to live in ImageEditor.
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commit
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5 changed files with 116 additions and 108 deletions
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@ -10,95 +10,9 @@
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namespace PixelPaint {
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constexpr int marching_ant_length = 4;
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void Selection::paint(Gfx::Painter& painter)
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{
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draw_marching_ants(painter, m_mask);
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}
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Selection::Selection(ImageEditor& editor)
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: m_editor(editor)
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{
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m_marching_ants_timer = Core::Timer::create_repeating(80, [this] {
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++m_marching_ants_offset;
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m_marching_ants_offset %= (marching_ant_length * 2);
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if (!is_empty() || m_in_interactive_selection)
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m_editor.update();
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});
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m_marching_ants_timer->start();
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}
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void Selection::draw_marching_ants(Gfx::Painter& painter, Gfx::IntRect const& rect) const
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{
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// Top line
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for (int x = rect.left(); x <= rect.right(); ++x)
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draw_marching_ants_pixel(painter, x, rect.top());
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// Right line
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for (int y = rect.top() + 1; y <= rect.bottom(); ++y)
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draw_marching_ants_pixel(painter, rect.right(), y);
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// Bottom line
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for (int x = rect.right() - 1; x >= rect.left(); --x)
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draw_marching_ants_pixel(painter, x, rect.bottom());
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// Left line
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for (int y = rect.bottom() - 1; y > rect.top(); --y)
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draw_marching_ants_pixel(painter, rect.left(), y);
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}
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void Selection::draw_marching_ants(Gfx::Painter& painter, Mask const& mask) const
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{
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// If the zoom is < 100%, we can skip pixels to save a lot of time drawing the ants
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int step = max(1, (int)floorf(1.0f / m_editor.scale()));
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// Only check the visible selection area when drawing for performance
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auto rect = m_editor.rect();
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rect = Gfx::enclosing_int_rect(m_editor.frame_to_content_rect(rect));
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rect.inflate(step * 2, step * 2); // prevent borders from having visible ants if the selection extends beyond it
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// Scan the image horizontally to find vertical borders
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for (int y = rect.top(); y <= rect.bottom(); y += step) {
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bool previous_selected = false;
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for (int x = rect.left(); x <= rect.right(); x += step) {
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bool this_selected = mask.get(x, y) > 0;
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if (this_selected != previous_selected) {
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Gfx::IntRect image_pixel { x, y, 1, 1 };
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auto pixel = m_editor.content_to_frame_rect(image_pixel).to_type<int>();
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auto end = max(pixel.top(), pixel.bottom()); // for when the zoom is < 100%
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for (int pixel_y = pixel.top(); pixel_y <= end; pixel_y++) {
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draw_marching_ants_pixel(painter, pixel.left(), pixel_y);
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}
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}
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previous_selected = this_selected;
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}
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}
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// Scan the image vertically to find horizontal borders
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for (int x = rect.left(); x <= rect.right(); x += step) {
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bool previous_selected = false;
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for (int y = rect.top(); y <= rect.bottom(); y += step) {
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bool this_selected = mask.get(x, y) > 0;
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if (this_selected != previous_selected) {
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Gfx::IntRect image_pixel { x, y, 1, 1 };
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auto pixel = m_editor.content_to_frame_rect(image_pixel).to_type<int>();
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auto end = max(pixel.left(), pixel.right()); // for when the zoom is < 100%
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for (int pixel_x = pixel.left(); pixel_x <= end; pixel_x++) {
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draw_marching_ants_pixel(painter, pixel_x, pixel.top());
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}
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}
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previous_selected = this_selected;
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}
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}
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}
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void Selection::clear()
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@ -127,15 +41,4 @@ void Selection::merge(Mask const& mask, MergeMode mode)
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}
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}
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void Selection::draw_marching_ants_pixel(Gfx::Painter& painter, int x, int y) const
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{
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int pattern_index = x + y + m_marching_ants_offset;
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if (pattern_index % (marching_ant_length * 2) < marching_ant_length) {
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painter.set_pixel(x, y, Color::Black);
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} else {
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painter.set_pixel(x, y, Color::White);
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}
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}
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}
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