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WindowServer: Fix alpha hit-test accessing out-of-bounds pixels
It's possible that the backing store hasn't been updated yet, so when performing an alpha hit-test make sure the bitmap actually contains it. Fixes #6731
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2 changed files with 24 additions and 10 deletions
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@ -584,17 +584,29 @@ bool WindowFrame::hit_test(const Gfx::IntPoint& point) const
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u8 alpha = 0xff;
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auto relative_point = point.translated(-render_rect().location());
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if (point.y() < window_rect.y()) {
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if (m_top_bottom)
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alpha = m_top_bottom->get_pixel(relative_point * m_top_bottom->scale()).alpha();
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if (m_top_bottom) {
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auto scaled_relative_point = relative_point * m_top_bottom->scale();
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if (m_top_bottom->rect().contains(scaled_relative_point))
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alpha = m_top_bottom->get_pixel(scaled_relative_point).alpha();
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}
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} else if (point.y() > window_rect.bottom()) {
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if (m_top_bottom)
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alpha = m_top_bottom->get_pixel(relative_point.x() * m_top_bottom->scale(), m_bottom_y * m_top_bottom->scale() + point.y() - window_rect.bottom() - 1).alpha();
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if (m_top_bottom) {
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Gfx::IntPoint scaled_relative_point { relative_point.x() * m_top_bottom->scale(), m_bottom_y * m_top_bottom->scale() + point.y() - window_rect.bottom() - 1 };
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if (m_top_bottom->rect().contains(scaled_relative_point))
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alpha = m_top_bottom->get_pixel(scaled_relative_point).alpha();
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}
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} else if (point.x() < window_rect.x()) {
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if (m_left_right)
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alpha = m_left_right->get_pixel(relative_point.x() * m_left_right->scale(), (relative_point.y() - m_bottom_y) * m_left_right->scale()).alpha();
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if (m_left_right) {
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Gfx::IntPoint scaled_relative_point { relative_point.x() * m_left_right->scale(), (relative_point.y() - m_bottom_y) * m_left_right->scale() };
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if (m_left_right->rect().contains(scaled_relative_point))
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alpha = m_left_right->get_pixel(scaled_relative_point).alpha();
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}
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} else if (point.x() > window_rect.right()) {
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if (m_left_right)
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alpha = m_left_right->get_pixel(m_right_x * m_left_right->scale() + point.x() - window_rect.right() - 1, (relative_point.y() - m_bottom_y) * m_left_right->scale()).alpha();
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if (m_left_right) {
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Gfx::IntPoint scaled_relative_point { m_right_x * m_left_right->scale() + point.x() - window_rect.right() - 1, (relative_point.y() - m_bottom_y) * m_left_right->scale() };
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if (m_left_right->rect().contains(scaled_relative_point))
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alpha = m_left_right->get_pixel(scaled_relative_point).alpha();
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}
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} else {
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return false;
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}
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