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Fix #12086: Crash if NWidgetMatrix holds content taller than 64K pixels. 

Scale NWidgetMatrix's scrollbar count to ensure it is within limits.
pull/12151/head
Peter Nelson 2024-02-21 18:38:36 +00:00
parent 5d2e6e4efa
commit fcdf71ada8
No known key found for this signature in database
GPG Key ID: 8EF8F0A467DF75ED
2 changed files with 20 additions and 8 deletions
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18
src/widget.cpp
View File

@ -1774,8 +1774,8 @@ void NWidgetMatrix::SetClicked(int clicked)
int vpos = (this->clicked / this->widgets_x) * this->widget_h; // Vertical position of the top.
/* Need to scroll down -> Scroll to the bottom.
* However, last entry has no 'this->pip_inter' underneath, and we must stay below this->sb->GetCount() */
if (this->sb->GetPosition() < vpos) vpos += this->widget_h - this->pip_inter - 1;
this->sb->ScrollTowards(vpos);
if (this->sb->GetPosition() * this->count_adjust < vpos) vpos += this->widget_h - this->pip_inter - 1;
this->sb->ScrollTowards(vpos / this->count_adjust);
}
}
@ -1799,9 +1799,11 @@ void NWidgetMatrix::SetCount(int count)
count *= (this->sb->IsVertical() ? this->children.front()->smallest_y : this->children.front()->smallest_x) + this->pip_inter;
if (count > 0) count -= this->pip_inter; // We counted an inter too much in the multiplication above
count += this->pip_pre + this->pip_post;
this->count_adjust = CeilDiv(count, Scrollbar::GetMaxCount());
count /= this->count_adjust;
this->sb->SetCount(count);
this->sb->SetCapacity(this->sb->IsVertical() ? this->current_y : this->current_x);
this->sb->SetStepSize(this->sb->IsVertical() ? this->widget_h : this->widget_w);
this->sb->SetCapacity((this->sb->IsVertical() ? this->current_y : this->current_x) / this->count_adjust);
this->sb->SetStepSize((this->sb->IsVertical() ? this->widget_h : this->widget_w) / this->count_adjust);
}
/**
@ -1966,11 +1968,11 @@ void NWidgetMatrix::GetScrollOffsets(int &start_x, int &start_y, int &base_offs_
start_y = 0;
if (this->sb != nullptr) {
if (this->sb->IsVertical()) {
start_y = this->sb->GetPosition() / this->widget_h;
base_offs_y += -this->sb->GetPosition() + start_y * this->widget_h;
start_y = this->sb->GetPosition() * this->count_adjust / this->widget_h;
base_offs_y += -this->sb->GetPosition() * this->count_adjust + start_y * this->widget_h;
} else {
start_x = this->sb->GetPosition() / this->widget_w;
int sub_x = this->sb->GetPosition() - start_x * this->widget_w;
start_x = this->sb->GetPosition() * this->count_adjust / this->widget_w;
int sub_x = this->sb->GetPosition() * this->count_adjust - start_x * this->widget_w;
if (_current_text_dir == TD_RTL) {
base_offs_x += sub_x;
} else {

10
src/widget_type.h
View File

@ -607,6 +607,7 @@ private:
int widget_h; ///< The height of the child widget including inter spacing.
int widgets_x; ///< The number of visible widgets in horizontal direction.
int widgets_y; ///< The number of visible widgets in vertical direction.
int count_adjust; ///< Multiplier/divisor applied to count to ensure it fits below Scrollbar's storage type.
void GetScrollOffsets(int &start_x, int &start_y, int &base_offs_x, int &base_offs_y);
};
@ -697,6 +698,15 @@ public:
{
}
/**
* Get the maximum possible number of elements in a list.
* @return the maximum possible number of elements.
*/
static constexpr uint16_t GetMaxCount()
{
return std::numeric_limits<decltype(count)>::max();
}
/**
* Gets the number of elements in the list
* @return the number of elements