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LibVideo/VP9: Create Vector2DView to limit writable ranges of contexts

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Zaggy1024 2022-11-20 20:40:50 -06:00 committed by Andreas Kling
parent 9da432f4d6
commit 448a8b8efb
Notes: sideshowbarker 2024-07-18 02:47:59 +09:00 
Author: https://github.com/Zaggy1024
Commit: https://github.com/SerenityOS/serenity/commit/448a8b8efb
Pull-request: https://github.com/SerenityOS/serenity/pull/16238
1 changed files with 61 additions and 1 deletions
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62
Userland/Libraries/LibVideo/VP9/Context.h
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@ -42,6 +42,59 @@ struct Pair {
typedef Pair<ReferenceFrameType> ReferenceFramePair;
typedef Pair<MotionVector> MotionVectorPair;
template<typename T>
class Vector2D;
template<typename T>
class Vector2DView {
public:
u32 top() const { return m_top; }
u32 left() const { return m_left; }
u32 height() const { return m_height; }
u32 width() const { return m_width; }
T const& operator[](size_t index) const { return m_storage[index]; }
size_t size() const { return m_storage->size(); }
T& at(u32 relative_row, u32 relative_column)
{
VERIFY(relative_row < height());
VERIFY(relative_column < width());
return m_storage->at(top() + relative_row, left() + relative_column);
}
T const& at(u32 relative_row, u32 relative_column) const
{
VERIFY(relative_row < height());
VERIFY(relative_column < width());
return m_storage->at(top() + relative_row, left() + relative_column);
}
Vector2DView<T> view(u32 top, u32 left, u32 height, u32 width)
{
VERIFY(top + height <= this->height());
VERIFY(left + width <= this->width());
return Vector2DView<T>(m_storage, this->top() + top, this->left() + left, height, width);
}
private:
friend class Vector2D<T>;
Vector2DView(Vector2D<T>* const storage, u32 top, u32 left, u32 height, u32 width)
: m_storage(storage)
, m_top(top)
, m_left(left)
, m_height(height)
, m_width(width)
{
}
Vector2D<T>* const m_storage;
u32 const m_top { 0 };
u32 const m_left { 0 };
u32 const m_height { 0 };
u32 const m_width { 0 };
};
template<typename T>
class Vector2D {
public:
@ -72,7 +125,7 @@ public:
u32 height() const { return m_height; }
u32 width() const { return m_width; }
size_t index_at(u32 row, u32 column) const
{
VERIFY(row < height());
@ -126,6 +179,13 @@ public:
m_storage[i] = T();
}
Vector2DView<T> view(u32 top, u32 left, u32 height, u32 width)
{
VERIFY(top + height <= this->height());
VERIFY(left + width <= this->width());
return Vector2DView<T>(this, top, left, height, width);
}
private:
u32 m_height { 0 };
u32 m_width { 0 };