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LibGfx: Add directional floating-point scaling to Painter

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This allows the painter to be scaled separately in both directions, and
not just in integer intervals. This is crucial for proper SVG viewBox
support.

Most bitmap-related things verify the scale to be one as of now.
This commit is contained in:
Matthew Olsson 2021-04-20 11:07:19 -07:00 • committed by Andreas Kling
parent 88cfaf7bf0
commit ff76a5b8d2
4 changed files with 110 additions and 143 deletions
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55
Userland/Libraries/LibGfx/Painter.h
View file

@ -37,7 +37,7 @@ public:
void fill_rect_with_gradient(Orientation, const IntRect&, Color gradient_start, Color gradient_end);
void fill_rect_with_gradient(const IntRect&, Color gradient_start, Color gradient_end);
void fill_ellipse(const IntRect&, Color);
void draw_rect(const IntRect&, Color, bool rough = false);
void draw_rect(const IntRect&, Color, bool without_corners = false);
void draw_focus_rect(const IntRect&, Color);
void draw_bitmap(const IntPoint&, const CharacterBitmap&, Color = Color());
void draw_bitmap(const IntPoint&, const GlyphBitmap&, Color = Color());
@ -99,8 +99,19 @@ public:
void add_clip_rect(const IntRect& rect);
void clear_clip_rect();
void translate(int dx, int dy) { translate({ dx, dy }); }
void translate(const IntPoint& delta) { state().translation.translate_by(delta); }
IntPoint translation() const { return transform().translation().to_type<int>(); }
template<typename T>
void translate(T dx, T dy) { transform().translate(static_cast<float>(dx), static_cast<float>(dy)); }
template<typename T>
void translate(const Point<T>& delta) { transform().translate(delta.template to_type<float>()); }
FloatPoint float_scale() const { return transform().scale(); }
int scale() const;
template<typename T>
void scale(T dx, T dy) { transform().scale(static_cast<float>(dx), static_cast<float>(dy)); }
template<typename T>
void scale(const Point<T>& delta) { transform().scale(delta.template to_type<float>()); }
Gfx::Bitmap* target() { return m_target.ptr(); }
@ -114,20 +125,42 @@ public:
IntRect clip_rect() const { return state().clip_rect; }
protected:
IntPoint translation() const { return state().translation; }
IntRect to_physical(const IntRect& r) const { return r.translated(translation()) * scale(); }
IntPoint to_physical(const IntPoint& p) const { return p.translated(translation()) * scale(); }
int scale() const { return state().scale; }
AffineTransform& transform() { return state().transform; }
const AffineTransform& transform() const { return state().transform; }
IntSize scaled(const IntSize& size) const
{
return IntSize {
static_cast<float>(size.width()) * float_scale().x(),
static_cast<float>(size.height()) * float_scale().y(),
};
}
IntRect scaled(const IntRect& rect) const
{
return IntRect {
static_cast<float>(rect.x()) * float_scale().x(),
static_cast<float>(rect.y()) * float_scale().y(),
static_cast<float>(rect.width()) * float_scale().x(),
static_cast<float>(rect.height()) * float_scale().y(),
};
}
IntRect to_physical(const IntRect& rect) { return rect.transformed(transform()).intersected(clip_rect()); }
IntPoint to_physical(const IntPoint& point) { return point.transformed(transform()).constrained(clip_rect()); }
void set_physical_pixel_with_draw_op(u32& pixel, const Color&);
void fill_physical_scanline_with_draw_op(int y, int x, int width, const Color& color);
void fill_rect_with_draw_op(const IntRect&, Color);
void blit_with_opacity(const IntPoint&, const Gfx::Bitmap&, const IntRect& src_rect, float opacity, bool apply_alpha = true);
void draw_physical_pixel(const IntPoint&, Color, int thickness = 1);
void draw_physical_pixel(const IntPoint&, Color, IntSize thickness = { 1, 1 });
void fill_physical_rect(const IntRect&, Color);
ALWAYS_INLINE bool has_integer_scale() const { return float_scale().x() == float_scale().y() && float_scale().x() == floorf(float_scale().x()); }
struct State {
const Font* font;
IntPoint translation;
int scale = 1;
AffineTransform transform;
IntRect clip_rect;
DrawOp draw_op;
};
@ -135,8 +168,6 @@ protected:
State& state() { return m_state_stack.last(); }
const State& state() const { return m_state_stack.last(); }
void fill_physical_rect(const IntRect&, Color);
IntRect m_clip_origin;
NonnullRefPtr<Gfx::Bitmap> m_target;
Vector<State, 4> m_state_stack;