Reapply "LibPDF: Offset PaintStyle when painting so pattern overlaps..."

This reverts commit 7cb216c.

Author: X-yl

Userland/Libraries/LibPDF/Renderer.cpp

@@ -415,6 +415,12 @@ PDFErrorOr<void> Renderer::restore_previous_clip_after_graphics_state_restore()
 void Renderer::begin_path_paint()
 {
     m_current_path.transform(state().ctm);
+    if (state().paint_style.has<NonnullRefPtr<Gfx::PaintStyle>>()) {
+        VERIFY(!m_original_paint_style);
+        m_original_paint_style = state().paint_style.get<NonnullRefPtr<Gfx::PaintStyle>>();
+        auto translation = Gfx::AffineTransform().translate(m_current_path.bounding_box().x(), m_current_path.bounding_box().y());
+        state().paint_style = { MUST(Gfx::OffsetPaintStyle::create(state().paint_style.get<NonnullRefPtr<Gfx::PaintStyle>>(), translation)) };
+    }
 }
 
 PDFErrorOr<void> Renderer::end_path_paint()
@@ -424,6 +430,11 @@ PDFErrorOr<void> Renderer::end_path_paint()
         m_add_path_as_clip = AddPathAsClip::No;
     }
 
+    if (m_original_paint_style) {
+        state().paint_style = m_original_paint_style.release_nonnull();
+        m_original_paint_style = nullptr;
+    }
+
     // "Once a path has been painted, it is no longer defined; there is then no current path
     //  until a new one is begun with the m or re operator."
     m_current_path.clear();

Userland/Libraries/LibPDF/Renderer.h

@@ -293,6 +293,8 @@ class Renderer {
     // Only used for m_rendering_preferences.show_clipping_paths.
     void show_clipping_paths();
     Vector<Gfx::Path> m_clip_paths_to_show_for_debugging;
+    // Used to offset the PaintStyle's origin when rendering a pattern.
+    RefPtr<Gfx::PaintStyle> m_original_paint_style;
 };
 
 }