LibPDF: Handle the gs graphical operator

Userland/Libraries/LibPDF/CommonNames.h

@@ -9,25 +9,33 @@
 #include <AK/FlyString.h>
 
 #define ENUMERATE_COMMON_NAMES(V) \
+    V(AIS)                        \
     V(ASCII85Decode)              \
     V(ASCIIHexDecode)             \
+    V(BG)                         \
+    V(BG2)                        \
+    V(BM)                         \
     V(BaseFont)                   \
     V(BlackPoint)                 \
     V(C)                          \
-    V(CalRGB)                     \
+    V(CA)                         \
     V(CCITTFaxDecode)             \
+    V(CalRGB)                     \
     V(ColorSpace)                 \
     V(Contents)                   \
     V(Count)                      \
     V(CropBox)                    \
     V(Crypt)                      \
+    V(D)                          \
     V(DCTDecode)                  \
     V(Dest)                       \
     V(DeviceCMYK)                 \
     V(DeviceGray)                 \
     V(DeviceRGB)                  \
     V(E)                          \
+    V(ExtGState)                  \
     V(F)                          \
+    V(FL)                         \
     V(Filter)                     \
     V(First)                      \
     V(Fit)                        \
@@ -41,35 +49,54 @@
     V(Font)                       \
     V(Gamma)                      \
     V(H)                          \
+    V(HT)                         \
+    V(HTO)                        \
     V(JBIG2Decode)                \
     V(JPXDecode)                  \
     V(Kids)                       \
     V(L)                          \
+    V(LC)                         \
+    V(LJ)                         \
+    V(LW)                         \
     V(LZWDecode)                  \
     V(Last)                       \
     V(Length)                     \
     V(Linearized)                 \
+    V(ML)                         \
     V(Matrix)                     \
     V(MediaBox)                   \
     V(N)                          \
     V(Next)                       \
     V(O)                          \
+    V(OP)                         \
+    V(OPM)                        \
     V(Outlines)                   \
     V(P)                          \
     V(Pages)                      \
     V(Parent)                     \
     V(Pattern)                    \
     V(Prev)                       \
+    V(RI)                         \
     V(Resources)                  \
     V(Root)                       \
     V(Rotate)                     \
     V(RunLengthDecode)            \
+    V(SA)                         \
+    V(SM)                         \
+    V(SMask)                      \
     V(T)                          \
+    V(TK)                         \
+    V(TR)                         \
+    V(TR2)                        \
     V(Title)                      \
     V(Type)                       \
+    V(UCR)                        \
+    V(UseBlackPTComp)             \
     V(UserUnit)                   \
     V(WhitePoint)                 \
-    V(XYZ)
+    V(XYZ)                        \
+    V(ca)                         \
+    V(op)
 
 namespace PDF {
 

Userland/Libraries/LibPDF/Renderer.cpp

@@ -146,7 +146,15 @@ RENDERER_HANDLER(set_dash_pattern)
 
 RENDERER_TODO(set_color_rendering_intent);
 RENDERER_TODO(set_flatness_tolerance);
-RENDERER_TODO(set_graphics_state_from_dict);
+
+RENDERER_HANDLER(set_graphics_state_from_dict)
+{
+    VERIFY(m_page.resources->contains(CommonNames::ExtGState));
+    auto dict_name = m_document->resolve_to<NameObject>(args[0])->name();
+    auto ext_gstate_dict = m_page.resources->get_dict(m_document, CommonNames::ExtGState);
+    auto target_dict = ext_gstate_dict->get_dict(m_document, dict_name);
+    set_graphics_state_from_dict(target_dict);
+}
 
 RENDERER_HANDLER(path_move)
 {
@@ -475,6 +483,27 @@ Gfx::Rect<T> Renderer::map(Gfx::Rect<T> rect) const
     return state().ctm.map(rect);
 }
 
+void Renderer::set_graphics_state_from_dict(NonnullRefPtr<DictObject> dict)
+{
+    if (dict->contains(CommonNames::LW))
+        handle_set_line_width({ dict->get_value(CommonNames::LW) });
+
+    if (dict->contains(CommonNames::LC))
+        handle_set_line_cap({ dict->get_value(CommonNames::LC) });
+
+    if (dict->contains(CommonNames::LJ))
+        handle_set_line_join({ dict->get_value(CommonNames::LJ) });
+
+    if (dict->contains(CommonNames::ML))
+        handle_set_miter_limit({ dict->get_value(CommonNames::ML) });
+
+    if (dict->contains(CommonNames::D))
+        handle_set_dash_pattern(dict->get_array(m_document, CommonNames::D)->elements());
+
+    if (dict->contains(CommonNames::FL))
+        handle_set_flatness_tolerance({ dict->get_value(CommonNames::FL) });
+}
+
 void Renderer::show_text(const String& string, int shift)
 {
     auto utf = Utf8View(string);

Userland/Libraries/LibPDF/Renderer.h

@@ -92,6 +92,7 @@ private:
     void handle_text_next_line_show_string(const Vector<Value>& args);
     void handle_text_next_line_show_string_set_spacing(const Vector<Value>& args);
 
+    void set_graphics_state_from_dict(NonnullRefPtr<DictObject>);
     // shift is the manual advance given in the TJ command array
     void show_text(const String&, int shift = 0);
     RefPtr<ColorSpace> get_color_space(const Value&);