Snazz up the windows with some title bar gradients. :^)

Kernel/i386.cpp

@@ -150,6 +150,35 @@ void exception_6_handler(RegisterDump& regs)
     current->crash();
 }
 
+// 7: FPU exception
+EH_ENTRY_NO_CODE(7);
+void exception_7_handler(RegisterDump& regs)
+{
+    (void)regs;
+#ifdef FPU_EXCEPTION_DEBUG
+    kprintf("%s FPU exception: %u(%s)\n", current->isRing0() ? "Kernel" : "Process", current->pid(), current->name().characters());
+
+    word ss;
+    dword esp;
+    if (current->isRing0()) {
+        ss = regs.ds;
+        esp = regs.esp;
+    } else {
+        ss = regs.ss_if_crossRing;
+        esp = regs.esp_if_crossRing;
+    }
+
+    kprintf("pc=%w:%x ds=%w es=%w fs=%w gs=%w\n", regs.cs, regs.eip, regs.ds, regs.es, regs.fs, regs.gs);
+    kprintf("stk=%w:%x\n", ss, esp);
+    kprintf("eax=%x ebx=%x ecx=%x edx=%x\n", regs.eax, regs.ebx, regs.ecx, regs.edx);
+    kprintf("ebp=%x esp=%x esi=%x edi=%x\n", regs.ebp, esp, regs.esi, regs.edi);
+#endif
+
+    // FIXME: Do stuff.
+    asm volatile("clts");
+}
+
+
 // 13: General Protection Fault
 EH_ENTRY(13);
 void exception_13_handler(RegisterDumpWithExceptionCode& regs)
@@ -280,7 +309,6 @@ EH(2, "Unknown error")
 EH(3, "Breakpoint")
 EH(4, "Overflow")
 EH(5, "Bounds check")
-EH(7, "Coprocessor not available")
 EH(8, "Double fault")
 EH(9, "Coprocessor segment overrun")
 EH(10, "Invalid TSS")
@@ -408,7 +436,7 @@ void idt_init()
     register_interrupt_handler(0x04, _exception4);
     register_interrupt_handler(0x05, _exception5);
     register_interrupt_handler(0x06, exception_6_entry);
-    register_interrupt_handler(0x07, _exception7);
+    register_interrupt_handler(0x07, exception_7_entry);
     register_interrupt_handler(0x08, _exception8);
     register_interrupt_handler(0x09, _exception9);
     register_interrupt_handler(0x0a, _exception10);

Kernel/init.cpp

@@ -138,6 +138,10 @@ void init()
     gdt_init();
     idt_init();
 
+#ifndef NO_FPU
+    asm volatile("fninit");
+#endif
+
     VFS::initialize_globals();
     vfs = new VFS;
 

SharedGraphics/Color.h

@@ -29,6 +29,10 @@ public:
     Color(byte r, byte g, byte b) : m_value((r << 16) | (g << 8) | b) { }
     Color(RGBA32 rgba) : m_value(rgba) { }
 
+    int red() const { return (m_value >> 16) & 0xff; }
+    int green() const { return (m_value >> 8) & 0xff; }
+    int blue() const { return m_value & 0xff; }
+
     RGBA32 value() const { return m_value; }
 
 private:

SharedGraphics/Painter.cpp

@@ -74,6 +74,45 @@ void Painter::fill_rect(const Rect& a_rect, Color color)
     }
 }
 
+void Painter::fill_rect_with_gradient(const Rect& a_rect, Color gradient_start, Color gradient_end)
+{
+#ifdef NO_FPU
+    return fill_rect(a_rect, gradient_start);
+#endif
+    auto rect = a_rect;
+    rect.move_by(m_translation);
+    auto clipped_rect = Rect::intersection(rect, m_clip_rect);
+    if (clipped_rect.is_empty())
+        return;
+
+    int x_offset = clipped_rect.x() - rect.x();
+
+    RGBA32* dst = m_target->scanline(clipped_rect.top()) + clipped_rect.left();
+    const unsigned dst_skip = m_target->width();
+
+    float increment = (1.0/((rect.width())/255.0));
+
+    int r2 = gradient_start.red();
+    int g2 = gradient_start.green();
+    int b2 = gradient_start.blue();
+    int r1 = gradient_end.red();
+    int g1 = gradient_end.green();
+    int b1 = gradient_end.blue();
+
+    for (int i = clipped_rect.height() - 1; i >= 0; --i) {
+        float c = x_offset * increment;
+        for (int j = 0; j < clipped_rect.width(); ++j) {
+            dst[j] = Color(
+                r1 / 255.0 * c + r2 / 255.0 * (255 - c),
+                g1 / 255.0 * c + g2 / 255.0 * (255 - c),
+                b1 / 255.0 * c + b2 / 255.0 * (255 - c)
+            ).value();
+            c += increment;
+        }
+        dst += dst_skip;
+    }
+}
+
 void Painter::draw_rect(const Rect& a_rect, Color color)
 {
     Rect rect = a_rect;

SharedGraphics/Painter.h

@@ -23,6 +23,7 @@ public:
     explicit Painter(GraphicsBitmap&);
     ~Painter();
     void fill_rect(const Rect&, Color);
+    void fill_rect_with_gradient(const Rect&, Color gradient_start, Color gradient_end);
     void draw_rect(const Rect&, Color);
     void draw_bitmap(const Point&, const CharacterBitmap&, Color = Color());
     void set_pixel(const Point&, Color);

WindowServer/WSWindowManager.cpp

@@ -121,12 +121,15 @@ WSWindowManager::WSWindowManager()
     m_front_painter = make<Painter>(*m_front_bitmap);
     m_back_painter = make<Painter>(*m_back_bitmap);
 
-    m_background_color = Color(0, 72, 96);
-    m_active_window_border_color = Color(0, 64, 192);
+    m_background_color = Color(50, 50, 50);
+    m_active_window_border_color = Color(110, 34, 9);
+    m_active_window_border_color2 = Color(244, 202, 158);
     m_active_window_title_color = Color::White;
-    m_inactive_window_border_color = Color(64, 64, 64);
-    m_inactive_window_title_color = Color::White;
-    m_dragging_window_border_color = Color(32, 96, 216);
+    m_inactive_window_border_color = Color(128, 128, 128);
+    m_inactive_window_border_color2 = Color(192, 192, 192);
+    m_inactive_window_title_color = Color(213, 208, 199);
+    m_dragging_window_border_color = Color(161, 50, 13);
+    m_dragging_window_border_color2 = Color(250, 220, 187);
     m_dragging_window_title_color = Color::White;
 
     m_cursor_bitmap_inner = CharacterBitmap::create_from_ascii(cursor_bitmap_inner_ascii, 12, 17);
@@ -161,25 +164,29 @@ void WSWindowManager::paint_window_frame(WSWindow& window)
 
     Color title_color;
     Color border_color;
+    Color border_color2;
 
     if (&window == m_drag_window.ptr()) {
         border_color = m_dragging_window_border_color;
+        border_color2 = m_dragging_window_border_color2;
         title_color = m_dragging_window_title_color;
     } else if (&window == m_active_window.ptr()) {
         border_color = m_active_window_border_color;
+        border_color2 = m_active_window_border_color2;
         title_color = m_active_window_title_color;
     } else {
         border_color = m_inactive_window_border_color;
+        border_color2 = m_inactive_window_border_color2;
         title_color = m_inactive_window_title_color;
     }
 
-    m_back_painter->fill_rect(titleBarRect, border_color);
+    m_back_painter->fill_rect_with_gradient(titleBarRect, border_color, border_color2);
     m_back_painter->draw_rect(borderRect, Color::MidGray);
     m_back_painter->draw_rect(outerRect, border_color);
     m_back_painter->draw_rect(inner_border_rect, border_color);
     m_back_painter->draw_text(titleBarTitleRect, window.title(), Painter::TextAlignment::CenterLeft, title_color);
 
-    Color metadata_color(204, 204, 204);
+    Color metadata_color(96, 96, 96);
     char buffer[64];
     ksprintf(buffer, "%d:%d", window.pid(), window.window_id());
     m_back_painter->draw_text(titleBarTitleRect, buffer, Painter::TextAlignment::CenterRight, metadata_color);

WindowServer/WSWindowManager.h

@@ -58,10 +58,13 @@ private:
 
     Color m_background_color;
     Color m_active_window_border_color;
+    Color m_active_window_border_color2;
     Color m_active_window_title_color;
     Color m_inactive_window_border_color;
+    Color m_inactive_window_border_color2;
     Color m_inactive_window_title_color;
     Color m_dragging_window_border_color;
+    Color m_dragging_window_border_color2;
     Color m_dragging_window_title_color;
 
     HashTable<WSWindow*> m_windows;