Minor improve to the ppu performance

lib_gb/benches/lib_gb_bench.rs

@@ -3,7 +3,7 @@ use lib_gb::{apu::{
     audio_device::*, channel::Channel, 
     gb_apu::*, sound_terminal::SoundTerminal, 
     square_sample_producer::SquareSampleProducer
-}, keypad::{joypad::Joypad, joypad_provider::JoypadProvider, joypad_handler::JoypadHandler}, mmu::interrupts_handler::InterruptsHandler};
+}, keypad::{joypad::Joypad, joypad_provider::JoypadProvider, joypad_handler::JoypadHandler}, mmu::interrupts_handler::InterruptsHandler, ppu::{gb_ppu::GbPpu, gfx_device::GfxDevice}};
 
 pub fn criterion_bench(c: &mut Criterion){
     struct StubApu;
@@ -103,5 +103,35 @@ pub fn mmu_interrupt_handler_early(c:&mut Criterion){
         irh.handle_interrupts(false, 0);
     }));
 }
-criterion_group!(benches, criterion_bench, apu_sweep_tone_channel, apu_sound_terminal, keypad_joypad_handler, mmu_interrupt_handler_irq, mmu_interrupt_handler_unhalt, mmu_interrupt_handler_early);
+
+pub fn ppu_gb_ppu(c:&mut Criterion){
+    struct StubGfxDevice;
+    impl GfxDevice for StubGfxDevice{
+        fn swap_buffer(&mut self, _:&[lib_gb::ppu::gfx_device::Pixel; lib_gb::ppu::gb_ppu::SCREEN_HEIGHT * lib_gb::ppu::gb_ppu::SCREEN_WIDTH]) {}
+    }
+
+    let mut ppu = GbPpu::new(StubGfxDevice{});
+    ppu.lcd_control = 0xFF;
+    ppu.stat_register = 0b111_1000;
+    for i in 0..4{
+        let y = 16 * (i + 1);
+        for j in 0..10{
+            let x = 8 * (j + 1);
+            ppu.oam[(i*j)] = y as u8;
+            ppu.oam[(i*j) + 1] = x as u8;
+            ppu.oam[(i*j) + 2] = 0;
+            ppu.oam[(i*j) + 3] = 0b111_0000;
+
+        }
+    }
+
+    c.bench_function("Ppu", |b|b.iter(||{
+        let mut if_register = 0;
+        for _ in 0..100{
+            ppu.cycle(10, &mut if_register);
+        }
+    }));
+
+}
+criterion_group!(benches, criterion_bench, apu_sweep_tone_channel, apu_sound_terminal, keypad_joypad_handler, mmu_interrupt_handler_irq, mmu_interrupt_handler_unhalt, mmu_interrupt_handler_early, ppu_gb_ppu);
 criterion_main!(benches);

lib_gb/src/ppu/color.rs

@@ -37,6 +37,7 @@ impl PartialEq for Color{
 }
 
 impl From<Color> for Pixel{
+    #[inline]
     fn from(color: Color) -> Self {
         #[cfg(not(feature = "u16pixel"))]
         {