Refactor framebuffer handling and remove redundant variables. (not tested on baremetal)

- Removed the 'fb_width_from_pitch' variable and replaced its usage with 'sys_framebuffer_pidth' to standardize the handling of framebuffer width-from-pitch across the codebase.
- Updated references to 'fb_width_from_pitch' in display and screen update functions to use 'sys_framebuffer_pidth', ensuring consistent calculations.
- Replaced 'sys_framebuffer_pitch / (sys_framebuffer_bpp / 8)' with 'sys_framebuffer_pidth' to avoid redundant calculations and improve code readability.
- Fixed framebuffer calculations in 'GrCalcScreenUpdates', 'GrUpdateScreen32', and related functions to use the correct framebuffer width-from-pitch value.
- Corrected and simplified screen update logic in 'GrZoomInScreen' and 'GrUpdateScreen'.

src/Kernel/Display.ZC

@@ -8,9 +8,7 @@ See also $LK,"GrUpdateScreen",A="MN:GrUpdateScreen"$().
 */
 	I64  i, row, col, x, y;
 	U32 *framebuffer;
-	U64  ch_bitmap, fb_width_from_pitch;
+	U64  ch_bitmap;
-
-	fb_width_from_pitch = sys_framebuffer_pitch / (sys_framebuffer_bpp / 8);
 
 	if (!(text.raw_flags & RAWF_SHOW_DOLLAR))
 	{
@@ -62,17 +60,17 @@ See also $LK,"GrUpdateScreen",A="MN:GrUpdateScreen"$().
 		{//Scroll screen down
 
 			MemCopy(text.fb_alias,
-					text.fb_alias		+ fb_width_from_pitch * FONT_HEIGHT,
+					text.fb_alias		+ sys_framebuffer_pidth * FONT_HEIGHT,
-					(text.screen_size	- fb_width_from_pitch * FONT_HEIGHT) * sizeof(U32));
+					(text.screen_size	- sys_framebuffer_pidth * FONT_HEIGHT) * sizeof(U32));
 
-			MemSetU32(text.fb_alias + text.screen_size - fb_width_from_pitch * FONT_HEIGHT, BLACK32, fb_width_from_pitch * FONT_HEIGHT);
+			MemSetU32(text.fb_alias + text.screen_size - sys_framebuffer_pidth * FONT_HEIGHT, BLACK32, sys_framebuffer_pidth * FONT_HEIGHT);
 			text.raw_col -= text.cols ;
 			row = text.rows - 1;
 		}
 		x = col * FONT_WIDTH;
 		y = row * FONT_HEIGHT;
 		ch_bitmap = text.font[ch & 0xFF];
-		framebuffer = text.fb_alias + fb_width_from_pitch * y + x;
+		framebuffer = text.fb_alias + sys_framebuffer_pidth * y + x;
 
 		PUSHFD
 		CLI
@@ -83,7 +81,7 @@ See also $LK,"GrUpdateScreen",A="MN:GrUpdateScreen"$().
 			else
 				*framebuffer++ = BLACK32;
 			if (i & (FONT_WIDTH - 1) == FONT_WIDTH - 1)
-				framebuffer += fb_width_from_pitch - FONT_WIDTH;
+				framebuffer += sys_framebuffer_pidth - FONT_WIDTH;
 			ch_bitmap >>= 1;
 		}
 		POPFD

src/Kernel/KMain.ZC

@@ -91,7 +91,8 @@ U0 SysGrInit()
 	text.cols = sys_framebuffer_width  / FONT_WIDTH;
 	text.rows = sys_framebuffer_height / FONT_HEIGHT;
 
-	text.screen_size	= sys_framebuffer_pitch / (sys_framebuffer_bpp / 8) * sys_framebuffer_height;
+	sys_framebuffer_pidth = sys_framebuffer_pitch / (sys_framebuffer_bpp / 8);
+	text.screen_size	= sys_framebuffer_pidth * sys_framebuffer_height;
 	text.buffer_size	= text.screen_size * 4; //buffer for 32-bit, but only 16 colors now.
 	text.raw_screen		= CAlloc(text.buffer_size);
 	text.fb_alias		= sys_framebuffer_addr;

src/Kernel/KernelB.HH

@@ -249,7 +249,7 @@ public _extern SYS_FRAMEBUFFER_WIDTH	U64	sys_framebuffer_width;
 public _extern SYS_FRAMEBUFFER_HEIGHT	U64	sys_framebuffer_height;
 public _extern SYS_FRAMEBUFFER_PITCH	U64	sys_framebuffer_pitch;
 public _extern SYS_FRAMEBUFFER_BPP		U8	sys_framebuffer_bpp;
-
+public									U64	sys_framebuffer_pidth;
 _extern SYS_FRAMEBUFFER_LIST CVideoInfo sys_framebuffer_list[VBE_MODES_NUM];
 
 #help_index "Processor/SMBIOS"

src/System/Gr/GrGlobals.ZC

@@ -56,3 +56,5 @@ DefinePrint("TEXT_ROWS", "%d", text.rows);;
 HashPublic("TEXT_ROWS", HTT_DEFINE_STR);;
 DefinePrint("TEXT_COLS", "%d", text.cols);;
 HashPublic("TEXT_COLS", HTT_DEFINE_STR);;
+
+sys_framebuffer_pidth = sys_framebuffer_pitch / (sys_framebuffer_bpp / 8);

src/System/Gr/GrScreen.ZC

@@ -142,8 +142,8 @@ public U0 GrScaleZoom(F64 scale)
 	mouse.offset.x = mouse.pos.x - (mouse.pos.x - mouse.offset.x) * s;
 	mouse.offset.y = mouse.pos.y - (mouse.pos.y - mouse.offset.y) * s;
 	mouse.offset.z = mouse.pos.z - (mouse.pos.z - mouse.offset.z) * s;
-	gr.sx = mouse.pos.x - gr.zoomed_dc->width  >> 1 / gr.screen_zoom;
+	gr.sx = mouse.pos.x - GR_WIDTH  >> 1 / gr.screen_zoom;
-	gr.sy = mouse.pos.y - gr.zoomed_dc->height >> 1 / gr.screen_zoom;
+	gr.sy = mouse.pos.y - GR_HEIGHT >> 1 / gr.screen_zoom;
 	GrFixZoomScale;
 }
 
@@ -154,7 +154,7 @@ U0 GrZoomInScreen()
 
 	GrFixZoomScale;
 
-	src = gr.dc2->body + gr.sx + gr.sy * gr.dc2->width_internal;
+	src = gr.dc2->body + gr.sx + gr.sy * GR_WIDTH;
 	dst = gr.zoomed_dc->body;
 
 	for (i = 0; i < GR_HEIGHT / gr.screen_zoom; i++)
@@ -359,34 +359,35 @@ U0 DCBlotColor8(CDC *dc, CDC *img)
 
 U0 GrCalcScreenUpdates()
 {
-	U8 *screen, *last_screen = gr.screen_cache;
+	U8 *screen, reg RCX *last_screen = gr.screen_cache;
-	U32 i, *src = text.raw_screen, *dst = text.fb_alias, diffs_size = GR_WIDTH * GR_HEIGHT;
+	U32 *src = text.raw_screen, *dst = text.fb_alias;
-	U64 x, y, w = sys_framebuffer_pitch / (sys_framebuffer_bpp / 8);
+	U64 i, j, x, y, yi;
 
 	if (gr.screen_zoom == 1)
 		screen = gr.dc2->body;
 	else
 		screen = gr.zoomed_dc->body;
 
-	for (y = 0; y < GR_HEIGHT; y++)
+	for (y = yi = 0; y < GR_HEIGHT; yi = ++y * GR_WIDTH)
 	{
 		for (x = 0; x < GR_WIDTH; x++)
 		{
-			i = x + y * GR_WIDTH;
+			i = x + yi;
+			j = x + y * sys_framebuffer_pidth;
 			if (screen[i] != last_screen[i])
 			{
-				dst = text.fb_alias + x + y * w;
+				dst = text.fb_alias + j;
-				src = text.raw_screen + x + y * w;
+				src = text.raw_screen + j;
 				*dst = *src;
 			}
 		}
 	}
-	MemCopy(gr.screen_cache, screen, diffs_size);
+	MemCopy(gr.screen_cache, screen, GR_WIDTH * GR_HEIGHT);
 }
 
 U0 GrUpdateScreen32()
 {
-	U64 x, y, wi, yi, w = sys_framebuffer_pitch / (sys_framebuffer_bpp / 8);
+	U64 x, y, j, i;
 	U32 *dst;
 	U8 *src;
 
@@ -397,12 +398,12 @@ U0 GrUpdateScreen32()
 		GrZoomInScreen;
 		src = gr.zoomed_dc->body;
 	}
-	for (y = 0; y < GR_HEIGHT; y++)
+	for (y = j = i = 0; y < GR_HEIGHT; j = ++y * sys_framebuffer_pidth, i = y * GR_WIDTH)
 	{
 		for (x = 0; x < GR_WIDTH; x++)
 		{
-			dst = text.raw_screen + x + y * w;
+			dst = text.raw_screen + x + j;
-			*dst = gr_palette[src[x + y * GR_WIDTH] & 0xFF];
+			*dst = gr_palette[src[x + i] & 0xFF];
 		}
 	}
 
@@ -430,6 +431,6 @@ U0 GrUpdateScreen()
 		(*gr.fp_final_screen_update)(dc);
 	DCDel(dc);
 
-	DCBlotColor4(gr.dc1->body, gr.dc2->body, gr.dc_cache->body, gr.dc2->height * gr.dc2->width_internal >> 3);
+	DCBlotColor4(gr.dc1->body, gr.dc2->body, gr.dc_cache->body, GR_HEIGHT * GR_WIDTH >> 3);
 	GrUpdateScreen32;
 }