chore(gfx): Fix all sign-compare warnings

Signed-off-by: Rahix <rahix@rahix.de>

lib/gfx/framebuffer.c

@@ -2,8 +2,8 @@
 
 void fb_clear_to_color(struct framebuffer *fb, Color c)
 {
-	for (int y = 0; y < fb->height; y++) {
-		for (int x = 0; x < fb->width; x++)
+	for (size_t y = 0; y < fb->height; y++) {
+		for (size_t x = 0; x < fb->width; x++)
 			fb_setpixel(fb, x, y, c);
 	}
 }
@@ -77,7 +77,7 @@ void *fb_pixel(struct framebuffer *fb, int x, int y)
 
 	if (xo < 0 || yo < 0)
 		return NULL;
-	if (xo >= fb->width || yo >= fb->height)
+	if (xo >= (int)fb->width || yo >= (int)fb->height)
 		return NULL;
 
 	const size_t bpp = fb_bytes_per_pixel(fb);

lib/gfx/gfx.c

@@ -17,7 +17,7 @@ void gfx_setpixel(struct gfx_region *r, int x, int y, Color c)
 {
 	if (x < 0 || y < 0)
 		return;
-	if (x >= r->width || y >= r->height)
+	if ((size_t)x >= r->width || (size_t)y >= r->height)
 		return;
 
 	fb_setpixel(r->fb, r->x + x, r->y + y, c);
@@ -90,7 +90,7 @@ void gfx_puts(
 	while (*str) {
 		// if the current position plus the width of the next character
 		// would bring us outside of the display ...
-		if ((x + font->Width) > r->width) {
+		if ((x + font->Width) > (int)r->width) {
 			// ... we move down a line before printing the character
 			x = 0;
 			y += font->Height;
@@ -350,7 +350,7 @@ static void gfx_copy_region_rle_mono(
 	Color white      = gfx_color(reg, WHITE);
 	Color black      = gfx_color(reg, BLACK);
 
-	for (int i = 0; i < size; i++) {
+	for (size_t i = 0; i < size; i++) {
 		Color color    = (data[i] & 0x80) ? white : black;
 		uint8_t length = data[i] & 0x7f;
 

lib/gfx/textbuffer.c

@@ -41,7 +41,7 @@ static void scrollup(struct txt_buffer *tm)
 
 	for (int row = 0; row < last_row; row++)
 		memcpy(&tm->text[row][0], &tm->text[row + 1][0], line_size);
-	for (int col = 0; col < width_(tm); col++) {
+	for (size_t col = 0; col < width_(tm); col++) {
 		struct txt_glyph *g = &tm->text[last_row][col];
 		g->ch               = ' ';
 		g->fg_color         = tm->fg_color;
@@ -63,7 +63,7 @@ static inline void advance_cursor(struct txt_buffer *tm)
 	const int last_row = height_(tm) - 1;
 
 	tm->cursor_column++;
-	if (tm->cursor_column >= width_(tm)) {
+	if (tm->cursor_column >= (int)width_(tm)) {
 		tm->cursor_column = 0;
 		tm->cursor_row++;
 		if (tm->cursor_row > last_row)
@@ -226,9 +226,9 @@ void txt_set_cursor(struct txt_buffer *tm, int x, int y, int draw_cursor)
 {
 	tm->draw_cursor = draw_cursor;
 
-	if (x < 0 || x >= width_(tm))
+	if (x < 0 || x >= (int)width_(tm))
 		return;
-	if (y < 0 || y >= height_(tm))
+	if (y < 0 || y >= (int)height_(tm))
 		return;
 
 	tm->cursor_column = x;