started to make some things in graphical VGA driver faster

1 files changed, 22 insertions, 0 deletions

diff --git a/src/drivers/video/vga.c b/src/drivers/video/vga.c
index 5da642a..e30fd19 100644
--- a/src/drivers/video/vga.c
+++ b/src/drivers/video/vga.c
@@ -322,11 +322,33 @@ void vga_set_pixel( vga_t *vga, const int x, const int y, const vga_color_t colo
 
 void vga_draw_rectangle( vga_t *vga, const int x, const int y, const int w, const int h, const vga_color_t color )
 {
+	if( !params_ok( vga, x, y ) ) {
+		kernel_panic( "Pixel coordinates are out of bounds: (%d, %d), resolution is only (%d, %d)",
+			x, y, vga->mode.x, vga->mode.y );
+	}
+
+	if( !params_ok( vga, x + w, y + h ) ) {
+		kernel_panic( "Pixel coordinates are out of bounds: (%d, %d), resolution is only (%d, %d)",
+			x + w, y + h, vga->mode.x, vga->mode.y );
+	}
+
+	uint8_t color_idx = get_color_index( color );
+
+	for( int yy = y; yy < y + h; yy++ ) {
+		uint8_t *addr = vga->mode.segment + vga->mode.x * yy + x;
+		for( int xx = x; xx < x + w; xx++ ) {
+			*addr = color_idx;
+			addr++;
+		}
+	}
+
+	/* very slow, but educative version
 	for( int yy = y; yy < y + h; yy++ ) {
 		for( int xx = x; xx < x + w; xx++ ) {
 			vga_set_pixel( vga, xx, yy, color );
 		}
 	}
+	*/
 }
 
 void vga_clear_screen( vga_t *vga, const vga_color_t color )