绘制一个简单的视图

04_day/bootpack.c

@@ -4,20 +4,54 @@ void io_out8(int port, int data);
 int io_load_eflags(void);
 void io_store_eflags(int eflags);
 
-/* 在同一个源文件中，如果想在声明前使用，需要先声明 */
+void init_palette(void);
+void set_palette(int start, int end, unsigned char *rgb);
+void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1);
+
+#define COL8_000000		0
+#define COL8_FF0000		1
+#define COL8_00FF00		2
+#define COL8_FFFF00		3
+#define COL8_0000FF		4
+#define COL8_FF00FF		5
+#define COL8_00FFFF		6
+#define COL8_FFFFFF		7
+#define COL8_C6C6C6		8
+#define COL8_840000		9
+#define COL8_008400		10
+#define COL8_848400		11
+#define COL8_000084		12
+#define COL8_840084		13
+#define COL8_008484		14
+#define COL8_848484		15
 
 void HariMain(void)
 {
-	int i; /* 声明变量i，i是32位整数 */
-	char *p; /* 声明变量p、用于BYTE [...]地址 */
+	char *vram;/* 声明变量vram、用于BYTE [...]地址 */
+	int xsize, ysize;
 
-	init_palette(); /* 设定调色板 */
+	init_palette();/* 设定调色板 */
+	vram = (char *) 0xa0000;/* 地址变量赋值 */
+	xsize = 320;
+	ysize = 200;
 
-	p = (char *) 0xa0000; /* 地址变量赋值 */
+	/* 根据 0xa0000 + x + y * 320 计算坐标 8*/
+	boxfill8(vram, xsize, COL8_008484,  0,         0,          xsize -  1, ysize - 29);
+	boxfill8(vram, xsize, COL8_C6C6C6,  0,         ysize - 28, xsize -  1, ysize - 28);
+	boxfill8(vram, xsize, COL8_FFFFFF,  0,         ysize - 27, xsize -  1, ysize - 27);
+	boxfill8(vram, xsize, COL8_C6C6C6,  0,         ysize - 26, xsize -  1, ysize -  1);
 
-	for (i = 0; i <= 0xffff; i++) {
-		p[i] = i & 0x0f;
-	}
+	boxfill8(vram, xsize, COL8_FFFFFF,  3,         ysize - 24, 59,         ysize - 24);
+	boxfill8(vram, xsize, COL8_FFFFFF,  2,         ysize - 24,  2,         ysize -  4);
+	boxfill8(vram, xsize, COL8_848484,  3,         ysize -  4, 59,         ysize -  4);
+	boxfill8(vram, xsize, COL8_848484, 59,         ysize - 23, 59,         ysize -  5);
+	boxfill8(vram, xsize, COL8_000000,  2,         ysize -  3, 59,         ysize -  3);
+	boxfill8(vram, xsize, COL8_000000, 60,         ysize - 24, 60,         ysize -  3);
+
+	boxfill8(vram, xsize, COL8_848484, xsize - 47, ysize - 24, xsize -  4, ysize - 24);
+	boxfill8(vram, xsize, COL8_848484, xsize - 47, ysize - 23, xsize - 47, ysize -  4);
+	boxfill8(vram, xsize, COL8_FFFFFF, xsize - 47, ysize -  3, xsize -  4, ysize -  3);
+	boxfill8(vram, xsize, COL8_FFFFFF, xsize -  3, ysize - 24, xsize -  3, ysize -  3);
 
 	for (;;) {
 		io_hlt();
@@ -65,3 +99,13 @@ void set_palette(int start, int end, unsigned char *rgb)
 	io_store_eflags(eflags);	/* 复原中断许可标志 */
 	return;
 }
+
+void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1)
+{
+	int x, y;
+	for (y = y0; y <= y1; y++) {
+		for (x = x0; x <= x1; x++)
+			vram[y * xsize + x] = c;
+	}
+	return;
+}