十六、画图
转到内核用 C语言写东西，速度就快了，先实现画图：
/* graphics.c
图形函数
四彩
2015-12-12
*/
#include "../kernel/include/graphics.h"
// 图形函数相关全局参数
static unsigned short *pVideo, Color = 0;
static unsigned short Screen_X, Screen_Y;
static unsigned char BytePerPix;
/* 画一条线
*/
void line(unsigned x0, unsigned y0, unsigned x1, unsigned y1)
{
int x, y;
if(x0 == x1)
for(y = y0; y <= y1; y++)
pVideo[Screen_X * y + x] = Color;
else if(x0 < x1)
for(x = x0; x <= x1; x++)
{
y = ((x - x0) * y1 + (x1 - x) * y0) / (x1 - x0);
pVideo[Screen_X * y + x] = Color;
}
else // if(x0 > x1)
for(x = x1; x <= x0; x++)
{
y = ((x0 - x) * y1 + (x - x1) * y0) / (x0 - x1);
pVideo[Screen_X * y + x] = Color;
}
}
/* 画一个方框并填色
*/
void rectangle(unsigned x0, unsigned y0, unsigned x1, unsigned y1)
{
unsigned x, y;
for(y = y0; y <= y1; y++)
for(x = x0; x <= x1; x++)
pVideo[Screen_X * y + x] = Color;
}
// 初始化图形参数
void InitGraphics(GRAPHICS_PARAM *ptGraphics)
{
pVideo = (unsigned short *)ptGraphics->dwPhyAddrOfVideo;
Screen_X = ptGraphics->wScreenX;
Screen_Y = ptGraphics->wScreenY;
BytePerPix = ptGraphics->bBitsPerPixel;
}
// 设置颜色
void SetColor(unsigned color)
{
Color = color;
}
unsigned GetColor()
{
return Color;
}
unsigned GetScreenX()
{
return Screen_X;
}
unsigned GetScreenY()
{
return Screen_Y;
}
kernel 做了调整，图形相关定义、函数调整到图形模块里去了。这个头文件还把图形函数引出来（这里定义的颜色可是费老劲收集到的）：
/* graphics.h
图形出函数
四彩
2015-12-12
*/
#ifndef _GRAPHICS_H
#define _GRAPHICS_H
typedef struct tag_Graphics_Param
{
unsigned dwPhyAddrOfVideo; // 显存基址
unsigned short wScreenX; // 分辨率 X
unsigned short wScreenY; // 分辨率 Y
unsigned char bBitsPerPixel; // 颜色数
} GRAPHICS_PARAM;
// RGB565 合成 16 位色宏
// r = 红（高 5 位，0 ~ 31），g = 绿（中 6 位，0 ~ 63），b = 蓝（低 5 位， 0 ~ 31）
#define RGB565(r, g, b) (unsigned short)(((r) << 11) | ((g) << 5) | (b))
// 基本色
#define COLOR16_BLACK 0b0000000000000000
#define COLOR16_WHITE 0b1111111111111111
#define COLOR16_RED 0b1111100000000000 // 红
#define COLOR16_GREEN 0b0000011111100000 // 绿
#define COLOR16_BLUE 0b0000000000011111 // 蓝
#define COLOR16_YELLOW (COLOR16_RED | COLOR16_GREEN) // 黄
#define COLOR16_MAGENTA (COLOR16_RED | COLOR16_BLUE) // 洋红
#define COLOR16_CYAN (COLOR16_GREEN | COLOR16_BLUE) // 青
// 常见 RGB565 合成色
// 红色系
#define COLOR16_DARKRED RGB565(17, 0, 0) // 暗红
// 绿色系
#define COLOR16_PALEGREEN RGB565(19, 62, 19) // 淡绿
#define COLOR16_GREENYELLOW RGB565(21, 63, 5) // 黄绿
// 蓝色系
#define COLOR16_LIGHTBLUE RGB565(21, 54, 28) // 亮蓝
#define COLOR16_MEDIUMBLUE RGB565( 0, 0, 25) // 中蓝
#define COLOR16_DARKBLUE RGB565( 0, 0, 17) // 暗蓝
#define COLOR16_BABYBLUE RGB565(28, 63, 31) // 浅蓝
#define COLOR16_SKYBLUE RGB565(16, 51, 29) // 天蓝
#define COLOR16_LIGHTSKYBLUE RGB565(16, 51, 31) // 亮天蓝
#define COLOR16_DEEPSKYBLUE RGB565( 0, 41, 31) // 暗天蓝
// 黄色系
// 橙色系
#define COLOR16_ORANGE RGB565(31, 41, 0) // 橙
// 灰色系
#define COLOR16_GRAY RGB565(16, 32, 16) // 灰
#define COLOR16_LIGHTGRAY RGB565(26, 52, 26) // 亮灰
#define COLOR16_DARKGRAY RGB565(21, 42, 21) // 暗灰
// 紫色系
#define COLOR16_PURPLE RGB565(16, 0, 16) // 紫
#define COLOR16_LIGHTVIOLET RGB565(29, 32, 29) // 亮紫
#define COLOR16_MEDIUMPURPLE RGB565(18, 28, 27) // 中紫
#define COLOR16_DARKVIOLET RGB565(18, 0, 26) // 暗紫
// 褐色系
#define COLOR16_BROWN RGB565(20, 10, 5) // 棕褐
// 设置部分
void InitGraphics(GRAPHICS_PARAM *ptGraphics);
void SetColor(unsigned color);
// 取参数部分
unsigned GetColor();
unsigned GetScreenX();
unsigned GetScreenY();
// 绘图部分
void line(unsigned x0, unsigned y0, unsigned x1, unsigned y1);
void rectangle(unsigned x0, unsigned y0, unsigned x1, unsigned y1);
#endif
kernel 增加了一个简单的界面
/* kernel.c
内核
whoozit
2012-12-12
*/
#include "../lib/include/stddef.h"
#include "../lib/include/string.h"
#include "../kernel/include/PMode.h"
#include "../kernel/include/graphics.h"
// 存放全局变量的物理地址（const.inc 中的 SEGMENTOFGPARAM * 0x10）
#define PHYADDROFGPARAM 0x500
// 全局变量结构
typedef struct tag_Global_param
{
unsigned int dwMemorySize;
GRAPHICS_PARAM tGraphics;
} GLOBAL_PARAM;
// 引用汇编指令函数
extern void asm_hlt();
void c_main()
{
unsigned i, j;
unsigned short Screen_X, Screen_Y;
char string[80], number[33];
GLOBAL_PARAM g_Param;
// 初始化 GDT 表
InitGdt();
// 取全局变量
memcpy((void *)&g_Param, (void *)(PHYADDROFGPARAM), sizeof(GLOBAL_PARAM));
// 初始化图形参数
InitGraphics(&(g_Param.tGraphics));
Screen_X = GetScreenX();
Screen_Y = GetScreenY();
// 画界面
SetColor(COLOR16_DEEPSKYBLUE);
rectangle(0, 0, Screen_X - 1, Screen_Y - 1);
SetColor(COLOR16_LIGHTGRAY);
rectangle(0, Screen_Y - 28, Screen_X - 1, Screen_Y - 28);
rectangle(0, Screen_Y - 26, Screen_X - 1, Screen_Y - 1);
SetColor(COLOR16_WHITE);
rectangle(0, Screen_Y - 27, Screen_X - 1, Screen_Y - 27);
rectangle(3, Screen_Y - 24, 59, Screen_Y - 24);
rectangle(2, Screen_Y - 24, 2, Screen_Y - 4);
rectangle(2, Screen_Y - 3, 59, Screen_Y - 3);
rectangle(60, Screen_Y - 24, 60, Screen_Y - 3);
rectangle(Screen_X - 47, Screen_Y - 3, Screen_X - 4, Screen_Y - 3);
rectangle(Screen_X - 3, Screen_Y - 24, Screen_X - 3, Screen_Y - 3);
SetColor(COLOR16_DARKGRAY);
rectangle(3, Screen_Y - 4, 59, Screen_Y - 4);
rectangle(59, Screen_Y - 23, 59, Screen_Y - 5);
rectangle(Screen_X - 47, Screen_Y - 24, Screen_X - 4, Screen_Y - 24);
rectangle(Screen_X - 47, Screen_Y - 23, Screen_X - 47, Screen_Y - 4);
while(1)
asm_hlt();
}
Makefile 里增加了图形文件（一个.c、一个.h）的编译，其他文件没有变化。运行效果图：
