系统的简单注解 - 12 09_font.asm
2024-07-06 22:10:50
该文件用于在屏幕上显示字符。
disp_letter_font：显示字符；
数组font_0_buf到font_cnsl_buf，为各字符的点阵；
数字font_letter_mem用于记录各字符点阵的起始地址；
;===============================================================================
;=== 本程序提供字符显示功能： ===
;=== 1.字符显示函数 ===
;=== 2.各类字符数组 ===
;===============================================================================;-------------------------------------------------------------------------------
disp_letter_font: ;显示字符;输入参数：eax-高16位为Y值；低16位为X值;输入参数：bl-对应的字符编码;输入参数：cl-字符显示的颜色;输出参数：无push ebppush eax ;[ebp+8]: eaxpush ebx ;[ebp+4]: ebxpush ecx ;[ebp]: ecxmov ebp, esp;计算字符左上角点对应的显存地址xor ebx, ebxmov ebx, eaxshr eax, 16 ;ax对应Y值and ebx, 0xffff ;bx对应X值mov cx, 320 ;一行320个点mul cxadd eax, ebx ;eax中为字符左上角点在显存中的偏移mov [font_dis_saddr], eax ;记录该偏移 ;做好画点的准备mov edx, font_letter_mem ;edx为保存字符点阵的内存地址mov eax, [ebp+4] ;bl为对应字符的编码and eax, 0x0ffshl eax, 2 ;左移2位，也是乘以4add edx, eaxmov edx, [edx] mov ebx, [font_dis_saddr] ;edx设置为字符显存偏移add ebx, pic_mem_addr ;ebx指向字符对应的显存起始地址mov ecx, 16 ;每个字符16行;逐行的显示字符的点阵
_disp_a_letter: mov al, [edx]mov ah, 0 ;默认为黑色test al, 0x80jz _8@mov ah, [ebp] ;否则为红色
_8@:mov [ebx], ah inc ebxmov ah, 0 ;默认为黑色test al, 0x40jz _7@mov ah, [ebp] ;否则为红色
_7@:mov [ebx], ah inc ebx mov ah, 0 ;默认为黑色test al, 0x20jz _6@mov ah, [ebp] ;否则为红色
_6@:mov [ebx], ah inc ebx mov ah, 0 ;默认为黑色test al, 0x10jz _5@mov ah, [ebp] ;否则为红色
_5@:mov [ebx], ah inc ebx mov ah, 0 ;默认为黑色test al, 0x08jz _4@mov ah, [ebp] ;否则为红色
_4@:mov [ebx], ah inc ebx mov ah, 0 ;默认为黑色test al, 0x04jz _3@mov ah, [ebp] ;否则为红色
_3@:mov [ebx], ah inc ebx mov ah, 0 ;默认为黑色test al, 0x02jz _2@mov ah, [ebp] ;否则为红色
_2@:mov [ebx], ah inc ebx mov ah, 0 ;默认为黑色test al, 0x01jz _1@mov ah, [ebp] ;否则为红色
_1@:mov [ebx], ah inc ebx inc edx ;下一个字符add ebx, 312 ;显存地址移到下一行loop _disp_a_letterpop ecxpop ebxpop eaxpop ebpret;--------------------------------全局变量---------------------------------------
align 4font_dis_saddr dd 0x0 ;用于记录对应字符显存的首地址font_letter_mem dd font_0_buf, font_1_buf, font_2_buf, font_3_buf, dd font_4_buf, font_5_buf, font_6_buf, font_7_buf,dd font_8_buf, font_9_buf, font_a_buf, font_b_buf,dd font_c_buf, font_d_buf, font_e_buf, font_f_buf,dd font_g_buf, font_h_buf, font_i_buf, font_j_buf,dd font_k_buf, font_l_buf, font_m_buf, font_n_buf, dd font_o_buf, font_p_buf, font_q_buf, font_r_buf,dd font_s_buf, font_t_buf, font_u_buf, font_v_buf,dd font_w_buf, font_x_buf, font_y_buf, font_z_buf,dd font___buf, font_cnsl_buf font_0_buf db 0x00,0x00,0x3E,0x63,0x63,0x63,0x6B,0x6B, db 0x63,0x63,0x63,0x3E,0x00,0x00,0x00,0x00 font_1_buf db 0x00,0x00,0x0C,0x1C,0x3C,0x0C,0x0C,0x0C, db 0x0C,0x0C,0x0C,0x3F,0x00,0x00,0x00,0x00 font_2_buf db 0x00,0x00,0x3E,0x63,0x03,0x06,0x0C,0x18, db 0x30,0x61,0x63,0x7F,0x00,0x00,0x00,0x00font_3_buf db 0x00,0x00,0x3E,0x63,0x03,0x03,0x1E,0x03, db 0x03,0x03,0x63,0x3E,0x00,0x00,0x00,0x00font_4_buf db 0x00,0x00,0x06,0x0E,0x1E,0x36,0x66,0x66, db 0x7F,0x06,0x06,0x0F,0x00,0x00,0x00,0x00font_5_buf db 0x00,0x00,0x7F,0x60,0x60,0x60,0x7E,0x03, db 0x03,0x63,0x73,0x3E,0x00,0x00,0x00,0x00font_6_buf db 0x00,0x00,0x1C,0x30,0x60,0x60,0x7E,0x63, db 0x63,0x63,0x63,0x3E,0x00,0x00,0x00,0x00font_7_buf db 0x00,0x00,0x7F,0x63,0x03,0x06,0x06,0x0C, db 0x0C,0x18,0x18,0x18,0x00,0x00,0x00,0x00font_8_buf db 0x00,0x00,0x3E,0x63,0x63,0x63,0x3E,0x63, db 0x63,0x63,0x63,0x3E,0x00,0x00,0x00,0x00font_9_buf db 0x00,0x00,0x3E,0x63,0x63,0x63,0x63,0x3F, db 0x03,0x03,0x06,0x3C,0x00,0x00,0x00,0x00 font_a_buf db 0x00,0x00,0x00,0x00,0x00,0x3C,0x46,0x06, db 0x3E,0x66,0x66,0x3B,0x00,0x00,0x00,0x00font_b_buf db 0x00,0x00,0x70,0x30,0x30,0x3C,0x36,0x33,db 0x33,0x33,0x33,0x6E,0x00,0x00,0x00,0x00font_c_buf db 0x00,0x00,0x00,0x00,0x00,0x3E,0x63,0x60,db 0x60,0x60,0x63,0x3E,0x00,0x00,0x00,0x00 font_d_buf db 0x00,0x00,0x0E,0x06,0x06,0x1E,0x36,0x66,db 0x66,0x66,0x66,0x3B,0x00,0x00,0x00,0x00 font_e_buf db 0x00,0x00,0x00,0x00,0x00,0x3E,0x63,0x63,db 0x7E,0x60,0x63,0x3E,0x00,0x00,0x00,0x00 font_f_buf db 0x00,0x00,0x1C,0x36,0x32,0x30,0x7C,0x30,db 0x30,0x30,0x30,0x78,0x00,0x00,0x00,0x00 font_g_buf db 0x00,0x00,0x00,0x00,0x00,0x3B,0x66,0x66,db 0x66,0x66,0x3E,0x06,0x66,0x3C,0x00,0x00 font_h_buf db 0x00,0x00,0x70,0x30,0x30,0x36,0x3B,0x33,db 0x33,0x33,0x33,0x73,0x00,0x00,0x00,0x00 font_i_buf db 0x00,0x00,0x0C,0x0C,0x00,0x1C,0x0C,0x0C,db 0x0C,0x0C,0x0C,0x1E,0x00,0x00,0x00,0x00 font_j_buf db 0x00,0x00,0x06,0x06,0x00,0x0E,0x06,0x06,db 0x06,0x06,0x06,0x66,0x66,0x3C,0x00,0x00 font_k_buf db 0x00,0x00,0x70,0x30,0x30,0x33,0x33,0x36,db 0x3C,0x36,0x33,0x73,0x00,0x00,0x00,0x00 font_l_buf db 0x00,0x00,0x1C,0x0C,0x0C,0x0C,0x0C,0x0C,db 0x0C,0x0C,0x0C,0x1E,0x00,0x00,0x00,0x00 font_m_buf db 0x00,0x00,0x00,0x00,0x00,0x6E,0x33,0x33,db 0x33,0x33,0x33,0x33,0x00,0x00,0x00,0x00 font_n_buf db 0x00,0x00,0x00,0x00,0x00,0x6E,0x7F,0x6B,db 0x6B,0x6B,0x6B,0x6B,0x00,0x00,0x00,0x00 font_o_buf db 0x00,0x00,0x00,0x00,0x00,0x3E,0x63,0x63,db 0x63,0x63,0x63,0x3E,0x00,0x00,0x00,0x00font_p_buf db 0x00,0x00,0x00,0x00,0x00,0x6E,0x33,0x33,db 0x33,0x33,0x3E,0x30,0x30,0x78,0x00,0x00font_q_buf db 0x00,0x00,0x00,0x00,0x00,0x3B,0x66,0x66,db 0x66,0x66,0x3E,0x06,0x06,0x0F,0x00,0x00font_r_buf db 0x00,0x00,0x00,0x00,0x00,0x6E,0x3B,0x33,db 0x30,0x30,0x30,0x78,0x00,0x00,0x00,0x00font_s_buf db 0x00,0x00,0x00,0x00,0x00,0x3E,0x63,0x38,db 0x0E,0x03,0x63,0x3E,0x00,0x00,0x00,0x00font_t_buf db 0x00,0x00,0x08,0x18,0x18,0x7E,0x18,0x18,db 0x18,0x18,0x1B,0x0E,0x00,0x00,0x00,0x00font_u_buf db 0x00,0x00,0x00,0x00,0x00,0x66,0x66,0x66,db 0x66,0x66,0x66,0x3B,0x00,0x00,0x00,0x00font_v_buf db 0x00,0x00,0x00,0x00,0x00,0x63,0x63,0x36,db 0x36,0x1C,0x1C,0x08,0x00,0x00,0x00,0x00font_w_buf db 0x00,0x00,0x00,0x00,0x00,0x63,0x63,0x63,db 0x6B,0x6B,0x7F,0x36,0x00,0x00,0x00,0x00font_x_buf db 0x00,0x00,0x00,0x00,0x00,0x63,0x36,0x1C,db 0x1C,0x1C,0x36,0x63,0x00,0x00,0x00,0x00font_y_buf db 0x00,0x00,0x00,0x00,0x00,0x63,0x63,0x63,db 0x63,0x63,0x3F,0x03,0x06,0x3C,0x00,0x00font_z_buf db 0x00,0x00,0x00,0x00,0x00,0x7F,0x66,0x0C,db 0x18,0x30,0x63,0x7F,0x00,0x00,0x00,0x00font___buf db 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,db 0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00font_cnsl_buf db 0x00,0x00,0x00,0x60,0x30,0x18,0x0C,0x06,db 0x0C,0x18,0x30,0x60,0x00,0x00,0x00,0x00
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