/*
屏幕向上滚动 函数不检查状态变化的合法性，是否处于可滚动状态由调用者判断
因此，此函数不要直接调用
*/
static void erase_upward_console_screen(unsigned int new_line_idx/*, bool rolling_one_line*/)
{
unsigned int new_line = new_line_idx;
unsigned int erased_line = dsp_ctx.window.topline;
unsigned int erased_pos_x = 0;
unsigned int erased_pos_y = 0;
unsigned int new_pos_x = 0;
unsigned int new_pos_y = 0;
unsigned int count, erased_count;
int i;
reset_up_idx();
dsp_ctx.window.topline = new_line;
while(1)
{
dsp_ctx.color = BLACK_PIX;
erased_count = draw_a_line(&erased_pos_x, &erased_pos_y, erased_line, dsp_ctx.buffer.lastchar);
/*
向屏幕打印替代的行
*/
if (new_line != dsp_ctx.buffer.lastchar)
{
dsp_ctx.color = WHITE_PIX;
count = draw_a_line(&new_pos_x, &new_pos_y, new_line, dsp_ctx.buffer.lastchar);
dsp_ctx.window.lastchar = get_buf_idx(new_line + count);
new_line = get_buf_idx(new_line + count);
if ( new_line == dsp_ctx.buffer.lastchar)
{
dsp_ctx.window.downward = 0;
}
else
{
modify_up_idx(new_pos_x, new_pos_y);
}
}
/* 屏幕刷新完毕 */
if (erased_pos_y >= dsp_ctx.max_y - 20)
break;
erased_line = get_buf_idx(erased_line + erased_count);
}
/*
维护相关数据
*/
dsp_ctx.window.pos_x = new_pos_x;
dsp_ctx.window.pos_y = new_pos_y;
dsp_ctx.color = WHITE_PIX;
return;
}
void hal_console_init(void)
{
video_console_ops.write = write_string;
dsp_ctx.window.topline = 2 * sizeof(unsigned int);
dsp_ctx.window.pos_x = 0;
dsp_ctx.window.pos_y = 0;
dsp_ctx.window.lastchar = 2 * sizeof(unsigned int);
dsp_ctx.window.downward = 0;
dsp_ctx.window.step[0] = -1;
dsp_ctx.window.step[1] = -1;
/* fix me 目前仅静态分配 */
memset(&dsp_ctx.buffer.buf, 0, CONSOLE_BUFFER_SIZE);
dsp_ctx.color = WHITE_PIX;
dsp_ctx.buffer.topline = 2 * sizeof(unsigned int);
dsp_ctx.buffer.lastchar = 2 * sizeof(unsigned int); /* */
dsp_ctx.buffer.tail_line = 2 * sizeof(unsigned int);
reset_up_idx();
/* Init the global lock */
spin_lock_init(&dsp_ctx.lock);
/* 取分辨率 */
get_screen_resolution(&dsp_ctx.max_x, &dsp_ctx.max_y, NULL);
console_cursor_setup();
console_cursor_set_height(DOTFNT_CHAR_LINE_HEIGHT);
return;
}
/**
@brief 接口，分辨率变更处理函数, 环境不足，因此目前未测试
@width[in]
@height[in]
@return void
*/
void modify_screen_resolution(unsigned long width, unsigned long height)
{
int count = 0;
/* 重绘屏幕 且屏幕首行保持不变 */
dsp_ctx.max_x = width;
dsp_ctx.max_y = height;
dsp_ctx.window.pos_x = 0;
dsp_ctx.window.pos_y = 0;
reset_up_idx();
dsp_ctx.window.lastchar = get_buf_idx(dsp_ctx.window.topline);
while (1)
{
/*
屏幕满，向上滚动
*/
if (dsp_ctx.window.pos_y >= dsp_ctx.max_y - 20)
{
break;
}
if (dsp_ctx.window.lastchar == dsp_ctx.buffer.lastchar)
{
dsp_ctx.window.downward = 0;
break;
}
else
{
/*打印一行(指屏幕)数据，或者不足一行时打印到缓存最后一个字符 count为本次处理的字节数 */
count = draw_a_line(&dsp_ctx.window.pos_x, &dsp_ctx.window.pos_y,
dsp_ctx.window.lastchar,
dsp_ctx.buffer.lastchar);
/* 更新窗口的状态 */
dsp_ctx.window.lastchar = get_buf_idx(dsp_ctx.window.lastchar + count);
modify_up_idx(dsp_ctx.window.pos_x, dsp_ctx.window.pos_y);
}
}
return;
}
/*
屏幕向下滚动 注意，此函数不是接口，实现这个功能还需要在外面包一层
目前接口还未实现，因为目前还不具备所需的条件
*/
static void erase_dnward_console_screen(int step)
{
int pos_x, pos_y;
int i;
unsigned long newline, erased_line;
unsigned long erased_count, count;
int erased_pos_x = 0;
int erased_pos_y = 0;
int new_pos_x = 0;
int new_pos_y = 0;
/*
当前已经是第一行，直接退出
*/
if (dsp_ctx.window.topline == dsp_ctx.buffer.topline)
{
return;
}
reset_up_idx();
erased_line = dsp_ctx.window.topline;
/*
定位屏幕应输出的第一行
*/
newline = erased_line;
for (i = 0; i < step; i++)
{
newline = prev_line_in_buffer(newline);
if (newline == dsp_ctx.buffer.topline)
break;
}
dsp_ctx.window.topline = newline;
/*
刷新屏幕，每次循环刷新一行
从屏幕左上角开始刷新
*/
while (1)
{
if (erased_line != dsp_ctx.buffer.lastchar)
{
dsp_ctx.color = BLACK_PIX; /* 用黑色重写本行，即擦除本行 */
erased_count = draw_a_line(&erased_pos_x, &erased_pos_y, erased_line, dsp_ctx.buffer.lastchar);
erased_line = get_buf_idx(erased_line + erased_count);
}
/*
向屏幕打印需输出的行
*/
dsp_ctx.color = WHITE_PIX;
count = draw_a_line(&new_pos_x, &new_pos_y, newline, dsp_ctx.buffer.lastchar);
dsp_ctx.window.lastchar = get_buf_idx(newline + count);
newline = get_buf_idx(newline + count);
/* 新数据已经输出到缓存末尾 */
if (newline == dsp_ctx.buffer.lastchar)
break;
modify_up_idx(new_pos_x, new_pos_y);
/* 已打印满一屏 */
if (new_pos_y >= (dsp_ctx.max_y - 20))
break;
}
dsp_ctx.window.downward = 1;
dsp_ctx.window.pos_x = new_pos_x;
dsp_ctx.window.pos_y = new_pos_y;
dsp_ctx.color = WHITE_PIX;
return;
}