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update Atlas200DKSPILCD/fb_test_gradient.c.

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Signed-off-by: lqw <616070323@qq.com>
This commit is contained in:
lqw
2022-08-15 08:10:36 +00:00
committed by Gitee
parent 869df87df0
commit bcc3f765a6
1 changed files with 5 additions and 5 deletions
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Atlas200DKSPILCD/fb_test_gradient.c
+5 -5
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@@ -24,7 +24,7 @@
#include <string.h>
#include <sys/ioctl.h>
struct g_fb_var_screeninfo vinfo = {0}; // 定义结构体变量，读取屏幕信息时用来记录屏幕可变信息的
struct fb_var_screeninfo g_vinfo = {0}; // 定义结构体变量，读取屏幕信息时用来记录屏幕可变信息的
unsigned char *g_fb_base; // 显存的基地址
unsigned int g_line_length;
unsigned int g_bytes_per_pixel; // 每像素占用字节数
@@ -52,15 +52,15 @@ int main(void)
return -1;
}
if (ioctl(fd_fb, FBIOGET_VSCREENINFO, &vinfo)) // 获取可变的参数g_fb_var_screeninfo的值
if (ioctl(fd_fb, FBIOGET_VSCREENINFO, &g_vinfo)) // 获取可变的参数fb_var_screeninfo的值
{
perror("ioctl");
return -1;
}
g_bytes_per_pixel = vinfo.bits_per_pixel / bits_per_byte;
g_line_length = vinfo.xres_virtual * g_bytes_per_pixel;
frame_buffer_size = vinfo.xres_virtual * vinfo.yres_virtual * g_bytes_per_pixel;
g_bytes_per_pixel = g_vinfo.bits_per_pixel / bits_per_byte;
g_line_length = g_vinfo.xres_virtual * g_bytes_per_pixel;
frame_buffer_size = g_vinfo.xres_virtual * g_vinfo.yres_virtual * g_bytes_per_pixel;
g_fb_base = (unsigned char *)mmap(NULL, frame_buffer_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd_fb, 0); // 通过mmap获取显存地址
if (g_fb_base == (unsigned char *)-1)