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Framebuffer Test
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| #include <linux/fb.h> | |
| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <sys/types.h> | |
| #include <sys/stat.h> | |
| #include <fcntl.h> | |
| #include <errno.h> | |
| #include <string.h> | |
| #include <time.h> | |
| #include <sys/mman.h> | |
| const char *FB_NAME = "/dev/fb0"; | |
| void *m_FrameBuffer; | |
| struct fb_fix_screeninfo m_FixInfo; | |
| struct fb_var_screeninfo m_VarInfo; | |
| int m_FBFD; | |
| int main(int argc, char *argv[]) | |
| { | |
| int iFrameBufferSize; | |
| /* | |
| * Open the framebuffer device in read write | |
| */ | |
| m_FBFD = open(FB_NAME, O_RDWR); | |
| if (m_FBFD < 0) { | |
| printf("Unable to open %s.\n", FB_NAME); | |
| return 1; | |
| } | |
| /* | |
| * Do Ioctl. Retrieve fixed screen info. | |
| */ | |
| if (ioctl(m_FBFD, FBIOGET_FSCREENINFO, &m_FixInfo) < 0) { | |
| printf("get fixed screen info failed: %s\n", strerror(errno)); | |
| close(m_FBFD); | |
| return 1; | |
| } | |
| /* | |
| * Do Ioctl. Get the variable screen info. | |
| */ | |
| if (ioctl(m_FBFD, FBIOGET_VSCREENINFO, &m_VarInfo) < 0) { | |
| printf("Unable to retrieve variable screen info: %s\n", strerror(errno)); | |
| close(m_FBFD); | |
| return 1; | |
| } | |
| /* | |
| * Calculate the size to mmap | |
| */ | |
| iFrameBufferSize = m_FixInfo.line_length * m_VarInfo.yres; | |
| printf("Line length %d\n", m_FixInfo.line_length); | |
| /* | |
| * Now mmap the framebuffer. | |
| */ | |
| m_FrameBuffer = mmap(NULL, iFrameBufferSize, PROT_READ | PROT_WRITE, MAP_SHARED, m_FBFD, 0); | |
| if (m_FrameBuffer == NULL) { | |
| printf("mmap failed:\n"); | |
| close(m_FBFD); | |
| return 1; | |
| } | |
| if (1) { | |
| int *p = (int *) m_FrameBuffer; | |
| int x, y, t = 0; | |
| int times = 100; | |
| clock_t cend = 0; | |
| clock_t cstart = clock(); | |
| while (times--) { | |
| for (y = 0; y < m_VarInfo.yres; y++) { | |
| for (x = 0; x < m_VarInfo.xres; x++) { | |
| p[x + y * m_VarInfo.xres] = 0x00100 * y + x + t; | |
| } | |
| } | |
| t++; | |
| } | |
| cend = clock(); | |
| printf("%.3f cpu secs\n", ((double)cend - (double)cstart) * 1.0e-6); | |
| } | |
| return 0; | |
| } |
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