/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <time.h>
#include <linux/fb.h>
#include <linux/kd.h>
struct simple_fb {
void *data;
int width;
int height;
int stride;
int bpp;
};
static struct simple_fb gr_fbs[2];
static unsigned gr_active_fb = 0;
static int gr_fb_fd = -1;
static int gr_vt_fd = -1;
static struct fb_var_screeninfo vi;
struct fb_fix_screeninfo fi;
struct timespec tv, tv2;
static void dumpinfo(struct fb_fix_screeninfo *fi,
struct fb_var_screeninfo *vi);
static int get_framebuffer(struct simple_fb *fb, unsigned bpp)
{
int fd;
void *bits;
int bytes_per_pixel;
fd = open("/dev/graphics/fb0", O_RDWR);
if (fd < 0) {
printf("cannot open /dev/graphics/fb0, retrying with /dev/fb0\n");
if ((fd = open("/dev/fb0", O_RDWR)) < 0) {
perror("cannot open /dev/fb0");
return -1;
}
}
if(ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
perror("failed to get fb0 info");
return -1;
}
if (bpp && vi.bits_per_pixel != bpp) {
printf("bpp != %d, forcing...\n", bpp);
vi.bits_per_pixel = bpp;
if(ioctl(fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
perror("failed to force bpp");
return -1;
}
}
if(ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
perror("failed to get fb0 info");
return -1;
}
dumpinfo(&fi, &vi);
bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if(bits == MAP_FAILED) {
perror("failed to mmap framebuffer");
return -1;
}
bytes_per_pixel = vi.bits_per_pixel >> 3;
fb->width = vi.xres;
fb->height = vi.yres;
fb->stride = fi.line_length / bytes_per_pixel;
fb->data = bits;
fb->bpp = vi.bits_per_pixel;
fb++;
fb->width = vi.xres;
fb->height = vi.yres;
fb->stride = fi.line_length / bytes_per_pixel;
fb->data = (void *)((unsigned long)bits +
vi.yres * vi.xres * bytes_per_pixel);
fb->bpp = vi.bits_per_pixel;
return fd;
}
static void set_active_framebuffer(unsigned n)
{
if(n > 1) return;
vi.yres_virtual = vi.yres * 2;
vi.yoffset = n * vi.yres;
if(ioctl(gr_fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
fprintf(stderr,"active fb swap failed!\n");
} else
printf("active buffer: %d\n", n);
}
static void dumpinfo(struct fb_fix_screeninfo *fi, struct fb_var_screeninfo *vi)
{
fprintf(stderr,"vi.xres = %d\n", vi->xres);
fprintf(stderr,"vi.yres = %d\n", vi->yres);
fprintf(stderr,"vi.xresv = %d\n", vi->xres_virtual);
fprintf(stderr,"vi.yresv = %d\n", vi->yres_virtual);
fprintf(stderr,"vi.xoff = %d\n", vi->xoffset);
fprintf(stderr,"vi.yoff = %d\n", vi->yoffset);
fprintf(stderr, "vi.bits_per_pixel = %d\n", vi->bits_per_pixel);
fprintf(stderr, "fi.line_length = %d\n", fi->line_length);
}
int gr_init(int bpp, int id)
{
int fd = -1;
if (!access("/dev/tty0", F_OK)) {
fd = open("/dev/tty0", O_RDWR | O_SYNC);
if(fd < 0)
return -1;
if(ioctl(fd, KDSETMODE, (void*) KD_GRAPHICS)) {
close(fd);
return -1;
}
}
gr_fb_fd = get_framebuffer(gr_fbs, bpp);
if(gr_fb_fd < 0) {
if (fd >= 0) {
ioctl(fd, KDSETMODE, (void*) KD_TEXT);
close(fd);
}
return -1;
}
gr_vt_fd = fd;
/* start with 0 as front (displayed) and 1 as back (drawing) */
gr_active_fb = id;
set_active_framebuffer(id);
return 0;
}
void gr_exit(void)
{
close(gr_fb_fd);
gr_fb_fd = -1;
if (gr_vt_fd >= 0) {
ioctl(gr_vt_fd, KDSETMODE, (void*) KD_TEXT);
close(gr_vt_fd);
gr_vt_fd = -1;
}
}
int gr_fb_width(void)
{
return gr_fbs[0].width;
}
int gr_fb_height(void)
{
return gr_fbs[0].height;
}
uint16_t red = 0xf800;
uint16_t green = 0x07e0;
uint16_t blue = 0x001f;
uint16_t white = 0xffff;
uint16_t black = 0x0;
uint32_t red32 = 0x00ff0000;
uint32_t green32 = 0x0000ff00;
uint32_t blue32 = 0x000000ff;
uint32_t white32 = 0x00ffffff;
uint32_t black32 = 0x0;
void draw_grid(int w, int h, void* _loc) {
int i, j;
int v;
int stride = fi.line_length / (vi.bits_per_pixel >> 3);
uint16_t *loc = _loc;
uint32_t *loc32 = _loc;
for (j = 0; j < h/2; j++) {
for (i = 0; i < w/2; i++)
if (vi.bits_per_pixel == 16)
loc[i + j*(stride)] = red;
else
loc32[i + j*(stride)] = red32;
for (; i < w; i++)
if (vi.bits_per_pixel == 16)
loc[i + j*(stride)] = green;
else
loc32[i + j*(stride)] = green32;
}
for (; j < h; j++) {
for (i = 0; i < w/2; i++)
if (vi.bits_per_pixel == 16)
loc[i + j*(stride)] = blue;
else
loc32[i + j*(stride)] = blue32;
for (; i < w; i++)
if (vi.bits_per_pixel == 16)
loc[i + j*(stride)] = white;
else
loc32[i + j*(stride)] = white32;
}
}
void clear_screen(int w, int h, void* _loc)
{
int i,j;
int stride = fi.line_length / (vi.bits_per_pixel >> 3);
uint16_t *loc = _loc;
uint32_t *loc32 = _loc;
for (j = 0; j < h; j++)
for (i = 0; i < w; i++)
if (vi.bits_per_pixel == 16)
loc[i + j*(stride)] = black;
else
loc32[i + j*(stride)] = black32;
}
int main(int argc, char **argv) {
int w;
int h;
int id = 0;
int bpp = 0;
if (argc > 1)
bpp = atoi(argv[1]);
if (argc > 4)
id = !!atoi(argv[4]);
gr_init(bpp, id);
if (argc > 3) {
w = atoi(argv[2]);
h = atoi(argv[3]);
} else {
w = vi.xres;
h = vi.yres;
}
clear_screen(vi.xres, vi.yres, gr_fbs[0].data);
clear_screen(vi.xres, vi.yres, gr_fbs[1].data);
draw_grid(w, h, gr_fbs[id].data);
set_active_framebuffer(!id);
set_active_framebuffer(id);
return 0;
}