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/*
* V4L2 Codec decoding example application
* Kamil Debski <k.debski@samsung.com>
*
* Framebuffer operations
*
* Copyright 2012 Samsung Electronics Co., Ltd.
*
* 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 <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <linux/fb.h>
#include "common.h"
#include "fb.h"
int fb_open(struct instance *i, char *name)
{
struct fb_var_screeninfo fbinfo;
int ret;
i->fb.fd = open(name, O_RDWR);
if (i->fb.fd < 0) {
err("Failed to open frame buffer: %s", name);
return -1;
}
ret = ioctl(i->fb.fd, FBIOGET_VSCREENINFO, &fbinfo);
if (ret != 0) {
err("Failed to get frame buffer properties");
return -1;
}
dbg("Framebuffer properties: xres=%d, yres=%d, bpp=%d",
fbinfo.xres, fbinfo.yres, fbinfo.bits_per_pixel);
dbg("Virtual resolution: vxres=%d vyres=%d",
fbinfo.xres_virtual, fbinfo.yres_virtual);
i->fb.width = fbinfo.xres;
i->fb.height = fbinfo.yres;
i->fb.virt_width = fbinfo.xres_virtual;
i->fb.virt_height = fbinfo.yres_virtual;
i->fb.bpp = fbinfo.bits_per_pixel;
i->fb.stride = i->fb.virt_width * i->fb.bpp / 8;
i->fb.full_size = i->fb.stride * i->fb.virt_height;
i->fb.size = i->fb.stride * fbinfo.yres;
i->fb.p[0] = mmap(0, i->fb.full_size, PROT_WRITE | PROT_READ,
MAP_SHARED, i->fb.fd, 0);
i->fb.buffers = 1;
if (i->fb.double_buf) {
i->fb.p[1] = i->fb.p[0] + i->fb.size;
i->fb.buffers = 2;
}
return fb_set_virt_y_offset(i, 0);
}
int fb_set_virt_y_offset(struct instance *i, int yoffs)
{
struct fb_var_screeninfo var;
int ret;
ret = ioctl(i->fb.fd, FBIOGET_VSCREENINFO, &var);
if (ret != 0) {
err("Failed to get frame buffer screen information");
return -1;
}
var.yoffset = yoffs;
ret = ioctl(i->fb.fd, FBIOPAN_DISPLAY, &var);
if (ret != 0) {
err("Failed to set y_offset of frame buffer");
return -1;
}
return 0;
}
int fb_wait_for_vsync(struct instance *i)
{
int ret;
unsigned long temp;
ret = ioctl(i->fb.fd, FBIO_WAITFORVSYNC, &temp);
if (ret < 0) {
err("Wait for vsync failed");
return -1;
}
return 0;
}
void fb_close(struct instance *i)
{
fb_set_virt_y_offset(i, 0);
munmap(i->fb.p[0], i->fb.full_size);
close(i->fb.fd);
}
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