/****************************************************************************
* apps/examples/fb/fb_main.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <nuttx/video/fb.h>
#include <nuttx/video/rgbcolors.h>
/****************************************************************************
* Preprocessor Definitions
****************************************************************************/
#define NCOLORS 6
/****************************************************************************
* Private Types
****************************************************************************/
struct fb_state_s
{
int fd;
struct fb_videoinfo_s vinfo;
struct fb_planeinfo_s pinfo;
#ifdef CONFIG_FB_OVERLAY
struct fb_overlayinfo_s oinfo;
#endif
FAR void *fbmem;
};
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_default_fbdev[] = CONFIG_EXAMPLES_FB_DEFAULTFB;
/* Violet-Blue-Green-Yellow-Orange-Red */
static const uint32_t g_rgb24[NCOLORS] =
{
RGB24_VIOLET, RGB24_BLUE, RGB24_GREEN,
RGB24_YELLOW, RGB24_ORANGE, RGB24_RED
};
static const uint16_t g_rgb16[NCOLORS] =
{
RGB16_VIOLET, RGB16_BLUE, RGB16_GREEN,
RGB16_YELLOW, RGB16_ORANGE, RGB16_RED
};
static const uint8_t g_rgb8[NCOLORS] =
{
RGB8_VIOLET, RGB8_BLUE, RGB8_GREEN,
RGB8_YELLOW, RGB8_ORANGE, RGB8_RED
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* draw_rect
****************************************************************************/
static void draw_rect32(FAR struct fb_state_s *state,
FAR struct fb_area_s *area, int color)
{
FAR uint32_t *dest;
FAR uint8_t *row;
int x;
int y;
row = (FAR uint8_t *)state->fbmem + state->pinfo.stride * area->y;
for (y = 0; y < area->h; y++)
{
dest = ((FAR uint32_t *)row) + area->x;
for (x = 0; x < area->w; x++)
{
*dest++ = g_rgb24[color];
}
row += state->pinfo.stride;
}
}
static void draw_rect16(FAR struct fb_state_s *state,
FAR struct fb_area_s *area, int color)
{
FAR uint16_t *dest;
FAR uint8_t *row;
int x;
int y;
row = (FAR uint8_t *)state->fbmem + state->pinfo.stride * area->y;
for (y = 0; y < area->h; y++)
{
dest = ((FAR uint16_t *)row) + area->x;
for (x = 0; x < area->w; x++)
{
*dest++ = g_rgb16[color];
}
row += state->pinfo.stride;
}
}
static void draw_rect8(FAR struct fb_state_s *state,
FAR struct fb_area_s *area, int color)
{
FAR uint8_t *dest;
FAR uint8_t *row;
int x;
int y;
row = (FAR uint8_t *)state->fbmem + state->pinfo.stride * area->y;
for (y = 0; y < area->h; y++)
{
dest = row + area->x;
for (x = 0; x < area->w; x++)
{
*dest++ = g_rgb8[color];
}
row += state->pinfo.stride;
}
}
static void draw_rect1(FAR struct fb_state_s *state,
FAR struct fb_area_s *area, int color)
{
FAR uint8_t *pixel;
FAR uint8_t *row;
uint8_t color8 = (color & 1) == 0 ? 0 : 0xff;
int start_full_x;
int end_full_x;
int start_bit_shift;
int last_bits;
uint8_t lmask;
uint8_t rmask;
int y;
/* Calculate the framebuffer address of the first row to draw on */
row = (FAR uint8_t *)state->fbmem + state->pinfo.stride * area->y;
/* Calculate the position of the first complete (with all bits) byte.
* Then calculate the last byte with all the bits.
*/
start_full_x = ((area->x + 7) >> 3);
end_full_x = ((area->x + area->w) >> 3);
/* Calculate the number of bits in byte before start that need to remain
* unchanged. Later calculate the mask.
*/
start_bit_shift = 8 + area->x - (start_full_x << 3);
lmask = 0xff >> start_bit_shift;
/* Calculate the number of bits that needs to be changed after last byte
* with all the bits. Later calculate the mask.
*/
last_bits = area->x + area->w - (end_full_x << 3);
rmask = 0xff << (8 - last_bits);
/* Calculate a mask on the first and last bytes of the sequence that may
* not be completely filled with pixel.
*/
/* Now draw each row, one-at-a-time */
for (y = 0; y < area->h; y++)
{
/* 'pixel' points to the 1st pixel the next row */
/* Special case: The row starts and ends within the same byte */
if (start_full_x > end_full_x)
{
pixel = row + start_full_x - 1;
*pixel = (*pixel & (~lmask | ~rmask)) | (lmask & rmask & color8);
continue;
}
if (start_bit_shift != 0)
{
pixel = row + start_full_x - 1;
*pixel = (*pixel & ~lmask) | (lmask & color8);
}
if (end_full_x > start_full_x)
{
pixel = row + start_full_x;
memset(pixel, color8, end_full_x - start_full_x);
}
if (last_bits != 0)
{
pixel = row + end_full_x;
*pixel = (*pixel & ~rmask) | (rmask & color8);
}
row += state->pinfo.stride;
}
}
static void draw_rect(FAR struct fb_state_s *state,
FAR struct fb_area_s *area, int color)
{
#ifdef CONFIG_FB_UPDATE
int ret;
#endif
switch (state->pinfo.bpp)
{
case 32:
draw_rect32(state, area, color);
break;
case 16:
draw_rect16(state, area, color);
break;
case 8:
default:
draw_rect8(state, area, color);
break;
case 1:
draw_rect1(state, area, color);
break;
}
#ifdef CONFIG_FB_UPDATE
ret = ioctl(state->fd, FBIO_UPDATE,
(unsigned long)((uintptr_t)area));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: ioctl(FBIO_UPDATE) failed: %d\n",
errcode);
}
#endif
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* fb_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
FAR const char *fbdev = g_default_fbdev;
struct fb_state_s state;
struct fb_area_s area;
int nsteps;
int xstep;
int ystep;
int width;
int height;
int color;
int x;
int y;
int ret;
/* There is a single required argument: The path to the framebuffer
* driver.
*/
if (argc == 2)
{
fbdev = argv[1];
}
else if (argc != 1)
{
fprintf(stderr, "ERROR: Single argument required\n");
fprintf(stderr, "USAGE: %s [<fb-driver-path>]\n", argv[0]);
return EXIT_FAILURE;
}
/* Open the framebuffer driver */
state.fd = open(fbdev, O_RDWR);
if (state.fd < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to open %s: %d\n", fbdev, errcode);
return EXIT_FAILURE;
}
/* Get the characteristics of the framebuffer */
ret = ioctl(state.fd, FBIOGET_VIDEOINFO,
(unsigned long)((uintptr_t)&state.vinfo));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: ioctl(FBIOGET_VIDEOINFO) failed: %d\n",
errcode);
close(state.fd);
return EXIT_FAILURE;
}
printf("VideoInfo:\n");
printf(" fmt: %u\n", state.vinfo.fmt);
printf(" xres: %u\n", state.vinfo.xres);
printf(" yres: %u\n", state.vinfo.yres);
printf(" nplanes: %u\n", state.vinfo.nplanes);
#ifdef CONFIG_FB_OVERLAY
printf("noverlays: %u\n", state.vinfo.noverlays);
/* Select the first overlay, which should be the composed framebuffer */
ret = ioctl(state.fd, FBIO_SELECT_OVERLAY, 0);
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: ioctl(FBIO_SELECT_OVERLAY) failed: %d\n",
errcode);
close(state.fd);
return EXIT_FAILURE;
}
/* Get the first overlay information */
state.oinfo.overlay = 0;
ret = ioctl(state.fd, FBIOGET_OVERLAYINFO,
(unsigned long)((uintptr_t)&state.oinfo));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: ioctl(FBIOGET_OVERLAYINFO) failed: %d\n",
errcode);
close(state.fd);
return EXIT_FAILURE;
}
printf("OverlayInfo (overlay 0):\n");
printf(" fbmem: %p\n", state.oinfo.fbmem);
printf(" fblen: %lu\n", (unsigned long)state.oinfo.fblen);
printf(" stride: %u\n", state.oinfo.stride);
printf(" overlay: %u\n", state.oinfo.overlay);
printf(" bpp: %u\n", state.oinfo.bpp);
printf(" blank: %u\n", state.oinfo.blank);
printf("chromakey: 0x%08" PRIx32 "\n", state.oinfo.chromakey);
printf(" color: 0x%08" PRIx32 "\n", state.oinfo.color);
printf(" transp: 0x%02x\n", state.oinfo.transp.transp);
printf(" mode: %u\n", state.oinfo.transp.transp_mode);
printf(" area: (%u,%u) => (%u,%u)\n",
state.oinfo.sarea.x, state.oinfo.sarea.y,
state.oinfo.sarea.w, state.oinfo.sarea.h);
printf(" accl: %" PRIu32 "\n", state.oinfo.accl);
#endif
ret = ioctl(state.fd, FBIOGET_PLANEINFO,
(unsigned long)((uintptr_t)&state.pinfo));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: ioctl(FBIOGET_PLANEINFO) failed: %d\n",
errcode);
close(state.fd);
return EXIT_FAILURE;
}
printf("PlaneInfo (plane 0):\n");
printf(" fbmem: %p\n", state.pinfo.fbmem);
printf(" fblen: %lu\n", (unsigned long)state.pinfo.fblen);
printf(" stride: %u\n", state.pinfo.stride);
printf(" display: %u\n", state.pinfo.display);
printf(" bpp: %u\n", state.pinfo.bpp);
/* Only these pixel depths are supported. viinfo.fmt is ignored, only
* certain color formats are supported.
*/
if (state.pinfo.bpp != 32 && state.pinfo.bpp != 16 &&
state.pinfo.bpp != 8 && state.pinfo.bpp != 1)
{
fprintf(stderr, "ERROR: bpp=%u not supported\n", state.pinfo.bpp);
close(state.fd);
return EXIT_FAILURE;
}
/* mmap() the framebuffer.
*
* NOTE: In the FLAT build the frame buffer address returned by the
* FBIOGET_PLANEINFO IOCTL command will be the same as the framebuffer
* address. mmap(), however, is the preferred way to get the framebuffer
* address because in the KERNEL build, it will perform the necessary
* address mapping to make the memory accessible to the application.
*/
state.fbmem = mmap(NULL, state.pinfo.fblen, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FILE, state.fd, 0);
if (state.fbmem == MAP_FAILED)
{
int errcode = errno;
fprintf(stderr, "ERROR: ioctl(FBIOGET_PLANEINFO) failed: %d\n",
errcode);
close(state.fd);
return EXIT_FAILURE;
}
printf("Mapped FB: %p\n", state.fbmem);
/* Draw some rectangles */
nsteps = 2 * (NCOLORS - 1) + 1;
xstep = state.vinfo.xres / nsteps;
ystep = state.vinfo.yres / nsteps;
width = state.vinfo.xres;
height = state.vinfo.yres;
for (x = 0, y = 0, color = 0;
color < NCOLORS;
x += xstep, y += ystep, color++)
{
area.x = x;
area.y = y;
area.w = width;
area.h = height;
printf("%2d: (%3d,%3d) (%3d,%3d)\n",
color, area.x, area.y, area.w, area.h);
draw_rect(&state, &area, color);
usleep(500 * 1000);
width -= (2 * xstep);
height -= (2 * ystep);
}
printf("Test finished\n");
munmap(state.fbmem, state.pinfo.fblen);
close(state.fd);
return EXIT_SUCCESS;
}