diff options
Diffstat (limited to 'src/framebuffer.c')
| -rw-r--r-- | src/framebuffer.c | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/src/framebuffer.c b/src/framebuffer.c deleted file mode 100644 index 55964d2..0000000 --- a/src/framebuffer.c +++ /dev/null @@ -1,215 +0,0 @@ -/** - * crt-calibrator – Calibration utility for CRT monitors - * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ -#include "framebuffer.h" - -#include <unistd.h> -#include <stdio.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <sys/mman.h> -#include <stropts.h> -#include <linux/fb.h> -#include <errno.h> - - -/** - * The psuedodevice pathname pattern used to access a framebuffer - */ -#ifndef FB_DEVICE_PATTERN -# define FB_DEVICE_PATTERN "/dev/fb%lu" -#endif - - -/** - * The number of elements to allocates to a buffer for a framebuffer device pathname - */ -#define FB_DEVICE_MAX_LEN (sizeof(FB_DEVICE_PATTERN) / sizeof(char) + 3 * sizeof(size_t)) - - - -/** - * Figure out how many framebuffers there are on the system - * - * @return The number of framebuffers on the system - */ -size_t fb_count(void) -{ - char buf[FB_DEVICE_MAX_LEN]; - size_t count = 0; - - for (;; count++) - { - sprintf(buf, FB_DEVICE_PATTERN, count); - if (access(buf, F_OK) < 0) - return count; - } -} - - -/** - * Open a framebuffer - * - * @param index The index of the framebuffer to open - * @param fb Framebuffer information to fill in - * @return Zero on success, -1 on error - */ -int fb_open(size_t index, framebuffer_t* restrict fb) -{ - char buf[FB_DEVICE_MAX_LEN]; - struct fb_fix_screeninfo fix_info; - struct fb_var_screeninfo var_info; - int old_errno; - - fb->fd = -1; - fb->mem = MAP_FAILED; - - sprintf(buf, FB_DEVICE_PATTERN, index); - fb->fd = open(buf, O_RDWR); - if (fb->fd == -1) - goto fail; - - if (ioctl(fb->fd, (unsigned long int)FBIOGET_FSCREENINFO, &fix_info) || - ioctl(fb->fd, (unsigned long int)FBIOGET_VSCREENINFO, &var_info)) - goto fail; - - fb->mem = mmap(NULL, (size_t)(fix_info.smem_len), PROT_WRITE, MAP_SHARED, fb->fd, (off_t)0); - if (fb->mem == MAP_FAILED) - goto fail; - - fb->mem += var_info.xoffset * (var_info.bits_per_pixel / 8); - fb->mem += var_info.yoffset * fix_info.line_length; - - fb->width = var_info.xres; - fb->height = var_info.yres; - fb->bytes_per_pixel = var_info.bits_per_pixel / 8; - fb->line_length = fix_info.line_length; - - return 0; - fail: - old_errno = errno; - fb_close(fb); - errno = old_errno; - return -1; -} - - -/** - * Close a framebuffer - * - * @param fb The framebuffer information - */ -void fb_close(framebuffer_t* restrict fb) -{ - if (fb->fd != -1) - close(fb->fd), fb->fd = -1; -} - - -/** - * Construct an sRGB colour in 32-bit XRGB encoding to - * use when specifying colours - * - * @param red The red component from [0, 255] sRGB - * @param green The green component from [0, 255] sRGB - * @param blue The blue component from [0, 255] sRGB - * @return The colour as one 32-bit integer - */ -uint32_t fb_colour(int red, int green, int blue) -{ - uint32_t rc = 0; - rc |= (uint32_t)red, rc <<= 8; - rc |= (uint32_t)green, rc <<= 8; - rc |= (uint32_t)blue; - return rc; -} - - -/** - * Print a filled in rectangle to a framebuffer - * - * @param fb The framebuffer - * @param colour The colour to use when drawing the rectangle - * @param x The starting pixel on the X axis for the rectangle - * @param y The starting pixel on the Y axis for the rectangle - * @param width The width of the rectangle, in pixels - * @param height The height of the rectangle, in pixels - */ -void fb_fill_rectangle(framebuffer_t* restrict fb, uint32_t colour, - uint32_t x, uint32_t y, uint32_t width, uint32_t height) -{ - int8_t* mem = fb->mem + y * fb->line_length; - size_t x1 = x * fb->bytes_per_pixel; - size_t x2 = (x + width) * fb->bytes_per_pixel; - size_t y2 = y + height; - size_t x_, y_; - - for (y_ = y; y_ != y2; y_++, mem += fb->line_length) - for (x_ = x1; x_ != x2; x_ += fb->bytes_per_pixel) - { - int8_t* pixel = mem + x_; - *(uint32_t*)pixel = colour; - } -} - - -/** - * Draw a horizontal line segment on a framebuffer - * - * @param fb The framebuffer - * @param colour The colour to use when drawing the rectangle - * @param x The starting pixel on the X axis for the line segment - * @param y The starting pixel on the Y axis for the line segment - * @param length The length of the line segment, in pixels - */ -void fb_draw_horizontal_line(framebuffer_t* restrict fb, uint32_t colour, - uint32_t x, uint32_t y, uint32_t length) -{ - int8_t* mem = fb->mem + y * fb->line_length; - size_t x1 = x * fb->bytes_per_pixel; - size_t x2 = (x + length) * fb->bytes_per_pixel; - size_t x_; - - for (x_ = x1; x_ != x2; x_ += fb->bytes_per_pixel) - { - int8_t* pixel = mem + x_; - *(uint32_t*)pixel = colour; - } -} - - -/** - * Draw a vertical line segment on a framebuffer - * - * @param fb The framebuffer - * @param colour The colour to use when drawing the rectangle - * @param x The starting pixel on the X axis for the line segment - * @param y The starting pixel on the Y axis for the line segment - * @param length The length of the line segment, in pixels - */ -void fb_draw_vertical_line(framebuffer_t* restrict fb, uint32_t colour, - uint32_t x, uint32_t y, uint32_t length) -{ - int8_t* mem = fb->mem + y * fb->line_length + x * fb->bytes_per_pixel; - size_t y2 = y + length; - size_t y_; - - for (y_ = y; y_ != y2; y_++, mem += fb->line_length) - *(uint32_t*)mem = colour; -} - |