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// Very unfinished application that can view images and set the
// wallpaper. It only supports ppm3 and ppm6 files.
#include <assert.h>
#include <fcntl.h>
#include <libgui.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
GUI_Window *global_w;
struct PPM_IMAGE {
uint8_t version;
uint32_t width;
uint32_t height;
uint32_t maxval;
long file_location;
};
int parse_ppm_header(FILE *fp, struct PPM_IMAGE *img) {
char magic[3];
int width;
int height;
int maxval;
int v = 0;
char c1;
char c2;
for (; v < 3;) {
char c = fgetc(fp);
if ('#' != c) {
ungetc(c, fp);
if (0 == v) {
// TODO: Use %2s when scanf supports that
fscanf(fp, "%c%c", &c1, &c2);
}
if (1 == v) {
fscanf(fp, "%d %d", &width, &height);
}
if (2 == v) {
fscanf(fp, "%d", &maxval);
}
v++;
}
for (; '\n' != fgetc(fp);)
;
}
if ('P' != c1) {
printf("c1: %c\n", c1);
return 0;
}
if (!isdigit(c2)) {
printf("c2: %c\n", c2);
return 0;
}
img->version = c2 - '0';
if (3 != img->version && 6 != img->version) {
printf("Not handeld version\n");
return 0;
}
if (maxval > 255) {
printf("maxval is: %d\n", maxval);
return 0;
}
img->width = width;
img->height = height;
img->maxval = maxval;
img->file_location = ftell(fp);
return 1;
}
inline uint32_t low_32_reverse(uint32_t _value) {
return (((_value & 0x000000FF) << 24) | ((_value & 0x0000FF00) << 8) |
((_value & 0x00FF0000) >> 8));
}
int load_ppm6_file(FILE *fp, const struct PPM_IMAGE *img, uint32_t buf_width,
uint32_t buf_height, uint32_t *buffer) {
fseek(fp, img->file_location, SEEK_SET);
const uint8_t modifier = 255 / img->maxval;
int cx = 0;
int cy = 0;
const int n_pixels = img->width * img->height;
uint8_t *rgb = malloc(3 * n_pixels);
const int rc = fread(rgb, 3, n_pixels, fp);
if (0 == rc)
return 0;
uint32_t *p = rgb;
u32 buf_size = buf_height * buf_width;
if (1 == modifier) {
int c = 0;
for (int i = 0; i < rc && cy * buf_width + cx < buf_size; i++, c += 3) {
if (cx > buf_width) {
i--;
} else {
u8 red = rgb[c];
u8 green = rgb[c + 1];
u8 blue = rgb[c + 2];
buffer[cy * buf_width + cx] =
(red << (8 * 2)) | (green << (8 * 1)) | (blue << (8 * 0));
}
cx++;
if (cx == img->width) {
cx = 0;
cy++;
i--;
continue;
}
}
} else {
for (int i = 0; i < rc && cy * buf_width + cx < buf_size;
i++, p = ((uint8_t *)p) + 3) {
((uint8_t *)p)[0] *= modifier;
((uint8_t *)p)[1] *= modifier;
((uint8_t *)p)[2] *= modifier;
if (cx > buf_width) {
i--;
} else {
uint32_t v = *p;
buffer[cy * buf_width + cx] =
((v & 0xFF) << 16) | ((v & 0xFF00)) | ((v & 0xFF0000) >> 16);
}
cx++;
if (cx == img->width) {
cx = 0;
cy++;
i--;
continue;
}
}
}
return 1;
}
int load_ppm3_file(FILE *fp, const struct PPM_IMAGE *img, uint32_t buf_width,
uint32_t buf_height, uint32_t *buffer) {
fseek(fp, img->file_location, SEEK_SET);
uint8_t modifier = 255 / img->maxval;
int cx = 0;
int cy = 0;
for (int i = 0; i < img->width * img->height; i++) {
int red;
int green;
int blue;
int rc = fscanf(fp, "%d %d %d", &red, &green, &blue);
if (0 == rc)
break;
red &= 0xFF;
green &= 0xFF;
blue &= 0xFF;
red *= modifier;
green *= modifier;
blue *= modifier;
if (3 != rc) {
printf("not 3: %d\n", rc);
return 0;
}
buffer[cy * buf_width + cx] =
(red << 8 * 2) | (green << 8 * 1) | (blue << 8 * 0);
cx++;
if (cx == img->width) {
cx = 0;
cy++;
continue;
}
}
return 1;
}
int load_ppm_file(FILE *fp, const struct PPM_IMAGE *img, uint32_t buf_width,
uint32_t buf_height, uint32_t *buffer) {
if (3 == img->version)
return load_ppm3_file(fp, img, buf_width, buf_height, buffer);
else if (6 == img->version)
return load_ppm6_file(fp, img, buf_width, buf_height, buffer);
return 0;
}
struct DISPLAY_INFO {
uint32_t width;
uint32_t height;
uint8_t bpp;
};
int main(int argc, char **argv) {
if (argc < 2) {
printf("provide command line arguments dumbass\n");
return 1;
}
argv++;
int set_wallpaper = 0;
// Parse commandline arguments(shitty)
if (0 == strcmp(*argv, "-w")) {
set_wallpaper = 1;
argv++;
}
const char *file = *argv;
struct PPM_IMAGE img;
FILE *fp = fopen(file, "rb");
assert(fp);
assert(parse_ppm_header(fp, &img));
if (!set_wallpaper) {
global_w = GUI_CreateWindow(80, 80, img.width, img.height);
assert(global_w);
assert(
load_ppm_file(fp, &img, img.width, img.height, global_w->bitmap_ptr));
GUI_UpdateWindow(global_w);
fclose(fp);
GUI_EventLoop(global_w, NULL);
} else {
int wallpaper_fd;
do {
wallpaper_fd = shm_open("wallpaper", O_RDWR | O_CREAT, 0);
} while (-1 == wallpaper_fd);
struct DISPLAY_INFO inf;
int fd = open("/dev/display_info", O_READ, 0);
assert(fd >= 0);
assert(sizeof(inf) == read(fd, &inf, sizeof(inf)));
ftruncate(wallpaper_fd, inf.width * inf.height * sizeof(uint32_t));
void *rc = mmap(NULL, inf.width * inf.height * sizeof(uint32_t), 0, 0,
wallpaper_fd, 0);
assert(rc);
assert(load_ppm_file(fp, &img, inf.width, inf.height, rc));
close(fd);
}
return 0;
}
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