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examples: draw: Draw a larget dot

pull/30/head
Andri Yngvason 2020-04-08 22:58:14 +00:00
parent 77b866096d
commit ee2adedfd1
2 changed files with 48 additions and 11 deletions
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58
examples/draw.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2019 Andri Yngvason
* Copyright (c) 2019 - 2020 Andri Yngvason
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -18,21 +18,64 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <tgmath.h>
#include <aml.h>
#include <signal.h>
#include <assert.h>
#include <pixman.h>
#include <sys/param.h>
#include <libdrm/drm_fourcc.h>
#define MAX_COORD 128
struct coord {
int x, y;
};
struct draw {
struct nvnc_fb* fb;
struct { uint16_t x, y; } coord[MAX_COORD];
struct coord coord[MAX_COORD];
int index;
};
int coord_distance_between(struct coord a, struct coord b)
{
float x = abs(a.x - b.x);
float y = abs(a.y - b.y);
return round(sqrt(x * x + y * y));
}
void draw_dot(struct nvnc* nvnc, struct nvnc_fb* fb, struct coord coord,
int radius, uint32_t colour)
{
uint32_t* image = nvnc_fb_get_addr(fb);
int width = nvnc_fb_get_width(fb);
int height = nvnc_fb_get_height(fb);
struct coord start, stop;
start.x = MAX(0, coord.x - radius);
start.y = MAX(0, coord.y - radius);
stop.x = MIN(width, coord.x + radius);
stop.y = MIN(height, coord.y + radius);
struct pixman_region16 region;
pixman_region_init_rect(&region, start.x, start.y,
stop.x - start.x, stop.y - start.y);
nvnc_damage_region(nvnc, &region);
pixman_region_fini(&region);
/* The brute force method. ;) */
for (int y = start.y; y < stop.y; ++y)
for (int x = start.x; x < stop.x; ++x) {
struct coord point = { .x = x, .y = y };
if (coord_distance_between(point, coord) <= radius)
image[x + y * width] = colour;
}
}
void on_pointer_event(struct nvnc_client* client, uint16_t x, uint16_t y,
enum nvnc_button_mask buttons)
{
@ -67,15 +110,8 @@ void on_render(struct nvnc* server, struct nvnc_fb* fb)
struct draw* draw = nvnc_get_userdata(server);
assert(draw);
uint32_t* image = nvnc_fb_get_addr(draw->fb);
int width = nvnc_fb_get_width(draw->fb);
for (int i = 0; i < draw->index; ++i) {
uint16_t x = draw->coord[i].x;
uint16_t y = draw->coord[i].y;
image[x + y * width] = 0;
}
for (int i = 0; i < draw->index; ++i)
draw_dot(server, fb, draw->coord[i], 16, 0);
draw->index = 0;
}

1
examples/meson.build
View File

@ -9,6 +9,7 @@ executable(
neatvnc_dep,
pixman,
aml,
libm,
]
)