86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
/*
|
|
* helpers.cpp
|
|
* Pixel drawing helpers for Paint app
|
|
* Copyright (c) 2026 Daniel Hammer
|
|
*/
|
|
|
|
#include "paint.h"
|
|
|
|
void px_fill(uint32_t* px, int bw, int bh,
|
|
int x, int y, int w, int h, Color c) {
|
|
uint32_t v = c.to_pixel();
|
|
int x0 = x < 0 ? 0 : x, y0 = y < 0 ? 0 : y;
|
|
int x1 = x + w > bw ? bw : x + w;
|
|
int y1 = y + h > bh ? bh : y + h;
|
|
for (int row = y0; row < y1; row++)
|
|
for (int col = x0; col < x1; col++)
|
|
px[row * bw + col] = v;
|
|
}
|
|
|
|
void px_hline(uint32_t* px, int bw, int bh,
|
|
int x, int y, int w, Color c) {
|
|
if (y < 0 || y >= bh) return;
|
|
uint32_t v = c.to_pixel();
|
|
int x0 = x < 0 ? 0 : x;
|
|
int x1 = x + w > bw ? bw : x + w;
|
|
for (int col = x0; col < x1; col++)
|
|
px[y * bw + col] = v;
|
|
}
|
|
|
|
void px_vline(uint32_t* px, int bw, int bh,
|
|
int x, int y, int h, Color c) {
|
|
if (x < 0 || x >= bw) return;
|
|
uint32_t v = c.to_pixel();
|
|
int y0 = y < 0 ? 0 : y;
|
|
int y1 = y + h > bh ? bh : y + h;
|
|
for (int row = y0; row < y1; row++)
|
|
px[row * bw + x] = v;
|
|
}
|
|
|
|
void px_rect(uint32_t* px, int bw, int bh,
|
|
int x, int y, int w, int h, Color c) {
|
|
px_hline(px, bw, bh, x, y, w, c);
|
|
px_hline(px, bw, bh, x, y + h - 1, w, c);
|
|
px_vline(px, bw, bh, x, y, h, c);
|
|
px_vline(px, bw, bh, x + w - 1, y, h, c);
|
|
}
|
|
|
|
void px_fill_rounded(uint32_t* px, int bw, int bh,
|
|
int x, int y, int w, int h, int r, Color c) {
|
|
uint32_t v = c.to_pixel();
|
|
for (int row = 0; row < h; row++) {
|
|
int py = y + row;
|
|
if (py < 0 || py >= bh) continue;
|
|
int inset = 0;
|
|
if (row < r) {
|
|
int dy = r - 1 - row;
|
|
if (r == 3) {
|
|
if (dy >= 2) inset = 2;
|
|
else if (dy >= 1) inset = 1;
|
|
} else {
|
|
for (int i = r; i > 0; i--) {
|
|
int dx = r - i;
|
|
if (dx * dx + dy * dy < r * r) { inset = i; break; }
|
|
}
|
|
}
|
|
} else if (row >= h - r) {
|
|
int dy = row - (h - r);
|
|
if (r == 3) {
|
|
if (dy >= 2) inset = 2;
|
|
else if (dy >= 1) inset = 1;
|
|
} else {
|
|
for (int i = r; i > 0; i--) {
|
|
int dx = r - i;
|
|
if (dx * dx + dy * dy < r * r) { inset = i; break; }
|
|
}
|
|
}
|
|
}
|
|
int x0 = x + inset;
|
|
int x1 = x + w - inset;
|
|
if (x0 < 0) x0 = 0;
|
|
if (x1 > bw) x1 = bw;
|
|
for (int col = x0; col < x1; col++)
|
|
px[py * bw + col] = v;
|
|
}
|
|
}
|