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box-drawing: {h,v}line: implement using pixman

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Use pixman_image_fill_rectangles() to render horizontal and vertical
lines.

Despite the name, this *is* the appropriate function to use, since our
lines *do* have a thickness, and thus *are* rectangles.
This commit is contained in:
Daniel Eklöf 2021-05-05 15:01:57 +02:00
parent e03257d342
commit 155537c2de
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GPG key ID: 5BBD4992C116573F
1 changed files with 20 additions and 14 deletions
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34
box-drawing.c
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@ -29,6 +29,8 @@ struct buf {
float base_thickness; float base_thickness;
}; };
static const pixman_color_t white = {0xffff, 0xffff, 0xffff, 0xffff};
static int static int
_thickness(struct buf *buf, enum thickness thick) _thickness(struct buf *buf, enum thickness thick)
{ {
@ -42,13 +44,15 @@ _hline(struct buf *buf, int x1, int x2, int y, int thick)
x1 = min(max(x1, 0), buf->width); x1 = min(max(x1, 0), buf->width);
x2 = min(max(x2, 0), buf->width); x2 = min(max(x2, 0), buf->width);
for (size_t row = max(y, 0); row < max(min(y + thick, buf->height), 0); row++) { int y1 = max(y, 0);
for (size_t col = x1; col < x2; col++) { int y2 = min(max(y + thick, 0), buf->height);
size_t idx = col / 8; int width = x2 - x1;
size_t bit_no = col % 8; int height = y2 - y1;
buf->data[row * buf->stride + idx] |= 1 << bit_no;
} pixman_rectangle16_t rect = {
} .x = x1, .y = y1, .width = width, .height = height};
pixman_image_fill_rectangles(PIXMAN_OP_SRC, buf->pix, &white, 1, &rect);
} }
#define hline(x1, x2, y, thick) _hline(buf, x1, x2, y, thick) #define hline(x1, x2, y, thick) _hline(buf, x1, x2, y, thick)
@ -59,13 +63,15 @@ _vline(struct buf *buf, int y1, int y2, int x, int thick)
y1 = min(max(y1, 0), buf->height); y1 = min(max(y1, 0), buf->height);
y2 = min(max(y2, 0), buf->height); y2 = min(max(y2, 0), buf->height);
for (size_t row = y1; row < y2; row++) { int x1 = max(x, 0);
for (size_t col = max(x, 0); col < max(min(x + thick, buf->width), 0); col++) { int x2 = min(max(x + thick, 0), buf->width);
size_t idx = col / 8; int width = x2 - x1;
size_t bit_no = col % 8; int height = y2 - y1;
buf->data[row * buf->stride + idx] |= 1 << bit_no;
} pixman_rectangle16_t rect = {
} .x = x1, .y = y1, .width = width, .height = height};
pixman_image_fill_rectangles(PIXMAN_OP_SRC, buf->pix, &white, 1, &rect);
} }
#define vline(y1, y2, x, thick) _vline(buf, y1, y2, x, thick) #define vline(y1, y2, x, thick) _vline(buf, y1, y2, x, thick)