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displayio: area: add displayio_area_canon

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This routine will be used to simplify code that deals with ranges
of bitmap coordinates.
This commit is contained in:
Jeff Epler 2021-03-18 09:06:00 -05:00
parent f40c0c13ad
commit 3b506f0fa5
2 changed files with 14 additions and 0 deletions
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13
shared-module/displayio/__init__.c
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@ -320,6 +320,19 @@ bool displayio_area_empty(const displayio_area_t *a) {
return (a->x1 == a->x2) || (a->y1 == a->y2);
}
void displayio_area_canon(displayio_area_t *a) {
if (a->x1 < a->x2) {
int16_t t = a->x1;
a->x1 = a->x2;
a->x2 = t;
}
if (a->y1 < a->y2) {
int16_t t = a->y1;
a->y1 = a->y2;
a->y2 = t;
}
}
void displayio_area_union(const displayio_area_t *a,
const displayio_area_t *b,
displayio_area_t *u) {

1
shared-module/displayio/area.h
View File

@ -55,6 +55,7 @@ extern displayio_buffer_transform_t null_transform;
bool displayio_area_empty(const displayio_area_t *a);
void displayio_area_copy_coords(const displayio_area_t *src, displayio_area_t *dest);
void displayio_area_canon(displayio_area_t *a);
void displayio_area_union(const displayio_area_t *a,
const displayio_area_t *b,
displayio_area_t *u);