djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Handle -scale to 0 correctly in Group

Browse Source 
Fixes #1839
This commit is contained in:
Scott Shawcroft 2019-05-09 11:38:30 -07:00
parent 9ce042ad07
commit e64bbc41ec
No known key found for this signature in database
GPG Key ID: FD0EDC4B6C53CA59
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
shared-module/displayio/Group.c
View File

@ -128,6 +128,14 @@ void displayio_group_construct(displayio_group_t* self, displayio_group_child_t*
bool displayio_group_get_pixel(displayio_group_t *self, int16_t x, int16_t y, uint16_t* pixel) {
x -= self->x;
y -= self->y;
// When we are scaled we need to substract all but one to ensure -scale to 0 divide down to -1.
// Normally -scale to scale both divide down to 0 because 0 is unsigned.
if (x < 0) {
x -= self->scale - 1;
}
if (y < 0) {
y -= self->scale - 1;
}
x /= self->scale;
y /= self->scale;
for (int32_t i = self->size - 1; i >= 0 ; i--) {