From 16ffc731f3c64b36a486a27d87b10742cf5bb4ba Mon Sep 17 00:00:00 2001 From: George Waters Date: Thu, 21 May 2020 21:57:45 -0400 Subject: Implement negative step for pixelbuf slices --- shared-module/_pixelbuf/PixelBuf.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'shared-module/_pixelbuf') diff --git a/shared-module/_pixelbuf/PixelBuf.c b/shared-module/_pixelbuf/PixelBuf.c index 31350b875..c32544483 100644 --- a/shared-module/_pixelbuf/PixelBuf.c +++ b/shared-module/_pixelbuf/PixelBuf.c @@ -216,12 +216,19 @@ void _pixelbuf_set_pixel(pixelbuf_pixelbuf_obj_t* self, size_t index, mp_obj_t v _pixelbuf_set_pixel_color(self, index, r, g, b, w); } -void common_hal__pixelbuf_pixelbuf_set_pixels(mp_obj_t self_in, size_t start, size_t stop, size_t step, mp_obj_t* values) { +void common_hal__pixelbuf_pixelbuf_set_pixels(mp_obj_t self_in, size_t start, size_t stop, mp_int_t step, mp_obj_t* values) { pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in); size_t source_i = 0; - for (size_t target_i = start; target_i < stop; target_i += step) { - _pixelbuf_set_pixel(self, target_i, values[source_i]); - source_i++; + if (step > 0) { + for (size_t target_i = start; target_i < stop; target_i += step) { + _pixelbuf_set_pixel(self, target_i, values[source_i]); + source_i++; + } + }else{ + for (size_t target_i = start; target_i >= stop; target_i += step) { + _pixelbuf_set_pixel(self, target_i, values[source_i]); + source_i++; + } } if (self->auto_write) { common_hal__pixelbuf_pixelbuf_show(self_in); -- cgit v1.2.3