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fix two off by one errors

This commit is contained in:
Kevin Matocha 2021-02-26 17:22:11 -06:00
parent 4097c949a3
commit 3afc269b18
1 changed files with 4 additions and 4 deletions
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8
shared-module/displayio/Bitmap.c
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@ -130,14 +130,14 @@ void common_hal_displayio_bitmap_blit(displayio_bitmap_t *self, int16_t x, int16
// simplest version - use internal functions for get/set pixels // simplest version - use internal functions for get/set pixels
for (int16_t i=0; i < (x2-x1); i++) { for (int16_t i=0; i < (x2-x1); i++) {
const int xs_index = x_reverse ? ( (x2 - 1) - i ) : x1+i; // x-index into the source bitmap const int xs_index = x_reverse ? ( (x2) - i - 1) : x1+i; // x-index into the source bitmap
const int xd_index = x_reverse ? ((x + (x2-x1)) - i ) : x+i; // x-index into the destination bitmap const int xd_index = x_reverse ? ((x + (x2-x1)) - i - 1) : x+i; // x-index into the destination bitmap
if ( (xd_index >= 0) && (xd_index < self->width) ) { if ( (xd_index >= 0) && (xd_index < self->width) ) {
for (int16_t j=0; j < (y2-y1) ; j++){ for (int16_t j=0; j < (y2-y1) ; j++){
const int ys_index = y_reverse ? ( (y2 - 1) - j ) : y1+j ; // y-index into the source bitmap const int ys_index = y_reverse ? ( (y2 ) - j - 1) : y1+j ; // y-index into the source bitmap
const int yd_index = y_reverse ? ((y + (y2-y1)) - j ) : y+j ; // y-index into the destination bitmap const int yd_index = y_reverse ? ((y + (y2-y1)) - j - 1) : y+j ; // y-index into the destination bitmap
if ((yd_index >= 0) && (yd_index < self->height) ) { if ((yd_index >= 0) && (yd_index < self->height) ) {
uint32_t value = common_hal_displayio_bitmap_get_pixel(source, xs_index, ys_index); uint32_t value = common_hal_displayio_bitmap_get_pixel(source, xs_index, ys_index);