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fix(draw): fix the calculation of the transformed coordinates

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fixes https://forum.lvgl.io/t/inaccurate-bitmap-zoom/8858
This commit is contained in:
Gabor Kiss-Vamosi 2022-05-11 22:04:03 +02:00
parent 67446a4922
commit 76de7c6b7b
2 changed files with 6 additions and 6 deletions
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6
src/draw/lv_img_buf.c
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@ -434,9 +434,9 @@ void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t
lv_point_t p[4] = {
{0, 0},
{w - 1, 0},
{0, h - 1},
{w - 1, h - 1},
{w, 0},
{0, h},
{w, h},
};
lv_point_transform(&p[0], angle, zoom, pivot);
lv_point_transform(&p[1], angle, zoom, pivot);

6
src/draw/sw/lv_draw_sw_transform.c
View File

@ -122,8 +122,8 @@ void lv_draw_sw_transform(lv_draw_ctx_t * draw_ctx, const lv_area_t * dest_area,
xs_step_256 = (256 * xs_diff) / (dest_w - 1);
ys_step_256 = (256 * ys_diff) / (dest_w - 1);
}
int32_t xs_ups = xs1_ups + 1 * xs_step_256 / 2 / 256; /*Init. + go the center of the pixel*/
int32_t ys_ups = ys1_ups + 1 * ys_step_256 / 2 / 256;
int32_t xs_ups = xs1_ups;
int32_t ys_ups = ys1_ups;
if(draw_dsc->antialias == 0) {
switch(cf) {
@ -176,7 +176,7 @@ static void rgb_no_aa(const uint8_t * src, lv_coord_t src_w, lv_coord_t src_h, l
int32_t xs_int = xs_ups >> 8;
int32_t ys_int = ys_ups >> 8;
if(xs_int < 0 || xs_int >= src_w || ys_int < 0 || ys_int >= src_h) {
abuf[x] = 0;
abuf[x] = 0x00;
}
else {