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fix(canvas): fix transformation

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This commit is contained in:
Gabor Kiss-Vamosi
2023-03-03 12:07:53 +01:00
parent 67941f4964
commit ceb4dbcb04
1 changed files with 12 additions and 4 deletions
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16
src/widgets/canvas/lv_canvas.c
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@@ -169,7 +169,7 @@ void lv_canvas_transform(lv_obj_t * obj, lv_img_dsc_t * src_img, int16_t angle,
lv_coord_t offset_y,
int32_t pivot_x, int32_t pivot_y, bool antialias)
{
#if LV_USE_DRAW_MASKS && 0
#if LV_USE_DRAW_MASKS
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(src_img);
@@ -193,16 +193,24 @@ void lv_canvas_transform(lv_obj_t * obj, lv_img_dsc_t * src_img, int16_t angle,
dest_area.y1 = -offset_y;
dest_area.y2 = -offset_y;
lv_draw_img_sup_t sup;
lv_memzero(&sup, sizeof(sup));
/*Create a dummy display to fool the lv_draw function.
*It will think it draws to real screen.*/
lv_area_t clip_area;
lv_draw_ctx_t * draw_ctx = init_fake_disp(obj, &clip_area);
lv_color_t * cbuf = lv_malloc(dest_img->header.w * sizeof(lv_color_t));
lv_opa_t * abuf = lv_malloc(dest_img->header.w * sizeof(lv_opa_t));
for(y = 0; y < dest_img->header.h; y++) {
if(y + offset_y >= 0) {
lv_draw_sw_transform(NULL, &dest_area, src_img->data, src_img->header.w, src_img->header.h, src_img->header.w,
&draw_dsc, canvas->dsc.header.cf, cbuf, abuf);
lv_draw_sw_transform(draw_ctx, &dest_area, src_img->data, src_img->header.w, src_img->header.h, src_img->header.w,
&draw_dsc, &sup, canvas->dsc.header.cf, cbuf, abuf);
for(x = 0; x < dest_img->header.w; x++) {
if(abuf[x]) {
lv_canvas_set_px(dest_img, x, y, cbuf[x], abuf[x]);
lv_canvas_set_px(obj, x, y, cbuf[x], abuf[x]);
}
}