fix(core): fix blending mono 4 on mono 8 canvas

[no changelog]
4 weeks ago · 41273a25ed
parent 24c0552a43
commit 41273a25ed
1 changed files with 1 additions and 1 deletions
--- a/core/embed/lib/gfx_bitblt_mono8.c
+++ b/core/embed/lib/gfx_bitblt_mono8.c
@ -103,7 +103,7 @@ void gfx_mono8_blend_mono4(const gfx_bitblt_t* bb) {
      uint8_t src_data = src_row[(x + bb->src_x) / 2];
      uint8_t src_alpha = (x + bb->src_x) & 1 ? src_data >> 4 : src_data & 0x0F;
      src_alpha = src_alpha * bb->src_alpha / 15;
-      dst_ptr[x] = (fg * src_alpha + dst_ptr[x] * (255 - src_alpha));
+      dst_ptr[x] = (fg * src_alpha + dst_ptr[x] * (255 - src_alpha)) / 255;
    }
    dst_ptr += bb->dst_stride / sizeof(*dst_ptr);
    src_row += bb->src_stride / sizeof(*src_row);