Prevent Red Channel from clobbering Green in color_blend_true_color_additive()  - In 8 and 32 bit mode, Red channel data would leak into Green
Prevent Red Channel from clobbering Green in color_blend_true_color_additive()
 - In 8 and 32 bit mode, Red channel data would leak into Green

littlevgl/lvgl,littlevgl/lvgl,littlevgl/lvgl,littlevgl/lvgl