From 8d4296f96430795936a22769da35732e5342b25c Mon Sep 17 00:00:00 2001 From: Scott Shawcroft Date: Tue, 10 Nov 2020 18:02:16 -0800 Subject: Add board.DISPLAY to MagTag. Fix luma computation * Initialize the EPaper display on the MagTag at start. * Tweak the display send to take a const buffer. * Correct Luma math * Multiply the blue component, not add. * Add all of the components together before dividing. This reduces the impact of truncated division. --- shared-module/displayio/ColorConverter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'shared-module/displayio/ColorConverter.c') diff --git a/shared-module/displayio/ColorConverter.c b/shared-module/displayio/ColorConverter.c index 03ec99ceb..80558d037 100644 --- a/shared-module/displayio/ColorConverter.c +++ b/shared-module/displayio/ColorConverter.c @@ -55,7 +55,7 @@ uint8_t displayio_colorconverter_compute_luma(uint32_t color_rgb888) { uint32_t r8 = (color_rgb888 >> 16); uint32_t g8 = (color_rgb888 >> 8) & 0xff; uint32_t b8 = color_rgb888 & 0xff; - return (r8 * 19) / 255 + (g8 * 182) / 255 + (b8 + 54) / 255; + return (r8 * 19 + g8 * 182 + b8 * 54) / 255; } uint8_t displayio_colorconverter_compute_chroma(uint32_t color_rgb888) { -- cgit v1.2.3