From 1e3dc2401263a436a32377e207352ffbe6984e8f Mon Sep 17 00:00:00 2001 From: Paul Duncan Date: Sun, 3 Feb 2019 04:54:10 -0500 Subject: add outstanding changes --- km-draw.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 km-draw.c (limited to 'km-draw.c') diff --git a/km-draw.c b/km-draw.c new file mode 100644 index 0000000..7f59df3 --- /dev/null +++ b/km-draw.c @@ -0,0 +1,30 @@ +#include // size_t +#include "util.h" +#include "km.h" + +void +km_set_draw( + const km_set_t * const set, + uint8_t * const rgb, + const size_t width, + const size_t height, + const uint32_t color +) { + for (size_t i = 0; i < set->num_rows; i++) { + const float *row = km_set_get_row(set, i); + const size_t x = (width - 1) * row[0], + y = (height - 1) * row[1], + ofs = 3 * (width * y + x); + + if (x >= width || y >= height) { + die( + "km_set_draw(): point out of bounds (row: %zu, point: [%0.2f, %0.2f], pixel: %zux%zu, bounds: %zux%zu)", + i, row[0], row[1], x, y, width, height + ); + } + + rgb[ofs + 0] = (color & 0xff0000) >> 16; + rgb[ofs + 1] = (color & 0x00ff00) >> 8; + rgb[ofs + 2] = (color & 0x0000ff); + } +} -- cgit v1.2.3