diff options
Diffstat (limited to 'src/km-draw.c')
-rw-r--r-- | src/km-draw.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/km-draw.c b/src/km-draw.c new file mode 100644 index 0000000..ddf1b26 --- /dev/null +++ b/src/km-draw.c @@ -0,0 +1,31 @@ +#include <stdint.h> // 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 int dot_size, + const uint32_t color +) { + for (size_t i = 0; i < set->num_rows; i++) { + const float *row = km_set_get_row(set, i); + + for (int yo = 0; yo < dot_size; yo++) { + for (int xo = 0; xo < dot_size; xo++) { + const int x = (width - 1) * row[0] - dot_size / 2 + xo, + y = (height - 1) * row[1] - dot_size / 2 + yo, + ofs = 3 * (width * y + x); + + if (x >= 0 && x < (int) width && y >= 0 && y < (int) height) { + rgb[ofs + 0] = (color & 0xff0000) >> 16; + rgb[ofs + 1] = (color & 0x00ff00) >> 8; + rgb[ofs + 2] = (color & 0x0000ff); + } + } + } + } +} |