pimoroni-pico/libraries/pico_graphics/pico_graphics_pen_1bitY.cpp

57 lines
1.3 KiB
C++
Raw Permalink Normal View History

#include "pico_graphics.hpp"
namespace pimoroni {
PicoGraphics_Pen1BitY::PicoGraphics_Pen1BitY(uint16_t width, uint16_t height, void *frame_buffer)
: PicoGraphics(width, height, frame_buffer) {
this->pen_type = PEN_1BIT;
if(this->frame_buffer == nullptr) {
this->frame_buffer = (void *)(new uint8_t[buffer_size(width, height)]);
}
}
void PicoGraphics_Pen1BitY::set_pen(uint c) {
color = c;
}
void PicoGraphics_Pen1BitY::set_pen(uint8_t r, uint8_t g, uint8_t b) {
color = std::max(r, std::max(g, b)) >> 4;
}
void PicoGraphics_Pen1BitY::set_pixel(const Point &p) {
// pointer to byte in framebuffer that contains this pixel
uint8_t *buf = (uint8_t *)frame_buffer;
uint8_t *f = &buf[(p.y / 8) + (p.x * bounds.h / 8)];
uint bo = 7 - (p.y & 0b111);
uint8_t _dc = 0;
if(color == 0) {
_dc = 0;
} else if (color == 15) {
_dc = 1;
} else {
uint8_t _dmv = dither16_pattern[(p.x & 0b11) | ((p.y & 0b11) << 2)];
_dc = color > _dmv ? 1 : 0;
}
// forceably clear the bit
*f &= ~(1U << bo);
// set pixel
*f |= (_dc << bo);
}
void PicoGraphics_Pen1BitY::set_pixel_span(const Point &p, uint l) {
Point lp = p;
if(p.x + (int)l >= bounds.w) {
l = bounds.w - p.x;
}
while(l--) {
set_pixel(lp);
lp.x++;
}
}
}