pimoroni-pico/libraries/pico_graphics/pico_graphics_pen_inky7.cpp

105 lines
3.6 KiB
C++

#include "pico_graphics.hpp"
namespace pimoroni {
PicoGraphics_PenInky7::PicoGraphics_PenInky7(uint16_t width, uint16_t height, IDirectDisplayDriver<uint8_t> &direct_display_driver)
: PicoGraphics(width, height, nullptr),
driver(direct_display_driver) {
this->pen_type = PEN_INKY7;
}
void PicoGraphics_PenInky7::set_pen(uint c) {
color = c;
}
void PicoGraphics_PenInky7::set_pen(uint8_t r, uint8_t g, uint8_t b) {
color = RGB(r, g, b).to_rgb888() | 0x7f000000;
}
int PicoGraphics_PenInky7::create_pen(uint8_t r, uint8_t g, uint8_t b) {
return RGB(r, g, b).to_rgb888() | 0x7f000000;
}
int PicoGraphics_PenInky7::create_pen_hsv(float h, float s, float v) {
return RGB::from_hsv(h, s, v).to_rgb888() | 0x7f000000;
}
void PicoGraphics_PenInky7::set_pixel(const Point &p) {
if ((color & 0x7f000000) == 0x7f000000) {
set_pixel_dither(p, RGB(color));
} else {
driver.write_pixel(p, color & 0x07);
}
}
void PicoGraphics_PenInky7::set_pixel_span(const Point &p, uint l) {
if ((color & 0x7f000000) == 0x7f000000) {
for(auto x = 0u; x < l; x++) {
set_pixel_dither(p + Point(x, 0), RGB(color));
}
return;
}
driver.write_pixel_span(p, l, color);
}
void PicoGraphics_PenInky7::get_dither_candidates(const RGB &col, const RGB *palette, size_t len, std::array<uint8_t, 16> &candidates) {
RGB error;
for(size_t i = 0; i < candidates.size(); i++) {
candidates[i] = (col + error).closest(palette, len);
error += (col - palette[candidates[i]]);
}
// sort by a rough approximation of luminance, this ensures that neighbouring
// pixels in the dither matrix are at extreme opposites of luminence
// giving a more balanced output
std::sort(candidates.begin(), candidates.end(), [palette](int a, int b) {
return palette[a].luminance() > palette[b].luminance();
});
}
void PicoGraphics_PenInky7::set_pixel_dither(const Point &p, const RGB &c) {
if(!bounds.contains(p)) return;
if(!cache_built) {
for(uint i = 0; i < 512; i++) {
uint r = (i & 0x1c0) >> 1;
uint g = (i & 0x38) << 2;
uint b = (i & 0x7) << 5;
RGB cache_col(
r | (r >> 3) | (r >> 6),
g | (g >> 3) | (g >> 6),
b | (b >> 3) | (b >> 6)
);
get_dither_candidates(cache_col, palette, palette_size, candidate_cache[i]);
}
cache_built = true;
}
uint cache_key = ((c.r & 0xE0) << 1) | ((c.g & 0xE0) >> 2) | ((c.b & 0xE0) >> 5);
//get_dither_candidates(c, palette, 256, candidates);
// find the pattern coordinate offset
uint pattern_index = (p.x & 0b11) | ((p.y & 0b11) << 2);
// set the pixel
//color = candidates[pattern[pattern_index]];
driver.write_pixel(p, candidate_cache[cache_key][dither16_pattern[pattern_index]] & 0x07);
}
void PicoGraphics_PenInky7::frame_convert(PenType type, conversion_callback_func callback) {
if(type == PEN_INKY7) {
uint byte_count = bounds.w/2;
uint8_t buffer[bounds.w];
for(int32_t r = 0; r < bounds.h; r++)
{
driver.read_pixel_span(Point(0, r), bounds.w, buffer);
// for(int y=0; y < 800; y++)
// buffer[y] = rand() % 7;
// convert byte storage to nibble storage
uint8_t *pDst = buffer;
uint8_t *pSrc = buffer;
for(uint c = 0; c < byte_count; c++)
{
uint8_t nibble = ((*pSrc++) << 4);
nibble |= ((*pSrc++) & 0xf);
*pDst++ = nibble;
}
callback(buffer, byte_count);
}
}
}
}