121 lines
4.2 KiB
C++
121 lines
4.2 KiB
C++
#include "pico_graphics.hpp"
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namespace pimoroni {
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PicoGraphics_Pen3Bit::PicoGraphics_Pen3Bit(uint16_t width, uint16_t height, void *frame_buffer)
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: PicoGraphics(width, height, frame_buffer) {
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this->pen_type = PEN_3BIT;
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if(this->frame_buffer == nullptr) {
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this->frame_buffer = (void *)(new uint8_t[buffer_size(width, height)]);
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}
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cache_built = false;
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}
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void PicoGraphics_Pen3Bit::set_pen(uint c) {
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color = c & 0xf;
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}
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void PicoGraphics_Pen3Bit::set_pen(uint8_t r, uint8_t g, uint8_t b) {
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}
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void PicoGraphics_Pen3Bit::set_pixel(const Point &p) {
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uint offset = (bounds.w * bounds.h) / 8;
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uint8_t *buf = (uint8_t *)frame_buffer;
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uint bo = 7 - (p.x & 0b111);
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uint8_t *bufA = &buf[(p.x / 8) + (p.y * bounds.w / 8)];
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uint8_t *bufB = bufA + offset;
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uint8_t *bufC = bufA + offset + offset;
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uint8_t cA = (color & 0b100) >> 2;
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*bufA &= ~(1U << bo);
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*bufA |= (cA << bo);
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uint8_t cB = (color & 0b010) >> 1;
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*bufB &= ~(1U << bo);
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*bufB |= (cB << bo);
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uint8_t cC = (color & 0b001);
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*bufC &= ~(1U << bo);
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*bufC |= (cC << bo);
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}
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void PicoGraphics_Pen3Bit::set_pixel_span(const Point &p, uint l) {
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Point lp = p;
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while(l--) {
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set_pixel(lp);
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lp.x++;
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}
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}
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void PicoGraphics_Pen3Bit::get_dither_candidates(const RGB &col, const RGB *palette, size_t len, std::array<uint8_t, 16> &candidates) {
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RGB error;
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for(size_t i = 0; i < candidates.size(); i++) {
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candidates[i] = (col + error).closest(palette, len);
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error += (col - palette[candidates[i]]);
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}
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// sort by a rough approximation of luminance, this ensures that neighbouring
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// pixels in the dither matrix are at extreme opposites of luminence
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// giving a more balanced output
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std::sort(candidates.begin(), candidates.end(), [palette](int a, int b) {
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return palette[a].luminance() > palette[b].luminance();
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});
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}
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void PicoGraphics_Pen3Bit::set_pixel_dither(const Point &p, const RGB &c) {
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if(!bounds.contains(p)) return;
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if(!cache_built) {
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for(uint i = 0; i < 512; i++) {
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uint r = (i & 0x1c0) >> 1;
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uint g = (i & 0x38) << 2;
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uint b = (i & 0x7) << 5;
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RGB cache_col(
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r | (r >> 3) | (r >> 6),
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g | (g >> 3) | (g >> 6),
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b | (b >> 3) | (b >> 6)
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);
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get_dither_candidates(cache_col, palette, palette_size, candidate_cache[i]);
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}
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cache_built = true;
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}
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uint cache_key = ((c.r & 0xE0) << 1) | ((c.g & 0xE0) >> 2) | ((c.b & 0xE0) >> 5);
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//get_dither_candidates(c, palette, 256, candidates);
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// find the pattern coordinate offset
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uint pattern_index = (p.x & 0b11) | ((p.y & 0b11) << 2);
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// set the pixel
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//color = candidates[pattern[pattern_index]];
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color = candidate_cache[cache_key][dither16_pattern[pattern_index]];
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set_pixel(p);
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}
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void PicoGraphics_Pen3Bit::scanline_convert(PenType type, conversion_callback_func callback) {
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if(type == PEN_P4) {
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uint8_t row_buf[bounds.w / 2];
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uint offset = (bounds.w * bounds.h) / 8;
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uint8_t *buf = (uint8_t *)frame_buffer;
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for(auto y = 0; y < bounds.h; y++) {
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for(auto x = 0; x < bounds.w; x++) {
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uint bo = 7 - (x & 0b111);
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uint8_t *bufA = &buf[(x / 8) + (y * bounds.w / 8)];
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uint8_t *bufB = bufA + offset;
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uint8_t *bufC = bufA + offset + offset;
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uint8_t nibble = (*bufA >> bo) & 1U;
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nibble <<= 1;
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nibble |= (*bufB >> bo) & 1U;
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nibble <<= 1;
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nibble |= (*bufC >> bo) & 1U;
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nibble <<= (x & 0b1) ? 0 : 4;
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row_buf[x / 2] &= (x & 0b1) ? 0b11110000 : 0b00001111;
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row_buf[x / 2] |= nibble;
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}
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callback(row_buf, bounds.w / 2);
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}
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}
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}
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} |