125 lines
4.5 KiB
C++
125 lines
4.5 KiB
C++
#include "pico_graphics.hpp"
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namespace pimoroni {
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PicoGraphics_PenP8::PicoGraphics_PenP8(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_P8;
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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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for(auto i = 0u; i < palette_size; i++) {
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palette[i] = {uint8_t(i), uint8_t(i), uint8_t(i)};
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used[i] = false;
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}
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cache_built = false;
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}
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void PicoGraphics_PenP8::set_pen(uint c) {
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color = c;
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}
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void PicoGraphics_PenP8::set_pen(uint8_t r, uint8_t g, uint8_t b) {
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int pen = RGB(r, g, b).closest(palette, 16);
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if(pen != -1) color = pen;
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}
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int PicoGraphics_PenP8::update_pen(uint8_t i, uint8_t r, uint8_t g, uint8_t b) {
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i &= 0xff;
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used[i] = true;
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palette[i] = {r, g, b};
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cache_built = false;
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return i;
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}
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int PicoGraphics_PenP8::create_pen(uint8_t r, uint8_t g, uint8_t b) {
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// Create a colour and place it in the palette if there's space
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for(auto i = 0u; i < palette_size; i++) {
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if(!used[i]) {
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palette[i] = {r, g, b};
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used[i] = true;
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cache_built = false;
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return i;
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}
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}
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return -1;
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}
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int PicoGraphics_PenP8::reset_pen(uint8_t i) {
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palette[i] = {0, 0, 0};
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used[i] = false;
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cache_built = false;
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return i;
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}
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void PicoGraphics_PenP8::set_pixel(const Point &p) {
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uint8_t *buf = (uint8_t *)frame_buffer;
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buf[p.y * bounds.w + p.x] = color;
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}
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void PicoGraphics_PenP8::set_pixel_span(const Point &p, uint l) {
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// pointer to byte in framebuffer that contains this pixel
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uint8_t *buf = (uint8_t *)frame_buffer;
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buf = &buf[p.y * bounds.w + p.x];
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while(l--) {
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*buf++ = color;
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}
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}
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void PicoGraphics_PenP8::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_PenP8::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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RGB cache_col((i & 0x1C0) >> 1, (i & 0x38) << 2, (i & 0x7) << 5);
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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_PenP8::scanline_convert(PenType type, conversion_callback_func callback) {
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if(type == PEN_RGB565) {
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// Cache the RGB888 palette as RGB565
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RGB565 cache[palette_size];
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for(auto i = 0u; i < palette_size; i++) {
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cache[i] = palette[i].to_rgb565();
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}
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// Treat our void* frame_buffer as uint8_t
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uint8_t *src = (uint8_t *)frame_buffer;
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// Allocate two per-row temporary buffers, as the callback may transfer by DMA
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// while we're preparing the next row
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uint16_t row_buf[2][bounds.w];
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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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row_buf[y & 1][x] = cache[src[bounds.w * y + x]];
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}
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// Callback to the driver with the row data
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callback(row_buf[y & 1], bounds.w * sizeof(RGB565));
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}
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}
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}
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}
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