371 lines
13 KiB
C
371 lines
13 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "shared-bindings/displayio/ColorConverter.h"
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#include "py/misc.h"
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#include "py/runtime.h"
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#define NO_TRANSPARENT_COLOR (0x1000000)
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uint32_t displayio_colorconverter_dither_noise_1(uint32_t n) {
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n = (n >> 13) ^ n;
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int nn = (n * (n * n * 60493 + 19990303) + 1376312589) & 0x7fffffff;
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return (uint32_t)(((float)nn / (1073741824.0f * 2)) * 255);
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}
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uint32_t displayio_colorconverter_dither_noise_2(uint32_t x, uint32_t y) {
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return displayio_colorconverter_dither_noise_1(x + y * 0xFFFF);
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}
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void common_hal_displayio_colorconverter_construct(displayio_colorconverter_t *self, bool dither, displayio_colorspace_t input_colorspace) {
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self->dither = dither;
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self->transparent_color = NO_TRANSPARENT_COLOR;
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self->input_colorspace = input_colorspace;
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self->output_colorspace.depth = 16;
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}
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uint16_t displayio_colorconverter_compute_rgb565(uint32_t color_rgb888) {
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uint32_t r5 = (color_rgb888 >> 19);
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uint32_t g6 = (color_rgb888 >> 10) & 0x3f;
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uint32_t b5 = (color_rgb888 >> 3) & 0x1f;
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return r5 << 11 | g6 << 5 | b5;
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}
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uint8_t displayio_colorconverter_compute_rgb332(uint32_t color_rgb888) {
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uint32_t r3 = (color_rgb888 >> 21);
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uint32_t g3 = (color_rgb888 >> 13) & 0x7;
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uint32_t b2 = (color_rgb888 >> 6) & 0x3;
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return r3 << 5 | g3 << 2 | b2;
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}
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uint8_t displayio_colorconverter_compute_rgbd(uint32_t color_rgb888) {
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uint32_t r1 = (color_rgb888 >> 23) & 0x1;
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uint32_t g1 = (color_rgb888 >> 15) & 0x1;
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uint32_t b1 = (color_rgb888 >> 7) & 0x1;
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return r1 << 3 | g1 << 2 | b1 << 1 /* | dummy */;
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}
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uint8_t displayio_colorconverter_compute_luma(uint32_t color_rgb888) {
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uint32_t r8 = (color_rgb888 >> 16);
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uint32_t g8 = (color_rgb888 >> 8) & 0xff;
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uint32_t b8 = color_rgb888 & 0xff;
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return (r8 * 19 + g8 * 182 + b8 * 54) / 255;
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}
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uint8_t displayio_colorconverter_compute_chroma(uint32_t color_rgb888) {
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uint32_t r8 = (color_rgb888 >> 16);
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uint32_t g8 = (color_rgb888 >> 8) & 0xff;
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uint32_t b8 = color_rgb888 & 0xff;
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uint8_t max = MAX(r8, MAX(g8, b8));
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uint8_t min = MIN(r8, MIN(g8, b8));
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return max - min;
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}
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uint8_t displayio_colorconverter_compute_hue(uint32_t color_rgb888) {
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uint32_t r8 = (color_rgb888 >> 16);
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uint32_t g8 = (color_rgb888 >> 8) & 0xff;
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uint32_t b8 = color_rgb888 & 0xff;
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uint8_t max = MAX(r8, MAX(g8, b8));
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uint8_t min = MIN(r8, MIN(g8, b8));
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uint8_t c = max - min;
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if (c == 0) {
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return 0;
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}
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int32_t hue = 0;
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if (max == r8) {
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hue = (((int32_t)(g8 - b8) * 40) / c) % 240;
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} else if (max == g8) {
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hue = (((int32_t)(b8 - r8) + (2 * c)) * 40) / c;
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} else if (max == b8) {
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hue = (((int32_t)(r8 - g8) + (4 * c)) * 40) / c;
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}
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if (hue < 0) {
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hue += 240;
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}
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return hue;
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}
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uint8_t displayio_colorconverter_compute_sevencolor(uint32_t color_rgb888) {
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// This is DDX=1, the default for the displays.
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uint8_t chroma = displayio_colorconverter_compute_chroma(color_rgb888);
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if (chroma >= 64) {
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uint8_t hue = displayio_colorconverter_compute_hue(color_rgb888);
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// Red 0
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if (hue < 10) {
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return 0x4;
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}
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// Orange 21
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if (hue < 21 + 10) {
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return 0x6;
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}
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// Yellow 42
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if (hue < 42 + 21) {
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return 0x5;
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}
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// Green 85
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if (hue < 85 + 42) {
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return 0x2;
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}
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// Blue 170
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if (hue < 170 + 42) {
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return 0x3;
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}
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// The rest is red to 255
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return 0x4;
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} else {
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uint8_t luma = displayio_colorconverter_compute_luma(color_rgb888);
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if (luma >= 128) {
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return 0x1; // White
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} else {
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return 0x0; // Black
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}
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}
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}
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void displayio_colorconverter_compute_tricolor(const _displayio_colorspace_t *colorspace, uint8_t pixel_hue, uint32_t *color) {
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int16_t hue_diff = colorspace->tricolor_hue - pixel_hue;
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if ((-10 <= hue_diff && hue_diff <= 10) || hue_diff <= -220 || hue_diff >= 220) {
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if (colorspace->grayscale) {
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*color = 0;
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} else {
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*color = 1;
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}
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} else if (!colorspace->grayscale) {
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*color = 0;
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}
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}
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void common_hal_displayio_colorconverter_convert(displayio_colorconverter_t *self, const _displayio_colorspace_t *colorspace, uint32_t input_color, uint32_t *output_color) {
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displayio_input_pixel_t input_pixel;
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input_pixel.pixel = input_color;
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input_pixel.x = input_pixel.y = input_pixel.tile = input_pixel.tile_x = input_pixel.tile_y = 0;
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displayio_output_pixel_t output_pixel;
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output_pixel.pixel = 0;
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output_pixel.opaque = false;
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displayio_colorconverter_convert(self, colorspace, &input_pixel, &output_pixel);
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(*output_color) = output_pixel.pixel;
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}
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void common_hal_displayio_colorconverter_set_dither(displayio_colorconverter_t *self, bool dither) {
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self->dither = dither;
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}
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bool common_hal_displayio_colorconverter_get_dither(displayio_colorconverter_t *self) {
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return self->dither;
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}
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void common_hal_displayio_colorconverter_make_transparent(displayio_colorconverter_t *self, uint32_t transparent_color) {
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if (self->transparent_color != NO_TRANSPARENT_COLOR) {
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mp_raise_RuntimeError(MP_ERROR_TEXT("Only one color can be transparent at a time"));
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}
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self->transparent_color = transparent_color;
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}
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void common_hal_displayio_colorconverter_make_opaque(displayio_colorconverter_t *self, uint32_t transparent_color) {
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(void)transparent_color;
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// NO_TRANSPARENT_COLOR will never equal a valid color
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self->transparent_color = NO_TRANSPARENT_COLOR;
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}
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// Convert a single input pixel to RGB888
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uint32_t displayio_colorconverter_convert_pixel(displayio_colorspace_t colorspace, uint32_t pixel) {
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switch (colorspace) {
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case DISPLAYIO_COLORSPACE_RGB565_SWAPPED:
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pixel = __builtin_bswap16(pixel);
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MP_FALLTHROUGH;
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case DISPLAYIO_COLORSPACE_RGB565: {
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uint32_t r8 = (pixel >> 11) << 3;
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uint32_t g8 = ((pixel >> 5) << 2) & 0xff;
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uint32_t b8 = (pixel << 3) & 0xff;
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pixel = (r8 << 16) | (g8 << 8) | b8;
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}
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break;
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case DISPLAYIO_COLORSPACE_RGB555_SWAPPED:
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pixel = __builtin_bswap16(pixel);
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MP_FALLTHROUGH;
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case DISPLAYIO_COLORSPACE_RGB555: {
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uint32_t r8 = (pixel >> 10) << 3;
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uint32_t g8 = ((pixel >> 5) << 3) & 0xff;
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uint32_t b8 = (pixel << 3) & 0xff;
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pixel = (r8 << 16) | (g8 << 8) | b8;
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}
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break;
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case DISPLAYIO_COLORSPACE_BGR565_SWAPPED:
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pixel = __builtin_bswap16(pixel);
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MP_FALLTHROUGH;
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case DISPLAYIO_COLORSPACE_BGR565: {
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uint32_t b8 = (pixel >> 11) << 3;
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uint32_t g8 = ((pixel >> 5) << 2) & 0xff;
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uint32_t r8 = (pixel << 3) & 0xff;
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pixel = (r8 << 16) | (g8 << 8) | b8;
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}
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break;
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case DISPLAYIO_COLORSPACE_BGR555_SWAPPED:
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pixel = __builtin_bswap16(pixel);
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MP_FALLTHROUGH;
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case DISPLAYIO_COLORSPACE_BGR555: {
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uint32_t b8 = (pixel >> 10) << 3;
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uint32_t g8 = ((pixel >> 5) << 3) & 0xff;
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uint32_t r8 = (pixel << 3) & 0xff;
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pixel = (r8 << 16) | (g8 << 8) | b8;
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}
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break;
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default:
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case DISPLAYIO_COLORSPACE_RGB888:
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break;
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case DISPLAYIO_COLORSPACE_L8: {
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uint32_t l8 = pixel & 0xff;
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pixel = l8 * 0x010101;
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}
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break;
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}
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return pixel;
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}
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void displayio_convert_color(const _displayio_colorspace_t *colorspace, bool dither, const displayio_input_pixel_t *input_pixel, displayio_output_pixel_t *output_color) {
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uint32_t pixel = input_pixel->pixel;
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if (dither) {
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uint8_t randr = (displayio_colorconverter_dither_noise_2(input_pixel->tile_x, input_pixel->tile_y));
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uint8_t randg = (displayio_colorconverter_dither_noise_2(input_pixel->tile_x + 33, input_pixel->tile_y));
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uint8_t randb = (displayio_colorconverter_dither_noise_2(input_pixel->tile_x, input_pixel->tile_y + 33));
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uint32_t r8 = (pixel >> 16);
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uint32_t g8 = (pixel >> 8) & 0xff;
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uint32_t b8 = pixel & 0xff;
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if (colorspace->depth == 16) {
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b8 = MIN(255, b8 + (randb & 0x07));
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r8 = MIN(255, r8 + (randr & 0x07));
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g8 = MIN(255, g8 + (randg & 0x03));
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} else {
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int bitmask = 0xFF >> colorspace->depth;
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b8 = MIN(255, b8 + (randb & bitmask));
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r8 = MIN(255, r8 + (randr & bitmask));
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g8 = MIN(255, g8 + (randg & bitmask));
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}
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pixel = r8 << 16 | g8 << 8 | b8;
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}
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if (colorspace->depth == 16) {
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uint16_t packed = displayio_colorconverter_compute_rgb565(pixel);
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if (colorspace->reverse_bytes_in_word) {
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// swap bytes
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packed = __builtin_bswap16(packed);
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}
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output_color->pixel = packed;
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output_color->opaque = true;
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return;
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} else if (colorspace->tricolor) {
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uint8_t luma = displayio_colorconverter_compute_luma(pixel);
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output_color->pixel = luma >> (8 - colorspace->depth);
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if (displayio_colorconverter_compute_chroma(pixel) <= 16) {
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if (!colorspace->grayscale) {
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output_color->pixel = 0;
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}
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output_color->opaque = true;
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return;
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}
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uint8_t pixel_hue = displayio_colorconverter_compute_hue(pixel);
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displayio_colorconverter_compute_tricolor(colorspace, pixel_hue, &output_color->pixel);
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return;
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} else if (colorspace->grayscale && colorspace->depth <= 8) {
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uint8_t luma = displayio_colorconverter_compute_luma(pixel);
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size_t bitmask = (1 << colorspace->depth) - 1;
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output_color->pixel = (luma >> colorspace->grayscale_bit) & bitmask;
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output_color->opaque = true;
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return;
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} else if (colorspace->depth == 32) {
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output_color->pixel = pixel;
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output_color->opaque = true;
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return;
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} else if (colorspace->depth == 8 && !colorspace->grayscale) {
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uint8_t packed = displayio_colorconverter_compute_rgb332(pixel);
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output_color->pixel = packed;
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output_color->opaque = true;
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return;
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} else if (colorspace->depth == 4) {
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uint8_t packed;
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if (colorspace->sevencolor) {
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packed = displayio_colorconverter_compute_sevencolor(pixel);
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} else {
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packed = displayio_colorconverter_compute_rgbd(pixel);
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}
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output_color->pixel = packed;
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output_color->opaque = true;
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return;
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}
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output_color->opaque = false;
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}
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void displayio_colorconverter_convert(displayio_colorconverter_t *self, const _displayio_colorspace_t *colorspace, const displayio_input_pixel_t *input_pixel, displayio_output_pixel_t *output_color) {
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uint32_t pixel = input_pixel->pixel;
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if (self->transparent_color == pixel) {
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output_color->opaque = false;
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return;
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}
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if (!self->dither && self->cached_colorspace == colorspace && self->cached_input_pixel == input_pixel->pixel) {
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output_color->pixel = self->cached_output_color;
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return;
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}
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displayio_input_pixel_t rgb888_pixel = *input_pixel;
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rgb888_pixel.pixel = displayio_colorconverter_convert_pixel(self->input_colorspace, input_pixel->pixel);
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displayio_convert_color(colorspace, self->dither, &rgb888_pixel, output_color);
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if (!self->dither) {
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self->cached_colorspace = colorspace;
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self->cached_input_pixel = input_pixel->pixel;
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self->cached_output_color = output_color->pixel;
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}
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}
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// Currently no refresh logic is needed for a ColorConverter.
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bool displayio_colorconverter_needs_refresh(displayio_colorconverter_t *self) {
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return false;
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}
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void displayio_colorconverter_finish_refresh(displayio_colorconverter_t *self) {
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}
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