71 lines
3.0 KiB
C
71 lines
3.0 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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void common_hal_displayio_colorconverter_construct(displayio_colorconverter_t* self) {
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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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uint32_t packed = r5 << 11 | g6 << 5 | b5;
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// swap bytes
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return __builtin_bswap16(packed);
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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) / 255 + (g8 * 182) / 255 + (b8 + 54) / 255;
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}
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bool displayio_colorconverter_convert(displayio_colorconverter_t *self, const _displayio_colorspace_t* colorspace, uint32_t input_color, uint32_t* output_color) {
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if (colorspace->depth == 16) {
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*output_color = displayio_colorconverter_compute_rgb565(input_color);
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return true;
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} else if (colorspace->grayscale && colorspace->depth <= 8) {
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uint8_t luma = displayio_colorconverter_compute_luma(input_color);
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*output_color = luma >> (8 - colorspace->depth);
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return true;
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}
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return false;
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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_colorconverter_convert(self, colorspace, input_color, output_color);
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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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