68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* This file is part of the MicroPython 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) 2017 Radomir Dopieralski
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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 "Text.h"
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#include "__init__.h"
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// Get the color of the pixel on the text.
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uint16_t get_text_pixel(text_obj_t *text, int16_t x, int16_t y) {
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// Shift by the text's position offset.
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x -= text->x;
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y -= text->y;
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// Bounds check.
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if ((x < 0) || (x >= text->width << 3) ||
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(y < 0) || (y >= text->height << 3)) {
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return TRANSPARENT;
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}
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// Get the tile from the grid location or from sprite frame.
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uint8_t tx = x >> 3;
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uint8_t ty = y >> 3;
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uint8_t c = text->chars[ty * text->width + tx];
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uint8_t color_offset = 0;
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if (c & 0x80) {
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color_offset = 4;
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}
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c &= 0x7f;
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if (!c) {
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return TRANSPARENT;
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}
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// Get the position within the char.
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x &= 0x07;
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y &= 0x07;
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// Get the value of the pixel.
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uint8_t pixel = text->font[(c << 4) + (y << 1) + (x >> 2)];
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pixel = ((pixel >> ((x & 0x03) << 1)) & 0x03) + color_offset;
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// Convert to 16-bit color using the palette.
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return text->palette[pixel << 1] | text->palette[(pixel << 1) + 1] << 8;
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}
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