106 lines
3.2 KiB
C
106 lines
3.2 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 "Layer.h"
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#include "__init__.h"
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// Get the color of the pixel on the layer.
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uint16_t get_layer_pixel(layer_obj_t *layer, int16_t x, int16_t y) {
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// Shift by the layer's position offset.
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x -= layer->x;
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y -= layer->y;
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// Bounds check.
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if ((x < 0) || (x >= layer->width << 4) ||
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(y < 0) || (y >= layer->height << 4)) {
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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 frame = layer->frame;
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if (layer->map) {
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uint8_t tx = x >> 4;
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uint8_t ty = y >> 4;
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frame = layer->map[(ty * layer->width + tx) >> 1];
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if (tx & 0x01) {
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frame &= 0x0f;
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} else {
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frame >>= 4;
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}
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}
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// Get the position within the tile.
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x &= 0x0f;
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y &= 0x0f;
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// Rotate the image.
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uint8_t ty = y; // Temporary variable for swapping.
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switch (layer->rotation) {
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case 1: // 90 degrees clockwise
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y = 15 - x;
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x = ty;
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break;
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case 2: // 180 degrees
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y = 15 - ty;
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x = 15 - x;
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break;
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case 3: // 90 degrees counter-clockwise
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y = x;
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x = 15 - ty;
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break;
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case 4: // 0 degrees, mirrored
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x = 15 - x;
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break;
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case 5: // 90 degrees clockwise, mirrored
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y = x;
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x = ty;
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break;
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case 6: // 180 degrees, mirrored
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y = 15 - ty;
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break;
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case 7: // 90 degrees counter-clockwise, mirrored
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y = 15 - x;
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x = 15 - ty;
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break;
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default: // 0 degrees
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break;
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}
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// Get the value of the pixel.
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uint8_t pixel = layer->graphic[(frame << 7) + (y << 3) + (x >> 1)];
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if (x & 0x01) {
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pixel &= 0x0f;
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} else {
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pixel >>= 4;
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}
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// Convert to 16-bit color using the palette.
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return layer->palette[pixel << 1] | layer->palette[(pixel << 1) + 1] << 8;
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}
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