2018-01-02 21:25:41 -05:00
|
|
|
/*
|
|
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
|
|
*
|
|
|
|
* The MIT License (MIT)
|
|
|
|
*
|
|
|
|
* Copyright (c) 2017 Radomir Dopieralski
|
|
|
|
*
|
|
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
|
|
* in the Software without restriction, including without limitation the rights
|
|
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
|
|
* furnished to do so, subject to the following conditions:
|
|
|
|
*
|
|
|
|
* The above copyright notice and this permission notice shall be included in
|
|
|
|
* all copies or substantial portions of the Software.
|
|
|
|
*
|
|
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
|
|
* THE SOFTWARE.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "Layer.h"
|
|
|
|
#include "__init__.h"
|
|
|
|
|
|
|
|
|
|
|
|
// Get the color of the pixel on the layer.
|
2018-03-11 07:01:48 -04:00
|
|
|
uint16_t get_layer_pixel(layer_obj_t *layer, uint16_t x, uint16_t y) {
|
2018-01-02 21:25:41 -05:00
|
|
|
|
|
|
|
// Shift by the layer's position offset.
|
|
|
|
x -= layer->x;
|
|
|
|
y -= layer->y;
|
|
|
|
|
|
|
|
// Bounds check.
|
|
|
|
if ((x < 0) || (x >= layer->width << 4) ||
|
|
|
|
(y < 0) || (y >= layer->height << 4)) {
|
|
|
|
return TRANSPARENT;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Get the tile from the grid location or from sprite frame.
|
|
|
|
uint8_t frame = layer->frame;
|
|
|
|
if (layer->map) {
|
|
|
|
uint8_t tx = x >> 4;
|
|
|
|
uint8_t ty = y >> 4;
|
|
|
|
|
|
|
|
frame = layer->map[(ty * layer->width + tx) >> 1];
|
|
|
|
if (tx & 0x01) {
|
|
|
|
frame &= 0x0f;
|
|
|
|
} else {
|
|
|
|
frame >>= 4;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Get the position within the tile.
|
|
|
|
x &= 0x0f;
|
|
|
|
y &= 0x0f;
|
|
|
|
|
|
|
|
// Rotate the image.
|
|
|
|
uint8_t ty = y; // Temporary variable for swapping.
|
|
|
|
switch (layer->rotation) {
|
|
|
|
case 1: // 90 degrees clockwise
|
|
|
|
y = 15 - x;
|
|
|
|
x = ty;
|
|
|
|
break;
|
|
|
|
case 2: // 180 degrees
|
|
|
|
y = 15 - ty;
|
|
|
|
x = 15 - x;
|
|
|
|
break;
|
|
|
|
case 3: // 90 degrees counter-clockwise
|
|
|
|
y = x;
|
|
|
|
x = 15 - ty;
|
|
|
|
break;
|
|
|
|
case 4: // 0 degrees, mirrored
|
|
|
|
x = 15 - x;
|
|
|
|
break;
|
|
|
|
case 5: // 90 degrees clockwise, mirrored
|
|
|
|
y = x;
|
|
|
|
x = ty;
|
|
|
|
break;
|
|
|
|
case 6: // 180 degrees, mirrored
|
|
|
|
y = 15 - ty;
|
|
|
|
break;
|
|
|
|
case 7: // 90 degrees counter-clockwise, mirrored
|
|
|
|
y = 15 - x;
|
|
|
|
x = 15 - ty;
|
|
|
|
break;
|
|
|
|
default: // 0 degrees
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Get the value of the pixel.
|
|
|
|
uint8_t pixel = layer->graphic[(frame << 7) + (y << 3) + (x >> 1)];
|
|
|
|
if (x & 0x01) {
|
|
|
|
pixel &= 0x0f;
|
|
|
|
} else {
|
|
|
|
pixel >>= 4;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Convert to 16-bit color using the palette.
|
|
|
|
return layer->palette[pixel << 1] | layer->palette[(pixel << 1) + 1] << 8;
|
|
|
|
}
|