175 lines
7.3 KiB
C
175 lines
7.3 KiB
C
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/*
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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) 2021 Kevin Matocha
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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/Bitmap.h"
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#include "py/runtime.h"
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#include "math.h"
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void common_hal_bitmaptools_rotozoom(displayio_bitmap_t *self, int16_t ox, int16_t oy,
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int16_t dest_clip0_x, int16_t dest_clip0_y,
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int16_t dest_clip1_x, int16_t dest_clip1_y,
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displayio_bitmap_t *source, int16_t px, int16_t py,
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int16_t source_clip0_x, int16_t source_clip0_y,
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int16_t source_clip1_x, int16_t source_clip1_y,
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float angle,
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float scale,
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uint32_t skip_index, bool skip_index_none) {
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// Copies region from source to the destination bitmap, including rotation,
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// scaling and clipping of either the source or destination regions
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//
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// *self: destination bitmap
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// ox: the (ox, oy) destination point where the source (px,py) point is placed
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// oy:
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// dest_clip0: (x,y) is the corner of the clip window on the destination bitmap
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// dest_clip1: (x,y) is the other corner of the clip window of the destination bitmap
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// *source: the source bitmap
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// px: the (px, py) point of rotation of the source bitmap
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// py:
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// source_clip0: (x,y) is the corner of the clip window on the source bitmap
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// source_clip1: (x,y) is the other of the clip window on the source bitmap
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// angle: angle of rotation in radians, positive is clockwise
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// scale: scale factor
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// skip_index: color index that should be ignored (and not copied over)
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// skip_index_none: if skip_index_none is True, then all color indexes should be copied
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// (that is, no color indexes should be skipped)
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// Copy complete "source" bitmap into "self" bitmap at location x,y in the "self"
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// Add a boolean to determine if all values are copied, or only if non-zero
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// If skip_value is encountered in the source bitmap, it will not be copied.
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// If skip_value is `None`, then all pixels are copied.
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// # Credit from https://github.com/wernsey/bitmap
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// # MIT License from
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// # * Copyright (c) 2017 Werner Stoop <wstoop@gmail.com>
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// #
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// # *
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// # * #### `void bm_rotate_blit(Bitmap *dst, int ox, int oy, Bitmap *src, int px, int py, double angle, double scale);`
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// # *
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// # * Rotates a source bitmap `src` around a pivot point `px,py` and blits it onto a destination bitmap `dst`.
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// # *
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// # * The bitmap is positioned such that the point `px,py` on the source is at the offset `ox,oy` on the destination.
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// # *
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// # * The `angle` is clockwise, in radians. The bitmap is also scaled by the factor `scale`.
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// #
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// # void bm_rotate_blit(Bitmap *dst, int ox, int oy, Bitmap *src, int px, int py, double angle, double scale);
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// # /*
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// # Reference:
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// # "Fast Bitmap Rotation and Scaling" By Steven Mortimer, Dr Dobbs' Journal, July 01, 2001
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// # http://www.drdobbs.com/architecture-and-design/fast-bitmap-rotation-and-scaling/184416337
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// # See also http://www.efg2.com/Lab/ImageProcessing/RotateScanline.htm
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// # */
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if (self->read_only) {
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mp_raise_RuntimeError(translate("Read-only object"));
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}
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int16_t x,y;
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int16_t minx = dest_clip1_x;
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int16_t miny = dest_clip1_y;
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int16_t maxx = dest_clip0_x;
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int16_t maxy = dest_clip0_y;
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float sinAngle = sinf(angle);
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float cosAngle = cosf(angle);
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float dx, dy;
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/* Compute the position of where each corner on the source bitmap
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will be on the destination to get a bounding box for scanning */
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dx = -cosAngle * px * scale + sinAngle * py * scale + ox;
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dy = -sinAngle * px * scale - cosAngle * py * scale + oy;
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if(dx < minx) minx = (int16_t)dx;
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if(dx > maxx) maxx = (int16_t)dx;
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if(dy < miny) miny = (int16_t)dy;
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if(dy > maxy) maxy = (int16_t)dy;
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dx = cosAngle * (source->width - px) * scale + sinAngle * py * scale + ox;
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dy = sinAngle * (source->width - px) * scale - cosAngle * py * scale + oy;
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if(dx < minx) minx = (int16_t)dx;
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if(dx > maxx) maxx = (int16_t)dx;
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if(dy < miny) miny = (int16_t)dy;
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if(dy > maxy) maxy = (int16_t)dy;
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dx = cosAngle * (source->width - px) * scale - sinAngle * (source->height - py) * scale + ox;
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dy = sinAngle * (source->width - px) * scale + cosAngle * (source->height - py) * scale + oy;
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if(dx < minx) minx = (int16_t)dx;
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if(dx > maxx) maxx = (int16_t)dx;
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if(dy < miny) miny = (int16_t)dy;
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if(dy > maxy) maxy = (int16_t)dy;
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dx = -cosAngle * px * scale - sinAngle * (source->height - py) * scale + ox;
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dy = -sinAngle * px * scale + cosAngle * (source->height - py) * scale + oy;
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if(dx < minx) minx = (int16_t)dx;
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if(dx > maxx) maxx = (int16_t)dx;
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if(dy < miny) miny = (int16_t)dy;
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if(dy > maxy) maxy = (int16_t)dy;
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/* Clipping */
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if(minx < dest_clip0_x) minx = dest_clip0_x;
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if(maxx > dest_clip1_x - 1) maxx = dest_clip1_x - 1;
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if(miny < dest_clip0_y) miny = dest_clip0_y;
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if(maxy > dest_clip1_y - 1) maxy = dest_clip1_y - 1;
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float dvCol = cosAngle / scale;
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float duCol = sinAngle / scale;
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float duRow = dvCol;
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float dvRow = -duCol;
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float startu = px - (ox * dvCol + oy * duCol);
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float startv = py - (ox * dvRow + oy * duRow);
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float rowu = startu + miny * duCol;
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float rowv = startv + miny * dvCol;
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for(y = miny; y <= maxy; y++) {
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float u = rowu + minx * duRow;
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float v = rowv + minx * dvRow;
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for(x = minx; x <= maxx; x++) {
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if(u >= source_clip0_x && u < source_clip1_x && v >= source_clip0_y && v < source_clip1_y) {
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uint32_t c = common_hal_displayio_bitmap_get_pixel(source, u, v);
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if( (skip_index_none) || (c != skip_index) ) {
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common_hal_displayio_bitmap_set_pixel(self, x, y, c);
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}
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}
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u += duRow;
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v += dvRow;
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}
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rowu += duCol;
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rowv += dvCol;
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}
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}
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