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