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event_filter: transformation of motion coordinates
The <transform> filter configurably transforms touch and absolute-motion event coordinates by a sequence of translation (move), scaling, rotation, and flipping primitives in sub-nodes. Issue #5105
This commit is contained in:
Christian Helmuth
parent
7304a019e7
commit
5f2691a65b
@ -96,6 +96,34 @@ one of the following filters:
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rectangular area - using the attributes 'xpos', 'ypos', 'width', and
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'height' - and the name of the tapped key as 'key' attribute.
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:<transform>:
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Transforms touch and absolute-motion event coordinates by a sequence of
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the following primitives expressed as sub-nodes.
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:<translate>:
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Moves coordinates by 'x' and 'y' attributes.
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:<scale>:
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Scales horizontal and vertical axis by 'x' and 'y' attributes.
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:<rotate>:
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Rotates clockwise (around origin (0,0) by 90, 180, or 270 degrees in
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attribute 'angle'.
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:<reorient>:
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Rotates clockwise (like 'rotate') but also translates results for
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desired target 'width' and 'height' attributes.
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:<hflip>/<vflip>:
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Flip coordinates horizontally/vertically and translate into
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'width'/'height'.
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Character generator rules
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-------------------------
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202
repos/os/src/server/event_filter/affine_transform.h
Normal file
202
repos/os/src/server/event_filter/affine_transform.h
Normal file
@ -0,0 +1,202 @@
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/*
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* \brief Affine transform of 2-D coordinates
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* \author Christian Helmuth
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* \date 2024-01-28
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*
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* Affine transformation of coordinate (vector) x to y is the combination of
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* two operations.
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*
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* - linear map - matrix multiplication (A)
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* - translation - vector addition (b)
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*
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* y = A*x + b
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*
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* Both operations can be combined by using an augmented matrix that includes
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* the translation vector. A sequence of transformations can be combined into a
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* single transformation matrix by multiplication of respective matrices.
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*/
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/*
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* Copyright (C) 2024 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _EVENT_FILTER__AFFINE_TRANSFORM_H_
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#define _EVENT_FILTER__AFFINE_TRANSFORM_H_
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namespace Transform {
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struct Matrix;
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struct Point;
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enum Angle { ANGLE_0, ANGLE_90, ANGLE_180, ANGLE_270 };
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static Angle angle_from_degrees(unsigned degrees)
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{
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switch (degrees) {
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case 90: return ANGLE_90;
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case 180: return ANGLE_180;
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case 270: return ANGLE_270;
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default: return ANGLE_0;
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}
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}
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}
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/*
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* Augmented transformation matrix
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*
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* | v11 v12 v13 |
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* | v21 v22 v23 |
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* | 0 0 1 |
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*/
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struct Transform::Matrix
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{
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float v11, v12, v13,
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v21, v22, v23;
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/*
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* Identity transform (initial matrix)
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*/
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static Matrix identity()
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{
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return { .v11 = 1, .v12 = 0, .v13 = 0,
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.v21 = 0, .v22 = 1, .v23 = 0 };
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}
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Matrix mul(Matrix const &t) const
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{
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return {
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.v11 = t.v11 * v11 + t.v12 * v21 + t.v13 * 0,
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.v12 = t.v11 * v12 + t.v12 * v22 + t.v13 * 0,
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.v13 = t.v11 * v13 + t.v12 * v23 + t.v13 * 1,
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.v21 = t.v21 * v11 + t.v22 * v21 + t.v23 * 0,
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.v22 = t.v21 * v12 + t.v22 * v22 + t.v23 * 0,
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.v23 = t.v21 * v13 + t.v22 * v23 + t.v23 * 1
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};
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}
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/*
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* Translation by (x,y)
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*/
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Matrix translate(float x, float y) const
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{
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return mul(Matrix { 1, 0, x,
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0, 1, y});
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}
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/*
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* Scaling by (x,y)
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*/
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Matrix scale(float x, float y) const
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{
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return mul(Matrix { x, 0, 0,
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0, y, 0});
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}
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/*
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* Rotation clock-wise by 90, 180, 270 degrees
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*/
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Matrix rotate(Angle angle) const
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{
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/*
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* 90° 180° 270°
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* cos 0 -1 0
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* sin 1 0 -1
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*/
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switch (angle) {
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case ANGLE_90:
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return mul(Matrix { 0, -1, 0,
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1, 0, 0 });
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case ANGLE_180:
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return mul(Matrix { -1, 0, 0,
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0, -1, 0 });
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case ANGLE_270:
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return mul(Matrix { 0, 1, 0,
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-1, 0, 0 });
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default:
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return *this;
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}
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}
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/*
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* Reflection on (vertical) y-axis
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*/
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Matrix reflect_vertical_axis() const
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{
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return mul(Matrix { -1, 0, 0,
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0, 1, 0});
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}
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/*
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* Reflection on (horizontal) x-axis
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*/
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Matrix reflect_horizontal_axis() const
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{
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return mul(Matrix { 1, 0, 0,
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0, -1, 0});
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}
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/*
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* Rotate and adjust origin
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*/
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Matrix reorient(Angle angle, float width, float height) const
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{
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switch (angle) {
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case ANGLE_90: return rotate(angle).translate(width - 1, 0);
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case ANGLE_180: return rotate(angle).translate(width - 1, height - 1);
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case ANGLE_270: return rotate(angle).translate(0, height - 1);
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default: return *this;
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}
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}
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/*
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* Flip (in vertical direction) and adjust origin
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*/
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Matrix vflip(float height) const
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{
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return reflect_horizontal_axis().translate(0, height - 1);
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}
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/*
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* Flip (in horizontal direction) and adjust origin
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*/
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Matrix hflip(float width) const
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{
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return reflect_vertical_axis().translate(width - 1, 0);
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}
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};
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/*
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* Point as augmented vector
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*
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* | x |
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* | y |
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* | 1 |
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*/
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struct Transform::Point
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{
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float x, y;
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Point transform(Matrix const &t) const
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{
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return {
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.x = t.v11 * x + t.v12 * y + t.v13,
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.y = t.v21 * x + t.v22 * y + t.v23,
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};
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}
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int int_x() const
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{
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return x >= 0 ? int(x + 0.5) : -int(-x + 0.5);
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}
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int int_y() const
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{
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return y >= 0 ? int(y + 0.5) : -int(-y + 0.5);
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}
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};
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#endif /* _EVENT_FILTER__AFFINE_TRANSFORM_H_ */
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@ -27,6 +27,7 @@
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#include <log_source.h>
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#include <touch_click_source.h>
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#include <touch_key_source.h>
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#include <transform_source.h>
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#include <event_session.h>
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namespace Event_filter { struct Main; }
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@ -252,6 +253,9 @@ struct Event_filter::Main : Source::Factory, Source::Trigger
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if (node.type() == Log_source::name())
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return *new (_heap) Log_source(owner, node, *this);
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if (node.type() == Transform_source::name())
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return *new (_heap) Transform_source(owner, node, *this);
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if (node.type() == Touch_click_source::name())
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return *new (_heap) Touch_click_source(owner, node, *this);
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@ -48,6 +48,7 @@ class Event_filter::Source
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|| node.type() == "button-scroll"
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|| node.type() == "accelerate"
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|| node.type() == "log"
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|| node.type() == "transform"
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|| node.type() == "touch-click"
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|| node.type() == "touch-key";
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141
repos/os/src/server/event_filter/transform_source.h
Normal file
141
repos/os/src/server/event_filter/transform_source.h
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@ -0,0 +1,141 @@
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/*
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* \brief Input-event source that transforms motion events
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* \author Christian Helmuth
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* \date 2024-01-28
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*
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* This filter configurably transforms touch and absolute-motion event
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* coordinates by a sequence of translation, scaling, rotation, and flipping
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* primitives.
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*/
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/*
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* Copyright (C) 2024 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _EVENT_FILTER__TRANSFORM_SOURCE_H_
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#define _EVENT_FILTER__TRANSFORM_SOURCE_H_
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/* local includes */
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#include <source.h>
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#include <affine_transform.h>
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namespace Event_filter { class Transform_source; }
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class Event_filter::Transform_source : public Source, Source::Filter
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{
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private:
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Owner _owner;
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Source &_source;
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Transform::Matrix _transform = Transform::Matrix::identity();
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void _apply_config(Xml_node const config)
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{
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config.for_each_sub_node([&] (Xml_node node) {
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if (node.has_type("translate")) {
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_transform = _transform.translate(
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float(node.attribute_value("x", 0.0)),
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float(node.attribute_value("y", 0.0)));
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return;
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}
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if (node.has_type("scale")) {
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_transform = _transform.scale(
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float(node.attribute_value("x", 1.0)),
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float(node.attribute_value("y", 1.0)));
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return;
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}
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if (node.has_type("rotate")) {
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unsigned degrees = node.attribute_value("angle", 0);
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Transform::Angle angle =
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Transform::angle_from_degrees(degrees);
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if (angle == Transform::ANGLE_0)
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warning("invalid transform rotate(", degrees, ")");
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else
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_transform = _transform.rotate(angle);
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return;
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}
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if (node.has_type("hflip")) {
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float width = float(node.attribute_value("width", -1.0));
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if (width <= 0)
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warning("invalid transform hflip");
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else
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_transform = _transform.hflip(width);
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return;
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}
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if (node.has_type("vflip")) {
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float height = float(node.attribute_value("height", -1.0));
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if (height <= 0)
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warning("invalid transform vflip");
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else
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_transform = _transform.vflip(height);
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return;
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}
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if (node.has_type("reorient")) {
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float width = float(node.attribute_value("width", -1.0));
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float height = float(node.attribute_value("height", -1.0));
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unsigned degrees = node.attribute_value("angle", 0);
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Transform::Angle angle =
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Transform::angle_from_degrees(degrees);
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if (width <= 0 || height <= 0 || angle == Transform::ANGLE_0)
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warning("invalid transform reorient");
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else
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_transform = _transform.reorient(angle, width, height);
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return;
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}
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});
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}
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/**
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* Filter interface
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*/
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void filter_event(Sink &destination, Input::Event const &event) override
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{
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if (!event.absolute_motion() && !event.touch()) {
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destination.submit(event);
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return;
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}
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event.handle_touch([&] (Input::Touch_id id, float x, float y) {
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Transform::Point p { x, y };
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p = p.transform(_transform);
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destination.submit(Input::Touch { id, p.x, p.y });
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});
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event.handle_absolute_motion([&] (int x, int y) {
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Transform::Point p { float(x), float(y) };
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p = p.transform(_transform);
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destination.submit(Input::Absolute_motion { p.int_x(), p.int_y() });
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});
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}
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public:
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static char const *name() { return "transform"; }
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Transform_source(Owner &owner, Xml_node config, Source::Factory &factory)
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:
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Source(owner),
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_owner(factory),
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_source(factory.create_source(_owner, input_sub_node(config)))
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{
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_apply_config(config);
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}
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void generate(Sink &destination) override
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{
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Source::Filter::apply(destination, *this, _source);
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}
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};
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#endif /* _EVENT_FILTER__TRANSFORM_SOURCE_H_ */
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