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#!/usr/bin/env nickle /* * Copyright © 2008 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ autoload Process; autoload Nichrome; autoload Nichrome::Box; autoload Nichrome::Label; autoload Nichrome::Button; extend namespace Nichrome { public namespace Quad { public typedef quad_t; public typedef widget_t + struct { point_t[4] p; real line_width; real corner_diameter; rgba_color_t line_color; rgba_color_t corner_color; bool down; bool started; int active_corner; void(&quad_t) callback; } quad_t; protected void outline (cairo_t cr, &quad_t quad) { for (int i = 0; i < dim (quad.p); i++) { arc (cr, quad.p[i].x, quad.p[i].y, quad.corner_diameter / 2, 0, 2 * pi); close_path (cr); } } protected void natural (cairo_t cr, &quad_t quad) { rectangle (cr, 0, 0, 400, 300); } void text_at (cairo_t cr, point_t p, string text) { text_extents_t e = text_extents (cr, text); p.x = p.x - e.width / 2 - e.x_bearing; p.y = p.y - e.height / 2 - e.y_bearing; move_to (cr, p.x, p.y); show_text (cr, text); } protected void draw (cairo_t cr, &quad_t quad) { if (!quad.started) { quad.p[2].x = quad.p[1].x = quad.geometry.width; quad.p[3].y = quad.p[2].y = quad.geometry.height; quad.started = true; } rectangle (cr, 0, 0, quad.geometry.width, quad.geometry.height); set_source_rgba (cr, 0, 0, 0, .25); fill (cr); for (int i = 0; i < dim (quad.p); i++) line_to (cr, quad.p[i].x, quad.p[i].y); close_path (cr); set_line_width (cr, quad.line_width); set_source_rgba (cr, quad.line_color.red, quad.line_color.green, quad.line_color.blue, quad.line_color.alpha); set_line_join (cr, line_join_t.ROUND); stroke (cr); set_source_rgba (cr, quad.corner_color.red, quad.corner_color.green, quad.corner_color.blue, quad.corner_color.alpha); outline (cr, &quad); fill (cr); set_source_rgba (cr, 1, 1, 1, 1); for (int i = 0; i < dim (quad.p); i++) text_at (cr, quad.p[i], sprintf ("%d", i)); } int nearest (&quad_t quad, point_t p) { real best_dist2 = 0; int best = 0; for (int i = 0; i < dim (quad.p); i++) { real dist2 = ((p.x - quad.p[i].x) ** 2 + (p.y - quad.p[i].y) ** 2); if (i == 0 || dist2 < best_dist2) { best_dist2 = dist2; best = i; } } return best; } protected void button (&quad_t quad, &button_event_t event) { enum switch (event.type) { case press: quad.down = true; quad.active_corner = nearest (&quad, event); break; case release: quad.down = false; break; default: break; } } protected void motion (&quad_t quad, &motion_event_t motion) { if (quad.down) { motion.x = max (0, min (quad.geometry.width, motion.x)); motion.y = max (0, min (quad.geometry.height, motion.y)); quad.p[quad.active_corner].x = motion.x; quad.p[quad.active_corner].y = motion.y; quad.callback (&quad); Widget::reoutline (&quad); Widget::redraw (&quad); } } protected void configure (&quad_t quad, rect_t geometry) { if (quad.geometry.width > 0 && quad.geometry.height > 0) { real x_scale = geometry.width / quad.geometry.width; real y_scale = geometry.height / quad.geometry.height; for (int i = 0; i< 4; i++) { quad.p[i].x *= x_scale; quad.p[i].y *= y_scale; } } Widget::configure (&quad, geometry); quad.callback (&quad); } protected void init (&quad_t quad, &nichrome_t nichrome, void (&quad_t) callback) { Widget::init (&nichrome, &quad); quad.outline = outline; quad.draw = draw; quad.button = button; quad.motion = motion; quad.configure = configure; quad.natural = natural; quad.p = (point_t[4]) { { x = 0, y = 0 } ... }; quad.line_color = (rgba_color_t) { red = 1, green = 0, blue = 0, alpha = .5 }; quad.line_width = 10; quad.corner_color = (rgba_color_t) { red = 0, green = 0, blue = 1, alpha = 0.75 }; quad.corner_diameter = 20; quad.down = false; quad.active_corner = -1; quad.callback = callback; quad.started = false; } protected *quad_t new (&nichrome_t nichrome, void(&quad_t) callback) { quad_t quad; init (&quad, &nichrome, callback); return &quad; } } } import Nichrome; import Nichrome::Box; import Nichrome::Label; import Nichrome::Button; import Nichrome::Quad; import Cairo; typedef real[3,3] m_t; typedef point_t[4] q_t; /* * Ok, given an source quad and a dest rectangle, compute * a transform that maps the rectangle to q. That's easier * as the rectangle has some nice simple properties. Invert * the matrix to find the opposite mapping * * q0 q1 * * q3 q2 * * | m00 m01 m02 | * | m10 m11 m12 | * | m20 m21 m22 | * * m [ 0 0 1 ] = q[0] * * Set m22 to 1, and solve: * * | m02 , m12 , 1 | = | q0x, q0y, 1 | * * | m00 * w + q0x m10 * w + q0y | * | ------------- , ------------- , 1 | = | q1x, q1y, 1 | * | m20 * w + 1 m20 * w + 1 | * m00*w + q0x = q1x*(m20*w + 1) * m00 = m20*q1x + (q1x - q0x) / w; * * m10*w + q0y = q1y*(m20*w + 1) * m10 = m20*q1y + (q1y - q0y) / w; * * m01*h + q0x = q3x*(m21*h + 1) * m01 = m21*q3x + (q3x - q0x) / h; * * m11*h + q0y = q3y*(m21*h + 1) * m11 = m21*q3y + (q3y - q0y) / h * * m00*w + m01*h + q0x = q2x*(m20*w + m21*h + 1) * * m20*q1x*w + q1x - q0x + m21*q3x*h + q3x - q0x + q0x = m20*q2x*w + m21*q2x*h + q2x * * m20*q1x*w - m20*q2x*w = m21*q2x*h - m21*q3x*h + q2x - q1x + q0x - q3x + q0x - q0x * * m20*(q1x - q2x)*w = m21*(q2x - q3x)*h + q2x - q1x - q3x + q0x * * * m10*w + m11*h + q0y = q2y*(m20*w + m21*h + 1) * * m20*q1y*w + q1y - q0y + m21*q3y*h + q3y - q0y + q0y = m20*q2y*w + m21*q2y*h + q2y * * m20*q1y*w - m20*q2y*w = m21*q2y*h - m21*q3y*h + q2y - q1y + q0y - q3y + q0y - q0y * * m20*(q1y - q2y)*w = m21*(q2y - q3y)*h + q2y - q1y - q3y + q0y * * * m20*(q1x - q2x)*(q1y - q2y)*w = m21*(q2x - q3x)*(q1y - q2y)*h + (q2x - q1x - q3x + q0x)*(q1y - q2y) * * m20*(q1y - q2y)*(q1x - q2x)*w = m21*(q2y - q3y)*(q1x - q2x)*h + (q2y - q1y - q3y + q0y)*(q1x - q2x) * * 0 = m21*((q2x - q3x)*(q1y - q2y) - (q2y - q3y)*(q1x - q2x))*h + (stuff) * = m21 * a + b; * * m21 = -(stuff) / (other stuff) * * m20 = f(m21) * * m00 = f(m20) * m10 = f(m20) * * m01 = f(m21) * m11 = f(m21) * * done. */ m_t solve (q_t q, real w, real h) { real q0x = q[0].x, q0y = q[0].y; real q1x = q[1].x, q1y = q[1].y; real q2x = q[2].x, q2y = q[2].y; real q3x = q[3].x, q3y = q[3].y; real m00, m01, m02; real m10, m11, m12; real m20, m21, m22; m02 = q0x; m12 = q0y; m22 = 1; real a = ((q2x - q3x)*(q1y - q2y) - (q2y - q3y)*(q1x - q2x)) * h; real b = (q2x - q1x - q3x + q0x) * (q1y - q2y) - (q2y - q1y - q3y + q0y) * (q1x - q2x); m21 = - b / a; if (q1x != q2x) m20 = (m21 * (q2x - q3x) * h + q2x - q1x - q3x + q0x) / ((q1x - q2x) * w); else m20 = (m21 * (q2y - q3y) * h + q2y - q1y - q3y + q0y) / ((q1y - q2y) * w); m00 = m20 * q1x + (q1x - q0x) / w; m10 = m20 * q1y + (q1y - q0y) / w; m01 = m21 * q3x + (q3x - q0x) / h; m11 = m21 * q3y + (q3y - q0y) / h; return (m_t) { { m00, m01, m02 }, { m10, m11, m12 }, { m20, m21, m22 } }; } m_t invert (m_t m) { real det; int i, j; m_t r; static int[3] a = { 2, 2, 1 }; static int[3] b = { 1, 0, 0 }; det = 0; for (i = 0; i < 3; i++) { real p; int ai = a[i]; int bi = b[i]; p = m[i,0] * (m[ai,2] * m[bi,1] - m[ai,1] * m[bi,2]); if (i == 1) p = -p; det += p; } det = 1/det; for (j = 0; j < 3; j++) { for (i = 0; i < 3; i++) { real p; int ai = a[i]; int aj = a[j]; int bi = b[i]; int bj = b[j]; p = m[ai,aj] * m[bi,bj] - m[ai,bj] * m[bi,aj]; if (((i + j) & 1) != 0) p = -p; r[j,i] = det * p; } } return r; } m_t rescale (m_t m, real limit) { real max = 0; for (int j = 0; j < 3; j++) for (int i = 0; i < 3; i++) if ((real v = abs (m[j,i])) > max) max = v; real scale = limit / max; for (int j = 0; j < 3; j++) for (int i = 0; i < 3; i++) m[j,i] *= scale; return m; } string m_print (m_t m) { return sprintf ("%.8f,%.8f,%.8f,%.8f,%.8f,%.8f,%.8f,%.8f,%.8f", m[0,0],m[0,1],m[0,2], m[1,0],m[1,1],m[1,2], m[2,0],m[2,1],m[2,2]); /* return sprintf ("%v,%v,%v,%v,%v,%v,%v,%v,%v", m[0,0],m[0,1],m[0,2], m[1,0],m[1,1],m[1,2], m[2,0],m[2,1],m[2,2]); */ } int fixed (real x) { return floor (x * 65536 + 0.5) & 0xffffffff; } m_t to_fixed(m_t m) { m_t r; for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++) r[i,j] = floor(m[i,j] * 65536 + 0.5) / 65536; return r; } m_t error(m_t r, m_t f) { m_t e; for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++) { real diff = abs(r[i,j] - f[i,j]); if (r[i,j] != 0) e[i,j] = diff / abs(r[i,j]); else e[i,j] = 0; } return e; } void m_print_fix (m_t m) { for (int i = 0; i < 3; i++) { printf (" { 0x%08x, 0x%08x, 0x%08x },\n", fixed (m[i,0]), fixed (m[i,1]), fixed (m[i,2])); } } real[2] map(m_t m, real x, real y) { real[3] in = { x, y, 1 }; real[3] out = { 0 ... }; for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) out[i] += m[i,j] * in[j]; } return (real[2]) { out[0] / out[2], out[1]/ out[2] }; } real position_error(m_t r, m_t f, real x, real y) { real[2] p_r = map(r, x, y); real[2] p_f = map(f, x, y); real error; error = sqrt((p_r[0] - p_f[0]) ** 2 + (p_r[1] - p_f[1]) ** 2); printf ("x: %g y: %g error %g\n", x, y, error); printf ("\treal x: %g y: %g\n", p_r[0], p_r[1]); printf ("\tfix x: %g y: %g\n", p_f[0], p_f[1]); return error; } real max_error(m_t r, m_t f) { real max = 0, max_x = 0, max_y = 0; for (int x = 0; x <= 2560; x += 2560) for (int y = 0; y <= 1600; y += 1600) { real error = position_error(r, f, x, y); if (error > max) { max = error; max_x = x; max_y = y; } } printf ("max error %g at %d, %d\n", max, max_x, max_y); real[2] p_r = map(r, max_x ,max_y); real[2] p_f = map(f, max_x, max_y); printf ("\tdesired %7.2f, %7.2f actual %7.2f, %7.2f\n", p_r[0], p_r[1], p_f[0], p_f[1]); return max; } string m_row (m_t m, int row) { return sprintf ("%10.5f %10.5f %10.5f", m[row,0],m[row,1],m[row,2]); } Cairo::point_t[*] scale(Cairo::point_t[*] p, real w, real h) { for (int i = 0; i < dim (p); i++) { p[i].x *= w; p[i].y *= h; } return p; } typedef struct { string name; rect_t geometry; } output_t; autoload Process; output_t[*] get_outputs () { output_t[...] outputs = {}; twixt (file randr = Process::popen (Process::popen_direction.read, false, "xrandr", "xrandr"); File::close (randr)) { while (!File::end (randr)) { string[*] words = String::wordsplit (File::fgets (randr), " "); if (dim (words) >= 3 && words[1] == "connected") { int geom = 2; if (words[geom] == "primary") geom++; if (File::sscanf (words[geom], "%dx%d+%d+%d", &(int width), &(int height), &(int x), &(int y)) == 4) { outputs[dim(outputs)] = (output_t) { name = words[0], geometry = { x = x, y = y, width = width, height = height } }; } } } } return outputs; } void main () { m_t m = { { 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 } }, m_i, m_r, m_f, m_e; bool m_available = true; output_t[*] outputs = get_outputs (); output_t target_output; if (dim (outputs) == 0) { File::fprintf (stderr, "%s: No enabled outputs\n", argv[0]); exit (1); } if (dim (argv) > 1) { int i; for (i = 0; i < dim (outputs); i++) if (argv[1] == outputs[i].name) { target_output = outputs[i]; break; } if (i == dim (outputs)) { File::fprintf (stderr, "%s: no enabled output \"%s\"\n", argv[0], argv[1]); exit (1); } } else target_output = outputs[0]; real target_width = target_output.geometry.width; real target_height = target_output.geometry.height; real screen_width = 0; real screen_height = 0; for (int i = 0; i < dim (outputs); i++) { screen_width = max (screen_width, outputs[i].geometry.x + outputs[i].geometry.width); screen_height = max (screen_height, outputs[i].geometry.y + outputs[i].geometry.height); } &nichrome_t nichrome = Nichrome::new ("Keystone Correction", 400, 350); (*label_t)[3] label; &label_t space = Label::new (&nichrome, ""); for (int i = 0; i < 3; i++) { label[i] = Label::new (&nichrome, "matrix"); label[i]->font = "sans-9"; } void callback (&quad_t quad) { real w = quad.geometry.width; real h = quad.geometry.height; string[3] text; try { m = solve (scale (quad.p, target_width / w, target_height / h), target_width, target_height); m_i = invert (m); m_r = rescale (m_i, 16384); for (int i = 0; i < 3; i++) text[i] = m_row (m_i,i); m_available = true; } catch divide_by_zero (real a, real b) { text = (string[3]) { "no solution", "" ... }; m_available = false; } for (int i = 0; i < 3; i++) Label::relabel (label[i], text[i]); } &quad_t quad = Quad::new (&nichrome, callback); void doit_func (&widget_t widget, bool state) { if (m_available) { Process::system ("xrandr", "xrandr", "--fb", sprintf ("%dx%d", screen_width, screen_height), "--output", target_output.name, "--transform", m_print (m_r)); } } &button_t doit = Button::new (&nichrome, "doit", doit_func); void show_func (&widget_t widget, bool state) { if (m_available) { printf ("normal: %s\n", m_print (m)); printf ("inverse: %s\n", m_print (m_i)); printf ("scaled: %s\n", m_print (m_r)); m_f = to_fixed(m_r); printf ("round: %s\n", m_print(m_f)); printf ("fixed:\n"); m_print_fix (m_i); m_e = error(m_r, m_f); printf ("error: %s\n", m_print (m_e)); max_error(m_r, m_f); } } &button_t show = Button::new (&nichrome, "show", show_func); &button_t quit = Button::new (&nichrome, "quit", void func (&widget_t w, bool state) { w.nichrome.running = false; }); &box_t hbox = Box::new (Box::dir_t.horizontal, Box::widget_item (&doit, 0), Box::widget_item (&show, 0), Box::widget_item (&quit, 0), Box::glue_item (1)); &box_t box = Box::new (Box::dir_t.vertical, Box::box_item (&hbox), Box::widget_item (label[0], 1, 0), Box::widget_item (label[1], 1, 0), Box::widget_item (label[2], 1, 0), Box::widget_item (&space, 1, 0), Box::widget_item (&quad, 1)); Nichrome::set_box (&nichrome, &box); Nichrome::main_loop (&nichrome); } main ();