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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;
- 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);
- }
- }
-
- 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 = 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].x = motion.x;
- quad.p[quad.active].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.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 = -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;
- }
-
- 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]));
- }
- }
-
- 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" &&
- File::sscanf (words[2], "%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;
- 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));
- printf ("fixed:\n");
- m_print_fix (m_i);
- }
- }
-
- &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], 0),
- Box::widget_item (label[1], 0),
- Box::widget_item (label[2], 0),
- Box::widget_item (&space, 0),
- Box::widget_item (&quad, 1));
- Nichrome::set_box (&nichrome, &box);
- Nichrome::main_loop (&nichrome);
- }
-
- main ();
-