Scott Anderson
8 years ago
commit
382f712792
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# Contributing to wlroots
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Contributing just involves sending a pull request. You will probably be more
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successful with your contribution if you visit the [IRC
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channel](http://webchat.freenode.net/?channels=sway&uio=d4) upfront and discuss
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your plans.
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## Pull Requests
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If you already have your own pull request habits, feel free to use them. If you
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don't, however, allow me to make a suggestion: feature branches pulled from
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upstream. Try this:
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1. Fork sway
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2. Clone your fork
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3. git remote add upstream https://github.com/SirCmpwn/wlroots
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You only need to do this once. You're never going to use your fork's master
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branch. Instead, when you start working on a feature, do this:
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1. git fetch upstream
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2. git checkout -b add-so-and-so-feature upstream/master
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3. work
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4. git push -u origin add-so-and-so-feature
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5. Make pull request from your feature branch
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## Commit Messages
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Please strive to write good commit messages. Here's some guidelines to follow:
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The first line should be limited to 50 characters and should be a sentence that
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completes the thought [When applied, this commit will...] "Implement cmd_move"
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or "Fix #742" or "Improve performance of arrange_windows on ARM" or similar.
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The subsequent lines should be seperated from the subject line by a single
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blank line, and include optional details. In this you can give justification
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for the change, [reference Github
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issues](https://help.github.com/articles/closing-issues-via-commit-messages/),
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or explain some of the subtler details of your patch. This is important because
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when someone finds a line of code they don't understand later, they can use the
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`git blame` command to find out what the author was thinking when they wrote
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it. It's also easier to review your pull requests if they're seperated into
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logical commits that have good commit messages and justify themselves in the
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extended commit description.
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As a good rule of thumb, anything you might put into the pull request
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description on Github is probably fair game for going into the extended commit
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message as well.
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## Coding Style
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wlroots is written in C with the same style as Sway. The style guidelines is
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[kernel
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style](https://www.kernel.org/doc/Documentation/process/coding-style.rst), but
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all braces go on the same line (*"but K&R says so!" is a silly way of justifying
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something*). Some points to note:
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* Do not use typedefs unless you have a good reason
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* Do not use macros unless you have a *really* good reason
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* Align `case` with `switch`
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* Tabs, not spaces
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* `char *pointer` - note position of `*`
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* Use logging with reckless abandon
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* Always include braces for if/for/while/etc, even for one-liners
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An example of well formatted code:
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```C
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#include <stdio.h>
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#include <stdlib.h>
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#include "log.h"
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#include "example.h"
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struct foobar {
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char *foo;
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int bar;
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long baz;
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}; // Do not typedef without a good reason
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int main(int argc, const char **argv) {
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if (argc != 4) {
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sway_abort("Do not run this program manually. See man 5 sway and look for output options.");
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}
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if (!registry->desktop_shell) {
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sway_abort("swaybg requires the compositor to support the desktop-shell extension.");
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}
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int desired_output = atoi(argv[1]);
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sway_log(L_INFO, "Using output %d of %d", desired_output, registry->outputs->length);
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int i;
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struct output_state *output = registry->outputs->items[desired_output];
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struct window *window = window_setup(registry, 100, 100, false);
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if (!window) {
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sway_abort("Failed to create surfaces.");
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}
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window->width = output->width;
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window->height = output->height;
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desktop_shell_set_background(registry->desktop_shell, output->output, window->surface);
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list_add(surfaces, window);
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cairo_surface_t *image = cairo_image_surface_create_from_png(argv[2]);
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double width = cairo_image_surface_get_width(image);
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double height = cairo_image_surface_get_height(image);
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const char *scaling_mode_str = argv[3];
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enum scaling_mode scaling_mode;
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if (strcmp(scaling_mode_str, "stretch") == 0) {
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scaling_mode = SCALING_MODE_STRETCH;
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} else if (strcmp(scaling_mode_str, "fill") == 0) {
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scaling_mode = SCALING_MODE_FILL;
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} else if (strcmp(scaling_mode_str, "fit") == 0) {
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scaling_mode = SCALING_MODE_FIT;
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} else if (strcmp(scaling_mode_str, "center") == 0) {
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scaling_mode = SCALING_MODE_CENTER;
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} else if (strcmp(scaling_mode_str, "tile") == 0) {
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scaling_mode = SCALING_MODE_TILE;
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} else {
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sway_abort("Unsupported scaling mode: %s", scaling_mode_str);
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}
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for (i = 0; i < surfaces->length; ++i) {
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struct window *window = surfaces->items[i];
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if (window_prerender(window) && window->cairo) {
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switch (scaling_mode) {
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case SCALING_MODE_STRETCH:
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cairo_scale(window->cairo,
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(double) window->width / width,
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(double) window->height / height);
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cairo_set_source_surface(window->cairo, image, 0, 0);
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break;
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case SCALING_MODE_FILL:
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{
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double window_ratio = (double) window->width / window->height;
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double bg_ratio = width / height;
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if (window_ratio > bg_ratio) {
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double scale = (double) window->width / width;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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0,
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(double) window->height/2 / scale - height/2);
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} else {
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double scale = (double) window->height / height;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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(double) window->width/2 / scale - width/2,
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0);
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}
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break;
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}
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case SCALING_MODE_FIT:
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{
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double window_ratio = (double) window->width / window->height;
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double bg_ratio = width / height;
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if (window_ratio > bg_ratio) {
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double scale = (double) window->height / height;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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(double) window->width/2 / scale - width/2,
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0);
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} else {
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double scale = (double) window->width / width;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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0,
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(double) window->height/2 / scale - height/2);
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}
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break;
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}
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case SCALING_MODE_CENTER:
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cairo_set_source_surface(window->cairo, image,
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(double) window->width/2 - width/2,
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(double) window->height/2 - height/2);
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break;
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case SCALING_MODE_TILE:
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{
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cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
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cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
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cairo_set_source(window->cairo, pattern);
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break;
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}
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default:
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sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str);
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}
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cairo_paint(window->cairo);
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window_render(window);
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}
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}
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while (wl_display_dispatch(registry->display) != -1);
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for (i = 0; i < surfaces->length; ++i) {
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struct window *window = surfaces->items[i];
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window_teardown(window);
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}
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list_free(surfaces);
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registry_teardown(registry);
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return 0;
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}
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```
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@ -1,5 +1,29 @@
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# wlroots
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A set of utility libraries for Wayland compositors.
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Pluggable, composable modules for building a Wayland compositor.
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WIP
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WIP - [Status](https://github.com/SirCmpwn/wlroots/issues/9)
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## Building
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Install dependencies:
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* cmake
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* wayland
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* wayland-protocols
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* EGL
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* GLESv2
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* DRM
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* GBM
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* libinput
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* udev
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* systemd (optional, for logind support)
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* asciidoc (optional, for man pages)
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Run these commands:
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mkdir build
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cd build
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cmake -DCMAKE_BUILD_TYPE=Release ..
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make
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sudo make install
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