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Update CONTRIBUTING.md

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Drew DeVault 2015-11-27 09:18:46 -05:00
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CONTRIBUTING.md
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@ -9,7 +9,8 @@ your plans.
Sway is written in C. The style guidelines is [kernel Sway is written in C. The style guidelines is [kernel
style](https://www.kernel.org/doc/Documentation/CodingStyle), but all braces go style](https://www.kernel.org/doc/Documentation/CodingStyle), but all braces go
on the same line (*"but K&R!" is silly*). Some points to note: on the same line (*"but K&R says so!" is a silly to justify something*). Some
points to note:
* Do not use typedefs unless you have a good reason * Do not use typedefs unless you have a good reason
* Do not use macros unless you have a *really* good reason * Do not use macros unless you have a *really* good reason
@ -19,6 +20,8 @@ on the same line (*"but K&R!" is silly*). Some points to note:
* Use logging with reckless abandon * Use logging with reckless abandon
* Always include braces for if/for/while/etc, even for one-liners * Always include braces for if/for/while/etc, even for one-liners
An example of well formatted code:
```C ```C
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
@ -26,133 +29,133 @@ on the same line (*"but K&R!" is silly*). Some points to note:
#include "example.h" #include "example.h"
struct foobar { struct foobar {
char *foo; char *foo;
int bar; int bar;
long baz; long baz;
}; // Do not typedef without a good reason }; // Do not typedef without a good reason
int main(int argc, const char **argv) { int main(int argc, const char **argv) {
if (argc != 4) { if (argc != 4) {
sway_abort("Do not run this program manually. See man 5 sway and look for output options."); sway_abort("Do not run this program manually. See man 5 sway and look for output options.");
} }
if (!registry->desktop_shell) { if (!registry->desktop_shell) {
sway_abort("swaybg requires the compositor to support the desktop-shell extension."); sway_abort("swaybg requires the compositor to support the desktop-shell extension.");
} }
int desired_output = atoi(argv[1]); int desired_output = atoi(argv[1]);
sway_log(L_INFO, "Using output %d of %d", desired_output, registry->outputs->length); sway_log(L_INFO, "Using output %d of %d", desired_output, registry->outputs->length);
int i; int i;
struct output_state *output = registry->outputs->items[desired_output]; struct output_state *output = registry->outputs->items[desired_output];
struct window *window = window_setup(registry, 100, 100, false); struct window *window = window_setup(registry, 100, 100, false);
if (!window) { if (!window) {
sway_abort("Failed to create surfaces."); sway_abort("Failed to create surfaces.");
} }
window->width = output->width; window->width = output->width;
window->height = output->height; window->height = output->height;
desktop_shell_set_background(registry->desktop_shell, output->output, window->surface); desktop_shell_set_background(registry->desktop_shell, output->output, window->surface);
list_add(surfaces, window); list_add(surfaces, window);
cairo_surface_t *image = cairo_image_surface_create_from_png(argv[2]); cairo_surface_t *image = cairo_image_surface_create_from_png(argv[2]);
double width = cairo_image_surface_get_width(image); double width = cairo_image_surface_get_width(image);
double height = cairo_image_surface_get_height(image); double height = cairo_image_surface_get_height(image);
const char *scaling_mode_str = argv[3]; const char *scaling_mode_str = argv[3];
enum scaling_mode scaling_mode; enum scaling_mode scaling_mode;
if (strcmp(scaling_mode_str, "stretch") == 0) { if (strcmp(scaling_mode_str, "stretch") == 0) {
scaling_mode = SCALING_MODE_STRETCH; scaling_mode = SCALING_MODE_STRETCH;
} else if (strcmp(scaling_mode_str, "fill") == 0) { } else if (strcmp(scaling_mode_str, "fill") == 0) {
scaling_mode = SCALING_MODE_FILL; scaling_mode = SCALING_MODE_FILL;
} else if (strcmp(scaling_mode_str, "fit") == 0) { } else if (strcmp(scaling_mode_str, "fit") == 0) {
scaling_mode = SCALING_MODE_FIT; scaling_mode = SCALING_MODE_FIT;
} else if (strcmp(scaling_mode_str, "center") == 0) { } else if (strcmp(scaling_mode_str, "center") == 0) {
scaling_mode = SCALING_MODE_CENTER; scaling_mode = SCALING_MODE_CENTER;
} else if (strcmp(scaling_mode_str, "tile") == 0) { } else if (strcmp(scaling_mode_str, "tile") == 0) {
scaling_mode = SCALING_MODE_TILE; scaling_mode = SCALING_MODE_TILE;
} else { } else {
sway_abort("Unsupported scaling mode: %s", scaling_mode_str); sway_abort("Unsupported scaling mode: %s", scaling_mode_str);
} }
for (i = 0; i < surfaces->length; ++i) { for (i = 0; i < surfaces->length; ++i) {
struct window *window = surfaces->items[i]; struct window *window = surfaces->items[i];
if (window_prerender(window) && window->cairo) { if (window_prerender(window) && window->cairo) {
switch (scaling_mode) { switch (scaling_mode) {
case SCALING_MODE_STRETCH: case SCALING_MODE_STRETCH:
cairo_scale(window->cairo, cairo_scale(window->cairo,
(double) window->width / width, (double) window->width / width,
(double) window->height / height); (double) window->height / height);
cairo_set_source_surface(window->cairo, image, 0, 0); cairo_set_source_surface(window->cairo, image, 0, 0);
break; break;
case SCALING_MODE_FILL: case SCALING_MODE_FILL:
{ {
double window_ratio = (double) window->width / window->height; double window_ratio = (double) window->width / window->height;
double bg_ratio = width / height; double bg_ratio = width / height;
if (window_ratio > bg_ratio) { if (window_ratio > bg_ratio) {
double scale = (double) window->width / width; double scale = (double) window->width / width;
cairo_scale(window->cairo, scale, scale); cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image, cairo_set_source_surface(window->cairo, image,
0, 0,
(double) window->height/2 / scale - height/2); (double) window->height/2 / scale - height/2);
} else { } else {
double scale = (double) window->height / height; double scale = (double) window->height / height;
cairo_scale(window->cairo, scale, scale); cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image, cairo_set_source_surface(window->cairo, image,
(double) window->width/2 / scale - width/2, (double) window->width/2 / scale - width/2,
0); 0);
} }
} }
break; break;
case SCALING_MODE_FIT: case SCALING_MODE_FIT:
{ {
double window_ratio = (double) window->width / window->height; double window_ratio = (double) window->width / window->height;
double bg_ratio = width / height; double bg_ratio = width / height;
if (window_ratio > bg_ratio) { if (window_ratio > bg_ratio) {
double scale = (double) window->height / height; double scale = (double) window->height / height;
cairo_scale(window->cairo, scale, scale); cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image, cairo_set_source_surface(window->cairo, image,
(double) window->width/2 / scale - width/2, (double) window->width/2 / scale - width/2,
0); 0);
} else { } else {
double scale = (double) window->width / width; double scale = (double) window->width / width;
cairo_scale(window->cairo, scale, scale); cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image, cairo_set_source_surface(window->cairo, image,
0, 0,
(double) window->height/2 / scale - height/2); (double) window->height/2 / scale - height/2);
} }
} }
break; break;
case SCALING_MODE_CENTER: case SCALING_MODE_CENTER:
cairo_set_source_surface(window->cairo, image, cairo_set_source_surface(window->cairo, image,
(double) window->width/2 - width/2, (double) window->width/2 - width/2,
(double) window->height/2 - height/2); (double) window->height/2 - height/2);
break; break;
case SCALING_MODE_TILE: case SCALING_MODE_TILE:
{ {
cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image); cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT); cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
cairo_set_source(window->cairo, pattern); cairo_set_source(window->cairo, pattern);
} }
break; break;
default: default:
sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str); sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str);
} }
cairo_paint(window->cairo); cairo_paint(window->cairo);
window_render(window); window_render(window);
} }
} }
while (wl_display_dispatch(registry->display) != -1); while (wl_display_dispatch(registry->display) != -1);
for (i = 0; i < surfaces->length; ++i) { for (i = 0; i < surfaces->length; ++i) {
struct window *window = surfaces->items[i]; struct window *window = surfaces->items[i];
window_teardown(window); window_teardown(window);
} }
list_free(surfaces); list_free(surfaces);
registry_teardown(registry); registry_teardown(registry);
return 0; return 0;
} }
``` ```