Merge remote-tracking branch 'upstream/master' into rotation

7 files changed, 337 insertions, 28 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 00000000..913eb279
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,204 @@
+# Contributing to wlroots
+
+Contributing just involves sending a pull request. You will probably be more
+successful with your contribution if you visit the [IRC
+channel](http://webchat.freenode.net/?channels=sway&uio=d4) upfront and discuss
+your plans.
+
+## Pull Requests
+
+If you already have your own pull request habits, feel free to use them. If you
+don't, however, allow me to make a suggestion: feature branches pulled from
+upstream. Try this:
+
+1. Fork sway
+2. Clone your fork
+3. git remote add upstream https://github.com/SirCmpwn/wlroots
+
+You only need to do this once. You're never going to use your fork's master
+branch. Instead, when you start working on a feature, do this:
+
+1. git fetch upstream
+2. git checkout -b add-so-and-so-feature upstream/master
+3. work
+4. git push -u origin add-so-and-so-feature
+5. Make pull request from your feature branch
+
+## Commit Messages
+
+Please strive to write good commit messages. Here's some guidelines to follow:
+
+The first line should be limited to 50 characters and should be a sentence that
+completes the thought [When applied, this commit will...] "Implement cmd_move"
+or "Fix #742" or "Improve performance of arrange_windows on ARM" or similar.
+
+The subsequent lines should be seperated from the subject line by a single
+blank line, and include optional details. In this you can give justification
+for the change, [reference Github
+issues](https://help.github.com/articles/closing-issues-via-commit-messages/),
+or explain some of the subtler details of your patch. This is important because
+when someone finds a line of code they don't understand later, they can use the
+`git blame` command to find out what the author was thinking when they wrote
+it. It's also easier to review your pull requests if they're seperated into
+logical commits that have good commit messages and justify themselves in the
+extended commit description.
+
+As a good rule of thumb, anything you might put into the pull request
+description on Github is probably fair game for going into the extended commit
+message as well.
+
+## Coding Style
+
+wlroots is written in C with the same style as Sway. The style guidelines is
+[kernel
+style](https://www.kernel.org/doc/Documentation/process/coding-style.rst), but
+all braces go on the same line (*"but K&R says so!" is a silly way of justifying
+something*). Some points to note:
+
+* Do not use typedefs unless you have a good reason
+* Do not use macros unless you have a *really* good reason
+* Align `case` with `switch`
+* Tabs, not spaces
+* `char *pointer` - note position of `*`
+* Use logging with reckless abandon
+* Always include braces for if/for/while/etc, even for one-liners
+
+An example of well formatted code:
+
+```C
+#include <stdio.h>
+#include <stdlib.h>
+#include "log.h"
+#include "example.h"
+
+struct foobar {
+	char *foo;
+	int bar;
+	long baz;
+}; // Do not typedef without a good reason
+
+int main(int argc, const char **argv) {
+	if (argc != 4) {
+		sway_abort("Do not run this program manually. See man 5 sway and look for output options.");
+	}
+
+	if (!registry->desktop_shell) {
+		sway_abort("swaybg requires the compositor to support the desktop-shell extension.");
+	}
+
+	int desired_output = atoi(argv[1]);
+	sway_log(L_INFO, "Using output %d of %d", desired_output, registry->outputs->length);
+	int i;
+	struct output_state *output = registry->outputs->items[desired_output];
+	struct window *window = window_setup(registry, 100, 100, false);
+	if (!window) {
+		sway_abort("Failed to create surfaces.");
+	}
+	window->width = output->width;
+	window->height = output->height;
+	desktop_shell_set_background(registry->desktop_shell, output->output, window->surface);
+	list_add(surfaces, window);
+
+	cairo_surface_t *image = cairo_image_surface_create_from_png(argv[2]);
+	double width = cairo_image_surface_get_width(image);
+	double height = cairo_image_surface_get_height(image);
+
+	const char *scaling_mode_str = argv[3];
+	enum scaling_mode scaling_mode;
+	if (strcmp(scaling_mode_str, "stretch") == 0) {
+		scaling_mode = SCALING_MODE_STRETCH;
+	} else if (strcmp(scaling_mode_str, "fill") == 0) {
+		scaling_mode = SCALING_MODE_FILL;
+	} else if (strcmp(scaling_mode_str, "fit") == 0) {
+		scaling_mode = SCALING_MODE_FIT;
+	} else if (strcmp(scaling_mode_str, "center") == 0) {
+		scaling_mode = SCALING_MODE_CENTER;
+	} else if (strcmp(scaling_mode_str, "tile") == 0) {
+		scaling_mode = SCALING_MODE_TILE;
+	} else {
+		sway_abort("Unsupported scaling mode: %s", scaling_mode_str);
+	}
+
+	for (i = 0; i < surfaces->length; ++i) {
+		struct window *window = surfaces->items[i];
+		if (window_prerender(window) && window->cairo) {
+			switch (scaling_mode) {
+			case SCALING_MODE_STRETCH:
+				cairo_scale(window->cairo,
+						(double) window->width / width,
+						(double) window->height / height);
+				cairo_set_source_surface(window->cairo, image, 0, 0);
+				break;
+			case SCALING_MODE_FILL:
+			{
+				double window_ratio = (double) window->width / window->height;
+				double bg_ratio = width / height;
+
+				if (window_ratio > bg_ratio) {
+					double scale = (double) window->width / width;
+					cairo_scale(window->cairo, scale, scale);
+					cairo_set_source_surface(window->cairo, image,
+							0,
+							(double) window->height/2 / scale - height/2);
+				} else {
+					double scale = (double) window->height / height;
+					cairo_scale(window->cairo, scale, scale);
+					cairo_set_source_surface(window->cairo, image,
+							(double) window->width/2 / scale - width/2,
+							0);
+				}
+				break;
+			}
+			case SCALING_MODE_FIT:
+			{
+				double window_ratio = (double) window->width / window->height;
+				double bg_ratio = width / height;
+
+				if (window_ratio > bg_ratio) {
+					double scale = (double) window->height / height;
+					cairo_scale(window->cairo, scale, scale);
+					cairo_set_source_surface(window->cairo, image,
+							(double) window->width/2 / scale - width/2,
+							0);
+				} else {
+					double scale = (double) window->width / width;
+					cairo_scale(window->cairo, scale, scale);
+					cairo_set_source_surface(window->cairo, image,
+							0,
+							(double) window->height/2 / scale - height/2);
+				}
+				break;
+			}
+			case SCALING_MODE_CENTER:
+				cairo_set_source_surface(window->cairo, image,
+						(double) window->width/2 - width/2,
+						(double) window->height/2 - height/2);
+				break;
+			case SCALING_MODE_TILE:
+			{
+				cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
+				cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
+				cairo_set_source(window->cairo, pattern);
+				break;
+			}
+			default:
+				sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str);
+			}
+
+			cairo_paint(window->cairo);
+
+			window_render(window);
+		}
+	}
+
+	while (wl_display_dispatch(registry->display) != -1);
+
+	for (i = 0; i < surfaces->length; ++i) {
+		struct window *window = surfaces->items[i];
+		window_teardown(window);
+	}
+	list_free(surfaces);
+	registry_teardown(registry);
+	return 0;
+}
+```
diff --git a/README.md b/README.md
index 74a2385e..75d191d4 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,29 @@
 # wlroots
 
-A set of utility libraries for Wayland compositors.
+Pluggable, composable modules for building a Wayland compositor.
 
-WIP
+WIP - [Status](https://github.com/SirCmpwn/wlroots/issues/9)
+
+## Building
+
+Install dependencies:
+
+* cmake
+* wayland
+* wayland-protocols
+* EGL
+* GLESv2
+* DRM
+* GBM
+* libinput
+* udev
+* systemd (optional, for logind support)
+* asciidoc (optional, for man pages)
+
+Run these commands:
+
+    mkdir build
+    cd build
+    cmake -DCMAKE_BUILD_TYPE=Release ..
+    make
+    sudo make install
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 6ab66033..90695175 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -150,14 +150,14 @@ static bool display_init_renderer(struct wlr_drm_renderer *renderer,
 	output->gbm = gbm_surface_create(renderer->gbm, mode->width,
 		mode->height, GBM_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
 	if (!output->gbm) {
-		wlr_log(L_ERROR, "Failed to create GBM surface for %s: %s", output->name,
+		wlr_log(L_ERROR, "Failed to create GBM surface for %s: %s", output->wlr_output->name,
 			strerror(errno));
 		return false;
 	}
 
 	output->egl = wlr_egl_create_surface(&renderer->egl, output->gbm);
 	if (output->egl == EGL_NO_SURFACE) {
-		wlr_log(L_ERROR, "Failed to create EGL surface for %s", output->name);
+		wlr_log(L_ERROR, "Failed to create EGL surface for %s", output->wlr_output->name);
 		return false;
 	}
 
@@ -205,7 +205,7 @@ static bool wlr_drm_output_set_mode(struct wlr_output_state *output,
 	struct wlr_backend_state *state =
 		wl_container_of(output->renderer, state, renderer);
 
-	wlr_log(L_INFO, "Modesetting '%s' with '%ux%u@%u mHz'", output->name,
+	wlr_log(L_INFO, "Modesetting '%s' with '%ux%u@%u mHz'", output->wlr_output->name,
 			mode->width, mode->height, mode->refresh);
 
 	drmModeConnector *conn = drmModeGetConnector(state->fd, output->connector);
@@ -215,7 +215,7 @@ static bool wlr_drm_output_set_mode(struct wlr_output_state *output,
 	}
 
 	if (conn->connection != DRM_MODE_CONNECTED || conn->count_modes == 0) {
-		wlr_log(L_ERROR, "%s is not connected", output->name);
+		wlr_log(L_ERROR, "%s is not connected", output->wlr_output->name);
 		goto error;
 	}
 
@@ -250,7 +250,7 @@ static bool wlr_drm_output_set_mode(struct wlr_output_state *output,
 	drmModeFreeResources(res);
 
 	if (!success) {
-		wlr_log(L_ERROR, "Failed to find CRTC for %s", output->name);
+		wlr_log(L_ERROR, "Failed to find CRTC for %s", output->wlr_output->name);
 		goto error;
 	}
 
@@ -260,7 +260,7 @@ static bool wlr_drm_output_set_mode(struct wlr_output_state *output,
 	output->wlr_output->current_mode = mode;
 
 	if (!display_init_renderer(&state->renderer, output)) {
-		wlr_log(L_ERROR, "Failed to initalise renderer for %s", output->name);
+		wlr_log(L_ERROR, "Failed to initalise renderer for %s", output->wlr_output->name);
 		goto error;
 	}
 
@@ -304,6 +304,87 @@ static int32_t calculate_refresh_rate(drmModeModeInfo *mode) {
 	return refresh;
 }
 
+// Constructed from http://edid.tv/manufacturer
+const char *get_manufacturer(uint16_t id) {
+#define ID(a, b, c) ((a & 0x1f) << 10) | ((b & 0x1f) << 5) | (c & 0x1f)
+	switch (id) {
+	case ID('A', 'A', 'A'): return "Avolites Ltd";
+	case ID('A', 'C', 'I'): return "Ancor Communications Inc";
+	case ID('A', 'C', 'R'): return "Acer Technologies";
+	case ID('A', 'P', 'P'): return "Apple Computer Inc";
+	case ID('B', 'N', 'O'): return "Bang & Olufsen";
+	case ID('C', 'M', 'N'): return "Chimei Innolux Corporation";
+	case ID('C', 'M', 'O'): return "Chi Mei Optoelectronics corp.";
+	case ID('C', 'R', 'O'): return "Extraordinary Technologies PTY Limited";
+	case ID('D', 'E', 'L'): return "Dell Inc.";
+	case ID('D', 'O', 'N'): return "DENON, Ltd.";
+	case ID('E', 'N', 'C'): return "Eizo Nanao Corporation";
+	case ID('E', 'P', 'H'): return "Epiphan Systems Inc.";
+	case ID('F', 'U', 'S'): return "Fujitsu Siemens Computers GmbH";
+	case ID('G', 'S', 'M'): return "Goldstar Company Ltd";
+	case ID('H', 'I', 'Q'): return "Kaohsiung Opto Electronics Americas, Inc.";
+	case ID('H', 'S', 'D'): return "HannStar Display Corp";
+	case ID('H', 'W', 'P'): return "Hewlett Packard";
+	case ID('I', 'N', 'T'): return "Interphase Corporation";
+	case ID('I', 'V', 'M'): return "Iiyama North America";
+	case ID('L', 'E', 'N'): return "Lenovo Group Limited";
+	case ID('M', 'A', 'X'): return "Rogen Tech Distribution Inc";
+	case ID('M', 'E', 'G'): return "Abeam Tech Ltd";
+	case ID('M', 'E', 'I'): return "Panasonic Industry Company";
+	case ID('M', 'T', 'C'): return "Mars-Tech Corporation";
+	case ID('M', 'T', 'X'): return "Matrox";
+	case ID('N', 'E', 'C'): return "NEC Corporation";
+	case ID('O', 'N', 'K'): return "ONKYO Corporation";
+	case ID('O', 'R', 'N'): return "ORION ELECTRIC CO., LTD.";
+	case ID('O', 'T', 'M'): return "Optoma Corporation";
+	case ID('O', 'V', 'R'): return "Oculus VR, Inc.";
+	case ID('P', 'H', 'L'): return "Philips Consumer Electronics Company";
+	case ID('P', 'I', 'O'): return "Pioneer Electronic Corporation";
+	case ID('P', 'N', 'R'): return "Planar Systems, Inc.";
+	case ID('Q', 'D', 'S'): return "Quanta Display Inc.";
+	case ID('S', 'A', 'M'): return "Samsung Electric Company";
+	case ID('S', 'E', 'C'): return "Seiko Epson Corporation";
+	case ID('S', 'H', 'P'): return "Sharp Corporation";
+	case ID('S', 'I', 'I'): return "Silicon Image, Inc.";
+	case ID('S', 'N', 'Y'): return "Sony";
+	case ID('T', 'O', 'P'): return "Orion Communications Co., Ltd.";
+	case ID('T', 'S', 'B'): return "Toshiba America Info Systems Inc";
+	case ID('T', 'S', 'T'): return "Transtream Inc";
+	case ID('U', 'N', 'K'): return "Unknown";
+	case ID('V', 'I', 'Z'): return "VIZIO, Inc";
+	case ID('V', 'S', 'C'): return "ViewSonic Corporation";
+	case ID('Y', 'M', 'H'): return "Yamaha Corporation";
+	default: return "Unknown";
+	}
+#undef ID
+}
+
+/* See https://en.wikipedia.org/wiki/Extended_Display_Identification_Data for layout of EDID data.
+ * We don't parse the EDID properly. We just expect to receive valid data.
+ */
+static void parse_edid(struct wlr_output *restrict output, const uint8_t *restrict data) {
+	uint32_t id = (data[8] << 8) | data[9];
+	snprintf(output->make, sizeof(output->make), "%s", get_manufacturer(id));
+
+	output->phys_width = ((data[68] & 0xf0) << 4) | data[66];
+	output->phys_height = ((data[68] & 0x0f) << 8) | data[67];
+
+	for (size_t i = 72; i <= 108; i += 18) {
+		uint16_t flag = (data[i] << 8) | data[i + 1];
+		if (flag == 0 && data[i + 3] == 0xFC) {
+			sprintf(output->model, "%.13s", &data[i + 5]);
+
+			// Monitor names are terminated by newline if they're too short
+			char *nl = strchr(output->model, '\n');
+			if (nl) {
+				*nl = '\0';
+			}
+
+			break;
+		}
+	}
+}
+
 static void scan_property_ids(int fd, drmModeConnector *conn,
 		struct wlr_output_state *output) {
 	for (int i = 0; i < conn->count_props; ++i) {
@@ -312,16 +393,18 @@ static void scan_property_ids(int fd, drmModeConnector *conn,
 			continue;
 		}
 
-		// I think this is guranteed to exist
 		if (strcmp(prop->name, "DPMS") == 0) {
 			output->props.dpms = prop->prop_id;
+		} else if (strcmp(prop->name, "EDID") == 0) {
+			drmModePropertyBlobRes *edid = drmModeGetPropertyBlob(fd, conn->prop_values[i]);
+			if (!edid) {
+				drmModeFreeProperty(prop);
+				continue;
+			}
 
-			/* There may be more properties we want to get,
-			 * but since it's currently only this, we exit early
-			 */
+			parse_edid(output->wlr_output, edid->data);
 
-			drmModeFreeProperty(prop);
-			break;
+			drmModeFreePropertyBlob(edid);
 		}
 
 		drmModeFreeProperty(prop);
@@ -369,8 +452,7 @@ void wlr_drm_scan_connectors(struct wlr_backend_state *state) {
 			output->connector = id;
 			// TODO: Populate more wlr_output fields
 			// TODO: Move this to wlr_output->name
-			wlr_output->name = output->name;
-			snprintf(output->name, sizeof(output->name), "%s-%"PRIu32,
+			snprintf(wlr_output->name, sizeof(wlr_output->name), "%s-%"PRIu32,
 				 conn_name[conn->connector_type],
 				 conn->connector_type_id);
 
@@ -383,7 +465,7 @@ void wlr_drm_scan_connectors(struct wlr_backend_state *state) {
 			scan_property_ids(state->fd, conn, output);
 
 			list_add(state->outputs, output);
-			wlr_log(L_INFO, "Found display '%s'", output->name);
+			wlr_log(L_INFO, "Found display '%s'", wlr_output->name);
 		} else {
 			output = state->outputs->items[index];
 			wlr_output = output->wlr_output;
@@ -393,7 +475,7 @@ void wlr_drm_scan_connectors(struct wlr_backend_state *state) {
 		if (output->state == DRM_OUTPUT_DISCONNECTED &&
 			conn->connection == DRM_MODE_CONNECTED) {
 
-			wlr_log(L_INFO, "'%s' connected", output->name);
+			wlr_log(L_INFO, "'%s' connected", output->wlr_output->name);
 			wlr_log(L_INFO, "Detected modes:");
 
 			for (int i = 0; i < conn->count_modes; ++i) {
@@ -414,12 +496,12 @@ void wlr_drm_scan_connectors(struct wlr_backend_state *state) {
 			}
 
 			output->state = DRM_OUTPUT_NEEDS_MODESET;
-			wlr_log(L_INFO, "Sending modesetting signal for '%s'", output->name);
+			wlr_log(L_INFO, "Sending modesetting signal for '%s'", output->wlr_output->name);
 			wl_signal_emit(&state->backend->events.output_add, wlr_output);
 		} else if (output->state == DRM_OUTPUT_CONNECTED &&
 			conn->connection != DRM_MODE_CONNECTED) {
 
-			wlr_log(L_INFO, "'%s' disconnected", output->name);
+			wlr_log(L_INFO, "'%s' disconnected", output->wlr_output->name);
 			wlr_drm_output_cleanup(output, false);
 		}
 
@@ -494,7 +576,7 @@ void wlr_drm_output_cleanup(struct wlr_output_state *output, bool restore) {
 		if (restore) {
 			restore_output(output, renderer->fd);
 		}
-		wlr_log(L_INFO, "Emmiting destruction signal for '%s'", output->name);
+		wlr_log(L_INFO, "Emmiting destruction signal for '%s'", output->wlr_output->name);
 		wl_signal_emit(&state->backend->events.output_remove, output->wlr_output);
 		break;
 	case DRM_OUTPUT_DISCONNECTED:
diff --git a/example/simple.c b/example/simple.c
index 1f92bbe7..21f333c7 100644
--- a/example/simple.c
+++ b/example/simple.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
+#include <inttypes.h>
 #include <wayland-server.h>
 #include <GLES3/gl3.h>
 #include <wlr/backend.h>
@@ -54,6 +55,8 @@ void output_add(struct wl_listener *listener, void *data) {
 	struct wlr_output *output = data;
 	struct state *state = wl_container_of(listener, state, output_add);
 	fprintf(stderr, "Output '%s' added\n", output->name);
+	fprintf(stderr, "%s %s %"PRId32"mm x %"PRId32"mm\n", output->make, output->model,
+		output->phys_width, output->phys_height);
 	wlr_output_set_mode(output, output->modes->items[0]);
 	struct output_state *ostate = calloc(1, sizeof(struct output_state));
 	ostate->output = output;
diff --git a/include/backend/drm/drm.h b/include/backend/drm/drm.h
index 004f3a10..2d063adb 100644
--- a/include/backend/drm/drm.h
+++ b/include/backend/drm/drm.h
@@ -34,7 +34,6 @@ struct wlr_output_state {
 	struct wlr_output *wlr_output;
 	enum wlr_drm_output_state state;
 	uint32_t connector;
-	char name[16];
 
 	struct {
 		uint32_t dpms;
diff --git a/include/wlr/types.h b/include/wlr/types.h
index 27819f56..a3afb258 100644
--- a/include/wlr/types.h
+++ b/include/wlr/types.h
@@ -22,11 +22,10 @@ struct wlr_output {
 	struct wlr_output_state *state;
 
 	uint32_t flags;
-	char *name;
-	char *make;
-	char *model;
+	char name[16];
+	char make[48];
+	char model[16];
 	uint32_t scale;
-	int32_t x, y;
 	int32_t width, height;
 	int32_t phys_width, phys_height; // mm
 	int32_t subpixel; // enum wl_output_subpixel
diff --git a/types/wlr_output.c b/types/wlr_output.c
index 5cc8d0a4..128ed8e1 100644
--- a/types/wlr_output.c
+++ b/types/wlr_output.c
@@ -94,8 +94,6 @@ void wlr_output_transform(struct wlr_output *output,
 void wlr_output_destroy(struct wlr_output *output) {
 	if (!output) return;
 	output->impl->destroy(output->state);
-	free(output->make);
-	free(output->model);
 	for (size_t i = 0; output->modes && i < output->modes->length; ++i) {
 		free(output->modes->items[i]);
 	}