From 1bea754521e046287a5eff56fc56c1bd42b36c1f Mon Sep 17 00:00:00 2001
From: nyorain <nyorain@gmail.com>
Date: Wed, 9 Aug 2017 16:24:28 +0200
Subject: [PATCH] Implement wlr_region using pixman

---
 README.md                      |  2 +-
 include/wlr/types/wlr_region.h | 10 ++++++++
 meson.build                    |  2 ++
 types/meson.build              |  1 +
 types/wlr_region.c             | 44 ++++++++++++++++++++++++++++++++++
 5 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 include/wlr/types/wlr_region.h
 create mode 100644 types/wlr_region.c

diff --git a/README.md b/README.md
index 98c359fc..831b900f 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,6 @@ WIP - [Status](https://github.com/SirCmpwn/wlroots/issues/9)
 
 Install dependencies:
 
-* cmake
 * wayland
 * wayland-protocols
 * EGL
@@ -17,6 +16,7 @@ Install dependencies:
 * GBM
 * libinput
 * udev
+* pixman
 * systemd (optional, for logind support)
 * libcap (optional, for capability support)
 * asciidoc (optional, for man pages)
diff --git a/include/wlr/types/wlr_region.h b/include/wlr/types/wlr_region.h
new file mode 100644
index 00000000..9fff0150
--- /dev/null
+++ b/include/wlr/types/wlr_region.h
@@ -0,0 +1,10 @@
+#ifndef _WLR_TYPES_REGION_H
+#define _WLR_TYPES_REGION_H
+
+struct wl_resource;
+
+// Implements the given resource as region.
+// Sets the associated pixman_region32_t as userdata.
+void wlr_region_create(struct wl_resource *res);
+
+#endif
diff --git a/meson.build b/meson.build
index a6c8dd6c..b4a7fdc4 100644
--- a/meson.build
+++ b/meson.build
@@ -30,6 +30,7 @@ dep_gbm            = dependency('gbm')
 dep_libinput       = dependency('libinput')
 dep_xkbcommon      = dependency('xkbcommon')
 dep_udev           = dependency('libudev')
+dep_pixman           = dependency('pixman-1')
 dep_libcap         = dependency('libcap', required: false)
 dep_systemd        = dependency('libsystemd', required: false)
 dep_math           = cc.find_library('m', required: false)
@@ -46,6 +47,7 @@ all_deps = [
     dep_libinput,
     dep_xkbcommon,
     dep_udev,
+    dep_pixman,
     dep_libcap,
     dep_systemd,
     dep_math,
diff --git a/types/meson.build b/types/meson.build
index 323806c6..89e36ac0 100644
--- a/types/meson.build
+++ b/types/meson.build
@@ -3,6 +3,7 @@ wlr_files += files(
     'wlr_keyboard.c',
     'wlr_output.c',
     'wlr_pointer.c',
+    'wlr_region.c',
     'wlr_tablet_pad.c',
     'wlr_tablet_tool.c',
     'wlr_touch.c',
diff --git a/types/wlr_region.c b/types/wlr_region.c
new file mode 100644
index 00000000..a1c45542
--- /dev/null
+++ b/types/wlr_region.c
@@ -0,0 +1,44 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include <wayland-server.h>
+#include <pixman.h>
+
+static void region_add(struct wl_client *client, struct wl_resource *resource,
+		int32_t x, int32_t y, int32_t width, int32_t height) {
+	pixman_region32_t *region = wl_resource_get_user_data(resource);
+	pixman_region32_union_rect(region, region, x, y, width, height);
+}
+
+static void region_subtract(struct wl_client *client, struct wl_resource *resource,
+		int32_t x, int32_t y, int32_t width, int32_t height) {
+	pixman_region32_t *region = wl_resource_get_user_data(resource);
+	pixman_region32_union_rect(region, region, x, y, width, height);
+
+	pixman_region32_t rect;
+	pixman_region32_init_rect(&rect, x, y, width, height);
+	pixman_region32_subtract(region, region, &rect);
+	pixman_region32_fini(&rect);
+}
+
+static void region_destroy(struct wl_client *client, struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static const struct wl_region_interface region_interface = {
+	region_destroy,
+	region_add,
+	region_subtract,
+};
+
+static void destroy_region(struct wl_resource *resource) {
+	pixman_region32_t *reg = wl_resource_get_user_data(resource);
+	pixman_region32_fini(reg);
+	free(reg);
+}
+
+void wlr_region_create(struct wl_resource *res) {
+	pixman_region32_t *region = calloc(1, sizeof(pixman_region32_t));
+	pixman_region32_init(region);
+	wl_resource_set_implementation(res, &region_interface, region, destroy_region);
+}