Add a window client, first implementation of surface resizing.
diff --git a/window.c b/window.c
new file mode 100644
index 0000000..ee9de1e
--- /dev/null
+++ b/window.c
@@ -0,0 +1,290 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <i915_drm.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <math.h>
+#include <time.h>
+#include <cairo.h>
+
+#include "wayland-client.h"
+
+static const char gem_device[] = "/dev/dri/card0";
+static const char socket_name[] = "\0wayland";
+
+static void
+unpremultiply_data(uint8_t *data, int width, int height, int stride)
+{
+ unsigned int i, j;
+ uint8_t *row;
+
+ for (j = 0; j < height; j++) {
+ row = data + j * stride;
+
+ for (i = 0; i < width; i++) {
+ uint8_t *b = &row[i * 4];
+ uint32_t pixel;
+ uint8_t alpha;
+
+ memcpy (&pixel, b, sizeof (uint32_t));
+ alpha = (pixel & 0xff000000) >> 24;
+ if (alpha == 0) {
+ b[0] = b[1] = b[2] = b[3] = 0;
+ } else {
+ b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
+ b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
+ b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
+ b[3] = alpha;
+ }
+ }
+ }
+}
+
+static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
+{
+ struct drm_i915_gem_create create;
+ struct drm_gem_flink flink;
+ struct drm_i915_gem_pwrite pwrite;
+ int32_t width, height, stride;
+ void *data;
+
+ width = cairo_image_surface_get_width(surface);
+ height = cairo_image_surface_get_height(surface);
+ stride = cairo_image_surface_get_stride(surface);
+ data = cairo_image_surface_get_data(surface);
+
+ unpremultiply_data(data, width, height, stride);
+
+ memset(&create, 0, sizeof(create));
+ create.size = height * stride;
+
+ if (ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create) != 0) {
+ fprintf(stderr, "gem create failed: %m\n");
+ return 0;
+ }
+
+ pwrite.handle = create.handle;
+ pwrite.offset = 0;
+ pwrite.size = height * stride;
+ pwrite.data_ptr = (uint64_t) (uintptr_t) data;
+ if (ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite) < 0) {
+ fprintf(stderr, "gem pwrite failed: %m\n");
+ return 0;
+ }
+
+ flink.handle = create.handle;
+ if (ioctl(fd, DRM_IOCTL_GEM_FLINK, &flink) != 0) {
+ fprintf(stderr, "gem flink failed: %m\n");
+ return 0;
+ }
+
+#if 0
+ /* We need to hold on to the handle until the server has received
+ * the attach request... we probably need a confirmation event.
+ * I guess the breadcrumb idea will suffice. */
+ struct drm_gem_close close;
+ close.handle = create.handle;
+ if (ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close) < 0) {
+ fprintf(stderr, "gem close failed: %m\n");
+ return 0;
+ }
+#endif
+
+ return flink.name;
+}
+
+struct window {
+ struct wl_surface *surface;
+ int x, y, width, height, stride;
+ int drag_x, drag_y, last_x, last_y;
+ int state;
+ uint32_t name;
+ int fd;
+};
+
+static void *
+draw_window(struct window *window)
+{
+ cairo_surface_t *surface;
+ cairo_t *cr;
+ int border = 4;
+ int half = (border + 1) / 2;
+
+ surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
+ window->width,
+ window->height);
+
+ cr = cairo_create(surface);
+ cairo_set_line_width (cr, border);
+ cairo_move_to(cr, half, half);
+ cairo_line_to(cr, window->width - half, half);
+ cairo_line_to(cr, window->width - half,
+ window->height - half);
+ cairo_line_to(cr, half, window->height - half);
+ cairo_close_path(cr);
+ cairo_set_source_rgba(cr, 0, 0, 0, 0.85);
+ cairo_fill_preserve(cr);
+ cairo_set_source_rgba(cr, 0, 0, 0, 1);
+ cairo_stroke(cr);
+ cairo_destroy(cr);
+
+ window->stride = cairo_image_surface_get_stride(surface);
+
+ window->name = name_cairo_surface(window->fd, surface);
+ cairo_surface_destroy(surface);
+
+ wl_surface_attach(window->surface, window->name,
+ window->width, window->height, window->stride);
+
+ wl_surface_map(window->surface,
+ window->x, window->y,
+ window->width, window->height);
+
+ return surface;
+}
+
+static int
+connection_update(struct wl_connection *connection,
+ uint32_t mask, void *data)
+{
+ struct pollfd *p = data;
+
+ p->events = 0;
+ if (mask & WL_CONNECTION_READABLE)
+ p->events |= POLLIN;
+ if (mask & WL_CONNECTION_WRITABLE)
+ p->events |= POLLOUT;
+
+ return 0;
+}
+
+enum window_state {
+ WINDOW_STABLE,
+ WINDOW_MOVING,
+ WINDOW_RESIZING_UPPER_LEFT,
+ WINDOW_RESIZING_UPPER_RIGHT,
+ WINDOW_RESIZING_LOWER_LEFT,
+ WINDOW_RESIZING_LOWER_RIGHT
+};
+
+enum location {
+ LOCATION_INTERIOR,
+ LOCATION_UPPER_LEFT,
+ LOCATION_UPPER_RIGHT,
+ LOCATION_LOWER_LEFT,
+ LOCATION_LOWER_RIGHT,
+ LOCATION_OUTSIDE
+};
+
+void event_handler(struct wl_display *display,
+ uint32_t opcode,
+ uint32_t arg1, uint32_t arg2, void *data)
+{
+ struct window *window = data;
+ int location, border = 4;
+ int grip_size = 16;
+
+ if (opcode == 0) {
+ window->last_x = arg1;
+ window->last_y = arg2;
+ switch (window->state) {
+ case WINDOW_MOVING:
+ window->x = window->drag_x + arg1;
+ window->y = window->drag_y + arg2;
+ wl_surface_map(window->surface, window->x, window->y,
+ window->width, window->height);
+ break;
+ case WINDOW_RESIZING_LOWER_RIGHT:
+ window->width = window->drag_x + arg1;
+ window->height = window->drag_y + arg2;
+ draw_window(window);
+ break;
+ }
+ }
+
+ if (window->x + border <= window->last_x &&
+ window->last_x < window->x + window->width - border &&
+ window->y + border <= window->last_y &&
+ window->last_y < window->y + window->height - border) {
+ location = LOCATION_INTERIOR;
+ } else if (window->x + window->width - grip_size <= window->last_x &&
+ window->last_x < window->x + window->width &&
+ window->y + window->height - grip_size <= window->last_y &&
+ window->last_y < window->y + window->height) {
+ location = LOCATION_LOWER_RIGHT;
+ } else {
+ location = LOCATION_OUTSIDE;
+ }
+
+ if (opcode == 1 && arg1 == 0 && arg2 == 1) {
+ switch (location) {
+ case LOCATION_INTERIOR:
+ window->drag_x = window->x - window->last_x;
+ window->drag_y = window->y - window->last_y;
+ window->state = WINDOW_MOVING;
+ break;
+ case LOCATION_LOWER_RIGHT:
+ window->drag_x = window->width - window->last_x;
+ window->drag_y = window->height - window->last_y;
+ window->state = WINDOW_RESIZING_LOWER_RIGHT;
+ break;
+ default:
+ window->state = WINDOW_STABLE;
+ break;
+ }
+ } else if (opcode == 1 && arg1 == 0 && arg2 == 0) {
+ window->state = WINDOW_STABLE;
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ struct wl_display *display;
+ int fd, ret;
+ uint32_t mask;
+ cairo_surface_t *s;
+ struct pollfd p[1];
+ struct window window;
+
+ fd = open(gem_device, O_RDWR);
+ if (fd < 0) {
+ fprintf(stderr, "drm open failed: %m\n");
+ return -1;
+ }
+
+ display = wl_display_create(socket_name,
+ connection_update, &p[0]);
+ if (display == NULL) {
+ fprintf(stderr, "failed to create display: %m\n");
+ return -1;
+ }
+ p[0].fd = wl_display_get_fd(display);
+
+ window.surface = wl_display_create_surface(display);
+ window.x = 200;
+ window.y = 200;
+ window.width = 350;
+ window.height = 200;
+ window.state = WINDOW_STABLE;
+ window.fd = fd;
+
+ s = draw_window(&window);
+
+ wl_display_set_event_handler(display, event_handler, &window);
+
+ while (ret = poll(p, 1, -1), ret >= 0) {
+ mask = 0;
+ if (p[0].revents & POLLIN)
+ mask |= WL_CONNECTION_READABLE;
+ if (p[0].revents & POLLOUT)
+ mask |= WL_CONNECTION_WRITABLE;
+ if (mask)
+ wl_display_iterate(display, mask);
+ }
+
+ return 0;
+}