Add a window client, first implementation of surface resizing.

Makefile

@@ -1,7 +1,7 @@
 CFLAGS +=  -Wall -g $(shell pkg-config --cflags libffi libdrm)
 LDLIBS += $(shell pkg-config --libs libffi libdrm)
 
-clients = flower pointer background
+clients = flower pointer background window
 
 all : wayland $(clients)
 
@@ -20,6 +20,7 @@ libwayland.so : $(libwayland_objs)
 flower_objs = flower.o
 pointer_objs = pointer.o
 background_objs = background.o
+window_objs = window.o
 
 $(clients) : CFLAGS += $(shell pkg-config --cflags cairo)
 $(clients) : LDLIBS += $(shell pkg-config --libs cairo gdk-pixbuf-2.0) -lrt

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;
+}