Switch to cairo-drm, drop struct buffer hacks.

Makefile.in

@@ -39,7 +39,7 @@ wayland-system-compositor :			\
 wayland-system-compositor : CFLAGS += @EGL_COMPOSITOR_CFLAGS@
 wayland-system-compositor : LDLIBS += -L. -lwayland-server @EGL_COMPOSITOR_LIBS@ -rdynamic -lrt
 
-flower : flower.o wayland-glib.o cairo-util.o
+flower : flower.o wayland-glib.o
 gears : gears.o window.o wayland-glib.o cairo-util.o
 screenshot : screenshot.o wayland-glib.o
 terminal : terminal.o window.o wayland-glib.o cairo-util.o

cairo-util.c

@@ -24,104 +24,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
-#include <i915_drm.h>
-#include <sys/ioctl.h>
 #include <math.h>
 #include <cairo.h>
 #include "cairo-util.h"
 
-struct buffer *
-buffer_create(int fd, int width, int height, int stride)
-{
-	struct buffer *buffer;
-	struct drm_i915_gem_create create;
-	struct drm_gem_flink flink;
-
-	buffer = malloc(sizeof *buffer);
-	buffer->width = width;
-	buffer->height = height;
-	buffer->stride = 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");
-		free(buffer);
-		return NULL;
-	}
-
-	flink.handle = create.handle;
-	if (ioctl(fd, DRM_IOCTL_GEM_FLINK, &flink) != 0) {
-		fprintf(stderr, "gem flink failed: %m\n");
-		free(buffer);
-		return 0;
-	}
-
-	buffer->handle = flink.handle;
-	buffer->name = flink.name;
-
-	return buffer;
-}
-
-int
-buffer_destroy(struct buffer *buffer, int fd)
-{
-	struct drm_gem_close close;
-
-	close.handle = buffer->handle;
-	if (ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close) < 0) {
-		fprintf(stderr, "gem close failed: %m\n");
-		return -1;
-	}
-	
-	free(buffer);
-
-	return 0;
-}
-
-int
-buffer_data(struct buffer *buffer, int fd, void *data)
-{
-	struct drm_i915_gem_pwrite pwrite;
-
-	pwrite.handle = buffer->handle;
-	pwrite.offset = 0;
-	pwrite.size = buffer->height * buffer->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 -1;
-	}
-
-	return 0;
-}
-
-struct buffer *
-buffer_create_from_cairo_surface(int fd, cairo_surface_t *surface)
-{
-	struct buffer *buffer;
-	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);
-
-	buffer = buffer_create(fd, width, height, stride);
-	if (buffer == NULL)
-		return NULL;
-
-	if (buffer_data(buffer, fd, data) < 0) {
-		buffer_destroy(buffer, fd);
-		return NULL;
-	}			
-
-	return buffer;
-}
-
 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
 
 void

flower.c

@@ -33,10 +33,10 @@
 #include <time.h>
 #include <cairo.h>
 #include <glib.h>
+#include <cairo-drm.h>
 
 #include "wayland-client.h"
 #include "wayland-glib.h"
-#include "cairo-util.h"
 
 static const char gem_device[] = "/dev/dri/card0";
 static const char socket_name[] = "\0wayland";
@@ -52,8 +52,8 @@ set_random_color(cairo_t *cr)
 }
 
 
-static void *
-draw_stuff(int width, int height)
+static void
+draw_stuff(cairo_surface_t *surface, int width, int height)
 {
 	const int petal_count = 3 + random() % 5;
 	const double r1 = 60 + random() % 35;
@@ -61,18 +61,14 @@ draw_stuff(int width, int height)
 	const double u = (10 + random() % 90) / 100.0;
 	const double v = (random() % 90) / 100.0;
 
-	cairo_surface_t *surface;
 	cairo_t *cr;
 	int i;
 	double t, dt = 2 * M_PI / (petal_count * 2);
 	double x1, y1, x2, y2, x3, y3;
 
-	surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
-					     width, height);
-
 	cr = cairo_create(surface);
 	cairo_translate(cr, width / 2, height / 2);
-	cairo_move_to(cr, cos(t) * r1, sin(t) * r1);
+	cairo_move_to(cr, cos(0) * r1, sin(0) * r1);
 	for (t = 0, i = 0; i < petal_count; i++, t += dt * 2) {
 		x1 = cos(t) * r1;
 		y1 = sin(t) * r1;
@@ -99,8 +95,6 @@ draw_stuff(int width, int height)
 	cairo_stroke(cr);
 
 	cairo_destroy(cr);
-
-	return surface;
 }
 
 struct flower {
@@ -141,12 +135,12 @@ int main(int argc, char *argv[])
 	struct wl_display *display;
 	struct wl_visual *visual;
 	int fd;
+	cairo_drm_context_t *ctx;
 	cairo_surface_t *s;
 	struct timespec ts;
 	GMainLoop *loop;
 	GSource *source;
 	struct flower flower;
-	struct buffer *buffer;
 
 	fd = open(gem_device, O_RDWR);
 	if (fd < 0) {
@@ -176,13 +170,17 @@ int main(int argc, char *argv[])
 	srandom(ts.tv_nsec);
 	flower.offset = random();
 
-	s = draw_stuff(flower.width, flower.height);
-	buffer = buffer_create_from_cairo_surface(fd, s);
+	ctx = cairo_drm_context_get_for_fd(fd);
+	s = cairo_drm_surface_create(ctx, CAIRO_CONTENT_COLOR_ALPHA,
+				     flower.width, flower.height);
+	draw_stuff(s, flower.width, flower.height);
 
 	visual = wl_display_get_premultiplied_argb_visual(display);
 	wl_surface_attach(flower.surface,
-			  buffer->name, flower.width, flower.height,
-			  buffer->stride, visual);
+			  cairo_drm_surface_get_name(s),
+			  flower.width, flower.height,
+			  cairo_drm_surface_get_stride(s),
+			  visual);
 
 	wl_compositor_add_listener(flower.compositor,
 				   &compositor_listener, &flower);

gears.c

@@ -30,6 +30,7 @@
 #include <time.h>
 #include <cairo.h>
 #include <glib.h>
+#include <cairo-drm.h>
 
 #include <GL/gl.h>
 #include <eagle.h>
@@ -37,7 +38,6 @@
 #include "wayland-client.h"
 #include "wayland-glib.h"
 
-#include "cairo-util.h"
 #include "window.h"
 
 static const char gem_device[] = "/dev/dri/card0";
@@ -55,9 +55,8 @@ struct gears {
 	EGLSurface surface;
 	EGLContext context;
 	int resized;
-	int fd;
 	GLfloat angle;
-	struct buffer *buffer;
+	cairo_surface_t *cairo_surface;
 
 	GLint gear_list[3];
 };
@@ -244,6 +243,8 @@ draw_gears(struct gears *gears)
 static void
 resize_window(struct gears *gears)
 {
+	uint32_t name, stride;
+
 	/* Constrain child size to be square and at least 300x300 */
 	window_get_child_rectangle(gears->window, &gears->rectangle);
 	if (gears->rectangle.width > gears->rectangle.height)
@@ -258,20 +259,20 @@ resize_window(struct gears *gears)
 
 	window_draw(gears->window);
 
-	if (gears->buffer != NULL)
-		buffer_destroy(gears->buffer, gears->fd);
+	if (gears->cairo_surface != NULL)
+		cairo_surface_destroy(gears->cairo_surface);
 
-	gears->buffer = buffer_create(gears->fd,
-				      gears->rectangle.width,
-				      gears->rectangle.height,
-				      (gears->rectangle.width * 4 + 15) & ~15);
+	gears->cairo_surface = window_create_surface(gears->window,
+						     &gears->rectangle);
 
+	name = cairo_drm_surface_get_name(gears->cairo_surface);
+	stride = cairo_drm_surface_get_stride(gears->cairo_surface),
 	gears->surface = eglCreateSurfaceForName(gears->display,
 						 gears->config,
-						 gears->buffer->name,
-						 gears->buffer->width,
-						 gears->buffer->height,
-						 gears->buffer->stride, NULL);
+						 name,
+						 gears->rectangle.width,
+						 gears->rectangle.height,
+						 stride, NULL);
 
 	eglMakeCurrent(gears->display,
 		       gears->surface, gears->surface, gears->context);
@@ -321,9 +322,9 @@ handle_frame(void *data,
 {
 	struct gears *gears = data;
 
-	window_copy(gears->window,
+	window_copy_surface(gears->window,
 			    &gears->rectangle,
-		    gears->buffer->name, gears->buffer->stride);
+			    gears->cairo_surface);
 
 	wl_compositor_commit(gears->compositor, 0);
 
@@ -352,7 +353,6 @@ gears_create(struct wl_display *display, int fd)
 	gears = malloc(sizeof *gears);
 	memset(gears, 0, sizeof *gears);
 	gears->wl_display = display;
-	gears->fd = fd;
 	gears->window = window_create(display, fd, "Wayland Gears",
 				      x, y, width, height);
 

terminal.c

@@ -33,6 +33,7 @@
 #include <cairo.h>
 #include <glib.h>
 #include <linux/input.h>
+#include <cairo-drm.h>
 
 #include <GL/gl.h>
 #include <eagle.h>
@@ -40,7 +41,6 @@
 #include "wayland-client.h"
 #include "wayland-glib.h"
 
-#include "cairo-util.h"
 #include "window.h"
 
 static int option_fullscreen;
@@ -59,7 +59,7 @@ struct terminal {
 	char *data;
 	int width, height, start, row, column;
 	int fd, master;
-	struct buffer *buffer;
+	cairo_surface_t *surface;
 	GIOChannel *channel;
 	uint32_t modifiers;
 	char escape[64];
@@ -128,16 +128,15 @@ static void
 terminal_draw_contents(struct terminal *terminal)
 {
 	struct rectangle rectangle;
-	cairo_surface_t *surface;
 	cairo_t *cr;
 	cairo_font_extents_t extents;
 	int i, top_margin, side_margin;
 
 	window_get_child_rectangle(terminal->window, &rectangle);
 
-	surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
-					     rectangle.width, rectangle.height);
-	cr = cairo_create(surface);
+	terminal->surface =
+		window_create_surface(terminal->window, &rectangle);
+	cr = cairo_create(terminal->surface);
 	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 	cairo_set_source_rgba(cr, 0, 0, 0, 0.9);
 	cairo_paint(cr);
@@ -160,12 +159,9 @@ terminal_draw_contents(struct terminal *terminal)
 	}
 	cairo_destroy(cr);
 
-	terminal->buffer = buffer_create_from_cairo_surface(terminal->fd, surface);
-	cairo_surface_destroy(surface);
-
-	window_copy(terminal->window,
+	window_copy_surface(terminal->window,
 			    &rectangle,
-		    terminal->buffer->name, terminal->buffer->stride);
+			    terminal->surface);
 }
 
 static void
@@ -405,7 +401,7 @@ handle_acknowledge(void *data,
 
 	terminal->redraw_scheduled = 0;
 	if (key == 0)
-		buffer_destroy(terminal->buffer, terminal->fd);
+		cairo_surface_destroy(terminal->surface);
 
 	if (terminal->redraw_pending) {
 		terminal->redraw_pending = 0;
@@ -553,7 +549,6 @@ terminal_create(struct wl_display *display, int fd, int fullscreen)
 		return terminal;
 
 	memset(terminal, 0, sizeof *terminal);
-	terminal->fd = fd;
 	terminal->fullscreen = fullscreen;
 	terminal->window = window_create(display, fd, "Wayland Terminal",
 					 500, 100, 500, 400);

window.c

@@ -30,13 +30,12 @@
 #include <time.h>
 #include <cairo.h>
 #include <glib.h>
+#include <cairo-drm.h>
 
 #include <linux/input.h>
 #include "wayland-client.h"
 #include "wayland-glib.h"
 
-#include "cairo-util.h"
-
 #include "window.h"
 
 struct window {
@@ -52,9 +51,9 @@ struct window {
 	int fullscreen;
 	struct wl_input_device *grab_device;
 	uint32_t name;
-	int fd;
+	cairo_drm_context_t *ctx;
 
-	struct buffer *buffer;
+	cairo_surface_t *cairo_surface;
 
 	window_resize_handler_t resize_handler;
 	window_key_handler_t key_handler;
@@ -78,7 +77,6 @@ rounded_rect(cairo_t *cr, int x0, int y0, int x1, int y1, int radius)
 static void
 window_draw_decorations(struct window *window)
 {
-	cairo_surface_t *surface;
 	cairo_t *cr;
 	int border = 2, radius = 5;
 	cairo_text_extents_t extents;
@@ -86,7 +84,9 @@ window_draw_decorations(struct window *window)
 	struct wl_visual *visual;
 	int width, height;
 
-	surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
+	window->cairo_surface =
+		cairo_drm_surface_create(window->ctx,
+					 CAIRO_CONTENT_COLOR_ALPHA,
 					 window->allocation.width,
 					 window->allocation.height);
 
@@ -94,7 +94,7 @@ window_draw_decorations(struct window *window)
 	bright = cairo_pattern_create_rgb(0.8, 0.8, 0.8);
 	dim = cairo_pattern_create_rgb(0.4, 0.4, 0.4);
 
-	cr = cairo_create(surface);
+	cr = cairo_create(window->cairo_surface);
 
 	width = window->allocation.width - window->margin * 2;
 	height = window->allocation.height - window->margin * 2;
@@ -104,7 +104,20 @@ window_draw_decorations(struct window *window)
 	cairo_set_source_rgba(cr, 0, 0, 0, 0.7);
 	rounded_rect(cr, 0, 0, width, height, radius);
 	cairo_fill(cr);
-	blur_surface(surface, 24 + radius);
+
+#ifdef SLOW_BUT_PWETTY
+	/* FIXME: Aw, pretty drop shadows now have to fallback to sw.
+	 * Ideally we should have convolution filters in cairo, but we
+	 * can also fallback to compositing the shadow image a bunch
+	 * of times according to the blur kernel. */
+	{
+		cairo_surface_t *map;
+
+		map = cairo_drm_surface_map(window->cairo_surface);
+		blur_surface(map);
+		cairo_drm_surface_unmap(window->cairo_surface, map);
+	}
+#endif
 
 	cairo_translate(cr, -7, -5);
 	cairo_set_line_width (cr, border);
@@ -157,15 +170,12 @@ window_draw_decorations(struct window *window)
 	cairo_fill(cr);
 	cairo_destroy(cr);
 
-	window->buffer = buffer_create_from_cairo_surface(window->fd, surface);
-	cairo_surface_destroy(surface);
-
 	visual = wl_display_get_premultiplied_argb_visual(window->display);
 	wl_surface_attach(window->surface,
-			  window->buffer->name,
-			  window->buffer->width,
-			  window->buffer->height,
-			  window->buffer->stride,
+			  cairo_drm_surface_get_name(window->cairo_surface),
+			  window->allocation.width,
+			  window->allocation.height,
+			  cairo_drm_surface_get_stride(window->cairo_surface),
 			  visual);
 
 	wl_surface_map(window->surface,
@@ -179,19 +189,19 @@ static void
 window_draw_fullscreen(struct window *window)
 {
 	struct wl_visual *visual;
-	int stride = window->allocation.width * 4;
 
-	window->buffer = buffer_create(window->fd,
+	window->cairo_surface =
+		cairo_drm_surface_create(window->ctx,
+					 CAIRO_CONTENT_COLOR_ALPHA,
 					 window->allocation.width,
-				       window->allocation.height,
-				       stride);
+					 window->allocation.height);
 
 	visual = wl_display_get_premultiplied_argb_visual(window->display);
 	wl_surface_attach(window->surface,
-			  window->buffer->name,
-			  window->buffer->width,
-			  window->buffer->height,
-			  window->buffer->stride,
+			  cairo_drm_surface_get_name(window->cairo_surface),
+			  window->allocation.width,
+			  window->allocation.height,
+			  cairo_drm_surface_get_stride(window->cairo_surface),
 			  visual);
 
 	wl_surface_map(window->surface,
@@ -222,9 +232,9 @@ window_handle_acknowledge(void *data,
 	 * safely free the old window buffer if we resized and
 	 * render the next frame into our back buffer.. */
 
-	if (key == 0 && window->buffer != NULL) {
-		buffer_destroy(window->buffer, window->fd);
-		window->buffer = NULL;
+	if (key == 0 && window->cairo_surface != NULL) {
+		cairo_surface_destroy(window->cairo_surface);
+		window->cairo_surface = NULL;
 	}
 }
 
@@ -382,6 +392,16 @@ window_set_child_size(struct window *window,
 	}
 }
 
+cairo_surface_t *
+window_create_surface(struct window *window,
+		      struct rectangle *rectangle)
+{
+	return cairo_drm_surface_create(window->ctx,
+					CAIRO_CONTENT_COLOR_ALPHA,
+					rectangle->width,
+					rectangle->height);
+}
+
 void
 window_copy(struct window *window,
 	    struct rectangle *rectangle,
@@ -396,6 +416,21 @@ window_copy(struct window *window,
 			rectangle->height);
 }
 
+void
+window_copy_surface(struct window *window,
+		    struct rectangle *rectangle,
+		    cairo_surface_t *surface)
+{
+	wl_surface_copy(window->surface,
+			rectangle->x,
+			rectangle->y,
+			cairo_drm_surface_get_name(surface),
+			cairo_drm_surface_get_stride(surface),
+			0, 0,
+			rectangle->width,
+			rectangle->height);
+}
+
 void
 window_set_fullscreen(struct window *window, int fullscreen)
 {
@@ -488,7 +523,11 @@ window_create(struct wl_display *display, int fd,
 	window->saved_allocation = window->allocation;
 	window->margin = 16;
 	window->state = WINDOW_STABLE;
-	window->fd = fd;
+	window->ctx = cairo_drm_context_get_for_fd(fd);
+	if (window->ctx == NULL) {
+		fprintf(stderr, "failed to get cairo drm context\n");
+		return NULL;
+	}
 
 	wl_display_add_global_listener(display,
 				       window_handle_global, window);

window.h

@@ -56,6 +56,15 @@ window_copy(struct window *window,
 	    struct rectangle *rectangle,
 	    uint32_t name, uint32_t stride);
 
+cairo_surface_t *
+window_create_surface(struct window *window,
+		      struct rectangle *rectangle);
+
+void
+window_copy_surface(struct window *window,
+		    struct rectangle *rectangle,
+		    cairo_surface_t *surface);
+
 void
 window_set_fullscreen(struct window *window, int fullscreen);