window: Allow hinting of a preference for RGB565 when creating a window
And check if the renderer supports the RGB565 format for wl_shm buffers
before creating the cairo surface and requesting the buffer.
It can save quite some memory with big surfaces such as desktop
backgrounds.
diff --git a/clients/window.c b/clients/window.c
index d9f7d5a..b9045f3 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -128,6 +128,8 @@
/* A hack to get text extents for tooltips */
cairo_surface_t *dummy_surface;
void *dummy_surface_data;
+
+ int has_rgb565;
};
enum {
@@ -237,6 +239,8 @@
int fullscreen_method;
int configure_requests;
+ enum preferred_format preferred_format;
+
window_key_handler_t key_handler;
window_keyboard_focus_handler_t keyboard_focus_handler;
window_data_handler_t data_handler;
@@ -794,6 +798,7 @@
struct shm_surface_data *data;
uint32_t format;
cairo_surface_t *surface;
+ cairo_format_t cairo_format;
int stride, length, offset;
void *map;
@@ -801,8 +806,12 @@
if (data == NULL)
return NULL;
- stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32,
- rectangle->width);
+ if (flags & SURFACE_HINT_RGB565 && display->has_rgb565)
+ cairo_format = CAIRO_FORMAT_RGB16_565;
+ else
+ cairo_format = CAIRO_FORMAT_ARGB32;
+
+ stride = cairo_format_stride_for_width (cairo_format, rectangle->width);
length = stride * rectangle->height;
data->pool = NULL;
map = shm_pool_allocate(pool, length, &offset);
@@ -813,7 +822,7 @@
}
surface = cairo_image_surface_create_for_data (map,
- CAIRO_FORMAT_ARGB32,
+ cairo_format,
rectangle->width,
rectangle->height,
stride);
@@ -821,10 +830,14 @@
cairo_surface_set_user_data(surface, &shm_surface_data_key,
data, shm_surface_data_destroy);
- if (flags & SURFACE_OPAQUE)
- format = WL_SHM_FORMAT_XRGB8888;
- else
- format = WL_SHM_FORMAT_ARGB8888;
+ if (flags & SURFACE_HINT_RGB565 && display->has_rgb565)
+ format = WL_SHM_FORMAT_RGB565;
+ else {
+ if (flags & SURFACE_OPAQUE)
+ format = WL_SHM_FORMAT_XRGB8888;
+ else
+ format = WL_SHM_FORMAT_ARGB8888;
+ }
data->buffer = wl_shm_pool_create_buffer(pool->pool, offset,
rectangle->width,
@@ -1425,6 +1438,9 @@
if (window->resizing)
flags |= SURFACE_HINT_RESIZE;
+ if (window->preferred_format == WINDOW_PREFERRED_FORMAT_RGB565)
+ flags |= SURFACE_HINT_RGB565;
+
if (window->resize_edges & WINDOW_RESIZING_LEFT)
dx = surface->server_allocation.width -
surface->allocation.width;
@@ -4209,6 +4225,7 @@
window->type = type;
window->fullscreen_method = WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT;
window->configure_requests = 0;
+ window->preferred_format = WINDOW_PREFERRED_FORMAT_NONE;
if (display->argb_device)
#ifdef HAVE_CAIRO_EGL
@@ -4432,6 +4449,13 @@
window->main_surface->buffer_type = type;
}
+void
+window_set_preferred_format(struct window *window,
+ enum preferred_format format)
+{
+ window->preferred_format = format;
+}
+
struct widget *
window_add_subsurface(struct window *window, void *data,
enum subsurface_mode default_mode)
@@ -4730,6 +4754,19 @@
}
static void
+shm_format(void *data, struct wl_shm *wl_shm, uint32_t format)
+{
+ struct display *d = data;
+
+ if (format == WL_SHM_FORMAT_RGB565)
+ d->has_rgb565 = 1;
+}
+
+struct wl_shm_listener shm_listener = {
+ shm_format
+};
+
+static void
registry_handle_global(void *data, struct wl_registry *registry, uint32_t id,
const char *interface, uint32_t version)
{
@@ -4754,6 +4791,7 @@
id, &wl_shell_interface, 1);
} else if (strcmp(interface, "wl_shm") == 0) {
d->shm = wl_registry_bind(registry, id, &wl_shm_interface, 1);
+ wl_shm_add_listener(d->shm, &shm_listener, d);
} else if (strcmp(interface, "wl_data_device_manager") == 0) {
d->data_device_manager =
wl_registry_bind(registry, id,