version bump

We have those fields on the drwbuf struct, but we always use the
same ones. Let's deduplicate those fields by moving them on the drwsurf.

Signed-off-by: Maarten van Gompel <proycon@anaproy.nl>

config.mk

@@ -1,4 +1,4 @@
-VERSION = 0.16.1
+VERSION = 0.17
 CFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=700
 PREFIX = /usr/local
 MANPREFIX = ${PREFIX}/share/man

drw.c

@@ -6,34 +6,131 @@
 #include "shm_open.h"
 #include "math.h"
 
+void drwbuf_handle_release(void *data, struct wl_buffer *wl_buffer) {
+    struct drwsurf *ds = data;
+    ds->released = true;
+};
+
+const struct wl_buffer_listener buffer_listener = {
+    .release = drwbuf_handle_release
+};
+
+void drwsurf_handle_frame_cb(void* data, struct wl_callback* callback,
+    uint32_t time)
+{
+    struct drwsurf *ds = data;
+    wl_callback_destroy(ds->frame_cb);
+    ds->frame_cb = NULL;
+
+    cairo_rectangle_int_t r = {0};
+    for (int i = 0; i < cairo_region_num_rectangles(ds->damage); i++) {
+        cairo_region_get_rectangle(ds->damage, i, &r);
+        wl_surface_damage(ds->surf, r.x, r.y, r.width, r.height);
+    };
+    cairo_region_subtract(ds->damage, ds->damage);
+
+    drwsurf_attach(ds);
+}
+
+const struct wl_callback_listener frame_listener = {
+    .done = drwsurf_handle_frame_cb
+};
+
+void drwsurf_register_frame_cb(struct drwsurf *ds)
+{
+    if (ds->frame_cb)
+        return;
+    if (!ds->attached)
+        return;
+    ds->frame_cb = wl_surface_frame(ds->surf);
+    wl_callback_add_listener(ds->frame_cb, &frame_listener, ds);
+    wl_surface_commit(ds->surf);
+}
+
+void drwsurf_damage(struct drwsurf *ds, uint32_t x, uint32_t y, uint32_t w, uint32_t h)
+{
+    cairo_rectangle_int_t rect = { x, y, w, h };
+    cairo_region_union_rectangle(ds->damage, &rect);
+    cairo_region_union_rectangle(ds->backport_damage, &rect);
+    drwsurf_register_frame_cb(ds);
+}
+
 void
 drwsurf_resize(struct drwsurf *ds, uint32_t w, uint32_t h, double s)
 {
-    if (ds->buf) {
-        munmap(ds->pool_data, ds->size);
-        wl_buffer_destroy(ds->buf);
-        ds->buf = NULL;
-    }
-
     ds->scale = s;
     ds->width = ceil(w * s);
     ds->height = ceil(h * s);
 
-    setup_buffer(ds);
+    if (ds->damage)
+        cairo_region_destroy(ds->damage);
+    ds->damage = cairo_region_create();
+    if (ds->backport_damage)
+        cairo_region_destroy(ds->backport_damage);
+    ds->backport_damage = cairo_region_create();
+
+    ds->released = true;
+
+    setup_buffer(ds, ds->back_buffer);
+    setup_buffer(ds, ds->display_buffer);
+}
+
+void
+drwsurf_backport(struct drwsurf *ds)
+{
+    cairo_save(ds->back_buffer->cairo);
+
+    cairo_scale(ds->back_buffer->cairo, 1/ds->scale, 1/ds->scale);
+    cairo_set_operator(ds->back_buffer->cairo, CAIRO_OPERATOR_SOURCE);
+
+    cairo_rectangle_int_t r = {0};
+    for (int i = 0; i < cairo_region_num_rectangles(ds->backport_damage); i++) {
+        cairo_region_get_rectangle(ds->backport_damage, i, &r);
+
+        cairo_set_source_surface(ds->back_buffer->cairo, ds->display_buffer->cairo_surf, 0, 0);
+        cairo_rectangle(
+            ds->back_buffer->cairo,
+            r.x * ds->scale,
+            r.y * ds->scale,
+            r.width * ds->scale,
+            r.height * ds->scale
+        );
+        cairo_fill(ds->back_buffer->cairo);
+    };
+
+    cairo_restore(ds->back_buffer->cairo);
+    cairo_region_subtract(ds->backport_damage, ds->backport_damage);
+}
+
+void
+drwsurf_attach(struct drwsurf *ds)
+{
+    wl_surface_attach(ds->surf, ds->back_buffer->buf, 0, 0);
+    wl_surface_commit(ds->surf);
+    ds->released = false;
+    ds->attached = true;
 }
 
 void
 drwsurf_flip(struct drwsurf *ds)
 {
-    wl_surface_attach(ds->surf, ds->buf, 0, 0);
-    wl_surface_commit(ds->surf);
+    if (ds->released)
+        return;
+    ds->released = true;
+    struct drwbuf *tmp = ds->back_buffer;
+    ds->back_buffer = ds->display_buffer;
+    ds->display_buffer = tmp;
+
+    drwsurf_backport(ds);
 }
 
 void
-drw_draw_text(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
+drw_draw_text(struct drwsurf *ds, Color color, uint32_t x, uint32_t y,
               uint32_t w, uint32_t h, uint32_t b, const char *label,
               PangoFontDescription *font_description)
 {
+    drwsurf_flip(ds);
+    struct drwbuf *d = ds->back_buffer;
 
     cairo_save(d->cairo);
 
@@ -58,8 +155,11 @@ drw_draw_text(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
 }
 
 void
-drw_do_clear(struct drwsurf *d, uint32_t x, uint32_t y, uint32_t w, uint32_t h)
+drw_do_clear(struct drwsurf *ds, uint32_t x, uint32_t y, uint32_t w, uint32_t h)
 {
+    drwsurf_flip(ds);
+    struct drwbuf *d = ds->back_buffer;
+
     cairo_save(d->cairo);
 
     cairo_set_operator(d->cairo, CAIRO_OPERATOR_CLEAR);
@@ -70,9 +170,12 @@ drw_do_clear(struct drwsurf *d, uint32_t x, uint32_t y, uint32_t w, uint32_t h)
 }
 
 void
-drw_do_rectangle(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
+drw_do_rectangle(struct drwsurf *ds, Color color, uint32_t x, uint32_t y,
                  uint32_t w, uint32_t h, bool over, int rounding)
 {
+    drwsurf_flip(ds);
+    struct drwbuf *d = ds->back_buffer;
+
     cairo_save(d->cairo);
 
     if (over) {
@@ -128,41 +231,52 @@ drw_over_rectangle(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
 }
 
 uint32_t
-setup_buffer(struct drwsurf *drwsurf)
+setup_buffer(struct drwsurf *drwsurf, struct drwbuf *drwbuf)
 {
+    int prev_size = drwbuf->size;
     int stride = drwsurf->width * 4;
-    drwsurf->size = stride * drwsurf->height;
+    drwbuf->size = stride * drwsurf->height;
 
-    int fd = allocate_shm_file(drwsurf->size);
+    int fd = allocate_shm_file(drwbuf->size);
     if (fd == -1) {
         return 1;
     }
 
-    drwsurf->pool_data =
-        mmap(NULL, drwsurf->size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
-    if (drwsurf->pool_data == MAP_FAILED) {
+    if (drwbuf->pool_data)
+        munmap(drwbuf->pool_data, prev_size);
+    drwbuf->pool_data =
+        mmap(NULL, drwbuf->size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+    if (drwbuf->pool_data == MAP_FAILED) {
         close(fd);
         return 1;
     }
 
+    if (drwbuf->buf)
+        wl_buffer_destroy(drwbuf->buf);
     struct wl_shm_pool *pool =
-        wl_shm_create_pool(drwsurf->ctx->shm, fd, drwsurf->size);
-    drwsurf->buf =
+        wl_shm_create_pool(drwsurf->ctx->shm, fd, drwbuf->size);
+    drwbuf->buf =
         wl_shm_pool_create_buffer(pool, 0, drwsurf->width, drwsurf->height,
                                   stride, WL_SHM_FORMAT_ARGB8888);
     wl_shm_pool_destroy(pool);
     close(fd);
+    wl_buffer_add_listener(drwbuf->buf, &buffer_listener, drwsurf);
 
-    cairo_surface_t *s = cairo_image_surface_create_for_data(
-        drwsurf->pool_data, CAIRO_FORMAT_ARGB32, drwsurf->width,
+
+    if (drwbuf->cairo_surf)
+        cairo_surface_destroy(drwbuf->cairo_surf);
+    drwbuf->cairo_surf = cairo_image_surface_create_for_data(
+        drwbuf->pool_data, CAIRO_FORMAT_ARGB32, drwsurf->width,
         drwsurf->height, stride);
 
-    drwsurf->cairo = cairo_create(s);
-    cairo_scale(drwsurf->cairo, drwsurf->scale, drwsurf->scale);
-    cairo_set_antialias(drwsurf->cairo, CAIRO_ANTIALIAS_NONE);
-    drwsurf->layout = pango_cairo_create_layout(drwsurf->cairo);
-    pango_layout_set_auto_dir(drwsurf->layout, false);
-    cairo_save(drwsurf->cairo);
+    if (drwbuf->cairo)
+        cairo_destroy(drwbuf->cairo);
+    drwbuf->cairo = cairo_create(drwbuf->cairo_surf);
+    cairo_scale(drwbuf->cairo, drwsurf->scale, drwsurf->scale);
+    cairo_set_antialias(drwbuf->cairo, CAIRO_ANTIALIAS_NONE);
+    drwbuf->layout = pango_cairo_create_layout(drwbuf->cairo);
+    pango_layout_set_auto_dir(drwbuf->layout, false);
+    cairo_save(drwbuf->cairo);
 
     return 0;
 }

drw.h

@@ -7,22 +7,35 @@
 struct drw {
 	struct wl_shm *shm;
 };
+struct drwbuf {
+	uint32_t size;
+	struct wl_buffer *buf;
+	cairo_surface_t *cairo_surf;
+	cairo_t *cairo;
+	PangoLayout *layout;
+	unsigned char *pool_data;
+};
 struct drwsurf {
-	uint32_t width, height, size;
+	uint32_t width, height;
 	double scale;
 
 	struct drw *ctx;
 	struct wl_surface *surf;
-	struct wl_buffer *buf;
 	struct wl_shm *shm;
-	unsigned char *pool_data;
+	struct wl_callback *frame_cb;
 
-	cairo_t *cairo;
-	PangoLayout *layout;
+	cairo_region_t *damage, *backport_damage;
+	bool attached;
+	bool released;
+
+	struct drwbuf *back_buffer;
+	struct drwbuf *display_buffer;
 };
 struct kbd;
 
+void drwsurf_damage(struct drwsurf *ds, uint32_t x, uint32_t y, uint32_t w, uint32_t h);
 void drwsurf_resize(struct drwsurf *ds, uint32_t w, uint32_t h, double s);
+void drwsurf_attach(struct drwsurf *ds);
 void drwsurf_flip(struct drwsurf *ds);
 
 typedef union {
@@ -30,19 +43,19 @@ typedef union {
 	uint32_t color;
 } Color;
 
-void drw_do_clear(struct drwsurf *d, uint32_t x, uint32_t y,
+void drw_do_clear(struct drwsurf *ds, uint32_t x, uint32_t y,
                       uint32_t w, uint32_t h);
-void drw_do_rectangle(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
+void drw_do_rectangle(struct drwsurf *ds, Color color, uint32_t x, uint32_t y,
                       uint32_t w, uint32_t h, bool fill, int rounding);
-void drw_fill_rectangle(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
+void drw_fill_rectangle(struct drwsurf *ds, Color color, uint32_t x, uint32_t y,
                         uint32_t w, uint32_t h, int rounding);
-void drw_over_rectangle(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
+void drw_over_rectangle(struct drwsurf *ds, Color color, uint32_t x, uint32_t y,
                         uint32_t w, uint32_t h, int rounding);
 
-void drw_draw_text(struct drwsurf *d, Color color, uint32_t x, uint32_t y,
+void drw_draw_text(struct drwsurf *ds, Color color, uint32_t x, uint32_t y,
                    uint32_t w, uint32_t h, uint32_t b, const char *label,
                    PangoFontDescription *font_description);
 
-uint32_t setup_buffer(struct drwsurf *drwsurf);
+uint32_t setup_buffer(struct drwsurf *ds, struct drwbuf *db);
 
 #endif

keyboard.c

@@ -337,10 +337,7 @@ kbd_release_key(struct kbd *kb, uint32_t time)
         kb->last_swipe = NULL;
     }
 
-    drwsurf_flip(kb->surf);
-
     kbd_clear_last_popup(kb);
-    drwsurf_flip(kb->popup_surf);
 }
 
 void
@@ -366,10 +363,7 @@ kbd_motion_key(struct kbd *kb, uint32_t time, uint32_t x, uint32_t y)
         kbd_unpress_key(kb, time);
     }
 
-    drwsurf_flip(kb->surf);
-
     kbd_clear_last_popup(kb);
-    drwsurf_flip(kb->popup_surf);
 }
 
 void
@@ -501,9 +495,6 @@ kbd_press_key(struct kbd *kb, struct key *k, uint32_t time)
     default:
         break;
     }
-
-    drwsurf_flip(kb->surf);
-    drwsurf_flip(kb->popup_surf);
 }
 
 void
@@ -553,8 +544,13 @@ kbd_clear_last_popup(struct kbd *kb)
     if (kb->last_popup_w && kb->last_popup_h) {
         drw_do_clear(kb->popup_surf, kb->last_popup_x, kb->last_popup_y,
                      kb->last_popup_w, kb->last_popup_h);
-        wl_surface_damage(kb->popup_surf->surf, kb->last_popup_x,
-                          kb->last_popup_y, kb->last_popup_w, kb->last_popup_h);
+        drwsurf_damage(
+            kb->popup_surf,
+            kb->last_popup_x,
+            kb->last_popup_y,
+            kb->last_popup_w,
+            kb->last_popup_h
+        );
 
         kb->last_popup_w = kb->last_popup_h = 0;
     }
@@ -588,7 +584,7 @@ kbd_draw_key(struct kbd *kb, struct key *k, enum key_draw_type type)
 
     drw_draw_text(kb->surf, scheme->text, k->x, k->y, k->w, k->h,
                   KBD_KEY_BORDER, label, scheme->font_description);
-    wl_surface_damage(kb->surf->surf, k->x, k->y, k->w, k->h);
+    drwsurf_damage(kb->surf, k->x, k->y, k->w, k->h);
 
     if (type == Press || type == Unpress) {
         kbd_clear_last_popup(kb);
@@ -605,8 +601,7 @@ kbd_draw_key(struct kbd *kb, struct key *k, enum key_draw_type type)
         drw_draw_text(kb->popup_surf, scheme->text, k->x, kb->last_popup_y,
                       k->w, k->h, KBD_KEY_BORDER, label,
                       scheme->font_description);
-        wl_surface_damage(kb->popup_surf->surf, k->x, kb->last_popup_y, k->w,
-                          k->h);
+        drwsurf_damage(kb->popup_surf, k->x, kb->last_popup_y, k->w, k->h);
     }
 }
 
@@ -633,7 +628,7 @@ kbd_draw_layout(struct kbd *kb)
         }
         next_key++;
     }
-    wl_surface_damage(d->surf, 0, 0, kb->w, kb->h);
+    drwsurf_damage(d, 0, 0, kb->w, kb->h);
 }
 
 void

main.c

@@ -62,6 +62,7 @@ static int wl_outputs_size;
 
 /* drawing */
 static struct drw draw_ctx;
+static struct drwbuf draw_surf_back_buffer, draw_surf_display_buffer, popup_draw_surf_back_buffer, popup_draw_surf_display_buffer;
 static struct drwsurf draw_surf, popup_draw_surf;
 
 /* layer surface parameters */
@@ -332,7 +333,6 @@ wl_pointer_axis(void *data, struct wl_pointer *wl_pointer, uint32_t time,
     }
 
     kbd_next_layer(&keyboard, NULL, (value >= 0));
-    drwsurf_flip(keyboard.surf);
 }
 
 void
@@ -517,7 +517,7 @@ xdg_popup_surface_configure(void *data, struct xdg_surface *xdg_surface,
 {
     xdg_surface_ack_configure(xdg_surface, serial);
     popup_xdg_surface_configured = true;
-    drwsurf_flip(&popup_draw_surf);
+    drwsurf_attach(&popup_draw_surf);
 }
 
 static const struct xdg_surface_listener xdg_popup_surface_listener = {
@@ -664,7 +664,7 @@ layer_surface_configure(void *data, struct zwlr_layer_surface_v1 *surface,
 
         zwlr_layer_surface_v1_ack_configure(surface, serial);
         kbd_resize(&keyboard, layouts, NumLayouts);
-        drwsurf_flip(&draw_surf);
+        drwsurf_attach(&draw_surf);
     } else {
         zwlr_layer_surface_v1_ack_configure(surface, serial);
     }
@@ -1018,7 +1018,11 @@ main(int argc, char **argv)
     }
 
     draw_surf.ctx = &draw_ctx;
+    draw_surf.back_buffer = &draw_surf_back_buffer;
+    draw_surf.display_buffer = &draw_surf_display_buffer;
     popup_draw_surf.ctx = &draw_ctx;
+    popup_draw_surf.back_buffer = &popup_draw_surf_back_buffer;
+    popup_draw_surf.display_buffer = &popup_draw_surf_display_buffer;
     keyboard.surf = &draw_surf;
     keyboard.popup_surf = &popup_draw_surf;