1 files changed, 116 insertions, 0 deletions

diff --git a/wayland/buffers.c b/wayland/buffers.c
new file mode 100644
index 00000000..13193423
--- /dev/null
+++ b/wayland/buffers.c
@@ -0,0 +1,116 @@
+#include <wayland-client.h>
+#include <cairo/cairo.h>
+#include <pango/pangocairo.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include "client/buffer.h"
+#include "list.h"
+#include "log.h"
+
+static int create_pool_file(size_t size) {
+    static const char template[] = "/sway-client-XXXXXX";
+    const char *path = getenv("XDG_RUNTIME_DIR");
+        if (!path) {
+        return -1;
+    }
+
+    int ts = (path[strlen(path) - 1] == '/');
+
+    char *name = malloc(
+                strlen(template) +
+                strlen(path) +
+                (ts ? 1 : 0) + 1);
+        sprintf(name, "%s%s%s", path, ts ? "" : "/", template);
+
+    int fd = mkstemp(name);
+    free(name);
+
+    if (fd < 0) {
+        return -1;
+    }
+
+    if (ftruncate(fd, size) < 0) {
+        close(fd);
+        return -1;
+    }
+
+    return fd;
+}
+
+static void buffer_release(void *data, struct wl_buffer *wl_buffer) {
+        struct buffer *buffer = data;
+        buffer->busy = false;
+}
+
+static const struct wl_buffer_listener buffer_listener = {
+        .release = buffer_release
+};
+
+static struct buffer *create_buffer(struct client_state *state, struct buffer *buf,
+                int32_t width, int32_t height, uint32_t format) {
+
+        uint32_t stride = width * 4;
+        uint32_t size = stride * height;
+
+        int fd = create_pool_file(size);
+        void *data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+        struct wl_shm_pool *pool = wl_shm_create_pool(state->shm, fd, size);
+        buf->buffer = wl_shm_pool_create_buffer(pool, 0, width, height, stride, format);
+        wl_shm_pool_destroy(pool);
+        close(fd);
+        fd = -1;
+
+        buf->surface = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, width, height, stride);
+        buf->cairo = cairo_create(buf->surface);
+        buf->pango = pango_cairo_create_context(buf->cairo);
+
+        wl_buffer_add_listener(buf->buffer, &buffer_listener, state);
+        return buf;
+}
+
+static void destroy_buffer(struct buffer *buffer) {
+    if (buffer->buffer) {
+        wl_buffer_destroy(buffer->buffer);
+    }
+    if (buffer->cairo) {
+        cairo_destroy(buffer->cairo);
+    }
+    if (buffer->surface) {
+        cairo_surface_destroy(buffer->surface);
+    }
+    memset(buffer, 0, sizeof(struct buffer));
+}
+
+struct buffer *get_next_buffer(struct client_state *state) {
+    struct buffer *buffer = NULL;
+
+    int i;
+    for (i = 0; i < 2; ++i) {
+        if (state->buffers[i].busy) {
+            continue;
+        }
+        buffer = &state->buffers[i];
+    }
+
+    if (!buffer) {
+        return NULL;
+    }
+
+    if (buffer->width != state->width || buffer->height != state->height) {
+        destroy_buffer(buffer);
+    }
+
+    if (!buffer->buffer) {
+        if (!create_buffer(state, buffer, state->width, state->height, WL_SHM_FORMAT_ARGB8888)) {
+            return NULL;
+        }
+    }
+    
+    state->cairo = buffer->cairo;
+    state->buffer = buffer;
+    return buffer;
+}