+static int
+dri2_get_bytes_per_pixel(struct dri2_egl_surface *dri2_surf)
+{
+ const int depth = dri2_surf->base.Config->BufferSize;
+ return depth ? util_next_power_of_two(depth / 8) : 0;
+}
+
+static void
+dri2_put_image(__DRIdrawable * draw, int op,
+ int x, int y, int w, int h,
+ char *data, void *loaderPrivate)
+{
+ struct dri2_egl_surface *dri2_surf = loaderPrivate;
+ const int bpp = dri2_get_bytes_per_pixel(dri2_surf);
+ const int width = dri2_surf->base.Width;
+ const int height = dri2_surf->base.Height;
+ const int dst_stride = width*bpp;
+ const int src_stride = w*bpp;
+ const int x_offset = x*bpp;
+ int copy_width = src_stride;
+
+ if (!dri2_surf->swrast_device_buffer)
+ dri2_surf->swrast_device_buffer = malloc(height*dst_stride);
+
+ if (dri2_surf->swrast_device_buffer) {
+ const char *src = data;
+ char *dst = dri2_surf->swrast_device_buffer;
+
+ dst += x_offset;
+ dst += y*dst_stride;
+
+ /* Drivers are allowed to submit OOB PutImage requests, so clip here. */
+ if (copy_width > dst_stride - x_offset)
+ copy_width = dst_stride - x_offset;
+ if (h > height - y)
+ h = height - y;
+
+ for (; 0 < h; --h) {
+ memcpy(dst, src, copy_width);
+ dst += dst_stride;
+ src += src_stride;
+ }
+ }
+}
+
+static void
+dri2_get_image(__DRIdrawable * read,
+ int x, int y, int w, int h,
+ char *data, void *loaderPrivate)
+{
+ struct dri2_egl_surface *dri2_surf = loaderPrivate;
+ const int bpp = dri2_get_bytes_per_pixel(dri2_surf);
+ const int width = dri2_surf->base.Width;
+ const int height = dri2_surf->base.Height;
+ const int src_stride = width*bpp;
+ const int dst_stride = w*bpp;
+ const int x_offset = x*bpp;
+ int copy_width = dst_stride;
+ const char *src = dri2_surf->swrast_device_buffer;
+ char *dst = data;
+
+ if (!src) {
+ memset(data, 0, copy_width * h);
+ return;
+ }
+
+ src += x_offset;
+ src += y*src_stride;
+
+ /* Drivers are allowed to submit OOB GetImage requests, so clip here. */
+ if (copy_width > src_stride - x_offset)
+ copy_width = src_stride - x_offset;
+ if (h > height - y)
+ h = height - y;
+
+ for (; 0 < h; --h) {
+ memcpy(dst, src, copy_width);
+ src += src_stride;
+ dst += dst_stride;
+ }
+
+}
+
+/* HACK: technically we should have swrast_null, instead of these.