compositor-drm: support RGB565 with pixman renderer

At the moment only XRGB8888 is supported when using pixman renderer.
This patch adds support also for RGB565.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Daniel Stone <daniels@collabora.com>

src/compositor-drm.c

@@ -262,10 +262,12 @@ drm_fb_destroy_callback(struct gbm_bo *bo, void *data)
 }
 
 static struct drm_fb *
-drm_fb_create_dumb(struct drm_backend *b, unsigned width, unsigned height)
+drm_fb_create_dumb(struct drm_backend *b, unsigned width, unsigned height,
+		   uint32_t format)
 {
 	struct drm_fb *fb;
 	int ret;
+	uint32_t bpp, depth;
 
 	struct drm_mode_create_dumb create_arg;
 	struct drm_mode_destroy_dumb destroy_arg;
@@ -275,8 +277,20 @@ drm_fb_create_dumb(struct drm_backend *b, unsigned width, unsigned height)
 	if (!fb)
 		return NULL;
 
+	switch (format) {
+		case GBM_FORMAT_XRGB8888:
+			bpp = 32;
+			depth = 24;
+			break;
+		case GBM_FORMAT_RGB565:
+			bpp = depth = 16;
+			break;
+		default:
+			return NULL;
+	}
+
 	memset(&create_arg, 0, sizeof create_arg);
-	create_arg.bpp = 32;
+	create_arg.bpp = bpp;
 	create_arg.width = width;
 	create_arg.height = height;
 
@@ -289,8 +303,29 @@ drm_fb_create_dumb(struct drm_backend *b, unsigned width, unsigned height)
 	fb->size = create_arg.size;
 	fb->fd = b->drm.fd;
 
-	ret = drmModeAddFB(b->drm.fd, width, height, 24, 32,
-			   fb->stride, fb->handle, &fb->fb_id);
+	ret = -1;
+
+	if (!b->no_addfb2) {
+		uint32_t handles[4], pitches[4], offsets[4];
+
+		handles[0] = fb->handle;
+		pitches[0] = fb->stride;
+		offsets[0] = 0;
+
+		ret = drmModeAddFB2(b->drm.fd, width, height,
+				    format, handles, pitches, offsets,
+				    &fb->fb_id, 0);
+		if (ret) {
+			weston_log("addfb2 failed: %m\n");
+			b->no_addfb2 = 1;
+		}
+	}
+
+	if (ret) {
+		ret = drmModeAddFB(b->drm.fd, width, height, depth, bpp,
+				   fb->stride, fb->handle, &fb->fb_id);
+	}
+
 	if (ret)
 		goto err_bo;
 
@@ -1879,17 +1914,30 @@ drm_output_init_pixman(struct drm_output *output, struct drm_backend *b)
 {
 	int w = output->base.current_mode->width;
 	int h = output->base.current_mode->height;
+	uint32_t format = output->gbm_format;
+	uint32_t pixman_format;
 	unsigned int i;
 
-	/* FIXME error checking */
+	switch (format) {
+		case GBM_FORMAT_XRGB8888:
+			pixman_format = PIXMAN_x8r8g8b8;
+			break;
+		case GBM_FORMAT_RGB565:
+			pixman_format = PIXMAN_r5g6b5;
+			break;
+		default:
+			weston_log("Unsupported pixman format 0x%x\n", format);
+			return -1;
+	}
 
+	/* FIXME error checking */
 	for (i = 0; i < ARRAY_LENGTH(output->dumb); i++) {
-		output->dumb[i] = drm_fb_create_dumb(b, w, h);
+		output->dumb[i] = drm_fb_create_dumb(b, w, h, format);
 		if (!output->dumb[i])
 			goto err;
 
 		output->image[i] =
-			pixman_image_create_bits(PIXMAN_x8r8g8b8, w, h,
+			pixman_image_create_bits(pixman_format, w, h,
 						 output->dumb[i]->map,
 						 output->dumb[i]->stride);
 		if (!output->image[i])