From 57b18d26d09f5219fe0458dcdd06fd2c817c294e Mon Sep 17 00:00:00 2001
From: Alexander Orzechowski <alex@ozal.ski>
Date: Mon, 19 Jun 2023 01:43:15 -0400
Subject: [PATCH] wlr_texture: Introduce wlr_texture_preferred_read_format

---
 include/wlr/render/interface.h   | 1 +
 include/wlr/render/wlr_texture.h | 2 ++
 render/wlr_texture.c             | 9 +++++++++
 3 files changed, 12 insertions(+)

diff --git a/include/wlr/render/interface.h b/include/wlr/render/interface.h
index 29a78f92..befd2fdc 100644
--- a/include/wlr/render/interface.h
+++ b/include/wlr/render/interface.h
@@ -54,6 +54,7 @@ struct wlr_texture_impl {
 		struct wlr_buffer *buffer, const pixman_region32_t *damage);
 	bool (*read_pixels)(struct wlr_texture *texture,
 		const struct wlr_texture_read_pixels_options *options);
+	uint32_t (*preferred_read_format)(struct wlr_texture *texture);
 	void (*destroy)(struct wlr_texture *texture);
 };
 
diff --git a/include/wlr/render/wlr_texture.h b/include/wlr/render/wlr_texture.h
index c24cfaa9..1e352c6e 100644
--- a/include/wlr/render/wlr_texture.h
+++ b/include/wlr/render/wlr_texture.h
@@ -42,6 +42,8 @@ struct wlr_texture_read_pixels_options {
 bool wlr_texture_read_pixels(struct wlr_texture *texture,
 	const struct wlr_texture_read_pixels_options *options);
 
+uint32_t wlr_texture_preferred_read_format(struct wlr_texture *texture);
+
 /**
  * Create a new texture from raw pixel data. `stride` is in bytes. The returned
  * texture is mutable.
diff --git a/render/wlr_texture.c b/render/wlr_texture.c
index 3496305f..3526ee14 100644
--- a/render/wlr_texture.c
+++ b/render/wlr_texture.c
@@ -1,4 +1,5 @@
 #include <assert.h>
+#include <drm_fourcc.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
@@ -61,6 +62,14 @@ bool wlr_texture_read_pixels(struct wlr_texture *texture,
 	return texture->impl->read_pixels(texture, options);
 }
 
+uint32_t wlr_texture_preferred_read_format(struct wlr_texture *texture) {
+	if (!texture->impl->preferred_read_format) {
+		return DRM_FORMAT_INVALID;
+	}
+
+	return texture->impl->preferred_read_format(texture);
+}
+
 struct wlr_texture *wlr_texture_from_pixels(struct wlr_renderer *renderer,
 		uint32_t fmt, uint32_t stride, uint32_t width, uint32_t height,
 		const void *data) {