diff --git a/libweston/pixel-formats.c b/libweston/pixel-formats.c
index 23d7d5b9..d0c5403c 100644
--- a/libweston/pixel-formats.c
+++ b/libweston/pixel-formats.c
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2016 Collabora, Ltd.
+ * Copyright © 2016, 2019 Collabora, Ltd.
  * Copyright (c) 2018 DisplayLink (UK) Ltd.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -53,6 +53,12 @@
 #endif
 
 #define DRM_FORMAT(f) .format = DRM_FORMAT_ ## f, .drm_format_name = #f
+#define BITS_RGBA_FIXED(r_, g_, b_, a_) \
+	.bits.r = r_, \
+	.bits.g = g_, \
+	.bits.b = b_, \
+	.bits.a = a_, \
+	.component_type = PIXEL_COMPONENT_TYPE_FIXED
 
 #include "weston-egl-ext.h"
 
@@ -64,20 +70,25 @@
 static const struct pixel_format_info pixel_format_table[] = {
 	{
 		DRM_FORMAT(XRGB4444),
+		BITS_RGBA_FIXED(4, 4, 4, 0),
 	},
 	{
 		DRM_FORMAT(ARGB4444),
+		BITS_RGBA_FIXED(4, 4, 4, 4),
 		.opaque_substitute = DRM_FORMAT_XRGB4444,
 	},
 	{
 		DRM_FORMAT(XBGR4444),
+		BITS_RGBA_FIXED(4, 4, 4, 0),
 	},
 	{
 		DRM_FORMAT(ABGR4444),
+		BITS_RGBA_FIXED(4, 4, 4, 4),
 		.opaque_substitute = DRM_FORMAT_XBGR4444,
 	},
 	{
 		DRM_FORMAT(RGBX4444),
+		BITS_RGBA_FIXED(4, 4, 4, 0),
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 		GL_FORMAT(GL_RGBA),
 		GL_TYPE(GL_UNSIGNED_SHORT_4_4_4_4),
@@ -85,6 +96,7 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(RGBA4444),
+		BITS_RGBA_FIXED(4, 4, 4, 4),
 		.opaque_substitute = DRM_FORMAT_RGBX4444,
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 		GL_FORMAT(GL_RGBA),
@@ -93,29 +105,36 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(BGRX4444),
+		BITS_RGBA_FIXED(4, 4, 4, 0),
 	},
 	{
 		DRM_FORMAT(BGRA4444),
+		BITS_RGBA_FIXED(4, 4, 4, 4),
 		.opaque_substitute = DRM_FORMAT_BGRX4444,
 	},
 	{
 		DRM_FORMAT(XRGB1555),
+		BITS_RGBA_FIXED(5, 5, 5, 0),
 		.depth = 15,
 		.bpp = 16,
 	},
 	{
 		DRM_FORMAT(ARGB1555),
+		BITS_RGBA_FIXED(5, 5, 5, 1),
 		.opaque_substitute = DRM_FORMAT_XRGB1555,
 	},
 	{
 		DRM_FORMAT(XBGR1555),
+		BITS_RGBA_FIXED(5, 5, 5, 0),
 	},
 	{
 		DRM_FORMAT(ABGR1555),
+		BITS_RGBA_FIXED(5, 5, 5, 1),
 		.opaque_substitute = DRM_FORMAT_XBGR1555,
 	},
 	{
 		DRM_FORMAT(RGBX5551),
+		BITS_RGBA_FIXED(5, 5, 5, 0),
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 		GL_FORMAT(GL_RGBA),
 		GL_TYPE(GL_UNSIGNED_SHORT_5_5_5_1),
@@ -123,6 +142,7 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(RGBA5551),
+		BITS_RGBA_FIXED(5, 5, 5, 1),
 		.opaque_substitute = DRM_FORMAT_RGBX5551,
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 		GL_FORMAT(GL_RGBA),
@@ -131,13 +151,16 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(BGRX5551),
+		BITS_RGBA_FIXED(5, 5, 5, 0),
 	},
 	{
 		DRM_FORMAT(BGRA5551),
+		BITS_RGBA_FIXED(5, 5, 5, 1),
 		.opaque_substitute = DRM_FORMAT_BGRX5551,
 	},
 	{
 		DRM_FORMAT(RGB565),
+		BITS_RGBA_FIXED(5, 6, 5, 0),
 		.depth = 16,
 		.bpp = 16,
 # if __BYTE_ORDER == __LITTLE_ENDIAN
@@ -147,17 +170,21 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(BGR565),
+		BITS_RGBA_FIXED(5, 6, 5, 0),
 	},
 	{
 		DRM_FORMAT(RGB888),
+		BITS_RGBA_FIXED(8, 8, 8, 0),
 	},
 	{
 		DRM_FORMAT(BGR888),
+		BITS_RGBA_FIXED(8, 8, 8, 0),
 		GL_FORMAT(GL_RGB),
 		GL_TYPE(GL_UNSIGNED_BYTE),
 	},
 	{
 		DRM_FORMAT(XRGB8888),
+		BITS_RGBA_FIXED(8, 8, 8, 0),
 		.depth = 24,
 		.bpp = 32,
 		GL_FORMAT(GL_BGRA_EXT),
@@ -165,6 +192,7 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(ARGB8888),
+		BITS_RGBA_FIXED(8, 8, 8, 8),
 		.opaque_substitute = DRM_FORMAT_XRGB8888,
 		.depth = 32,
 		.bpp = 32,
@@ -173,40 +201,49 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(XBGR8888),
+		BITS_RGBA_FIXED(8, 8, 8, 0),
 		GL_FORMAT(GL_RGBA),
 		GL_TYPE(GL_UNSIGNED_BYTE),
 	},
 	{
 		DRM_FORMAT(ABGR8888),
+		BITS_RGBA_FIXED(8, 8, 8, 8),
 		.opaque_substitute = DRM_FORMAT_XBGR8888,
 		GL_FORMAT(GL_RGBA),
 		GL_TYPE(GL_UNSIGNED_BYTE),
 	},
 	{
 		DRM_FORMAT(RGBX8888),
+		BITS_RGBA_FIXED(8, 8, 8, 0),
 	},
 	{
 		DRM_FORMAT(RGBA8888),
+		BITS_RGBA_FIXED(8, 8, 8, 8),
 		.opaque_substitute = DRM_FORMAT_RGBX8888,
 	},
 	{
 		DRM_FORMAT(BGRX8888),
+		BITS_RGBA_FIXED(8, 8, 8, 0),
 	},
 	{
 		DRM_FORMAT(BGRA8888),
+		BITS_RGBA_FIXED(8, 8, 8, 8),
 		.opaque_substitute = DRM_FORMAT_BGRX8888,
 	},
 	{
 		DRM_FORMAT(XRGB2101010),
+		BITS_RGBA_FIXED(10, 10, 10, 0),
 		.depth = 30,
 		.bpp = 32,
 	},
 	{
 		DRM_FORMAT(ARGB2101010),
+		BITS_RGBA_FIXED(10, 10, 10, 2),
 		.opaque_substitute = DRM_FORMAT_XRGB2101010,
 	},
 	{
 		DRM_FORMAT(XBGR2101010),
+		BITS_RGBA_FIXED(10, 10, 10, 0),
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 		GL_FORMAT(GL_RGBA),
 		GL_TYPE(GL_UNSIGNED_INT_2_10_10_10_REV_EXT),
@@ -214,6 +251,7 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(ABGR2101010),
+		BITS_RGBA_FIXED(10, 10, 10, 2),
 		.opaque_substitute = DRM_FORMAT_XBGR2101010,
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 		GL_FORMAT(GL_RGBA),
@@ -222,16 +260,20 @@ static const struct pixel_format_info pixel_format_table[] = {
 	},
 	{
 		DRM_FORMAT(RGBX1010102),
+		BITS_RGBA_FIXED(10, 10, 10, 0),
 	},
 	{
 		DRM_FORMAT(RGBA1010102),
+		BITS_RGBA_FIXED(10, 10, 10, 2),
 		.opaque_substitute = DRM_FORMAT_RGBX1010102,
 	},
 	{
 		DRM_FORMAT(BGRX1010102),
+		BITS_RGBA_FIXED(10, 10, 10, 0),
 	},
 	{
 		DRM_FORMAT(BGRA1010102),
+		BITS_RGBA_FIXED(10, 10, 10, 2),
 		.opaque_substitute = DRM_FORMAT_BGRX1010102,
 	},
 	{
diff --git a/libweston/pixel-formats.h b/libweston/pixel-formats.h
index 48395725..3e125260 100644
--- a/libweston/pixel-formats.h
+++ b/libweston/pixel-formats.h
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2016 Collabora, Ltd.
+ * Copyright © 2016, 2019 Collabora, Ltd.
  * Copyright (c) 2018 DisplayLink (UK) Ltd.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -100,6 +100,20 @@ struct pixel_format_info {
 		ORDER_LUMA_CHROMA = 0,
 		ORDER_CHROMA_LUMA,
 	} luma_chroma_order;
+
+	/** How many significant bits each channel has, or zero if N/A. */
+	struct {
+		int r;
+		int g;
+		int b;
+		int a;
+	} bits;
+
+	/** How channel bits are interpreted, fixed (uint) or floating-point */
+	enum {
+		PIXEL_COMPONENT_TYPE_FIXED = 0,
+		PIXEL_COMPONENT_TYPE_FLOAT,
+	} component_type;
 };
 
 /**