Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 92 insertions, 0 deletions

diff --git a/include/ui/qemu-pixman.h b/include/ui/qemu-pixman.h
new file mode 100644
index 000000000..806ddcd7c
--- /dev/null
+++ b/include/ui/qemu-pixman.h
@@ -0,0 +1,92 @@
+/*
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_PIXMAN_H
+#define QEMU_PIXMAN_H
+
+/* pixman-0.16.0 headers have a redundant declaration */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wredundant-decls"
+#include <pixman.h>
+#pragma GCC diagnostic pop
+
+/*
+ * pixman image formats are defined to be native endian,
+ * that means host byte order on qemu.  So we go define
+ * fixed formats here for cases where it is needed, like
+ * feeding libjpeg / libpng and writing screenshots.
+ */
+
+#ifdef HOST_WORDS_BIGENDIAN
+# define PIXMAN_BE_r8g8b8     PIXMAN_r8g8b8
+# define PIXMAN_BE_x8r8g8b8   PIXMAN_x8r8g8b8
+# define PIXMAN_BE_a8r8g8b8   PIXMAN_a8r8g8b8
+# define PIXMAN_BE_b8g8r8x8   PIXMAN_b8g8r8x8
+# define PIXMAN_BE_b8g8r8a8   PIXMAN_b8g8r8a8
+# define PIXMAN_BE_r8g8b8x8   PIXMAN_r8g8b8x8
+# define PIXMAN_BE_r8g8b8a8   PIXMAN_r8g8b8a8
+# define PIXMAN_BE_x8b8g8r8   PIXMAN_x8b8g8r8
+# define PIXMAN_BE_a8b8g8r8   PIXMAN_a8b8g8r8
+# define PIXMAN_LE_r8g8b8     PIXMAN_b8g8r8
+# define PIXMAN_LE_a8r8g8b8   PIXMAN_b8g8r8a8
+# define PIXMAN_LE_x8r8g8b8   PIXMAN_b8g8r8x8
+#else
+# define PIXMAN_BE_r8g8b8     PIXMAN_b8g8r8
+# define PIXMAN_BE_x8r8g8b8   PIXMAN_b8g8r8x8
+# define PIXMAN_BE_a8r8g8b8   PIXMAN_b8g8r8a8
+# define PIXMAN_BE_b8g8r8x8   PIXMAN_x8r8g8b8
+# define PIXMAN_BE_b8g8r8a8   PIXMAN_a8r8g8b8
+# define PIXMAN_BE_r8g8b8x8   PIXMAN_x8b8g8r8
+# define PIXMAN_BE_r8g8b8a8   PIXMAN_a8b8g8r8
+# define PIXMAN_BE_x8b8g8r8   PIXMAN_r8g8b8x8
+# define PIXMAN_BE_a8b8g8r8   PIXMAN_r8g8b8a8
+# define PIXMAN_LE_r8g8b8     PIXMAN_r8g8b8
+# define PIXMAN_LE_a8r8g8b8   PIXMAN_a8r8g8b8
+# define PIXMAN_LE_x8r8g8b8   PIXMAN_x8r8g8b8
+#endif
+
+/* -------------------------------------------------------------------- */
+
+typedef struct PixelFormat {
+    uint8_t bits_per_pixel;
+    uint8_t bytes_per_pixel;
+    uint8_t depth; /* color depth in bits */
+    uint32_t rmask, gmask, bmask, amask;
+    uint8_t rshift, gshift, bshift, ashift;
+    uint8_t rmax, gmax, bmax, amax;
+    uint8_t rbits, gbits, bbits, abits;
+} PixelFormat;
+
+PixelFormat qemu_pixelformat_from_pixman(pixman_format_code_t format);
+pixman_format_code_t qemu_default_pixman_format(int bpp, bool native_endian);
+pixman_format_code_t qemu_drm_format_to_pixman(uint32_t drm_format);
+uint32_t qemu_pixman_to_drm_format(pixman_format_code_t pixman);
+int qemu_pixman_get_type(int rshift, int gshift, int bshift);
+pixman_format_code_t qemu_pixman_get_format(PixelFormat *pf);
+bool qemu_pixman_check_format(DisplayChangeListener *dcl,
+                              pixman_format_code_t format);
+
+pixman_image_t *qemu_pixman_linebuf_create(pixman_format_code_t format,
+                                           int width);
+void qemu_pixman_linebuf_fill(pixman_image_t *linebuf, pixman_image_t *fb,
+                              int width, int x, int y);
+void qemu_pixman_linebuf_copy(pixman_image_t *fb, int width, int x, int y,
+                              pixman_image_t *linebuf);
+pixman_image_t *qemu_pixman_mirror_create(pixman_format_code_t format,
+                                          pixman_image_t *image);
+void qemu_pixman_image_unref(pixman_image_t *image);
+
+pixman_color_t qemu_pixman_color(PixelFormat *pf, uint32_t color);
+pixman_image_t *qemu_pixman_glyph_from_vgafont(int height, const uint8_t *font,
+                                               unsigned int ch);
+void qemu_pixman_glyph_render(pixman_image_t *glyph,
+                              pixman_image_t *surface,
+                              pixman_color_t *fgcol,
+                              pixman_color_t *bgcol,
+                              int x, int y, int cw, int ch);
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(pixman_image_t, qemu_pixman_image_unref)
+
+#endif /* QEMU_PIXMAN_H */