ui/pixman: add qemu_pixman_check_format

Convinience check_format function for UIs using pixman.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/include/ui/qemu-pixman.h b/include/ui/qemu-pixman.h
index 381969d97b16bfb673e922892a99afb15dd66ae4..3dee5761cc5c411ae9330bb4783d85b10d395ad7 100644 (file)
--- a/include/ui/qemu-pixman.h
+++ b/include/ui/qemu-pixman.h
@@ -37,6 +37,8 @@ PixelFormat qemu_pixelformat_from_pixman(pixman_format_code_t format);
 pixman_format_code_t qemu_default_pixman_format(int bpp, bool native_endian);
 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);

diff --git a/ui/qemu-pixman.c b/ui/qemu-pixman.c
index 6a889e93e7d5349a1f708fa7c4aea0f5ea53fa26..4116e1507b68d5e9e5a04e3020bce6bfb3502b8f 100644 (file)
--- a/ui/qemu-pixman.c
+++ b/ui/qemu-pixman.c
@@ -125,6 +125,33 @@ pixman_format_code_t qemu_pixman_get_format(PixelFormat *pf)
     return format;
 }
 
+/*
+ * Return true for known-good pixman conversions.
+ *
+ * UIs using pixman for format conversion can hook this into
+ * DisplayChangeListenerOps->dpy_gfx_check_format
+ */
+bool qemu_pixman_check_format(DisplayChangeListener *dcl,
+                              pixman_format_code_t format)
+{
+    switch (format) {
+    /* 32 bpp */
+    case PIXMAN_x8r8g8b8:
+    case PIXMAN_a8r8g8b8:
+    case PIXMAN_b8g8r8x8:
+    case PIXMAN_b8g8r8a8:
+    /* 24 bpp */
+    case PIXMAN_r8g8b8:
+    case PIXMAN_b8g8r8:
+    /* 16 bpp */
+    case PIXMAN_x1r5g5b5:
+    case PIXMAN_r5g6b5:
+        return true;
+    default:
+        return false;
+    }
+}
+
 pixman_image_t *qemu_pixman_linebuf_create(pixman_format_code_t format,
                                            int width)
 {