[PATCH libdrm 2/2] tests/modeprint: Print details for IN_FORMATS blob

["Wladimir J. van der Laan" <laanwj@xxxxxxxxx>]

Pretty-print formats and modifiers in IN_FORMATS blob.

Signed-off-by: Wladimir J. van der Laan <laanwj@xxxxxxxxx>
---
 tests/modeprint/modeprint.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tests/modeprint/modeprint.c b/tests/modeprint/modeprint.c
index 42c0a1b..ce84279 100644
--- a/tests/modeprint/modeprint.c
+++ b/tests/modeprint/modeprint.c
@@ -93,6 +93,28 @@ static int printMode(struct drm_mode_modeinfo *mode)
 	return 0;
 }
 
+static int printBlob(const char *name, void *data, uint32_t length)
+{
+	if (!strcmp(name, "IN_FORMATS")) {
+		struct drm_format_modifier_blob *m = data;
+		uint32_t *fmts = (uint32_t *)(((char *)data) + m->formats_offset);
+		struct drm_format_modifier *mod = (struct drm_format_modifier *)(((char *)data) + m->modifiers_offset);
+		int i,j,k;
+		printf("\tmodifiers    :\n");
+		for (j = 0; j < (int)m->count_modifiers; j++) {
+			printf("\t\t0x%016" PRIx64, mod[j].modifier);
+			for (i = 0; i < 64 && (i + mod[j].offset) < (int)m->count_formats; i++) {
+				if (mod[j].formats & (1<<i)) {
+					k = i + mod[j].offset;
+					printf(" %c%c%c%c", fmts[k] >> 24, fmts[k] >> 16, fmts[k] >> 8, fmts[k] >> 0);
+				}
+			}
+			printf("\n");
+		}
+	}
+	return 0;
+}
+
 static int printProperty(int fd, drmModePropertyPtr props, uint64_t value)
 {
 	const char *name = NULL;
@@ -120,6 +142,7 @@ static int printProperty(int fd, drmModePropertyPtr props, uint64_t value)
 		blob = drmModeGetPropertyBlob(fd, value);
 		if (blob) {
 			printf("blob is %d length, %08X\n", blob->length, *(uint32_t *)blob->data);
+			printBlob(props->name, blob->data, blob->length);
 			drmModeFreePropertyBlob(blob);
 		} else {
 			printf("error getting blob %" PRIu64 "\n", value);
-- 
2.7.4

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