Add intel_framebuffer_dump

A simple utility to capture the currently active framebuffers and record
them as a png.

tools/Makefile.am

@@ -9,6 +9,7 @@ bin_PROGRAMS = 				\
 	intel_bios_dumper 		\
 	intel_bios_reader 		\
 	intel_error_decode 		\
+	intel_framebuffer_dump 		\
 	intel_gpu_top 			\
 	intel_gpu_time 			\
 	intel_gtt 			\

tools/intel_framebuffer_dump.c

@@ -0,0 +1,111 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/*
+ * Read back all the KMS framebuffers attached to the CRTC and record as PNG.
+ */
+
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <xf86drmMode.h>
+#include <i915_drm.h>
+#include <cairo.h>
+
+#include "intel_gpu_tools.h"
+#include "drmtest.h"
+
+int main(int argc, char **argv)
+{
+	drmModeResPtr res;
+	int fd, n;
+
+	fd = drmOpen("i915", NULL);
+	if (fd < 0)
+		return ENOENT;
+
+	res = drmModeGetResources(fd);
+	if (res == NULL)
+		return ENOMEM;
+
+	for (n = 0; n < res->count_crtcs; n++) {
+		struct drm_gem_open open_arg;
+		struct drm_gem_flink flink;
+		drmModeCrtcPtr crtc;
+		drmModeFBPtr fb;
+
+		crtc = drmModeGetCrtc(fd, res->crtcs[n]);
+		if (crtc == NULL)
+			continue;
+
+		fb = drmModeGetFB(fd, crtc->buffer_id);
+		drmModeFreeCrtc(crtc);
+		if (fb == NULL)
+			continue;
+
+		flink.handle = fb->handle;
+		if (drmIoctl(fd, DRM_IOCTL_GEM_FLINK, &flink)) {
+			drmModeFreeFB(fb);
+			continue;
+		}
+
+		open_arg.name = flink.name;
+		if (drmIoctl(fd, DRM_IOCTL_GEM_OPEN, &open_arg) == 0) {
+			struct drm_i915_gem_mmap_gtt mmap_arg;
+			void *ptr;
+
+						mmap_arg.handle = open_arg.handle;
+			if (drmIoctl(fd, DRM_IOCTL_I915_GEM_MMAP_GTT, &mmap_arg) == 0 &&
+			    (ptr = mmap(0, open_arg.size, PROT_READ, MAP_SHARED, fd, mmap_arg.offset)) != (void *)-1) {
+				cairo_surface_t *surface;
+				cairo_format_t format;
+				char name[80];
+
+				snprintf(name, sizeof(name), "fb-%d.png",  fb->fb_id);
+
+				switch (fb->depth) {
+				case 16: format = CAIRO_FORMAT_RGB16_565; break;
+				case 24: format = CAIRO_FORMAT_RGB24; break;
+				case 30: format = CAIRO_FORMAT_RGB30; break;
+				case 32: format = CAIRO_FORMAT_ARGB32; break;
+				default: format = CAIRO_FORMAT_INVALID; break;
+				}
+
+				surface = cairo_image_surface_create_for_data(ptr, format,
+									      fb->width, fb->height, fb->pitch);
+				cairo_surface_write_to_png(surface, name);
+				cairo_surface_destroy(surface);
+
+				munmap(ptr, open_arg.size);
+			}
+			drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &open_arg.handle);
+		}
+
+		drmModeFreeFB(fb);
+	}
+
+	return 0;
+}