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Unified Diff: src/ply-gamma.c

Issue 6877024: Add gamma support to ply-image. (Closed) Base URL: ssh://gitrw.chromium.org:9222/ply-image.git@master
Patch Set: git cl push Created 9 years, 8 months ago
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Index: src/ply-gamma.c
diff --git a/src/ply-gamma.c b/src/ply-gamma.c
new file mode 100644
index 0000000000000000000000000000000000000000..1f4f7b00401bf60b0664466e2adb2f7642b4acf2
--- /dev/null
+++ b/src/ply-gamma.c
@@ -0,0 +1,114 @@
+/* ply-gamma.c - plymouth gamma setup via KMS
+ *
+ * Copyright (C) 2011, The Chromium OS Authors.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ */
+
+#include "ply-gamma.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+static const int kInternalPanel = 1;
+
+typedef struct {
+ uint16_t *red;
+ uint16_t *green;
+ uint16_t *blue;
+} GammaRamp;
+
+static GammaRamp* load_gamma_ramp(const char* file) {
+ const int kGammaSize = 256;
+ int i, r = 0;
+
+ FILE* f = fopen(file, "rb");
+ if (!f)
+ return NULL;
+
+ unsigned char red[kGammaSize], green[kGammaSize], blue[kGammaSize];
+
+ r += fread(red, sizeof(red), 1, f);
+ r += fread(green, sizeof(green), 1, f);
+ r += fread(blue, sizeof(blue), 1, f);
+ fclose(f);
+
+ if (r != 3)
+ return NULL;
+
+ GammaRamp* ramp = (GammaRamp*)malloc(sizeof(GammaRamp));
+ ramp->red = (uint16_t*)malloc(sizeof(uint16_t) * kGammaSize);
+ ramp->green = (uint16_t*)malloc(sizeof(uint16_t) * kGammaSize);
+ ramp->blue = (uint16_t*)malloc(sizeof(uint16_t) * kGammaSize);
+
+ for(i = 0; i < kGammaSize; ++i) {
+ ramp->red[i] = (uint16_t)red[i] * 257;
+ ramp->green[i] = (uint16_t)green[i] * 257;
+ ramp->blue[i] = (uint16_t)blue[i] * 257;
+ }
+
+ return ramp;
+}
+
+static void free_gamma_ramp(GammaRamp* ramp) {
+ free(ramp->red);
+ free(ramp->green);
+ free(ramp->blue);
+ free(ramp);
+}
+
+bool ply_gamma_set(const char* file) {
+ int r;
+ drmModeCrtcPtr mode;
+ GammaRamp* ramp;
+
+ ramp = load_gamma_ramp(file);
+
+ if (!ramp) {
+ fprintf(stderr, "Unable to load gamma ramp\n");
+ return false;
+ }
+
+ int fd = drmOpen("i915", NULL);
+ if (fd < 0) {
+ fprintf(stderr, "Unable to open i915 drm\n");
+ return false;
+ }
+
+ drmModeRes *resources = drmModeGetResources(fd);
+ if (!resources) {
+ fprintf(stderr, "Unable to get mode resources\n");
+ drmClose(fd);
+ return false;
+ }
+
+ mode = drmModeGetCrtc(fd, resources->crtcs[kInternalPanel]);
+ r = drmModeCrtcSetGamma(fd,
+ mode->crtc_id,
+ mode->gamma_size,
+ ramp->red,
+ ramp->green,
+ ramp->blue);
+
+ drmModeFreeResources(resources);
+ drmClose(fd);
+ free_gamma_ramp(ramp);
+ return r >= 0;
+}
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