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-rw-r--r--src/lib/fake-quartz-cg.c314
1 files changed, 314 insertions, 0 deletions
diff --git a/src/lib/fake-quartz-cg.c b/src/lib/fake-quartz-cg.c
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+++ b/src/lib/fake-quartz-cg.c
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+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This library 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 library. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef FAKE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS
+# error Compiling fake-quartz-cg.c without FAKE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS
+#endif
+
+/* This file very sloppily translates Mac OS X Quartz calls to X RandR calls.
+ * It should by no means be used, without additional modification, as a
+ * part of a compatibility layer. The purpose of this file is only to make
+ * it possible to test for logical errors in Max OS X specific code on
+ * a GNU/Linux system under X. */
+
+
+#include "fake-quartz-cg.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+#ifndef HAVE_LIBGAMMA_METHOD_X_RANDR
+
+CGError CGGetOnlineDisplayList(uint32_t max_size,
+ CGDirectDisplayID* restrict displays_out, uint32_t* restrict count_out)
+{
+ uint32_t i;
+ for (i = 0; (i < max_size) && (i < 2); i++)
+ displays_out[i] = (CGDirectDisplayID)i;
+ *count_out = i;
+
+ return kCGErrorSuccess;
+}
+
+
+CGError CGSetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size, const CGGammaValue* red,
+ const CGGammaValue* green, const CGGammaValue* blue)
+{
+ (void) display;
+ (void) red;
+ (void) green;
+ (void) blue;
+
+ if (gamma_size != 256)
+ {
+ fprintf(stderr, "Gamma size should be 256.\n");
+ abort();
+ }
+
+ return kCGErrorSuccess;
+}
+
+
+CGError CGGetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size,
+ CGGammaValue* restrict red, CGGammaValue* restrict green,
+ CGGammaValue* restrict blue, uint32_t* restrict gamma_size_out)
+{
+ long i;
+ (void) display;
+
+ if (gamma_size != 256)
+ {
+ fprintf(stderr, "Gamma size should be 256.\n");
+ abort();
+ }
+
+ *gamma_size_out = 256;
+
+ for (i = 0; i < 256; i++)
+ red[i] = green[i] = blue[i] = (CGGammaValue)i / 255;
+
+ return kCGErrorSuccess;
+}
+
+void CGDisplayRestoreColorSyncSettings(void)
+{
+ /* Do nothing. */
+}
+
+uint32_t CGDisplayGammaTableCapacity(CGDirectDisplayID display)
+{
+ (void) display;
+ return 256;
+}
+
+void close_fake_quartz(void)
+{
+ /* Do nothing. */
+}
+
+
+#else
+
+#include <xcb/xcb.h>
+#include <xcb/randr.h>
+
+
+
+static xcb_connection_t* restrict connection = NULL;
+static xcb_randr_get_screen_resources_current_reply_t* restrict res_reply = NULL;
+static uint32_t crtc_count = 0;
+static xcb_randr_crtc_t* restrict crtcs = NULL;
+static uint16_t* restrict original_ramps = NULL;
+
+
+
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Waggregate-return"
+
+CGError CGGetOnlineDisplayList(uint32_t max_size,
+ CGDirectDisplayID* restrict displays_out, uint32_t* restrict count_out)
+{
+ uint32_t i;
+
+ if (connection == NULL)
+ {
+ xcb_generic_error_t* error;
+ xcb_screen_iterator_t iter;
+ xcb_randr_get_screen_resources_current_cookie_t res_cookie;
+ xcb_randr_get_crtc_gamma_cookie_t gamma_cookie;
+ xcb_randr_get_crtc_gamma_reply_t* restrict gamma_reply;
+
+ connection = xcb_connect(NULL, NULL);
+
+ iter = xcb_setup_roots_iterator(xcb_get_setup(connection));
+ res_cookie = xcb_randr_get_screen_resources_current(connection, iter.data->root);
+ res_reply = xcb_randr_get_screen_resources_current_reply(connection, res_cookie, &error);
+
+ if (error)
+ {
+ fprintf(stderr, "Failed to open X connection.\n");
+ xcb_disconnect(connection);
+ crtc_count = 0;
+ return ~kCGErrorSuccess;
+ }
+
+ crtc_count = (uint32_t)(res_reply->num_crtcs);
+ crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply);
+
+ original_ramps = malloc(crtc_count * 3 * 256 * sizeof(uint16_t));
+ if (original_ramps == NULL)
+ {
+ perror("malloc");
+ xcb_disconnect(connection);
+ crtc_count = 0;
+ return ~kCGErrorSuccess;
+ }
+
+ for (i = 0; i < crtc_count; i++)
+ {
+ gamma_cookie = xcb_randr_get_crtc_gamma(connection, crtcs[i]);
+ gamma_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_cookie, &error);
+
+ if (error)
+ {
+ fprintf(stderr, "Failed to read gamma ramps.\n");
+ xcb_disconnect(connection);
+ crtc_count = 0;
+ return ~kCGErrorSuccess;
+ }
+
+#define __DEST(C) original_ramps + (C + 3 * i) * 256
+#define __SRC(C) xcb_randr_get_crtc_gamma_##C(gamma_reply)
+ memcpy(__DEST(0), __SRC(red), 256 * sizeof(uint16_t));
+ memcpy(__DEST(1), __SRC(green), 256 * sizeof(uint16_t));
+ memcpy(__DEST(2), __SRC(blue), 256 * sizeof(uint16_t));
+#undef __SRC
+#undef __DEST
+
+ free(gamma_reply);
+ }
+ }
+
+ for (i = 0; (i < max_size) && (i < crtc_count); i++)
+ *(displays_out + i) = (CGDirectDisplayID)i;
+
+ *count_out = i;
+ return kCGErrorSuccess;
+}
+
+
+CGError CGSetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size, const CGGammaValue* red,
+ const CGGammaValue* green, const CGGammaValue* blue)
+{
+ xcb_void_cookie_t gamma_cookie;
+ uint16_t r_int[256];
+ uint16_t g_int[256];
+ uint16_t b_int[256];
+ long i;
+ int32_t v;
+
+ if (gamma_size != 256)
+ {
+ fprintf(stderr, "Gamma size should be 256.\n");
+ abort();
+ }
+
+ for (i = 0; i < 256; i++)
+ {
+ v = (int32_t)(red[i] * UINT16_MAX);
+ r_int[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
+
+ v = (int32_t)(green[i] * UINT16_MAX);
+ g_int[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
+
+ v = (int32_t)(blue[i] * UINT16_MAX);
+ b_int[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
+ }
+
+ gamma_cookie = xcb_randr_set_crtc_gamma_checked(connection, crtcs[display],
+ (uint16_t)gamma_size, r_int, g_int, b_int);
+ return xcb_request_check(connection, gamma_cookie) == NULL ? kCGErrorSuccess : ~kCGErrorSuccess;
+}
+
+
+CGError CGGetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size,
+ CGGammaValue* restrict red, CGGammaValue* restrict green,
+ CGGammaValue* restrict blue, uint32_t* restrict gamma_size_out)
+{
+ xcb_randr_get_crtc_gamma_cookie_t gamma_cookie;
+ xcb_randr_get_crtc_gamma_reply_t* restrict gamma_reply;
+ xcb_generic_error_t* error;
+ uint16_t* restrict r_int;
+ uint16_t* restrict g_int;
+ uint16_t* restrict b_int;
+ long i;
+
+ if (gamma_size != 256)
+ {
+ fprintf(stderr, "Gamma size should be 256.\n");
+ abort();
+ }
+
+ *gamma_size_out = 256;
+
+ gamma_cookie = xcb_randr_get_crtc_gamma(connection, crtcs[display]);
+ gamma_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_cookie, &error);
+
+ if (error)
+ {
+ fprintf(stderr, "Failed to write gamma ramps.\n");
+ return ~kCGErrorSuccess;
+ }
+
+ r_int = xcb_randr_get_crtc_gamma_red(gamma_reply);
+ g_int = xcb_randr_get_crtc_gamma_green(gamma_reply);
+ b_int = xcb_randr_get_crtc_gamma_blue(gamma_reply);
+
+ for (i = 0; i < 256; i++)
+ {
+ red[i] = (CGGammaValue)(r_int[i]) / UINT16_MAX;
+ green[i] = (CGGammaValue)(g_int[i]) / UINT16_MAX;
+ blue[i] = (CGGammaValue)(b_int[i]) / UINT16_MAX;
+ }
+
+ free(gamma_reply);
+ return kCGErrorSuccess;
+}
+
+
+void CGDisplayRestoreColorSyncSettings(void)
+{
+ xcb_generic_error_t* error;
+ xcb_void_cookie_t gamma_cookie;
+ uint32_t i;
+
+ for (i = 0; i < crtc_count; i++)
+ {
+ gamma_cookie = xcb_randr_set_crtc_gamma_checked(connection, crtcs[i], 256,
+ original_ramps + (0 + 3 * i) * 256,
+ original_ramps + (1 + 3 * i) * 256,
+ original_ramps + (2 + 3 * i) * 256);
+ if ((error = xcb_request_check(connection, gamma_cookie)))
+ fprintf(stderr, "Quartz gamma reset emulation with RandR returned %i\n", error->error_code);
+ }
+}
+
+
+uint32_t CGDisplayGammaTableCapacity(CGDirectDisplayID display)
+{
+ (void) display;
+ return 256;
+}
+
+# pragma GCC diagnostic pop
+
+
+void close_fake_quartz_cg(void)
+{
+ free(res_reply);
+ res_reply = NULL;
+ if (connection != NULL)
+ xcb_disconnect(connection);
+ connection = NULL;
+ free(original_ramps);
+ original_ramps = NULL;
+}
+
+#endif
+
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