Split source files, merge public header files, eliminite use gpp, rewrite makefile

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 447 insertions, 0 deletions

diff --git a/fake-quartz-cg.c b/fake-quartz-cg.c
new file mode 100644
index 0000000..75f1fb2
--- /dev/null
+++ b/fake-quartz-cg.c
@@ -0,0 +1,447 @@
+/* See LICENSE file for copyright and license details. */
+#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
+/* Use dummy translation */
+
+
+/**
+ * Get a list of all online displays on the system
+ * 
+ * @param   max_size      The number of elements allocated for `displays_out`
+ * @param   displays_out  List ot fill with the ID for each online display on the system
+ * @param   count_out     Output parameter for the number of elements stored in `displays_out`
+ *                        if `displays_out` is too small to fit all display ID:s,
+ *                        `*count_out` will be `max_size`
+ * @return                `kCGErrorSuccess` on success, and error number of failure
+ */
+CGError
+CGGetOnlineDisplayList(uint32_t max_size, CGDirectDisplayID *restrict displays_out, uint32_t *restrict count_out)
+{
+	/* Pretend that we have 2 CRTC:s */
+	uint32_t i;
+	for (i = 0; i < max_size && i < 2; i++)
+		displays_out[i] = (CGDirectDisplayID)i;
+	*count_out = i;
+	return kCGErrorSuccess;
+}
+
+
+/**
+ * Set the gamma ramps for a display
+ * 
+ * @param   display     The ID of the display
+ * @param   gamma_size  The number of stops in gamma ramps
+ * @param   red         The gamma ramp for the red channel
+ * @param   green       The gamma ramp for the green channel
+ * @param   blue        The gamma ramp for the blue channel
+ * @return              `kCGErrorSuccess` on success, and error number of failure
+ */
+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;
+
+	/* We pretend that our gamma ramps are of size 256 */
+	if (gamma_size != 256) {
+		fprintf(stderr, "Gamma size should be 256\n");
+		abort();
+	}
+	return kCGErrorSuccess;
+}
+
+
+/**
+ * Get the current gamma ramps for a display
+ * 
+ * @param   display         The ID of the display
+ * @param   gamma_size      The number of stops you have allocated for the gamma ramps
+ * @param   red             Table allocated for the gamma ramp for the red channel
+ * @param   green           Table allocated for the gamma ramp for the green channel
+ * @param   blue            Table allocated for the gamma ramp for the blue channel
+ * @param   gamma_size_out  Output parameter for the actual number of stops in the gamma ramps
+ * @return                  `kCGErrorSuccess` on success, and error number of failure
+ */
+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;
+
+	/* We pretend that our gamma ramps are of size 256 */
+	if (gamma_size != 256) {
+		fprintf(stderr, "Gamma size should be 256\n");
+		abort();
+	}
+
+	/* We pretend that our gamma ramps are of size 256 */
+	*gamma_size_out = 256;
+
+	/* Pretend that our gamma ramps are identity mappings */
+	for (i = 0; i < 256; i++)
+		red[i] = green[i] = blue[i] = (CGGammaValue)i / 255;
+
+	return kCGErrorSuccess;
+}
+
+
+/**
+ * Restore each display's gamma ramps to the settings in ColorSync
+ */
+void
+CGDisplayRestoreColorSyncSettings(void)
+{
+	/* Do nothing */
+}
+
+
+/**
+ * Get the number of stops in the gamma ramps for a display
+ * 
+ * @param   display  The ID of the display
+ * @return           The number of stops in the gamma ramps
+ */
+uint32_t
+CGDisplayGammaTableCapacity(CGDirectDisplayID display)
+{
+	/* We pretend that our gamma ramps are of size 256 */
+	(void) display;
+	return 256;
+}
+
+
+/**
+ * Release resources used by the backend
+ */
+void
+close_fake_quartz(void)
+{
+	/* Do nothing */
+}
+
+
+#else
+/* Use translation to X RandR */
+
+
+#include <xcb/xcb.h>
+#include <xcb/randr.h>
+
+
+
+/**
+ * Connection to the X RandR display
+ */
+static xcb_connection_t *restrict connection = NULL;
+
+/**
+ * Resouces for the screen
+ * 
+ * We only have one screen, again this
+ * is a very sloppy compatibility layer
+ */
+static xcb_randr_get_screen_resources_current_reply_t *restrict res_reply = NULL;
+
+/**
+ * The number of available CRTC:s
+ */
+static uint32_t crtc_count = 0;
+
+/**
+ * List of X RandR CRTC:s
+ */
+static xcb_randr_crtc_t *restrict crtcs = NULL;
+
+/**
+ * The original gamma ramps, used to emulate gamma ramp restoration to system settings
+ */
+static uint16_t *restrict original_ramps = NULL;
+
+
+
+/* xcb violates the rule to never return struct:s */
+#ifdef __GNUC__
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Waggregate-return"
+#endif
+
+
+/**
+ * Get a list of all online displays on the system
+ * 
+ * @param   max_size      The number of elements allocated for `displays_out`
+ * @param   displays_out  List ot fill with the ID for each online display on the system
+ * @param   count_out     Output parameter for the number of elements stored in `displays_out`,
+ *                        if `displays_out` is too small to fit all display ID:s,
+ *                        `*count_out` will be `max_size`
+ * @return                `kCGErrorSuccess` on success, and error number of failure
+ */
+CGError
+CGGetOnlineDisplayList(uint32_t max_size, CGDirectDisplayID *restrict displays_out, uint32_t *restrict count_out)
+{
+	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;
+	uint32_t i;
+
+	/* Connect to the display and get screen data if not already done so */
+	if (!connection) {
+		/* Connect to the display */
+		connection = xcb_connect(NULL, NULL);
+		/* Get the first screen */
+		iter = xcb_setup_roots_iterator(xcb_get_setup(connection));
+		/* Get the resources of the screen */
+		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;
+		}
+
+		/* Get the number of CRTC:s */
+		crtc_count = (uint32_t)(res_reply->num_crtcs);
+		/* Get the CRTC ID:s */
+		crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply);
+
+		/* Allocate memory where we store the gamma ramps as
+		 * they looked when this adjustment method was first
+		 * used. This is used to emulate the functionality of
+		 * `CGDisplayRestoreColorSyncSettings` which restore the
+		 * all gamma ramps on the system to the system settnigs.
+		 */
+		original_ramps = malloc(crtc_count * 3 * 256 * sizeof(uint16_t));
+		if (!original_ramps) {
+			perror("malloc");
+			xcb_disconnect(connection);
+			crtc_count = 0;
+			return ~kCGErrorSuccess;
+		}
+
+		/* Fill the gamma ramps we just allocated */
+		for (i = 0; i < crtc_count; i++) {
+			/* Read current gamma ramps */
+			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;
+			}
+
+			/* Copy over the gamma ramps to the memory area we have allocated */
+#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
+
+			/* Release resouces */
+			free(gamma_reply);
+		}
+	}
+
+	/* Return CRTC ID:s */
+	for (i = 0; i < max_size && i < crtc_count; i++)
+		displays_out[i] = (CGDirectDisplayID)i;
+
+	/* Return the number of CRTC ID:s we returned */
+	*count_out = i;
+	return kCGErrorSuccess;
+}
+
+
+/**
+ * Set the gamma ramps for a display
+ * 
+ * @param   display     The ID of the display
+ * @param   gamma_size  The number of stops in gamma ramps
+ * @param   red         The gamma ramp for the red channel
+ * @param   green       The gamma ramp for the green channel
+ * @param   blue        The gamma ramp for the blue channel
+ * @return              `kCGErrorSuccess` on success, and error number of failure
+ */
+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], g_int[256], b_int[256];
+	int32_t v;
+	long i;
+
+	/* This is a sloppy compatibility layer that assumes the gamma ramp size is 256 */
+	if (gamma_size != 256) {
+		fprintf(stderr, "Gamma size should be 256.\n");
+		abort();
+	}
+
+	/* Translate the gamma ramps from float (CoreGraphics) to 16-bit unsigned integer (X RandR) */
+	for (i = 0; i < 256; i++) {
+		/* Red channel */
+		v = (int32_t)(red[i] * UINT16_MAX);
+		r_int[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
+
+		/* Green channel */
+		v = (int32_t)(green[i] * UINT16_MAX);
+		g_int[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
+
+		/* Blue channel */
+		v = (int32_t)(blue[i] * UINT16_MAX);
+		b_int[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
+	}
+
+	/* Apply gamma ramps */
+	gamma_cookie = xcb_randr_set_crtc_gamma_checked(connection, crtcs[display], (uint16_t)gamma_size, r_int, g_int, b_int);
+	/* Check for errors */
+	return !xcb_request_check(connection, gamma_cookie) ? kCGErrorSuccess : ~kCGErrorSuccess;
+}
+
+
+/**
+ * Get the current gamma ramps for a display
+ * 
+ * @param   display         The ID of the display
+ * @param   gamma_size      The number of stops you have allocated for the gamma ramps
+ * @param   red             Table allocated for the gamma ramp for the red channel
+ * @param   green           Table allocated for the gamma ramp for the green channel
+ * @param   blue            Table allocated for the gamma ramp for the blue channel
+ * @param   gamma_size_out  Output parameter for the actual number of stops in the gamma ramps
+ * @return                  `kCGErrorSuccess` on success, and error number of failure
+ */
+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;
+
+	/* This is a sloppy compatibility layer that assumes the gamma ramp size is 256 */
+	if (gamma_size != 256) {
+		fprintf(stderr, "Gamma size should be 256\n");
+		abort();
+	}
+
+	/* The gamma ramp size should be returned to the caller */
+	*gamma_size_out = 256;
+
+	/* Read current gamma ramps */
+	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;
+	}
+
+	/* Get gamma ramp values */
+	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);
+
+	/* Translate gamma ramps to float format, that is what CoreGraphics uses */
+	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;
+}
+
+
+/**
+ * Restore each display's gamma ramps to the settings in ColorSync
+ */
+void
+CGDisplayRestoreColorSyncSettings(void)
+{
+	xcb_generic_error_t *error;
+	xcb_void_cookie_t gamma_cookie;
+	uint32_t i;
+
+	/* Restore the gamma ramps on each monitor to
+	 * the ramps that we used when we started */
+	for (i = 0; i < crtc_count; i++) {
+		/* We assume that our gamma ramps are of the size
+		 * 256 (this is a sloppy compatibility layer) */
+		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);
+	}
+}
+
+
+/**
+ * Get the number of stops in the gamma ramps for a display
+ * 
+ * @param   display  The ID of the display
+ * @return           The number of stops in the gamma ramps
+ */
+uint32_t
+CGDisplayGammaTableCapacity(CGDirectDisplayID display)
+{
+	/* We assume that our gamma ramps are of the size
+	 * 256 (this is a sloppy compatibility layer) */
+	(void) display;
+	return 256;
+}
+
+
+#ifdef __GNUC__
+# pragma GCC diagnostic pop
+#endif
+
+
+/**
+ * Release resources used by the backend
+ */
+void close_fake_quartz_cg(void)
+{
+	free(res_reply);
+	res_reply = NULL;
+	if (connection) {
+		xcb_disconnect(connection);
+		connection = NULL;
+	}
+	free(original_ramps);
+	original_ramps = NULL;
+}
+
+#endif