/* See LICENSE file for copyright and license details. */ #define IN_LIBGAMMA_QUARTZ_CG #include "common.h" /* 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. */ #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 #include /** * 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(*original_ramps)); 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 */ memcpy(&original_ramps[(3 * i + 0) * 256], xcb_randr_get_crtc_gamma_red(gamma_reply) 256 * sizeof(*original_ramps)); memcpy(&original_ramps[(3 * i + 1) * 256], xcb_randr_get_crtc_gamma_green(gamma_reply), 256 * sizeof(*original_ramps)); memcpy(&original_ramps[(3 * i + 2) * 256], xcb_randr_get_crtc_gamma_blue(gamma_reply), 256 * sizeof(*original_ramps)); /* 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