diff options
Diffstat (limited to 'src/lib/fake-quartz-cg.c')
| -rw-r--r-- | src/lib/fake-quartz-cg.c | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/src/lib/fake-quartz-cg.c b/src/lib/fake-quartz-cg.c index dbd06c7..1fcfaf3 100644 --- a/src/lib/fake-quartz-cg.c +++ b/src/lib/fake-quartz-cg.c @@ -156,6 +156,7 @@ CGError CGGetOnlineDisplayList(uint32_t max_size, { uint32_t i; + /* Connect to the display and get screen data if not already done so. */ if (connection == NULL) { xcb_generic_error_t* error; @@ -164,12 +165,13 @@ CGError CGGetOnlineDisplayList(uint32_t max_size, xcb_randr_get_crtc_gamma_cookie_t gamma_cookie; xcb_randr_get_crtc_gamma_reply_t* restrict gamma_reply; + /* 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"); @@ -178,9 +180,19 @@ CGError CGGetOnlineDisplayList(uint32_t max_size, 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 == NULL) { @@ -190,11 +202,12 @@ CGError CGGetOnlineDisplayList(uint32_t max_size, 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"); @@ -203,6 +216,7 @@ CGError CGGetOnlineDisplayList(uint32_t max_size, 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)); @@ -211,13 +225,16 @@ CGError CGGetOnlineDisplayList(uint32_t max_size, #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; } @@ -233,26 +250,33 @@ CGError CGSetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_si long i; int32_t v; + /* 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) == NULL ? kCGErrorSuccess : ~kCGErrorSuccess; } @@ -269,27 +293,32 @@ CGError CGGetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_si 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; |