This is an automated email from the git hooks/post-receive script. x2go pushed a commit to branch 3.6.x-rpm-debug in repository nx-libs. commit af8db91d356b20147f7e6c120a038949077b2357 Author: Mihai Moldovan <ionic@ionic.de> Date: Mon Mar 19 00:38:59 2018 +0100 nx-X11/programs/Xserver/hw/nxagent/Screen.c: implement split algorithm/functions. --- nx-X11/programs/Xserver/hw/nxagent/Screen.c | 215 ++++++++++++++++++++++++++++ 1 file changed, 215 insertions(+) diff --git a/nx-X11/programs/Xserver/hw/nxagent/Screen.c b/nx-X11/programs/Xserver/hw/nxagent/Screen.c index d112626..096a028 100644 --- a/nx-X11/programs/Xserver/hw/nxagent/Screen.c +++ b/nx-X11/programs/Xserver/hw/nxagent/Screen.c @@ -3920,6 +3920,221 @@ int nxagentChangeScreenConfig(int screen, int width, int height, int mmWidth, in } /* + * Structure containing a list of splits. + * + * Only used locally, not exported. + */ +typedef struct { + size_t x_count; + size_t y_count; + INT32 *x_splits; + INT32 *y_splits; +} nxagentScreenSplits; + +/* + * Helper function that takes a potential split point, the window bounds, + * a split count and a splits array. + * + * The function checks if the split point is within bounds, not already + * contained in the list and adds a new split point, modifying both the + * count parameter and the splits list. + * + * In case of errors, does nothing. + */ +static void nxagentAddToSplits(const CARD16 test_edge, const CARD16 rwin_start, const CARD16 rwin_end, size_t *split_count, INT32 *splits) { + if ((!(split_count)) || (!(splits))) { + return; + } + + /* FIXME: think through and check edge case: 1px split. */ + if ((rwin_start < test_edge) && (rwin_end > test_edge)) { + /* Edge somewhere inside of agent window, split point. */ + + /* Filter out if split point exists already. */ + Bool exists = FALSE; + for (size_t i = 0; i < (*split_count); ++i) { + if (splits[i] == test_edge) { + exists = TRUE; + break; + } + } + + if (!(exists)) { + splits[(*split_count)++] = test_edge; + } + } +} + +/* Helper function used while sorting the split lists. */ +static int nxagentCompareSplits(const void *lhs, const void *rhs) { + int ret = 0; + + const INT32 lhs_ = *((INT32*)(lhs)), + rhs_ = *((INT32*)(rhs)); + + if (lhs_ < rhs_) { + ret = -1; + } + else if (lhs_ > rhs_) { + ret = 1; + } + + return(ret); +} + +/* Helper function that deallocates a split list. */ +static void nxagentFreeSplits(nxagentScreenSplits **splits) { + if ((!(splits)) || (!(*splits))) { + return; + } + + nxagentScreenSplits *splits_ = (*splits); + + splits_->x_count = 0; + splits_->y_count = 0; + + SAFE_FREE(splits_->x_splits); + SAFE_FREE(splits_->y_splits); + SAFE_FREE(splits_); +} + +/* + * Helper function compacting an nxagentScreenSplits structure. + * The initial allocation assumes the worst case and overallocates memory, + * upper bounded by the maximum count of possible splits for a given screen + * configuration. + * This function compacts the lists back down into what is necessary only. + * + * In case of memory allocation errors, it frees all allocated datan and sets + * the splits list pointer to NULL! + */ +static void nxagentCompactSplits(nxagentScreenSplits **splits, const size_t actual_x_count, const size_t actual_y_count) { + if ((!(splits)) || (!(*splits))) { + return; + } + + nxagentScreenSplits *splits_ = (*splits); + + splits_->x_count = actual_x_count; + INT32 *new_data = NULL; + if (actual_x_count) { + /* Compact to accomodate actual data. */ + new_data = realloc(splits_->x_splits, sizeof(INT32) * actual_x_count); + + if (!(new_data)) { + nxagentFreeSplits(splits); + + return; + } + + splits_->x_splits = new_data; + } + else { + /* No splits in this dimension, drop data. */ + SAFE_FREE(splits_->x_splits); + } + + splits_->y_count = actual_y_count; + if (actual_y_count) { + new_data = realloc(splits_->y_splits, sizeof(INT32) * actual_y_count); + + if (!(new_data)) { + nxagentFreeSplits(splits); + + return; + } + + splits_->y_splits = new_data; + } + else { + /* No splits in this dimension, drop data. */ + SAFE_FREE(splits_->y_splits); + } +} + +/* + * Generate a list of splits. + * This is based upon the client's system configuration and will + * generally create more splits than we need/want. + * + * In case of errors, returns NULL. + */ +static nxagentScreenSplits* nxagentGenerateScreenSplitList(const XineramaScreenInfo *screen_info, const size_t screen_count) { + nxagentScreenSplits *ret = NULL; + + if (!(screen_info)) { + return(ret); + } + + /* + * The maximum number of split points per axis + * is screen_count * 2 due to the rectangular nature of a screen + * (and hence two vertical or horizontal edges). + */ + size_t split_counts = (screen_count * 2); + + ret = calloc(1, sizeof(nxagentScreenSplits)); + if (!ret) { + return(ret); + } + + ret->x_splits = calloc(split_counts, sizeof(INT32)); + ret->y_splits = calloc(split_counts, sizeof(INT32)); + if ((!(ret->x_splits)) || (!(ret->y_splits))) { + SAFE_FREE(ret->x_splits); + SAFE_FREE(ret); + + return(ret); + } + + /* + * Initialize split arrays to -1, denoting no split. + * Could be done only for the first invalid element, but play it safe. + */ + for (size_t i = 0; i < split_counts; ++i) { + ret->x_splits[i] = ret->y_splits[i] = -1; + } + + const CARD16 sess_x_start = nxagentOption(X), + sess_y_start = nxagentOption(Y), + sess_x_end = (sess_x_start + nxagentOption(Width)), + sess_y_end = (sess_y_start + nxagentOption(Height)); + + size_t actual_x_splits = 0, + actual_y_splits = 0; + + for (size_t i = 0; i < screen_count; ++i) { + /* Handle x component. */ + size_t start_x = screen_info[i].x_org, + end_x = start_x + screen_info[i].width; + + /* Left edge. */ + nxagentAddToSplits(start_x, sess_x_start, sess_x_end, &actual_x_splits, ret->x_splits); + + /* Right edge. */ + nxagentAddToSplits(end_x, sess_x_start, sess_x_end, &actual_x_splits, ret->x_splits); + + /* Handle y component. */ + size_t start_y = screen_info[i].y_org, + end_y = start_y + screen_info[i].height; + + /* Top edge. */ + nxagentAddToSplits(start_y, sess_y_start, sess_y_end, &actual_y_splits, ret->y_splits); + + /* Bottom edge. */ + nxagentAddToSplits(end_y, sess_y_start, sess_y_end, &actual_y_splits, ret->y_splits); + } + + /* + * Fetched all split points. + * Compact data and handle errors. + */ + nxagentCompactSplits(&ret, actual_x_splits, actual_y_splits); + + return(ret); +} + +/* Destroy an output after removing it from any crtc that might reference it */ void nxagentDropOutput(RROutputPtr o) { -- Alioth's /home/x2go-admin/maintenancescripts/git/hooks/post-receive-email on /srv/git/code.x2go.org/nx-libs.git