diff options
Diffstat (limited to 'app/display/gimpdisplayxfer.c')
| -rw-r--r-- | app/display/gimpdisplayxfer.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/app/display/gimpdisplayxfer.c b/app/display/gimpdisplayxfer.c new file mode 100644 index 0000000..1dcd13c --- /dev/null +++ b/app/display/gimpdisplayxfer.c @@ -0,0 +1,289 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * This program 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 program 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 program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <stdlib.h> +#include <string.h> + +#include <gegl.h> +#include <gtk/gtk.h> + +#include "display-types.h" + +#include "gimpdisplayxfer.h" + + +#define NUM_PAGES 2 + +typedef struct _RTree RTree; +typedef struct _RTreeNode RTreeNode; + +struct _RTreeNode +{ + RTreeNode *children[2]; + RTreeNode *next; + gint x, y, w, h; +}; + +struct _RTree +{ + RTreeNode root; + RTreeNode *available; +}; + +struct _GimpDisplayXfer +{ + /* track subregions of render_surface for efficient uploads */ + RTree rtree; + cairo_surface_t *render_surface[NUM_PAGES]; + gint page; +}; + + +gint GIMP_DISPLAY_RENDER_BUF_WIDTH = 256; +gint GIMP_DISPLAY_RENDER_BUF_HEIGHT = 256; + + +static RTreeNode * +rtree_node_create (RTree *rtree, + RTreeNode **prev, + gint x, + gint y, + gint w, + gint h) +{ + RTreeNode *node; + + gimp_assert (x >= 0 && x+w <= rtree->root.w); + gimp_assert (y >= 0 && y+h <= rtree->root.h); + + if (w <= 0 || h <= 0) + return NULL; + + node = g_slice_alloc (sizeof (*node)); + + node->children[0] = NULL; + node->children[1] = NULL; + node->x = x; + node->y = y; + node->w = w; + node->h = h; + + node->next = *prev; + *prev = node; + + return node; +} + +static void +rtree_node_destroy (RTree *rtree, + RTreeNode *node) +{ + gint i; + + for (i = 0; i < 2; i++) + { + if (node->children[i]) + rtree_node_destroy (rtree, node->children[i]); + } + + g_slice_free (RTreeNode, node); +} + +static RTreeNode * +rtree_node_insert (RTree *rtree, + RTreeNode **prev, + RTreeNode *node, + gint w, + gint h) +{ + *prev = node->next; + + if (((node->w - w) | (node->h - h)) > 1) + { + gint ww = node->w - w; + gint hh = node->h - h; + + if (ww >= hh) + { + node->children[0] = rtree_node_create (rtree, prev, + node->x + w, node->y, + ww, node->h); + node->children[1] = rtree_node_create (rtree, prev, + node->x, node->y + h, + w, hh); + } + else + { + node->children[0] = rtree_node_create (rtree, prev, + node->x, node->y + h, + node->w, hh); + node->children[1] = rtree_node_create (rtree, prev, + node->x + w, node->y, + ww, h); + } + } + + return node; +} + +static RTreeNode * +rtree_insert (RTree *rtree, + gint w, + gint h) +{ + RTreeNode *node, **prev; + + for (prev = &rtree->available; (node = *prev); prev = &node->next) + if (node->w >= w && node->h >= h) + return rtree_node_insert (rtree, prev, node, w, h); + + return NULL; +} + +static void +rtree_init (RTree *rtree, + gint w, + gint h) +{ + rtree->root.x = 0; + rtree->root.y = 0; + rtree->root.w = w; + rtree->root.h = h; + rtree->root.children[0] = NULL; + rtree->root.children[1] = NULL; + rtree->root.next = NULL; + rtree->available = &rtree->root; +} + +static void +rtree_reset (RTree *rtree) +{ + gint i; + + for (i = 0; i < 2; i++) + { + if (rtree->root.children[i] == NULL) + continue; + + rtree_node_destroy (rtree, rtree->root.children[i]); + rtree->root.children[i] = NULL; + } + + rtree->root.next = NULL; + rtree->available = &rtree->root; +} + +static void +xfer_destroy (void *data) +{ + GimpDisplayXfer *xfer = data; + gint i; + + for (i = 0; i < NUM_PAGES; i++) + cairo_surface_destroy (xfer->render_surface[i]); + + rtree_reset (&xfer->rtree); + g_free (xfer); +} + +GimpDisplayXfer * +gimp_display_xfer_realize (GtkWidget *widget) +{ + GdkScreen *screen; + GimpDisplayXfer *xfer; + const gchar *env; + + env = g_getenv ("GIMP_DISPLAY_RENDER_BUF_SIZE"); + if (env) + { + gint width = atoi (env); + gint height = width; + + env = strchr (env, 'x'); + if (env) + height = atoi (env + 1); + + if (width > 0 && width <= 8192 && + height > 0 && height <= 8192) + { + GIMP_DISPLAY_RENDER_BUF_WIDTH = width; + GIMP_DISPLAY_RENDER_BUF_HEIGHT = height; + } + } + + screen = gtk_widget_get_screen (widget); + xfer = g_object_get_data (G_OBJECT (screen), "gimp-display-xfer"); + + if (xfer == NULL) + { + cairo_t *cr; + gint w = GIMP_DISPLAY_RENDER_BUF_WIDTH; + gint h = GIMP_DISPLAY_RENDER_BUF_HEIGHT; + int n; + + xfer = g_new (GimpDisplayXfer, 1); + rtree_init (&xfer->rtree, w, h); + + cr = gdk_cairo_create (gtk_widget_get_window (widget)); + for (n = 0; n < NUM_PAGES; n++) + { + xfer->render_surface[n] = + cairo_surface_create_similar_image (cairo_get_target (cr), + CAIRO_FORMAT_ARGB32, w, h); + cairo_surface_mark_dirty (xfer->render_surface[n]); + } + cairo_destroy (cr); + xfer->page = 0; + + g_object_set_data_full (G_OBJECT (screen), + "gimp-display-xfer", + xfer, xfer_destroy); + } + + return xfer; +} + +cairo_surface_t * +gimp_display_xfer_get_surface (GimpDisplayXfer *xfer, + gint w, + gint h, + gint *src_x, + gint *src_y) +{ + RTreeNode *node; + + gimp_assert (w <= GIMP_DISPLAY_RENDER_BUF_WIDTH && + h <= GIMP_DISPLAY_RENDER_BUF_HEIGHT); + + node = rtree_insert (&xfer->rtree, w, h); + if (node == NULL) + { + xfer->page = (xfer->page + 1) % NUM_PAGES; + cairo_surface_flush (xfer->render_surface[xfer->page]); + rtree_reset (&xfer->rtree); + cairo_surface_mark_dirty (xfer->render_surface[xfer->page]); /* XXX */ + node = rtree_insert (&xfer->rtree, w, h); + gimp_assert (node != NULL); + } + + *src_x = node->x; + *src_y = node->y; + + return xfer->render_surface[xfer->page]; +} |