Adding upstream version 2.10.36.upstream/2.10.36

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 334 insertions, 0 deletions

diff --git a/libgimp/gimppixelfetcher.c b/libgimp/gimppixelfetcher.c
new file mode 100644
index 0000000..c71fdca
--- /dev/null
+++ b/libgimp/gimppixelfetcher.c
@@ -0,0 +1,334 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimppixelfetcher.c
+ *
+ * This library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#define GIMP_DISABLE_DEPRECATION_WARNINGS
+
+#include "gimp.h"
+
+
+/**
+ * SECTION: gimppixelfetcher
+ * @title: gimppixelfetcher
+ * @short_description: Functions for operating on pixel regions.
+ *
+ * These functions provide neighbourhood-based algorithms which get
+ * dramatically slower on region boundaries, to the point where a
+ * special treatment for neighbourhoods which are completely inside a
+ * tile is called for. It hides the special treatment of tile borders,
+ * making plug-in code more readable and shorter.
+ **/
+
+
+struct _GimpPixelFetcher
+{
+  gint                      col, row;
+  gint                      img_width;
+  gint                      img_height;
+  gint                      sel_x1, sel_y1, sel_x2, sel_y2;
+  gint                      img_bpp;
+  gint                      tile_width, tile_height;
+  guchar                    bg_color[4];
+  GimpPixelFetcherEdgeMode  mode;
+  GimpDrawable             *drawable;
+  GimpTile                 *tile;
+  gboolean                  tile_dirty;
+  gboolean                  shadow;
+};
+
+
+/*  local function prototypes  */
+
+static guchar * gimp_pixel_fetcher_provide_tile (GimpPixelFetcher *pf,
+                                                 gint              x,
+                                                 gint              y);
+
+
+/*  public functions  */
+
+/**
+ * gimp_pixel_fetcher_new:
+ * @drawable: the #GimpDrawable the new region will be attached to.
+ * @shadow:   a #gboolean indicating whether the region is attached to
+ *            the shadow tiles or the real @drawable tiles.
+ *
+ * Initialize a pixel region from the drawable.
+ *
+ * Return value: a pointer to a #GimpPixelRgn structure (or NULL).
+ **/
+GimpPixelFetcher *
+gimp_pixel_fetcher_new (GimpDrawable *drawable,
+                        gboolean      shadow)
+{
+  GimpPixelFetcher *pf;
+  gint              width;
+  gint              height;
+  gint              bpp;
+
+  g_return_val_if_fail (drawable != NULL, NULL);
+
+  width  = gimp_drawable_width  (drawable->drawable_id);
+  height = gimp_drawable_height (drawable->drawable_id);
+  bpp    = gimp_drawable_bpp    (drawable->drawable_id);
+
+  g_return_val_if_fail (width > 0 && height > 0 && bpp > 0, NULL);
+
+  pf = g_slice_new0 (GimpPixelFetcher);
+
+  gimp_drawable_mask_bounds (drawable->drawable_id,
+                             &pf->sel_x1, &pf->sel_y1,
+                             &pf->sel_x2, &pf->sel_y2);
+
+  pf->col           = -1;
+  pf->row           = -1;
+  pf->img_width     = width;
+  pf->img_height    = height;
+  pf->img_bpp       = bpp;
+  pf->tile_width    = gimp_tile_width ();
+  pf->tile_height   = gimp_tile_height ();
+  pf->bg_color[0]   = 0;
+  pf->bg_color[1]   = 0;
+  pf->bg_color[2]   = 0;
+  pf->bg_color[3]   = 255;
+  pf->mode          = GIMP_PIXEL_FETCHER_EDGE_NONE;
+  pf->drawable      = drawable;
+  pf->tile          = NULL;
+  pf->tile_dirty    = FALSE;
+  pf->shadow        = shadow;
+
+  return pf;
+}
+
+/**
+ * gimp_pixel_fetcher_destroy:
+ * @pf: a pointer to a previously initialized #GimpPixelFetcher.
+ *
+ * Close a previously initialized pixel region.
+ **/
+void
+gimp_pixel_fetcher_destroy (GimpPixelFetcher *pf)
+{
+  g_return_if_fail (pf != NULL);
+
+  if (pf->tile)
+    gimp_tile_unref (pf->tile, pf->tile_dirty);
+
+  g_slice_free (GimpPixelFetcher, pf);
+}
+
+/**
+ * gimp_pixel_fetcher_set_edge_mode:
+ * @pf:   a pointer to a previously initialized #GimpPixelFetcher.
+ * @mode: the new edge mode from #GimpPixelFetcherEdgeMode.
+ *
+ * Change the edge mode of a previously initialized pixel region.
+ **/
+void
+gimp_pixel_fetcher_set_edge_mode (GimpPixelFetcher         *pf,
+                                  GimpPixelFetcherEdgeMode  mode)
+{
+  g_return_if_fail (pf != NULL);
+
+  pf->mode = mode;
+}
+
+/**
+ * gimp_pixel_fetcher_set_bg_color:
+ * @pf:    a pointer to a previously initialized #GimpPixelFetcher.
+ * @color: the color to be used as bg color.
+ *
+ * Change the background color of a previously initialized pixel region.
+ **/
+void
+gimp_pixel_fetcher_set_bg_color (GimpPixelFetcher *pf,
+                                 const GimpRGB    *color)
+{
+  g_return_if_fail (pf != NULL);
+  g_return_if_fail (color != NULL);
+
+  switch (pf->img_bpp)
+    {
+    case 2: pf->bg_color[1] = 255;
+    case 1:
+      pf->bg_color[0] = gimp_rgb_luminance_uchar (color);
+      break;
+
+    case 4: pf->bg_color[3] = 255;
+    case 3:
+      gimp_rgb_get_uchar (color,
+                          pf->bg_color, pf->bg_color + 1, pf->bg_color + 2);
+      break;
+    }
+}
+
+/**
+ * gimp_pixel_fetcher_get_pixel:
+ * @pf:    a pointer to a previously initialized #GimpPixelFetcher.
+ * @x:     the x coordinate of the pixel to get.
+ * @y:     the y coordinate of the pixel to get.
+ * @pixel: the memory location where to return the pixel.
+ *
+ * Get a pixel from the pixel region.
+ **/
+void
+gimp_pixel_fetcher_get_pixel (GimpPixelFetcher *pf,
+                              gint              x,
+                              gint              y,
+                              guchar           *pixel)
+{
+  guchar *p;
+  gint    i;
+
+  g_return_if_fail (pf != NULL);
+  g_return_if_fail (pixel != NULL);
+
+  if (pf->mode == GIMP_PIXEL_FETCHER_EDGE_NONE &&
+      (x < pf->sel_x1 || x >= pf->sel_x2 ||
+       y < pf->sel_y1 || y >= pf->sel_y2))
+    {
+      return;
+    }
+
+  if (x < 0 || x >= pf->img_width ||
+      y < 0 || y >= pf->img_height)
+    {
+      switch (pf->mode)
+        {
+        case GIMP_PIXEL_FETCHER_EDGE_WRAP:
+          if (x < 0 || x >= pf->img_width)
+            {
+              x %= pf->img_width;
+
+              if (x < 0)
+                x += pf->img_width;
+            }
+
+          if (y < 0 || y >= pf->img_height)
+            {
+              y %= pf->img_height;
+
+              if (y < 0)
+                y += pf->img_height;
+            }
+          break;
+
+        case GIMP_PIXEL_FETCHER_EDGE_SMEAR:
+          x = CLAMP (x, 0, pf->img_width - 1);
+          y = CLAMP (y, 0, pf->img_height - 1);
+          break;
+
+        case GIMP_PIXEL_FETCHER_EDGE_BLACK:
+          for (i = 0; i < pf->img_bpp; i++)
+            pixel[i] = 0;
+          return;
+
+        case GIMP_PIXEL_FETCHER_EDGE_BACKGROUND:
+          for (i = 0; i < pf->img_bpp; i++)
+            pixel[i] = pf->bg_color[i];
+          return;
+
+        default:
+          return;
+        }
+    }
+
+  p = gimp_pixel_fetcher_provide_tile (pf, x, y);
+
+  i = pf->img_bpp;
+
+  do
+    {
+      *pixel++ = *p++;
+    }
+  while (--i);
+}
+
+/**
+ * gimp_pixel_fetcher_put_pixel:
+ * @pf:    a pointer to a previously initialized #GimpPixelFetcher.
+ * @x:     the x coordinate of the pixel to set.
+ * @y:     the y coordinate of the pixel to set.
+ * @pixel: the pixel to set.
+ *
+ * Set a pixel in the pixel region.
+ **/
+void
+gimp_pixel_fetcher_put_pixel (GimpPixelFetcher *pf,
+                              gint              x,
+                              gint              y,
+                              const guchar     *pixel)
+{
+  guchar *p;
+  gint    i;
+
+  g_return_if_fail (pf != NULL);
+  g_return_if_fail (pixel != NULL);
+
+  if (x < pf->sel_x1 || x >= pf->sel_x2 ||
+      y < pf->sel_y1 || y >= pf->sel_y2)
+    {
+      return;
+    }
+
+  p = gimp_pixel_fetcher_provide_tile (pf, x, y);
+
+  i = pf->img_bpp;
+
+  do
+    {
+      *p++ = *pixel++;
+    }
+  while (--i);
+
+  pf->tile_dirty = TRUE;
+}
+
+
+/*  private functions  */
+
+static guchar *
+gimp_pixel_fetcher_provide_tile (GimpPixelFetcher *pf,
+                                 gint              x,
+                                 gint              y)
+{
+  gint col, row;
+  gint coloff, rowoff;
+
+  col    = x / pf->tile_width;
+  coloff = x % pf->tile_width;
+  row    = y / pf->tile_height;
+  rowoff = y % pf->tile_height;
+
+  if ((col != pf->col) || (row != pf->row) || (pf->tile == NULL))
+    {
+      if (pf->tile != NULL)
+        gimp_tile_unref (pf->tile, pf->tile_dirty);
+
+      pf->tile = gimp_drawable_get_tile (pf->drawable, pf->shadow, row, col);
+      pf->tile_dirty = FALSE;
+      gimp_tile_ref (pf->tile);
+
+      pf->col = col;
+      pf->row = row;
+    }
+
+  return pf->tile->data + pf->img_bpp * (pf->tile->ewidth * rowoff + coloff);
+}