Adding upstream version 2.10.36.upstream/2.10.36

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

1 files changed, 647 insertions, 0 deletions

diff --git a/app/core/gimpscanconvert.c b/app/core/gimpscanconvert.c
new file mode 100644
index 0000000..ed5859c
--- /dev/null
+++ b/app/core/gimpscanconvert.c
@@ -0,0 +1,647 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1999 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 <string.h>
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include <cairo.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "core-types.h"
+
+#include "gimpboundary.h"
+#include "gimpbezierdesc.h"
+#include "gimpscanconvert.h"
+
+
+struct _GimpScanConvert
+{
+  gdouble         ratio_xy;
+
+  gboolean        clip;
+  gint            clip_x;
+  gint            clip_y;
+  gint            clip_w;
+  gint            clip_h;
+
+  /* stroking options */
+  gboolean        do_stroke;
+  gdouble         width;
+  GimpJoinStyle   join;
+  GimpCapStyle    cap;
+  gdouble         miter;
+  gdouble         dash_offset;
+  GArray         *dash_info;
+
+  GArray         *path_data;
+};
+
+
+/*  public functions  */
+
+/**
+ * gimp_scan_convert_new:
+ *
+ * Create a new scan conversion context.
+ *
+ * Return value: a newly allocated #GimpScanConvert context.
+ */
+GimpScanConvert *
+gimp_scan_convert_new (void)
+{
+  GimpScanConvert *sc = g_slice_new0 (GimpScanConvert);
+
+  sc->path_data = g_array_new (FALSE, FALSE, sizeof (cairo_path_data_t));
+  sc->ratio_xy = 1.0;
+
+  return sc;
+}
+
+GimpScanConvert *
+gimp_scan_convert_new_from_boundary (const GimpBoundSeg *bound_segs,
+                                     gint                n_bound_segs,
+                                     gint                offset_x,
+                                     gint                offset_y)
+{
+  g_return_val_if_fail (bound_segs == NULL || n_bound_segs != 0, NULL);
+
+  if (bound_segs)
+    {
+      GimpBoundSeg *stroke_segs;
+      gint          n_stroke_segs;
+
+      stroke_segs = gimp_boundary_sort (bound_segs, n_bound_segs,
+                                        &n_stroke_segs);
+
+      if (stroke_segs)
+        {
+          GimpBezierDesc *bezier;
+
+          bezier = gimp_bezier_desc_new_from_bound_segs (stroke_segs,
+                                                         n_bound_segs,
+                                                         n_stroke_segs);
+
+          g_free (stroke_segs);
+
+          if (bezier)
+            {
+              GimpScanConvert *scan_convert;
+
+              scan_convert = gimp_scan_convert_new ();
+
+              gimp_bezier_desc_translate (bezier, offset_x, offset_y);
+              gimp_scan_convert_add_bezier (scan_convert, bezier);
+
+              gimp_bezier_desc_free (bezier);
+
+              return scan_convert;
+            }
+        }
+    }
+
+  return NULL;
+}
+
+/**
+ * gimp_scan_convert_free:
+ * @sc: a #GimpScanConvert context
+ *
+ * Frees the resources allocated for @sc.
+ */
+void
+gimp_scan_convert_free (GimpScanConvert *sc)
+{
+  g_return_if_fail (sc != NULL);
+
+  if (sc->path_data)
+    g_array_free (sc->path_data, TRUE);
+
+  if (sc->dash_info)
+    g_array_free (sc->dash_info, TRUE);
+
+  g_slice_free (GimpScanConvert, sc);
+}
+
+/**
+ * gimp_scan_convert_set_pixel_ratio:
+ * @sc:       a #GimpScanConvert context
+ * @ratio_xy: the aspect ratio of the major coordinate axes
+ *
+ * Sets the pixel aspect ratio.
+ */
+void
+gimp_scan_convert_set_pixel_ratio (GimpScanConvert *sc,
+                                   gdouble          ratio_xy)
+{
+  g_return_if_fail (sc != NULL);
+
+  /* we only need the relative resolution */
+  sc->ratio_xy = ratio_xy;
+}
+
+/**
+ * gimp_scan_convert_set_clip_rectangle
+ * @sc:     a #GimpScanConvert context
+ * @x:      horizontal offset of clip rectangle
+ * @y:      vertical offset of clip rectangle
+ * @width:  width of clip rectangle
+ * @height: height of clip rectangle
+ *
+ * Sets a clip rectangle on @sc. Subsequent render operations will be
+ * restricted to this area.
+ */
+void
+gimp_scan_convert_set_clip_rectangle (GimpScanConvert *sc,
+                                      gint             x,
+                                      gint             y,
+                                      gint             width,
+                                      gint             height)
+{
+  g_return_if_fail (sc != NULL);
+
+  sc->clip   = TRUE;
+  sc->clip_x = x;
+  sc->clip_y = y;
+  sc->clip_w = width;
+  sc->clip_h = height;
+}
+
+/**
+ * gimp_scan_convert_add_polyline:
+ * @sc:       a #GimpScanConvert context
+ * @n_points: number of points to add
+ * @points:   array of points to add
+ * @closed:   whether to close the polyline and make it a polygon
+ *
+ * Add a polyline with @n_points @points that may be open or closed.
+ *
+ * Please note that you should use gimp_scan_convert_stroke() if you
+ * specify open polygons.
+ */
+void
+gimp_scan_convert_add_polyline (GimpScanConvert   *sc,
+                                guint              n_points,
+                                const GimpVector2 *points,
+                                gboolean           closed)
+{
+  GimpVector2        prev = { 0.0, 0.0, };
+  cairo_path_data_t  pd;
+  gint               i;
+
+  g_return_if_fail (sc != NULL);
+  g_return_if_fail (points != NULL);
+  g_return_if_fail (n_points > 0);
+
+  for (i = 0; i < n_points; i++)
+    {
+      /* compress multiple identical coordinates */
+      if (i == 0 ||
+          prev.x != points[i].x ||
+          prev.y != points[i].y)
+        {
+          pd.header.type = (i == 0) ? CAIRO_PATH_MOVE_TO : CAIRO_PATH_LINE_TO;
+          pd.header.length = 2;
+          sc->path_data = g_array_append_val (sc->path_data, pd);
+
+          pd.point.x = points[i].x;
+          pd.point.y = points[i].y;
+          sc->path_data = g_array_append_val (sc->path_data, pd);
+          prev = points[i];
+        }
+    }
+
+  /* close the polyline when needed */
+  if (closed)
+    {
+      pd.header.type = CAIRO_PATH_CLOSE_PATH;
+      pd.header.length = 1;
+      sc->path_data = g_array_append_val (sc->path_data, pd);
+    }
+}
+
+/**
+ * gimp_scan_convert_add_polyline:
+ * @sc:     a #GimpScanConvert context
+ * @bezier: a #GimpBezierDesc
+ *
+ * Adds a @bezier path to @sc.
+ *
+ * Please note that you should use gimp_scan_convert_stroke() if you
+ * specify open paths.
+ **/
+void
+gimp_scan_convert_add_bezier (GimpScanConvert       *sc,
+                              const GimpBezierDesc  *bezier)
+{
+  g_return_if_fail (sc != NULL);
+  g_return_if_fail (bezier != NULL);
+
+  sc->path_data = g_array_append_vals (sc->path_data,
+                                       bezier->data, bezier->num_data);
+}
+
+/**
+ * gimp_scan_convert_stroke:
+ * @sc:          a #GimpScanConvert context
+ * @width:       line width in pixels
+ * @join:        how lines should be joined
+ * @cap:         how to render the end of lines
+ * @miter:       convert a mitered join to a bevelled join if the miter would
+ *               extend to a distance of more than @miter times @width from
+ *               the actual join point
+ * @dash_offset: offset to apply on the dash pattern
+ * @dash_info:   dash pattern or %NULL for a solid line
+ *
+ * Stroke the content of a GimpScanConvert. The next
+ * gimp_scan_convert_render() will result in the outline of the
+ * polygon defined with the commands above.
+ *
+ * You cannot add additional polygons after this command.
+ *
+ * Note that if you have nonstandard resolution, "width" gives the
+ * width (in pixels) for a vertical stroke, i.e. use the X resolution
+ * to calculate the width of a stroke when operating with real world
+ * units.
+ */
+void
+gimp_scan_convert_stroke (GimpScanConvert *sc,
+                          gdouble          width,
+                          GimpJoinStyle    join,
+                          GimpCapStyle     cap,
+                          gdouble          miter,
+                          gdouble          dash_offset,
+                          GArray          *dash_info)
+{
+  sc->do_stroke = TRUE;
+  sc->width     = width;
+  sc->join      = join;
+  sc->cap       = cap;
+  sc->miter     = miter;
+
+  if (sc->dash_info)
+    {
+      g_array_free (sc->dash_info, TRUE);
+      sc->dash_info = NULL;
+    }
+
+  if (dash_info && dash_info->len >= 2)
+    {
+      gint          n_dashes;
+      gdouble      *dashes;
+      gint          i;
+
+      dash_offset = dash_offset * MAX (width, 1.0);
+
+      n_dashes = dash_info->len;
+      dashes = g_new (gdouble, dash_info->len);
+
+      for (i = 0; i < dash_info->len ; i++)
+        dashes[i] = MAX (width, 1.0) * g_array_index (dash_info, gdouble, i);
+
+      /* correct 0.0 in the first element (starts with a gap) */
+
+      if (dashes[0] == 0.0)
+        {
+          gdouble first;
+
+          first = dashes[1];
+
+          /* shift the pattern to really starts with a dash and
+           * use the offset to skip into it.
+           */
+          for (i = 0; i < dash_info->len - 2; i++)
+            {
+              dashes[i] = dashes[i+2];
+              dash_offset += dashes[i];
+            }
+
+          if (dash_info->len % 2 == 1)
+            {
+              dashes[dash_info->len - 2] = first;
+              n_dashes --;
+            }
+          else if (dash_info->len > 2)
+           {
+             dashes [dash_info->len - 3] += first;
+             n_dashes -= 2;
+           }
+        }
+
+      /* correct odd number of dash specifiers */
+
+      if (n_dashes % 2 == 1)
+        {
+          gdouble last;
+
+          last = dashes[n_dashes - 1];
+          dashes[0]   += last;
+          dash_offset += last;
+          n_dashes --;
+        }
+
+      if (n_dashes >= 2)
+        {
+          sc->dash_info = g_array_sized_new (FALSE, FALSE,
+                                             sizeof (gdouble), n_dashes);
+          sc->dash_info = g_array_append_vals (sc->dash_info, dashes, n_dashes);
+          sc->dash_offset = dash_offset;
+        }
+
+      g_free (dashes);
+    }
+}
+
+
+/**
+ * gimp_scan_convert_render:
+ * @sc:        a #GimpScanConvert context
+ * @buffer:    the #GeglBuffer to render to
+ * @off_x:     horizontal offset into the @buffer
+ * @off_y:     vertical offset into the @buffer
+ * @antialias: whether to apply antialiasiing
+ *
+ * This is a wrapper around gimp_scan_convert_render_full() that replaces the
+ * content of the @buffer with a rendered form of the path passed in.
+ *
+ * You cannot add additional polygons after this command.
+ */
+void
+gimp_scan_convert_render (GimpScanConvert *sc,
+                          GeglBuffer      *buffer,
+                          gint             off_x,
+                          gint             off_y,
+                          gboolean         antialias)
+{
+  gimp_scan_convert_render_full (sc, buffer, off_x, off_y,
+                                 TRUE, antialias, 1.0);
+}
+
+/**
+ * gimp_scan_convert_render_value:
+ * @sc:     a #GimpScanConvert context
+ * @buffer: the #GeglBuffer to render to
+ * @off_x:  horizontal offset into the @buffer
+ * @off_y:  vertical offset into the @buffer
+ * @value:  value to use for covered pixels
+ *
+ * This is a wrapper around gimp_scan_convert_render_full() that
+ * doesn't do antialiasing but gives control over the value that
+ * should be used for pixels covered by the scan conversion. Uncovered
+ * pixels are set to zero.
+ *
+ * You cannot add additional polygons after this command.
+ */
+void
+gimp_scan_convert_render_value (GimpScanConvert *sc,
+                                GeglBuffer      *buffer,
+                                gint             off_x,
+                                gint             off_y,
+                                gdouble          value)
+{
+  gimp_scan_convert_render_full (sc, buffer, off_x, off_y,
+                                 TRUE, FALSE, value);
+}
+
+/**
+ * gimp_scan_convert_compose:
+ * @sc:     a #GimpScanConvert context
+ * @buffer: the #GeglBuffer to render to
+ * @off_x:  horizontal offset into the @buffer
+ * @off_y:  vertical offset into the @buffer
+ *
+ * This is a wrapper around of gimp_scan_convert_render_full() that composes
+ * the (aliased) scan conversion on top of the content of the @buffer.
+ *
+ * You cannot add additional polygons after this command.
+ */
+void
+gimp_scan_convert_compose (GimpScanConvert *sc,
+                           GeglBuffer      *buffer,
+                           gint             off_x,
+                           gint             off_y)
+{
+  gimp_scan_convert_render_full (sc, buffer, off_x, off_y,
+                                 FALSE, FALSE, 1.0);
+}
+
+/**
+ * gimp_scan_convert_compose_value:
+ * @sc:     a #GimpScanConvert context
+ * @buffer: the #GeglBuffer to render to
+ * @off_x:  horizontal offset into the @buffer
+ * @off_y:  vertical offset into the @buffer
+ * @value:  value to use for covered pixels
+ *
+ * This is a wrapper around gimp_scan_convert_render_full() that
+ * composes the (aliased) scan conversion with value @value on top of the
+ * content of the @buffer.
+ *
+ * You cannot add additional polygons after this command.
+ */
+void
+gimp_scan_convert_compose_value (GimpScanConvert *sc,
+                                 GeglBuffer      *buffer,
+                                 gint             off_x,
+                                 gint             off_y,
+                                 gdouble          value)
+{
+  gimp_scan_convert_render_full (sc, buffer, off_x, off_y,
+                                 FALSE, FALSE, value);
+}
+
+/**
+ * gimp_scan_convert_render_full:
+ * @sc:        a #GimpScanConvert context
+ * @buffer:    the #GeglBuffer to render to
+ * @off_x:     horizontal offset into the @buffer
+ * @off_y:     vertical offset into the @buffer
+ * @replace:   if true the original content of the @buffer gets estroyed
+ * @antialias: if true the rendering happens antialiased
+ * @value:     value to use for covered pixels
+ *
+ * This function renders the area described by the path to the
+ * @buffer, taking the offset @off_x and @off_y in the buffer into
+ * account.  The rendering can happen antialiased and be rendered on
+ * top of existing content or replacing it completely. The @value
+ * specifies the opacity value to be used for the objects in the @sc.
+ *
+ * You cannot add additional polygons after this command.
+ */
+void
+gimp_scan_convert_render_full (GimpScanConvert *sc,
+                               GeglBuffer      *buffer,
+                               gint             off_x,
+                               gint             off_y,
+                               gboolean         replace,
+                               gboolean         antialias,
+                               gdouble          value)
+{
+  const Babl         *format;
+  guchar             *shared_buf      = NULL;
+  gsize               shared_buf_size = 0;
+  GeglBufferIterator *iter;
+  GeglRectangle      *roi;
+  cairo_t            *cr;
+  cairo_surface_t    *surface;
+  cairo_path_t        path;
+  gint                bpp;
+  gint                x, y;
+  gint                width, height;
+
+  g_return_if_fail (sc != NULL);
+  g_return_if_fail (GEGL_IS_BUFFER (buffer));
+
+  x      = gegl_buffer_get_x      (buffer);
+  y      = gegl_buffer_get_y      (buffer);
+  width  = gegl_buffer_get_width  (buffer);
+  height = gegl_buffer_get_height (buffer);
+
+  if (sc->clip && ! gimp_rectangle_intersect (x, y, width, height,
+                                              sc->clip_x, sc->clip_y,
+                                              sc->clip_w, sc->clip_h,
+                                              &x, &y, &width, &height))
+    return;
+
+  path.status   = CAIRO_STATUS_SUCCESS;
+  path.data     = (cairo_path_data_t *) sc->path_data->data;
+  path.num_data = sc->path_data->len;
+
+  format = babl_format ("Y u8");
+  bpp    = babl_format_get_bytes_per_pixel (format);
+
+  iter = gegl_buffer_iterator_new (buffer, NULL, 0, format,
+                                   GEGL_ACCESS_READWRITE, GEGL_ABYSS_NONE, 1);
+  roi = &iter->items[0].roi;
+
+  while (gegl_buffer_iterator_next (iter))
+    {
+      guchar     *data    = iter->items[0].data;
+      guchar     *tmp_buf = NULL;
+      const gint  stride  = cairo_format_stride_for_width (CAIRO_FORMAT_A8,
+                                                           roi->width);
+
+      /*  cairo rowstrides are always multiples of 4, whereas
+       *  maskPR.rowstride can be anything, so to be able to create an
+       *  image surface, we maybe have to create our own temporary
+       *  buffer
+       */
+      if (roi->width * bpp != stride)
+        {
+          if (shared_buf_size < stride * roi->height)
+            {
+              shared_buf_size = stride * roi->height;
+              g_free (shared_buf);
+              shared_buf = g_malloc (shared_buf_size);
+            }
+          tmp_buf = shared_buf;
+
+          if (! replace)
+            {
+              const guchar *src  = data;
+              guchar       *dest = tmp_buf;
+              gint          i;
+
+              for (i = 0; i < roi->height; i++)
+                {
+                  memcpy (dest, src, roi->width * bpp);
+
+                  src  += roi->width * bpp;
+                  dest += stride;
+                }
+            }
+        }
+
+      surface = cairo_image_surface_create_for_data (tmp_buf ?
+                                                     tmp_buf : data,
+                                                     CAIRO_FORMAT_A8,
+                                                     roi->width, roi->height,
+                                                     stride);
+
+      cairo_surface_set_device_offset (surface,
+                                       -off_x - roi->x,
+                                       -off_y - roi->y);
+      cr = cairo_create (surface);
+      cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+
+      if (replace)
+        {
+          cairo_set_source_rgba (cr, 0, 0, 0, 0);
+          cairo_paint (cr);
+        }
+
+      cairo_set_source_rgba (cr, 0, 0, 0, value);
+      cairo_append_path (cr, &path);
+
+      cairo_set_antialias (cr, antialias ?
+                           CAIRO_ANTIALIAS_GRAY : CAIRO_ANTIALIAS_NONE);
+      cairo_set_miter_limit (cr, sc->miter);
+
+      if (sc->do_stroke)
+        {
+          cairo_set_line_cap (cr,
+                              sc->cap == GIMP_CAP_BUTT ? CAIRO_LINE_CAP_BUTT :
+                              sc->cap == GIMP_CAP_ROUND ? CAIRO_LINE_CAP_ROUND :
+                              CAIRO_LINE_CAP_SQUARE);
+          cairo_set_line_join (cr,
+                               sc->join == GIMP_JOIN_MITER ? CAIRO_LINE_JOIN_MITER :
+                               sc->join == GIMP_JOIN_ROUND ? CAIRO_LINE_JOIN_ROUND :
+                               CAIRO_LINE_JOIN_BEVEL);
+
+          cairo_set_line_width (cr, sc->width);
+
+          if (sc->dash_info)
+            cairo_set_dash (cr,
+                            (double *) sc->dash_info->data,
+                            sc->dash_info->len,
+                            sc->dash_offset);
+
+          cairo_scale (cr, 1.0, sc->ratio_xy);
+          cairo_stroke (cr);
+        }
+      else
+        {
+          cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+          cairo_fill (cr);
+        }
+
+      cairo_destroy (cr);
+      cairo_surface_destroy (surface);
+
+      if (tmp_buf)
+        {
+          const guchar *src  = tmp_buf;
+          guchar       *dest = data;
+          gint          i;
+
+          for (i = 0; i < roi->height; i++)
+            {
+              memcpy (dest, src, roi->width * bpp);
+
+              src  += stride;
+              dest += roi->width * bpp;
+            }
+        }
+    }
+
+  g_free (shared_buf);
+}