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-rw-r--r--app/core/gimpgradient-load.c575
1 files changed, 575 insertions, 0 deletions
diff --git a/app/core/gimpgradient-load.c b/app/core/gimpgradient-load.c
new file mode 100644
index 0000000..1abe494
--- /dev/null
+++ b/app/core/gimpgradient-load.c
@@ -0,0 +1,575 @@
+/* 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 <errno.h>
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpcolor/gimpcolor.h"
+
+#include "core-types.h"
+
+#include "config/gimpxmlparser.h"
+
+#include "gimp-utils.h"
+#include "gimpgradient.h"
+#include "gimpgradient-load.h"
+
+#include "gimp-intl.h"
+
+
+GList *
+gimp_gradient_load (GimpContext *context,
+ GFile *file,
+ GInputStream *input,
+ GError **error)
+{
+ GimpGradient *gradient = NULL;
+ GimpGradientSegment *prev;
+ gint num_segments;
+ gint i;
+ GDataInputStream *data_input;
+ gchar *line;
+ gsize line_len;
+ gint linenum;
+
+ g_return_val_if_fail (G_IS_FILE (file), NULL);
+ g_return_val_if_fail (G_IS_INPUT_STREAM (input), NULL);
+ g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+ data_input = g_data_input_stream_new (input);
+
+ linenum = 1;
+ line_len = 1024;
+ line = gimp_data_input_stream_read_line_always (data_input, &line_len,
+ NULL, error);
+ if (! line)
+ goto failed;
+
+ if (! g_str_has_prefix (line, "GIMP Gradient"))
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Not a GIMP gradient file."));
+ g_free (line);
+ goto failed;
+ }
+
+ g_free (line);
+
+ gradient = g_object_new (GIMP_TYPE_GRADIENT,
+ "mime-type", "application/x-gimp-gradient",
+ NULL);
+
+ linenum++;
+ line_len = 1024;
+ line = gimp_data_input_stream_read_line_always (data_input, &line_len,
+ NULL, error);
+ if (! line)
+ goto failed;
+
+ if (g_str_has_prefix (line, "Name: "))
+ {
+ gchar *utf8;
+
+ utf8 = gimp_any_to_utf8 (g_strstrip (line + strlen ("Name: ")), -1,
+ _("Invalid UTF-8 string in gradient file '%s'."),
+ gimp_file_get_utf8_name (file));
+ gimp_object_take_name (GIMP_OBJECT (gradient), utf8);
+
+ g_free (line);
+
+ linenum++;
+ line_len = 1024;
+ line = gimp_data_input_stream_read_line_always (data_input, &line_len,
+ NULL, error);
+ if (! line)
+ goto failed;
+ }
+ else /* old gradient format */
+ {
+ gimp_object_take_name (GIMP_OBJECT (gradient),
+ g_path_get_basename (gimp_file_get_utf8_name (file)));
+ }
+
+ num_segments = atoi (line);
+
+ g_free (line);
+
+ if (num_segments < 1)
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("File is corrupt."));
+ goto failed;
+ }
+
+ prev = NULL;
+
+ for (i = 0; i < num_segments; i++)
+ {
+ GimpGradientSegment *seg;
+ gchar *end;
+ gint color;
+ gint type;
+ gint left_color_type;
+ gint right_color_type;
+
+ seg = gimp_gradient_segment_new ();
+
+ seg->prev = prev;
+
+ if (prev)
+ prev->next = seg;
+ else
+ gradient->segments = seg;
+
+ linenum++;
+ line_len = 1024;
+ line = gimp_data_input_stream_read_line_always (data_input, &line_len,
+ NULL, error);
+ if (! line)
+ goto failed;
+
+ if (! gimp_ascii_strtod (line, &end, &seg->left) ||
+ ! gimp_ascii_strtod (end, &end, &seg->middle) ||
+ ! gimp_ascii_strtod (end, &end, &seg->right) ||
+
+ ! gimp_ascii_strtod (end, &end, &seg->left_color.r) ||
+ ! gimp_ascii_strtod (end, &end, &seg->left_color.g) ||
+ ! gimp_ascii_strtod (end, &end, &seg->left_color.b) ||
+ ! gimp_ascii_strtod (end, &end, &seg->left_color.a) ||
+
+ ! gimp_ascii_strtod (end, &end, &seg->right_color.r) ||
+ ! gimp_ascii_strtod (end, &end, &seg->right_color.g) ||
+ ! gimp_ascii_strtod (end, &end, &seg->right_color.b) ||
+ ! gimp_ascii_strtod (end, &end, &seg->right_color.a))
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Corrupt segment %d."), i);
+ g_free (line);
+ goto failed;
+ }
+
+ switch (sscanf (end, "%d %d %d %d",
+ &type, &color,
+ &left_color_type, &right_color_type))
+ {
+ case 4:
+ seg->left_color_type = (GimpGradientColor) left_color_type;
+ if (seg->left_color_type < GIMP_GRADIENT_COLOR_FIXED ||
+ seg->left_color_type > GIMP_GRADIENT_COLOR_BACKGROUND_TRANSPARENT)
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Corrupt segment %d."), i);
+ g_free (line);
+ goto failed;
+ }
+
+ seg->right_color_type = (GimpGradientColor) right_color_type;
+ if (seg->right_color_type < GIMP_GRADIENT_COLOR_FIXED ||
+ seg->right_color_type > GIMP_GRADIENT_COLOR_BACKGROUND_TRANSPARENT)
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Corrupt segment %d."), i);
+ g_free (line);
+ goto failed;
+ }
+ /* fall thru */
+
+ case 2:
+ seg->type = (GimpGradientSegmentType) type;
+ if (seg->type < GIMP_GRADIENT_SEGMENT_LINEAR ||
+ seg->type > GIMP_GRADIENT_SEGMENT_STEP)
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Corrupt segment %d."), i);
+ g_free (line);
+ goto failed;
+ }
+
+ seg->color = (GimpGradientSegmentColor) color;
+ if (seg->color < GIMP_GRADIENT_SEGMENT_RGB ||
+ seg->color > GIMP_GRADIENT_SEGMENT_HSV_CW)
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Corrupt segment %d."), i);
+ g_free (line);
+ goto failed;
+ }
+ break;
+
+ default:
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Corrupt segment %d."), i);
+ g_free (line);
+ goto failed;
+ }
+
+ g_free (line);
+
+ if (seg->left > seg->middle ||
+ seg->middle > seg->right ||
+ ( prev && (prev->right != seg->left)) ||
+ (! prev && (0.0 != seg->left)))
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Segments do not span the range 0-1."));
+ goto failed;
+ }
+
+ prev = seg;
+ }
+
+ if (prev->right != 1.0)
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("Segments do not span the range 0-1."));
+ goto failed;
+ }
+
+ g_object_unref (data_input);
+
+ return g_list_prepend (NULL, gradient);
+
+ failed:
+
+ g_object_unref (data_input);
+
+ if (gradient)
+ g_object_unref (gradient);
+
+ g_prefix_error (error, _("In line %d of gradient file: "), linenum);
+
+ return NULL;
+}
+
+
+/* SVG gradient parser */
+
+typedef struct
+{
+ GimpGradient *gradient; /* current gradient */
+ GList *gradients; /* finished gradients */
+ GList *stops;
+} SvgParser;
+
+typedef struct
+{
+ gdouble offset;
+ GimpRGB color;
+} SvgStop;
+
+
+static void svg_parser_start_element (GMarkupParseContext *context,
+ const gchar *element_name,
+ const gchar **attribute_names,
+ const gchar **attribute_values,
+ gpointer user_data,
+ GError **error);
+static void svg_parser_end_element (GMarkupParseContext *context,
+ const gchar *element_name,
+ gpointer user_data,
+ GError **error);
+
+static GimpGradientSegment *
+ svg_parser_gradient_segments (GList *stops);
+
+static SvgStop * svg_parse_gradient_stop (const gchar **names,
+ const gchar **values);
+
+
+static const GMarkupParser markup_parser =
+{
+ svg_parser_start_element,
+ svg_parser_end_element,
+ NULL, /* characters */
+ NULL, /* passthrough */
+ NULL /* error */
+};
+
+
+GList *
+gimp_gradient_load_svg (GimpContext *context,
+ GFile *file,
+ GInputStream *input,
+ GError **error)
+{
+ GimpXmlParser *xml_parser;
+ SvgParser parser = { NULL, };
+ gboolean success;
+
+ g_return_val_if_fail (G_IS_FILE (file), NULL);
+ g_return_val_if_fail (G_IS_INPUT_STREAM (input), NULL);
+ g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+ /* FIXME input */
+ g_input_stream_close (input, NULL, NULL);
+
+ xml_parser = gimp_xml_parser_new (&markup_parser, &parser);
+
+ success = gimp_xml_parser_parse_gfile (xml_parser, file, error);
+
+ gimp_xml_parser_free (xml_parser);
+
+ if (success && ! parser.gradients)
+ {
+ g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+ _("No linear gradients found."));
+ }
+
+ if (parser.gradient)
+ g_object_unref (parser.gradient);
+
+ if (parser.stops)
+ {
+ GList *list;
+
+ for (list = parser.stops; list; list = list->next)
+ g_slice_free (SvgStop, list->data);
+
+ g_list_free (parser.stops);
+ }
+
+ return g_list_reverse (parser.gradients);
+}
+
+static void
+svg_parser_start_element (GMarkupParseContext *context,
+ const gchar *element_name,
+ const gchar **attribute_names,
+ const gchar **attribute_values,
+ gpointer user_data,
+ GError **error)
+{
+ SvgParser *parser = user_data;
+
+ if (! parser->gradient && strcmp (element_name, "linearGradient") == 0)
+ {
+ const gchar *name = NULL;
+
+ while (*attribute_names && *attribute_values)
+ {
+ if (strcmp (*attribute_names, "id") == 0 && *attribute_values)
+ name = *attribute_values;
+
+ attribute_names++;
+ attribute_values++;
+ }
+
+ parser->gradient = g_object_new (GIMP_TYPE_GRADIENT,
+ "name", name,
+ "mime-type", "image/svg+xml",
+ NULL);
+ }
+ else if (parser->gradient && strcmp (element_name, "stop") == 0)
+ {
+ SvgStop *stop = svg_parse_gradient_stop (attribute_names,
+ attribute_values);
+
+ /* The spec clearly states that each gradient stop's offset
+ * value is required to be equal to or greater than the
+ * previous gradient stop's offset value.
+ */
+ if (parser->stops)
+ stop->offset = MAX (stop->offset,
+ ((SvgStop *) parser->stops->data)->offset);
+
+ parser->stops = g_list_prepend (parser->stops, stop);
+ }
+}
+
+static void
+svg_parser_end_element (GMarkupParseContext *context,
+ const gchar *element_name,
+ gpointer user_data,
+ GError **error)
+{
+ SvgParser *parser = user_data;
+
+ if (parser->gradient &&
+ strcmp (element_name, "linearGradient") == 0)
+ {
+ GList *list;
+
+ parser->gradient->segments = svg_parser_gradient_segments (parser->stops);
+
+ for (list = parser->stops; list; list = list->next)
+ g_slice_free (SvgStop, list->data);
+
+ g_list_free (parser->stops);
+ parser->stops = NULL;
+
+ if (parser->gradient->segments)
+ parser->gradients = g_list_prepend (parser->gradients,
+ parser->gradient);
+ else
+ g_object_unref (parser->gradient);
+
+ parser->gradient = NULL;
+ }
+}
+
+static GimpGradientSegment *
+svg_parser_gradient_segments (GList *stops)
+{
+ GimpGradientSegment *segment;
+ SvgStop *stop;
+ GList *list;
+
+ if (! stops)
+ return NULL;
+
+ stop = stops->data;
+
+ segment = gimp_gradient_segment_new ();
+
+ segment->left_color = stop->color;
+ segment->right_color = stop->color;
+
+ /* the list of offsets is sorted from largest to smallest */
+ for (list = g_list_next (stops); list; list = g_list_next (list))
+ {
+ GimpGradientSegment *next = segment;
+
+ segment->left = stop->offset;
+ segment->middle = (segment->left + segment->right) / 2.0;
+
+ segment = gimp_gradient_segment_new ();
+
+ segment->next = next;
+ next->prev = segment;
+
+ segment->right = stop->offset;
+ segment->right_color = stop->color;
+
+ stop = list->data;
+
+ segment->left_color = stop->color;
+ }
+
+ segment->middle = (segment->left + segment->right) / 2.0;
+
+ if (stop->offset > 0.0)
+ segment->right_color = stop->color;
+
+ /* FIXME: remove empty segments here or add a GimpGradient API to do that
+ */
+
+ return segment;
+}
+
+static void
+svg_parse_gradient_stop_style_prop (SvgStop *stop,
+ const gchar *name,
+ const gchar *value)
+{
+ if (strcmp (name, "stop-color") == 0)
+ {
+ gimp_rgb_parse_css (&stop->color, value, -1);
+ }
+ else if (strcmp (name, "stop-opacity") == 0)
+ {
+ gdouble opacity = g_ascii_strtod (value, NULL);
+
+ if (errno != ERANGE)
+ gimp_rgb_set_alpha (&stop->color, CLAMP (opacity, 0.0, 1.0));
+ }
+}
+
+/* very simplistic CSS style parser */
+static void
+svg_parse_gradient_stop_style (SvgStop *stop,
+ const gchar *style)
+{
+ const gchar *end;
+ const gchar *sep;
+
+ while (*style)
+ {
+ while (g_ascii_isspace (*style))
+ style++;
+
+ for (end = style; *end && *end != ';'; end++)
+ /* do nothing */;
+
+ for (sep = style; sep < end && *sep != ':'; sep++)
+ /* do nothing */;
+
+ if (end > sep && sep > style)
+ {
+ gchar *name;
+ gchar *value;
+
+ name = g_strndup (style, sep - style);
+ sep++;
+ value = g_strndup (sep, end - sep - (*end == ';' ? 1 : 0));
+
+ svg_parse_gradient_stop_style_prop (stop, name, value);
+
+ g_free (value);
+ g_free (name);
+ }
+
+ style = end;
+
+ if (*style == ';')
+ style++;
+ }
+}
+
+static SvgStop *
+svg_parse_gradient_stop (const gchar **names,
+ const gchar **values)
+{
+ SvgStop *stop = g_slice_new0 (SvgStop);
+
+ gimp_rgb_set_alpha (&stop->color, 1.0);
+
+ while (*names && *values)
+ {
+ if (strcmp (*names, "offset") == 0)
+ {
+ gchar *end;
+
+ stop->offset = g_ascii_strtod (*values, &end);
+
+ if (end && *end == '%')
+ stop->offset /= 100.0;
+
+ stop->offset = CLAMP (stop->offset, 0.0, 1.0);
+ }
+ else if (strcmp (*names, "style") == 0)
+ {
+ svg_parse_gradient_stop_style (stop, *values);
+ }
+ else
+ {
+ svg_parse_gradient_stop_style_prop (stop, *names, *values);
+ }
+
+ names++;
+ values++;
+ }
+
+ return stop;
+}
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