render: Rename gtkthemingbackground.[ch]

I want the gtkrender prefix for all filenames about rendering.

1 files changed, 346 insertions, 0 deletions

diff --git a/gtk/gtkrenderbackground.c b/gtk/gtkrenderbackground.c
new file mode 100644
index 0000000000..5b3591d298
--- /dev/null
+++ b/gtk/gtkrenderbackground.c
@@ -0,0 +1,346 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
+ * Copyright (C) 2011 Red Hat, Inc.
+ * 
+ * Authors: Carlos Garnacho <carlosg@gnome.org>
+ *          Cosimo Cecchi <cosimoc@gnome.org>
+ *
+ * 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 2 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
+ * Lesser 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gtkrenderbackgroundprivate.h"
+
+#include "gtkcssarrayvalueprivate.h"
+#include "gtkcssbgsizevalueprivate.h"
+#include "gtkcssenumvalueprivate.h"
+#include "gtkcssimagevalueprivate.h"
+#include "gtkcssnumbervalueprivate.h"
+#include "gtkcssshadowsvalueprivate.h"
+#include "gtkcsspositionvalueprivate.h"
+#include "gtkcssrepeatvalueprivate.h"
+#include "gtkcssrgbavalueprivate.h"
+#include "gtkcssstyleprivate.h"
+#include "gtkcsstypesprivate.h"
+
+#include <math.h>
+
+#include <gdk/gdk.h>
+
+/* this is in case round() is not provided by the compiler, 
+ * such as in the case of C89 compilers, like MSVC
+ */
+#include "fallback-c89.c"
+
+typedef struct _GtkThemingBackground GtkThemingBackground;
+
+#define N_BOXES (3)
+
+struct _GtkThemingBackground {
+  GtkCssStyle *style;
+
+  GtkRoundedBox boxes[N_BOXES];
+};
+
+static void
+_gtk_theming_background_paint_color (GtkThemingBackground *bg,
+                                     cairo_t              *cr,
+                                     const GdkRGBA        *bg_color,
+                                     GtkCssValue          *background_image)
+{
+  gint n_values = _gtk_css_array_value_get_n_values (background_image);
+  GtkCssArea clip = _gtk_css_area_value_get 
+    (_gtk_css_array_value_get_nth 
+     (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_CLIP), 
+      n_values - 1));
+
+  _gtk_rounded_box_path (&bg->boxes[clip], cr);
+  gdk_cairo_set_source_rgba (cr, bg_color);
+  cairo_fill (cr);
+}
+
+static void
+_gtk_theming_background_paint_layer (GtkThemingBackground *bg,
+                                     guint                 idx,
+                                     cairo_t              *cr)
+{
+  GtkCssRepeatStyle hrepeat, vrepeat;
+  const GtkCssValue *pos, *repeat;
+  GtkCssImage *image;
+  const GtkRoundedBox *origin;
+  double image_width, image_height;
+  double width, height;
+
+  pos = _gtk_css_array_value_get_nth (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_POSITION), idx);
+  repeat = _gtk_css_array_value_get_nth (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_REPEAT), idx);
+  hrepeat = _gtk_css_background_repeat_value_get_x (repeat);
+  vrepeat = _gtk_css_background_repeat_value_get_y (repeat);
+  image = _gtk_css_image_value_get_image (
+              _gtk_css_array_value_get_nth (
+                  gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_IMAGE),
+                  idx));
+  origin = &bg->boxes[
+               _gtk_css_area_value_get (
+                   _gtk_css_array_value_get_nth (
+                       gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_ORIGIN),
+                       idx))];
+  width = origin->box.width;
+  height = origin->box.height;
+
+  if (image == NULL || width <= 0 || height <= 0)
+    return;
+
+  _gtk_css_bg_size_value_compute_size (_gtk_css_array_value_get_nth (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_SIZE), idx),
+                                       image,
+                                       width,
+                                       height,
+                                       &image_width,
+                                       &image_height);
+
+  if (image_width <= 0 || image_height <= 0)
+    return;
+
+  /* optimization */
+  if (image_width == width)
+    hrepeat = GTK_CSS_REPEAT_STYLE_NO_REPEAT;
+  if (image_height == height)
+    vrepeat = GTK_CSS_REPEAT_STYLE_NO_REPEAT;
+
+
+  cairo_save (cr);
+
+  _gtk_rounded_box_path (
+      &bg->boxes[
+          _gtk_css_area_value_get (
+              _gtk_css_array_value_get_nth (
+                  gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_CLIP),
+                  idx))],
+      cr);
+  cairo_clip (cr);
+
+
+  cairo_translate (cr, origin->box.x, origin->box.y);
+
+  if (hrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT && vrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
+    {
+      cairo_translate (cr,
+                       _gtk_css_position_value_get_x (pos, width - image_width),
+                       _gtk_css_position_value_get_y (pos, height - image_height));
+      /* shortcut for normal case */
+      _gtk_css_image_draw (image, cr, image_width, image_height);
+    }
+  else
+    {
+      int surface_width, surface_height;
+      cairo_rectangle_t fill_rect;
+      cairo_surface_t *surface;
+      cairo_t *cr2;
+
+      /* If ‘background-repeat’ is ‘round’ for one (or both) dimensions,
+       * there is a second step. The UA must scale the image in that
+       * dimension (or both dimensions) so that it fits a whole number of
+       * times in the background positioning area. In the case of the width
+       * (height is analogous):
+       *
+       * If X ≠ 0 is the width of the image after step one and W is the width
+       * of the background positioning area, then the rounded width
+       * X' = W / round(W / X) where round() is a function that returns the
+       * nearest natural number (integer greater than zero). 
+       *
+       * If ‘background-repeat’ is ‘round’ for one dimension only and if
+       * ‘background-size’ is ‘auto’ for the other dimension, then there is
+       * a third step: that other dimension is scaled so that the original
+       * aspect ratio is restored. 
+       */
+      if (hrepeat == GTK_CSS_REPEAT_STYLE_ROUND)
+        {
+          double n = round (width / image_width);
+
+          n = MAX (1, n);
+
+          if (vrepeat != GTK_CSS_REPEAT_STYLE_ROUND
+              /* && vsize == auto (it is by default) */)
+            image_height *= width / (image_width * n);
+          image_width = width / n;
+        }
+      if (vrepeat == GTK_CSS_REPEAT_STYLE_ROUND)
+        {
+          double n = round (height / image_height);
+
+          n = MAX (1, n);
+
+          if (hrepeat != GTK_CSS_REPEAT_STYLE_ROUND
+              /* && hsize == auto (it is by default) */)
+            image_width *= height / (image_height * n);
+          image_height = height / n;
+        }
+
+      /* if hrepeat or vrepeat is 'space', we create a somewhat larger surface
+       * to store the extra space. */
+      if (hrepeat == GTK_CSS_REPEAT_STYLE_SPACE)
+        {
+          double n = floor (width / image_width);
+          surface_width = n ? round (width / n) : 0;
+        }
+      else
+        surface_width = round (image_width);
+
+      if (vrepeat == GTK_CSS_REPEAT_STYLE_SPACE)
+        {
+          double n = floor (height / image_height);
+          surface_height = n ? round (height / n) : 0;
+        }
+      else
+        surface_height = round (image_height);
+
+      surface = cairo_surface_create_similar (cairo_get_target (cr),
+                                              CAIRO_CONTENT_COLOR_ALPHA,
+                                              surface_width, surface_height);
+      cr2 = cairo_create (surface);
+      cairo_translate (cr2,
+                       0.5 * (surface_width - image_width),
+                       0.5 * (surface_height - image_height));
+      _gtk_css_image_draw (image, cr2, image_width, image_height);
+      cairo_destroy (cr2);
+
+      cairo_set_source_surface (cr, surface,
+                                _gtk_css_position_value_get_x (pos, width - image_width),
+                                _gtk_css_position_value_get_y (pos, height - image_height));
+      cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
+      cairo_surface_destroy (surface);
+
+      if (hrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
+        {
+          fill_rect.x = _gtk_css_position_value_get_x (pos, width - image_width);
+          fill_rect.width = image_width;
+        }
+      else
+        {
+          fill_rect.x = 0;
+          fill_rect.width = width;
+        }
+
+      if (vrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
+        {
+          fill_rect.y = _gtk_css_position_value_get_y (pos, height - image_height);
+          fill_rect.height = image_height;
+        }
+      else
+        {
+          fill_rect.y = 0;
+          fill_rect.height = height;
+        }
+
+      cairo_rectangle (cr, fill_rect.x, fill_rect.y,
+                       fill_rect.width, fill_rect.height);
+      cairo_fill (cr);
+    }
+
+
+  cairo_restore (cr);
+}
+
+static void
+_gtk_theming_background_init_style (GtkThemingBackground *bg,
+                                    double                width,
+                                    double                height,
+                                    GtkJunctionSides      junction)
+{
+  GtkBorder border, padding;
+
+  border.top = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BORDER_TOP_WIDTH), 100);
+  border.right = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BORDER_RIGHT_WIDTH), 100);
+  border.bottom = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BORDER_BOTTOM_WIDTH), 100);
+  border.left = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BORDER_LEFT_WIDTH), 100);
+  padding.top = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_PADDING_TOP), 100);
+  padding.right = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_PADDING_RIGHT), 100);
+  padding.bottom = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_PADDING_BOTTOM), 100);
+  padding.left = _gtk_css_number_value_get (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_PADDING_LEFT), 100);
+
+  /* In the CSS box model, by default the background positioning area is
+   * the padding-box, i.e. all the border-box minus the borders themselves,
+   * which determines also its default size, see
+   * http://dev.w3.org/csswg/css3-background/#background-origin
+   *
+   * In the future we might want to support different origins or clips, but
+   * right now we just shrink to the default.
+   */
+  _gtk_rounded_box_init_rect (&bg->boxes[GTK_CSS_AREA_BORDER_BOX], 0, 0, width, height);
+  _gtk_rounded_box_apply_border_radius_for_style (&bg->boxes[GTK_CSS_AREA_BORDER_BOX], bg->style, junction);
+
+  bg->boxes[GTK_CSS_AREA_PADDING_BOX] = bg->boxes[GTK_CSS_AREA_BORDER_BOX];
+  _gtk_rounded_box_shrink (&bg->boxes[GTK_CSS_AREA_PADDING_BOX],
+			   border.top, border.right,
+			   border.bottom, border.left);
+
+  bg->boxes[GTK_CSS_AREA_CONTENT_BOX] = bg->boxes[GTK_CSS_AREA_PADDING_BOX];
+  _gtk_rounded_box_shrink (&bg->boxes[GTK_CSS_AREA_CONTENT_BOX],
+			   padding.top, padding.right,
+			   padding.bottom, padding.left);
+}
+
+void
+gtk_css_style_render_background (GtkCssStyle      *style,
+                                 cairo_t          *cr,
+                                 gdouble           x,
+                                 gdouble           y,
+                                 gdouble           width,
+                                 gdouble           height,
+                                 GtkJunctionSides  junction)
+{
+  GtkThemingBackground bg;
+  gint idx;
+  GtkCssValue *background_image;
+  GtkCssValue *box_shadow;
+  const GdkRGBA *bg_color;
+
+  background_image = gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BACKGROUND_IMAGE);
+  bg_color = _gtk_css_rgba_value_get_rgba (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BACKGROUND_COLOR));
+  box_shadow = gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BOX_SHADOW);
+
+  /* This is the common default case of no background */
+  if (gtk_rgba_is_clear (bg_color) &&
+      _gtk_css_array_value_get_n_values (background_image) == 1 &&
+      _gtk_css_image_value_get_image (_gtk_css_array_value_get_nth (background_image, 0)) == NULL &&
+      _gtk_css_shadows_value_is_none (box_shadow))
+    return;
+
+  bg.style = style;
+  _gtk_theming_background_init_style (&bg, width, height, junction);
+
+  cairo_save (cr);
+  cairo_translate (cr, x, y);
+
+  /* Outset shadows */
+  _gtk_css_shadows_value_paint_box (box_shadow,
+                                    cr,
+                                    &bg.boxes[GTK_CSS_AREA_BORDER_BOX],
+                                    FALSE);
+
+  _gtk_theming_background_paint_color (&bg, cr, bg_color, background_image);
+
+  for (idx = _gtk_css_array_value_get_n_values (background_image) - 1; idx >= 0; idx--)
+    {
+      _gtk_theming_background_paint_layer (&bg, idx, cr);
+    }
+
+  /* Inset shadows */
+  _gtk_css_shadows_value_paint_box (box_shadow,
+                                    cr,
+                                    &bg.boxes[GTK_CSS_AREA_PADDING_BOX],
+                                    TRUE);
+
+  cairo_restore (cr);
+}