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Diffstat (limited to 'app/display/gimpcanvasbufferpreview.c')
| -rw-r--r-- | app/display/gimpcanvasbufferpreview.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/app/display/gimpcanvasbufferpreview.c b/app/display/gimpcanvasbufferpreview.c new file mode 100644 index 0000000..858bab6 --- /dev/null +++ b/app/display/gimpcanvasbufferpreview.c @@ -0,0 +1,263 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpcanvasbufferpreview.c + * Copyright (C) 2013 Marek Dvoroznak <dvoromar@gmail.com> + * + * 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 <gegl.h> +#include <gtk/gtk.h> +#include <cairo/cairo.h> + +#include "libgimpbase/gimpbase.h" +#include "libgimpmath/gimpmath.h" + +#include "display/display-types.h" + +#include "core/gimpimage.h" + +#include "gimpcanvas.h" +#include "gimpcanvasbufferpreview.h" +#include "gimpdisplayshell.h" +#include "gimpdisplayshell-scroll.h" + + +enum +{ + PROP_0, + PROP_BUFFER +}; + + +typedef struct _GimpCanvasBufferPreviewPrivate GimpCanvasBufferPreviewPrivate; + +struct _GimpCanvasBufferPreviewPrivate +{ + GeglBuffer *buffer; +}; + + +#define GET_PRIVATE(transform_preview) \ + ((GimpCanvasBufferPreviewPrivate *) gimp_canvas_buffer_preview_get_instance_private ((GimpCanvasBufferPreview *) (transform_preview))) + + +/* local function prototypes */ + +static void gimp_canvas_buffer_preview_dispose (GObject *object); +static void gimp_canvas_buffer_preview_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec); +static void gimp_canvas_buffer_preview_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec); + +static void gimp_canvas_buffer_preview_draw (GimpCanvasItem *item, + cairo_t *cr); +static cairo_region_t * gimp_canvas_buffer_preview_get_extents (GimpCanvasItem *item); +static void gimp_canvas_buffer_preview_compute_bounds (GimpCanvasItem *item, + cairo_rectangle_int_t *bounds); + + +G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasBufferPreview, gimp_canvas_buffer_preview, + GIMP_TYPE_CANVAS_ITEM) + +#define parent_class gimp_canvas_buffer_preview_parent_class + + +static void +gimp_canvas_buffer_preview_class_init (GimpCanvasBufferPreviewClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass); + + object_class->dispose = gimp_canvas_buffer_preview_dispose; + object_class->set_property = gimp_canvas_buffer_preview_set_property; + object_class->get_property = gimp_canvas_buffer_preview_get_property; + + item_class->draw = gimp_canvas_buffer_preview_draw; + item_class->get_extents = gimp_canvas_buffer_preview_get_extents; + + g_object_class_install_property (object_class, PROP_BUFFER, + g_param_spec_object ("buffer", + NULL, NULL, + GEGL_TYPE_BUFFER, + GIMP_PARAM_READWRITE)); +} + +static void +gimp_canvas_buffer_preview_init (GimpCanvasBufferPreview *transform_preview) +{ +} + +static void +gimp_canvas_buffer_preview_dispose (GObject *object) +{ + GimpCanvasBufferPreviewPrivate *private = GET_PRIVATE (object); + + g_clear_object (&private->buffer); + + G_OBJECT_CLASS (parent_class)->dispose (object); +} + +static void +gimp_canvas_buffer_preview_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + GimpCanvasBufferPreviewPrivate *private = GET_PRIVATE (object); + + switch (property_id) + { + case PROP_BUFFER: + g_set_object (&private->buffer, g_value_get_object (value)); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_canvas_buffer_preview_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GimpCanvasBufferPreviewPrivate *private = GET_PRIVATE (object); + + switch (property_id) + { + case PROP_BUFFER: + g_value_set_object (value, private->buffer); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_canvas_buffer_preview_draw (GimpCanvasItem *item, + cairo_t *cr) +{ + GimpDisplayShell *shell = gimp_canvas_item_get_shell (item); + GeglBuffer *buffer = GET_PRIVATE (item)->buffer; + cairo_surface_t *area; + guchar *data; + cairo_rectangle_int_t rectangle; + + g_return_if_fail (GEGL_IS_BUFFER (buffer)); + + gimp_canvas_buffer_preview_compute_bounds (item, &rectangle); + + area = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, + rectangle.width, + rectangle.height); + + data = cairo_image_surface_get_data (area); + gegl_buffer_get (buffer, + GEGL_RECTANGLE (rectangle.x + shell->offset_x, + rectangle.y + shell->offset_y, + rectangle.width, + rectangle.height), + shell->scale_x, + babl_format ("cairo-ARGB32"), + data, + cairo_image_surface_get_stride (area), + GEGL_ABYSS_NONE); + + cairo_surface_flush (area); + cairo_surface_mark_dirty (area); + + cairo_set_source_surface (cr, area, rectangle.x, rectangle.y); + cairo_rectangle (cr, + rectangle.x, rectangle.y, + rectangle.width, rectangle.height); + cairo_fill (cr); + + cairo_surface_destroy (area); +} + +static void +gimp_canvas_buffer_preview_compute_bounds (GimpCanvasItem *item, + cairo_rectangle_int_t *bounds) +{ + GimpDisplayShell *shell = gimp_canvas_item_get_shell (item); + GeglBuffer *buffer = GET_PRIVATE (item)->buffer; + GeglRectangle extent; + gdouble x1, y1; + gdouble x2, y2; + + g_return_if_fail (GEGL_IS_BUFFER (buffer)); + + extent = *gegl_buffer_get_extent (buffer); + + gimp_canvas_item_transform_xy_f (item, + extent.x, + extent.y, + &x1, &y1); + gimp_canvas_item_transform_xy_f (item, + extent.x + extent.width, + extent.y + extent.height, + &x2, &y2); + + extent.x = floor (x1); + extent.y = floor (y1); + extent.width = ceil (x2) - extent.x; + extent.height = ceil (y2) - extent.y; + + gegl_rectangle_intersect (&extent, + &extent, + GEGL_RECTANGLE (0, + 0, + shell->disp_width, + shell->disp_height)); + + bounds->x = extent.x; + bounds->y = extent.y; + bounds->width = extent.width; + bounds->height = extent.height; +} + +static cairo_region_t * +gimp_canvas_buffer_preview_get_extents (GimpCanvasItem *item) +{ + cairo_rectangle_int_t rectangle; + + gimp_canvas_buffer_preview_compute_bounds (item, &rectangle); + + return cairo_region_create_rectangle (&rectangle); +} + +GimpCanvasItem * +gimp_canvas_buffer_preview_new (GimpDisplayShell *shell, + GeglBuffer *buffer) +{ + g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL); + g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL); + + return g_object_new (GIMP_TYPE_CANVAS_BUFFER_PREVIEW, + "shell", shell, + "buffer", buffer, + NULL); +} |