268 lines
9.1 KiB
C
268 lines
9.1 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikacanvasbufferpreview.c
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* Copyright (C) 2013 Marek Dvoroznak <dvoromar@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include <cairo.h>
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#include "libpikabase/pikabase.h"
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#include "libpikamath/pikamath.h"
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#include "display/display-types.h"
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#include "core/pikaimage.h"
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#include "pikacanvas.h"
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#include "pikacanvasbufferpreview.h"
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#include "pikadisplayshell.h"
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#include "pikadisplayshell-scroll.h"
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enum
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{
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PROP_0,
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PROP_BUFFER
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};
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typedef struct _PikaCanvasBufferPreviewPrivate PikaCanvasBufferPreviewPrivate;
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struct _PikaCanvasBufferPreviewPrivate
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{
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GeglBuffer *buffer;
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};
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#define GET_PRIVATE(transform_preview) \
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((PikaCanvasBufferPreviewPrivate *) pika_canvas_buffer_preview_get_instance_private ((PikaCanvasBufferPreview *) (transform_preview)))
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/* local function prototypes */
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static void pika_canvas_buffer_preview_dispose (GObject *object);
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static void pika_canvas_buffer_preview_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_buffer_preview_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_buffer_preview_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_buffer_preview_get_extents (PikaCanvasItem *item);
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static void pika_canvas_buffer_preview_compute_bounds (PikaCanvasItem *item,
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cairo_rectangle_int_t *bounds);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasBufferPreview, pika_canvas_buffer_preview,
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PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_buffer_preview_parent_class
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static void
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pika_canvas_buffer_preview_class_init (PikaCanvasBufferPreviewClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
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object_class->dispose = pika_canvas_buffer_preview_dispose;
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object_class->set_property = pika_canvas_buffer_preview_set_property;
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object_class->get_property = pika_canvas_buffer_preview_get_property;
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item_class->draw = pika_canvas_buffer_preview_draw;
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item_class->get_extents = pika_canvas_buffer_preview_get_extents;
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g_object_class_install_property (object_class, PROP_BUFFER,
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g_param_spec_object ("buffer",
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NULL, NULL,
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GEGL_TYPE_BUFFER,
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PIKA_PARAM_READWRITE));
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}
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static void
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pika_canvas_buffer_preview_init (PikaCanvasBufferPreview *transform_preview)
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{
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}
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static void
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pika_canvas_buffer_preview_dispose (GObject *object)
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{
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PikaCanvasBufferPreviewPrivate *private = GET_PRIVATE (object);
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g_clear_object (&private->buffer);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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pika_canvas_buffer_preview_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasBufferPreviewPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_BUFFER:
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g_set_object (&private->buffer, g_value_get_object (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_buffer_preview_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasBufferPreviewPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_BUFFER:
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g_value_set_object (value, private->buffer);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_buffer_preview_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
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GeglBuffer *buffer = GET_PRIVATE (item)->buffer;
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cairo_surface_t *area;
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guchar *data;
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cairo_rectangle_int_t rectangle;
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g_return_if_fail (GEGL_IS_BUFFER (buffer));
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pika_canvas_buffer_preview_compute_bounds (item, &rectangle);
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area = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
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rectangle.width,
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rectangle.height);
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data = cairo_image_surface_get_data (area);
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gegl_buffer_get (buffer,
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GEGL_RECTANGLE (rectangle.x + shell->offset_x,
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rectangle.y + shell->offset_y,
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rectangle.width,
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rectangle.height),
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shell->scale_x,
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babl_format ("cairo-ARGB32"),
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data,
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cairo_image_surface_get_stride (area),
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GEGL_ABYSS_NONE);
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cairo_surface_flush (area);
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cairo_surface_mark_dirty (area);
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cairo_set_source_surface (cr, area, rectangle.x, rectangle.y);
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cairo_rectangle (cr,
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rectangle.x, rectangle.y,
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rectangle.width, rectangle.height);
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cairo_fill (cr);
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cairo_surface_destroy (area);
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}
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static void
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pika_canvas_buffer_preview_compute_bounds (PikaCanvasItem *item,
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cairo_rectangle_int_t *bounds)
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{
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PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
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GeglBuffer *buffer = GET_PRIVATE (item)->buffer;
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GeglRectangle extent;
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gdouble x1, y1;
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gdouble x2, y2;
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g_return_if_fail (GEGL_IS_BUFFER (buffer));
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extent = *gegl_buffer_get_extent (buffer);
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pika_canvas_item_transform_xy_f (item,
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extent.x,
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extent.y,
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&x1, &y1);
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pika_canvas_item_transform_xy_f (item,
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extent.x + extent.width,
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extent.y + extent.height,
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&x2, &y2);
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extent.x = floor (x1);
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extent.y = floor (y1);
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extent.width = ceil (x2) - extent.x;
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extent.height = ceil (y2) - extent.y;
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gegl_rectangle_intersect (&extent,
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&extent,
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GEGL_RECTANGLE (0,
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0,
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shell->disp_width,
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shell->disp_height));
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bounds->x = extent.x;
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bounds->y = extent.y;
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bounds->width = extent.width;
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bounds->height = extent.height;
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}
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static cairo_region_t *
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pika_canvas_buffer_preview_get_extents (PikaCanvasItem *item)
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{
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cairo_rectangle_int_t rectangle;
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pika_canvas_buffer_preview_compute_bounds (item, &rectangle);
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return cairo_region_create_rectangle (&rectangle);
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}
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PikaCanvasItem *
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pika_canvas_buffer_preview_new (PikaDisplayShell *shell,
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GeglBuffer *buffer)
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{
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g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
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g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
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return g_object_new (PIKA_TYPE_CANVAS_BUFFER_PREVIEW,
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"shell", shell,
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"buffer", buffer,
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NULL);
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}
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