PIKApp/app/core/pikaimage-preview.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* 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 <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikacolor/pikacolor.h"
#include "core-types.h"
#include "gegl/pika-babl.h"
#include "gegl/pika-gegl-loops.h"
#include "pikaimage.h"
#include "pikaimage-color-profile.h"
#include "pikaimage-preview.h"
#include "pikapickable.h"
#include "pikaprojectable.h"
#include "pikaprojection.h"
#include "pikatempbuf.h"
const Babl *
pika_image_get_preview_format (PikaImage *image)
{
g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
switch (pika_image_get_base_type (image))
{
case PIKA_RGB:
case PIKA_GRAY:
return pika_babl_format_change_component_type (
pika_projectable_get_format (PIKA_PROJECTABLE (image)),
PIKA_COMPONENT_TYPE_U8);
case PIKA_INDEXED:
return babl_format ("R'G'B'A u8");
}
g_return_val_if_reached (NULL);
}
void
pika_image_get_preview_size (PikaViewable *viewable,
gint size,
gboolean is_popup,
gboolean dot_for_dot,
gint *width,
gint *height)
{
PikaImage *image = PIKA_IMAGE (viewable);
gdouble xres;
gdouble yres;
pika_image_get_resolution (image, &xres, &yres);
pika_viewable_calc_preview_size (pika_image_get_width (image),
pika_image_get_height (image),
size,
size,
dot_for_dot,
xres,
yres,
width,
height,
NULL);
}
gboolean
pika_image_get_popup_size (PikaViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
PikaImage *image = PIKA_IMAGE (viewable);
if (pika_image_get_width (image) > width ||
pika_image_get_height (image) > height)
{
gboolean scaling_up;
pika_viewable_calc_preview_size (pika_image_get_width (image),
pika_image_get_height (image),
width * 2,
height * 2,
dot_for_dot, 1.0, 1.0,
popup_width,
popup_height,
&scaling_up);
if (scaling_up)
{
*popup_width = pika_image_get_width (image);
*popup_height = pika_image_get_height (image);
}
return TRUE;
}
return FALSE;
}
PikaTempBuf *
pika_image_get_new_preview (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaImage *image = PIKA_IMAGE (viewable);
const Babl *format;
PikaTempBuf *buf;
gdouble scale_x;
gdouble scale_y;
scale_x = (gdouble) width / (gdouble) pika_image_get_width (image);
scale_y = (gdouble) height / (gdouble) pika_image_get_height (image);
format = pika_image_get_preview_format (image);
buf = pika_temp_buf_new (width, height, format);
gegl_buffer_get (pika_pickable_get_buffer (PIKA_PICKABLE (image)),
GEGL_RECTANGLE (0, 0, width, height),
MIN (scale_x, scale_y),
pika_temp_buf_get_format (buf),
pika_temp_buf_get_data (buf),
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_CLAMP);
return buf;
}
GdkPixbuf *
pika_image_get_new_pixbuf (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaImage *image = PIKA_IMAGE (viewable);
GdkPixbuf *pixbuf;
gdouble scale_x;
gdouble scale_y;
PikaColorTransform *transform;
scale_x = (gdouble) width / (gdouble) pika_image_get_width (image);
scale_y = (gdouble) height / (gdouble) pika_image_get_height (image);
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
width, height);
transform = pika_image_get_color_transform_to_srgb_u8 (image);
if (transform)
{
PikaTempBuf *temp_buf;
GeglBuffer *src_buf;
GeglBuffer *dest_buf;
temp_buf = pika_temp_buf_new (width, height,
pika_pickable_get_format (PIKA_PICKABLE (image)));
gegl_buffer_get (pika_pickable_get_buffer (PIKA_PICKABLE (image)),
GEGL_RECTANGLE (0, 0, width, height),
MIN (scale_x, scale_y),
pika_temp_buf_get_format (temp_buf),
pika_temp_buf_get_data (temp_buf),
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_CLAMP);
src_buf = pika_temp_buf_create_buffer (temp_buf);
dest_buf = pika_pixbuf_create_buffer (pixbuf);
pika_temp_buf_unref (temp_buf);
pika_color_transform_process_buffer (transform,
src_buf,
GEGL_RECTANGLE (0, 0,
width, height),
dest_buf,
GEGL_RECTANGLE (0, 0, 0, 0));
g_object_unref (src_buf);
g_object_unref (dest_buf);
}
else
{
gegl_buffer_get (pika_pickable_get_buffer (PIKA_PICKABLE (image)),
GEGL_RECTANGLE (0, 0, width, height),
MIN (scale_x, scale_y),
pika_pixbuf_get_format (pixbuf),
gdk_pixbuf_get_pixels (pixbuf),
gdk_pixbuf_get_rowstride (pixbuf),
GEGL_ABYSS_CLAMP);
}
return pixbuf;
}