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Gimp/app/core/gimpdrawable-preview.c
Jehan 0a12e66709 app, pdb: use the real theme background color for brushes with GIMP_VIEW_BG_USE_STYLE. 
Previous code was using the correct background color from the theme, but
the foreground color was always either white or black (depending on GUI
config color scheme). Instead, just use the foreground color from theme.

Since core/ doesn't have access to GTK, hence the theme, we had to
update GimpViewable's get_preview() and get_pixbuf() abstract methods to
have a color argument for recoloring previews (when relevant, which for
most types of viewables is not).

(cherry picked from commit 3038c751bc)
2025-08-09 18:11:12 +02:00

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/* 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 <string.h>
#include <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "config/gimpcoreconfig.h"
#include "gegl/gimp-babl.h"
#include "gegl/gimp-gegl-loops.h"
#include "gegl/gimptilehandlervalidate.h"
#include "gimp.h"
#include "gimp-parallel.h"
#include "gimp-utils.h"
#include "gimpasync.h"
#include "gimpchannel.h"
#include "gimpchunkiterator.h"
#include "gimpimage.h"
#include "gimpimage-color-profile.h"
#include "gimpdrawable-preview.h"
#include "gimpdrawable-private.h"
#include "gimplayer.h"
#include "gimptempbuf.h"
#include "gimp-priorities.h"
typedef struct
{
const Babl *format;
GeglBuffer *buffer;
GeglRectangle rect;
gdouble scale;
GimpChunkIterator *iter;
} SubPreviewData;
/* local function prototypes */
static SubPreviewData * sub_preview_data_new (const Babl *format,
GeglBuffer *buffer,
const GeglRectangle *rect,
gdouble scale);
static void sub_preview_data_free (SubPreviewData *data);
/* private functions */
static SubPreviewData *
sub_preview_data_new (const Babl *format,
GeglBuffer *buffer,
const GeglRectangle *rect,
gdouble scale)
{
SubPreviewData *data = g_slice_new (SubPreviewData);
data->format = format;
/* We take ownership if the buffer reference. */
data->buffer = buffer;
data->rect = *rect;
data->scale = scale;
data->iter = NULL;
return data;
}
static void
sub_preview_data_free (SubPreviewData *data)
{
g_object_unref (data->buffer);
if (data->iter)
gimp_chunk_iterator_stop (data->iter, TRUE);
g_slice_free (SubPreviewData, data);
}
/* public functions */
GimpTempBuf *
gimp_drawable_get_new_preview (GimpViewable *viewable,
GimpContext *context,
gint width,
gint height,
GeglColor *color G_GNUC_UNUSED)
{
GimpItem *item = GIMP_ITEM (viewable);
GimpImage *image = gimp_item_get_image (item);
if (! image->gimp->config->layer_previews)
return NULL;
return gimp_drawable_get_sub_preview (GIMP_DRAWABLE (viewable),
0, 0,
gimp_item_get_width (item),
gimp_item_get_height (item),
width,
height);
}
GdkPixbuf *
gimp_drawable_get_new_pixbuf (GimpViewable *viewable,
GimpContext *context,
gint width,
gint height,
GeglColor *color G_GNUC_UNUSED)
{
GimpItem *item = GIMP_ITEM (viewable);
GimpImage *image = gimp_item_get_image (item);
if (! image->gimp->config->layer_previews)
return NULL;
return gimp_drawable_get_sub_pixbuf (GIMP_DRAWABLE (viewable),
0, 0,
gimp_item_get_width (item),
gimp_item_get_height (item),
width,
height);
}
const Babl *
gimp_drawable_get_preview_format (GimpDrawable *drawable)
{
const Babl *space;
gboolean alpha;
GimpTRCType trc;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
space = gimp_drawable_get_space (drawable);
alpha = gimp_drawable_has_alpha (drawable);
trc = gimp_drawable_get_trc (drawable);
switch (gimp_drawable_get_base_type (drawable))
{
case GIMP_RGB:
case GIMP_GRAY:
return gimp_drawable_get_format (drawable);
case GIMP_INDEXED:
return gimp_babl_format (GIMP_RGB,
gimp_babl_precision (GIMP_COMPONENT_TYPE_U8,
trc),
alpha, space);
}
g_return_val_if_reached (NULL);
}
GimpTempBuf *
gimp_drawable_get_sub_preview (GimpDrawable *drawable,
gint src_x,
gint src_y,
gint src_width,
gint src_height,
gint dest_width,
gint dest_height)
{
GimpItem *item;
GimpImage *image;
GeglBuffer *buffer;
GimpTempBuf *preview;
gdouble scale;
gint scaled_x;
gint scaled_y;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (src_x >= 0, NULL);
g_return_val_if_fail (src_y >= 0, NULL);
g_return_val_if_fail (src_width > 0, NULL);
g_return_val_if_fail (src_height > 0, NULL);
g_return_val_if_fail (dest_width > 0, NULL);
g_return_val_if_fail (dest_height > 0, NULL);
item = GIMP_ITEM (drawable);
g_return_val_if_fail ((src_x + src_width) <= gimp_item_get_width (item), NULL);
g_return_val_if_fail ((src_y + src_height) <= gimp_item_get_height (item), NULL);
image = gimp_item_get_image (item);
if (! image->gimp->config->layer_previews)
return NULL;
buffer = gimp_drawable_get_buffer_with_effects (drawable);
preview = gimp_temp_buf_new (dest_width, dest_height,
gimp_drawable_get_preview_format (drawable));
scale = MIN ((gdouble) dest_width / (gdouble) src_width,
(gdouble) dest_height / (gdouble) src_height);
scaled_x = RINT ((gdouble) src_x * scale);
scaled_y = RINT ((gdouble) src_y * scale);
gegl_buffer_get (buffer,
GEGL_RECTANGLE (scaled_x, scaled_y, dest_width, dest_height),
scale,
gimp_temp_buf_get_format (preview),
gimp_temp_buf_get_data (preview),
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_CLAMP);
g_object_unref (buffer);
return preview;
}
GdkPixbuf *
gimp_drawable_get_sub_pixbuf (GimpDrawable *drawable,
gint src_x,
gint src_y,
gint src_width,
gint src_height,
gint dest_width,
gint dest_height)
{
GimpItem *item;
GimpImage *image;
GeglBuffer *buffer;
GdkPixbuf *pixbuf;
gdouble scale;
gint scaled_x;
gint scaled_y;
GimpColorTransform *transform;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (src_x >= 0, NULL);
g_return_val_if_fail (src_y >= 0, NULL);
g_return_val_if_fail (src_width > 0, NULL);
g_return_val_if_fail (src_height > 0, NULL);
g_return_val_if_fail (dest_width > 0, NULL);
g_return_val_if_fail (dest_height > 0, NULL);
item = GIMP_ITEM (drawable);
g_return_val_if_fail ((src_x + src_width) <= gimp_item_get_width (item), NULL);
g_return_val_if_fail ((src_y + src_height) <= gimp_item_get_height (item), NULL);
image = gimp_item_get_image (item);
if (! image->gimp->config->layer_previews)
return NULL;
buffer = gimp_drawable_get_buffer_with_effects (drawable);
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
dest_width, dest_height);
scale = MIN ((gdouble) dest_width / (gdouble) src_width,
(gdouble) dest_height / (gdouble) src_height);
scaled_x = RINT ((gdouble) src_x * scale);
scaled_y = RINT ((gdouble) src_y * scale);
transform = gimp_image_get_color_transform_to_srgb_u8 (image);
if (transform)
{
GimpTempBuf *temp_buf;
GeglBuffer *src_buf;
GeglBuffer *dest_buf;
temp_buf = gimp_temp_buf_new (dest_width, dest_height,
gimp_drawable_get_format (drawable));
gegl_buffer_get (buffer,
GEGL_RECTANGLE (scaled_x, scaled_y,
dest_width, dest_height),
scale,
gimp_temp_buf_get_format (temp_buf),
gimp_temp_buf_get_data (temp_buf),
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_CLAMP);
src_buf = gimp_temp_buf_create_buffer (temp_buf);
dest_buf = gimp_pixbuf_create_buffer (pixbuf);
gimp_temp_buf_unref (temp_buf);
gimp_color_transform_process_buffer (transform,
src_buf,
GEGL_RECTANGLE (0, 0,
dest_width, dest_height),
dest_buf,
GEGL_RECTANGLE (0, 0, 0, 0));
g_object_unref (src_buf);
g_object_unref (dest_buf);
}
else
{
gegl_buffer_get (buffer,
GEGL_RECTANGLE (scaled_x, scaled_y,
dest_width, dest_height),
scale,
gimp_pixbuf_get_format (pixbuf),
gdk_pixbuf_get_pixels (pixbuf),
gdk_pixbuf_get_rowstride (pixbuf),
GEGL_ABYSS_CLAMP);
}
g_object_unref (buffer);
return pixbuf;
}
static void
gimp_drawable_get_sub_preview_async_func (GimpAsync *async,
SubPreviewData *data)
{
GimpTempBuf *preview;
GimpTileHandlerValidate *validate;
preview = gimp_temp_buf_new (data->rect.width, data->rect.height,
data->format);
validate = gimp_tile_handler_validate_get_assigned (data->buffer);
if (validate)
{
if (! data->iter)
{
cairo_region_t *region;
cairo_rectangle_int_t rect;
rect.x = floor (data->rect.x / data->scale);
rect.y = floor (data->rect.y / data->scale);
rect.width = ceil ((data->rect.x + data->rect.width) /
data->scale) - rect.x;
rect.height = ceil ((data->rect.x + data->rect.height) /
data->scale) - rect.y;
region = cairo_region_copy (validate->dirty_region);
cairo_region_intersect_rectangle (region, &rect);
data->iter = gimp_chunk_iterator_new (region);
}
if (gimp_chunk_iterator_next (data->iter))
{
GeglRectangle rect;
gimp_tile_handler_validate_begin_validate (validate);
while (gimp_chunk_iterator_get_rect (data->iter, &rect))
{
gimp_tile_handler_validate_validate (validate,
data->buffer, &rect,
FALSE, FALSE);
}
gimp_tile_handler_validate_end_validate (validate);
return;
}
data->iter = NULL;
}
gegl_buffer_get (data->buffer, &data->rect, data->scale,
gimp_temp_buf_get_format (preview),
gimp_temp_buf_get_data (preview),
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_CLAMP);
sub_preview_data_free (data);
gimp_async_finish_full (async,
preview,
(GDestroyNotify) gimp_temp_buf_unref);
}
GimpAsync *
gimp_drawable_get_sub_preview_async (GimpDrawable *drawable,
gint src_x,
gint src_y,
gint src_width,
gint src_height,
gint dest_width,
gint dest_height)
{
GimpItem *item;
GimpImage *image;
GeglBuffer *buffer;
SubPreviewData *data;
gdouble scale;
gint scaled_x;
gint scaled_y;
static gint no_async_drawable_previews = -1;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (src_x >= 0, NULL);
g_return_val_if_fail (src_y >= 0, NULL);
g_return_val_if_fail (src_width > 0, NULL);
g_return_val_if_fail (src_height > 0, NULL);
g_return_val_if_fail (dest_width > 0, NULL);
g_return_val_if_fail (dest_height > 0, NULL);
item = GIMP_ITEM (drawable);
g_return_val_if_fail ((src_x + src_width) <= gimp_item_get_width (item), NULL);
g_return_val_if_fail ((src_y + src_height) <= gimp_item_get_height (item), NULL);
image = gimp_item_get_image (item);
if (! image->gimp->config->layer_previews)
return NULL;
buffer = gimp_drawable_get_buffer_with_effects (drawable);
if (no_async_drawable_previews < 0)
{
no_async_drawable_previews =
(g_getenv ("GIMP_NO_ASYNC_DRAWABLE_PREVIEWS") != NULL);
}
if (no_async_drawable_previews)
{
GimpAsync *async = gimp_async_new ();
gimp_async_finish_full (async,
gimp_drawable_get_sub_preview (drawable,
src_x,
src_y,
src_width,
src_height,
dest_width,
dest_height),
(GDestroyNotify) gimp_temp_buf_unref);
return async;
}
scale = MIN ((gdouble) dest_width / (gdouble) src_width,
(gdouble) dest_height / (gdouble) src_height);
scaled_x = RINT ((gdouble) src_x * scale);
scaled_y = RINT ((gdouble) src_y * scale);
data = sub_preview_data_new (
gimp_drawable_get_preview_format (drawable),
buffer,
GEGL_RECTANGLE (scaled_x, scaled_y, dest_width, dest_height),
scale);
if (gimp_tile_handler_validate_get_assigned (buffer))
{
return gimp_idle_run_async_full (
GIMP_PRIORITY_VIEWABLE_IDLE,
(GimpRunAsyncFunc) gimp_drawable_get_sub_preview_async_func,
data,
(GDestroyNotify) sub_preview_data_free);
}
else
{
return gimp_parallel_run_async_full (
+1,
(GimpRunAsyncFunc) gimp_drawable_get_sub_preview_async_func,
data,
(GDestroyNotify) sub_preview_data_free);
}
}
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