mirror of https://github.com/GNOME/gimp.git
233 lines
7.8 KiB
C
233 lines
7.8 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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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 <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <gegl.h>
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#include "libgimpmath/gimpmath.h"
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#include "core-types.h"
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#include "base/pixel-region.h"
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#include "base/temp-buf.h"
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#include "base/tile-manager-preview.h"
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#include "paint-funcs/subsample-region.h"
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#include "config/gimpcoreconfig.h"
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#include "gimp.h"
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#include "gimpchannel.h"
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#include "gimpimage.h"
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#include "gimpdrawable-preview.h"
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#include "gimpdrawable-private.h"
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#include "gimplayer.h"
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#include "gimppreviewcache.h"
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/* local function prototypes */
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static TempBuf * gimp_drawable_preview_private (GimpDrawable *drawable,
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gint width,
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gint height);
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static TempBuf * gimp_drawable_indexed_preview (GimpDrawable *drawable,
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const guchar *cmap,
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gint src_x,
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gint src_y,
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gint src_width,
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gint src_height,
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gint dest_width,
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gint dest_height);
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/* public functions */
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TempBuf *
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gimp_drawable_get_preview (GimpViewable *viewable,
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GimpContext *context,
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gint width,
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gint height)
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{
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GimpDrawable *drawable;
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GimpImage *image;
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drawable = GIMP_DRAWABLE (viewable);
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image = gimp_item_get_image (GIMP_ITEM (drawable));
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if (! image->gimp->config->layer_previews)
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return NULL;
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/* Ok prime the cache with a large preview if the cache is invalid */
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if (! drawable->private->preview_valid &&
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width <= PREVIEW_CACHE_PRIME_WIDTH &&
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height <= PREVIEW_CACHE_PRIME_HEIGHT &&
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image &&
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gimp_image_get_width (image) > PREVIEW_CACHE_PRIME_WIDTH &&
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gimp_image_get_height (image) > PREVIEW_CACHE_PRIME_HEIGHT)
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{
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TempBuf *tb = gimp_drawable_preview_private (drawable,
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PREVIEW_CACHE_PRIME_WIDTH,
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PREVIEW_CACHE_PRIME_HEIGHT);
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/* Save the 2nd call */
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if (width == PREVIEW_CACHE_PRIME_WIDTH &&
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height == PREVIEW_CACHE_PRIME_HEIGHT)
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return tb;
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}
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/* Second call - should NOT visit the tile cache...*/
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return gimp_drawable_preview_private (drawable, width, height);
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}
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gint
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gimp_drawable_preview_bytes (GimpDrawable *drawable)
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{
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GimpImageBaseType base_type;
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gint bytes = 0;
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g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), 0);
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base_type = GIMP_IMAGE_TYPE_BASE_TYPE (gimp_drawable_type (drawable));
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switch (base_type)
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{
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case GIMP_RGB:
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case GIMP_GRAY:
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bytes = gimp_drawable_bytes (drawable);
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break;
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case GIMP_INDEXED:
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bytes = gimp_drawable_has_alpha (drawable) ? 4 : 3;
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break;
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}
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return bytes;
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}
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TempBuf *
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gimp_drawable_get_sub_preview (GimpDrawable *drawable,
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gint src_x,
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gint src_y,
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gint src_width,
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gint src_height,
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gint dest_width,
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gint dest_height)
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{
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GimpItem *item;
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GimpImage *image;
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g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
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g_return_val_if_fail (src_x >= 0, NULL);
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g_return_val_if_fail (src_y >= 0, NULL);
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g_return_val_if_fail (src_width > 0, NULL);
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g_return_val_if_fail (src_height > 0, NULL);
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g_return_val_if_fail (dest_width > 0, NULL);
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g_return_val_if_fail (dest_height > 0, NULL);
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item = GIMP_ITEM (drawable);
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g_return_val_if_fail ((src_x + src_width) <= gimp_item_get_width (item), NULL);
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g_return_val_if_fail ((src_y + src_height) <= gimp_item_get_height (item), NULL);
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image = gimp_item_get_image (item);
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if (! image->gimp->config->layer_previews)
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return NULL;
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if (GIMP_IMAGE_TYPE_BASE_TYPE (gimp_drawable_type (drawable)) == GIMP_INDEXED)
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return gimp_drawable_indexed_preview (drawable,
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gimp_drawable_get_colormap (drawable),
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src_x, src_y, src_width, src_height,
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dest_width, dest_height);
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return tile_manager_get_sub_preview (gimp_drawable_get_tiles (drawable),
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src_x, src_y, src_width, src_height,
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dest_width, dest_height);
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}
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/* private functions */
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static TempBuf *
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gimp_drawable_preview_private (GimpDrawable *drawable,
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gint width,
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gint height)
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{
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TempBuf *ret_buf;
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if (! drawable->private->preview_valid ||
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! (ret_buf = gimp_preview_cache_get (&drawable->private->preview_cache,
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width, height)))
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{
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GimpItem *item = GIMP_ITEM (drawable);
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ret_buf = gimp_drawable_get_sub_preview (drawable,
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0, 0,
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gimp_item_get_width (item),
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gimp_item_get_height (item),
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width,
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height);
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if (! drawable->private->preview_valid)
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gimp_preview_cache_invalidate (&drawable->private->preview_cache);
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drawable->private->preview_valid = TRUE;
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gimp_preview_cache_add (&drawable->private->preview_cache, ret_buf);
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}
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return ret_buf;
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}
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static TempBuf *
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gimp_drawable_indexed_preview (GimpDrawable *drawable,
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const guchar *cmap,
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gint src_x,
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gint src_y,
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gint src_width,
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gint src_height,
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gint dest_width,
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gint dest_height)
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{
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TempBuf *preview_buf;
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PixelRegion srcPR;
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PixelRegion destPR;
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gint bytes = gimp_drawable_preview_bytes (drawable);
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gint subsample = 1;
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/* calculate 'acceptable' subsample */
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while ((dest_width * (subsample + 1) * 2 < src_width) &&
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(dest_height * (subsample + 1) * 2 < src_width))
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subsample += 1;
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pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
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src_x, src_y, src_width, src_height,
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FALSE);
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preview_buf = temp_buf_new (dest_width, dest_height, bytes, 0, 0, NULL);
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pixel_region_init_temp_buf (&destPR, preview_buf,
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0, 0, dest_width, dest_height);
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subsample_indexed_region (&srcPR, &destPR, cmap, subsample);
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return preview_buf;
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}
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