mirror of https://github.com/GNOME/gimp.git
115 lines
4.1 KiB
C
115 lines
4.1 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 <glib-object.h>
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#include "base-types.h"
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#include "paint-funcs/subsample-region.h"
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#include "pixel-region.h"
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#include "temp-buf.h"
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#include "tile-manager.h"
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#include "tile-manager-preview.h"
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static TempBuf * tile_manager_create_preview (TileManager *tiles,
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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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TempBuf *
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tile_manager_get_preview (TileManager *tiles,
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gint width,
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gint height)
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{
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g_return_val_if_fail (tiles != NULL, NULL);
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g_return_val_if_fail (width > 0 && height > 0, NULL);
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return tile_manager_create_preview (tiles,
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0, 0,
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tile_manager_width (tiles),
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tile_manager_height (tiles),
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width, height);
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}
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TempBuf *
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tile_manager_get_sub_preview (TileManager *tiles,
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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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g_return_val_if_fail (tiles != NULL, NULL);
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g_return_val_if_fail (src_x >= 0 &&
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src_x < tile_manager_width (tiles), NULL);
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g_return_val_if_fail (src_y >= 0 &&
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src_y < tile_manager_height (tiles), NULL);
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g_return_val_if_fail (src_width > 0 &&
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src_x + src_width <= tile_manager_width (tiles), NULL);
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g_return_val_if_fail (src_height > 0 &&
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src_y + src_height <= tile_manager_height (tiles),
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NULL);
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g_return_val_if_fail (dest_width > 0 && dest_height > 0, NULL);
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return tile_manager_create_preview (tiles,
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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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static TempBuf *
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tile_manager_create_preview (TileManager *tiles,
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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;
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PixelRegion srcPR;
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PixelRegion destPR;
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gint subsample = 1;
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preview = temp_buf_new (dest_width, dest_height,
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tile_manager_bpp (tiles), 0, 0, NULL);
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pixel_region_init (&srcPR, tiles, src_x, src_y, src_width, src_height, FALSE);
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pixel_region_init_temp_buf (&destPR, preview, 0, 0, dest_width, dest_height);
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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_height))
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subsample += 1;
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subsample_region (&srcPR, &destPR, subsample);
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return preview;
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}
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