258 lines
9.7 KiB
C
258 lines
9.7 KiB
C
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/* 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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* 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 "pika-gegl-types.h"
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#include "gegl/pika-gegl-mask.h"
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gboolean
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pika_gegl_mask_bounds (GeglBuffer *buffer,
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gint *x1,
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gint *y1,
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gint *x2,
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gint *y2)
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{
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GeglBufferIterator *iter;
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const GeglRectangle *extent;
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const GeglRectangle *roi;
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const Babl *format;
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gint bpp;
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gint tx1, tx2, ty1, ty2;
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g_return_val_if_fail (GEGL_IS_BUFFER (buffer), FALSE);
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g_return_val_if_fail (x1 != NULL, FALSE);
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g_return_val_if_fail (y1 != NULL, FALSE);
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g_return_val_if_fail (x2 != NULL, FALSE);
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g_return_val_if_fail (y2 != NULL, FALSE);
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extent = gegl_buffer_get_extent (buffer);
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/* go through and calculate the bounds */
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tx1 = extent->x + extent->width;
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ty1 = extent->y + extent->height;
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tx2 = extent->x;
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ty2 = extent->y;
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format = gegl_buffer_get_format (buffer);
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bpp = babl_format_get_bytes_per_pixel (format);
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iter = gegl_buffer_iterator_new (buffer, NULL, 0, format,
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GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 1);
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roi = &iter->items[0].roi;
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while (gegl_buffer_iterator_next (iter))
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{
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const guint8 *data_u8 = iter->items[0].data;
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gint ex = roi->x + roi->width;
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gint ey = roi->y + roi->height;
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/* only check the pixels if this tile is not fully within the
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* currently computed bounds
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*/
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if (roi->x < tx1 || ex > tx2 ||
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roi->y < ty1 || ey > ty2)
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{
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/* Check upper left and lower right corners to see if we can
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* avoid checking the rest of the pixels in this tile
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*/
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if (! gegl_memeq_zero (data_u8, bpp) &&
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! gegl_memeq_zero (data_u8 + (iter->length - 1) * bpp, bpp))
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{
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/* "ex/ey - 1" because the internal variables are the
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* right/bottom pixel of the mask's contents, not one
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* right/below it like the return values.
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*/
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if (roi->x < tx1) tx1 = roi->x;
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if (ex > tx2) tx2 = ex - 1;
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if (roi->y < ty1) ty1 = roi->y;
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if (ey > ty2) ty2 = ey - 1;
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}
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else
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{
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#define FIND_BOUNDS(bpp, type) \
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G_STMT_START \
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{ \
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const type *data; \
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gint y; \
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\
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if ((guintptr) data_u8 % bpp) \
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goto generic; \
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\
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data = (const type *) data_u8; \
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\
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for (y = roi->y; y < ey; y++) \
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{ \
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gint x1; \
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\
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for (x1 = 0; x1 < roi->width; x1++) \
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{ \
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if (data[x1]) \
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{ \
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gint x2; \
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gint x2_end = MAX (x1, tx2 - roi->x); \
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\
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for (x2 = roi->width - 1; x2 > x2_end; x2--) \
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{ \
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if (data[x2]) \
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break; \
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} \
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\
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x1 += roi->x; \
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x2 += roi->x; \
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\
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if (x1 < tx1) tx1 = x1; \
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if (x2 > tx2) tx2 = x2; \
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\
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if (y < ty1) ty1 = y; \
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if (y > ty2) ty2 = y; \
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\
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break; \
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} \
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} \
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\
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data += roi->width; \
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} \
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} \
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G_STMT_END
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switch (bpp)
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{
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case 1:
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FIND_BOUNDS (1, guint8);
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break;
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case 2:
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FIND_BOUNDS (2, guint16);
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break;
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case 4:
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FIND_BOUNDS (4, guint32);
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break;
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case 8:
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FIND_BOUNDS (8, guint64);
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break;
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default:
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generic:
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{
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const guint8 *data = data_u8;
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gint y;
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for (y = roi->y; y < ey; y++)
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{
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gint x1;
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for (x1 = 0; x1 < roi->width; x1++)
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{
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if (! gegl_memeq_zero (data + x1 * bpp, bpp))
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{
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gint x2;
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gint x2_end = MAX (x1, tx2 - roi->x);
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for (x2 = roi->width - 1; x2 > x2_end; x2--)
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{
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if (! gegl_memeq_zero (data + x2 * bpp,
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bpp))
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{
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break;
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}
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}
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x1 += roi->x;
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x2 += roi->x;
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if (x1 < tx1) tx1 = x1;
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if (x2 > tx2) tx2 = x2;
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if (y < ty1) ty1 = y;
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if (y > ty2) ty2 = y;
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}
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}
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data += roi->width * bpp;
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}
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}
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break;
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}
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#undef FIND_BOUNDS
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}
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}
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}
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tx2 = CLAMP (tx2 + 1, 0, gegl_buffer_get_width (buffer));
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ty2 = CLAMP (ty2 + 1, 0, gegl_buffer_get_height (buffer));
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if (tx1 == gegl_buffer_get_width (buffer) &&
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ty1 == gegl_buffer_get_height (buffer))
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{
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*x1 = 0;
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*y1 = 0;
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*x2 = gegl_buffer_get_width (buffer);
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*y2 = gegl_buffer_get_height (buffer);
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return FALSE;
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}
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*x1 = tx1;
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*y1 = ty1;
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*x2 = tx2;
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*y2 = ty2;
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return TRUE;
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}
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gboolean
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pika_gegl_mask_is_empty (GeglBuffer *buffer)
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{
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GeglBufferIterator *iter;
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const Babl *format;
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gint bpp;
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g_return_val_if_fail (GEGL_IS_BUFFER (buffer), FALSE);
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format = gegl_buffer_get_format (buffer);
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bpp = babl_format_get_bytes_per_pixel (format);
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iter = gegl_buffer_iterator_new (buffer, NULL, 0, format,
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GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 1);
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while (gegl_buffer_iterator_next (iter))
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{
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if (! gegl_memeq_zero (iter->items[0].data, bpp * iter->length))
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{
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gegl_buffer_iterator_stop (iter);
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return FALSE;
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}
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}
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return TRUE;
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}
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